PiDP-8/I SoftwareCheck-in [fc1b9bc0e9]
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Overview
Comment:Updated SIMH to latest upstream. No functional change relative to prior source base as far as I can tell from the commit history since the last update.
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SHA3-256:  fc1b9bc0e9f18529a61c01a2eb205a332f4e46292e0eb37bce3972b663ce0b68
User & Date: tangent 2019-04-15 07:25:01
Context
2019-04-16
08:24
scanswitch was returning -1 on no GPIO, which is 255 on macOS at least, which means the test for "no GPIO" in bin/pid8pi wouldn't get hit properly. Returning 127 as that script expects rather than change the script, since the script has established a kind of contract. check-in: 07be964914 user: tangent tags: trunk
2019-04-15
07:33
Merged in the tiny trunk differences relative to the SIMH update accidentally checked in on this branch. Now this branch contains only the Python 2-ism fixes relative to trunk. check-in: 18d667556a user: tangent tags: os8-run-python3
07:25
Updated SIMH to latest upstream. No functional change relative to prior source base as far as I can tell from the commit history since the last update. check-in: fc1b9bc0e9 user: tangent tags: trunk
05:40
Updated bosi script to point at the Fossil 2.8 binary for RPi check-in: 5e51328bc2 user: tangent tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to ChangeLog.md.

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# PiDP-8/I Changes

<a id="201903xx"></a>
## Version 2019.03.xx — The "OS/8 V3F and os8-run" release

*   The banner feature in this release is that Bill Cattey transformed
    our `mkos8` tool into the `os8-run` script interpreter, giving us
    many new features and capabilities:

    *   The OS/8 V3D RK05 media build steps previously hard-coded in
        Python within `mkos8` are now in a series of scripts in the
................................................................................
        OS/8, but it could get stuck in other conditions, such as when
        running it under a freshly started simulator:

             $ bin/pdp8 boot/pep001.script

    *   Applied same high-bit improvement as for `hello.pal`.

*   Updated SIMH to commit ID 2f8fca49c6 (2019-01-23).  The only change
    of note to the PDP-8 simulator proper since our prior release is
    that devices now have description strings so that SIMH commands like
    `SHOW FEATURES` gives more descriptive output.

    The SIMH core mechanisms are much improved since the prior release.
    Major areas of improvement are:



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# PiDP-8/I Changes

<a id="201904xx"></a>
## Version 2019.04.xx — The "OS/8 V3F and os8-run" release

*   The banner feature in this release is that Bill Cattey transformed
    our `mkos8` tool into the `os8-run` script interpreter, giving us
    many new features and capabilities:

    *   The OS/8 V3D RK05 media build steps previously hard-coded in
        Python within `mkos8` are now in a series of scripts in the
................................................................................
        OS/8, but it could get stuck in other conditions, such as when
        running it under a freshly started simulator:

             $ bin/pdp8 boot/pep001.script

    *   Applied same high-bit improvement as for `hello.pal`.

*   Updated SIMH to commit ID 2f0db744 (2019-04-13).  The only change
    of note to the PDP-8 simulator proper since our prior release is
    that devices now have description strings so that SIMH commands like
    `SHOW FEATURES` gives more descriptive output.

    The SIMH core mechanisms are much improved since the prior release.
    Major areas of improvement are:

Changes to Makefile.in.

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#    the GNU make(1) file for building the PiDP-8/I software.
#
# If you are seeing this at the top of a file called Makefile and you
# intend to make edits, do that in Makefile.in.  Saying "make" will then
# re-build Makefile from that modified Makefile.in before proceeding to
# do the "make" operation.
#
# Copyright © 2015 by Oscar Vermeulen, © 2016-2018 by Warren Young
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
................................................................................
# shall not be used in advertising or otherwise to promote the sale,
# use or other dealings in this Software without prior written
# authorization from those authors.
########################################################################

# Git commit ID and time of the latest version of the SIMH 4 project on
# GitHub that has been merged into this source base.
SGCID=2f8fca49c6bfa4999d40a4adc50d6a2ad55464a3
SGCTM=2019-01-23T15:17:19-08:00

# C build flags for the PDP-8 simulator and its PiDP-8/I extensions.
SIM_CFLAGS := @CFLAGS@ @BUILDMODE@ \
	-Wno-unused-result -Wno-parentheses \
	-DUSE_READER_THREAD -DHAVE_DLOPEN=$(subst .,,@SH_SOEXT@) -DPIDP8I \
	-DSIM_ASYNCH_IO -DHAVE_REGEX_H -DHAVE_GLOB \
	-DSIM_GIT_COMMIT_ID=$(SGCID) -DSIM_GIT_COMMIT_TIME=$(SGCTM) \







|







 







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#    the GNU make(1) file for building the PiDP-8/I software.
#
# If you are seeing this at the top of a file called Makefile and you
# intend to make edits, do that in Makefile.in.  Saying "make" will then
# re-build Makefile from that modified Makefile.in before proceeding to
# do the "make" operation.
#
# Copyright © 2015 by Oscar Vermeulen, © 2016-2019 by Warren Young
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
................................................................................
# shall not be used in advertising or otherwise to promote the sale,
# use or other dealings in this Software without prior written
# authorization from those authors.
########################################################################

# Git commit ID and time of the latest version of the SIMH 4 project on
# GitHub that has been merged into this source base.
SGCID=2f0db74483bead32a9a6ef9c1606ba3162f63fc5
SGCTM=2019-04-13T12:49:43-07:00

# C build flags for the PDP-8 simulator and its PiDP-8/I extensions.
SIM_CFLAGS := @CFLAGS@ @BUILDMODE@ \
	-Wno-unused-result -Wno-parentheses \
	-DUSE_READER_THREAD -DHAVE_DLOPEN=$(subst .,,@SH_SOEXT@) -DPIDP8I \
	-DSIM_ASYNCH_IO -DHAVE_REGEX_H -DHAVE_GLOB \
	-DSIM_GIT_COMMIT_ID=$(SGCID) -DSIM_GIT_COMMIT_TIME=$(SGCTM) \

Changes to src/SIMH/PDP8/pdp8_dt.c.

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   (floating point) time, to allow save and restore of the start times.
*/

t_bool dt_setpos (UNIT *uptr)
{
uint32 new_time, ut, ulin, udelt;
int32 mot = DTS_GETMOT (uptr->STATE);
int32 unum, delta;

new_time = sim_grtime ();                               /* current time */
ut = new_time - uptr->LASTT;                            /* elapsed time */
if (ut == 0)                                            /* no time gone? exit */
    return FALSE;
uptr->LASTT = new_time;                                 /* update last time */
switch (mot & ~DTS_DIR) {                               /* case on motion */







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   (floating point) time, to allow save and restore of the start times.
*/

t_bool dt_setpos (UNIT *uptr)
{
uint32 new_time, ut, ulin, udelt;
int32 mot = DTS_GETMOT (uptr->STATE);
int32 unum, delta = 0;

new_time = sim_grtime ();                               /* current time */
ut = new_time - uptr->LASTT;                            /* elapsed time */
if (ut == 0)                                            /* no time gone? exit */
    return FALSE;
uptr->LASTT = new_time;                                 /* update last time */
switch (mot & ~DTS_DIR) {                               /* case on motion */

Changes to src/SIMH/scp.c.

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    t_addr low, t_addr high, DEVICE *dptr, UNIT *uptr);
t_stat ex_addr (FILE *ofile, int32 flag, t_addr addr, DEVICE *dptr, UNIT *uptr);
t_stat dep_addr (int32 flag, const char *cptr, t_addr addr, DEVICE *dptr,
    UNIT *uptr, int32 dfltinc);
void fprint_fields (FILE *stream, t_value before, t_value after, BITFIELD* bitdefs);
t_stat step_svc (UNIT *ptr);
t_stat expect_svc (UNIT *ptr);

t_stat shift_args (char *do_arg[], size_t arg_count);
t_stat set_on (int32 flag, CONST char *cptr);
t_stat set_verify (int32 flag, CONST char *cptr);
t_stat set_message (int32 flag, CONST char *cptr);
t_stat set_quiet (int32 flag, CONST char *cptr);
t_stat set_asynch (int32 flag, CONST char *cptr);
t_stat sim_show_asynch (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, CONST char *cptr);
................................................................................
    sim_int_step_description};

static const char *sim_int_expect_description (DEVICE *dptr)
{
return "Expect facility";
}


static UNIT sim_expect_unit = { UDATA (&expect_svc, 0, 0) };
DEVICE sim_expect_dev = {
    "INT-EXPECT", &sim_expect_unit, NULL, NULL, 
    1, 0, 0, 0, 0, 0, 
    NULL, NULL, NULL, NULL, NULL, NULL, 
    NULL, DEV_NOSAVE, 0, 
    NULL, NULL, NULL, NULL, NULL, NULL,
    sim_int_expect_description};















#if defined USE_INT64
static const char *sim_si64 = "64b data";
#else
static const char *sim_si64 = "32b data";
#endif
#if defined USE_ADDR64
................................................................................
         {"IERR",    "Internal error"},
         {"MTRLNT",  "Invalid magtape record length"},
         {"LOST",    "Console Telnet connection lost"},
         {"TTMO",    "Console Telnet connection timed out"},
         {"STALL",   "Console Telnet output stall"},
         {"AFAIL",   "Assertion failed"},
         {"INVREM",  "Invalid remote console command"},
         {"NOTATT",  "Not attached"},
         {"EXPECT",  "Expect matched"},
         {"AMBREG",  "Ambiguous register name"},
         {"REMOTE",  "remote console command"},
         {"INVEXPR", "invalid expression"},
    };

const size_t size_map[] = { sizeof (int8),
................................................................................
      " Console Telnet connection timed out\n"
      "5 STALL\n"
      " Console Telnet output stall\n"
      "5 AFAIL\n"
      " Assertion failed\n"
      "5 INVREM\n"
      " Invalid remote console command\n"
      "5 NOTATT\n"
      " Not attached \n"
      "5 AMBREG\n"
      " Ambiguous register\n"
#define HLP_SHIFT       "*Commands Executing_Command_Files SHIFT"
      "3SHIFT\n"
      "++shift                    shift the command file's positional parameters\n"
#define HLP_CALL        "*Commands Executing_Command_Files CALL"
      "3CALL\n"
................................................................................
      " than SCPE_STEP, SCPE_OK, and SCPE_EXIT.\n\n"
      " ON Traps can specify any of these status values:\n\n"
      "++NXM, UNATT, IOERR, CSUM, FMT, NOATT, OPENERR, MEM, ARG,\n"
      "++STEP, UNK, RO, INCOMP, STOP, TTIERR, TTOERR, EOF, REL,\n"
      "++NOPARAM, ALATT, TIMER, SIGERR, TTYERR, SUB, NOFNC, UDIS,\n"
      "++NORO, INVSW, MISVAL, 2FARG, 2MARG, NXDEV, NXUN, NXREG,\n"
      "++NXPAR, NEST, IERR, MTRLNT, LOST, TTMO, STALL, AFAIL,\n"
      "++NOTATT, AMBREG\n\n"
      " These values can be indicated by name or by their internal\n"
      " numeric value (not recommended).\n"
      /***************** 80 character line width template *************************/
      "3CONTROL-C Trapping\n"
      " A special ON trap is available to describe action(s) to be taken\n"
      " when CONTROL_C (aka SIGINT) occurs during the execution of\n"
      " simh commands and/or command procedures.\n\n"
................................................................................
      "5File Existence Expressions\n"
      " File existence can be determined with:\n\n"
      "++{NOT} EXIST \"<filespec>\"\n\n"
      "++{NOT} EXIST <filespec>\n\n"
      " Specifies a true (false {NOT}) condition if the file exists.\n"
      "5File Comparison Expressions\n"
      " Files can have their contents compared with:\n\n"
      "++-D {NOT} \"<filespec1>\" == \"<filespec2>\" \n\n"
      " Specifies a true (false {NOT}) condition if the indicated files\n"
      " have the same contents.\n\n"
       /***************** 80 character line width template *************************/
#define HLP_EXIT        "*Commands Exiting_The_Simulator"
      "2Exiting The Simulator\n"
      " EXIT (synonyms QUIT and BYE) returns control to the operating system.\n"
      "3 Exit Status\n"
................................................................................
    fprintf (stderr, "Fatal timer initialization error\n");
    read_line_p ("Hit Return to exit: ", cbuf, sizeof (cbuf) - 1, stdin);
    return EXIT_FAILURE;
    }
sim_register_internal_device (&sim_scp_dev);
sim_register_internal_device (&sim_expect_dev);
sim_register_internal_device (&sim_step_dev);


if ((stat = sim_ttinit ()) != SCPE_OK) {
    fprintf (stderr, "Fatal terminal initialization error\n%s\n",
        sim_error_text (stat));
    read_line_p ("Hit Return to exit: ", cbuf, sizeof (cbuf) - 1, stdin);
    return EXIT_FAILURE;
    }
................................................................................
setenv ("SIM_REGEX_TYPE", "PCREPOSIX", 1);              /* Publish regex type */
#elif defined (HAVE_REGEX_H)
setenv ("SIM_REGEX_TYPE", "REGEX", 1);                  /* Publish regex type */
#endif
if (*argv[0]) {                                         /* sim name arg? */
    char *np;                                           /* "path.ini" */

    strncpy (nbuf, argv[0], PATH_MAX + 1);              /* copy sim name */
    if ((np = (char *)match_ext (nbuf, "EXE")))         /* remove .exe */
        *np = 0;
    np = strrchr (nbuf, '/');                           /* stript path and try again in cwd */
    if (np == NULL)
        np = strrchr (nbuf, '\\');                      /* windows path separator */
    if (np == NULL)
        np = strrchr (nbuf, ']');                       /* VMS path separator */
................................................................................
if (SCPE_BARE_STATUS(stat) == SCPE_OPENERR)
    stat = do_cmd (-1, "simh.ini");                     /* simh.ini proc cmd file */
if (*cbuf)                                              /* cmd file arg? */
    stat = do_cmd (0, cbuf);                            /* proc cmd file */
else if (*argv[0]) {                                    /* sim name arg? */
    char *np;                                           /* "path.ini" */
    nbuf[0] = '"';                                      /* starting " */
    strncpy (nbuf + 1, argv[0], PATH_MAX + 1);          /* copy sim name */
    if ((np = (char *)match_ext (nbuf, "EXE")))         /* remove .exe */
        *np = 0;
    strlcat (nbuf, ".ini\"", sizeof (nbuf));            /* add .ini" */
    stat = do_cmd (-1, nbuf) & ~SCPE_NOMESSAGE;         /* proc default cmd file */
    if (stat == SCPE_OPENERR) {                         /* didn't exist/can't open? */
        np = strrchr (nbuf, '/');                       /* stript path and try again in cwd */
        if (np == NULL)
................................................................................
            stat = do_cmd (-1, np) & ~SCPE_NOMESSAGE;   /* proc default cmd file */
            }
        }
    }
if (SCPE_BARE_STATUS(stat) == SCPE_OPENERR)             /* didn't exist/can't open? */
    stat = SCPE_OK;

if (sim_switches & SWMASK ('T'))                        /* Command Line -T switch */
    stat = sim_library_unit_tests ();                   /* run library unit tests */

if (SCPE_BARE_STATUS(stat) != SCPE_EXIT)
    process_stdin_commands (SCPE_BARE_STATUS(stat), argv);

detach_all (0, TRUE);                                   /* close files */
sim_set_deboff (0, NULL);                               /* close debug */
................................................................................
        break;
    }
return SCPE_OK;
}

t_stat help_cmd (int32 flag, CONST char *cptr)
{
char gbuf[CBUFSIZE];
CTAB *cmdp;

GET_SWITCHES (cptr);                                    /* get switches */
if (sim_switches & SWMASK ('F'))
    flag = flag | SCP_HELP_FLAT;
if (*cptr) {
    cptr = get_glyph (cptr, gbuf, 0);
................................................................................

                    if ((shptr == NULL) || (shptr->help == NULL) || (*shptr->help == '\0'))
                        return SCPE_ARG;
                    return help_cmd_output (flag, shptr->help, NULL);
                    }
                return SCPE_ARG;
                }
            else
                return SCPE_2MARG;
            }
        if (cmdp->help) {
            if (strcmp (cmdp->name, "HELP") == 0) {
                DEVICE *dptr;
                int i;

                for (i = 0; (dptr = sim_devices[i]) != NULL; i++) {
................................................................................
                if (((cmdp->action == &exdep_cmd) || (0 == strcmp(cmdp->name, "BOOT"))) &&
                    sim_dflt_dev->help) {
                        sim_dflt_dev->help (stdout, sim_dflt_dev, sim_dflt_dev->units, 0, cmdp->name);
                        if (sim_log)
                            sim_dflt_dev->help (sim_log, sim_dflt_dev, sim_dflt_dev->units, 0, cmdp->name);
                    }
                }





            help_cmd_output (flag, cmdp->help, cmdp->help_base);
            }
        else { /* no help so it is likely a command alias */
            CTAB *cmdpa;

            for (cmdpa=cmd_table; cmdpa->name != NULL; cmdpa++)
                if ((cmdpa->action == cmdp->action) && (cmdpa->help)) {
                    sim_printf ("%s is an alias for the %s command:\n%s", 
................................................................................
                sim_printf ("No help available for the %s command\n", cmdp->name);
            }
        }
    else { 
        DEVICE *dptr;
        UNIT *uptr;
        t_stat r;


        if (0 == strcmp (gbuf, "DEVICE"))

            cptr = get_glyph (cptr, gbuf, 0);

        dptr = find_unit (gbuf, &uptr);
        if (dptr == NULL) {
            dptr = find_dev (gbuf);
            if (dptr == NULL)
                return SCPE_ARG;

            if (dptr->flags & DEV_DISABLE)
                sim_printf ("Device %s is currently disabled\n", dptr->name);
            }
        r = help_dev_help (stdout, dptr, uptr, flag, cptr);
        if (sim_log)
            help_dev_help (sim_log, dptr, uptr, flag | SCP_HELP_FLAT, cptr);
        return r;
................................................................................
   instr        =       input string
   tmpbuf       =       temp buffer
   maxstr       =       min (len (instr), len (tmpbuf))
   do_arg[10]   =       arguments

   Token "%0" represents the command file name.

   The input sequence "\%" represents a literal "%", and "\\" represents a
   literal "\".  All other character combinations are rendered literally.

   Omitted parameters result in null-string substitutions.
*/

void sim_sub_args (char *instr, size_t instr_size, char *do_arg[])
{
................................................................................
                                }
                            else
                                break;
                        }
                    ++ip;
                    }
                else {




                    get_glyph_nc (ip, gbuf, '%');           /* get the literal name */
                    ap = _sim_get_env_special (gbuf, rbuf, sizeof (rbuf));
                    ip += strlen (gbuf);
                    if (*ip == '%') 
                        ++ip;

                    }
                }
            if (ap) {                                   /* non-null arg? */
                char *expanded = NULL;

                if (expand_it) {
                    expanded = sim_filepath_parts (ap, parts);
................................................................................
size_t i;

for (i=1; i<arg_count-1; ++i)
    do_arg[i] = do_arg[i+1];
return SCPE_OK;
}

static
int sim_cmp_string (const char *s1, const char *s2)
{
long int v1, v2;
char *ep1, *ep2;

if (sim_switches & SWMASK ('F')) {      /* File Compare? */
    FILE *f1, *f2;
................................................................................
if (sim_switches & SWMASK ('P')) {
    CONST char *deflt = NULL;

    cptr = get_glyph_quoted (cptr, prompt, 0);          /* get prompt */
    if (prompt[0] == '\0')
        return sim_messagef (SCPE_2FARG, "Missing Prompt and Environment Variable Name\n");
    if ((prompt[0] == '"') || (prompt[0] == '\'')) {


        prompt[strlen (prompt) - 1] = '\0';
        memmove (prompt, prompt + 1, strlen (prompt));
        }
    deflt = get_glyph (cptr, varname, '=');             /* get environment variable name */


    if (deflt == NULL)
        deflt = "";
    if (*deflt) {
        strlcat (prompt, " [", sizeof (prompt));
        strlcat (prompt, deflt, sizeof (prompt));
        strlcat (prompt, "] ", sizeof (prompt));
        }
................................................................................
memset (&buf, 0, sizeof (buf));
if (cptr && (*cptr != 0))
    return SCPE_2MARG;
if (sim_clock_queue == QUEUE_LIST_END)
    fprintf (st, "%s event queue empty, time = %.0f, executing %s instructios/sec\n",
             sim_name, sim_time, sim_fmt_numeric (sim_timer_inst_per_sec ()));
else {
    const char *tim;


    fprintf (st, "%s event queue status, time = %.0f, executing %s instructions/sec\n",
             sim_name, sim_time, sim_fmt_numeric (sim_timer_inst_per_sec ()));
    accum = 0;
    for (uptr = sim_clock_queue; uptr != QUEUE_LIST_END; uptr = uptr->next) {
        if (uptr == &sim_step_unit)
            fprintf (st, "  Step timer");
        else
            if (uptr == &sim_expect_unit)
                fprintf (st, "  Expect fired");
................................................................................
                if ((dptr = find_dev_from_unit (uptr)) != NULL) {
                    fprintf (st, "  %s", sim_dname (dptr));
                    if (dptr->numunits > 1)
                        fprintf (st, " unit %d", (int32) (uptr - dptr->units));
                    }
                else
                    fprintf (st, "  Unknown");

        tim = sim_fmt_secs(((accum + uptr->time) / sim_timer_inst_per_sec ()) + (uptr->usecs_remaining / 1000000.0));
        if (uptr->usecs_remaining)
            fprintf (st, " at %d plus %.0f usecs%s%s%s%s\n", accum + uptr->time, uptr->usecs_remaining,
                                            (*tim) ? " (" : "", tim, (*tim) ? " total)" : "",
                                            (uptr->flags & UNIT_IDLE) ? " (Idle capable)" : "");
        else
            fprintf (st, " at %d%s%s%s%s\n", accum + uptr->time, 
                                            (*tim) ? " (" : "", tim, (*tim) ? ")" : "",
................................................................................
t_stat reason;

for (i = 0; i < start; i++) {
    if (sim_devices[i] == NULL)
        return SCPE_IERR;
    }
for (i = start; (dptr = sim_devices[i]) != NULL; i++) {
    if (sim_switches & SWMASK('P'))
        tmxr_add_debug (dptr);          /* Add TMXR debug to MUX devices */


    if (dptr->reset != NULL) {
        reason = dptr->reset (dptr);
        if (reason != SCPE_OK)
            return reason;
        }
    }
for (i = 0; sim_internal_device_count && (dptr = sim_internal_devices[i]); ++i) {
................................................................................
}

/* Attach unit to file */

t_stat attach_unit (UNIT *uptr, CONST char *cptr)
{
DEVICE *dptr;


if (!(uptr->flags & UNIT_ATTABLE))                      /* not attachable? */
    return SCPE_NOATT;
if ((dptr = find_dev_from_unit (uptr)) == NULL)
    return SCPE_NOATT;
uptr->filename = (char *) calloc (CBUFSIZE, sizeof (char)); /* alloc name buf */
if (uptr->filename == NULL)
................................................................................
                    return attach_err (uptr, SCPE_OPENERR); /* yes, error */
                uptr->fileref = sim_fopen (cptr, "wb+");/* open new file */
                if (uptr->fileref == NULL)              /* open fail? */
                    return attach_err (uptr, SCPE_OPENERR); /* yes, error */
                sim_messagef (SCPE_OK, "%s: creating new file\n", sim_dname (dptr));
                }
            }                                           /* end if null */


        }                                               /* end else */
    }
if (uptr->flags & UNIT_BUFABLE) {                       /* buffer? */
    uint32 cap = ((uint32) uptr->capac) / dptr->aincr;  /* effective size */
    if (uptr->flags & UNIT_MUSTBUF)                     /* dyn alloc? */
        uptr->filebuf = calloc (cap, SZ_D (dptr));      /* allocate */
    if (uptr->filebuf == NULL)                          /* no buffer? */
................................................................................
    sim_messagef (SCPE_OK, "%s: buffering file in memory\n", sim_dname (dptr));
    uptr->hwmark = (uint32)sim_fread (uptr->filebuf,    /* read file */
        SZ_D (dptr), cap, uptr->fileref);
    uptr->flags = uptr->flags | UNIT_BUF;               /* set buffered */
    }
uptr->flags = uptr->flags | UNIT_ATT;
uptr->pos = 0;






return SCPE_OK;
}

t_stat attach_err (UNIT *uptr, t_stat stat)
{
free (uptr->filename);
uptr->filename = NULL;
................................................................................
    return SCPE_IERR;
if (!(uptr->flags & UNIT_ATTABLE))                      /* attachable? */
    return SCPE_NOATT;
if (!(uptr->flags & UNIT_ATT)) {                        /* not attached? */
    if (sim_switches & SIM_SW_REST)                     /* restoring? */
        return SCPE_OK;                                 /* allow detach */
    else
        return SCPE_NOTATT;                             /* complain */
    }
if ((dptr = find_dev_from_unit (uptr)) == NULL)
    return SCPE_OK;
if ((uptr->flags & UNIT_BUF) && (uptr->filebuf)) {
    uint32 cap = (uptr->hwmark + dptr->aincr - 1) / dptr->aincr;
    if (uptr->hwmark && ((uptr->flags & UNIT_RO) == 0)) {
        sim_messagef (SCPE_OK, "%s: writing buffer to file\n", sim_dname (dptr));
................................................................................
        WRITE_I (uptr->u4);
        WRITE_I (uptr->u5);                             /* [V3.0] more unit */
        WRITE_I (uptr->u6);
        WRITE_I (uptr->flags);                          /* [V2.10] flags */
        WRITE_I (uptr->dynflags);
        WRITE_I (uptr->wait);
        WRITE_I (uptr->buf);

        WRITE_I (uptr->capac);                          /* [V3.5] capacity */
        fprintf (sfile, "%.0f\n", uptr->usecs_remaining);/* [V4.0] remaining wait */
        WRITE_I (uptr->pos);
        if (uptr->flags & UNIT_ATT) {
            fputs (uptr->filename, sfile);
            if ((uptr->flags & UNIT_BUF) &&             /* writable buffered */
                uptr->hwmark &&                         /* files need to be */
................................................................................
        READ_I (uptr->u5);                              /* [V3.0+] more dev spec */
        READ_I (uptr->u6);
        READ_I (flg);                                   /* [V2.10+] unit flags */
        if (v40) {                                      /* [V4.0+] dynflags */
            READ_I (uptr->dynflags);
            READ_I (uptr->wait);
            READ_I (uptr->buf);

            }
        old_capac = uptr->capac;                        /* save current capacity */
        if (v35) {                                      /* [V3.5+] capacity */
            READ_I (uptr->capac);
            }
        if (v40) {
            READ_S (buf);
................................................................................
free (attnames);
free (attunits);
free (attswitches);
if (warned)
    sim_printf ("restore with the -Q switch to suppress warning messages\n");
return r;
}









































/* Run, go, boot, cont, step, next commands

   ru[n] [new PC]       reset and start simulation
   go [new PC]          start simulation
   co[nt]               start simulation
   s[tep] [step limit]  start simulation for 'limit' instructions
................................................................................
    }
if (sim_step) {                                         /* set step timer */
    if (sim_switches & SWMASK ('T'))                    /* stepping for elapsed time? */
        sim_activate_after (&sim_step_unit, (uint32)sim_step);/* wall clock based step */
    else
        sim_activate (&sim_step_unit, sim_step);        /* instruction based step */
    }

stop_cpu = FALSE;
sim_is_running = TRUE;                                  /* flag running */
fflush(stdout);                                         /* flush stdout */
if (sim_log)                                            /* flush log if enabled */
    fflush (sim_log);
sim_throt_sched ();                                     /* set throttle */
sim_start_timer_services ();                            /* enable wall clock timing */
................................................................................
sim_stop_timer_services ();                             /* disable wall clock timing */
sim_ttcmd ();                                           /* restore console */
sim_brk_clrall (BRK_TYP_DYN_STEPOVER);                  /* cancel any step/over subroutine breakpoints */
#ifdef SIGHUP
signal (SIGHUP, SIG_DFL);                               /* cancel WRU */
#endif
signal (SIGTERM, SIG_DFL);                              /* cancel WRU */
if (sim_log)                                            /* flush console log */
    fflush (sim_log);
if (sim_deb)                                            /* flush debug log */
    _sim_debug_flush ();
for (i = 1; (dptr = sim_devices[i]) != NULL; i++) {     /* flush attached files */
    for (j = 0; j < dptr->numunits; j++) {              /* if not buffered in mem */
        uptr = dptr->units + j;
        if (uptr->flags & UNIT_ATT) {                   /* attached, */
            if (uptr->io_flush)                         /* unit specific flush routine */
                uptr->io_flush (uptr);                  /* call it */
            else {
                if (!(uptr->flags & UNIT_BUF) &&        /* not buffered, */
                    (uptr->fileref) &&                  /* real file, */
                    !(uptr->dynflags & UNIT_NO_FIO) &&  /* is FILE *, */
                    !(uptr->flags & UNIT_RO))           /* not read only? */
                    fflush (uptr->fileref);
                }
            }
        }
    }
sim_cancel (&sim_step_unit);                            /* cancel step timer */
sim_throt_cancel ();                                    /* cancel throttle */
AIO_UPDATE_QUEUE;
UPDATE_SIM_TIME;                                        /* update sim time */
return r | ((sim_switches & SWMASK ('Q')) ? SCPE_NOMESSAGE : 0);
}

................................................................................
            }
        else {
            if (sim_fseek (uptr->fileref, (t_addr)(sz * loc), SEEK_SET)) {
                clearerr (uptr->fileref);
                reason = SCPE_IOERR;
                break;
                }
            sim_fread (&sim_eval[i], sz, 1, uptr->fileref);
            if ((feof (uptr->fileref)) &&
               !(uptr->flags & UNIT_FIX)) {
                reason = SCPE_EOF;
                break;
                }
            else if (ferror (uptr->fileref)) {
                clearerr (uptr->fileref);
................................................................................
            reason = uptr->action (uptr);
        else
            reason = SCPE_OK;
        }
    AIO_EVENT_COMPLETE(uptr, reason);
    bare_reason = SCPE_BARE_STATUS (reason);
    if ((bare_reason != SCPE_OK)     &&  /* Provide context for unexpected errors */

        (bare_reason != SCPE_STOP)   && 
        (bare_reason != SCPE_STEP)   && 
        (bare_reason != SCPE_EXPECT) &&
        (bare_reason != SCPE_EXIT)   && 

        (bare_reason != SCPE_REMOTE))
        reason = sim_messagef (SCPE_IERR, "\nUnexpected internal error while processing event for %s which returned %d - %s\n", sim_uname (uptr), reason, sim_error_text (reason));
    } while ((reason == SCPE_OK) && 
             (sim_interval <= 0) && 
             (sim_clock_queue != QUEUE_LIST_END) &&
             (!stop_cpu));

if (sim_clock_queue == QUEUE_LIST_END) {                /* queue empty? */
    sim_interval = noqueue_time = NOQUEUE_WAIT;         /* flag queue empty */
................................................................................
                if (eidx) {
                    if (sim_isprint (ebcdic2ascii[data[i+sidx]]))
                        ebcdicbuf[eidx++] = ebcdic2ascii[data[i+sidx]];
                    else
                        ebcdicbuf[eidx++] = '.';
                    }
                }





            outbuf[oidx] = '\0';
            strbuf[soff+sidx] = '\0';
            ebcdicbuf[eidx] = '\0';
            rad50buf[ridx] = '\0';
            _sim_debug_unit (reason, uptr, "%04X%-48s %s%s%s\n", i, outbuf, strbuf, ebcdicbuf, rad50buf);
            }
        if (same > 0) {
................................................................................
    if (!cptr || !*cptr) {
        pstring = helpPrompt (topic, prompt[topic->kids != 0], FALSE);

        cptr = read_line_p (pstring, cbuf, sizeof (cbuf), stdin);
        free (pstring);
        }

    if (!cptr)                              /* EOF, exit help */



        break;


    cptr = get_glyph (cptr, gbuf, 0);
    if (!strcmp (gbuf, "*")) {              /* Wildcard */
        displayFlatHelp (st, dptr, uptr, flag, topic, ap);
        gbuf[0] = '\0';                     /* Displayed all subtopics, go up */
        }
    if (!gbuf[0]) {                         /* Blank, up a level */
................................................................................
{
if (this_Stack == NULL)
    return FALSE;

if (this_Stack->pointer == this_Stack->size) {  /* If necessary, grow stack */
    this_Stack->size += STACK_GROW_AMOUNT;
    this_Stack->elements = (Stack_Element *)realloc (this_Stack->elements, this_Stack->size * sizeof(*this_Stack->elements));
    memset (&this_Stack->elements[this_Stack->size - STACK_GROW_AMOUNT], 0, STACK_GROW_AMOUNT * sizeof(*this_Stack->elements));
    }

this_Stack->elements[this_Stack->pointer].op = op;
strlcpy (this_Stack->elements[this_Stack->pointer].data, data, sizeof (this_Stack->elements[this_Stack->pointer].data));
++this_Stack->pointer;

if (op)
................................................................................
    return cptr;
    }

*value = sim_eval_postfix (postfix, stat);
delete_Stack (postfix);
return cptr;
}































/*
 * Compiled in unit tests for the various device oriented library 
 * modules: sim_card, sim_disk, sim_tape, sim_ether, sim_tmxr, etc.
 */

static t_stat sim_library_unit_tests (void)
{
int i;
DEVICE *dptr;

t_stat stat = SCPE_OK;






for (i = 0; (dptr = sim_devices[i]) != NULL; i++) {



    switch (DEV_TYPE(dptr)) {
#if defined(USE_SIM_CARD)
        case DEV_CARD:
            stat = sim_card_test (dptr);
            break;
#endif
        case DEV_DISK:
            stat = sim_disk_test (dptr);
            break;
        case DEV_ETHER:
            stat = sim_ether_test (dptr);
            break;
        case DEV_TAPE:
            stat = sim_tape_test (dptr);
            break;
        default:
            break;
        }


    }
return stat;
}







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6739
6740
6741
6742
6743
6744
6745
6746
6747
6748
....
6932
6933
6934
6935
6936
6937
6938
6939
6940
6941
6942
6943
6944
6945
6946
....
6986
6987
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6989
6990
6991
6992
6993
6994
6995
6996
6997
6998
6999
7000
7001
....
7003
7004
7005
7006
7007
7008
7009
7010
7011
7012
7013
7014
7015
7016
7017
7018
7019
7020
7021
7022
....
7111
7112
7113
7114
7115
7116
7117
7118
7119
7120
7121
7122
7123
7124
7125
....
7330
7331
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7333
7334
7335
7336
7337
7338
7339
7340
7341
7342
7343
7344
....
7581
7582
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7589
7590
7591
7592
7593
7594
7595
....
7760
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7801
7802
7803
7804
7805
7806
7807
7808
7809
7810
7811
7812
7813
....
7991
7992
7993
7994
7995
7996
7997
7998
7999
8000
8001
8002
8003
8004
8005
....
8055
8056
8057
8058
8059
8060
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8062
8063


















8064
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8066
8067
8068
8069
8070
....
8759
8760
8761
8762
8763
8764
8765
8766
8767
8768
8769
8770
8771
8772
8773
.....
10758
10759
10760
10761
10762
10763
10764
10765
10766
10767
10768
10769
10770
10771
10772
10773
10774
10775
10776
10777
10778
10779
.....
12958
12959
12960
12961
12962
12963
12964
12965
12966
12967
12968
12969
12970
12971
12972
12973
12974
12975
12976
.....
13724
13725
13726
13727
13728
13729
13730
13731
13732
13733
13734
13735
13736
13737
13738
13739
13740
13741
13742
13743
.....
14034
14035
14036
14037
14038
14039
14040
14041
14042
14043
14044
14045
14046
14047
14048
.....
14583
14584
14585
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14596
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14598
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14660
14661
14662
14663
14664
    t_addr low, t_addr high, DEVICE *dptr, UNIT *uptr);
t_stat ex_addr (FILE *ofile, int32 flag, t_addr addr, DEVICE *dptr, UNIT *uptr);
t_stat dep_addr (int32 flag, const char *cptr, t_addr addr, DEVICE *dptr,
    UNIT *uptr, int32 dfltinc);
void fprint_fields (FILE *stream, t_value before, t_value after, BITFIELD* bitdefs);
t_stat step_svc (UNIT *ptr);
t_stat expect_svc (UNIT *ptr);
t_stat flush_svc (UNIT *ptr);
t_stat shift_args (char *do_arg[], size_t arg_count);
t_stat set_on (int32 flag, CONST char *cptr);
t_stat set_verify (int32 flag, CONST char *cptr);
t_stat set_message (int32 flag, CONST char *cptr);
t_stat set_quiet (int32 flag, CONST char *cptr);
t_stat set_asynch (int32 flag, CONST char *cptr);
t_stat sim_show_asynch (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, CONST char *cptr);
................................................................................
    sim_int_step_description};

static const char *sim_int_expect_description (DEVICE *dptr)
{
return "Expect facility";
}

#define FLUSH_INTERVAL 30*1000000           /* Flush I/O buffers every 30 seconds */
static UNIT sim_expect_unit = { UDATA (&expect_svc, 0, 0) };
DEVICE sim_expect_dev = {
    "INT-EXPECT", &sim_expect_unit, NULL, NULL, 
    1, 0, 0, 0, 0, 0, 
    NULL, NULL, NULL, NULL, NULL, NULL, 
    NULL, DEV_NOSAVE, 0, 
    NULL, NULL, NULL, NULL, NULL, NULL,
    sim_int_expect_description};

static const char *sim_int_flush_description (DEVICE *dptr)
{
return "Flush facility";
}

static UNIT sim_flush_unit = { UDATA (&flush_svc, UNIT_IDLE, 0) };
DEVICE sim_flush_dev = {
    "INT-FLUSH", &sim_flush_unit, NULL, NULL, 
    1, 0, 0, 0, 0, 0, 
    NULL, NULL, NULL, NULL, NULL, NULL, 
    NULL, DEV_NOSAVE, 0, 
    NULL, NULL, NULL, NULL, NULL, NULL,
    sim_int_flush_description};

#if defined USE_INT64
static const char *sim_si64 = "64b data";
#else
static const char *sim_si64 = "32b data";
#endif
#if defined USE_ADDR64
................................................................................
         {"IERR",    "Internal error"},
         {"MTRLNT",  "Invalid magtape record length"},
         {"LOST",    "Console Telnet connection lost"},
         {"TTMO",    "Console Telnet connection timed out"},
         {"STALL",   "Console Telnet output stall"},
         {"AFAIL",   "Assertion failed"},
         {"INVREM",  "Invalid remote console command"},

         {"EXPECT",  "Expect matched"},
         {"AMBREG",  "Ambiguous register name"},
         {"REMOTE",  "remote console command"},
         {"INVEXPR", "invalid expression"},
    };

const size_t size_map[] = { sizeof (int8),
................................................................................
      " Console Telnet connection timed out\n"
      "5 STALL\n"
      " Console Telnet output stall\n"
      "5 AFAIL\n"
      " Assertion failed\n"
      "5 INVREM\n"
      " Invalid remote console command\n"


      "5 AMBREG\n"
      " Ambiguous register\n"
#define HLP_SHIFT       "*Commands Executing_Command_Files SHIFT"
      "3SHIFT\n"
      "++shift                    shift the command file's positional parameters\n"
#define HLP_CALL        "*Commands Executing_Command_Files CALL"
      "3CALL\n"
................................................................................
      " than SCPE_STEP, SCPE_OK, and SCPE_EXIT.\n\n"
      " ON Traps can specify any of these status values:\n\n"
      "++NXM, UNATT, IOERR, CSUM, FMT, NOATT, OPENERR, MEM, ARG,\n"
      "++STEP, UNK, RO, INCOMP, STOP, TTIERR, TTOERR, EOF, REL,\n"
      "++NOPARAM, ALATT, TIMER, SIGERR, TTYERR, SUB, NOFNC, UDIS,\n"
      "++NORO, INVSW, MISVAL, 2FARG, 2MARG, NXDEV, NXUN, NXREG,\n"
      "++NXPAR, NEST, IERR, MTRLNT, LOST, TTMO, STALL, AFAIL,\n"
      "++AMBREG\n\n"
      " These values can be indicated by name or by their internal\n"
      " numeric value (not recommended).\n"
      /***************** 80 character line width template *************************/
      "3CONTROL-C Trapping\n"
      " A special ON trap is available to describe action(s) to be taken\n"
      " when CONTROL_C (aka SIGINT) occurs during the execution of\n"
      " simh commands and/or command procedures.\n\n"
................................................................................
      "5File Existence Expressions\n"
      " File existence can be determined with:\n\n"
      "++{NOT} EXIST \"<filespec>\"\n\n"
      "++{NOT} EXIST <filespec>\n\n"
      " Specifies a true (false {NOT}) condition if the file exists.\n"
      "5File Comparison Expressions\n"
      " Files can have their contents compared with:\n\n"
      "++-F {NOT} \"<filespec1>\" == \"<filespec2>\" \n\n"
      " Specifies a true (false {NOT}) condition if the indicated files\n"
      " have the same contents.\n\n"
       /***************** 80 character line width template *************************/
#define HLP_EXIT        "*Commands Exiting_The_Simulator"
      "2Exiting The Simulator\n"
      " EXIT (synonyms QUIT and BYE) returns control to the operating system.\n"
      "3 Exit Status\n"
................................................................................
    fprintf (stderr, "Fatal timer initialization error\n");
    read_line_p ("Hit Return to exit: ", cbuf, sizeof (cbuf) - 1, stdin);
    return EXIT_FAILURE;
    }
sim_register_internal_device (&sim_scp_dev);
sim_register_internal_device (&sim_expect_dev);
sim_register_internal_device (&sim_step_dev);
sim_register_internal_device (&sim_flush_dev);

if ((stat = sim_ttinit ()) != SCPE_OK) {
    fprintf (stderr, "Fatal terminal initialization error\n%s\n",
        sim_error_text (stat));
    read_line_p ("Hit Return to exit: ", cbuf, sizeof (cbuf) - 1, stdin);
    return EXIT_FAILURE;
    }
................................................................................
setenv ("SIM_REGEX_TYPE", "PCREPOSIX", 1);              /* Publish regex type */
#elif defined (HAVE_REGEX_H)
setenv ("SIM_REGEX_TYPE", "REGEX", 1);                  /* Publish regex type */
#endif
if (*argv[0]) {                                         /* sim name arg? */
    char *np;                                           /* "path.ini" */

    strlcpy (nbuf, argv[0], PATH_MAX + 2);              /* copy sim name */
    if ((np = (char *)match_ext (nbuf, "EXE")))         /* remove .exe */
        *np = 0;
    np = strrchr (nbuf, '/');                           /* stript path and try again in cwd */
    if (np == NULL)
        np = strrchr (nbuf, '\\');                      /* windows path separator */
    if (np == NULL)
        np = strrchr (nbuf, ']');                       /* VMS path separator */
................................................................................
if (SCPE_BARE_STATUS(stat) == SCPE_OPENERR)
    stat = do_cmd (-1, "simh.ini");                     /* simh.ini proc cmd file */
if (*cbuf)                                              /* cmd file arg? */
    stat = do_cmd (0, cbuf);                            /* proc cmd file */
else if (*argv[0]) {                                    /* sim name arg? */
    char *np;                                           /* "path.ini" */
    nbuf[0] = '"';                                      /* starting " */
    strlcpy (nbuf + 1, argv[0], PATH_MAX + 2);          /* copy sim name */
    if ((np = (char *)match_ext (nbuf, "EXE")))         /* remove .exe */
        *np = 0;
    strlcat (nbuf, ".ini\"", sizeof (nbuf));            /* add .ini" */
    stat = do_cmd (-1, nbuf) & ~SCPE_NOMESSAGE;         /* proc default cmd file */
    if (stat == SCPE_OPENERR) {                         /* didn't exist/can't open? */
        np = strrchr (nbuf, '/');                       /* stript path and try again in cwd */
        if (np == NULL)
................................................................................
            stat = do_cmd (-1, np) & ~SCPE_NOMESSAGE;   /* proc default cmd file */
            }
        }
    }
if (SCPE_BARE_STATUS(stat) == SCPE_OPENERR)             /* didn't exist/can't open? */
    stat = SCPE_OK;

if (sim_switches & SWMASK ('T'))                       /* Command Line -T switch */
    stat = sim_library_unit_tests ();                   /* run library unit tests */

if (SCPE_BARE_STATUS(stat) != SCPE_EXIT)
    process_stdin_commands (SCPE_BARE_STATUS(stat), argv);

detach_all (0, TRUE);                                   /* close files */
sim_set_deboff (0, NULL);                               /* close debug */
................................................................................
        break;
    }
return SCPE_OK;
}

t_stat help_cmd (int32 flag, CONST char *cptr)
{
char gbuf[CBUFSIZE], gbuf2[CBUFSIZE];
CTAB *cmdp;

GET_SWITCHES (cptr);                                    /* get switches */
if (sim_switches & SWMASK ('F'))
    flag = flag | SCP_HELP_FLAT;
if (*cptr) {
    cptr = get_glyph (cptr, gbuf, 0);
................................................................................

                    if ((shptr == NULL) || (shptr->help == NULL) || (*shptr->help == '\0'))
                        return SCPE_ARG;
                    return help_cmd_output (flag, shptr->help, NULL);
                    }
                return SCPE_ARG;
                }


            }
        if (cmdp->help) {
            if (strcmp (cmdp->name, "HELP") == 0) {
                DEVICE *dptr;
                int i;

                for (i = 0; (dptr = sim_devices[i]) != NULL; i++) {
................................................................................
                if (((cmdp->action == &exdep_cmd) || (0 == strcmp(cmdp->name, "BOOT"))) &&
                    sim_dflt_dev->help) {
                        sim_dflt_dev->help (stdout, sim_dflt_dev, sim_dflt_dev->units, 0, cmdp->name);
                        if (sim_log)
                            sim_dflt_dev->help (sim_log, sim_dflt_dev, sim_dflt_dev->units, 0, cmdp->name);
                    }
                }
            strlcpy (gbuf2, cmdp->help, sizeof (gbuf2));
            if (*cptr) {
                strlcat (gbuf2, " ", sizeof (gbuf2));
                strlcat (gbuf2, cptr, sizeof (gbuf2));
                }
            help_cmd_output (flag, gbuf2, cmdp->help_base);
            }
        else { /* no help so it is likely a command alias */
            CTAB *cmdpa;

            for (cmdpa=cmd_table; cmdpa->name != NULL; cmdpa++)
                if ((cmdpa->action == cmdp->action) && (cmdpa->help)) {
                    sim_printf ("%s is an alias for the %s command:\n%s", 
................................................................................
                sim_printf ("No help available for the %s command\n", cmdp->name);
            }
        }
    else { 
        DEVICE *dptr;
        UNIT *uptr;
        t_stat r;
        t_bool explicit_device = FALSE;

        if (0 == strcmp (gbuf, "DEVICE")) {
            explicit_device = TRUE;
            cptr = get_glyph (cptr, gbuf, 0);
            }
        dptr = find_unit (gbuf, &uptr);
        if (dptr == NULL) {
            dptr = find_dev (gbuf);
            if (dptr == NULL)
                return sim_messagef (SCPE_ARG, "No HELP available for %s%s %s\n", 
                                               explicit_device ? "DEVICE " : "", gbuf, cptr);
            if (dptr->flags & DEV_DISABLE)
                sim_printf ("Device %s is currently disabled\n", dptr->name);
            }
        r = help_dev_help (stdout, dptr, uptr, flag, cptr);
        if (sim_log)
            help_dev_help (sim_log, dptr, uptr, flag | SCP_HELP_FLAT, cptr);
        return r;
................................................................................
   instr        =       input string
   tmpbuf       =       temp buffer
   maxstr       =       min (len (instr), len (tmpbuf))
   do_arg[10]   =       arguments

   Token "%0" represents the command file name.

   The input sequence "%%" represents a literal "%", and "\\" represents a
   literal "\".  All other character combinations are rendered literally.

   Omitted parameters result in null-string substitutions.
*/

void sim_sub_args (char *instr, size_t instr_size, char *do_arg[])
{
................................................................................
                                }
                            else
                                break;
                        }
                    ++ip;
                    }
                else {
                    if (*ip == '\0') {                  /* is this a bare % at end of line? */
                        *op++ = '%';                    /* leave it there as a literal percent sign */
                        }
                    else {
                        get_glyph_nc (ip, gbuf, '%');   /* get the literal name */
                        ap = _sim_get_env_special (gbuf, rbuf, sizeof (rbuf));
                        ip += strlen (gbuf);
                        if (*ip == '%') 
                            ++ip;
                        }
                    }
                }
            if (ap) {                                   /* non-null arg? */
                char *expanded = NULL;

                if (expand_it) {
                    expanded = sim_filepath_parts (ap, parts);
................................................................................
size_t i;

for (i=1; i<arg_count-1; ++i)
    do_arg[i] = do_arg[i+1];
return SCPE_OK;
}


int sim_cmp_string (const char *s1, const char *s2)
{
long int v1, v2;
char *ep1, *ep2;

if (sim_switches & SWMASK ('F')) {      /* File Compare? */
    FILE *f1, *f2;
................................................................................
if (sim_switches & SWMASK ('P')) {
    CONST char *deflt = NULL;

    cptr = get_glyph_quoted (cptr, prompt, 0);          /* get prompt */
    if (prompt[0] == '\0')
        return sim_messagef (SCPE_2FARG, "Missing Prompt and Environment Variable Name\n");
    if ((prompt[0] == '"') || (prompt[0] == '\'')) {
        if (strlen (prompt) < 3)
            return sim_messagef (SCPE_ARG, "Invalid Prompt\n");
        prompt[strlen (prompt) - 1] = '\0';
        memmove (prompt, prompt + 1, strlen (prompt));
        }
    deflt = get_glyph (cptr, varname, '=');             /* get environment variable name */
    if (varname[0] == '\0')
        return sim_messagef (SCPE_2FARG, "Missing Environment Variable Name\n");
    if (deflt == NULL)
        deflt = "";
    if (*deflt) {
        strlcat (prompt, " [", sizeof (prompt));
        strlcat (prompt, deflt, sizeof (prompt));
        strlcat (prompt, "] ", sizeof (prompt));
        }
................................................................................
memset (&buf, 0, sizeof (buf));
if (cptr && (*cptr != 0))
    return SCPE_2MARG;
if (sim_clock_queue == QUEUE_LIST_END)
    fprintf (st, "%s event queue empty, time = %.0f, executing %s instructios/sec\n",
             sim_name, sim_time, sim_fmt_numeric (sim_timer_inst_per_sec ()));
else {
    const char *tim = "";
    double inst_per_sec = sim_timer_inst_per_sec ();

    fprintf (st, "%s event queue status, time = %.0f, executing %s instructions/sec\n",
             sim_name, sim_time, sim_fmt_numeric (inst_per_sec));
    accum = 0;
    for (uptr = sim_clock_queue; uptr != QUEUE_LIST_END; uptr = uptr->next) {
        if (uptr == &sim_step_unit)
            fprintf (st, "  Step timer");
        else
            if (uptr == &sim_expect_unit)
                fprintf (st, "  Expect fired");
................................................................................
                if ((dptr = find_dev_from_unit (uptr)) != NULL) {
                    fprintf (st, "  %s", sim_dname (dptr));
                    if (dptr->numunits > 1)
                        fprintf (st, " unit %d", (int32) (uptr - dptr->units));
                    }
                else
                    fprintf (st, "  Unknown");
        if (inst_per_sec != 0.0)
            tim = sim_fmt_secs(((accum + uptr->time) / sim_timer_inst_per_sec ()) + (uptr->usecs_remaining / 1000000.0));
        if (uptr->usecs_remaining)
            fprintf (st, " at %d plus %.0f usecs%s%s%s%s\n", accum + uptr->time, uptr->usecs_remaining,
                                            (*tim) ? " (" : "", tim, (*tim) ? " total)" : "",
                                            (uptr->flags & UNIT_IDLE) ? " (Idle capable)" : "");
        else
            fprintf (st, " at %d%s%s%s%s\n", accum + uptr->time, 
                                            (*tim) ? " (" : "", tim, (*tim) ? ")" : "",
................................................................................
t_stat reason;

for (i = 0; i < start; i++) {
    if (sim_devices[i] == NULL)
        return SCPE_IERR;
    }
for (i = start; (dptr = sim_devices[i]) != NULL; i++) {
    if (sim_switches & SWMASK('P')) {
        tmxr_add_debug (dptr);          /* Add TMXR debug to MUX devices */
        sim_tape_add_debug (dptr);      /* Add TAPE debug to TAPE devices */
        }
    if (dptr->reset != NULL) {
        reason = dptr->reset (dptr);
        if (reason != SCPE_OK)
            return reason;
        }
    }
for (i = 0; sim_internal_device_count && (dptr = sim_internal_devices[i]); ++i) {
................................................................................
}

/* Attach unit to file */

t_stat attach_unit (UNIT *uptr, CONST char *cptr)
{
DEVICE *dptr;
t_bool open_rw = FALSE;

if (!(uptr->flags & UNIT_ATTABLE))                      /* not attachable? */
    return SCPE_NOATT;
if ((dptr = find_dev_from_unit (uptr)) == NULL)
    return SCPE_NOATT;
uptr->filename = (char *) calloc (CBUFSIZE, sizeof (char)); /* alloc name buf */
if (uptr->filename == NULL)
................................................................................
                    return attach_err (uptr, SCPE_OPENERR); /* yes, error */
                uptr->fileref = sim_fopen (cptr, "wb+");/* open new file */
                if (uptr->fileref == NULL)              /* open fail? */
                    return attach_err (uptr, SCPE_OPENERR); /* yes, error */
                sim_messagef (SCPE_OK, "%s: creating new file\n", sim_dname (dptr));
                }
            }                                           /* end if null */
        else
            open_rw = TRUE;
        }                                               /* end else */
    }
if (uptr->flags & UNIT_BUFABLE) {                       /* buffer? */
    uint32 cap = ((uint32) uptr->capac) / dptr->aincr;  /* effective size */
    if (uptr->flags & UNIT_MUSTBUF)                     /* dyn alloc? */
        uptr->filebuf = calloc (cap, SZ_D (dptr));      /* allocate */
    if (uptr->filebuf == NULL)                          /* no buffer? */
................................................................................
    sim_messagef (SCPE_OK, "%s: buffering file in memory\n", sim_dname (dptr));
    uptr->hwmark = (uint32)sim_fread (uptr->filebuf,    /* read file */
        SZ_D (dptr), cap, uptr->fileref);
    uptr->flags = uptr->flags | UNIT_BUF;               /* set buffered */
    }
uptr->flags = uptr->flags | UNIT_ATT;
uptr->pos = 0;
if (open_rw &&                                      /* open for write in append mode? */
    (sim_switches & SWMASK ('A')) &&
    (uptr->flags & UNIT_SEQ) &&
    (!(uptr->flags & UNIT_MUSTBUF)) &&
    (0 == sim_fseek (uptr->fileref, 0, SEEK_END)))
    uptr->pos = (t_addr)sim_ftell (uptr->fileref);  /* Position at end of file */
return SCPE_OK;
}

t_stat attach_err (UNIT *uptr, t_stat stat)
{
free (uptr->filename);
uptr->filename = NULL;
................................................................................
    return SCPE_IERR;
if (!(uptr->flags & UNIT_ATTABLE))                      /* attachable? */
    return SCPE_NOATT;
if (!(uptr->flags & UNIT_ATT)) {                        /* not attached? */
    if (sim_switches & SIM_SW_REST)                     /* restoring? */
        return SCPE_OK;                                 /* allow detach */
    else
        return SCPE_UNATT;                              /* complain */
    }
if ((dptr = find_dev_from_unit (uptr)) == NULL)
    return SCPE_OK;
if ((uptr->flags & UNIT_BUF) && (uptr->filebuf)) {
    uint32 cap = (uptr->hwmark + dptr->aincr - 1) / dptr->aincr;
    if (uptr->hwmark && ((uptr->flags & UNIT_RO) == 0)) {
        sim_messagef (SCPE_OK, "%s: writing buffer to file\n", sim_dname (dptr));
................................................................................
        WRITE_I (uptr->u4);
        WRITE_I (uptr->u5);                             /* [V3.0] more unit */
        WRITE_I (uptr->u6);
        WRITE_I (uptr->flags);                          /* [V2.10] flags */
        WRITE_I (uptr->dynflags);
        WRITE_I (uptr->wait);
        WRITE_I (uptr->buf);
        WRITE_I (uptr->recsize);
        WRITE_I (uptr->capac);                          /* [V3.5] capacity */
        fprintf (sfile, "%.0f\n", uptr->usecs_remaining);/* [V4.0] remaining wait */
        WRITE_I (uptr->pos);
        if (uptr->flags & UNIT_ATT) {
            fputs (uptr->filename, sfile);
            if ((uptr->flags & UNIT_BUF) &&             /* writable buffered */
                uptr->hwmark &&                         /* files need to be */
................................................................................
        READ_I (uptr->u5);                              /* [V3.0+] more dev spec */
        READ_I (uptr->u6);
        READ_I (flg);                                   /* [V2.10+] unit flags */
        if (v40) {                                      /* [V4.0+] dynflags */
            READ_I (uptr->dynflags);
            READ_I (uptr->wait);
            READ_I (uptr->buf);
            READ_I (uptr->recsize);
            }
        old_capac = uptr->capac;                        /* save current capacity */
        if (v35) {                                      /* [V3.5+] capacity */
            READ_I (uptr->capac);
            }
        if (v40) {
            READ_S (buf);
................................................................................
free (attnames);
free (attunits);
free (attswitches);
if (warned)
    sim_printf ("restore with the -Q switch to suppress warning messages\n");
return r;
}

void sim_flush_buffered_files (void)
{
uint32 i, j;
DEVICE *dptr;
UNIT *uptr;

if (sim_log)                                            /* flush console log */
    fflush (sim_log);
if (sim_deb)                                            /* flush debug log */
    _sim_debug_flush ();
for (i = 1; (dptr = sim_devices[i]) != NULL; i++) {     /* flush attached files */
    for (j = 0; j < dptr->numunits; j++) {              /* if not buffered in mem */
        uptr = dptr->units + j;
        if (uptr->flags & UNIT_ATT) {                   /* attached, */
            if (uptr->io_flush) {                       /* unit specific flush routine? */
                if (!sim_asynch_enabled ||              /* and asynch I/O not possible? */
                    !sim_is_running)
                    uptr->io_flush (uptr);              /* call it */
                }
            else {
                if (!(uptr->flags & UNIT_BUF) &&        /* not buffered, */
                    (uptr->fileref) &&                  /* real file, */
                    !(uptr->dynflags & UNIT_NO_FIO) &&  /* is FILE *, */
                    !(uptr->flags & UNIT_RO))           /* not read only? */
                    fflush (uptr->fileref);
                }
            }
        }
    }
}

t_stat
flush_svc (UNIT *uptr)
{
sim_activate_after (uptr, FLUSH_INTERVAL);
sim_flush_buffered_files ();
return SCPE_OK;
}


/* Run, go, boot, cont, step, next commands

   ru[n] [new PC]       reset and start simulation
   go [new PC]          start simulation
   co[nt]               start simulation
   s[tep] [step limit]  start simulation for 'limit' instructions
................................................................................
    }
if (sim_step) {                                         /* set step timer */
    if (sim_switches & SWMASK ('T'))                    /* stepping for elapsed time? */
        sim_activate_after (&sim_step_unit, (uint32)sim_step);/* wall clock based step */
    else
        sim_activate (&sim_step_unit, sim_step);        /* instruction based step */
    }
sim_activate_after (&sim_flush_unit, FLUSH_INTERVAL);   /* Enable periodic buffer flushing */
stop_cpu = FALSE;
sim_is_running = TRUE;                                  /* flag running */
fflush(stdout);                                         /* flush stdout */
if (sim_log)                                            /* flush log if enabled */
    fflush (sim_log);
sim_throt_sched ();                                     /* set throttle */
sim_start_timer_services ();                            /* enable wall clock timing */
................................................................................
sim_stop_timer_services ();                             /* disable wall clock timing */
sim_ttcmd ();                                           /* restore console */
sim_brk_clrall (BRK_TYP_DYN_STEPOVER);                  /* cancel any step/over subroutine breakpoints */
#ifdef SIGHUP
signal (SIGHUP, SIG_DFL);                               /* cancel WRU */
#endif
signal (SIGTERM, SIG_DFL);                              /* cancel WRU */
sim_flush_buffered_files();
sim_cancel (&sim_flush_unit);                           /* cancel flush timer */


















sim_cancel (&sim_step_unit);                            /* cancel step timer */
sim_throt_cancel ();                                    /* cancel throttle */
AIO_UPDATE_QUEUE;
UPDATE_SIM_TIME;                                        /* update sim time */
return r | ((sim_switches & SWMASK ('Q')) ? SCPE_NOMESSAGE : 0);
}

................................................................................
            }
        else {
            if (sim_fseek (uptr->fileref, (t_addr)(sz * loc), SEEK_SET)) {
                clearerr (uptr->fileref);
                reason = SCPE_IOERR;
                break;
                }
            (void)sim_fread (&sim_eval[i], sz, 1, uptr->fileref);
            if ((feof (uptr->fileref)) &&
               !(uptr->flags & UNIT_FIX)) {
                reason = SCPE_EOF;
                break;
                }
            else if (ferror (uptr->fileref)) {
                clearerr (uptr->fileref);
................................................................................
            reason = uptr->action (uptr);
        else
            reason = SCPE_OK;
        }
    AIO_EVENT_COMPLETE(uptr, reason);
    bare_reason = SCPE_BARE_STATUS (reason);
    if ((bare_reason != SCPE_OK)     &&  /* Provide context for unexpected errors */
        (bare_reason >= SCPE_BASE)   &&
        (bare_reason != SCPE_EXPECT) &&
        (bare_reason != SCPE_REMOTE) &&
        (bare_reason != SCPE_MTRLNT) && 
        (bare_reason != SCPE_STOP)   && 
        (bare_reason != SCPE_STEP)   && 
        (bare_reason != SCPE_EXIT))
        sim_messagef (reason, "\nUnexpected internal error while processing event for %s which returned %d - %s\n", sim_uname (uptr), reason, sim_error_text (reason));
    } while ((reason == SCPE_OK) && 
             (sim_interval <= 0) && 
             (sim_clock_queue != QUEUE_LIST_END) &&
             (!stop_cpu));

if (sim_clock_queue == QUEUE_LIST_END) {                /* queue empty? */
    sim_interval = noqueue_time = NOQUEUE_WAIT;         /* flag queue empty */
................................................................................
                if (eidx) {
                    if (sim_isprint (ebcdic2ascii[data[i+sidx]]))
                        ebcdicbuf[eidx++] = ebcdic2ascii[data[i+sidx]];
                    else
                        ebcdicbuf[eidx++] = '.';
                    }
                }
            for (; sidx<16; ++sidx) {
                strbuf[soff+sidx] = ' ';
                if (eidx)
                    ebcdicbuf[eidx++] = ' ';
                }
            outbuf[oidx] = '\0';
            strbuf[soff+sidx] = '\0';
            ebcdicbuf[eidx] = '\0';
            rad50buf[ridx] = '\0';
            _sim_debug_unit (reason, uptr, "%04X%-48s %s%s%s\n", i, outbuf, strbuf, ebcdicbuf, rad50buf);
            }
        if (same > 0) {
................................................................................
    if (!cptr || !*cptr) {
        pstring = helpPrompt (topic, prompt[topic->kids != 0], FALSE);

        cptr = read_line_p (pstring, cbuf, sizeof (cbuf), stdin);
        free (pstring);
        }

    if (!cptr) {                            /* EOF, exit help */
#if !defined(_WIN32)
        printf ("\n");
#endif
        break;
        }

    cptr = get_glyph (cptr, gbuf, 0);
    if (!strcmp (gbuf, "*")) {              /* Wildcard */
        displayFlatHelp (st, dptr, uptr, flag, topic, ap);
        gbuf[0] = '\0';                     /* Displayed all subtopics, go up */
        }
    if (!gbuf[0]) {                         /* Blank, up a level */
................................................................................
{
if (this_Stack == NULL)
    return FALSE;

if (this_Stack->pointer == this_Stack->size) {  /* If necessary, grow stack */
    this_Stack->size += STACK_GROW_AMOUNT;
    this_Stack->elements = (Stack_Element *)realloc (this_Stack->elements, this_Stack->size * sizeof(*this_Stack->elements));
    memset (this_Stack->elements + this_Stack->size - STACK_GROW_AMOUNT, 0, STACK_GROW_AMOUNT * sizeof(*this_Stack->elements));
    }

this_Stack->elements[this_Stack->pointer].op = op;
strlcpy (this_Stack->elements[this_Stack->pointer].data, data, sizeof (this_Stack->elements[this_Stack->pointer].data));
++this_Stack->pointer;

if (op)
................................................................................
    return cptr;
    }

*value = sim_eval_postfix (postfix, stat);
delete_Stack (postfix);
return cptr;
}

/*
 * To avoid Coverity complaints about the use of rand() we define the function locally
 * This implementation of Lehmer's minimal standard algorithm is derived 
 * from the integer solution provided in:
 " "Communications of the ACM, October 1988, Volume 31, Number 10, page 1195"
 */

static int32 sim_rand_seed = 2;

void sim_srand (unsigned int seed)
{
/* Keep the seed within 1..RAND_MAX */
sim_rand_seed = (int32)(seed % RAND_MAX) + 1;
}

int sim_rand ()
{
const int32 a = 16807;
const int32 q = 127773;         /* (RAND_MAX + 1) / a */
const int32 r = 2836;           /* (RAND_MAX + 1) % a */
int32 lo, hi;

hi = sim_rand_seed / q;
lo = sim_rand_seed % q;
sim_rand_seed = a * lo - r * hi;
if (sim_rand_seed < 0)
    sim_rand_seed += RAND_MAX + 1;
return (sim_rand_seed - 1);
}

/*
 * Compiled in unit tests for the various device oriented library 
 * modules: sim_card, sim_disk, sim_tape, sim_ether, sim_tmxr, etc.
 */

static t_stat sim_library_unit_tests (void)
{
int i;
DEVICE *dptr;
int32 saved_switches = sim_switches & ~SWMASK ('T');
t_stat stat = SCPE_OK;

if (sim_switches & SWMASK ('D')) {
    sim_switches &= ~(SWMASK ('D') | SWMASK ('R') | SWMASK ('F') | SWMASK ('T'));
    sim_set_debon (0, "STDOUT");
    sim_switches = saved_switches;
    }
for (i = 0; (dptr = sim_devices[i]) != NULL; i++) {
    t_stat tstat = SCPE_OK;

    sim_switches = saved_switches;
    switch (DEV_TYPE(dptr)) {
#if defined(USE_SIM_CARD)
        case DEV_CARD:
            tstat = sim_card_test (dptr);
            break;
#endif
        case DEV_DISK:
            tstat = sim_disk_test (dptr);
            break;
        case DEV_ETHER:
            tstat = sim_ether_test (dptr);
            break;
        case DEV_TAPE:
            tstat = sim_tape_test (dptr);
            break;
        default:
            break;
        }
    if (tstat != SCPE_OK)
        stat = tstat;
    }
return stat;
}

Changes to src/SIMH/scp.h.

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#endif
#ifndef strncasecmp
#define strncasecmp(str1, str2, len) sim_strncasecmp((str1), (str2), (len))
#endif
#ifndef strcasecmp
#define strcasecmp(str1, str2) sim_strcasecmp ((str1), (str2))
#endif








CONST char *get_sim_opt (int32 opt, CONST char *cptr, t_stat *st);
CONST char *get_sim_sw (CONST char *cptr);
const char *put_switches (char *buf, size_t bufsize, uint32 sw);
CONST char *get_glyph (const char *iptr, char *optr, char mchar);
CONST char *get_glyph_nc (const char *iptr, char *optr, char mchar);
CONST char *get_glyph_quoted (const char *iptr, char *optr, char mchar);
CONST char *get_glyph_cmd (const char *iptr, char *optr);
................................................................................
t_stat sim_exp_set (EXPECT *exp, const char *match, int32 cnt, uint32 after, int32 switches, const char *act);
t_stat sim_exp_clr (EXPECT *exp, const char *match);
t_stat sim_exp_clrall (EXPECT *exp);
t_stat sim_exp_show (FILE *st, CONST EXPECT *exp, const char *match);
t_stat sim_exp_showall (FILE *st, const EXPECT *exp);
t_stat sim_exp_check (EXPECT *exp, uint8 data);
CONST char *match_ext (CONST char *fnam, const char *ext);

t_stat show_version (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, CONST char *cptr);
t_stat set_dev_debug (DEVICE *dptr, UNIT *uptr, int32 flag, CONST char *cptr);
t_stat show_dev_debug (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, CONST char *cptr);
t_stat sim_add_debug_flags (DEVICE *dptr, DEBTAB *debflags);
const char *sim_error_text (t_stat stat);
t_stat sim_string_to_stat (const char *cptr, t_stat *cond);
t_stat sim_cancel_step (void);
................................................................................
void sim_debug_unit (uint32 dbits, DEVICE* dptr, const char *fmt, ...) GCC_FMT_ATTR(3, 4);
#else
void _sim_debug_unit (uint32 dbits, UNIT *uptr, const char* fmt, ...) GCC_FMT_ATTR(3, 4);
void _sim_debug_device (uint32 dbits, DEVICE* dptr, const char* fmt, ...) GCC_FMT_ATTR(3, 4);
#define sim_debug(dbits, dptr, ...) do { if (sim_deb && dptr && ((dptr)->dctrl & (dbits))) _sim_debug_device (dbits, dptr, __VA_ARGS__);} while (0)
#define sim_debug_unit(dbits, uptr, ...) do { if (sim_deb && uptr && (((uptr)->dctrl | (uptr)->dptr->dctrl) & (dbits))) _sim_debug_unit (dbits, uptr, __VA_ARGS__);} while (0)
#endif


void fprint_stopped_gen (FILE *st, t_stat v, REG *pc, DEVICE *dptr);
#define SCP_HELP_FLAT   (1u << 31)       /* Force flat help when prompting is not possible */
#define SCP_HELP_ONECMD (1u << 30)       /* Display one topic, do not prompt */
#define SCP_HELP_ATTACH (1u << 29)       /* Top level topic is ATTACH help */
t_stat scp_help (FILE *st, DEVICE *dptr,
                 UNIT *uptr, int32 flag, const char *help, const char *cptr, ...);







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#endif
#ifndef strncasecmp
#define strncasecmp(str1, str2, len) sim_strncasecmp((str1), (str2), (len))
#endif
#ifndef strcasecmp
#define strcasecmp(str1, str2) sim_strcasecmp ((str1), (str2))
#endif
void sim_srand (unsigned int seed);
int sim_rand (void);
#ifdef RAND_MAX
#undef RAND_MAX
#endif
#define RAND_MAX 2147483646
#define rand sim_rand
#define srand(seed) sim_srand(seed)
CONST char *get_sim_opt (int32 opt, CONST char *cptr, t_stat *st);
CONST char *get_sim_sw (CONST char *cptr);
const char *put_switches (char *buf, size_t bufsize, uint32 sw);
CONST char *get_glyph (const char *iptr, char *optr, char mchar);
CONST char *get_glyph_nc (const char *iptr, char *optr, char mchar);
CONST char *get_glyph_quoted (const char *iptr, char *optr, char mchar);
CONST char *get_glyph_cmd (const char *iptr, char *optr);
................................................................................
t_stat sim_exp_set (EXPECT *exp, const char *match, int32 cnt, uint32 after, int32 switches, const char *act);
t_stat sim_exp_clr (EXPECT *exp, const char *match);
t_stat sim_exp_clrall (EXPECT *exp);
t_stat sim_exp_show (FILE *st, CONST EXPECT *exp, const char *match);
t_stat sim_exp_showall (FILE *st, const EXPECT *exp);
t_stat sim_exp_check (EXPECT *exp, uint8 data);
CONST char *match_ext (CONST char *fnam, const char *ext);
int sim_cmp_string (const char *s1, const char *s2);
t_stat show_version (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, CONST char *cptr);
t_stat set_dev_debug (DEVICE *dptr, UNIT *uptr, int32 flag, CONST char *cptr);
t_stat show_dev_debug (FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, CONST char *cptr);
t_stat sim_add_debug_flags (DEVICE *dptr, DEBTAB *debflags);
const char *sim_error_text (t_stat stat);
t_stat sim_string_to_stat (const char *cptr, t_stat *cond);
t_stat sim_cancel_step (void);
................................................................................
void sim_debug_unit (uint32 dbits, DEVICE* dptr, const char *fmt, ...) GCC_FMT_ATTR(3, 4);
#else
void _sim_debug_unit (uint32 dbits, UNIT *uptr, const char* fmt, ...) GCC_FMT_ATTR(3, 4);
void _sim_debug_device (uint32 dbits, DEVICE* dptr, const char* fmt, ...) GCC_FMT_ATTR(3, 4);
#define sim_debug(dbits, dptr, ...) do { if (sim_deb && dptr && ((dptr)->dctrl & (dbits))) _sim_debug_device (dbits, dptr, __VA_ARGS__);} while (0)
#define sim_debug_unit(dbits, uptr, ...) do { if (sim_deb && uptr && (((uptr)->dctrl | (uptr)->dptr->dctrl) & (dbits))) _sim_debug_unit (dbits, uptr, __VA_ARGS__);} while (0)
#endif
void sim_flush_buffered_files (void);

void fprint_stopped_gen (FILE *st, t_stat v, REG *pc, DEVICE *dptr);
#define SCP_HELP_FLAT   (1u << 31)       /* Force flat help when prompting is not possible */
#define SCP_HELP_ONECMD (1u << 30)       /* Display one topic, do not prompt */
#define SCP_HELP_ATTACH (1u << 29)       /* Top level topic is ATTACH help */
t_stat scp_help (FILE *st, DEVICE *dptr,
                 UNIT *uptr, int32 flag, const char *help, const char *cptr, ...);

Changes to src/SIMH/sim_console.c.

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c = tmxr_poll_conn (&sim_rem_con_tmxr);
if (c >= 0) {                                           /* poll connect */
    REMOTE *rem = &sim_rem_consoles[c];
    TMLN *lp = rem->lp;
    char wru_name[8];

    sim_activate_after(uptr+1, 1000000);                /* start data poll after 1 second */
    lp->rcve = 1;                                       /* rcv enabled */
    rem->buf_ptr = 0;                                   /* start with empty command buffer */
    rem->single_mode = TRUE;                            /* start in single command mode */
    rem->read_timeout = sim_rem_read_timeout;           /* Start with default timeout */
    if (isprint(sim_int_char&0xFF))
        sprintf(wru_name, "'%c'", sim_int_char&0xFF);
    else
................................................................................
{
char cbuf[4*CBUFSIZE];
REMOTE *rem = &sim_rem_consoles[(int)(lp - sim_rem_con_tmxr.ldsc)];
int line = rem->line;

if ((!sim_oline) && (sim_log)) {
    fflush (sim_log);
    sim_fseeko (sim_log, sim_rem_cmd_log_start, SEEK_SET);
    cbuf[sizeof(cbuf)-1] = '\0';
    while (fgets (cbuf, sizeof(cbuf)-1, sim_log))
        tmxr_linemsgf (lp, "%s", cbuf);
    }
sim_oline = NULL;
if ((rem->act == NULL) && 
    (!tmxr_input_pending_ln (lp))) {
................................................................................
            i = -1;
            continue;
            }
        else {
            sim_is_running = FALSE;
            sim_rem_collect_all_registers ();
            sim_stop_timer_services ();

            if (rem->act == NULL) {
                for (j=0; j < sim_rem_con_tmxr.lines; j++) {
                    TMLN *lpj = &sim_rem_con_tmxr.ldsc[j];
                    if ((i == j) || (!lpj->conn))
                        continue;
                    tmxr_linemsgf (lpj, "\nRemote Master Console(%s) Entering Commands\n", lp->ipad);
                    tmxr_send_buffered_data (lpj);     /* flush any buffered data */
................................................................................
            c = c & ~TMXR_VALID;
            if (rem->single_mode) {
                if (c == sim_int_char) {            /* ^E (the interrupt character) must start continue mode console interaction */
                    rem->single_mode = FALSE;       /* enter multi command mode */
                    sim_is_running = FALSE;
                    sim_rem_collect_all_registers ();
                    sim_stop_timer_services ();

                    stat = SCPE_STOP;
                    _sim_rem_message ("RUN", stat);
                    _sim_rem_log_out (lp);
                    for (j=0; j < sim_rem_con_tmxr.lines; j++) {
                        TMLN *lpj = &sim_rem_con_tmxr.ldsc[j];
                        if ((i == j) || (!lpj->conn))
                            continue;
................................................................................
if (sim_log)
    fprintf (st, "Logging enabled to \"%s\"\n", 
                 sim_logfile_name (sim_log, sim_log_ref));
else
    fprintf (st, "Logging disabled\n");
return SCPE_OK;
}
















/* Set debug routine */

t_stat sim_set_debon (int32 flag, CONST char *cptr)
{
char gbuf[CBUFSIZE];
t_stat r;
................................................................................
if (*cptr != 0)                                         /* now eol? */
    return SCPE_2MARG;
r = sim_open_logfile (gbuf, FALSE, &sim_deb, &sim_deb_ref);

if (r != SCPE_OK)
    return r;

sim_deb_switches = sim_switches & 
                   (SWMASK ('R') | SWMASK ('P') | 
                    SWMASK ('T') | SWMASK ('A') | 
                    SWMASK ('F') | SWMASK ('N') |
                    SWMASK ('B'));                  /* save debug switches */

if (sim_deb_switches & SWMASK ('R')) {
    struct tm loc_tm, gmt_tm;
    time_t time_t_now;

    clock_gettime(CLOCK_REALTIME, &sim_deb_basetime);
    time_t_now = (time_t)sim_deb_basetime.tv_sec;
    /* Adjust the relative timebase to reflect the localtime GMT offset */







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c = tmxr_poll_conn (&sim_rem_con_tmxr);
if (c >= 0) {                                           /* poll connect */
    REMOTE *rem = &sim_rem_consoles[c];
    TMLN *lp = rem->lp;
    char wru_name[8];

    sim_activate_after(rem_con_data_unit, 1000000);     /* start data poll after 1 second */
    lp->rcve = 1;                                       /* rcv enabled */
    rem->buf_ptr = 0;                                   /* start with empty command buffer */
    rem->single_mode = TRUE;                            /* start in single command mode */
    rem->read_timeout = sim_rem_read_timeout;           /* Start with default timeout */
    if (isprint(sim_int_char&0xFF))
        sprintf(wru_name, "'%c'", sim_int_char&0xFF);
    else
................................................................................
{
char cbuf[4*CBUFSIZE];
REMOTE *rem = &sim_rem_consoles[(int)(lp - sim_rem_con_tmxr.ldsc)];
int line = rem->line;

if ((!sim_oline) && (sim_log)) {
    fflush (sim_log);
    (void)sim_fseeko (sim_log, sim_rem_cmd_log_start, SEEK_SET);
    cbuf[sizeof(cbuf)-1] = '\0';
    while (fgets (cbuf, sizeof(cbuf)-1, sim_log))
        tmxr_linemsgf (lp, "%s", cbuf);
    }
sim_oline = NULL;
if ((rem->act == NULL) && 
    (!tmxr_input_pending_ln (lp))) {
................................................................................
            i = -1;
            continue;
            }
        else {
            sim_is_running = FALSE;
            sim_rem_collect_all_registers ();
            sim_stop_timer_services ();
            sim_flush_buffered_files ();
            if (rem->act == NULL) {
                for (j=0; j < sim_rem_con_tmxr.lines; j++) {
                    TMLN *lpj = &sim_rem_con_tmxr.ldsc[j];
                    if ((i == j) || (!lpj->conn))
                        continue;
                    tmxr_linemsgf (lpj, "\nRemote Master Console(%s) Entering Commands\n", lp->ipad);
                    tmxr_send_buffered_data (lpj);     /* flush any buffered data */
................................................................................
            c = c & ~TMXR_VALID;
            if (rem->single_mode) {
                if (c == sim_int_char) {            /* ^E (the interrupt character) must start continue mode console interaction */
                    rem->single_mode = FALSE;       /* enter multi command mode */
                    sim_is_running = FALSE;
                    sim_rem_collect_all_registers ();
                    sim_stop_timer_services ();
                    sim_flush_buffered_files ();
                    stat = SCPE_STOP;
                    _sim_rem_message ("RUN", stat);
                    _sim_rem_log_out (lp);
                    for (j=0; j < sim_rem_con_tmxr.lines; j++) {
                        TMLN *lpj = &sim_rem_con_tmxr.ldsc[j];
                        if ((i == j) || (!lpj->conn))
                            continue;
................................................................................
if (sim_log)
    fprintf (st, "Logging enabled to \"%s\"\n", 
                 sim_logfile_name (sim_log, sim_log_ref));
else
    fprintf (st, "Logging disabled\n");
return SCPE_OK;
}

/* Set debug switches */

int32 sim_set_deb_switches (int32 switches)
{
int32 old_deb_switches = sim_deb_switches;

sim_deb_switches = switches & 
                   (SWMASK ('R') | SWMASK ('P') | 
                    SWMASK ('T') | SWMASK ('A') | 
                    SWMASK ('F') | SWMASK ('N') |
                    SWMASK ('B') | SWMASK ('E') |
                    SWMASK ('D') );                 /* save debug switches */
return old_deb_switches;
}

/* Set debug routine */

t_stat sim_set_debon (int32 flag, CONST char *cptr)
{
char gbuf[CBUFSIZE];
t_stat r;
................................................................................
if (*cptr != 0)                                         /* now eol? */
    return SCPE_2MARG;
r = sim_open_logfile (gbuf, FALSE, &sim_deb, &sim_deb_ref);

if (r != SCPE_OK)
    return r;

sim_set_deb_switches (sim_switches);





if (sim_deb_switches & SWMASK ('R')) {
    struct tm loc_tm, gmt_tm;
    time_t time_t_now;

    clock_gettime(CLOCK_REALTIME, &sim_deb_basetime);
    time_t_now = (time_t)sim_deb_basetime.tv_sec;
    /* Adjust the relative timebase to reflect the localtime GMT offset */

Changes to src/SIMH/sim_console.h.

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t_stat sim_set_kmap (int32 flag, CONST char *cptr);
t_stat sim_set_telnet (int32 flag, CONST char *cptr);
t_stat sim_set_notelnet (int32 flag, CONST char *cptr);
t_stat sim_set_serial (int32 flag, CONST char *cptr);
t_stat sim_set_noserial (int32 flag, CONST char *cptr);
t_stat sim_set_logon (int32 flag, CONST char *cptr);
t_stat sim_set_logoff (int32 flag, CONST char *cptr);

t_stat sim_set_debon (int32 flag, CONST char *cptr);
t_stat sim_set_cons_debug (int32 flg, CONST char *cptr);
t_stat sim_set_cons_buff (int32 flg, CONST char *cptr);
t_stat sim_set_cons_unbuff (int32 flg, CONST char *cptr);
t_stat sim_set_cons_log (int32 flg, CONST char *cptr);
t_stat sim_set_cons_nolog (int32 flg, CONST char *cptr);
t_stat sim_set_deboff (int32 flag, CONST char *cptr);







>







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t_stat sim_set_kmap (int32 flag, CONST char *cptr);
t_stat sim_set_telnet (int32 flag, CONST char *cptr);
t_stat sim_set_notelnet (int32 flag, CONST char *cptr);
t_stat sim_set_serial (int32 flag, CONST char *cptr);
t_stat sim_set_noserial (int32 flag, CONST char *cptr);
t_stat sim_set_logon (int32 flag, CONST char *cptr);
t_stat sim_set_logoff (int32 flag, CONST char *cptr);
int32 sim_set_deb_switches (int32 switches);
t_stat sim_set_debon (int32 flag, CONST char *cptr);
t_stat sim_set_cons_debug (int32 flg, CONST char *cptr);
t_stat sim_set_cons_buff (int32 flg, CONST char *cptr);
t_stat sim_set_cons_unbuff (int32 flg, CONST char *cptr);
t_stat sim_set_cons_log (int32 flg, CONST char *cptr);
t_stat sim_set_cons_nolog (int32 flg, CONST char *cptr);
t_stat sim_set_deboff (int32 flag, CONST char *cptr);

Changes to src/SIMH/sim_defs.h.

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#define SCPE_IERR       (SCPE_BASE + 37)                /* internal error */
#define SCPE_MTRLNT     (SCPE_BASE + 38)                /* tape rec lnt error */
#define SCPE_LOST       (SCPE_BASE + 39)                /* Telnet conn lost */
#define SCPE_TTMO       (SCPE_BASE + 40)                /* Telnet conn timeout */
#define SCPE_STALL      (SCPE_BASE + 41)                /* Telnet conn stall */
#define SCPE_AFAIL      (SCPE_BASE + 42)                /* assert failed */
#define SCPE_INVREM     (SCPE_BASE + 43)                /* invalid remote console command */
#define SCPE_NOTATT     (SCPE_BASE + 44)                /* not attached */
#define SCPE_EXPECT     (SCPE_BASE + 45)                /* expect matched */
#define SCPE_AMBREG     (SCPE_BASE + 46)                /* ambiguous register */
#define SCPE_REMOTE     (SCPE_BASE + 47)                /* remote console command */
#define SCPE_INVEXPR    (SCPE_BASE + 48)                /* invalid expression */

#define SCPE_MAX_ERR    (SCPE_BASE + 48)                /* Maximum SCPE Error Value */
#define SCPE_KFLAG      0x10000000                      /* tti data flag */
#define SCPE_BREAK      0x20000000                      /* tti break flag */
#define SCPE_NOMESSAGE  0x40000000                      /* message display supression flag */
#define SCPE_BARE_STATUS(stat) ((stat) & ~(SCPE_NOMESSAGE|SCPE_KFLAG|SCPE_BREAK))

/* Print value format codes */

................................................................................
    int32               u5;                             /* device specific */
    int32               u6;                             /* device specific */
    void                *up7;                           /* device specific */
    void                *up8;                           /* device specific */
    uint16              us9;                            /* device specific */
    uint16              us10;                           /* device specific */
    void                *tmxr;                          /* TMXR linkage */

    t_bool              (*cancel)(UNIT *);
    double              usecs_remaining;                /* time balance for long delays */
    char                *uname;                         /* Unit name */
    DEVICE              *dptr;                          /* DEVICE linkage (backpointer) */
    uint32              dctrl;                          /* debug control */
#ifdef SIM_ASYNCH_IO
    void                (*a_check_completion)(UNIT *);
................................................................................
/* These flags are only set dynamically */

#define UNIT_ATTMULT    0000001         /* Allow multiple attach commands */
#define UNIT_TM_POLL    0000002         /* TMXR Polling unit */
#define UNIT_NO_FIO     0000004         /* fileref is NOT a FILE * */
#define UNIT_DISK_CHK   0000010         /* disk data debug checking (sim_disk) */
#define UNIT_TMR_UNIT   0000020         /* Unit registered as a calibrated timer */

#define UNIT_V_DF_TAPE  6               /* Bit offset for Tape Density reservation */
#define UNIT_S_DF_TAPE  3               /* Bits Reserved for Tape Density */

struct BITFIELD {
    const char      *name;                              /* field name */
    uint32          offset;                             /* starting bit */
    uint32          width;                              /* width */
    const char      **valuenames;                       /* map of values to strings */







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#define SCPE_IERR       (SCPE_BASE + 37)                /* internal error */
#define SCPE_MTRLNT     (SCPE_BASE + 38)                /* tape rec lnt error */
#define SCPE_LOST       (SCPE_BASE + 39)                /* Telnet conn lost */
#define SCPE_TTMO       (SCPE_BASE + 40)                /* Telnet conn timeout */
#define SCPE_STALL      (SCPE_BASE + 41)                /* Telnet conn stall */
#define SCPE_AFAIL      (SCPE_BASE + 42)                /* assert failed */
#define SCPE_INVREM     (SCPE_BASE + 43)                /* invalid remote console command */
#define SCPE_EXPECT     (SCPE_BASE + 44)                /* expect matched */

#define SCPE_AMBREG     (SCPE_BASE + 45)                /* ambiguous register */
#define SCPE_REMOTE     (SCPE_BASE + 46)                /* remote console command */
#define SCPE_INVEXPR    (SCPE_BASE + 47)                /* invalid expression */

#define SCPE_MAX_ERR    (SCPE_BASE + 47)                /* Maximum SCPE Error Value */
#define SCPE_KFLAG      0x10000000                      /* tti data flag */
#define SCPE_BREAK      0x20000000                      /* tti break flag */
#define SCPE_NOMESSAGE  0x40000000                      /* message display supression flag */
#define SCPE_BARE_STATUS(stat) ((stat) & ~(SCPE_NOMESSAGE|SCPE_KFLAG|SCPE_BREAK))

/* Print value format codes */

................................................................................
    int32               u5;                             /* device specific */
    int32               u6;                             /* device specific */
    void                *up7;                           /* device specific */
    void                *up8;                           /* device specific */
    uint16              us9;                            /* device specific */
    uint16              us10;                           /* device specific */
    void                *tmxr;                          /* TMXR linkage */
    uint32              recsize;                        /* Tape info */
    t_bool              (*cancel)(UNIT *);
    double              usecs_remaining;                /* time balance for long delays */
    char                *uname;                         /* Unit name */
    DEVICE              *dptr;                          /* DEVICE linkage (backpointer) */
    uint32              dctrl;                          /* debug control */
#ifdef SIM_ASYNCH_IO
    void                (*a_check_completion)(UNIT *);
................................................................................
/* These flags are only set dynamically */

#define UNIT_ATTMULT    0000001         /* Allow multiple attach commands */
#define UNIT_TM_POLL    0000002         /* TMXR Polling unit */
#define UNIT_NO_FIO     0000004         /* fileref is NOT a FILE * */
#define UNIT_DISK_CHK   0000010         /* disk data debug checking (sim_disk) */
#define UNIT_TMR_UNIT   0000020         /* Unit registered as a calibrated timer */
#define UNIT_TAPE_MRK   0000040         /* Tape Unit AWS Tapemark */
#define UNIT_V_DF_TAPE  7               /* Bit offset for Tape Density reservation */
#define UNIT_S_DF_TAPE  3               /* Bits Reserved for Tape Density */

struct BITFIELD {
    const char      *name;                              /* field name */
    uint32          offset;                             /* starting bit */
    uint32          width;                              /* width */
    const char      **valuenames;                       /* map of values to strings */

Changes to src/SIMH/sim_disk.c.

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            }
        free (copy_buf);
        sim_vhd_disk_close (vhd);
        sim_disk_detach (uptr);
        if (r == SCPE_OK) {
            created = TRUE;
            copied = TRUE;
            tbuf[sizeof(tbuf)-1] = '\0';
            strncpy (tbuf, gbuf, sizeof(tbuf)-1);
            cptr = tbuf;
            sim_disk_set_fmt (uptr, 0, "VHD", NULL);
            sim_switches = saved_sim_switches;
            }
        else
            return r;
        /* fall through and open/return the newly created & copied vhd */
................................................................................
    default:
        return SCPE_IERR;
    }
uptr->filename = (char *) calloc (CBUFSIZE, sizeof (char));/* alloc name buf */
uptr->disk_ctx = ctx = (struct disk_context *)calloc(1, sizeof(struct disk_context));
if ((uptr->filename == NULL) || (uptr->disk_ctx == NULL))
    return _err_return (uptr, SCPE_MEM);
strncpy (uptr->filename, cptr, CBUFSIZE);               /* save name */
ctx->sector_size = (uint32)sector_size;                 /* save sector_size */
ctx->capac_factor = ((dptr->dwidth / dptr->aincr) == 16) ? 2 : 1; /* save capacity units (word: 2, byte: 1) */
ctx->xfer_element_size = (uint32)xfer_element_size;     /* save xfer_element_size */
ctx->dptr = dptr;                                       /* save DEVICE pointer */
ctx->dbit = dbit;                                       /* save debug bit */
ctx->media_removed = 0;                                 /* default present */
sim_debug_unit (ctx->dbit, uptr, "sim_disk_attach(unit=%d,filename='%s')\n", (int)(uptr-ctx->dptr->units), uptr->filename);
................................................................................
t_stat sim_disk_detach (UNIT *uptr)
{
struct disk_context *ctx;
int (*close_function)(FILE *f);
FILE *fileref;
t_bool auto_format;



if ((uptr == NULL) || !(uptr->flags & UNIT_ATT))
    return SCPE_NOTATT;

ctx = (struct disk_context *)uptr->disk_ctx;
fileref = uptr->fileref;

sim_debug_unit (ctx->dbit, uptr, "sim_disk_detach(unit=%d,filename='%s')\n", (int)(uptr-ctx->dptr->units), uptr->filename);

switch (DK_GET_FMT (uptr)) {                            /* case on format */
................................................................................
                                      NULL,
                                      &ParentModificationTime,
                                      NULL,
                                      0)) {
                    if ((0 == memcmp (sDynamic->ParentUniqueID, sParentFooter.UniqueID, sizeof (sParentFooter.UniqueID))) &&
                        ((sDynamic->ParentTimeStamp == ParentModificationTime) ||
                         ((NtoHl(sDynamic->ParentTimeStamp)-NtoHl(ParentModificationTime)) == 3600) ||
                         (sim_switches & SWMASK ('O'))))

                         strncpy (szParentVHDPath, CheckPath, ParentVHDPathSize);

                    else {
                        if (0 != memcmp (sDynamic->ParentUniqueID, sParentFooter.UniqueID, sizeof (sParentFooter.UniqueID)))
                            sim_printf ("Error Invalid Parent VHD '%s' for Differencing VHD: %s\n", CheckPath, szVHDPath);
                        else
                            sim_printf ("Error Parent VHD '%s' has been modified since Differencing VHD: %s was created\n", CheckPath, szVHDPath);
                        Return = EINVAL;                /* File Corrupt/Invalid */
                        }
................................................................................
#else
char buffer[PATH_MAX];
char *wd = getcwd(buffer, PATH_MAX);

if ((szFileSpec[0] != '/') || (strchr (szFileSpec, ':')))
    snprintf (szFullFileSpecBuffer, BufferSize, "%s/%s", wd, szFileSpec);
else
    strncpy (szFullFileSpecBuffer, szFileSpec, BufferSize);
if ((c = strstr (szFullFileSpecBuffer, "]/")))
    memmove (c+1, c+2, strlen(c+2)+1);
memset (szFullFileSpecBuffer + strlen (szFullFileSpecBuffer), 0, BufferSize - strlen (szFullFileSpecBuffer));
#endif
}

static char *
HostPathToVhdPath (const char *szHostPath,
                   char *szVhdPath,
                   size_t VhdPathSize)
{
char *c, *d;


strncpy (szVhdPath, szHostPath, VhdPathSize-1);
if ((szVhdPath[1] == ':') && islower(szVhdPath[0]))
    szVhdPath[0] = toupper(szVhdPath[0]);
szVhdPath[VhdPathSize-1] = '\0';
if ((c = strrchr (szVhdPath, ']'))) {
    *c = '\0';
    if (!(d = strchr (szVhdPath, '[')))
        return d;







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            }
        free (copy_buf);
        sim_vhd_disk_close (vhd);
        sim_disk_detach (uptr);
        if (r == SCPE_OK) {
            created = TRUE;
            copied = TRUE;

            strlcpy (tbuf, gbuf, sizeof(tbuf)-1);
            cptr = tbuf;
            sim_disk_set_fmt (uptr, 0, "VHD", NULL);
            sim_switches = saved_sim_switches;
            }
        else
            return r;
        /* fall through and open/return the newly created & copied vhd */
................................................................................
    default:
        return SCPE_IERR;
    }
uptr->filename = (char *) calloc (CBUFSIZE, sizeof (char));/* alloc name buf */
uptr->disk_ctx = ctx = (struct disk_context *)calloc(1, sizeof(struct disk_context));
if ((uptr->filename == NULL) || (uptr->disk_ctx == NULL))
    return _err_return (uptr, SCPE_MEM);
strlcpy (uptr->filename, cptr, CBUFSIZE);               /* save name */
ctx->sector_size = (uint32)sector_size;                 /* save sector_size */
ctx->capac_factor = ((dptr->dwidth / dptr->aincr) == 16) ? 2 : 1; /* save capacity units (word: 2, byte: 1) */
ctx->xfer_element_size = (uint32)xfer_element_size;     /* save xfer_element_size */
ctx->dptr = dptr;                                       /* save DEVICE pointer */
ctx->dbit = dbit;                                       /* save debug bit */
ctx->media_removed = 0;                                 /* default present */
sim_debug_unit (ctx->dbit, uptr, "sim_disk_attach(unit=%d,filename='%s')\n", (int)(uptr-ctx->dptr->units), uptr->filename);
................................................................................
t_stat sim_disk_detach (UNIT *uptr)
{
struct disk_context *ctx;
int (*close_function)(FILE *f);
FILE *fileref;
t_bool auto_format;

if (uptr == NULL)
    return SCPE_IERR;
if (!(uptr->flags & UNIT_ATT))
    return SCPE_UNATT;

ctx = (struct disk_context *)uptr->disk_ctx;
fileref = uptr->fileref;

sim_debug_unit (ctx->dbit, uptr, "sim_disk_detach(unit=%d,filename='%s')\n", (int)(uptr-ctx->dptr->units), uptr->filename);

switch (DK_GET_FMT (uptr)) {                            /* case on format */
................................................................................
                                      NULL,
                                      &ParentModificationTime,
                                      NULL,
                                      0)) {
                    if ((0 == memcmp (sDynamic->ParentUniqueID, sParentFooter.UniqueID, sizeof (sParentFooter.UniqueID))) &&
                        ((sDynamic->ParentTimeStamp == ParentModificationTime) ||
                         ((NtoHl(sDynamic->ParentTimeStamp)-NtoHl(ParentModificationTime)) == 3600) ||
                         (sim_switches & SWMASK ('O')))) {
                         memset (szParentVHDPath, 0, ParentVHDPathSize);
                         strlcpy (szParentVHDPath, CheckPath, ParentVHDPathSize);
                        }
                    else {
                        if (0 != memcmp (sDynamic->ParentUniqueID, sParentFooter.UniqueID, sizeof (sParentFooter.UniqueID)))
                            sim_printf ("Error Invalid Parent VHD '%s' for Differencing VHD: %s\n", CheckPath, szVHDPath);
                        else
                            sim_printf ("Error Parent VHD '%s' has been modified since Differencing VHD: %s was created\n", CheckPath, szVHDPath);
                        Return = EINVAL;                /* File Corrupt/Invalid */
                        }
................................................................................
#else
char buffer[PATH_MAX];
char *wd = getcwd(buffer, PATH_MAX);

if ((szFileSpec[0] != '/') || (strchr (szFileSpec, ':')))
    snprintf (szFullFileSpecBuffer, BufferSize, "%s/%s", wd, szFileSpec);
else
    strlcpy (szFullFileSpecBuffer, szFileSpec, BufferSize);
if ((c = strstr (szFullFileSpecBuffer, "]/")))
    memmove (c+1, c+2, strlen(c+2)+1);
memset (szFullFileSpecBuffer + strlen (szFullFileSpecBuffer), 0, BufferSize - strlen (szFullFileSpecBuffer));
#endif
}

static char *
HostPathToVhdPath (const char *szHostPath,
                   char *szVhdPath,
                   size_t VhdPathSize)
{
char *c, *d;

memset (szVhdPath, 0, VhdPathSize);
strlcpy (szVhdPath, szHostPath, VhdPathSize-1);
if ((szVhdPath[1] == ':') && islower(szVhdPath[0]))
    szVhdPath[0] = toupper(szVhdPath[0]);
szVhdPath[VhdPathSize-1] = '\0';
if ((c = strrchr (szVhdPath, ']'))) {
    *c = '\0';
    if (!(d = strchr (szVhdPath, '[')))
        return d;

Changes to src/SIMH/sim_ether.c.

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  /* Allow generated MAC address */
  /* XX:XX:XX:XX:XX:XX{/bits{>file}} */
  /* bits (if specified) must be from 16 thru 48 */

  memset (&state, 0, sizeof(state));
  _eth_get_system_id (state.system_id, sizeof(state.system_id));
  strncpy (state.sim, sim_name, sizeof(state.sim));
  getcwd (state.cwd, sizeof(state.cwd));
  if (uptr)
    strncpy (state.uname, sim_uname (uptr), sizeof(state.uname)-1);
  cptr = strchr (strmac, '>');
  if (cptr) {
    state.file[sizeof(state.file)-1] = '\0';
    strncpy (state.file, cptr + 1, sizeof(state.file)-1);
    if ((f = fopen (state.file, "r"))) {
      filebuf[sizeof(filebuf)-1] = '\0';
      fgets (filebuf, sizeof(filebuf)-1, f);
      strmac = filebuf;
      fclose (f);
      strcpy (state.file, "");  /* avoid saving */
      }
................................................................................
    /* Set up interface flags */
    strcpy(ifr.ifr_name, devname);
    ifr.ifr_flags = IFF_TAP|IFF_NO_PI;

    /* Send interface requests to TUN/TAP driver. */
    if (ioctl(tun, TUNSETIFF, &ifr) >= 0) {
      if (ioctl(tun, FIONBIO, &on)) {
        strncpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE-1);
        close(tun);
        }
      else {
        *fd_handle = tun;
        strcpy(savname, ifr.ifr_name);
        }
      }
    else
      strncpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE-1);
    }
  else
    strncpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE-1);
#elif defined(HAVE_BSDTUNTAP) && defined(HAVE_TAP_NETWORK)
  if (1) {
    char dev_name[64] = "";

    snprintf(dev_name, sizeof(dev_name)-1, "/dev/%s", devname);
    dev_name[sizeof(dev_name)-1] = '\0';

    if ((tun = open(dev_name, O_RDWR)) >= 0) {
      if (ioctl(tun, FIONBIO, &on)) {
        strncpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE-1);
        close(tun);
        }
      else {
        *fd_handle = tun;
        strcpy(savname, devname);
        }
#if defined (__APPLE__)
      if (1) {
        struct ifreq ifr;
        int s;

        memset (&ifr, 0, sizeof(ifr));
        ifr.ifr_addr.sa_family = AF_INET;
        strncpy(ifr.ifr_name, savname, sizeof(ifr.ifr_name));
        if ((s = socket(AF_INET, SOCK_DGRAM, 0)) >= 0) {
          if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) >= 0) {
            ifr.ifr_flags |= IFF_UP;
            if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr)) {
              strncpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE-1);
              close(tun);
              }
            }
          close(s);
          }
        }
#endif
      }
    else
      strncpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE-1);
  }
#else
  strncpy(errbuf, "No support for tap: devices", PCAP_ERRBUF_SIZE-1);
#endif /* !defined(__linux) && !defined(HAVE_BSDTUNTAP) */
  if (0 == errbuf[0]) {
    *eth_api = ETH_API_TAP;
    *handle = (void *)1;  /* Flag used to indicated open */
    }
  }
else { /* !tap: */
................................................................................

      voa.port = (int)get_uint (vdeport_s, 10, 255, &r);
      if (r != SCPE_OK)
          return sim_messagef (SCPE_OPENERR, "Eth: Invalid vde port number: %s in %s\n", vdeport_s, savname);
      }

    if (!(*handle = (void*) vde_open((char *)vdeswitch_s, (char *)"simh", &voa)))
      strncpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE-1);
    else {
      *eth_api = ETH_API_VDE;
      *fd_handle = vde_datafd((VDECONN*)(*handle));
      }
#else
    strncpy(errbuf, "No support for vde: network devices", PCAP_ERRBUF_SIZE-1);
#endif /* defined(HAVE_VDE_NETWORK) */
    }
  else { /* !vde: */
    if (0 == strncmp("nat:", savname, 4)) {
#if defined(HAVE_SLIRP_NETWORK)
      const char *devname = savname + 4;

      while (isspace(*devname))
        ++devname;
      if (!(*handle = (void*) sim_slirp_open(devname, opaque, &_slirp_callback, dptr, dbit)))
        strncpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE-1);
      else {
        *eth_api = ETH_API_NAT;
        *fd_handle = 0;
        }
#else
      strncpy(errbuf, "No support for nat: network devices", PCAP_ERRBUF_SIZE-1);
#endif /* defined(HAVE_SLIRP_NETWORK) */
      }
    else { /* not nat: */
      if (0 == strncmp("udp:", savname, 4)) {
        char localport[CBUFSIZE], host[CBUFSIZE], port[CBUFSIZE];
        char hostport[2*CBUFSIZE];
        const char *devname = savname + 4;
................................................................................
           */
          int v = 1;
          ioctl(pcap_fileno(*handle), BIOCIMMEDIATE, &v);
          }
#endif /* defined (__APPLE__) */
#endif /* !defined (USE_READER_THREAD) */
#else
        strncpy (errbuf, "Unknown or unsupported network device", PCAP_ERRBUF_SIZE-1);
#endif /* defined(HAVE_PCAP_NETWORK) */
        } /* not udp:, so attempt to open the parameter as if it were an explicit device name */
      } /* !nat: */
    } /* !vde: */
  } /* !tap: */
if (errbuf[0])
  return SCPE_OPENERR;
................................................................................
  pthread_mutex_unlock (&dev->lock);  
  if ((status) && (routine))
    routine(0);
#endif

return status;
}





























































































t_stat eth_filter(ETH_DEV* dev, int addr_count, ETH_MAC* const addresses,
                  ETH_BOOL all_multicast, ETH_BOOL promiscuous)
{
return eth_filter_hash(dev, addr_count, addresses, 
                       all_multicast, promiscuous, 
                       NULL);
................................................................................
t_stat eth_filter_hash(ETH_DEV* dev, int addr_count, ETH_MAC* const addresses,
                       ETH_BOOL all_multicast, ETH_BOOL promiscuous, 
                       ETH_MULTIHASH* const hash)
{
int i;
char buf[116+66*ETH_FILTER_MAX];
char mac[20];
char* buf2;
t_stat status;
#ifdef USE_BPF
struct bpf_program bpf;
#endif

/* make sure device exists */
if (!dev) return SCPE_UNATT;
................................................................................
  if (dev->all_multicast) {
    sim_debug(dev->dbit, dev->dptr, "All Multicast\n");
    }
  if (dev->promiscuous) {
    sim_debug(dev->dbit, dev->dptr, "Promiscuous\n");
    }
  }

/* setup BPF filters and other fields to minimize packet delivery */
strcpy(buf, "");

/* construct destination filters - since the real ethernet interface was set
   into promiscuous mode by eth_open(), we need to filter out the packets that
   our simulated interface doesn't want. */
if (!dev->promiscuous) {
  for (i = 0; i < addr_count; i++) {
    eth_mac_fmt(&dev->filter_address[i], mac);
    if (!strstr(buf, mac))    /* eliminate duplicates */
      sprintf(&buf[strlen(buf)], "%s(ether dst %s)", (*buf) ? " or " : "((", mac);
    }
  if (dev->all_multicast || dev->hash_filter)
    sprintf(&buf[strlen(buf)], "%s(ether multicast)", (*buf) ? " or " : "((");
  if (strlen(buf) > 0)
    sprintf(&buf[strlen(buf)], ")");
  }

/* construct source filters - this prevents packets from being reflected back 
   by systems where WinPcap and libpcap cause packet reflections. Note that
   some systems do not reflect packets at all. This *assumes* that the 
   simulated NIC will not send out packets with multicast source fields. */
if ((addr_count > 0) && (dev->reflections > 0)) {
  if (strlen(buf) > 0)
    sprintf(&buf[strlen(buf)], " and ");
  sprintf (&buf[strlen(buf)], "not (");
  buf2 = &buf[strlen(buf)];
  for (i = 0; i < addr_count; i++) {
    if (dev->filter_address[i][0] & 0x01) continue; /* skip multicast addresses */
    eth_mac_fmt(&dev->filter_address[i], mac);
    if (!strstr(buf2, mac))   /* eliminate duplicates */
      sprintf(&buf2[strlen(buf2)], "%s(ether src %s)", (*buf2) ? " or " : "", mac);
    }
  sprintf (&buf[strlen(buf)], ")");
  if (1 == strlen(buf2)) {          /* all addresses were multicast? */
    buf[strlen(buf)-6] = '\0';      /* Remove "not ()" */
    if (strlen(buf) > 0)
        buf[strlen(buf)-5] = '\0';  /* remove " and " */
    }
  }
if (strlen(buf) > 0)
  sprintf(&buf[strlen(buf)], ")");
/* When changing the Physical Address on a LAN interface, VMS sends out a 
   loopback packet with the source and destination addresses set to the same 
   value as the Physical Address which is being setup.  This packet is
   designed to find and help diagnose MAC address conflicts (which also 
   include DECnet address conflicts). Normally, this packet would not be 
   seen by the sender, only by the other machine that has the same Physical 
   Address (or possibly DECnet address). If the ethernet subsystem is 
   reflecting packets, the network startup will fail to start if it sees the 
   reflected packet, since it thinks another system is using this Physical 
   Address (or DECnet address). We have to let these packets through, so 
   that if another machine has the same Physical Address (or DECnet address)
   that we can detect it. Both eth_write() and _eth_callback() help by 
   checking the reflection count - eth_write() adds the reflection count to
   dev->loopback_self_sent, and _eth_callback() check the value - if the
   dev->loopback_self_sent count is zero, then the packet has come from 
   another machine with the same address, and needs to be passed on to the 
   simulated machine. */

memset(dev->physical_addr, 0, sizeof(ETH_MAC));
dev->loopback_self_sent = 0;
/* check for physical address in filters */
if ((addr_count) && (dev->reflections > 0)) {
  for (i = 0; i < addr_count; i++) {
    if (dev->filter_address[i][0]&1)
      continue;  /* skip all multicast addresses */
    eth_mac_fmt(&dev->filter_address[i], mac);
    if (strcmp(mac, "00:00:00:00:00:00") != 0) {
      memcpy(dev->physical_addr, &dev->filter_address[i], sizeof(ETH_MAC));
      /* let packets through where dst and src are the same as our physical address */
      sprintf (&buf[strlen(buf)], " or ((ether dst %s) and (ether src %s))", mac, mac);
      if (dev->have_host_nic_phy_addr) {
        eth_mac_fmt(&dev->host_nic_phy_hw_addr, mac);
        sprintf(&buf[strlen(buf)], " or ((ether dst %s) and (ether proto 0x9000))", mac);
      }
      break;
      }
    }
  }
if ((0 == strlen(buf)) && (!dev->promiscuous)) /* Empty filter means match nothing */
  strcpy(buf, "ether host fe:ff:ff:ff:ff:ff"); /* this should be a good match nothing filter */
sim_debug(dev->dbit, dev->dptr, "BPF string is: |%s|\n", buf);







/* get netmask, which is a required argument for compiling.  The value, 
   in our case isn't actually interesting since the filters we generate 
   aren't referencing IP fields, networks or values */

#ifdef USE_BPF
if (dev->eth_api == ETH_API_PCAP) {
................................................................................
    bpf_netmask = 0;
  /* compile filter string */
  if ((status = pcap_compile((pcap_t*)dev->handle, &bpf, buf, 1, bpf_netmask)) < 0) {
    sprintf(errbuf, "%s", pcap_geterr((pcap_t*)dev->handle));
    sim_printf("Eth: pcap_compile error: %s\n", errbuf);
    /* show erroneous BPF string */
    sim_printf ("Eth: BPF string is: |%s|\n", buf);




















    }
  else {
    /* apply compiled filter string */
    if ((status = pcap_setfilter((pcap_t*)dev->handle, &bpf)) < 0) {
      sprintf(errbuf, "%s", pcap_geterr((pcap_t*)dev->handle));
      sim_printf("Eth: pcap_setfilter error: %s\n", errbuf);

      }
    else {
      /* Save BPF filter string */
      dev->bpf_filter = (char *)realloc(dev->bpf_filter, 1 + strlen(buf));
      strcpy (dev->bpf_filter, buf);
#ifdef USE_SETNONBLOCK
      /* set file non-blocking */
................................................................................
if (pcap_findalldevs(&alldevs, errbuf) == -1) {
  sim_printf ("Eth: error in pcap_findalldevs: %s\n", errbuf);
  }
else {
  /* copy device list into the passed structure */
  for (i=0, dev=alldevs; dev && (i < max); dev=dev->next, ++i) {
    if ((dev->flags & PCAP_IF_LOOPBACK) || (!strcmp("any", dev->name))) continue;
    strncpy(list[i].name, dev->name, sizeof(list[i].name)-1);
    if (dev->description)
      strncpy(list[i].desc, dev->description, sizeof(list[i].desc)-1);
    else
      strncpy(list[i].desc, "No description available", sizeof(list[i].desc)-1);
    }

  /* free device list */
  pcap_freealldevs(alldevs);
  }
#endif

................................................................................
  fprintf(st, "  BPF Filter: %s\n", dev->bpf_filter);
#if defined(HAVE_SLIRP_NETWORK)
if (dev->eth_api == ETH_API_NAT)
  sim_slirp_show ((SLIRP *)dev->handle, st);
#endif
}










































































































































































t_stat sim_ether_test (DEVICE *dptr)
{







return SCPE_OK;
}
#endif /* USE_NETWORK */







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2200
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....
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3756
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3801
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3808
3809
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3812
3813
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3817






3818
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3822
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  /* Allow generated MAC address */
  /* XX:XX:XX:XX:XX:XX{/bits{>file}} */
  /* bits (if specified) must be from 16 thru 48 */

  memset (&state, 0, sizeof(state));
  _eth_get_system_id (state.system_id, sizeof(state.system_id));
  strlcpy (state.sim, sim_name, sizeof(state.sim));
  getcwd (state.cwd, sizeof(state.cwd));
  if (uptr)
    strlcpy (state.uname, sim_uname (uptr), sizeof(state.uname));
  cptr = strchr (strmac, '>');
  if (cptr) {
    state.file[sizeof(state.file)-1] = '\0';
    strlcpy (state.file, cptr + 1, sizeof(state.file));
    if ((f = fopen (state.file, "r"))) {
      filebuf[sizeof(filebuf)-1] = '\0';
      fgets (filebuf, sizeof(filebuf)-1, f);
      strmac = filebuf;
      fclose (f);
      strcpy (state.file, "");  /* avoid saving */
      }
................................................................................
    /* Set up interface flags */
    strcpy(ifr.ifr_name, devname);
    ifr.ifr_flags = IFF_TAP|IFF_NO_PI;

    /* Send interface requests to TUN/TAP driver. */
    if (ioctl(tun, TUNSETIFF, &ifr) >= 0) {
      if (ioctl(tun, FIONBIO, &on)) {
        strlcpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE);
        close(tun);
        }
      else {
        *fd_handle = tun;
        strcpy(savname, ifr.ifr_name);
        }
      }
    else
      strlcpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE);
    }
  else
    strlcpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE);
#elif defined(HAVE_BSDTUNTAP) && defined(HAVE_TAP_NETWORK)
  if (1) {
    char dev_name[64] = "";

    snprintf(dev_name, sizeof(dev_name)-1, "/dev/%s", devname);
    dev_name[sizeof(dev_name)-1] = '\0';

    if ((tun = open(dev_name, O_RDWR)) >= 0) {
      if (ioctl(tun, FIONBIO, &on)) {
        strlcpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE);
        close(tun);
        }
      else {
        *fd_handle = tun;
        strcpy(savname, devname);
        }
#if defined (__APPLE__)
      if (1) {
        struct ifreq ifr;
        int s;

        memset (&ifr, 0, sizeof(ifr));
        ifr.ifr_addr.sa_family = AF_INET;
        strlcpy(ifr.ifr_name, savname, sizeof(ifr.ifr_name));
        if ((s = socket(AF_INET, SOCK_DGRAM, 0)) >= 0) {
          if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) >= 0) {
            ifr.ifr_flags |= IFF_UP;
            if (ioctl(s, SIOCSIFFLAGS, (caddr_t)&ifr)) {
              strlcpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE);
              close(tun);
              }
            }
          close(s);
          }
        }
#endif
      }
    else
      strlcpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE);
  }
#else
  strlcpy(errbuf, "No support for tap: devices", PCAP_ERRBUF_SIZE);
#endif /* !defined(__linux) && !defined(HAVE_BSDTUNTAP) */
  if (0 == errbuf[0]) {
    *eth_api = ETH_API_TAP;
    *handle = (void *)1;  /* Flag used to indicated open */
    }
  }
else { /* !tap: */
................................................................................

      voa.port = (int)get_uint (vdeport_s, 10, 255, &r);
      if (r != SCPE_OK)
          return sim_messagef (SCPE_OPENERR, "Eth: Invalid vde port number: %s in %s\n", vdeport_s, savname);
      }

    if (!(*handle = (void*) vde_open((char *)vdeswitch_s, (char *)"simh", &voa)))
      strlcpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE);
    else {
      *eth_api = ETH_API_VDE;
      *fd_handle = vde_datafd((VDECONN*)(*handle));
      }
#else
    strlcpy(errbuf, "No support for vde: network devices", PCAP_ERRBUF_SIZE);
#endif /* defined(HAVE_VDE_NETWORK) */
    }
  else { /* !vde: */
    if (0 == strncmp("nat:", savname, 4)) {
#if defined(HAVE_SLIRP_NETWORK)
      const char *devname = savname + 4;

      while (isspace(*devname))
        ++devname;
      if (!(*handle = (void*) sim_slirp_open(devname, opaque, &_slirp_callback, dptr, dbit)))
        strlcpy(errbuf, strerror(errno), PCAP_ERRBUF_SIZE);
      else {
        *eth_api = ETH_API_NAT;
        *fd_handle = 0;
        }
#else
      strlcpy(errbuf, "No support for nat: network devices", PCAP_ERRBUF_SIZE);
#endif /* defined(HAVE_SLIRP_NETWORK) */
      }
    else { /* not nat: */
      if (0 == strncmp("udp:", savname, 4)) {
        char localport[CBUFSIZE], host[CBUFSIZE], port[CBUFSIZE];
        char hostport[2*CBUFSIZE];
        const char *devname = savname + 4;
................................................................................
           */
          int v = 1;
          ioctl(pcap_fileno(*handle), BIOCIMMEDIATE, &v);
          }
#endif /* defined (__APPLE__) */
#endif /* !defined (USE_READER_THREAD) */
#else
        strlcpy (errbuf, "Unknown or unsupported network device", PCAP_ERRBUF_SIZE);
#endif /* defined(HAVE_PCAP_NETWORK) */
        } /* not udp:, so attempt to open the parameter as if it were an explicit device name */
      } /* !nat: */
    } /* !vde: */
  } /* !tap: */
if (errbuf[0])
  return SCPE_OPENERR;
................................................................................
  pthread_mutex_unlock (&dev->lock);  
  if ((status) && (routine))
    routine(0);
#endif

return status;
}

t_stat eth_bpf_filter (ETH_DEV* dev, int addr_count, ETH_MAC* const filter_address,
                       ETH_BOOL all_multicast, ETH_BOOL promiscuous, 
                       int reflections,
                       ETH_MAC* physical_addr,
                       ETH_MAC* host_nic_phy_hw_addr,
                       ETH_MULTIHASH* const hash,
                       char *buf)
{
int i;
char mac[20];
char *buf2;

/* setup BPF filters and other fields to minimize packet delivery */
strcpy(buf, "");

/* construct destination filters - since the real ethernet interface was set
   into promiscuous mode by eth_open(), we need to filter out the packets that
   our simulated interface doesn't want. */
if (!promiscuous) {
  for (i = 0; i < addr_count; i++) {
    eth_mac_fmt(&filter_address[i], mac);
    if (!strstr(buf, mac))    /* eliminate duplicates */
      sprintf(&buf[strlen(buf)], "%s(ether dst %s)", (*buf) ? " or " : "((", mac);
    }
  if (all_multicast || hash)
    sprintf(&buf[strlen(buf)], "%s(ether multicast)", (*buf) ? " or " : "((");
  if (strlen(buf) > 0)
    sprintf(&buf[strlen(buf)], ")");
  }

/* construct source filters - this prevents packets from being reflected back 
   by systems where WinPcap and libpcap cause packet reflections. Note that
   some systems do not reflect packets at all. This *assumes* that the 
   simulated NIC will not send out packets with multicast source fields. */
if ((addr_count > 0) && (reflections > 0)) {
  if (strlen(buf) > 0)
    sprintf(&buf[strlen(buf)], " and ");
  else
    if (promiscuous)
      sprintf(&buf[strlen(buf)], "(");
  sprintf (&buf[strlen(buf)], "not (");
  buf2 = &buf[strlen(buf)];
  for (i = 0; i < addr_count; i++) {
    if (filter_address[i][0] & 0x01) continue; /* skip multicast addresses */
    eth_mac_fmt(&filter_address[i], mac);
    if (!strstr(buf2, mac))   /* only process each address once */
      sprintf(&buf2[strlen(buf2)], "%s(ether src %s)", (*buf2) ? " or " : "", mac);
    }
  sprintf (&buf[strlen(buf)], ")");
  if (1 == strlen(buf2)) {          /* all addresses were multicast? */
    buf[strlen(buf)-6] = '\0';      /* Remove "not ()" */
    if (strlen(buf) > 0)
        buf[strlen(buf)-5] = '\0';  /* remove " and " */
    }
  }
if (strlen(buf) > 0)
  sprintf(&buf[strlen(buf)], ")");
/* When changing the Physical Address on a LAN interface, VMS sends out a 
   loopback packet with the source and destination addresses set to the same 
   value as the Physical Address which is being setup.  This packet is
   designed to find and help diagnose MAC address conflicts (which also 
   include DECnet address conflicts). Normally, this packet would not be 
   seen by the sender, only by the other machine that has the same Physical 
   Address (or possibly DECnet address). If the ethernet subsystem is 
   reflecting packets, the network startup will fail to start if it sees the 
   reflected packet, since it thinks another system is using this Physical 
   Address (or DECnet address). We have to let these packets through, so 
   that if another machine has the same Physical Address (or DECnet address)
   that we can detect it. Both eth_write() and _eth_callback() help by 
   checking the reflection count - eth_write() adds the reflection count to
   dev->loopback_self_sent, and _eth_callback() check the value - if the
   dev->loopback_self_sent count is zero, then the packet has come from 
   another machine with the same address, and needs to be passed on to the 
   simulated machine. */
/* check for physical address in filters */
if ((!promiscuous) && (addr_count) && (reflections > 0)) {
  eth_mac_fmt(&physical_addr[0], mac);
  if (strcmp(mac, "00:00:00:00:00:00") != 0) {
    /* let packets through where dst and src are the same as our physical address */
    sprintf (&buf[strlen(buf)], " or ((ether dst %s) and (ether src %s))", mac, mac);
    if (host_nic_phy_hw_addr) {
      eth_mac_fmt(&host_nic_phy_hw_addr[0], mac);
      sprintf(&buf[strlen(buf)], " or ((ether dst %s) and (ether proto 0x9000))", mac);
      }
    }
  }
if ((0 == strlen(buf)) && (!promiscuous)) /* Empty filter means match nothing */
  strcpy(buf, "ether host fe:ff:ff:ff:ff:ff"); /* this should be a good match nothing filter */
sim_debug(dev->dbit, dev->dptr, "BPF string is: |%s|\n", buf);
return SCPE_OK;
}

t_stat eth_filter(ETH_DEV* dev, int addr_count, ETH_MAC* const addresses,
                  ETH_BOOL all_multicast, ETH_BOOL promiscuous)
{
return eth_filter_hash(dev, addr_count, addresses, 
                       all_multicast, promiscuous, 
                       NULL);
................................................................................
t_stat eth_filter_hash(ETH_DEV* dev, int addr_count, ETH_MAC* const addresses,
                       ETH_BOOL all_multicast, ETH_BOOL promiscuous, 
                       ETH_MULTIHASH* const hash)
{
int i;
char buf[116+66*ETH_FILTER_MAX];
char mac[20];

t_stat status;
#ifdef USE_BPF
struct bpf_program bpf;
#endif

/* make sure device exists */
if (!dev) return SCPE_UNATT;
................................................................................
  if (dev->all_multicast) {
    sim_debug(dev->dbit, dev->dptr, "All Multicast\n");
    }
  if (dev->promiscuous) {
    sim_debug(dev->dbit, dev->dptr, "Promiscuous\n");
    }
  }




























































/* Set the desired physical address */
memset(dev->physical_addr, 0, sizeof(ETH_MAC));
dev->loopback_self_sent = 0;
/* Find desired physical address in filters */

for (i = 0; i < addr_count; i++) {
  if (dev->filter_address[i][0]&1)
    continue;  /* skip all multicast addresses */
  eth_mac_fmt(&dev->filter_address[i], mac);
  if (strcmp(mac, "00:00:00:00:00:00") != 0) {
    memcpy(dev->physical_addr, &dev->filter_address[i], sizeof(ETH_MAC));






    break;
    }
  }




/* setup BPF filters and other fields to minimize packet delivery */
eth_bpf_filter (dev, dev->addr_count, dev->filter_address, 
                dev->all_multicast, dev->promiscuous, 
                dev->reflections, &dev->physical_addr, 
                dev->have_host_nic_phy_addr ? &dev->host_nic_phy_hw_addr: NULL,
                &dev->hash, buf);

/* get netmask, which is a required argument for compiling.  The value, 
   in our case isn't actually interesting since the filters we generate 
   aren't referencing IP fields, networks or values */

#ifdef USE_BPF
if (dev->eth_api == ETH_API_PCAP) {
................................................................................
    bpf_netmask = 0;
  /* compile filter string */
  if ((status = pcap_compile((pcap_t*)dev->handle, &bpf, buf, 1, bpf_netmask)) < 0) {
    sprintf(errbuf, "%s", pcap_geterr((pcap_t*)dev->handle));
    sim_printf("Eth: pcap_compile error: %s\n", errbuf);
    /* show erroneous BPF string */
    sim_printf ("Eth: BPF string is: |%s|\n", buf);
    sim_printf ("Eth: Input to BPF string construction:\n");
    sim_printf ("Eth: Reflections: %d\n", dev->reflections);
    sim_printf ("Eth: Filter Set:\n");
    for (i = 0; i < addr_count; i++) {
      char mac[20];
      eth_mac_fmt(&dev->filter_address[i], mac);
      sim_printf ("Eth:   Addr[%d]: %s\n", i, mac);
      }
    if (dev->all_multicast)
      sim_printf ("Eth: All Multicast\n");
    if (dev->promiscuous)
      sim_printf ("Eth: Promiscuous\n");
    if (dev->hash_filter)
      sim_printf ("Eth: Multicast Hash: %02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X\n",
                  dev->hash[0], dev->hash[1], dev->hash[2], dev->hash[3], 
                  dev->hash[4], dev->hash[5], dev->hash[6], dev->hash[7]);
    if (dev->have_host_nic_phy_addr) {
      eth_mac_fmt(&dev->host_nic_phy_hw_addr, mac);
      sim_printf ("Eth: host_nic_phy_hw_addr: %s\n", mac);
      }
    }
  else {
    /* apply compiled filter string */
    if ((status = pcap_setfilter((pcap_t*)dev->handle, &bpf)) < 0) {
      sprintf(errbuf, "%s", pcap_geterr((pcap_t*)dev->handle));
      sim_printf("Eth: pcap_setfilter error: %s\n", errbuf);
      sim_printf ("Eth: BPF string is: |%s|\n", buf);
      }
    else {
      /* Save BPF filter string */
      dev->bpf_filter = (char *)realloc(dev->bpf_filter, 1 + strlen(buf));
      strcpy (dev->bpf_filter, buf);
#ifdef USE_SETNONBLOCK
      /* set file non-blocking */
................................................................................
if (pcap_findalldevs(&alldevs, errbuf) == -1) {
  sim_printf ("Eth: error in pcap_findalldevs: %s\n", errbuf);
  }
else {
  /* copy device list into the passed structure */
  for (i=0, dev=alldevs; dev && (i < max); dev=dev->next, ++i) {
    if ((dev->flags & PCAP_IF_LOOPBACK) || (!strcmp("any", dev->name))) continue;
    strlcpy(list[i].name, dev->name, sizeof(list[i].name));
    if (dev->description)
      strlcpy(list[i].desc, dev->description, sizeof(list[i].desc));
    else
      strlcpy(list[i].desc, "No description available", sizeof(list[i].desc));
    }

  /* free device list */
  pcap_freealldevs(alldevs);
  }
#endif

................................................................................
  fprintf(st, "  BPF Filter: %s\n", dev->bpf_filter);
#if defined(HAVE_SLIRP_NETWORK)
if (dev->eth_api == ETH_API_NAT)
  sim_slirp_show ((SLIRP *)dev->handle, st);
#endif
}

static
t_stat eth_test_crc32 (DEVICE *dptr)
{
int errors = 0;
int val;
uint8 data[12];
static uint32 valcrc32[] = {
  0x7BD5C66F, 0x92C4D707, 0x7286E2FE, 0x9B97F396, 0x69738F4D, 0x80629E25, 0x6020ABDC, 0x8931BAB4,
  0x5E99542B, 0xB7884543, 0x57CA70BA, 0xBEDB61D2, 0x4C3F1D09, 0xA52E0C61, 0x456C3998, 0xAC7D28F0,
  0x314CE2E7, 0xD85DF38F, 0x381FC676, 0xD10ED71E, 0x23EAABC5, 0xCAFBBAAD, 0x2AB98F54, 0xC3A89E3C,
  0x140070A3, 0xFD1161CB, 0x1D535432, 0xF442455A, 0x06A63981, 0xEFB728E9, 0x0FF51D10, 0xE6E40C78,
  0xEEE78F7F, 0x07F69E17, 0xE7B4ABEE, 0x0EA5BA86, 0xFC41C65D, 0x1550D735, 0xF512E2CC, 0x1C03F3A4,
  0xCBAB1D3B, 0x22BA0C53, 0xC2F839AA, 0x2BE928C2, 0xD90D5419, 0x301C4571, 0xD05E7088, 0x394F61E0,
  0xA47EABF7, 0x4D6FBA9F, 0xAD2D8F66, 0x443C9E0E, 0xB6D8E2D5, 0x5FC9F3BD, 0xBF8BC644, 0x569AD72C,
  0x813239B3, 0x682328DB, 0x88611D22, 0x61700C4A, 0x93947091, 0x7A8561F9, 0x9AC75400, 0x73D64568,
  0x8AC0520E, 0x63D14366, 0x8393769F, 0x6A8267F7, 0x98661B2C, 0x71770A44, 0x91353FBD, 0x78242ED5,
  0xAF8CC04A, 0x469DD122, 0xA6DFE4DB, 0x4FCEF5B3, 0xBD2A8968, 0x543B9800, 0xB479ADF9, 0x5D68BC91,
  0xC0597686, 0x294867EE, 0xC90A5217, 0x201B437F, 0xD2FF3FA4, 0x3BEE2ECC, 0xDBAC1B35, 0x32BD0A5D,
  0xE515E4C2, 0x0C04F5AA, 0xEC46C053, 0x0557D13B, 0xF7B3ADE0, 0x1EA2BC88, 0xFEE08971, 0x17F19819,
  0x1FF21B1E, 0xF6E30A76, 0x16A13F8F, 0xFFB02EE7, 0x0D54523C, 0xE4454354, 0x040776AD, 0xED1667C5,
  0x3ABE895A, 0xD3AF9832, 0x33EDADCB, 0xDAFCBCA3, 0x2818C078, 0xC109D110, 0x214BE4E9, 0xC85AF581,
  0x556B3F96, 0xBC7A2EFE, 0x5C381B07, 0xB5290A6F, 0x47CD76B4, 0xAEDC67DC, 0x4E9E5225, 0xA78F434D,
  0x7027ADD2, 0x9936BCBA, 0x79748943, 0x9065982B, 0x6281E4F0, 0x8B90F598, 0x6BD2C061, 0x82C3D109,
  0x428FE8EC, 0xAB9EF984, 0x4BDCCC7D, 0xA2CDDD15, 0x5029A1CE, 0xB938B0A6, 0x597A855F, 0xB06B9437,
  0x67C37AA8, 0x8ED26BC0, 0x6E905E39, 0x87814F51, 0x7565338A, 0x9C7422E2, 0x7C36171B, 0x95270673,
  0x0816CC64, 0xE107DD0C, 0x0145E8F5, 0xE854F99D, 0x1AB08546, 0xF3A1942E, 0x13E3A1D7, 0xFAF2B0BF,
  0x2D5A5E20, 0xC44B4F48, 0x24097AB1, 0xCD186BD9, 0x3FFC1702, 0xD6ED066A, 0x36AF3393, 0xDFBE22FB,
  0xD7BDA1FC, 0x3EACB094, 0xDEEE856D, 0x37FF9405, 0xC51BE8DE, 0x2C0AF9B6, 0xCC48CC4F, 0x2559DD27,
  0xF2F133B8, 0x1BE022D0, 0xFBA21729, 0x12B30641, 0xE0577A9A, 0x09466BF2, 0xE9045E0B, 0x00154F63,
  0x9D248574, 0x7435941C, 0x9477A1E5, 0x7D66B08D, 0x8F82CC56, 0x6693DD3E, 0x86D1E8C7, 0x6FC0F9AF,
  0xB8681730, 0x51790658, 0xB13B33A1, 0x582A22C9, 0xAACE5E12, 0x43DF4F7A, 0xA39D7A83, 0x4A8C6BEB,
  0xB39A7C8D, 0x5A8B6DE5, 0xBAC9581C, 0x53D84974, 0xA13C35AF, 0x482D24C7, 0xA86F113E, 0x417E0056,
  0x96D6EEC9, 0x7FC7FFA1, 0x9F85CA58, 0x7694DB30, 0x8470A7EB, 0x6D61B683, 0x8D23837A, 0x64329212,
  0xF9035805, 0x1012496D, 0xF0507C94, 0x19416DFC, 0xEBA51127, 0x02B4004F, 0xE2F635B6, 0x0BE724DE,
  0xDC4FCA41, 0x355EDB29, 0xD51CEED0, 0x3C0DFFB8, 0xCEE98363, 0x27F8920B, 0xC7BAA7F2, 0x2EABB69A,
  0x26A8359D, 0xCFB924F5, 0x2FFB110C, 0xC6EA0064, 0x340E7CBF, 0xDD1F6DD7, 0x3D5D582E, 0xD44C4946,
  0x03E4A7D9, 0xEAF5B6B1, 0x0AB78348, 0xE3A69220, 0x1142EEFB, 0xF853FF93, 0x1811CA6A, 0xF100DB02,
  0x6C311115, 0x8520007D, 0x65623584, 0x8C7324EC, 0x7E975837, 0x9786495F, 0x77C47CA6, 0x9ED56DCE,
  0x497D8351, 0xA06C9239, 0x402EA7C0, 0xA93FB6A8, 0x5BDBCA73, 0xB2CADB1B, 0x5288EEE2, 0xBB99FF8A};

for (val=0; val <= 0xFF; val++) {
  memset (data, val, sizeof (data));
  if (valcrc32[val] != eth_crc32 (0, data, sizeof (data))) {
    printf("Unexpected CRC for %d byte buffer containing 0x%02X. Expected %08X, got %08X\n",
           (int)sizeof (data), val, valcrc32[val], eth_crc32 (0, data, sizeof (data)));
    ++errors;
    }
  }
return (errors == 0) ? SCPE_OK : SCPE_IERR;
}

static
t_stat eth_test_bpf (DEVICE *dptr)
{
int errors = 0;
#ifdef USE_BPF
t_stat r;
DEVICE eth_tst;
ETH_DEV dev;
int reflections, all_multicast, promiscuous;
char buf[116+66*ETH_FILTER_MAX];
char mac[20];
ETH_MAC filter_address[3] = {
    {0x04, 0x05, 0x06, 0x07, 0x08, 0x09},
    {0x09, 0x00, 0x2B, 0x02, 0x01, 0x07},
    {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF},
  };
int addr_count;
ETH_MAC physical_addr = {0x04, 0x05, 0x06, 0x07, 0x08, 0x09};
ETH_MAC host_nic_phy_hw_addr = {0x02, 0x03, 0x04, 0x05, 0x06, 0x07};
ETH_MAC *host_phy_addr_list[2] = {&host_nic_phy_hw_addr, NULL};
int host_phy_addr_listindex;
ETH_MULTIHASH hash = {0x01, 0x40, 0x00, 0x00, 0x48, 0x88, 0x40, 0x00};
ETH_MULTIHASH *hash_list[2] = {&hash, NULL};
int hash_listindex;
int bpf_count = 0;
int bpf_construct_error_count = 0;
int bpf_compile_error_count = 0;
int bpf_compile_skip_count = 0;
#define SIM_PRINT_BPF_ARGUMENTS                                 \
    if (1) {                                                    \
      sim_printf ("Eth: Input to BPF string construction:\n");  \
      sim_printf ("Eth: Reflections: %d\n", reflections);       \
      sim_printf ("Eth: Filter Set:\n");                        \
      for (i = 0; i < addr_count; i++) {                        \
        eth_mac_fmt(&filter_address[i], mac);                   \
        sim_printf ("Eth:   Addr[%d]: %s\n", i, mac);           \
        }                                                       \
      if (all_multicast)                                        \
        sim_printf ("Eth: All Multicast\n");                    \
      if (promiscuous)                                          \
        sim_printf ("Eth: Promiscuous\n");                      \
      if (hash_list[hash_listindex])                            \
        sim_printf ("Eth: Multicast Hash: %02X-%02X-%02X-%02X-%02X-%02X-%02X-%02X\n",\
                    (*hash_list[hash_listindex])[0], (*hash_list[hash_listindex])[1], (*hash_list[hash_listindex])[2], (*hash_list[hash_listindex])[3], \
                    (*hash_list[hash_listindex])[4], (*hash_list[hash_listindex])[5], (*hash_list[hash_listindex])[6], (*hash_list[hash_listindex])[7]);\
      if (host_phy_addr_list[host_phy_addr_listindex]) {        \
        eth_mac_fmt(host_phy_addr_list[host_phy_addr_listindex], mac);\
        sim_printf ("Eth: host_nic_phy_hw_addr: %s\n", mac);    \
        }                                                       \
      }


memset (&eth_tst, 0, sizeof(eth_tst));
eth_open(&dev, "eth0", &eth_tst, 1);
for (reflections=0; reflections<=1; reflections++) {
  for (all_multicast=0; all_multicast<=1; all_multicast++) {
    for (promiscuous=0; promiscuous<=1; promiscuous++) {
      for (addr_count=1; addr_count<=2; addr_count++) {
        for (hash_listindex=0; hash_listindex<=1; hash_listindex++) {
          for (host_phy_addr_listindex=0; host_phy_addr_listindex<=1; host_phy_addr_listindex++) {
            int i;
            char errbuf[PCAP_ERRBUF_SIZE];

            ++bpf_count;
            r = eth_bpf_filter (&dev, addr_count, &filter_address[0], 
                                all_multicast, promiscuous, reflections, 
                                &filter_address[0], 
                                host_phy_addr_list[host_phy_addr_listindex],
                                hash_list[hash_listindex],
                                buf);
            if (r != SCPE_OK) {
              ++bpf_construct_error_count;
              sim_printf ("Eth: Error producing a BPF filter for:\n");
              SIM_PRINT_BPF_ARGUMENTS;
              }
            else {
              if (sim_switches & SWMASK('D')) {
                SIM_PRINT_BPF_ARGUMENTS;
                sim_printf ("Eth: BPF string is: |%s|\n", buf);
                }
              if (dev.eth_api == ETH_API_PCAP) {
                struct bpf_program bpf;

                if (pcap_compile ((pcap_t*)dev.handle, &bpf, buf, 1, (bpf_u_int32)0) < 0) {
                  ++bpf_compile_error_count;
                  sprintf(errbuf, "%s", pcap_geterr((pcap_t*)dev.handle));
                  sim_printf("Eth: pcap_compile error: %s\n", errbuf);
                  if (!(sim_switches & SWMASK('D'))) {
                    /* show erroneous BPF string */
                    SIM_PRINT_BPF_ARGUMENTS;
                    sim_printf ("Eth: BPF string is: |%s|\n", buf);
                    }
                  }
                pcap_freecode(&bpf);
                }
              else
                ++bpf_compile_skip_count;
              }
            }
          }
        }
      }
    }
  }
eth_close(&dev);
sim_printf ("BPF Filter Count:     %d\n", bpf_count);
if (bpf_construct_error_count)
  sim_printf ("BPF Construct Errors: %d\n", bpf_construct_error_count);
if (bpf_compile_error_count)
  sim_printf ("BPF Compile Errors:   %d\n", bpf_compile_error_count);
if (bpf_compile_skip_count)
  sim_printf ("BPF Compile Skipped:  %d\n", bpf_compile_skip_count);
#endif /* USE_BPF */
return (errors == 0) ? SCPE_OK : SCPE_IERR;
}

#include <setjmp.h>

t_stat sim_ether_test (DEVICE *dptr)
{
t_stat stat = SCPE_OK;
SIM_TEST_INIT;

sim_printf ("Testing %s device sim_ether APIs\n", dptr->name);

SIM_TEST(eth_test_crc32 (dptr));
SIM_TEST(eth_test_bpf (dptr));
return stat;
}
#endif /* USE_NETWORK */

Changes to src/SIMH/sim_fio.c.

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   02-Jan-04    RMS     Split out from SCP

   This library includes:

   sim_finit         -       initialize package
   sim_fopen         -       open file
   sim_fread         -       endian independent read (formerly fxread)
   sim_write         -       endian independent write (formerly fxwrite)
   sim_fseek         -       conditionally extended (>32b) seek (
   sim_fseeko        -       extended seek (>32b if available)
   sim_fsize         -       get file size
   sim_fsize_name    -       get file size of named file
   sim_fsize_ex      -       get file size as a t_offset
   sim_fsize_name_ex -       get file size as a t_offset of named file
   sim_buf_copy_swapped -    copy data swapping elements along the way
................................................................................
t_offset sim_fsize_ex (FILE *fp)
{
t_offset pos, sz;

if (fp == NULL)
    return 0;
pos = sim_ftell (fp);
sim_fseeko (fp, 0, SEEK_END);

sz = sim_ftell (fp);
sim_fseeko (fp, pos, SEEK_SET);

return sz;
}

t_offset sim_fsize_name_ex (const char *fname)
{
FILE *fp;
t_offset sz;







|







 







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   02-Jan-04    RMS     Split out from SCP

   This library includes:

   sim_finit         -       initialize package
   sim_fopen         -       open file
   sim_fread         -       endian independent read (formerly fxread)
   sim_fwrite        -       endian independent write (formerly fxwrite)
   sim_fseek         -       conditionally extended (>32b) seek (
   sim_fseeko        -       extended seek (>32b if available)
   sim_fsize         -       get file size
   sim_fsize_name    -       get file size of named file
   sim_fsize_ex      -       get file size as a t_offset
   sim_fsize_name_ex -       get file size as a t_offset of named file
   sim_buf_copy_swapped -    copy data swapping elements along the way
................................................................................
t_offset sim_fsize_ex (FILE *fp)
{
t_offset pos, sz;

if (fp == NULL)
    return 0;
pos = sim_ftell (fp);
if (sim_fseeko (fp, 0, SEEK_END))
    return 0;
sz = sim_ftell (fp);
if (sim_fseeko (fp, pos, SEEK_SET))
    return 0;
return sz;
}

t_offset sim_fsize_name_ex (const char *fname)
{
FILE *fp;
t_offset sz;

Changes to src/SIMH/sim_serial.c.

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static struct open_serial_device *_serial_add_to_open_list (SERHANDLE port, TMLN *line, const char *name, const char *config)
{
serial_open_devices = (struct open_serial_device *)realloc(serial_open_devices, (++serial_open_device_count)*sizeof(*serial_open_devices));
memset(&serial_open_devices[serial_open_device_count-1], 0, sizeof(serial_open_devices[serial_open_device_count-1]));
serial_open_devices[serial_open_device_count-1].port = port;
serial_open_devices[serial_open_device_count-1].line = line;
strncpy(serial_open_devices[serial_open_device_count-1].name, name, sizeof(serial_open_devices[serial_open_device_count-1].name)-1);
if (config)
    strncpy(serial_open_devices[serial_open_device_count-1].config, config, sizeof(serial_open_devices[serial_open_device_count-1].config)-1);
return &serial_open_devices[serial_open_device_count-1];
}

static void _serial_remove_from_open_list (SERHANDLE port)
{
int i, j;








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static struct open_serial_device *_serial_add_to_open_list (SERHANDLE port, TMLN *line, const char *name, const char *config)
{
serial_open_devices = (struct open_serial_device *)realloc(serial_open_devices, (++serial_open_device_count)*sizeof(*serial_open_devices));
memset(&serial_open_devices[serial_open_device_count-1], 0, sizeof(serial_open_devices[serial_open_device_count-1]));
serial_open_devices[serial_open_device_count-1].port = port;
serial_open_devices[serial_open_device_count-1].line = line;
strlcpy(serial_open_devices[serial_open_device_count-1].name, name, sizeof(serial_open_devices[serial_open_device_count-1].name));
if (config)
    strlcpy(serial_open_devices[serial_open_device_count-1].config, config, sizeof(serial_open_devices[serial_open_device_count-1].config));
return &serial_open_devices[serial_open_device_count-1];
}

static void _serial_remove_from_open_list (SERHANDLE port)
{
int i, j;

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#define WSAEHOSTUNREACH EHOSTUNREACH
#define WSAEADDRINUSE   EADDRINUSE
#if defined(EAFNOSUPPORT)
#define WSAEAFNOSUPPORT EAFNOSUPPORT
#endif
#define WSAEACCES       EACCES
#define WSAEINTR        EINTR
#define INVALID_SOCKET  ((SOCKET)-1) 

#define SOCKET_ERROR    -1

#endif

#if defined (VMS)                                       /* VMS unique */
#include <ioctl.h>                                      /* for ioctl */
#if !defined (AI_NUMERICHOST)
#define AI_NUMERICHOST 0
#endif







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#define WSAEHOSTUNREACH EHOSTUNREACH
#define WSAEADDRINUSE   EADDRINUSE
#if defined(EAFNOSUPPORT)
#define WSAEAFNOSUPPORT EAFNOSUPPORT
#endif
#define WSAEACCES       EACCES
#define WSAEINTR        EINTR
#define INVALID_SOCKET  ((SOCKET)-1)
#if !defined(SOCKET_ERROR)
#define SOCKET_ERROR    (-1)
#endif
#endif

#if defined (VMS)                                       /* VMS unique */
#include <ioctl.h>                                      /* for ioctl */
#if !defined (AI_NUMERICHOST)
#define AI_NUMERICHOST 0
#endif

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#if defined SIM_ASYNCH_IO
#include <pthread.h>
#endif

struct sim_tape_fmt {
    const char          *name;                          /* name */
    int32               uflags;                         /* unit flags */
    t_addr              bot;                            /* bot test */

    };

static struct sim_tape_fmt fmts[MTUF_N_FMT] = {
    { "SIMH", 0,       sizeof (t_mtrlnt) - 1 },
    { "E11",  0,       sizeof (t_mtrlnt) - 1 },
    { "TPC",  UNIT_RO, sizeof (t_tpclnt) - 1 },
    { "P7B",  0,       0 },
/*  { "TPF",  UNIT_RO, 0 }, */

    { NULL,   0,       0 }
    };

static const uint32 bpi [] = {                          /* tape density table, indexed by MT_DENS constants */
    0,                                                  /*   0 = MT_DENS_NONE -- density not set */
    200,                                                /*   1 = MT_DENS_200  -- 200 bpi NRZI */
    556,                                                /*   2 = MT_DENS_556  -- 556 bpi NRZI */
................................................................................
    6250                                                /*   5 = MT_DENS_6250 -- 6250 bpi GCR */
    };

#define BPI_COUNT       (sizeof (bpi) / sizeof (bpi [0]))   /* count of density table entries */

static t_stat sim_tape_ioerr (UNIT *uptr);
static t_stat sim_tape_wrdata (UNIT *uptr, uint32 dat);
static uint32 sim_tape_tpc_map (UNIT *uptr, t_addr *map, uint32 mapsize);
static t_stat sim_tape_simh_check (UNIT *uptr);
static t_stat sim_tape_e11_check (UNIT *uptr);
static t_addr sim_tape_tpc_fnd (UNIT *uptr, t_addr *map);
static void sim_tape_data_trace (UNIT *uptr, const uint8 *data, size_t len, const char* txt, int detail, uint32 reason);
static t_stat tape_erase_fwd (UNIT *uptr, t_mtrlnt gap_size);
static t_stat tape_erase_rev (UNIT *uptr, t_mtrlnt gap_size);


struct tape_context {
    DEVICE              *dptr;              /* Device for unit (access to debug flags) */
    uint32              dbit;               /* debugging bit for trace */
    uint32              auto_format;        /* Format determined dynamically */
#if defined SIM_ASYNCH_IO
    int                 asynch_io;          /* Asynchronous Interrupt scheduling enabled */
................................................................................

t_stat sim_tape_attach (UNIT *uptr, CONST char *cptr)
{
DEVICE *dptr;

if ((dptr = find_dev_from_unit (uptr)) == NULL)
    return SCPE_NOATT;
return sim_tape_attach_ex (uptr, cptr, ((dptr->flags & DEV_DEBUG) || (dptr->debflags)) ? 0xFFFFFFFF : 0, 0);
}

t_stat sim_tape_attach_ex (UNIT *uptr, const char *cptr, uint32 dbit, int completion_delay)
{
struct tape_context *ctx;
uint32 objc;
DEVICE *dptr;
char gbuf[CBUFSIZE];
t_stat r;
t_bool auto_format = FALSE;




if ((dptr = find_dev_from_unit (uptr)) == NULL)
    return SCPE_NOATT;
if (sim_switches & SWMASK ('F')) {                      /* format spec? */
    cptr = get_glyph (cptr, gbuf, 0);                   /* get spec */
    if (*cptr == 0)                                     /* must be more */
        return SCPE_2FARG;
    if (sim_tape_set_fmt (uptr, 0, gbuf, NULL) != SCPE_OK)
        return sim_messagef (SCPE_ARG, "Invalid Tape Format: %s\n", gbuf);
    sim_switches = sim_switches & ~(SWMASK ('F'));      /* Record Format specifier already processed */
    auto_format = TRUE;
    }
if (MT_GET_FMT (uptr) == MTUF_F_TPC)

















    sim_switches |= SWMASK ('R');                       /* Force ReadOnly attach for TPC tapes */
r = attach_unit (uptr, (CONST char *)cptr);             /* attach unit */
if (r != SCPE_OK)                                       /* error? */
    return sim_messagef (r, "Can't open tape image: %s\n", cptr);
switch (MT_GET_FMT (uptr)) {                            /* case on format */


    case MTUF_F_STD:                                    /* SIMH */
        if (SCPE_OK != sim_tape_simh_check (uptr)) {
            sim_tape_detach (uptr);
            return SCPE_FMT;                            /* yes, complain */
            }
        break;


    case MTUF_F_E11:                                    /* E11 */
        if (SCPE_OK != sim_tape_e11_check (uptr)) {
            sim_tape_detach (uptr);
            return SCPE_FMT;                            /* yes, complain */

            }
        break;


    case MTUF_F_TPC:                                    /* TPC */
        objc = sim_tape_tpc_map (uptr, NULL, 0);        /* get # objects */
        if (objc == 0) {                                /* tape empty? */
            sim_tape_detach (uptr);
            return SCPE_FMT;                            /* yes, complain */
            }
        uptr->filebuf = calloc (objc + 1, sizeof (t_addr));
        if (uptr->filebuf == NULL) {                    /* map allocated? */
            sim_tape_detach (uptr);
            return SCPE_MEM;                            /* no, complain */
            }
        uptr->hwmark = objc + 1;                        /* save map size */
        sim_tape_tpc_map (uptr, (t_addr *) uptr->filebuf, objc);/* fill map */
        break;





    default:
        break;
        }

uptr->tape_ctx = ctx = (struct tape_context *)calloc(1, sizeof(struct tape_context));
ctx->dptr = dptr;                                       /* save DEVICE pointer */
ctx->dbit = dbit;                                       /* save debug bit */
ctx->auto_format = auto_format;                         /* save that we auto selected format */



sim_tape_rewind (uptr);

#if defined (SIM_ASYNCH_IO)
sim_tape_set_async (uptr, completion_delay);
#endif
uptr->io_flush = _sim_tape_io_flush;






return SCPE_OK;
}

/* Detach tape unit */

t_stat sim_tape_detach (UNIT *uptr)
{
struct tape_context *ctx;
uint32 f;
t_stat r;
t_bool auto_format = FALSE;

if (uptr == NULL)
    return SCPE_IERR;



ctx = (struct tape_context *)uptr->tape_ctx;
f = MT_GET_FMT (uptr);
if ((ctx == NULL) || !(uptr->flags & UNIT_ATT))
    return SCPE_IERR;

if (uptr->io_flush)
    uptr->io_flush (uptr);                              /* flush buffered data */
if (ctx)
    auto_format = ctx->auto_format;

sim_tape_clr_async (uptr);


r = detach_unit (uptr);                                 /* detach unit */
if (r != SCPE_OK)
    return r;
switch (f) {                                            /* case on format */

    case MTUF_F_TPC:                                    /* TPC */
        if (uptr->filebuf)                              /* free map */
            free (uptr->filebuf);
        uptr->filebuf = NULL;
        uptr->hwmark = 0;
        break;

    default:
        break;
        }



sim_tape_rewind (uptr);
free (uptr->tape_ctx);
uptr->tape_ctx = NULL;
uptr->io_flush = NULL;
if (auto_format)    /* format was determined or specified at attach time? */
    sim_tape_set_fmt (uptr, 0, "SIMH", NULL);   /* restore default format */
................................................................................
else
    fprintf (st, "  sim> ATTACH {switches} %s tapefile\n\n", dptr->name);
fprintf (st, "Attach command switches\n");
fprintf (st, "    -R          Attach Read Only.\n");
fprintf (st, "    -E          Must Exist (if not specified an attempt to create the indicated\n");
fprintf (st, "                virtual tape will be attempted).\n");
fprintf (st, "    -F          Open the indicated tape container in a specific format (default\n");
fprintf (st, "                is SIMH, alternatives are E11, TPC and P7B)\n");










return SCPE_OK;
}

static void sim_tape_data_trace(UNIT *uptr, const uint8 *data, size_t len, const char* txt, int detail, uint32 reason)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;

if (ctx == NULL)
    return;
if (sim_deb && (ctx->dptr->dctrl & reason))
    sim_data_trace(ctx->dptr, uptr, (detail ? data : NULL), "", len, txt, reason);
}

/* Read record length forward (internal routine).

   Inputs:
        uptr    =       pointer to tape unit
................................................................................
static t_stat sim_tape_rdlntf (UNIT *uptr, t_mtrlnt *bc)
{
uint8    c;
t_bool   all_eof;
uint32   f = MT_GET_FMT (uptr);
t_mtrlnt sbc;
t_tpclnt tpcbc;


t_mtrlnt buffer [256];                                  /* local tape buffer */

uint32   bufcntr, bufcap;                               /* buffer counter and capacity */
int32    runaway_counter, sizeof_gap;                   /* bytes remaining before runaway and bytes per gap */
t_stat   status = MTSE_OK;

MT_CLR_PNU (uptr);                                      /* clear the position-not-updated flag */


if ((uptr->flags & UNIT_ATT) == 0)                      /* if the unit is not attached */
    return MTSE_UNATT;                                  /*   then quit with an error */

if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) {   /* set the initial tape position; if it fails */
    MT_SET_PNU (uptr);                                  /*   then set position not updated */
    status = sim_tape_ioerr (uptr);                     /*     and quit with I/O error status */
................................................................................
                if (sizeof_gap > 0)                     /*   then if detection is enabled */
                    status = MTSE_RUNAWAY;              /*     then report a tape runaway */
                else                                    /*   otherwise report the physical EOF */
                    status = MTSE_EOM;                  /*     as the end-of-medium */
                break;
                }

            uptr->pos = uptr->pos + sizeof (t_mtrlnt);  /* space over the marker */

            if (*bc == MTR_TMK) {                       /* if the value is a tape mark */
                status = MTSE_TMK;                      /*   then quit with tape mark status */
                break;
                }

            else if (*bc == MTR_GAP)                    /* otherwise if the value is a full gap */
................................................................................
                if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) {   /* set the tape position; if it fails */
                    status = sim_tape_ioerr (uptr);                     /*   then quit with I/O error status */
                    break;
                    }

                bufcntr = bufcap;                       /* mark the buffer as invalid to force a read */

                *bc = MTR_GAP;                          /* reset the marker */
                runaway_counter -= sizeof_gap / 2;      /*   and decrement the gap counter */
                }

            else {                                                      /* otherwise it's a record marker */
                if (bufcntr < bufcap                                    /* if the position is within the buffer */
                  && sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) {  /*   then seek to the data area; if it fails */
                    status = sim_tape_ioerr (uptr);                     /*     then quit with I/O error status */
                    break;
                    }

                sbc = MTR_L (*bc);                              /* extract the record length */
                uptr->pos = uptr->pos + sizeof (t_mtrlnt)       /* position to the start */
                  + (f == MTUF_F_STD ? (sbc + 1) & ~1 : sbc);   /*   of the record */
                }
            }
        while (*bc == MTR_GAP && runaway_counter > 0);  /* continue until data or runaway occurs */

        if (runaway_counter <= 0)                       /* if a tape runaway occurred */
            status = MTSE_RUNAWAY;                      /*   then report it */




























        break;                                          /* otherwise the operation succeeded */

    case MTUF_F_TPC:
        sim_fread (&tpcbc, sizeof (t_tpclnt), 1, uptr->fileref);
        *bc = tpcbc;                                    /* save rec lnt */

        if (ferror (uptr->fileref)) {                   /* error? */
            MT_SET_PNU (uptr);                          /* pos not upd */
            status = sim_tape_ioerr (uptr);
            }

        else if (feof (uptr->fileref)) {                /* eof? */


            MT_SET_PNU (uptr);                          /* pos not upd */
            status = MTSE_EOM;
            }
        else {
            uptr->pos = uptr->pos + sizeof (t_tpclnt);  /* spc over reclnt */
            if (tpcbc == TPC_TMK)                       /* tape mark? */
                status = MTSE_TMK;
            else
                uptr->pos = uptr->pos + ((tpcbc + 1) & ~1); /* spc over record */

            }
        break;

    case MTUF_F_P7B:
        for (sbc = 0, all_eof = 1; ; sbc++) {           /* loop thru record */
            sim_fread (&c, sizeof (uint8), 1, uptr->fileref);

            if (ferror (uptr->fileref)) {               /* error? */
                MT_SET_PNU (uptr);                      /* pos not upd */
                status = sim_tape_ioerr (uptr);
                break;
                }
            else if (feof (uptr->fileref)) {            /* eof? */
................................................................................
                break;
            else if ((c & P7B_DPAR) != P7B_EOF)
                all_eof = 0;
            }

        if (status == MTSE_OK) {
            *bc = sbc;                                      /* save rec lnt */
            sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* for read */
            uptr->pos = uptr->pos + sbc;                    /* spc over record */

































            if (all_eof)                                    /* tape mark? */


































                status = MTSE_TMK;


            }
        break;

    default:
        status = MTSE_FMT;
    }

................................................................................
t_stat status;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */

status = sim_tape_rdlntf (uptr, bc);                    /* read the record length */

sim_debug (MTSE_DBG_STR, ctx->dptr, "rd_lnt: st: %d, lnt: %d, pos: %" T_ADDR_FMT "u\n", status, *bc, uptr->pos);

return status;
}

/* Read record length reverse (internal routine).

   Inputs:
................................................................................
{
uint8    c;
t_bool   all_eof;
uint32   f = MT_GET_FMT (uptr);
t_addr   ppos;
t_mtrlnt sbc;
t_tpclnt tpcbc;


t_mtrlnt buffer [256];                                  /* local tape buffer */
uint32   bufcntr, bufcap;                               /* buffer counter and capacity */
int32    runaway_counter, sizeof_gap;                   /* bytes remaining before runaway and bytes per gap */
t_stat   status = MTSE_OK;

MT_CLR_PNU (uptr);                                      /* clear the position-not-updated flag */


if ((uptr->flags & UNIT_ATT) == 0)                      /* if the unit is not attached */
    return MTSE_UNATT;                                  /*   then quit with an error */

if (sim_tape_bot (uptr))                                /* if the unit is positioned at the BOT */
    status = MTSE_BOT;                                  /*   then reading backward is not possible */

................................................................................
                runaway_counter -= sizeof_gap;          /*   then decrement the gap counter */

            else if ((*bc & MTR_M_RHGAP) == MTR_RHGAP           /* otherwise if the marker */
              || *bc == MTR_RRGAP) {                            /*   is a half gap */
                uptr->pos = uptr->pos + sizeof (t_mtrlnt) / 2;  /*     then position forward to resync */
                bufcntr = 0;                                    /* mark the buffer as invalid to force a read */

                *bc = MTR_GAP;                                  /* reset the marker */
                runaway_counter -= sizeof_gap / 2;              /*   and decrement the gap counter */
                }

            else {                                              /* otherwise it's a record marker */
                sbc = MTR_L (*bc);                              /* extract the record length */
                uptr->pos = uptr->pos - sizeof (t_mtrlnt)       /* position to the start */
                  - (f == MTUF_F_STD ? (sbc + 1) & ~1 : sbc);   /*   of the record */
................................................................................
        if (runaway_counter <= 0)                       /* if a tape runaway occurred */
            status = MTSE_RUNAWAY;                      /*   then report it */

        break;                                          /* otherwise the operation succeeded */

    case MTUF_F_TPC:
        ppos = sim_tape_tpc_fnd (uptr, (t_addr *) uptr->filebuf); /* find prev rec */
        sim_fseek (uptr->fileref, ppos, SEEK_SET);      /* position */
        sim_fread (&tpcbc, sizeof (t_tpclnt), 1, uptr->fileref);
        *bc = tpcbc;                                    /* save rec lnt */

        if (ferror (uptr->fileref))                     /* error? */
            status = sim_tape_ioerr (uptr);
        else if (feof (uptr->fileref))                  /* eof? */
            status = MTSE_EOM;
        else {
            uptr->pos = ppos;                           /* spc over record */
            if (*bc == MTR_TMK)                         /* tape mark? */
                status = MTSE_TMK;
            else
                sim_fseek (uptr->fileref, uptr->pos + sizeof (t_tpclnt), SEEK_SET);
            }
        break;

    case MTUF_F_P7B:







        for (sbc = 1, all_eof = 1; (t_addr) sbc <= uptr->pos ; sbc++) {
            sim_fseek (uptr->fileref, uptr->pos - sbc, SEEK_SET);
            sim_fread (&c, sizeof (uint8), 1, uptr->fileref);











            if (ferror (uptr->fileref)) {               /* error? */
                status = sim_tape_ioerr (uptr);
                break;
                }
            else if (feof (uptr->fileref)) {            /* eof? */
                status = MTSE_EOM;
                break;
                }
            else {


                if ((c & P7B_DPAR) != P7B_EOF)
                    all_eof = 0;
                if (c & P7B_SOR)                        /* start of record? */
                    break;
                }
            }

        if (status == MTSE_OK) {
            uptr->pos = uptr->pos - sbc;                    /* update position */
            *bc = sbc;                                      /* save rec lnt */
            sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* for read */
            if (all_eof)                                    /* tape mark? */
                status = MTSE_TMK;
            }
        break;

















































































    default:
        status = MTSE_FMT;
        }

return status;
}

static t_stat sim_tape_rdrlrev (UNIT *uptr, t_mtrlnt *bc)
................................................................................
t_stat status;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */

status = sim_tape_rdlntr (uptr, bc);                    /* read the record length */

sim_debug (MTSE_DBG_STR, ctx->dptr, "rd_lnt: st: %d, lnt: %d, pos: %" T_ADDR_FMT "u\n", status, *bc, uptr->pos);

return status;
}

/* Read record forward

   Inputs:
................................................................................

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_rdrecf(unit=%d, buf=%p, max=%d)\n", (int)(uptr-ctx->dptr->units), buf, max);

opos = uptr->pos;                                       /* old position */
st = sim_tape_rdrlfwd (uptr, &tbc);                     /* read rec lnt */
if (st != MTSE_OK)

    return st;

*bc = rbc = MTR_L (tbc);                                /* strip error flag */
if (rbc > max) {                                        /* rec out of range? */
    MT_SET_PNU (uptr);
    uptr->pos = opos;
    return MTSE_INVRL;
    }
i = (t_mtrlnt) sim_fread (buf, sizeof (uint8), rbc, uptr->fileref); /* read record */
................................................................................
    uptr->pos = opos;
    return sim_tape_ioerr (uptr);
    }
for ( ; i < rbc; i++)                                   /* fill with 0's */
    buf[i] = 0;
if (f == MTUF_F_P7B)                                    /* p7b? strip SOR */
    buf[0] = buf[0] & P7B_DPAR;
sim_tape_data_trace(uptr, buf, rbc, "Record Read", ctx->dptr->dctrl & MTSE_DBG_DAT, MTSE_DBG_STR);
return (MTR_F (tbc)? MTSE_RECE: MTSE_OK);
}

t_stat sim_tape_rdrecf_a (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max, TAPE_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
................................................................................
t_stat st;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_rdrecr(unit=%d, buf=%p, max=%d)\n", (int)(uptr-ctx->dptr->units), buf, max);

st = sim_tape_rdrlrev (uptr, &tbc);                     /* read rec lnt */
if (st != MTSE_OK)

    return st;

*bc = rbc = MTR_L (tbc);                                /* strip error flag */
if (rbc > max)                                          /* rec out of range? */
    return MTSE_INVRL;
i = (t_mtrlnt) sim_fread (buf, sizeof (uint8), rbc, uptr->fileref); /* read record */
if (ferror (uptr->fileref))                             /* error? */
    return sim_tape_ioerr (uptr);
for ( ; i < rbc; i++)                                   /* fill with 0's */
    buf[i] = 0;
if (f == MTUF_F_P7B)                                    /* p7b? strip SOR */
    buf[0] = buf[0] & P7B_DPAR;
sim_tape_data_trace(uptr, buf, rbc, "Record Read Reverse", ctx->dptr->dctrl & MTSE_DBG_DAT, MTSE_DBG_STR);
return (MTR_F (tbc)? MTSE_RECE: MTSE_OK);
}

t_stat sim_tape_rdrecr_a (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max, TAPE_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
................................................................................
*/

t_stat sim_tape_wrrecf (UNIT *uptr, uint8 *buf, t_mtrlnt bc)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
uint32 f = MT_GET_FMT (uptr);
t_mtrlnt sbc;


if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_wrrecf(unit=%d, buf=%p, bc=%d)\n", (int)(uptr-ctx->dptr->units), buf, bc);

sim_tape_data_trace(uptr, buf, bc, "Record Write", ctx->dptr->dctrl & MTSE_DBG_DAT, MTSE_DBG_STR);
MT_CLR_PNU (uptr);
sbc = MTR_L (bc);
if ((uptr->flags & UNIT_ATT) == 0)                      /* not attached? */
    return MTSE_UNATT;
if (sim_tape_wrp (uptr))                                /* write prot? */
    return MTSE_WRP;
if (sbc == 0)                                           /* nothing to do? */
    return MTSE_OK;
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET);         /* set pos */

switch (f) {                                            /* case on format */

    case MTUF_F_STD:                                    /* standard */
        sbc = MTR_L ((bc + 1) & ~1);                    /* pad odd length */
        /* fall through into the E11 handler */
    case MTUF_F_E11:                                    /* E11 */
        sim_fwrite (&bc, sizeof (t_mtrlnt), 1, uptr->fileref);
        sim_fwrite (buf, sizeof (uint8), sbc, uptr->fileref);
        sim_fwrite (&bc, sizeof (t_mtrlnt), 1, uptr->fileref);
        if (ferror (uptr->fileref)) {                   /* error? */
            MT_SET_PNU (uptr);
            return sim_tape_ioerr (uptr);
            }
        uptr->pos = uptr->pos + sbc + (2 * sizeof (t_mtrlnt));  /* move tape */
        break;

    case MTUF_F_P7B:                                    /* Pierce 7B */
        buf[0] = buf[0] | P7B_SOR;                      /* mark start of rec */
        sim_fwrite (buf, sizeof (uint8), sbc, uptr->fileref);
        sim_fwrite (buf, sizeof (uint8), 1, uptr->fileref); /* delimit rec */
        if (ferror (uptr->fileref)) {                   /* error? */
            MT_SET_PNU (uptr);
            return sim_tape_ioerr (uptr);
            }
        uptr->pos = uptr->pos + sbc;                    /* move tape */
        break;





        }
sim_tape_data_trace(uptr, buf, sbc, "Record Written", ctx->dptr->dctrl & MTSE_DBG_DAT, MTSE_DBG_STR);
return MTSE_OK;
}

t_stat sim_tape_wrrecf_a (UNIT *uptr, uint8 *buf, t_mtrlnt bc, TAPE_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
    r = sim_tape_wrrecf (uptr, buf, bc);
AIO_CALL(TOP_WREC, buf, 0, NULL, 0, bc, 0, 0, NULL, callback);
return r;
}











































/* Write metadata forward (internal routine) */

static t_stat sim_tape_wrdata (UNIT *uptr, uint32 dat)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;

................................................................................
MT_CLR_PNU (uptr);
if ((uptr->flags & UNIT_ATT) == 0)                      /* not attached? */
    return MTSE_UNATT;
if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
if (sim_tape_wrp (uptr))                                /* write prot? */
    return MTSE_WRP;
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET);         /* set pos */
sim_fwrite (&dat, sizeof (t_mtrlnt), 1, uptr->fileref);
if (ferror (uptr->fileref)) {                           /* error? */
    MT_SET_PNU (uptr);
    return sim_tape_ioerr (uptr);
    }
sim_debug (MTSE_DBG_STR, ctx->dptr, "wr_lnt: lnt: %d, pos: %" T_ADDR_FMT "u\n", dat, uptr->pos);
uptr->pos = uptr->pos + sizeof (t_mtrlnt);              /* move tape */
return MTSE_OK;
}

/* Write tape mark */

t_stat sim_tape_wrtmk (UNIT *uptr)
................................................................................
if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_wrtmk(unit=%d)\n", (int)(uptr-ctx->dptr->units));
if (MT_GET_FMT (uptr) == MTUF_F_P7B) {                  /* P7B? */
    uint8 buf = P7B_EOF;                                /* eof mark */
    return sim_tape_wrrecf (uptr, &buf, 1);             /* write char */
    }


return sim_tape_wrdata (uptr, MTR_TMK);
}

t_stat sim_tape_wrtmk_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
................................................................................
{
t_stat result;
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_wreom(unit=%d)\n", (int)(uptr-ctx->dptr->units));


if (MT_GET_FMT (uptr) == MTUF_F_P7B)                    /* cant do P7B */
    return MTSE_FMT;





result = sim_tape_wrdata (uptr, MTR_EOM);               /* write the EOM marker */

uptr->pos = uptr->pos - sizeof (t_mtrlnt);              /* restore original tape position */

MT_SET_PNU (uptr);                                      /* indicate that position was not updated */

return result;
}

t_stat sim_tape_wreom_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
................................................................................
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat r;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_wreomrw(unit=%d)\n", (int)(uptr-ctx->dptr->units));
if (MT_GET_FMT (uptr) == MTUF_F_P7B)                    /* cant do P7B */
    return MTSE_FMT;
r = sim_tape_wrdata (uptr, MTR_EOM);
if (r == MTSE_OK)
    r = sim_tape_rewind (uptr);
return r;
}

t_stat sim_tape_wreomrw_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
................................................................................
        return MTSE_BOT;                                /*     then erasing backward is not possible */
    else                                                /*   otherwise */
        uptr->pos -= meta_size;                         /*     back up the file pointer */

    if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) /* position the tape; if it fails */
        return sim_tape_ioerr (uptr);                   /*   then quit with I/O error status */

    sim_fread (&metadatum, meta_size, 1, uptr->fileref);    /* read a metadatum */

    if (ferror (uptr->fileref))                             /* if a file I/O error occurred */
        return sim_tape_ioerr (uptr);                       /*   then report the error and quit */

    else if (metadatum == MTR_TMK)                          /* otherwise if a tape mark is present */
        if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) /*   then reposition the tape; if it fails */
            return sim_tape_ioerr (uptr);                   /*     then quit with I/O error status */
................................................................................
if (uptr->flags & UNIT_ATT) {
    if (ctx == NULL)                                    /* if not properly attached? */
        return sim_messagef (SCPE_IERR, "Bad Attach\n");/*   that's a problem */
    sim_debug_unit (ctx->dbit, uptr, "sim_tape_rewind(unit=%d)\n", (int)(uptr-ctx->dptr->units));
    }
uptr->pos = 0;
MT_CLR_PNU (uptr);

return MTSE_OK;
}

t_stat sim_tape_rewind_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
................................................................................
return (uptr->capac && (uptr->pos >= uptr->capac))? TRUE: FALSE;
}

/* Test for write protect */

t_bool sim_tape_wrp (UNIT *uptr)
{
return ((uptr->flags & MTUF_WRP) || (MT_GET_FMT (uptr) == MTUF_F_TPC))? TRUE: FALSE;
}

/* Process I/O error */

static t_stat sim_tape_ioerr (UNIT *uptr)
{
sim_printf ("%s: Magtape library I/O error: %s\n", sim_uname (uptr), strerror (errno));
................................................................................

/* Map a TPC format tape image */

static uint32 sim_tape_tpc_map (UNIT *uptr, t_addr *map, uint32 mapsize)
{
t_addr tpos, leot;
t_addr tape_size;
t_tpclnt bc, last_bc = 0xFFFF;
uint32 had_double_tape_mark = 0;
size_t i;
uint32 objc, sizec;
uint32 *countmap = NULL;
uint8 *recbuf = NULL;
DEVICE *dptr = find_dev_from_unit (uptr);

if ((uptr == NULL) || (uptr->fileref == NULL))
    return 0;
countmap = (uint32 *)calloc (65536, sizeof(*countmap));
recbuf = (uint8 *)malloc (65536);
tape_size = (t_addr)sim_fsize (uptr->fileref);
sim_debug (MTSE_DBG_STR, dptr, "tpc_map: tape_size: %" T_ADDR_FMT "u\n", tape_size);
for (objc = 0, sizec = 0, tpos = 0;; ) {
    sim_fseek (uptr->fileref, tpos, SEEK_SET);
    i = sim_fread (&bc, sizeof (t_tpclnt), 1, uptr->fileref);
    if (i == 0)     /* past or at eof? */
        break;
    if (countmap[bc] == 0)
        sizec++;
    ++countmap[bc];
    if (map && (objc < mapsize))
        map[objc] = tpos;
    if (bc) {
        sim_debug (MTSE_DBG_STR, dptr, "tpc_map: %d byte count at pos: %" T_ADDR_FMT "u\n", bc, tpos);
        if (sim_deb && (dptr->dctrl & MTSE_DBG_STR)) {
            sim_fread (recbuf, 1, bc, uptr->fileref);
            sim_data_trace(dptr, uptr, ((dptr->dctrl & MTSE_DBG_DAT) ? recbuf : NULL), "", bc, "Data Record", MTSE_DBG_STR);
            }
        }
    else
        sim_debug (MTSE_DBG_STR, dptr, "tpc_map: tape mark at pos: %" T_ADDR_FMT "u\n", tpos);
    objc++;
    tpos = tpos + ((bc + 1) & ~1) + sizeof (t_tpclnt);
    if ((bc == 0) && (last_bc == 0)) {  /* double tape mark? */
        had_double_tape_mark = objc;
        leot = tpos;
        }
    last_bc = bc;
    }
sim_debug (MTSE_DBG_STR, dptr, "tpc_map: objc: %u, different record sizes: %u\n", objc, sizec);
for (i=0; i<65535; i++) {
    if (countmap[i]) {
        if (i == 0)
            sim_debug (MTSE_DBG_STR, dptr, "tpc_map: summary - %u tape marks\n", countmap[i]);
        else
            sim_debug (MTSE_DBG_STR, dptr, "tpc_map: summary - %u %d byte record%s\n", countmap[i], (int)i, (countmap[i] > 1) ? "s" : "");
        }
    }
if (((last_bc != 0xffff) && 
     (tpos > tape_size) &&
     (!had_double_tape_mark))    ||
    (!had_double_tape_mark)      ||
    ((objc == countmap[0]) && 
     (countmap[0] != 2))) {     /* Unreasonable format? */
    if (last_bc != 0xffff)
        sim_debug (MTSE_DBG_STR, dptr, "tpc_map: ERROR unexpected EOT byte count: %d\n", last_bc);
    if (tpos > tape_size)
        sim_debug (MTSE_DBG_STR, dptr, "tpc_map: ERROR next record position %" T_ADDR_FMT "u beyond EOT: %" T_ADDR_FMT "u\n", tpos, tape_size);
    if (objc == countmap[0])
        sim_debug (MTSE_DBG_STR, dptr, "tpc_map: ERROR tape cnly contains tape marks\n");
    free (countmap);
    free (recbuf);
    return 0;
    }

if ((last_bc != 0xffff) && (tpos > tape_size)) {
    sim_debug (MTSE_DBG_STR, dptr, "tpc_map: WARNING unexpected EOT byte count: %d, double tape mark before %" T_ADDR_FMT "u provides logical EOT\n", last_bc, leot);
    objc = had_double_tape_mark;
    tpos = leot;
    }
if (map)
    map[objc] = tpos;
sim_debug (MTSE_DBG_STR, dptr, "tpc_map: OK objc: %d\n", objc);
free (countmap);
free (recbuf);
return objc;
}

/* Check the basic structure of a SIMH format tape image */
























static t_stat sim_tape_simh_check (UNIT *uptr)
{

























return SCPE_OK;




}






/* Check the basic structure of a E11 format tape image */


















static t_stat sim_tape_e11_check (UNIT *uptr)



















































{




























return SCPE_OK;
}

/* Find the preceding record in a TPC file */

static t_addr sim_tape_tpc_fnd (UNIT *uptr, t_addr *map)
{
................................................................................
        fprintf (st, "density=%d bpi", tape_density);   /*   then report it */
    else                                                /* otherwise */
        fprintf (st, "density not set");                /*   it was never set by the caller */
    }

return SCPE_OK;
}





















































































































































































































































































































t_stat sim_tape_test (DEVICE *dptr)
{


































return SCPE_OK;
}







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#if defined SIM_ASYNCH_IO
#include <pthread.h>
#endif

struct sim_tape_fmt {
    const char          *name;                          /* name */
    int32          uflags;                         /* unit flags */
    t_addr              bot;                            /* bot test */
    t_addr              eom_remnant;                    /* potentially unprocessed data */
    };

static struct sim_tape_fmt fmts[MTUF_N_FMT] = {
    { "SIMH", 0,       sizeof (t_mtrlnt) - 1,  sizeof (t_mtrlnt)},
    { "E11",  0,       sizeof (t_mtrlnt) - 1,  sizeof (t_mtrlnt) },
    { "TPC",  UNIT_RO, sizeof (t_tpclnt) - 1,  sizeof (t_tpclnt) },
    { "P7B",  0,       0,                      0 },
    { "AWS",  0,       0,                      0 },
    { "TAR",  0,       0,                      0 },
    { NULL,   0,       0 }
    };

static const uint32 bpi [] = {                          /* tape density table, indexed by MT_DENS constants */
    0,                                                  /*   0 = MT_DENS_NONE -- density not set */
    200,                                                /*   1 = MT_DENS_200  -- 200 bpi NRZI */
    556,                                                /*   2 = MT_DENS_556  -- 556 bpi NRZI */
................................................................................
    6250                                                /*   5 = MT_DENS_6250 -- 6250 bpi GCR */
    };

#define BPI_COUNT       (sizeof (bpi) / sizeof (bpi [0]))   /* count of density table entries */

static t_stat sim_tape_ioerr (UNIT *uptr);
static t_stat sim_tape_wrdata (UNIT *uptr, uint32 dat);
static t_stat sim_tape_aws_wrdata (UNIT *uptr, uint8 *buf, t_mtrlnt bc);
static uint32 sim_tape_tpc_map (UNIT *uptr, t_addr *map, uint32 mapsize);
static t_stat sim_tape_scan_tape (UNIT *uptr);
static t_addr sim_tape_tpc_fnd (UNIT *uptr, t_addr *map);
static void sim_tape_data_trace (UNIT *uptr, const uint8 *data, size_t len, const char* txt, int detail, uint32 reason);
static t_stat tape_erase_fwd (UNIT *uptr, t_mtrlnt gap_size);
static t_stat tape_erase_rev (UNIT *uptr, t_mtrlnt gap_size);


struct tape_context {
    DEVICE              *dptr;              /* Device for unit (access to debug flags) */
    uint32              dbit;               /* debugging bit for trace */
    uint32              auto_format;        /* Format determined dynamically */
#if defined SIM_ASYNCH_IO
    int                 asynch_io;          /* Asynchronous Interrupt scheduling enabled */
................................................................................

t_stat sim_tape_attach (UNIT *uptr, CONST char *cptr)
{
DEVICE *dptr;

if ((dptr = find_dev_from_unit (uptr)) == NULL)
    return SCPE_NOATT;
return sim_tape_attach_ex (uptr, cptr, ((dptr->flags & DEV_DEBUG) || (dptr->debflags)) ? MTSE_DBG_API : 0, 0);
}

t_stat sim_tape_attach_ex (UNIT *uptr, const char *cptr, uint32 dbit, int completion_delay)
{
struct tape_context *ctx;
uint32 objc;
DEVICE *dptr;
char gbuf[CBUFSIZE];
t_stat r;
t_bool auto_format = FALSE;
t_bool had_debug = (sim_deb != NULL);
uint32 starting_dctrl = uptr->dctrl;
int32 saved_switches = sim_switches;

if ((dptr = find_dev_from_unit (uptr)) == NULL)
    return SCPE_NOATT;
if (sim_switches & SWMASK ('F')) {                      /* format spec? */
    cptr = get_glyph (cptr, gbuf, 0);                   /* get spec */
    if (*cptr == 0)                                     /* must be more */
        return sim_messagef (SCPE_2FARG, "Missing Format specifier and filename to attach\n");
    if (sim_tape_set_fmt (uptr, 0, gbuf, NULL) != SCPE_OK)
        return sim_messagef (SCPE_ARG, "Invalid Tape Format: %s\n", gbuf);
    sim_switches = sim_switches & ~(SWMASK ('F'));      /* Record Format specifier already processed */
    auto_format = TRUE;
    }
if (MT_GET_FMT (uptr) == MTUF_F_TAR) {
    if (sim_switches & SWMASK ('B')) {                  /* Record Size (blocking factor)? */
        uint32 recsize;

        cptr = get_glyph (cptr, gbuf, 0);                   /* get spec */
        if (*cptr == 0)                                     /* must be more */
            return sim_messagef (SCPE_2FARG, "Missing Record Size and filename to attach\n");
        recsize = (uint32) get_uint (gbuf, 10, 65536, &r);
        if ((r != SCPE_OK) || (recsize == 0))
            return sim_messagef (SCPE_ARG, "Invalid Tape Record Size: %s\n", gbuf);
        uptr->recsize = recsize;
        sim_switches = sim_switches & ~(SWMASK ('B'));      /* Record Blocking Factor */
        }
    if (uptr->recsize == 0)
        uptr->recsize = TAR_DFLT_RECSIZE;
    }
if ((MT_GET_FMT (uptr) == MTUF_F_TPC) ||
    (MT_GET_FMT (uptr) == MTUF_F_TAR))
    sim_switches |= SWMASK ('R');                       /* Force ReadOnly attach for TPC and TAR tapes */
r = attach_unit (uptr, (CONST char *)cptr);             /* attach unit */
if (r != SCPE_OK)                                       /* error? */
    return sim_messagef (r, "Can't open tape image: %s\n", cptr);


if ((sim_switches & SWMASK ('D')) && !had_debug) {
    sim_switches |= SWMASK ('E');
    sim_switches &= ~(SWMASK ('D') | SWMASK ('R') | SWMASK ('F'));
    sim_set_debon (0, "STDOUT");
    sim_switches = saved_switches;
    }
if (sim_switches & SWMASK ('D'))
    uptr->dctrl = MTSE_DBG_STR | MTSE_DBG_DAT;


uptr->tape_ctx = ctx = (struct tape_context *)calloc(1, sizeof(struct tape_context));
ctx->dptr = dptr;                                       /* save DEVICE pointer */
ctx->dbit = dbit;                                       /* save debug bit */
ctx->auto_format = auto_format;                         /* save that we auto selected format */


switch (MT_GET_FMT (uptr)) {                            /* case on format */

    case MTUF_F_TPC:                                    /* TPC */
        objc = sim_tape_tpc_map (uptr, NULL, 0);        /* get # objects */
        if (objc == 0) {                                /* tape empty? */
            sim_tape_detach (uptr);
            r = SCPE_FMT;                               /* yes, complain */
            }
        uptr->filebuf = calloc (objc + 1, sizeof (t_addr));
        if (uptr->filebuf == NULL) {                    /* map allocated? */
            sim_tape_detach (uptr);
            r = SCPE_MEM;                               /* no, complain */
            }
        uptr->hwmark = objc + 1;                        /* save map size */
        sim_tape_tpc_map (uptr, (t_addr *) uptr->filebuf, objc);/* fill map */
        break;

    case MTUF_F_TAR:                                    /* TAR */
        uptr->hwmark = (t_addr)sim_fsize (uptr->fileref);
        break;

    default:
        break;
        }





if (r == SCPE_OK) {
    sim_tape_scan_tape (uptr);

    sim_tape_rewind (uptr);

#if defined (SIM_ASYNCH_IO)
    sim_tape_set_async (uptr, completion_delay);
#endif
    uptr->io_flush = _sim_tape_io_flush;
    }

if ((sim_switches & SWMASK ('D')) && !had_debug)
    sim_set_deboff (0, "");
if (sim_switches & SWMASK ('D'))
    uptr->dctrl = starting_dctrl;
return r;
}

/* Detach tape unit */

t_stat sim_tape_detach (UNIT *uptr)
{
struct tape_context *ctx;
uint32 f;
t_stat r;
t_bool auto_format = FALSE;

if (uptr == NULL)
    return SCPE_IERR;
if (!(uptr->flags & UNIT_ATT))
    return SCPE_UNATT;

ctx = (struct tape_context *)uptr->tape_ctx;
f = MT_GET_FMT (uptr);



if (uptr->io_flush)
    uptr->io_flush (uptr);                              /* flush buffered data */
if (ctx)
    auto_format = ctx->auto_format;

sim_tape_clr_async (uptr);

MT_CLR_INMRK (uptr);                                    /* Not within an AWS or TAR tapemark */
r = detach_unit (uptr);                                 /* detach unit */
if (r != SCPE_OK)
    return r;
switch (f) {                                            /* case on format */

    case MTUF_F_TPC:                                    /* TPC */
        if (uptr->filebuf)                              /* free map */
            free (uptr->filebuf);
        uptr->filebuf = NULL;

        break;

    default:
        break;
        }
uptr->hwmark = 0;
uptr->recsize = 0;

sim_tape_rewind (uptr);
free (uptr->tape_ctx);
uptr->tape_ctx = NULL;
uptr->io_flush = NULL;
if (auto_format)    /* format was determined or specified at attach time? */
    sim_tape_set_fmt (uptr, 0, "SIMH", NULL);   /* restore default format */
................................................................................
else
    fprintf (st, "  sim> ATTACH {switches} %s tapefile\n\n", dptr->name);
fprintf (st, "Attach command switches\n");
fprintf (st, "    -R          Attach Read Only.\n");
fprintf (st, "    -E          Must Exist (if not specified an attempt to create the indicated\n");
fprintf (st, "                virtual tape will be attempted).\n");
fprintf (st, "    -F          Open the indicated tape container in a specific format (default\n");
fprintf (st, "                is SIMH, alternatives are E11, TPC, P7B, AWS and TAR)\n");
fprintf (st, "    -B          For TAR format tapes, the record size for data read from the\n");
fprintf (st, "                specified file.  This record size will be used for all but\n");
fprintf (st, "                possibly the last record which will be what remains unread.\n");
fprintf (st, "                The default TAR record size is 10240.\n");
fprintf (st, "    -V          Display some summary information about the record structure\n");
fprintf (st, "                contained in the tape image scan performed when it is attached.\n");
fprintf (st, "    -S          Perform reverse reads and forward skips during the attach time\n");
fprintf (st, "                tape image scan.\n");
fprintf (st, "    -D          Causes the internal tape structure information to be displayed\n");
fprintf (st, "                while the tape image is scanned.\n");
return SCPE_OK;
}

static void sim_tape_data_trace(UNIT *uptr, const uint8 *data, size_t len, const char* txt, int detail, uint32 reason)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;

if (ctx == NULL)
    return;
if (sim_deb && ((uptr->dctrl | ctx->dptr->dctrl) & reason))
    sim_data_trace(ctx->dptr, uptr, (detail ? data : NULL), "", len, txt, reason);
}

/* Read record length forward (internal routine).

   Inputs:
        uptr    =       pointer to tape unit
................................................................................
static t_stat sim_tape_rdlntf (UNIT *uptr, t_mtrlnt *bc)
{
uint8    c;
t_bool   all_eof;
uint32   f = MT_GET_FMT (uptr);
t_mtrlnt sbc;
t_tpclnt tpcbc;
t_awshdr awshdr;
size_t   rdcnt;
t_mtrlnt buffer [256];                                  /* local tape buffer */
t_addr saved_pos;
uint32   bufcntr, bufcap;                               /* buffer counter and capacity */
int32    runaway_counter, sizeof_gap;                   /* bytes remaining before runaway and bytes per gap */
t_stat   status = MTSE_OK;

MT_CLR_PNU (uptr);                                      /* clear the position-not-updated flag */
*bc = 0;

if ((uptr->flags & UNIT_ATT) == 0)                      /* if the unit is not attached */
    return MTSE_UNATT;                                  /*   then quit with an error */

if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) {   /* set the initial tape position; if it fails */
    MT_SET_PNU (uptr);                                  /*   then set position not updated */
    status = sim_tape_ioerr (uptr);                     /*     and quit with I/O error status */
................................................................................
                if (sizeof_gap > 0)                     /*   then if detection is enabled */
                    status = MTSE_RUNAWAY;              /*     then report a tape runaway */
                else                                    /*   otherwise report the physical EOF */
                    status = MTSE_EOM;                  /*     as the end-of-medium */
                break;
                }

            uptr->pos += sizeof (t_mtrlnt);             /* space over the marker */

            if (*bc == MTR_TMK) {                       /* if the value is a tape mark */
                status = MTSE_TMK;                      /*   then quit with tape mark status */
                break;
                }

            else if (*bc == MTR_GAP)                    /* otherwise if the value is a full gap */
................................................................................
                if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) {   /* set the tape position; if it fails */
                    status = sim_tape_ioerr (uptr);                     /*   then quit with I/O error status */
                    break;
                    }

                bufcntr = bufcap;                       /* mark the buffer as invalid to force a read */

                *bc = (t_mtrlnt)MTR_GAP;                /* reset the marker */
                runaway_counter -= sizeof_gap / 2;      /*   and decrement the gap counter */
                }

            else {                                                      /* otherwise it's a record marker */
                saved_pos = uptr->pos;                          /* Save data position */





                sbc = MTR_L (*bc);                              /* extract the record length */
                uptr->pos = uptr->pos + sizeof (t_mtrlnt)       /* position to the start */
                  + (f == MTUF_F_STD ? (sbc + 1) & ~1 : sbc);   /*   of the record */
                }
            }
        while (*bc == MTR_GAP && runaway_counter > 0);  /* continue until data or runaway occurs */

        if (runaway_counter <= 0)                       /* if a tape runaway occurred */
            status = MTSE_RUNAWAY;                      /*   then report it */

        if (status == MTSE_OK) {                        /* Validate the reverse record size */
            t_mtrlnt rev_lnt;

            if (sim_fseek (uptr->fileref, uptr->pos - sizeof (t_mtrlnt), SEEK_SET)){  /*   then seek to the end of record size; if it fails */
                status = sim_tape_ioerr (uptr);         /*     then quit with I/O error status */
                break;
                }

            (void)sim_fread (&rev_lnt,                  /* get the reverse length */
                             sizeof (t_mtrlnt),
                             1,
                             uptr->fileref);

            if (ferror (uptr->fileref)) {               /* if a file I/O error occurred */
                status = sim_tape_ioerr (uptr);         /* report the error and quit */
                break;
                }
            if (sim_fseek (uptr->fileref, saved_pos, SEEK_SET)){  /*   then seek back to the beginning of the data; if it fails */
                status = sim_tape_ioerr (uptr);         /*     then quit with I/O error status */
                break;
                }
            if (rev_lnt != *bc) {           /* size mismatch? */
                status = MTSE_INVRL;
                uptr->pos -= (sizeof (t_mtrlnt) + *bc + sizeof (t_mtrlnt));
                MT_SET_PNU (uptr);                      /* pos not upd */
                }
            }
        break;                                          /* otherwise the operation succeeded */

    case MTUF_F_TPC:
        (void)sim_fread (&tpcbc, sizeof (t_tpclnt), 1, uptr->fileref);
        *bc = (t_mtrlnt)tpcbc;                          /* save rec lnt */

        if (ferror (uptr->fileref)) {                   /* error? */
            MT_SET_PNU (uptr);                          /* pos not upd */
            status = sim_tape_ioerr (uptr);
            }
        else {
            if ((feof (uptr->fileref)) ||               /* eof? */
                ((tpcbc == TPC_EOM) && 
                 (sim_fsize (uptr->fileref) == (uint32)sim_ftell (uptr->fileref)))) {
                MT_SET_PNU (uptr);                          /* pos not upd */
                status = MTSE_EOM;
                }
            else {
                uptr->pos = uptr->pos + sizeof (t_tpclnt);  /* spc over reclnt */
                if (tpcbc == TPC_TMK)                       /* tape mark? */
                    status = MTSE_TMK;
                else
                    uptr->pos = uptr->pos + ((tpcbc + 1) & ~1); /* spc over record */
                }
            }
        break;

    case MTUF_F_P7B:
        for (sbc = 0, all_eof = 1; ; sbc++) {           /* loop thru record */
            (void)sim_fread (&c, sizeof (uint8), 1, uptr->fileref);

            if (ferror (uptr->fileref)) {               /* error? */
                MT_SET_PNU (uptr);                      /* pos not upd */
                status = sim_tape_ioerr (uptr);
                break;
                }
            else if (feof (uptr->fileref)) {            /* eof? */
................................................................................
                break;
            else if ((c & P7B_DPAR) != P7B_EOF)
                all_eof = 0;
            }

        if (status == MTSE_OK) {
            *bc = sbc;                                      /* save rec lnt */
            (void)sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* for read */
            uptr->pos = uptr->pos + sbc;                    /* spc over record */
            if (all_eof) {                                  /* tape mark? */
                status = MTSE_TMK;
                *bc = 0;
                }
            }
        break;

    case MTUF_F_AWS:
        MT_CLR_INMRK (uptr);                        /* Not within an AWS tapemark */
        memset (&awshdr, 0, sizeof (awshdr));
        rdcnt = sim_fread (&awshdr, sizeof (t_awslnt), 3, uptr->fileref);

        if (ferror (uptr->fileref)) {               /* error? */
            MT_SET_PNU (uptr);                      /* pos not upd */
            status = sim_tape_ioerr (uptr);
            break;
            }
        if ((feof (uptr->fileref)) ||               /* eof? */
            (rdcnt < 3)) {
            MT_SET_PNU (uptr);                      /* pos not upd */
            status = MTSE_EOM;
            break;
            }
        uptr->pos += sizeof (t_awshdr);             /* spc over AWS header */
        if (awshdr.rectyp == AWS_TMK) {             /* tape mark? */
            status = MTSE_TMK;
            MT_SET_INMRK (uptr);                    /* within an AWS tapemark */
            }
        else
            if (awshdr.rectyp != AWS_REC) {         /* Unknown record type */
                MT_SET_PNU (uptr);                  /* pos not upd */
                status = MTSE_INVRL;
                }
            else {                                  /* tape data record */
                t_addr saved_pos;

                *bc = (t_mtrlnt)awshdr.nxtlen;      /* save rec lnt */
                uptr->pos += awshdr.nxtlen;         /* spc over record */
                memset (&awshdr, 0, sizeof (t_awslnt));
                saved_pos = (t_addr)sim_ftell (uptr->fileref);
                (void)sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* for read */
                (void)sim_fread (&awshdr, sizeof (t_awslnt), 3, uptr->fileref);
                if (awshdr.rectyp == AWS_TMK)
                    MT_SET_INMRK (uptr);            /* within an AWS tapemark */
                if (awshdr.prelen != *bc) {
                    status = MTSE_INVRL;
                    uptr->pos = saved_pos - sizeof (t_awslnt);
                    MT_CLR_INMRK (uptr);            /* not within an AWS tapemark */
                    }
                else
                    (void)sim_fseek (uptr->fileref, saved_pos, SEEK_SET); /* Move back to the data */
                }
        break;

    case MTUF_F_TAR:
        if (uptr->pos < uptr->hwmark) {
            if ((uptr->hwmark - uptr->pos) >= uptr->recsize)
                *bc = (t_mtrlnt)uptr->recsize;              /* TAR record size */
            else
                *bc = (t_mtrlnt)(uptr->hwmark - uptr->pos); /* TAR remnant last record */
            (void)sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); 
            uptr->pos += *bc;
            MT_CLR_INMRK (uptr);
            }
        else {
            if (MT_TST_INMRK (uptr))
                status = MTSE_EOM;
            else {
                status = MTSE_TMK;
                MT_SET_INMRK (uptr);
                }
            }
        break;

    default:
        status = MTSE_FMT;
    }

................................................................................
t_stat status;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */

status = sim_tape_rdlntf (uptr, bc);                    /* read the record length */

sim_debug_unit (MTSE_DBG_STR, uptr, "rd_lntf: st: %d, lnt: %d, pos: %" T_ADDR_FMT "u\n", status, *bc, uptr->pos);

return status;
}

/* Read record length reverse (internal routine).

   Inputs:
................................................................................
{
uint8    c;
t_bool   all_eof;
uint32   f = MT_GET_FMT (uptr);
t_addr   ppos;
t_mtrlnt sbc;
t_tpclnt tpcbc;
t_awshdr awshdr;
size_t   rdcnt;
t_mtrlnt buffer [256];                                  /* local tape buffer */
uint32   bufcntr, bufcap;                               /* buffer counter and capacity */
int32    runaway_counter, sizeof_gap;                   /* bytes remaining before runaway and bytes per gap */
t_stat   status = MTSE_OK;

MT_CLR_PNU (uptr);                                      /* clear the position-not-updated flag */
*bc = 0;

if ((uptr->flags & UNIT_ATT) == 0)                      /* if the unit is not attached */
    return MTSE_UNATT;                                  /*   then quit with an error */

if (sim_tape_bot (uptr))                                /* if the unit is positioned at the BOT */
    status = MTSE_BOT;                                  /*   then reading backward is not possible */

................................................................................
                runaway_counter -= sizeof_gap;          /*   then decrement the gap counter */

            else if ((*bc & MTR_M_RHGAP) == MTR_RHGAP           /* otherwise if the marker */
              || *bc == MTR_RRGAP) {                            /*   is a half gap */
                uptr->pos = uptr->pos + sizeof (t_mtrlnt) / 2;  /*     then position forward to resync */
                bufcntr = 0;                                    /* mark the buffer as invalid to force a read */

                *bc = (t_mtrlnt)MTR_GAP;                        /* reset the marker */
                runaway_counter -= sizeof_gap / 2;              /*   and decrement the gap counter */
                }

            else {                                              /* otherwise it's a record marker */
                sbc = MTR_L (*bc);                              /* extract the record length */
                uptr->pos = uptr->pos - sizeof (t_mtrlnt)       /* position to the start */
                  - (f == MTUF_F_STD ? (sbc + 1) & ~1 : sbc);   /*   of the record */
................................................................................
        if (runaway_counter <= 0)                       /* if a tape runaway occurred */
            status = MTSE_RUNAWAY;                      /*   then report it */

        break;                                          /* otherwise the operation succeeded */

    case MTUF_F_TPC:
        ppos = sim_tape_tpc_fnd (uptr, (t_addr *) uptr->filebuf); /* find prev rec */
        (void)sim_fseek (uptr->fileref, ppos, SEEK_SET);/* position */
        (void)sim_fread (&tpcbc, sizeof (t_tpclnt), 1, uptr->fileref);
        *bc = (t_mtrlnt)tpcbc;                          /* save rec lnt */

        if (ferror (uptr->fileref))                     /* error? */
            status = sim_tape_ioerr (uptr);
        else if (feof (uptr->fileref))                  /* eof? */
            status = MTSE_EOM;
        else {
            uptr->pos = ppos;                           /* spc over record */
            if (*bc == MTR_TMK)                         /* tape mark? */
                status = MTSE_TMK;
            else
                (void)sim_fseek (uptr->fileref, uptr->pos + sizeof (t_tpclnt), SEEK_SET);
            }
        break;

    case MTUF_F_P7B:
        if (1) {
#define BUF_SZ 512
            uint8 buf[BUF_SZ];
            t_addr buf_offset;
            size_t bytes_in_buf = 0;
            size_t read_size;

            for (sbc = 1, all_eof = 1; (t_addr) sbc <= uptr->pos ; sbc++) {


                if (bytes_in_buf == 0) {        /* Need to Fill Buffer */
                    if (uptr->pos < BUF_SZ) {
                        buf_offset = 0;
                        read_size = (size_t)uptr->pos;
                        }
                    else {
                        buf_offset = uptr->pos - (sbc - 1 + BUF_SZ);
                        read_size = BUF_SZ;
                        }
                    (void)sim_fseek (uptr->fileref, buf_offset, SEEK_SET);
                    bytes_in_buf = sim_fread (buf, sizeof (uint8), read_size, uptr->fileref);
                    if (ferror (uptr->fileref)) {               /* error? */
                        status = sim_tape_ioerr (uptr);
                        break;
                        }
                    if (feof (uptr->fileref)) {                 /* eof? */
                        status = MTSE_EOM;
                        break;
                        }

                    }
                c = buf[--bytes_in_buf];
                if ((c & P7B_DPAR) != P7B_EOF)
                    all_eof = 0;
                if (c & P7B_SOR)                        /* start of record? */
                    break;
                }


            if (status == MTSE_OK) {
                uptr->pos = uptr->pos - sbc;                    /* update position */
                *bc = sbc;                                      /* save rec lnt */
                (void)sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* for next read */
                if (all_eof)                                    /* tape mark? */
                    status = MTSE_TMK;
                }
            break;
            }

    case MTUF_F_AWS:
        *bc = sbc = 0;
        while ((sbc == 0) && (status == MTSE_OK)) {
            if (sim_tape_bot (uptr)) {                      /* if we start at BOT */
                status = MTSE_BOT;                          /*   then we're done */
                break;
                }
            (void)sim_fseek (uptr->fileref, uptr->pos, SEEK_SET);/* position */
            memset (&awshdr, 0, sizeof (awshdr));
            rdcnt = sim_fread (&awshdr, sizeof (t_awslnt), 3, uptr->fileref);
            if (ferror (uptr->fileref)) {                   /* error? */
                status = sim_tape_ioerr (uptr);
                break;
                }
            if (feof (uptr->fileref)) {                 /* eof? */
                if ((uptr->pos > sizeof (t_awshdr)) &&
                    (uptr->pos >= sim_fsize (uptr->fileref))) {
                    if (MT_TST_INMRK (uptr)) {
                        status = MTSE_TMK;
                        MT_CLR_INMRK (uptr);
                        uptr->pos -= sizeof (awshdr);
                        }
                    else
                        status = MTSE_EOM;                  /*   then we're done */
                    break;
                    }
                }
            if ((rdcnt != 3) || 
                ((awshdr.rectyp != AWS_REC) && 
                 (awshdr.rectyp != AWS_TMK))) {
                status = MTSE_INVRL;
                break;
                }
            if (MT_TST_INMRK (uptr))                    /* already in a tapemark? */
                awshdr.rectyp = AWS_REC;
            MT_CLR_INMRK (uptr);                        /* No longer in a tapemark */
            *bc = (t_mtrlnt)((awshdr.rectyp == AWS_REC) ? awshdr.prelen : 0);/* save rec lnt */
            sbc = *bc;                                  /* extract the record length */
            if ((awshdr.rectyp != AWS_TMK) ||
                (awshdr.prelen == 0)) {
                uptr->pos -= sizeof (t_awshdr);         /* position to the start of the record */
                uptr->pos -= awshdr.prelen;             /* Including the data length */

                if (sim_fseek (uptr->fileref,           /* seek to the start of the data area; if it fails */
                               uptr->pos + sizeof (t_awshdr),
                               SEEK_SET)) {
                    status = sim_tape_ioerr (uptr);     /* then return with I/O error status */
                    break;
                    }
                }
            if (awshdr.rectyp == AWS_TMK) {             /* tape mark? */
                status = MTSE_TMK;
                if (awshdr.prelen != 0)
                    MT_SET_INMRK (uptr);                /* Flag processing a tapemark header */
                }
            }
        break;

     case MTUF_F_TAR:
         if (uptr->pos == uptr->hwmark) {
             if (MT_TST_INMRK (uptr)) {
                 status = MTSE_TMK;
                 MT_CLR_INMRK (uptr);
                 }
             else {
                 if (uptr->hwmark % uptr->recsize)
                     *bc = (t_mtrlnt)(uptr->hwmark % uptr->recsize);
                 else
                     *bc = (t_mtrlnt)uptr->recsize;
                 }
             }
         else
             *bc = (t_mtrlnt)uptr->recsize;
         if (*bc) {
             uptr->pos -= *bc;
             (void)sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); 
             }
        break;

   default:
        status = MTSE_FMT;
        }

return status;
}

static t_stat sim_tape_rdrlrev (UNIT *uptr, t_mtrlnt *bc)
................................................................................
t_stat status;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */

status = sim_tape_rdlntr (uptr, bc);                    /* read the record length */

sim_debug_unit (MTSE_DBG_STR, uptr, "rd_lntr: st: %d, lnt: %d, pos: %" T_ADDR_FMT "u\n", status, *bc, uptr->pos);

return status;
}

/* Read record forward

   Inputs:
................................................................................

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_rdrecf(unit=%d, buf=%p, max=%d)\n", (int)(uptr-ctx->dptr->units), buf, max);

opos = uptr->pos;                                       /* old position */
st = sim_tape_rdrlfwd (uptr, &tbc);                     /* read rec lnt */
if (st != MTSE_OK) {
    *bc = 0;
    return st;
    }
*bc = rbc = MTR_L (tbc);                                /* strip error flag */
if (rbc > max) {                                        /* rec out of range? */
    MT_SET_PNU (uptr);
    uptr->pos = opos;
    return MTSE_INVRL;
    }
i = (t_mtrlnt) sim_fread (buf, sizeof (uint8), rbc, uptr->fileref); /* read record */
................................................................................
    uptr->pos = opos;
    return sim_tape_ioerr (uptr);
    }
for ( ; i < rbc; i++)                                   /* fill with 0's */
    buf[i] = 0;
if (f == MTUF_F_P7B)                                    /* p7b? strip SOR */
    buf[0] = buf[0] & P7B_DPAR;
sim_tape_data_trace(uptr, buf, rbc, "Record Read", (uptr->dctrl | ctx->dptr->dctrl) & MTSE_DBG_DAT, MTSE_DBG_STR);
return (MTR_F (tbc)? MTSE_RECE: MTSE_OK);
}

t_stat sim_tape_rdrecf_a (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max, TAPE_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
................................................................................
t_stat st;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_rdrecr(unit=%d, buf=%p, max=%d)\n", (int)(uptr-ctx->dptr->units), buf, max);

st = sim_tape_rdrlrev (uptr, &tbc);                     /* read rec lnt */
if (st != MTSE_OK) {
    *bc = 0;
    return st;
    }
*bc = rbc = MTR_L (tbc);                                /* strip error flag */
if (rbc > max)                                          /* rec out of range? */
    return MTSE_INVRL;
i = (t_mtrlnt) sim_fread (buf, sizeof (uint8), rbc, uptr->fileref); /* read record */
if (ferror (uptr->fileref))                             /* error? */
    return sim_tape_ioerr (uptr);
for ( ; i < rbc; i++)                                   /* fill with 0's */
    buf[i] = 0;
if (f == MTUF_F_P7B)                                    /* p7b? strip SOR */
    buf[0] = buf[0] & P7B_DPAR;
sim_tape_data_trace(uptr, buf, rbc, "Record Read Reverse", (uptr->dctrl | ctx->dptr->dctrl) & MTSE_DBG_DAT, MTSE_DBG_STR);
return (MTR_F (tbc)? MTSE_RECE: MTSE_OK);
}

t_stat sim_tape_rdrecr_a (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max, TAPE_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
................................................................................
*/

t_stat sim_tape_wrrecf (UNIT *uptr, uint8 *buf, t_mtrlnt bc)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
uint32 f = MT_GET_FMT (uptr);
t_mtrlnt sbc;
t_stat status = MTSE_OK;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_wrrecf(unit=%d, buf=%p, bc=%d)\n", (int)(uptr-ctx->dptr->units), buf, bc);

sim_tape_data_trace(uptr, buf, bc, "Record Write", (uptr->dctrl | ctx->dptr->dctrl) & MTSE_DBG_DAT, MTSE_DBG_STR);
MT_CLR_PNU (uptr);
sbc = MTR_L (bc);
if ((uptr->flags & UNIT_ATT) == 0)                      /* not attached? */
    return MTSE_UNATT;
if (sim_tape_wrp (uptr))                                /* write prot? */
    return MTSE_WRP;
if (sbc == 0)                                           /* nothing to do? */
    return MTSE_OK;
if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET))     /* set pos */
    return MTSE_IOERR;
switch (f) {                                            /* case on format */

    case MTUF_F_STD:                                    /* standard */
        sbc = MTR_L ((bc + 1) & ~1);                    /* pad odd length */
        /* fall through into the E11 handler */
    case MTUF_F_E11:                                    /* E11 */
        (void)sim_fwrite (&bc, sizeof (t_mtrlnt), 1, uptr->fileref);
        (void)sim_fwrite (buf, sizeof (uint8), sbc, uptr->fileref);
        (void)sim_fwrite (&bc, sizeof (t_mtrlnt), 1, uptr->fileref);
        if (ferror (uptr->fileref)) {                   /* error? */
            MT_SET_PNU (uptr);
            return sim_tape_ioerr (uptr);
            }
        uptr->pos = uptr->pos + sbc + (2 * sizeof (t_mtrlnt));  /* move tape */
        break;

    case MTUF_F_P7B:                                    /* Pierce 7B */
        buf[0] = buf[0] | P7B_SOR;                      /* mark start of rec */
        (void)sim_fwrite (buf, sizeof (uint8), sbc, uptr->fileref);
        (void)sim_fwrite (buf, sizeof (uint8), 1, uptr->fileref); /* delimit rec */
        if (ferror (uptr->fileref)) {                   /* error? */
            MT_SET_PNU (uptr);
            return sim_tape_ioerr (uptr);
            }
        uptr->pos = uptr->pos + sbc;                    /* move tape */
        break;
    case MTUF_F_AWS:                                    /* AWS */
        status = sim_tape_aws_wrdata (uptr, buf, bc);
        if (status != MTSE_OK)
            return status;
        break;
        }
sim_tape_data_trace(uptr, buf, sbc, "Record Written", (uptr->dctrl | ctx->dptr->dctrl) & MTSE_DBG_DAT, MTSE_DBG_STR);
return MTSE_OK;
}

t_stat sim_tape_wrrecf_a (UNIT *uptr, uint8 *buf, t_mtrlnt bc, TAPE_PCALLBACK callback)
{
t_stat r = SCPE_OK;
AIO_CALLSETUP
    r = sim_tape_wrrecf (uptr, buf, bc);
AIO_CALL(TOP_WREC, buf, 0, NULL, 0, bc, 0, 0, NULL, callback);
return r;
}

/* Write AWS metadata (and possibly data) forward (internal routine) */

static t_stat sim_tape_aws_wrdata (UNIT *uptr, uint8 *buf, t_mtrlnt bc)
{
t_awshdr awshdr;
size_t   rdcnt;
t_bool   replacing_record;

memset (&awshdr, 0, sizeof (t_awshdr));
if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) /* set pos */
    return MTSE_IOERR;
rdcnt = sim_fread (&awshdr, sizeof (t_awslnt), 3, uptr->fileref);
if (ferror (uptr->fileref)) {               /* error? */
    MT_SET_PNU (uptr);                      /* pos not upd */
    return sim_tape_ioerr (uptr);
    }
if ((!sim_tape_bot (uptr)) && 
    (((feof (uptr->fileref)) && (rdcnt < 3)) || /* eof? */
     ((awshdr.rectyp != AWS_REC) && (awshdr.rectyp != AWS_TMK)))) {
    MT_SET_PNU (uptr);                      /* pos not upd */
    return MTSE_INVRL;
    }
if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) /* set pos */
    return MTSE_IOERR;
replacing_record = (awshdr.nxtlen == (t_awslnt)bc) && (awshdr.rectyp == (bc ? AWS_REC : AWS_TMK));
awshdr.nxtlen = (t_awslnt)bc;
awshdr.rectyp = (bc) ? AWS_REC : AWS_TMK;
(void)sim_fwrite (&awshdr, sizeof (t_awslnt), 3, uptr->fileref);
if (bc)
    (void)sim_fwrite (buf, sizeof (uint8), bc, uptr->fileref);
uptr->pos += sizeof (awshdr) + bc;
if ((!replacing_record) || (bc == 0)) {
    awshdr.prelen = bc;
    awshdr.nxtlen = 0;
    awshdr.rectyp = AWS_TMK;
    (void)sim_fwrite (&awshdr, sizeof (t_awslnt), 3, uptr->fileref);
    if (!replacing_record)
        sim_set_fsize (uptr->fileref, uptr->pos + sizeof (awshdr));
    }
return MTSE_OK;
}

/* Write metadata forward (internal routine) */

static t_stat sim_tape_wrdata (UNIT *uptr, uint32 dat)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;

................................................................................
MT_CLR_PNU (uptr);
if ((uptr->flags & UNIT_ATT) == 0)                      /* not attached? */
    return MTSE_UNATT;
if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
if (sim_tape_wrp (uptr))                                /* write prot? */
    return MTSE_WRP;
(void)sim_fseek (uptr->fileref, uptr->pos, SEEK_SET);         /* set pos */
(void)sim_fwrite (&dat, sizeof (t_mtrlnt), 1, uptr->fileref);
if (ferror (uptr->fileref)) {                           /* error? */
    MT_SET_PNU (uptr);
    return sim_tape_ioerr (uptr);
    }
sim_debug_unit (MTSE_DBG_STR, uptr, "wr_lnt: lnt: %d, pos: %" T_ADDR_FMT "u\n", dat, uptr->pos);
uptr->pos = uptr->pos + sizeof (t_mtrlnt);              /* move tape */
return MTSE_OK;
}

/* Write tape mark */

t_stat sim_tape_wrtmk (UNIT *uptr)
................................................................................
if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_wrtmk(unit=%d)\n", (int)(uptr-ctx->dptr->units));
if (MT_GET_FMT (uptr) == MTUF_F_P7B) {                  /* P7B? */
    uint8 buf = P7B_EOF;                                /* eof mark */
    return sim_tape_wrrecf (uptr, &buf, 1);             /* write char */
    }
if (MT_GET_FMT (uptr) == MTUF_F_AWS)                    /* AWS? */
    return sim_tape_aws_wrdata (uptr, NULL, 0);
return sim_tape_wrdata (uptr, MTR_TMK);
}

t_stat sim_tape_wrtmk_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
................................................................................
{
t_stat result;
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_wreom(unit=%d)\n", (int)(uptr-ctx->dptr->units));
if (sim_tape_wrp (uptr))                                /* write prot? */
    return MTSE_WRP;
if (MT_GET_FMT (uptr) == MTUF_F_P7B)                    /* cant do P7B */
    return MTSE_FMT;
if (MT_GET_FMT (uptr) == MTUF_F_AWS) {
    sim_set_fsize (uptr->fileref, uptr->pos);
    result = MTSE_OK;
    }
else {
    result = sim_tape_wrdata (uptr, MTR_EOM);           /* write the EOM marker */

    uptr->pos = uptr->pos - sizeof (t_mtrlnt);              /* restore original tape position */
    }
MT_SET_PNU (uptr);                                      /* indicate that position was not updated */

return result;
}

t_stat sim_tape_wreom_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
................................................................................
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
t_stat r;

if (ctx == NULL)                                        /* if not properly attached? */
    return sim_messagef (SCPE_IERR, "Bad Attach\n");    /*   that's a problem */
sim_debug_unit (ctx->dbit, uptr, "sim_tape_wreomrw(unit=%d)\n", (int)(uptr-ctx->dptr->units));


r = sim_tape_wreom (uptr);
if (r == MTSE_OK)
    r = sim_tape_rewind (uptr);
return r;
}

t_stat sim_tape_wreomrw_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
................................................................................
        return MTSE_BOT;                                /*     then erasing backward is not possible */
    else                                                /*   otherwise */
        uptr->pos -= meta_size;                         /*     back up the file pointer */

    if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) /* position the tape; if it fails */
        return sim_tape_ioerr (uptr);                   /*   then quit with I/O error status */

    (void)sim_fread (&metadatum, meta_size, 1, uptr->fileref);/* read a metadatum */

    if (ferror (uptr->fileref))                             /* if a file I/O error occurred */
        return sim_tape_ioerr (uptr);                       /*   then report the error and quit */

    else if (metadatum == MTR_TMK)                          /* otherwise if a tape mark is present */
        if (sim_fseek (uptr->fileref, uptr->pos, SEEK_SET)) /*   then reposition the tape; if it fails */
            return sim_tape_ioerr (uptr);                   /*     then quit with I/O error status */
................................................................................
if (uptr->flags & UNIT_ATT) {
    if (ctx == NULL)                                    /* if not properly attached? */
        return sim_messagef (SCPE_IERR, "Bad Attach\n");/*   that's a problem */
    sim_debug_unit (ctx->dbit, uptr, "sim_tape_rewind(unit=%d)\n", (int)(uptr-ctx->dptr->units));
    }
uptr->pos = 0;
MT_CLR_PNU (uptr);
MT_CLR_INMRK (uptr);                                    /* Not within an AWS or TAR tapemark */
return MTSE_OK;
}

t_stat sim_tape_rewind_a (UNIT *uptr, TAPE_PCALLBACK callback)
{
t_stat r = MTSE_OK;
AIO_CALLSETUP
................................................................................
return (uptr->capac && (uptr->pos >= uptr->capac))? TRUE: FALSE;
}

/* Test for write protect */

t_bool sim_tape_wrp (UNIT *uptr)
{
return ((uptr->flags & MTUF_WRP) || (uptr->flags & UNIT_RO) || (MT_GET_FMT (uptr) == MTUF_F_TPC))? TRUE: FALSE;
}

/* Process I/O error */

static t_stat sim_tape_ioerr (UNIT *uptr)
{
sim_printf ("%s: Magtape library I/O error: %s\n", sim_uname (uptr), strerror (errno));
................................................................................

/* Map a TPC format tape image */

static uint32 sim_tape_tpc_map (UNIT *uptr, t_addr *map, uint32 mapsize)
{
t_addr tpos, leot;
t_addr tape_size;
t_tpclnt bc, last_bc = TPC_EOM;
uint32 had_double_tape_mark = 0;
size_t i;
uint32 objc, sizec;
uint32 *countmap = NULL;
uint8 *recbuf = NULL;
DEVICE *dptr = find_dev_from_unit (uptr);

if ((uptr == NULL) || (uptr->fileref == NULL))
    return 0;
countmap = (uint32 *)calloc (65536, sizeof(*countmap));
recbuf = (uint8 *)malloc (65536);
tape_size = (t_addr)sim_fsize (uptr->fileref);
sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: tape_size: %" T_ADDR_FMT "u\n", tape_size);
for (objc = 0, sizec = 0, tpos = 0;; ) {
    (void)sim_fseek (uptr->fileref, tpos, SEEK_SET);
    i = sim_fread (&bc, sizeof (t_tpclnt), 1, uptr->fileref);
    if (i == 0)     /* past or at eof? */
        break;
    if (countmap[bc] == 0)
        sizec++;
    ++countmap[bc];
    if (map && (objc < mapsize))
        map[objc] = tpos;
    if (bc) {
        sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: %d byte count at pos: %" T_ADDR_FMT "u\n", bc, tpos);
        if (map && sim_deb && (dptr->dctrl & MTSE_DBG_STR)) {
            (void)sim_fread (recbuf, 1, bc, uptr->fileref);
            sim_data_trace(dptr, uptr, (((uptr->dctrl | dptr->dctrl) & MTSE_DBG_DAT) ? recbuf : NULL), "", bc, "Data Record", MTSE_DBG_STR);
            }
        }
    else
        sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: tape mark at pos: %" T_ADDR_FMT "u\n", tpos);
    objc++;
    tpos = tpos + ((bc + 1) & ~1) + sizeof (t_tpclnt);
    if ((bc == 0) && (last_bc == 0)) {  /* double tape mark? */
        had_double_tape_mark = objc;
        leot = tpos;
        }
    last_bc = bc;
    }
sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: objc: %u, different record sizes: %u\n", objc, sizec);
for (i=0; i<65535; i++) {
    if (countmap[i]) {
        if (i == 0)
            sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: summary - %u tape marks\n", countmap[i]);
        else
            sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: summary - %u %d byte record%s\n", countmap[i], (int)i, (countmap[i] > 1) ? "s" : "");
        }
    }
if (((last_bc != TPC_EOM) && 
     (tpos > tape_size) &&
     (!had_double_tape_mark))    ||
    (!had_double_tape_mark)      ||
    ((objc == countmap[0]) && 
     (countmap[0] != 2))) {     /* Unreasonable format? */
    if (last_bc != TPC_EOM)
        sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: ERROR unexpected EOT byte count: %d\n", last_bc);
    if (tpos > tape_size)
        sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: ERROR next record position %" T_ADDR_FMT "u beyond EOT: %" T_ADDR_FMT "u\n", tpos, tape_size);
    if (objc == countmap[0])
        sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: ERROR tape cnly contains tape marks\n");
    free (countmap);
    free (recbuf);
    return 0;
    }

if ((last_bc != TPC_EOM) && (tpos > tape_size)) {
    sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: WARNING unexpected EOT byte count: %d, double tape mark before %" T_ADDR_FMT "u provides logical EOT\n", last_bc, leot);
    objc = had_double_tape_mark;
    tpos = leot;
    }
if (map)
    map[objc] = tpos;
sim_debug_unit (MTSE_DBG_STR, uptr, "tpc_map: OK objc: %d\n", objc);
free (countmap);
free (recbuf);
return objc;
}

static 
const char *sim_tape_error_text (t_stat stat)
{
const char *mtse_errors[] = {
    "no error",
    "tape mark",
    "unattached",
    "I/O error",
    "invalid record length",
    "invalid format",
    "beginning of tape",
    "end of medium",
    "error in record",
    "write protected",
    "Logical End Of Tape",
    "tape runaway"
    };
static char msgbuf[64];

if (stat <= MTSE_MAX_ERR)
    return mtse_errors[stat];
sprintf(msgbuf, "Error %d", stat);
return msgbuf;
}

static t_stat sim_tape_scan_tape (UNIT *uptr)
{
t_addr saved_pos = uptr->pos;
uint32 record_in_file = 0;
uint32 data_total = 0;
uint32 tapemark_total = 0;
uint32 record_total = 0;
uint32 unique_record_sizes = 0;
t_stat r = SCPE_OK;
t_stat r_f;
t_stat r_r;
t_stat r_s;
uint8 *buf_f = NULL;
uint8 *buf_r = NULL;
uint32 *rec_sizes = NULL;
t_mtrlnt bc_f;
t_mtrlnt bc_r;
t_mtrlnt bc_s;
t_mtrlnt bc;
t_addr pos_f;
t_addr pos_r;
t_mtrlnt max = MTR_MAXLEN;

if (!(uptr->flags & UNIT_ATT))
    return SCPE_UNATT;
buf_f = (uint8 *)malloc (max);
if (buf_f == NULL)
    return SCPE_MEM;
buf_r = (uint8 *)malloc (max);
if (buf_r == NULL) {
    free (buf_f);
    return SCPE_MEM;
    }
rec_sizes = (uint32 *)calloc (max + 1, sizeof (*rec_sizes));
if (rec_sizes == NULL) {
    free (buf_f);
    free (buf_r);
    return SCPE_MEM;
    }

r = sim_tape_rewind (uptr);
while (r == SCPE_OK) {
    pos_f = uptr->pos;
    memset (buf_f, 0, max);
    r_f = sim_tape_rdrecf (uptr, buf_f, &bc_f, max);
    switch (r_f) {
    case MTSE_OK:                                   /* no error */
    case MTSE_TMK:                                  /* tape mark */
        if (r_f == MTSE_OK)
            ++record_total;
        else
            ++tapemark_total;
        data_total += bc_f;
        if (bc_f != 0) {
            if (rec_sizes[bc_f] == 0)
                ++unique_record_sizes;
            ++rec_sizes[bc_f];
            }

        if (sim_switches & SWMASK ('S')) {
            memset (buf_r, 0, max);
            r_r = sim_tape_rdrecr (uptr, buf_r, &bc_r, max);
            pos_r = uptr->pos;
            if (r_r != r_f) {
                sim_printf ("Forward Record Read returned: %s, Reverse read returned: %s\n", sim_tape_error_text (r_f), sim_tape_error_text (r_r));
                break;
                }
            if (bc_f != bc_r) {
                sim_printf ("Forward Record Read record length: %d, Reverse read record length: %d\n", bc_f, bc_r);
                break;
                }
            if (0 != memcmp (buf_f, buf_r, bc_f)) {
                sim_printf ("%d byte record contents differ when read forward amd backwards start from position %" T_ADDR_FMT "u\n", bc_f, pos_f);
                break;
                }
            if (pos_f != pos_r) {
                sim_printf ("Unexpected tape file position between forward and reverse record read: (%" T_ADDR_FMT "u, %" T_ADDR_FMT "u\n", pos_f, pos_r);
                break;
                }
            r_s = sim_tape_sprecf (uptr, &bc_s);
            if (r_s != r_f) {
                sim_printf ("Unexpected Space Record Status: %s vs %s\n", sim_tape_error_text (r_s), sim_tape_error_text (r_f));
                break;
                }
            if (bc_s != bc_f) {
                sim_printf ("Unexpected Space Record Length: %d vs %d\n", bc_s, bc_f);
                break;
                }
            }
        r = SCPE_OK;
        break;
    case MTSE_INVRL:                                /* invalid rec lnt */
    case MTSE_FMT:                                  /* invalid format */
    case MTSE_BOT:                                  /* beginning of tape */
    case MTSE_RECE:                                 /* error in record */
    case MTSE_WRP:                                  /* write protected */
    case MTSE_LEOT:                                 /* Logical End Of Tape */
    case MTSE_RUNAWAY:                              /* tape runaway */
    default:
        r = r_f;
        break;
    case MTSE_EOM:                                  /* end of medium */
        r = r_f;
        break;
        }
    }
if ((r != MTSE_EOM) || (sim_switches & SWMASK ('V')) || 
    ((uint32)(sim_fsize_ex (uptr->fileref) - (t_offset)uptr->pos) > fmts[MT_GET_FMT (uptr)].eom_remnant) ||
    (unique_record_sizes > 2 * tapemark_total)) {
    uint32 remaining_data = (uint32)(sim_fsize_ex (uptr->fileref) - (t_offset)uptr->pos);

    sim_printf ("Tape Image '%s' scanned as %s format.\n", uptr->filename, fmts[MT_GET_FMT (uptr)].name);
    if (r != MTSE_EOM)
        sim_printf ("After processing ");
    else
        sim_printf ("contains ");
    sim_printf ("%u bytes of tape data (%u records, %u tapemarks)\n",
                data_total, record_total, tapemark_total);
    if (record_total > 0) {
        sim_printf ("Comprising %d different sized records (in record size order):\n", unique_record_sizes);
        for (bc = 0; bc <= max; bc++) {
            if (rec_sizes[bc])
                sim_printf ("%8u %u byte records\n", rec_sizes[bc], (uint32)bc);
            }
        }
    if (r != MTSE_EOM)
        sim_printf ("Read Tape Record Returned Unexpected Status: %s\n", sim_tape_error_text (r));
    if (remaining_data > fmts[MT_GET_FMT (uptr)].eom_remnant)
        sim_printf ("%u bytes of unexamined data remain in the tape image file\n", remaining_data);
    }
if (unique_record_sizes > 2 * tapemark_total) {
    sim_printf ("An unreasonable number of record sizes(%u) vs tape marks (%u) have been found\n", unique_record_sizes, tapemark_total);
    sim_printf ("The tape format (%s) might not be correct for the '%s' tape image\n", fmts[MT_GET_FMT (uptr)].name, uptr->filename);
    }

free (buf_f);
free (buf_r);
free (rec_sizes);
uptr->pos = saved_pos;
return SCPE_OK;
}

/* Find the preceding record in a TPC file */

static t_addr sim_tape_tpc_fnd (UNIT *uptr, t_addr *map)
{
................................................................................
        fprintf (st, "density=%d bpi", tape_density);   /*   then report it */
    else                                                /* otherwise */
        fprintf (st, "density not set");                /*   it was never set by the caller */
    }

return SCPE_OK;
}

/* list supported densities

   translates the mask of supported densities to a string list in the form: 
   
           "(800|1600|6250)"

   this string may be useful to construct a MTAB help string for a 
   SET <unit> DENSITY= command.

*/

t_stat sim_tape_density_supported (char *string, size_t string_size, int32 valid_bits)
{
uint32 density;
int32 count;

strlcpy (string, "", string_size);
if ((!valid_bits) || (valid_bits >> BPI_COUNT))
    return SCPE_ARG;
for (density = count = 0; density < BPI_COUNT; density++) {
    if (valid_bits & (1 << density)) {
        char density_str[20];

        ++count;
        if (count == 1)
            strlcat (string, "{", string_size);
        else
            strlcat (string, "|", string_size);
        sprintf (density_str, "%d", bpi[density]);
        strlcat (string, density_str, string_size);
        }
    }
if ((count == 1) && (string_size > 1))
    memmove (string, string + 1, strlen (string));
else
    strlcat (string, "}", string_size);
return SCPE_OK;
}

static DEBTAB tape_debug[] = {
  {"TRACE",     MTSE_DBG_API,       "API Trace"},
  {"DATA",      MTSE_DBG_DAT,       "Tape Data"},
  {"POS",       MTSE_DBG_POS,       "Positioning Activities"},
  {"STR",       MTSE_DBG_STR,       "Tape Structure"},
  {0}
};

t_stat sim_tape_add_debug (DEVICE *dptr)
{
if (DEV_TYPE(dptr) != DEV_TAPE)
    return SCPE_OK;
return sim_add_debug_flags (dptr, tape_debug);
}

static t_bool p7b_parity_inited = FALSE;
static uint8 p7b_odd_parity[64];
static uint8 p7b_even_parity[64];

static t_stat sim_tape_test_create_tape_files (UNIT *uptr, const char *filename, int files, int records, int max_size)
{
FILE *fSIMH = NULL;
FILE *fE11 = NULL;
FILE *fTPC = NULL;
FILE *fP7B = NULL;
FILE *fAWS = NULL;
FILE *fTAR = NULL;
FILE *fTAR2 = NULL;
int i, j, k;
t_tpclnt tpclnt;
t_mtrlnt mtrlnt;
t_awslnt awslnt;
t_awslnt awslnt_last = 0;
t_awslnt awsrec_typ = AWS_REC;
char name[256];
t_stat stat = SCPE_OPENERR;
uint8 *buf = NULL;
t_stat aws_stat;
int32 saved_switches = sim_switches;

srand (0);                      /* All devices use the same random sequence for file data */
if (max_size == 0)
    max_size = 65535;
if (!p7b_parity_inited) {
    for (i=0; i < 64; i++) {
        int bit_count = 0;

        for (j=0; j<6; j++) {
            if (i & (1 << j))
                ++bit_count;
            }
        p7b_odd_parity[i] = i | ((~bit_count & 1) << 6);
        p7b_even_parity[i] = i | ((bit_count & 1) << 6);
        }
    p7b_parity_inited = TRUE;
    }
buf = (uint8 *)malloc (65536);
if (buf == NULL)
    return SCPE_MEM;
sprintf (name, "%s.simh", filename);
fSIMH = fopen (name, "wb");
if (fSIMH  == NULL)
    goto Done_Files;
sprintf (name, "%s.e11", filename);
fE11 = fopen (name, "wb");
if (fE11  == NULL)
    goto Done_Files;
sprintf (name, "%s.tpc", filename);
fTPC = fopen (name, "wb");
if (fTPC  == NULL)
    goto Done_Files;
sprintf (name, "%s.p7b", filename);
fP7B = fopen (name, "wb");
if (fP7B  == NULL)
    goto Done_Files;
sprintf (name, "%s.tar", filename);
fTAR = fopen (name, "wb");
if (fTAR  == NULL)
    goto Done_Files;
sprintf (name, "%s.2.tar", filename);
fTAR2 = fopen (name, "wb");
if (fTAR2  == NULL)
    goto Done_Files;
sprintf (name, "%s.aws", filename);
fAWS = fopen (name, "wb");
if (fAWS  == NULL)
    goto Done_Files;
sprintf (name, "aws %s.aws.tape", filename);
(void)remove (name);
sim_switches = SWMASK ('F') | (sim_switches & SWMASK ('D')) | SWMASK ('N');
if (sim_switches & SWMASK ('D'))
    uptr->dctrl = MTSE_DBG_STR | MTSE_DBG_DAT;
aws_stat = sim_tape_attach_ex (uptr, name, (saved_switches & SWMASK ('D')) ? MTSE_DBG_STR | MTSE_DBG_DAT: 0, 0);
sim_switches = saved_switches;
stat = SCPE_OK;
for (i=0; i<files; i++) {
    int rec_size = 1 + (rand () % max_size);

    awslnt = mtrlnt = tpclnt = rec_size;
    for (j=0; j<records; j++) {
        awsrec_typ = AWS_REC;
        if (sim_switches & SWMASK ('V'))
            sim_printf ("Writing %d byte record\n", rec_size);
        for (k=0; k<rec_size; k++)
            buf[k] = rand () & 0xFF;
        (void)sim_fwrite (&mtrlnt,       sizeof (mtrlnt),       1, fSIMH);
        (void)sim_fwrite (&mtrlnt,       sizeof (mtrlnt),       1, fE11);
        (void)sim_fwrite (&tpclnt,       sizeof (tpclnt),       1, fTPC);
        (void)sim_fwrite (&awslnt,       sizeof (awslnt),       1, fAWS);
        (void)sim_fwrite (&awslnt_last,  sizeof (awslnt_last),  1, fAWS);
        (void)sim_fwrite (&awsrec_typ,   sizeof (awsrec_typ),   1, fAWS);
        awslnt_last = awslnt;
        (void)sim_fwrite (buf, 1, rec_size, fSIMH);
        (void)sim_fwrite (buf, 1, rec_size, fE11);
        (void)sim_fwrite (buf, 1, rec_size, fTPC);
        (void)sim_fwrite (buf, 1, rec_size, fAWS);
        stat = sim_tape_wrrecf (uptr, buf, rec_size);
        if (MTSE_OK != stat)
            goto Done_Files;
        if (rec_size & 1) {
            (void)sim_fwrite (&tpclnt, 1, 1, fSIMH);
            (void)sim_fwrite (&tpclnt, 1, 1, fTPC);
            }
        (void)sim_fwrite (&mtrlnt, sizeof (mtrlnt), 1, fSIMH);
        (void)sim_fwrite (&mtrlnt, sizeof (mtrlnt), 1, fE11);
        for (k=0; k<rec_size; k++)
            buf[k] = p7b_odd_parity[buf[k] & 0x3F]; /* Only 6 data bits plus parity */
        buf[0] |= P7B_SOR;
        (void)sim_fwrite (buf, 1, rec_size, fP7B);
        }
    awslnt_last = awslnt;
    mtrlnt = tpclnt = awslnt = 0;
    awsrec_typ = AWS_TMK;
    (void)sim_fwrite (&mtrlnt, sizeof (mtrlnt), 1, fSIMH);
    (void)sim_fwrite (&mtrlnt, sizeof (mtrlnt), 1, fE11);
    (void)sim_fwrite (&tpclnt, sizeof (tpclnt), 1, fTPC);
    buf[0] = P7B_SOR | P7B_EOF;
    (void)sim_fwrite (buf, 1, 1, fP7B);
    (void)sim_fwrite (&awslnt,       sizeof (awslnt),       1, fAWS);
    (void)sim_fwrite (&awslnt_last,  sizeof (awslnt_last),  1, fAWS);
    (void)sim_fwrite (&awsrec_typ,   sizeof (awsrec_typ),   1, fAWS);
    awslnt_last = 0;
    stat = sim_tape_wrtmk (uptr);
    if (MTSE_OK != stat)
        goto Done_Files;
    }
mtrlnt = tpclnt = 0;
(void)sim_fwrite (&mtrlnt, sizeof (mtrlnt), 1, fSIMH);
(void)sim_fwrite (&mtrlnt, sizeof (mtrlnt), 1, fE11);
(void)sim_fwrite (&tpclnt, sizeof (tpclnt), 1, fTPC);
awslnt_last = awslnt;
awsrec_typ = AWS_TMK;
(void)sim_fwrite (&awslnt,       sizeof (awslnt),       1, fAWS);
(void)sim_fwrite (&awslnt_last,  sizeof (awslnt_last),  1, fAWS);
(void)sim_fwrite (&awsrec_typ,   sizeof (awsrec_typ),   1, fAWS);
mtrlnt = 0xffffffff;
tpclnt = 0xffff;
(void)sim_fwrite (&mtrlnt, sizeof (mtrlnt), 1, fSIMH);
(void)sim_fwrite (&mtrlnt, sizeof (mtrlnt), 1, fE11);
(void)sim_fwrite (&tpclnt, sizeof (tpclnt), 1, fTPC);
(void)sim_fwrite (buf, 1, 1, fP7B);
for (j=0; j<records; j++) {
    memset (buf, j, 10240);
    (void)sim_fwrite (buf, 1, 10240, fTAR);
    (void)sim_fwrite (buf, 1, 10240, fTAR2);
    }
memset (buf, j, 10240);
(void)sim_fwrite (buf, 1, 5120, fTAR2);
Done_Files:
if (fSIMH)
    fclose (fSIMH);
if (fE11)
    fclose (fE11);
if (fTPC)
    fclose (fTPC);
if (fP7B)
    fclose (fP7B);
if (fAWS)
    fclose (fAWS);
if (fTAR)
    fclose (fTAR);
if (fTAR2)
    fclose (fTAR2);
free (buf);
sim_tape_detach (uptr);
if (stat == SCPE_OK) {
    char name1[CBUFSIZE], name2[CBUFSIZE];

    sprintf (name1, "\"%s.aws\"", filename);
    sprintf (name2, "\"%s.aws.tape\"", filename);
    sim_switches = SWMASK ('F');
    if (sim_cmp_string (name1, name2))
        stat = 1;
    }
sim_switches = saved_switches;
return stat;
}

static t_stat sim_tape_test_process_tape_file (UNIT *uptr, const char *filename, const char *format)
{
char args[256];
t_stat stat;

sprintf (args, "%s %s.%s", format, filename, format);
sim_tape_detach (uptr);
sim_switches |= SWMASK ('F') | SWMASK ('V');
stat = sim_tape_attach_ex (uptr, args, 0, 0);
if (stat != SCPE_OK)
    return stat;
sim_tape_detach (uptr);
sim_switches = 0;
return SCPE_OK;
}

static t_stat sim_tape_test_remove_tape_files (UNIT *uptr, const char *filename)
{
char name[256];

sprintf (name, "%s.simh", filename);
(void)remove (name);
sprintf (name, "%s.e11", filename);
(void)remove (name);
sprintf (name, "%s.tpc", filename);
(void)remove (name);
sprintf (name, "%s.p7b", filename);
(void)remove (name);
sprintf (name, "%s.aws", filename);
(void)remove (name);
sprintf (name, "%s.tar", filename);
(void)remove (name);
sprintf (name, "%s.2.tar", filename);
(void)remove (name);
return SCPE_OK;
}

static t_stat sim_tape_test_density_string (void)
{
char buf[128];
int32 valid_bits = 0;
t_stat stat;

if ((SCPE_ARG != (stat = sim_tape_density_supported (buf, sizeof (buf), valid_bits))) ||
    (strcmp (buf, "")))
    return stat;
valid_bits = MT_556_VALID;
if ((SCPE_OK != (stat = sim_tape_density_supported (buf, sizeof (buf), valid_bits))) || 
    (strcmp (buf, "556")))
    return sim_messagef (SCPE_ARG, "stat was: %s, got string: %s\n", sim_error_text (stat), buf);
valid_bits = MT_800_VALID | MT_1600_VALID;
if ((SCPE_OK != (stat = sim_tape_density_supported (buf, sizeof (buf), valid_bits))) || 
    (strcmp (buf, "{800|1600}")))
    return sim_messagef (SCPE_ARG, "stat was: %s, got string: %s\n", sim_error_text (stat), buf);
valid_bits = MT_800_VALID | MT_1600_VALID | MT_6250_VALID;
if ((SCPE_OK != (stat = sim_tape_density_supported (buf, sizeof (buf), valid_bits))) || 
    (strcmp (buf, "{800|1600|6250}")))
    return sim_messagef (SCPE_ARG, "stat was: %s, got string: %s\n", sim_error_text (stat), buf);
valid_bits = MT_200_VALID | MT_800_VALID | MT_1600_VALID | MT_6250_VALID;
if ((SCPE_OK != (stat = sim_tape_density_supported (buf, sizeof (buf), valid_bits))) || 
    (strcmp (buf, "{200|800|1600|6250}")))
    return sim_messagef (SCPE_ARG, "stat was: %s, got string: %s\n", sim_error_text (stat), buf);
valid_bits = MT_NONE_VALID | MT_800_VALID | MT_1600_VALID | MT_6250_VALID;
if ((SCPE_OK != (stat = sim_tape_density_supported (buf, sizeof (buf), valid_bits))) || 
    (strcmp (buf, "{0|800|1600|6250}")))
    return sim_messagef (SCPE_ARG, "stat was: %s, got string: %s\n", sim_error_text (stat), buf);
return SCPE_OK;
}

#include <setjmp.h>

t_stat sim_tape_test (DEVICE *dptr)
{
int32 saved_switches = sim_switches;
SIM_TEST_INIT;

sim_printf ("\nTesting %s device sim_tape APIs\n", sim_uname(dptr->units));

SIM_TEST(sim_tape_test_density_string ());

SIM_TEST(sim_tape_test_remove_tape_files (dptr->units, "TapeTestFile1"));

SIM_TEST(sim_tape_test_create_tape_files (dptr->units, "TapeTestFile1", 2, 5, 4096));

sim_switches = saved_switches;
SIM_TEST(sim_tape_test_process_tape_file (dptr->units, "TapeTestFile1", "tar"));

sim_switches = saved_switches;
SIM_TEST(sim_tape_test_process_tape_file (dptr->units, "TapeTestFile1.2", "tar"));

sim_switches = saved_switches;
SIM_TEST(sim_tape_test_process_tape_file (dptr->units, "TapeTestFile1", "aws"));

sim_switches = saved_switches;
SIM_TEST(sim_tape_test_process_tape_file (dptr->units, "TapeTestFile1", "p7b"));

sim_switches = saved_switches;
SIM_TEST(sim_tape_test_process_tape_file (dptr->units, "TapeTestFile1", "tpc"));

sim_switches = saved_switches;
SIM_TEST(sim_tape_test_process_tape_file (dptr->units, "TapeTestFile1", "e11"));

sim_switches = saved_switches;
SIM_TEST(sim_tape_test_process_tape_file (dptr->units, "TapeTestFile1", "simh"));

SIM_TEST(sim_tape_test_remove_tape_files (dptr->units, "TapeTestFile1"));

return SCPE_OK;
}

Changes to src/SIMH/sim_tape.h.

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#define MTR_RRGAP       0xFFFFFFFF                      /* reverse read half gap */
#define MTR_FHGAP       0xFFFEFFFF                      /* fwd half gap (overwrite) */
#define MTR_RHGAP       0xFFFF0000                      /* rev half gap (overwrite) */
#define MTR_M_RHGAP     (~0x000080FF)                   /* range mask for rev gap */
#define MTR_MAXLEN      0x00FFFFFF                      /* max len is 24b */
#define MTR_ERF         0x80000000                      /* error flag */
#define MTR_F(x)        ((x) & MTR_ERF)                 /* record error flg */
#define MTR_L(x)        ((x) & ~MTR_ERF)                /* record length */

/* TPC tape format */

typedef uint16          t_tpclnt;                       /* magtape rec lnt */





/* P7B tape format */

#define P7B_SOR         0x80                            /* start of record */
#define P7B_PAR         0x40                            /* parity */
#define P7B_DATA        0x3F                            /* data */
#define P7B_DPAR        (P7B_PAR|P7B_DATA)              /* data and parity */
#define P7B_EOF         0x0F                            /* eof character */

#define TPC_TMK         0x0000                          /* tape mark */












/* Unit flags */

#define MTUF_V_PNU      (UNIT_V_UF + 0)                 /* position not upd */
#define MTUF_V_WLK      (UNIT_V_UF + 1)                 /* write locked */
#define MTUF_V_FMT      (UNIT_V_UF + 2)                 /* tape file format */
#define MTUF_W_FMT      3                               /* 3b of formats */
#define MTUF_N_FMT      (1u << MTUF_W_FMT)              /* number of formats */
#define MTUF_M_FMT      ((1u << MTUF_W_FMT) - 1)
#define MTUF_F_STD       0                              /* SIMH format */
#define MTUF_F_E11       1                              /* E11 format */
#define MTUF_F_TPC       2                              /* TPC format */
#define MTUF_F_P7B       3                              /* P7B format */
#define MUTF_F_TDF       4                              /* TDF format */

#define MTUF_V_UF       (MTUF_V_FMT + MTUF_W_FMT)
#define MTUF_PNU        (1u << MTUF_V_PNU)
#define MTUF_WLK        (1u << MTUF_V_WLK)
#define MTUF_FMT        (MTUF_M_FMT << MTUF_V_FMT)
#define MTUF_WRP        (MTUF_WLK | UNIT_RO)

#define MT_F_STD        (MTUF_F_STD << MTUF_V_FMT)
#define MT_F_E11        (MTUF_F_E11 << MTUF_V_FMT)
#define MT_F_TPC        (MTUF_F_TPC << MTUF_V_FMT)
#define MT_F_P7B        (MTUF_F_P7B << MTUF_V_FMT)
#define MT_F_TDF        (MTUF_F_TDF << MTUF_V_FMT)


#define MT_SET_PNU(u)   (u)->flags = (u)->flags | MTUF_PNU
#define MT_CLR_PNU(u)   (u)->flags = (u)->flags & ~MTUF_PNU
#define MT_TST_PNU(u)   ((u)->flags & MTUF_PNU)



#define MT_GET_FMT(u)   (((u)->flags >> MTUF_V_FMT) & MTUF_M_FMT)

/* sim_tape_position Position Flags */
#define MTPOS_V_REW     3
#define MTPOS_M_REW     (1u << MTPOS_V_REW)            /* Rewind First */
#define MTPOS_V_REV     2
#define MTPOS_M_REV     (1u << MTPOS_V_REV)            /* Reverse Direction */
................................................................................
#define MTSE_FMT        5                               /* invalid format */
#define MTSE_BOT        6                               /* beginning of tape */
#define MTSE_EOM        7                               /* end of medium */
#define MTSE_RECE       8                               /* error in record */
#define MTSE_WRP        9                               /* write protected */
#define MTSE_LEOT       10                              /* Logical End Of Tape */
#define MTSE_RUNAWAY    11                              /* tape runaway */


typedef void (*TAPE_PCALLBACK)(UNIT *unit, t_stat status);

/* Tape Internal Debug flags */


#define MTSE_DBG_DAT   0x20000000                       /* Debug Data */
#define MTSE_DBG_POS   0x40000000                       /* Debug Positioning activities */
#define MTSE_DBG_STR   0x80000000                       /* Debug Tape Structure */

/* Prototypes */

t_stat sim_tape_attach_ex (UNIT *uptr, const char *cptr, uint32 dbit, int completion_delay);
................................................................................
t_bool sim_tape_eot (UNIT *uptr);
t_stat sim_tape_set_fmt (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
t_stat sim_tape_show_fmt (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
t_stat sim_tape_set_capac (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
t_stat sim_tape_show_capac (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
t_stat sim_tape_set_dens (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
t_stat sim_tape_show_dens (FILE *st, UNIT *uptr, int32 val, CONST void *desc);

t_stat sim_tape_set_asynch (UNIT *uptr, int latency);
t_stat sim_tape_clr_asynch (UNIT *uptr);
t_stat sim_tape_test (DEVICE *dptr);


#ifdef  __cplusplus
}
#endif

#endif







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#define MTR_RRGAP       0xFFFFFFFF                      /* reverse read half gap */
#define MTR_FHGAP       0xFFFEFFFF                      /* fwd half gap (overwrite) */
#define MTR_RHGAP       0xFFFF0000                      /* rev half gap (overwrite) */
#define MTR_M_RHGAP     (~0x000080FF)                   /* range mask for rev gap */
#define MTR_MAXLEN      0x00FFFFFF                      /* max len is 24b */
#define MTR_ERF         0x80000000                      /* error flag */
#define MTR_F(x)        ((x) & MTR_ERF)                 /* record error flg */
#define MTR_L(x)        ((t_mtrlnt)((x) & ~MTR_ERF))    /* record length */

/* TPC tape format */

typedef uint16          t_tpclnt;                       /* magtape rec lnt */

#define TPC_TMK         0x0000                          /* tape mark */
#define TPC_EOM         0xFFFF                          /* end of medium */


/* P7B tape format */

#define P7B_SOR         0x80                            /* start of record */
#define P7B_PAR         0x40                            /* parity */
#define P7B_DATA        0x3F                            /* data */
#define P7B_DPAR        (P7B_PAR|P7B_DATA)              /* data and parity */
#define P7B_EOF         0x0F                            /* eof character */

/* AWS tape format */
typedef uint16          t_awslnt;                       /* magtape rec lnt */
typedef struct {
    t_awslnt    nxtlen;
    t_awslnt    prelen;
    t_awslnt    rectyp;
#define AWS_TMK         0x0040
#define AWS_REC         0x00A0
    } t_awshdr;

/* TAR tape format */
#define TAR_DFLT_RECSIZE     10240                      /* Default Fixed record size */

/* Unit flags */

#define MTUF_V_PNU      (UNIT_V_UF + 0)                 /* position not upd */
#define MTUF_V_WLK      (UNIT_V_UF + 1)                 /* write locked */
#define MTUF_V_FMT      (UNIT_V_UF + 2)                 /* tape file format */
#define MTUF_W_FMT      3                               /* 3b of formats */
#define MTUF_N_FMT      (1u << MTUF_W_FMT)              /* number of formats */
#define MTUF_M_FMT      ((1u << MTUF_W_FMT) - 1)
#define MTUF_F_STD       0                              /* SIMH format */
#define MTUF_F_E11       1                              /* E11 format */
#define MTUF_F_TPC       2                              /* TPC format */
#define MTUF_F_P7B       3                              /* P7B format */
#define MTUF_F_AWS       4                              /* AWS format */
#define MTUF_F_TAR       5                              /* TAR format */
#define MTUF_V_UF       (MTUF_V_FMT + MTUF_W_FMT)
#define MTUF_PNU        (1u << MTUF_V_PNU)
#define MTUF_WLK        (1u << MTUF_V_WLK)
#define MTUF_FMT        (MTUF_M_FMT << MTUF_V_FMT)
#define MTUF_WRP        (MTUF_WLK | UNIT_RO)

#define MT_F_STD        (MTUF_F_STD << MTUF_V_FMT)
#define MT_F_E11        (MTUF_F_E11 << MTUF_V_FMT)
#define MT_F_TPC        (MTUF_F_TPC << MTUF_V_FMT)
#define MT_F_P7B        (MTUF_F_P7B << MTUF_V_FMT)
#define MT_F_AWS        (MTUF_F_AWS << MTUF_V_FMT)
#define MT_F_TAR        (MTUF_F_TAR << MTUF_V_FMT)

#define MT_SET_PNU(u)   (u)->flags = (u)->flags | MTUF_PNU
#define MT_CLR_PNU(u)   (u)->flags = (u)->flags & ~MTUF_PNU
#define MT_TST_PNU(u)   ((u)->flags & MTUF_PNU)
#define MT_SET_INMRK(u) (u)->dynflags = (u)->dynflags | UNIT_TAPE_MRK
#define MT_CLR_INMRK(u) (u)->dynflags = (u)->dynflags & ~UNIT_TAPE_MRK
#define MT_TST_INMRK(u) ((u)->dynflags & UNIT_TAPE_MRK)
#define MT_GET_FMT(u)   (((u)->flags >> MTUF_V_FMT) & MTUF_M_FMT)

/* sim_tape_position Position Flags */
#define MTPOS_V_REW     3
#define MTPOS_M_REW     (1u << MTPOS_V_REW)            /* Rewind First */
#define MTPOS_V_REV     2
#define MTPOS_M_REV     (1u << MTPOS_V_REV)            /* Reverse Direction */
................................................................................
#define MTSE_FMT        5                               /* invalid format */
#define MTSE_BOT        6                               /* beginning of tape */
#define MTSE_EOM        7                               /* end of medium */
#define MTSE_RECE       8                               /* error in record */
#define MTSE_WRP        9                               /* write protected */
#define MTSE_LEOT       10                              /* Logical End Of Tape */
#define MTSE_RUNAWAY    11                              /* tape runaway */
#define MTSE_MAX_ERR    11

typedef void (*TAPE_PCALLBACK)(UNIT *unit, t_stat status);

/* Tape Internal Debug flags */

#define MTSE_DBG_API   0x10000000                       /* API Trace */
#define MTSE_DBG_DAT   0x20000000                       /* Debug Data */
#define MTSE_DBG_POS   0x40000000                       /* Debug Positioning activities */
#define MTSE_DBG_STR   0x80000000                       /* Debug Tape Structure */

/* Prototypes */

t_stat sim_tape_attach_ex (UNIT *uptr, const char *cptr, uint32 dbit, int completion_delay);
................................................................................
t_bool sim_tape_eot (UNIT *uptr);
t_stat sim_tape_set_fmt (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
t_stat sim_tape_show_fmt (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
t_stat sim_tape_set_capac (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
t_stat sim_tape_show_capac (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
t_stat sim_tape_set_dens (UNIT *uptr, int32 val, CONST char *cptr, void *desc);
t_stat sim_tape_show_dens (FILE *st, UNIT *uptr, int32 val, CONST void *desc);
t_stat sim_tape_density_supported (char *string, size_t string_size, int32 valid_bits);
t_stat sim_tape_set_asynch (UNIT *uptr, int latency);
t_stat sim_tape_clr_asynch (UNIT *uptr);
t_stat sim_tape_test (DEVICE *dptr);
t_stat sim_tape_add_debug (DEVICE *dptr);

#ifdef  __cplusplus
}
#endif

#endif

Changes to src/SIMH/sim_tmxr.c.

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    lp = mp->ldsc + i;                                  /* get line desc */
    if (lp->rxbpi == lp->rxbpr)                         /* if buf empty, */
        lp->rxbpi = lp->rxbpr = 0;                      /* reset pointers */
    }                                                   /* end for */
}


int32 tmxr_rqln_bare (const TMLN *lp, t_bool speed)
{
if (speed) {
    if (lp->send.extoff < lp->send.insoff) {/* buffered SEND data? */
        if (sim_gtime () < lp->send.next_time) 
            return 0;
        else
            return lp->send.delay ? 1 : (lp->send.insoff - lp->send.extoff);
        }
    if (lp->rxbps) {                        /* consider speed and rate limiting? */
        if (sim_gtime () < lp->rxnexttime)  /* too soon? */
            return 0;
        else
            return 1;
        }
    }
return (lp->rxbpi - lp->rxbpr + ((lp->rxbpi < lp->rxbpr)? lp->rxbsz: 0));
}

/* Return count of available characters ready to be read for line */

int32 tmxr_rqln (const TMLN *lp)
{
return tmxr_rqln_bare (lp, TRUE);
................................................................................
  {"EXPECT",    TMXR_DBG_EXP,       "Expect Activities"},
  {"SEND",      TMXR_DBG_SEND,      "Send Activities"},
  {0}
};

t_stat tmxr_add_debug (DEVICE *dptr)
{
if (!(dptr->flags & DEV_MUX))
    return SCPE_OK;
return sim_add_debug_flags (dptr, tmxr_debug);
}

/* Attach unit to master socket */

t_stat tmxr_attach_ex (TMXR *mp, UNIT *uptr, CONST char *cptr, t_bool async)







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    lp = mp->ldsc + i;                                  /* get line desc */
    if (lp->rxbpi == lp->rxbpr)                         /* if buf empty, */
        lp->rxbpi = lp->rxbpr = 0;                      /* reset pointers */
    }                                                   /* end for */
}


static int32 tmxr_rqln_bare (const TMLN *lp, t_bool speed)
{
if (speed) {
    if (lp->send.extoff < lp->send.insoff) {/* buffered SEND data? */
        if (sim_gtime () < lp->send.next_time) /* too soon? */
            return 0;
        else
            return 1;
        }
    if (lp->rxbps) {                        /* consider speed and rate limiting? */
        if (sim_gtime () < lp->rxnexttime)  /* too soon? */
            return 0;
        else
            return ((lp->rxbpi - lp->rxbpr + ((lp->rxbpi < lp->rxbpr)? lp->rxbsz : 0)) > 0) ? 1 : 0;
        }
    }
return (lp->rxbpi - lp->rxbpr + ((lp->rxbpi < lp->rxbpr)? lp->rxbsz : 0));
}

/* Return count of available characters ready to be read for line */

int32 tmxr_rqln (const TMLN *lp)
{
return tmxr_rqln_bare (lp, TRUE);
................................................................................
  {"EXPECT",    TMXR_DBG_EXP,       "Expect Activities"},
  {"SEND",      TMXR_DBG_SEND,      "Send Activities"},
  {0}
};

t_stat tmxr_add_debug (DEVICE *dptr)
{
if (DEV_TYPE(dptr) != DEV_MUX)
    return SCPE_OK;
return sim_add_debug_flags (dptr, tmxr_debug);
}

/* Attach unit to master socket */

t_stat tmxr_attach_ex (TMXR *mp, UNIT *uptr, CONST char *cptr, t_bool async)

Changes to src/SIMH/sim_video.c.

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SDL_Surface *vid_image;                                 /* video buffer */
SDL_Surface *vid_window;                                /* window handle */
#else
t_bool vid_key_state[SDL_NUM_SCANCODES];
SDL_Texture *vid_texture;                               /* video buffer in GPU */
SDL_Renderer *vid_renderer;
SDL_Window *vid_window;                                 /* window handle */

uint32 vid_windowID;
#endif
SDL_Thread *vid_thread_handle = NULL;                   /* event thread handle */
SDL_Cursor *vid_cursor = NULL;                          /* current cursor */
t_bool vid_cursor_visible = FALSE;                      /* cursor visibility state */
uint32 vid_mono_palette[2];                             /* Monochrome Color Map */
SDL_Color vid_colors[256];
KEY_EVENT_QUEUE vid_key_events;                         /* keyboard events */
MOUSE_EVENT_QUEUE vid_mouse_events;                     /* mouse events */
DEVICE *vid_dev;

#if defined (SDL_MAIN_AVAILABLE)
#if defined (main)
#undef main
................................................................................
            }
        }
    if (SDL_SemPost (vid_mouse_events.sem))
        sim_printf ("%s: vid_poll_mouse(): SDL_SemPost error: %s\n", sim_dname(vid_dev), SDL_GetError());
    }
return stat;
}










void vid_draw (int32 x, int32 y, int32 w, int32 h, uint32 *buf)
{
#if SDL_MAJOR_VERSION == 1
int32 i;
uint32* pixels;

................................................................................
     */
    eventtypes[SDL_USEREVENT] = "USEREVENT";
#endif  /* SDL_MAJOR_VERSION != 1 */
    }

sim_debug (SIM_VID_DBG_VIDEO|SIM_VID_DBG_KEY|SIM_VID_DBG_MOUSE, vid_dev, "vid_thread() - Starting\n");

vid_mono_palette[0] = sim_end ? 0xFF000000 : 0x000000FF;        /* Black */
vid_mono_palette[1] = 0xFFFFFFFF;                               /* White */

memset (&vid_key_state, 0, sizeof(vid_key_state));

#if SDL_MAJOR_VERSION == 1
vid_window = SDL_SetVideoMode (vid_width, vid_height, 8, 0);

SDL_EnableKeyRepeat (SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);

................................................................................
    vid_renderer = NULL;
    SDL_DestroyWindow(vid_window);
    vid_window = NULL;
    SDL_Quit ();
    return 0;
    }



SDL_StopTextInput ();

vid_windowID = SDL_GetWindowID (vid_window);

#endif

if (vid_flags & SIM_VID_INPUTCAPTURED) {
    char title[150];

    memset (title, 0, sizeof(title));
    strncpy (title, vid_title, sizeof(title)-1);
    strncat (title, "                                             ReleaseKey=", sizeof(title)-(1+strlen(title)));
    strncat (title, vid_release_key, sizeof(title)-(1+strlen(title)));
#if SDL_MAJOR_VERSION == 1
    SDL_WM_SetCaption (title, title);
#else
    SDL_SetWindowTitle (vid_window, title);
#endif
    }
else
................................................................................
#endif
SDL_Delay (vid_beep_duration + 100);/* Wait for sound to finnish */
}

#else /* !(defined(USE_SIM_VIDEO) && defined(HAVE_LIBSDL)) */
/* Non-implemented versions */

uint32 vid_mono_palette[2];                             /* Monochrome Color Map */

t_stat vid_open (DEVICE *dptr, const char *title, uint32 width, uint32 height, int flags)
{
return SCPE_NOFNC;
}

t_stat vid_close (void)
{
................................................................................
return SCPE_EOF;
}

t_stat vid_poll_mouse (SIM_MOUSE_EVENT *ev)
{
return SCPE_EOF;
}






void vid_draw (int32 x, int32 y, int32 w, int32 h, uint32 *buf)
{
return;
}

t_stat vid_set_cursor (t_bool visible, uint32 width, uint32 height, uint8 *data, uint8 *mask, uint32 hot_x, uint32 hot_y)







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SDL_Surface *vid_image;                                 /* video buffer */
SDL_Surface *vid_window;                                /* window handle */
#else
t_bool vid_key_state[SDL_NUM_SCANCODES];
SDL_Texture *vid_texture;                               /* video buffer in GPU */
SDL_Renderer *vid_renderer;
SDL_Window *vid_window;                                 /* window handle */
SDL_PixelFormat *vid_format;
uint32 vid_windowID;
#endif
SDL_Thread *vid_thread_handle = NULL;                   /* event thread handle */
SDL_Cursor *vid_cursor = NULL;                          /* current cursor */
t_bool vid_cursor_visible = FALSE;                      /* cursor visibility state */


KEY_EVENT_QUEUE vid_key_events;                         /* keyboard events */
MOUSE_EVENT_QUEUE vid_mouse_events;                     /* mouse events */
DEVICE *vid_dev;

#if defined (SDL_MAIN_AVAILABLE)
#if defined (main)
#undef main
................................................................................
            }
        }
    if (SDL_SemPost (vid_mouse_events.sem))
        sim_printf ("%s: vid_poll_mouse(): SDL_SemPost error: %s\n", sim_dname(vid_dev), SDL_GetError());
    }
return stat;
}

uint32 vid_map_rgb (uint8 r, uint8 g, uint8 b)
{
#if SDL_MAJOR_VERSION == 1
return SDL_MapRGB (vid_image->format, r, g, b);
#else
return SDL_MapRGB (vid_format, r, g, b);
#endif
}

void vid_draw (int32 x, int32 y, int32 w, int32 h, uint32 *buf)
{
#if SDL_MAJOR_VERSION == 1
int32 i;
uint32* pixels;

................................................................................
     */
    eventtypes[SDL_USEREVENT] = "USEREVENT";
#endif  /* SDL_MAJOR_VERSION != 1 */
    }

sim_debug (SIM_VID_DBG_VIDEO|SIM_VID_DBG_KEY|SIM_VID_DBG_MOUSE, vid_dev, "vid_thread() - Starting\n");




memset (&vid_key_state, 0, sizeof(vid_key_state));

#if SDL_MAJOR_VERSION == 1
vid_window = SDL_SetVideoMode (vid_width, vid_height, 8, 0);

SDL_EnableKeyRepeat (SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);

................................................................................
    vid_renderer = NULL;
    SDL_DestroyWindow(vid_window);
    vid_window = NULL;
    SDL_Quit ();
    return 0;
    }

vid_format = SDL_AllocFormat (SDL_PIXELFORMAT_ARGB8888);

SDL_StopTextInput ();

vid_windowID = SDL_GetWindowID (vid_window);

#endif

if (vid_flags & SIM_VID_INPUTCAPTURED) {
    char title[150];

    memset (title, 0, sizeof(title));
    strlcpy (title, vid_title, sizeof(title));
    strlcat (title, "                                             ReleaseKey=", sizeof(title));
    strlcat (title, vid_release_key, sizeof(title));
#if SDL_MAJOR_VERSION == 1
    SDL_WM_SetCaption (title, title);
#else
    SDL_SetWindowTitle (vid_window, title);
#endif
    }
else
................................................................................
#endif
SDL_Delay (vid_beep_duration + 100);/* Wait for sound to finnish */
}

#else /* !(defined(USE_SIM_VIDEO) && defined(HAVE_LIBSDL)) */
/* Non-implemented versions */



t_stat vid_open (DEVICE *dptr, const char *title, uint32 width, uint32 height, int flags)
{
return SCPE_NOFNC;
}

t_stat vid_close (void)
{
................................................................................
return SCPE_EOF;
}

t_stat vid_poll_mouse (SIM_MOUSE_EVENT *ev)
{
return SCPE_EOF;
}

uint32 vid_map_rgb (uint8 r, uint8 g, uint8 b)
{
return 0;
}

void vid_draw (int32 x, int32 y, int32 w, int32 h, uint32 *buf)
{
return;
}

t_stat vid_set_cursor (t_bool visible, uint32 width, uint32 height, uint8 *data, uint8 *mask, uint32 hot_x, uint32 hot_y)

Changes to src/SIMH/sim_video.h.

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#define SIM_VID_INPUTCAPTURED       1                       /* Mouse and Keyboard input captured (calling */
                                                            /* code responsible for cursor display in video) */
typedef void (*VID_QUIT_CALLBACK)(void);
t_stat vid_register_quit_callback (VID_QUIT_CALLBACK callback);
t_stat vid_close (void);
t_stat vid_poll_kb (SIM_KEY_EVENT *ev);
t_stat vid_poll_mouse (SIM_MOUSE_EVENT *ev);

void vid_draw (int32 x, int32 y, int32 w, int32 h, uint32 *buf);
void vid_beep (void);
void vid_refresh (void);
const char *vid_version (void);
const char *vid_key_name (int32 key);
t_stat vid_set_cursor (t_bool visible, uint32 width, uint32 height, uint8 *data, uint8 *mask, uint32 hot_x, uint32 hot_y);
t_stat vid_set_release_key (FILE* st, UNIT* uptr, int32 val, CONST void* desc);
t_stat vid_show_release_key (FILE* st, UNIT* uptr, int32 val, CONST void* desc);
t_stat vid_show_video (FILE* st, UNIT* uptr, int32 val, CONST void* desc);
t_stat vid_show (FILE* st, DEVICE *dptr,  UNIT* uptr, int32 val, CONST char* desc);
t_stat vid_screenshot (const char *filename);

extern t_bool vid_active;
extern uint32 vid_mono_palette[2];
void vid_set_cursor_position (int32 x, int32 y);        /* cursor position (set by calling code) */

/* A device simulator can optionally set the vid_display_kb_event_process
 * routine pointer to the address of a routine.
 * Simulator code which uses the display library which processes window 
 * keyboard data with code in display/sim_ws.c can use this routine to
 * explicitly get access to keyboard events that arrive in the display 







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#define SIM_VID_INPUTCAPTURED       1                       /* Mouse and Keyboard input captured (calling */
                                                            /* code responsible for cursor display in video) */
typedef void (*VID_QUIT_CALLBACK)(void);
t_stat vid_register_quit_callback (VID_QUIT_CALLBACK callback);
t_stat vid_close (void);
t_stat vid_poll_kb (SIM_KEY_EVENT *ev);
t_stat vid_poll_mouse (SIM_MOUSE_EVENT *ev);
uint32 vid_map_rgb (uint8 r, uint8 g, uint8 b);
void vid_draw (int32 x, int32 y, int32 w, int32 h, uint32 *buf);
void vid_beep (void);
void vid_refresh (void);
const char *vid_version (void);
const char *vid_key_name (int32 key);
t_stat vid_set_cursor (t_bool visible, uint32 width, uint32 height, uint8 *data, uint8 *mask, uint32 hot_x, uint32 hot_y);
t_stat vid_set_release_key (FILE* st, UNIT* uptr, int32 val, CONST void* desc);
t_stat vid_show_release_key (FILE* st, UNIT* uptr, int32 val, CONST void* desc);
t_stat vid_show_video (FILE* st, UNIT* uptr, int32 val, CONST void* desc);
t_stat vid_show (FILE* st, DEVICE *dptr,  UNIT* uptr, int32 val, CONST char* desc);
t_stat vid_screenshot (const char *filename);

extern t_bool vid_active;

void vid_set_cursor_position (int32 x, int32 y);        /* cursor position (set by calling code) */

/* A device simulator can optionally set the vid_display_kb_event_process
 * routine pointer to the address of a routine.
 * Simulator code which uses the display library which processes window 
 * keyboard data with code in display/sim_ws.c can use this routine to
 * explicitly get access to keyboard events that arrive in the display