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sim_tape.c
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sim_tape.c
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/* sim_tape.c: simulator tape support library
Copyright (c) 1993-2008, Robert M Supnik
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 the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
Ultimately, this will be a place to hide processing of various tape formats,
as well as OS-specific direct hardware access.
23-Jan-12 MP Added support for Logical EOT detection while positioning
05-Feb-11 MP Refactored to prepare for SIM_ASYNC_IO support
Added higher level routines:
sim_tape_wreomrw - erase remainder of tape & rewind
sim_tape_sprecsf - skip records
sim_tape_spfilef - skip files
sim_tape_sprecsr - skip records rev
sim_tape_spfiler - skip files rev
sim_tape_position - general purpose position
These routines correspond to natural tape operations
and will align better when physical tape support is
included here.
08-Jun-08 JDB Fixed signed/unsigned warning in sim_tape_set_fmt
23-Jan-07 JDB Fixed backspace over gap at BOT
22-Jan-07 RMS Fixed bug in P7B format read reclnt rev (found by Rich Cornwell)
15-Dec-06 RMS Added support for small capacity tapes
30-Aug-06 JDB Added erase gap support
14-Feb-06 RMS Added variable tape capacity
23-Jan-06 JDB Fixed odd-byte-write problem in sim_tape_wrrecf
17-Dec-05 RMS Added write support for Paul Pierce 7b format
16-Aug-05 RMS Fixed C++ declaration and cast problems
02-May-05 RMS Added support for Pierce 7b format
28-Jul-04 RMS Fixed bug in writing error records (found by Dave Bryan)
RMS Fixed incorrect error codes (found by Dave Bryan)
05-Jan-04 RMS Revised for file I/O library
25-Apr-03 RMS Added extended file support
28-Mar-03 RMS Added E11 and TPC format support
Public routines:
sim_tape_attach attach tape unit
sim_tape_detach detach tape unit
sim_tape_attach_help help routine for attaching tapes
sim_tape_rdrecf read tape record forward
sim_tape_rdrecr read tape record reverse
sim_tape_wrrecf write tape record forward
sim_tape_sprecf space tape record forward
sim_tape_sprecr space tape record reverse
sim_tape_wrtmk write tape mark
sim_tape_wreom erase remainder of tape
sim_tape_wreomrw erase remainder of tape & rewind
sim_tape_wrgap write erase gap
sim_tape_sprecsf space records forward
sim_tape_spfilef space files forward
sim_tape_sprecsr space records reverse
sim_tape_spfiler space files reverse
sim_tape_position generalized position
sim_tape_rewind rewind
sim_tape_reset reset unit
sim_tape_bot TRUE if at beginning of tape
sim_tape_eot TRUE if at or beyond end of tape
sim_tape_wrp TRUE if write protected
sim_tape_set_fmt set tape format
sim_tape_show_fmt show tape format
sim_tape_set_capac set tape capacity
sim_tape_show_capac show tape capacity
sim_tape_set_async enable asynchronous operation
sim_tape_clr_async disable asynchronous operation
*/
#include "sim_defs.h"
#include "sim_tape.h"
#include <ctype.h>
#if defined SIM_ASYNCH_IO
#include <pthread.h>
#endif
struct sim_tape_fmt {
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 }
};
t_stat sim_tape_ioerr (UNIT *uptr);
t_stat sim_tape_wrdata (UNIT *uptr, uint32 dat);
uint32 sim_tape_tpc_map (UNIT *uptr, t_addr *map);
t_addr sim_tape_tpc_fnd (UNIT *uptr, t_addr *map);
struct tape_context {
DEVICE *dptr; /* Device for unit (access to debug flags) */
uint32 dbit; /* debugging bit */
#if defined SIM_ASYNCH_IO
int asynch_io; /* Asynchronous Interrupt scheduling enabled */
int asynch_io_latency; /* instructions to delay pending interrupt */
pthread_mutex_t lock;
pthread_t io_thread; /* I/O Thread Id */
pthread_mutex_t io_lock;
pthread_cond_t io_cond;
pthread_cond_t io_done;
pthread_cond_t startup_cond;
int io_top;
uint8 *buf;
uint32 *bc;
uint32 *fc;
uint32 vbc;
uint32 max;
uint32 gaplen;
uint32 bpi;
uint32 *objupdate;
TAPE_PCALLBACK callback;
t_stat io_status;
#endif
};
#define tape_ctx up8 /* Field in Unit structure which points to the tape_context */
#if defined SIM_ASYNCH_IO
#define AIO_CALLSETUP \
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx; \
\
if ((!callback) || !ctx->asynch_io)
#define AIO_CALL(op, _buf, _bc, _fc, _max, _vbc, _gaplen, _bpi, _obj, _callback)\
if (ctx->asynch_io) { \
struct tape_context *ctx = \
(struct tape_context *)uptr->tape_ctx; \
\
pthread_mutex_lock (&ctx->io_lock); \
\
sim_debug (ctx->dbit, ctx->dptr, \
"sim_tape AIO_CALL(op=%d, unit=%d)\n", op, uptr-ctx->dptr->units);\
\
if (ctx->callback) \
abort(); /* horrible mistake, stop */ \
ctx->io_top = op; \
ctx->buf = _buf; \
ctx->bc = _bc; \
ctx->fc = _fc; \
ctx->max = _max; \
ctx->vbc = _vbc; \
ctx->gaplen = _gaplen; \
ctx->bpi = _bpi; \
ctx->objupdate = _obj; \
ctx->callback = _callback; \
pthread_cond_signal (&ctx->io_cond); \
pthread_mutex_unlock (&ctx->io_lock); \
} \
else \
if (_callback) \
(_callback) (uptr, r);
#define TOP_DONE 0 /* close */
#define TOP_RDRF 1 /* sim_tape_rdrecf_a */
#define TOP_RDRR 2 /* sim_tape_rdrecr_a */
#define TOP_WREC 3 /* sim_tape_wrrecf_a */
#define TOP_WTMK 4 /* sim_tape_wrtmk_a */
#define TOP_WEOM 5 /* sim_tape_wreom_a */
#define TOP_WEMR 6 /* sim_tape_wreomrw_a */
#define TOP_WGAP 7 /* sim_tape_wrgap_a */
#define TOP_SPRF 8 /* sim_tape_sprecf_a */
#define TOP_SRSF 9 /* sim_tape_sprecsf_a */
#define TOP_SPRR 10 /* sim_tape_sprecr_a */
#define TOP_SRSR 11 /* sim_tape_sprecsr_a */
#define TOP_SPFF 12 /* sim_tape_spfilef */
#define TOP_SFRF 13 /* sim_tape_spfilebyrecf */
#define TOP_SPFR 14 /* sim_tape_spfiler */
#define TOP_SFRR 15 /* sim_tape_spfilebyrecr */
#define TOP_RWND 16 /* sim_tape_rewind_a */
#define TOP_POSN 17 /* sim_tape_position_a */
static void *
_tape_io(void *arg)
{
UNIT* volatile uptr = (UNIT*)arg;
int sched_policy;
struct sched_param sched_priority;
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
/* Boost Priority for this I/O thread vs the CPU instruction execution
thread which in general won't be readily yielding the processor when
this thread needs to run */
pthread_getschedparam (pthread_self(), &sched_policy, &sched_priority);
++sched_priority.sched_priority;
pthread_setschedparam (pthread_self(), sched_policy, &sched_priority);
sim_debug (ctx->dbit, ctx->dptr, "_tape_io(unit=%d) starting\n", uptr-ctx->dptr->units);
pthread_mutex_lock (&ctx->io_lock);
pthread_cond_signal (&ctx->startup_cond); /* Signal we're ready to go */
while (1) {
pthread_cond_wait (&ctx->io_cond, &ctx->io_lock);
if (ctx->io_top == TOP_DONE)
break;
pthread_mutex_unlock (&ctx->io_lock);
switch (ctx->io_top) {
case TOP_RDRF:
ctx->io_status = sim_tape_rdrecf (uptr, ctx->buf, ctx->bc, ctx->max);
break;
case TOP_RDRR:
ctx->io_status = sim_tape_rdrecr (uptr, ctx->buf, ctx->bc, ctx->max);
break;
case TOP_WREC:
ctx->io_status = sim_tape_wrrecf (uptr, ctx->buf, ctx->vbc);
break;
case TOP_WTMK:
ctx->io_status = sim_tape_wrtmk (uptr);
break;
case TOP_WEOM:
ctx->io_status = sim_tape_wreom (uptr);
break;
case TOP_WEMR:
ctx->io_status = sim_tape_wreomrw (uptr);
break;
case TOP_WGAP:
ctx->io_status = sim_tape_wrgap (uptr, ctx->gaplen, ctx->bpi);
break;
case TOP_SPRF:
ctx->io_status = sim_tape_sprecf (uptr, ctx->bc);
break;
case TOP_SRSF:
ctx->io_status = sim_tape_sprecsf (uptr, ctx->vbc, ctx->bc);
break;
case TOP_SPRR:
ctx->io_status = sim_tape_sprecr (uptr, ctx->bc);
break;
case TOP_SRSR:
ctx->io_status = sim_tape_sprecsr (uptr, ctx->vbc, ctx->bc);
break;
case TOP_SPFF:
ctx->io_status = sim_tape_spfilef (uptr, ctx->vbc, ctx->bc);
break;
case TOP_SFRF:
ctx->io_status = sim_tape_spfilebyrecf (uptr, ctx->vbc, ctx->bc, ctx->fc, ctx->max);
break;
case TOP_SPFR:
ctx->io_status = sim_tape_spfiler (uptr, ctx->vbc, ctx->bc);
break;
case TOP_SFRR:
ctx->io_status = sim_tape_spfilebyrecr (uptr, ctx->vbc, ctx->bc, ctx->fc);
break;
case TOP_RWND:
ctx->io_status = sim_tape_rewind (uptr);
break;
case TOP_POSN:
ctx->io_status = sim_tape_position (uptr, ctx->vbc, ctx->gaplen, ctx->bc, ctx->bpi, ctx->fc, ctx->objupdate);
break;
}
pthread_mutex_lock (&ctx->io_lock);
ctx->io_top = TOP_DONE;
pthread_cond_signal (&ctx->io_done);
sim_activate (uptr, ctx->asynch_io_latency);
}
pthread_mutex_unlock (&ctx->io_lock);
sim_debug (ctx->dbit, ctx->dptr, "_tape_io(unit=%d) exiting\n", uptr-ctx->dptr->units);
return NULL;
}
/* This routine is called in the context of the main simulator thread before
processing events for any unit. It is only called when an asynchronous
thread has called sim_activate() to activate a unit. The job of this
routine is to put the unit in proper condition to digest what may have
occurred in the asynchronous thread.
Since tape processing only handles a single I/O at a time to a
particular tape device, we have the opportunity to possibly detect
improper attempts to issue multiple concurrent I/O requests. */
static void _tape_completion_dispatch (UNIT *uptr)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
TAPE_PCALLBACK callback = ctx->callback;
sim_debug (ctx->dbit, ctx->dptr, "_tape_completion_dispatch(unit=%d, top=%d, callback=%p)\n", uptr-ctx->dptr->units, ctx->io_top, ctx->callback);
if (ctx->io_top != TOP_DONE)
abort(); /* horribly wrong, stop */
if (ctx->callback && ctx->io_top == TOP_DONE) {
ctx->callback = NULL;
callback (uptr, ctx->io_status);
}
}
static t_bool _tape_is_active (UNIT *uptr)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
if (ctx) {
sim_debug (ctx->dbit, ctx->dptr, "_tape_is_active(unit=%d, top=%d)\n", uptr-ctx->dptr->units, ctx->io_top);
return (ctx->io_top != TOP_DONE);
}
return FALSE;
}
static void _tape_cancel (UNIT *uptr)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
if (ctx) {
sim_debug (ctx->dbit, ctx->dptr, "_tape_cancel(unit=%d, top=%d)\n", uptr-ctx->dptr->units, ctx->io_top);
if (ctx->asynch_io) {
pthread_mutex_lock (&ctx->io_lock);
while (ctx->io_top != TOP_DONE)
pthread_cond_wait (&ctx->io_done, &ctx->io_lock);
pthread_mutex_unlock (&ctx->io_lock);
}
}
}
#else
#define AIO_CALLSETUP
#define AIO_CALL(op, _buf, _fc, _bc, _max, _vbc, _gaplen, _bpi, _obj, _callback) \
if (_callback) \
(_callback) (uptr, r);
#endif
/* Enable asynchronous operation */
t_stat sim_tape_set_async (UNIT *uptr, int latency)
{
#if !defined(SIM_ASYNCH_IO)
char *msg = "Tape: can't operate asynchronously\r\n";
printf ("%s", msg);
if (sim_log) fprintf (sim_log, "%s", msg);
return SCPE_NOFNC;
#else
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
pthread_attr_t attr;
ctx->asynch_io = sim_asynch_enabled;
ctx->asynch_io_latency = latency;
if (ctx->asynch_io) {
pthread_mutex_init (&ctx->io_lock, NULL);
pthread_cond_init (&ctx->io_cond, NULL);
pthread_cond_init (&ctx->io_done, NULL);
pthread_cond_init (&ctx->startup_cond, NULL);
pthread_attr_init(&attr);
pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
pthread_mutex_lock (&ctx->io_lock);
pthread_create (&ctx->io_thread, &attr, _tape_io, (void *)uptr);
pthread_attr_destroy(&attr);
pthread_cond_wait (&ctx->startup_cond, &ctx->io_lock); /* Wait for thread to stabilize */
pthread_mutex_unlock (&ctx->io_lock);
pthread_cond_destroy (&ctx->startup_cond);
}
uptr->a_check_completion = _tape_completion_dispatch;
uptr->a_is_active = _tape_is_active;
uptr->a_cancel = _tape_cancel;
#endif
return SCPE_OK;
}
/* Disable asynchronous operation */
t_stat sim_tape_clr_async (UNIT *uptr)
{
#if !defined(SIM_ASYNCH_IO)
return SCPE_NOFNC;
#else
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
/* make sure device exists */
if (!ctx) return SCPE_UNATT;
if (ctx->asynch_io) {
pthread_mutex_lock (&ctx->io_lock);
ctx->asynch_io = 0;
pthread_cond_signal (&ctx->io_cond);
pthread_mutex_unlock (&ctx->io_lock);
pthread_join (ctx->io_thread, NULL);
pthread_mutex_destroy (&ctx->io_lock);
pthread_cond_destroy (&ctx->io_cond);
pthread_cond_destroy (&ctx->io_done);
}
return SCPE_OK;
#endif
}
/*
This routine is called when the simulator stops and any time
the asynch mode is changed (enabled or disabled)
*/
static void _sim_tape_io_flush (UNIT *uptr)
{
#if defined (SIM_ASYNCH_IO)
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
sim_tape_clr_async (uptr);
if (sim_asynch_enabled)
sim_tape_set_async (uptr, ctx->asynch_io_latency);
#endif
fflush (uptr->fileref);
}
/* Attach tape unit */
t_stat sim_tape_attach (UNIT *uptr, char *cptr)
{
return sim_tape_attach_ex (uptr, cptr, 0, 0);
}
t_stat sim_tape_attach_ex (UNIT *uptr, char *cptr, uint32 dbit, int completion_delay)
{
struct tape_context *ctx;
uint32 objc;
DEVICE *dptr;
char gbuf[CBUFSIZE];
t_stat r;
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 SCPE_ARG;
}
r = attach_unit (uptr, cptr); /* attach unit */
if (r != SCPE_OK) /* error? */
return r;
switch (MT_GET_FMT (uptr)) { /* case on format */
case MTUF_F_TPC: /* TPC */
objc = sim_tape_tpc_map (uptr, NULL); /* 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); /* 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 */
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)
{
uint32 f = MT_GET_FMT (uptr);
t_stat r;
if ((uptr == NULL) || !(uptr->flags & UNIT_ATT))
return SCPE_IERR;
if (uptr->io_flush)
uptr->io_flush (uptr); /* flush buffered data */
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;
return SCPE_OK;
}
t_stat sim_tape_attach_help(FILE *st, DEVICE *dptr, UNIT *uptr, int32 flag, char *cptr)
{
fprintf (st, "%s Tape Attach Help\n\n", dptr->name);
if (0 == (uptr-dptr->units)) {
if (dptr->numunits > 1) {
uint32 i;
for (i=0; i < dptr->numunits; ++i)
if (dptr->units[i].flags & UNIT_ATTABLE)
fprintf (st, " sim> ATTACH {switches} %s%d tapefile\n\n", dptr->name, i);
}
else
fprintf (st, " sim> ATTACH {switches} %s tapefile\n\n", dptr->name);
}
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;
}
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->dptr->dctrl & reason) {
sim_debug (reason, ctx->dptr, "%s%d %s len: %08X\n", ctx->dptr->name, uptr-ctx->dptr->units, txt, len);
if (detail) {
size_t i, same, group, sidx, oidx;
char outbuf[80], strbuf[18];
static char hex[] = "0123456789ABCDEF";
for (i=same=0; i<len; i += 16) {
if ((i > 0) && (0 == memcmp (&data[i], &data[i-16], 16))) {
++same;
continue;
}
if (same > 0) {
sim_debug (reason, ctx->dptr, "%04X thru %04X same as above\n", i-(16*same), i-1);
same = 0;
}
group = (((len - i) > 16) ? 16 : (len - i));
for (sidx=oidx=0; sidx<group; ++sidx) {
outbuf[oidx++] = ' ';
outbuf[oidx++] = hex[(data[i+sidx]>>4)&0xf];
outbuf[oidx++] = hex[data[i+sidx]&0xf];
if (isprint (data[i+sidx]))
strbuf[sidx] = data[i+sidx];
else
strbuf[sidx] = '.';
}
outbuf[oidx] = '\0';
strbuf[sidx] = '\0';
sim_debug (reason, ctx->dptr, "%04X%-48s %s\n", i, outbuf, strbuf);
}
if (same > 0) {
sim_debug (reason, ctx->dptr, "%04X thru %04X same as above\n", i-(16*same), len-1);
}
}
}
}
/* Read record length forward (internal routine)
Inputs:
uptr = pointer to tape unit
bc = pointer to returned record length
Outputs:
status = operation status
exit condition position
unit unattached unchanged
read error unchanged, PNU set
end of file/medium unchanged, PNU set
tape mark updated
data record updated, sim_fread will read record forward
See notes at "sim_tape_wrgap" regarding erase gap implementation.
*/
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;
MT_CLR_PNU (uptr);
if ((uptr->flags & UNIT_ATT) == 0) /* not attached? */
return MTSE_UNATT;
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* set tape pos */
switch (f) { /* switch on fmt */
case MTUF_F_STD: case MTUF_F_E11:
do {
sim_fread (bc, sizeof (t_mtrlnt), 1, uptr->fileref); /* read rec lnt */
sbc = MTR_L (*bc); /* save rec lnt */
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr); /* pos not upd */
return sim_tape_ioerr (uptr);
}
if (feof (uptr->fileref) || (*bc == MTR_EOM)) { /* eof or eom? */
MT_SET_PNU (uptr); /* pos not upd */
return MTSE_EOM;
}
uptr->pos = uptr->pos + sizeof (t_mtrlnt); /* spc over rec lnt */
if (*bc == MTR_TMK) /* tape mark? */
return MTSE_TMK;
if (*bc == MTR_FHGAP) { /* half gap? */
uptr->pos = uptr->pos + sizeof (t_mtrlnt) / 2; /* half space fwd */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* resync */
}
else if (*bc != MTR_GAP)
uptr->pos = uptr->pos + sizeof (t_mtrlnt) + /* spc over record */
((f == MTUF_F_STD)? ((sbc + 1) & ~1): sbc);
}
while ((*bc == MTR_GAP) || (*bc == MTR_FHGAP));
break;
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 */
return sim_tape_ioerr (uptr);
}
if (feof (uptr->fileref)) { /* eof? */
MT_SET_PNU (uptr); /* pos not upd */
return MTSE_EOM;
}
uptr->pos = uptr->pos + sizeof (t_tpclnt); /* spc over reclnt */
if (tpcbc == TPC_TMK) /* tape mark? */
return MTSE_TMK;
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 */
return sim_tape_ioerr (uptr);
}
if (feof (uptr->fileref)) { /* eof? */
if (sbc == 0) /* no data? eom */
return MTSE_EOM;
break; /* treat like eor */
}
if ((sbc != 0) && (c & P7B_SOR)) /* next record? */
break;
if ((c & P7B_DPAR) != P7B_EOF)
all_eof = 0;
}
*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? */
return MTSE_TMK;
break;
default:
return MTSE_FMT;
}
return MTSE_OK;
}
/* Read record length reverse (internal routine)
Inputs:
uptr = pointer to tape unit
bc = pointer to returned record length
Outputs:
status = operation status
exit condition position
unit unattached unchanged
beginning of tape unchanged
read error unchanged
end of file unchanged
end of medium updated
tape mark updated
data record updated, sim_fread will read record forward
See notes at "sim_tape_wrgap" regarding erase gap implementation.
*/
t_stat sim_tape_rdlntr (UNIT *uptr, t_mtrlnt *bc)
{
uint8 c;
t_bool all_eof;
uint32 f = MT_GET_FMT (uptr);
t_addr ppos;
t_mtrlnt sbc;
t_tpclnt tpcbc;
MT_CLR_PNU (uptr);
if ((uptr->flags & UNIT_ATT) == 0) /* not attached? */
return MTSE_UNATT;
if (sim_tape_bot (uptr)) /* at BOT? */
return MTSE_BOT;
switch (f) { /* switch on fmt */
case MTUF_F_STD: case MTUF_F_E11:
do {
sim_fseek (uptr->fileref, uptr->pos - sizeof (t_mtrlnt), SEEK_SET);
sim_fread (bc, sizeof (t_mtrlnt), 1, uptr->fileref); /* read rec lnt */
sbc = MTR_L (*bc);
if (ferror (uptr->fileref)) /* error? */
return sim_tape_ioerr (uptr);
if (feof (uptr->fileref)) /* eof? */
return MTSE_EOM;
uptr->pos = uptr->pos - sizeof (t_mtrlnt); /* spc over rec lnt */
if (*bc == MTR_EOM) /* eom? */
return MTSE_EOM;
if (*bc == MTR_TMK) /* tape mark? */
return MTSE_TMK;
if ((*bc & MTR_M_RHGAP) == MTR_RHGAP) { /* half gap? */
uptr->pos = uptr->pos + sizeof (t_mtrlnt) / 2; /* half space rev */
sim_fseek (uptr->fileref, uptr->pos, SEEK_SET); /* resync */
}
else if (*bc != MTR_GAP) {
uptr->pos = uptr->pos - sizeof (t_mtrlnt) - /* spc over record */
((f == MTUF_F_STD)? ((sbc + 1) & ~1): sbc);
sim_fseek (uptr->fileref, uptr->pos + sizeof (t_mtrlnt), SEEK_SET);
}
else if (sim_tape_bot (uptr)) /* backed into BOT? */
return MTSE_BOT;
}
while ((*bc == MTR_GAP) || (*bc == MTR_RHGAP));
break;
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? */
return sim_tape_ioerr (uptr);
if (feof (uptr->fileref)) /* eof? */
return MTSE_EOM;
uptr->pos = ppos; /* spc over record */
if (*bc == MTR_TMK) /* tape mark? */
return MTSE_TMK;
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? */
return sim_tape_ioerr (uptr);
if (feof (uptr->fileref)) /* eof? */
return MTSE_EOM;
if ((c & P7B_DPAR) != P7B_EOF)
all_eof = 0;
if (c & P7B_SOR) /* start of record? */
break;
}
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? */
return MTSE_TMK;
break;
default:
return MTSE_FMT;
}
return MTSE_OK;
}
/* Read record forward
Inputs:
uptr = pointer to tape unit
buf = pointer to buffer
bc = pointer to returned record length
max = maximum record size
Outputs:
status = operation status
exit condition position
unit unattached unchanged
read error unchanged, PNU set
end of file/medium unchanged, PNU set
invalid record unchanged, PNU set
tape mark updated
data record updated
data record error updated
*/
t_stat sim_tape_rdrecf (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
uint32 f = MT_GET_FMT (uptr);
t_mtrlnt i, tbc, rbc;
t_addr opos;
t_stat st;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_rdrecf(unit=%d, buf=%p, max=%d)\n", uptr-ctx->dptr->units, buf, max);
opos = uptr->pos; /* old position */
if (MTSE_OK != (st = sim_tape_rdlntf (uptr, &tbc))) /* read rec lnt */
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 */
if (ferror (uptr->fileref)) { /* error? */
MT_SET_PNU (uptr);
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;
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
r = sim_tape_rdrecf (uptr, buf, bc, max);
AIO_CALL(TOP_RDRF, buf, bc, NULL, max, 0, 0, 0, NULL, callback);
return r;
}
/* Read record reverse
Inputs:
uptr = pointer to tape unit
buf = pointer to buffer
bc = pointer to returned record length
max = maximum record size
Outputs:
status = operation status
exit condition position
unit unattached unchanged
read error unchanged
end of file unchanged
end of medium updated
invalid record unchanged
tape mark updated
data record updated
data record error updated
*/
t_stat sim_tape_rdrecr (UNIT *uptr, uint8 *buf, t_mtrlnt *bc, t_mtrlnt max)
{
struct tape_context *ctx = (struct tape_context *)uptr->tape_ctx;
uint32 f = MT_GET_FMT (uptr);
t_mtrlnt i, rbc, tbc;
t_stat st;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_rdrecr(unit=%d, buf=%p, max=%d)\n", uptr-ctx->dptr->units, buf, max);
if (MTSE_OK != (st = sim_tape_rdlntr (uptr, &tbc))) /* read rec lnt */
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;
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
r = sim_tape_rdrecr (uptr, buf, bc, max);
AIO_CALL(TOP_RDRR, buf, bc, NULL, max, 0, 0, 0, NULL, callback);
return r;
}
/* Write record forward
Inputs:
uptr = pointer to tape unit
buf = pointer to buffer
bc = record length
Outputs:
status = operation status
exit condition position
unit unattached unchanged
write protect unchanged
write error unchanged, PNU set
data record updated
*/
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;
sim_debug (ctx->dbit, ctx->dptr, "sim_tape_wrrecf(unit=%d, buf=%p, bc=%d)\n", uptr-ctx->dptr->units, buf, bc);
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 */
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;
}
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) */
t_stat sim_tape_wrdata (UNIT *uptr, uint32 dat)
{
MT_CLR_PNU (uptr);
if ((uptr->flags & UNIT_ATT) == 0) /* not attached? */
return MTSE_UNATT;