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Error in earlier patch in sv.c
[perl5.git] / perlio.c
CommitLineData
14a5cf38 1/*
cbdf9ef8 2 * perlio.c Copyright (c) 1996-2005, Nick Ing-Simmons You may distribute
14a5cf38 3 * under the terms of either the GNU General Public License or the
71200d45 4 * Artistic License, as specified in the README file.
760ac839
LW		 5 */
6
14a5cf38 7/*
d31a8517
AT		 8 * Hour after hour for nearly three weary days he had jogged up and down,
9 * over passes, and through long dales, and across many streams.
10 */
11
166f8a29
DM		 12/* This file contains the functions needed to implement PerlIO, which
13 * is Perl's private replacement for the C stdio library. This is used
14 * by default unless you compile with -Uuseperlio or run with
15 * PERLIO=:stdio (but don't do this unless you know what you're doing)
16 */
17
d31a8517 18/*
71200d45 19 * If we have ActivePerl-like PERL_IMPLICIT_SYS then we need a dTHX to get
14a5cf38 20 * at the dispatch tables, even when we do not need it for other reasons.
71200d45 21 * Invent a dSYS macro to abstract this out
14a5cf38 22 */
7bcba3d4
NIS		 23#ifdef PERL_IMPLICIT_SYS
24#define dSYS dTHX
25#else
26#define dSYS dNOOP
27#endif
28
760ac839 29#define VOIDUSED 1
12ae5dfc
JH		 30#ifdef PERL_MICRO
31# include "uconfig.h"
32#else
33# include "config.h"
34#endif
760ac839 35
6f9d8c32 36#define PERLIO_NOT_STDIO 0
760ac839 37#if !defined(PERLIO_IS_STDIO) && !defined(USE_SFIO)
14a5cf38 38/*
71200d45 39 * #define PerlIO FILE
14a5cf38 40 */
760ac839
LW		 41#endif
42/*
6f9d8c32 43 * This file provides those parts of PerlIO abstraction
88b61e10 44 * which are not #defined in perlio.h.
6f9d8c32 45 * Which these are depends on various Configure #ifdef's
760ac839
LW		 46 */
47
48#include "EXTERN.h"
864dbfa3 49#define PERL_IN_PERLIO_C
760ac839
LW		 50#include "perl.h"
51
32af7c23
CL		 52#ifdef PERL_IMPLICIT_CONTEXT
53#undef dSYS
54#define dSYS dTHX
55#endif
56
0c4f7ff0
NIS		 57#include "XSUB.h"
58
27da23d5
JH		 59#define PERLIO_MAX_REFCOUNTABLE_FD 2048
60
9cffb111
OS		 61#ifdef __Lynx__
62/* Missing proto on LynxOS */
63int mkstemp(char*);
64#endif
65
1b7a0411 66/* Call the callback or PerlIOBase, and return failure. */
b32dd47e 67#define Perl_PerlIO_or_Base(f, callback, base, failure, args) \
1b7a0411 68 if (PerlIOValid(f)) { \
de009b76 69 const PerlIO_funcs *tab = PerlIOBase(f)->tab; \
1b7a0411
JH		 70 if (tab && tab->callback) \
71 return (*tab->callback) args; \
72 else \
73 return PerlIOBase_ ## base args; \
74 } \
75 else \
76 SETERRNO(EBADF, SS_IVCHAN); \
77 return failure
78
79/* Call the callback or fail, and return failure. */
b32dd47e 80#define Perl_PerlIO_or_fail(f, callback, failure, args) \
1b7a0411 81 if (PerlIOValid(f)) { \
de009b76 82 const PerlIO_funcs *tab = PerlIOBase(f)->tab; \
1b7a0411
JH		 83 if (tab && tab->callback) \
84 return (*tab->callback) args; \
85 SETERRNO(EINVAL, LIB_INVARG); \
86 } \
87 else \
88 SETERRNO(EBADF, SS_IVCHAN); \
89 return failure
90
91/* Call the callback or PerlIOBase, and be void. */
b32dd47e 92#define Perl_PerlIO_or_Base_void(f, callback, base, args) \
1b7a0411 93 if (PerlIOValid(f)) { \
de009b76 94 const PerlIO_funcs *tab = PerlIOBase(f)->tab; \
1b7a0411
JH		 95 if (tab && tab->callback) \
96 (*tab->callback) args; \
97 else \
98 PerlIOBase_ ## base args; \
1b7a0411
JH		 99 } \
100 else \
101 SETERRNO(EBADF, SS_IVCHAN)
102
103/* Call the callback or fail, and be void. */
b32dd47e 104#define Perl_PerlIO_or_fail_void(f, callback, args) \
1b7a0411 105 if (PerlIOValid(f)) { \
de009b76 106 const PerlIO_funcs *tab = PerlIOBase(f)->tab; \
1b7a0411
JH		 107 if (tab && tab->callback) \
108 (*tab->callback) args; \
37725cdc
NIS		 109 else \
110 SETERRNO(EINVAL, LIB_INVARG); \
1b7a0411
JH		 111 } \
112 else \
113 SETERRNO(EBADF, SS_IVCHAN)
114
954fb84e
SH		 115#ifndef USE_SFIO
116int
f5b9d040 117perlsio_binmode(FILE *fp, int iotype, int mode)
60382766 118{
14a5cf38 119 /*
71200d45 120 * This used to be contents of do_binmode in doio.c
14a5cf38 121 */
60382766
NIS		 122#ifdef DOSISH
123# if defined(atarist) || defined(__MINT__)
f5b9d040 124 if (!fflush(fp)) {
60382766 125 if (mode & O_BINARY)
14a5cf38 126 ((FILE *) fp)->_flag |= _IOBIN;
60382766 127 else
14a5cf38 128 ((FILE *) fp)->_flag &= ~_IOBIN;
60382766
NIS		 129 return 1;
130 }
131 return 0;
132# else
eb73beca 133 dTHX;
14a5cf38
JH		 134#ifdef NETWARE
135 if (PerlLIO_setmode(fp, mode) != -1) {
136#else
f5b9d040 137 if (PerlLIO_setmode(fileno(fp), mode) != -1) {
14a5cf38 138#endif
60382766 139# if defined(WIN32) && defined(__BORLANDC__)
14a5cf38 140 /*
71200d45 141 * The translation mode of the stream is maintained independent of
14a5cf38 142 * the translation mode of the fd in the Borland RTL (heavy
71200d45 143 * digging through their runtime sources reveal). User has to set
14a5cf38 144 * the mode explicitly for the stream (though they don't document
71200d45 145 * this anywhere). GSAR 97-5-24
60382766 146 */
14a5cf38 147 fseek(fp, 0L, 0);
60382766 148 if (mode & O_BINARY)
f5b9d040 149 fp->flags |= _F_BIN;
60382766 150 else
14a5cf38 151 fp->flags &= ~_F_BIN;
60382766
NIS		 152# endif
153 return 1;
154 }
155 else
156 return 0;
157# endif
158#else
159# if defined(USEMYBINMODE)
04a0f00b 160 dTHX;
60382766
NIS		 161 if (my_binmode(fp, iotype, mode) != FALSE)
162 return 1;
163 else
164 return 0;
165# else
8772537c
AL		 166 PERL_UNUSED_ARG(fp);
167 PERL_UNUSED_ARG(iotype);
168 PERL_UNUSED_ARG(mode);
60382766
NIS		 169 return 1;
170# endif
171#endif
172}
de009b76 173#endif /* sfio */
60382766 174
06c7082d 175#ifndef O_ACCMODE
22569500 176#define O_ACCMODE 3 /* Assume traditional implementation */
06c7082d
NIS		 177#endif
178
179int
180PerlIO_intmode2str(int rawmode, char *mode, int *writing)
181{
de009b76 182 const int result = rawmode & O_ACCMODE;
06c7082d
NIS		 183 int ix = 0;
184 int ptype;
185 switch (result) {
186 case O_RDONLY:
187 ptype = IoTYPE_RDONLY;
188 break;
189 case O_WRONLY:
190 ptype = IoTYPE_WRONLY;
191 break;
192 case O_RDWR:
193 default:
194 ptype = IoTYPE_RDWR;
195 break;
196 }
197 if (writing)
198 *writing = (result != O_RDONLY);
199
200 if (result == O_RDONLY) {
201 mode[ix++] = 'r';
202 }
203#ifdef O_APPEND
204 else if (rawmode & O_APPEND) {
205 mode[ix++] = 'a';
206 if (result != O_WRONLY)
207 mode[ix++] = '+';
208 }
209#endif
210 else {
211 if (result == O_WRONLY)
212 mode[ix++] = 'w';
213 else {
214 mode[ix++] = 'r';
215 mode[ix++] = '+';
216 }
217 }
218 if (rawmode & O_BINARY)
219 mode[ix++] = 'b';
220 mode[ix] = '\0';
221 return ptype;
222}
223
eb73beca
NIS		 224#ifndef PERLIO_LAYERS
225int
226PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
227{
6874a2de
NIS		 228 if (!names || !*names
229 || strEQ(names, ":crlf")
230 || strEQ(names, ":raw")
231 || strEQ(names, ":bytes")
232 ) {
14a5cf38
JH		 233 return 0;
234 }
235 Perl_croak(aTHX_ "Cannot apply \"%s\" in non-PerlIO perl", names);
236 /*
71200d45 237 * NOTREACHED
14a5cf38
JH		 238 */
239 return -1;
eb73beca
NIS		 240}
241
13621cfb
NIS		 242void
243PerlIO_destruct(pTHX)
244{
245}
246
f5b9d040
NIS		 247int
248PerlIO_binmode(pTHX_ PerlIO *fp, int iotype, int mode, const char *names)
249{
92bff44d 250#ifdef USE_SFIO
8772537c
AL		 251 PERL_UNUSED_ARG(iotype);
252 PERL_UNUSED_ARG(mode);
253 PERL_UNUSED_ARG(names);
14a5cf38 254 return 1;
92bff44d 255#else
14a5cf38 256 return perlsio_binmode(fp, iotype, mode);
92bff44d 257#endif
f5b9d040 258}
60382766 259
e0fa5af2 260PerlIO *
ecdeb87c 261PerlIO_fdupopen(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
e0fa5af2 262{
27da23d5 263#if defined(PERL_MICRO) || defined(SYMBIAN)
0553478e
NIS		 264 return NULL;
265#else
266#ifdef PERL_IMPLICIT_SYS
22569500 267 return PerlSIO_fdupopen(f);
0553478e 268#else
30753f56
NIS		 269#ifdef WIN32
270 return win32_fdupopen(f);
271#else
e0fa5af2 272 if (f) {
504618e9 273 const int fd = PerlLIO_dup(PerlIO_fileno(f));
e0fa5af2 274 if (fd >= 0) {
06c7082d
NIS		 275 char mode[8];
276 int omode = fcntl(fd, F_GETFL);
a5936e02
JH		 277#ifdef DJGPP
278 omode = djgpp_get_stream_mode(f);
279#endif
06c7082d 280 PerlIO_intmode2str(omode,mode,NULL);
e0fa5af2 281 /* the r+ is a hack */
06c7082d 282 return PerlIO_fdopen(fd, mode);
e0fa5af2
NIS		 283 }
284 return NULL;
285 }
286 else {
93189314 287 SETERRNO(EBADF, SS_IVCHAN);
e0fa5af2 288 }
7114a2d2 289#endif
e0fa5af2 290 return NULL;
0553478e 291#endif
30753f56 292#endif
e0fa5af2
NIS		 293}
294
295
14a5cf38 296/*
71200d45 297 * De-mux PerlIO_openn() into fdopen, freopen and fopen type entries
14a5cf38 298 */
ee518936
NIS		 299
300PerlIO *
14a5cf38
JH		 301PerlIO_openn(pTHX_ const char *layers, const char *mode, int fd,
302 int imode, int perm, PerlIO *old, int narg, SV **args)
303{
7cf31beb
NIS		 304 if (narg) {
305 if (narg > 1) {
3b8752bb 306 Perl_croak(aTHX_ "More than one argument to open");
7cf31beb 307 }
14a5cf38
JH		 308 if (*args == &PL_sv_undef)
309 return PerlIO_tmpfile();
310 else {
e62f0680 311 const char *name = SvPV_nolen_const(*args);
3b6c1aba 312 if (*mode == IoTYPE_NUMERIC) {
14a5cf38
JH		 313 fd = PerlLIO_open3(name, imode, perm);
314 if (fd >= 0)
de009b76 315 return PerlIO_fdopen(fd, mode + 1);
14a5cf38
JH		 316 }
317 else if (old) {
318 return PerlIO_reopen(name, mode, old);
319 }
320 else {
321 return PerlIO_open(name, mode);
322 }
323 }
324 }
325 else {
326 return PerlIO_fdopen(fd, (char *) mode);
327 }
328 return NULL;
ee518936
NIS		 329}
330
0c4f7ff0
NIS		 331XS(XS_PerlIO__Layer__find)
332{
14a5cf38
JH		 333 dXSARGS;
334 if (items < 2)
335 Perl_croak(aTHX_ "Usage class->find(name[,load])");
336 else {
e62f0680 337 const char *name = SvPV_nolen_const(ST(1));
14a5cf38
JH		 338 ST(0) = (strEQ(name, "crlf")
339 || strEQ(name, "raw")) ? &PL_sv_yes : &PL_sv_undef;
340 XSRETURN(1);
341 }
0c4f7ff0
NIS		 342}
343
344
345void
346Perl_boot_core_PerlIO(pTHX)
347{
14a5cf38 348 newXS("PerlIO::Layer::find", XS_PerlIO__Layer__find, __FILE__);
0c4f7ff0
NIS		 349}
350
ac27b0f5
NIS		 351#endif
352
32e30700 353
6f9d8c32 354#ifdef PERLIO_IS_STDIO
760ac839
LW		 355
356void
e8632036 357PerlIO_init(pTHX)
760ac839 358{
14a5cf38
JH		 359 /*
360 * Does nothing (yet) except force this file to be included in perl
71200d45 361 * binary. That allows this file to force inclusion of other functions
14a5cf38 362 * that may be required by loadable extensions e.g. for
71200d45 363 * FileHandle::tmpfile
14a5cf38 364 */
760ac839
LW		 365}
366
33dcbb9a 367#undef PerlIO_tmpfile
368PerlIO *
8ac85365 369PerlIO_tmpfile(void)
33dcbb9a 370{
14a5cf38 371 return tmpfile();
33dcbb9a 372}
373
22569500 374#else /* PERLIO_IS_STDIO */
760ac839
LW		 375
376#ifdef USE_SFIO
377
378#undef HAS_FSETPOS
379#undef HAS_FGETPOS
380
14a5cf38
JH		 381/*
382 * This section is just to make sure these functions get pulled in from
71200d45 383 * libsfio.a
14a5cf38 384 */
760ac839
LW		 385
386#undef PerlIO_tmpfile
387PerlIO *
c78749f2 388PerlIO_tmpfile(void)
760ac839 389{
14a5cf38 390 return sftmp(0);
760ac839
LW		 391}
392
393void
e8632036 394PerlIO_init(pTHX)
760ac839 395{
14a5cf38
JH		 396 /*
397 * Force this file to be included in perl binary. Which allows this
398 * file to force inclusion of other functions that may be required by
71200d45 399 * loadable extensions e.g. for FileHandle::tmpfile
14a5cf38 400 */
760ac839 401
14a5cf38 402 /*
71200d45 403 * Hack sfio does its own 'autoflush' on stdout in common cases. Flush
14a5cf38 404 * results in a lot of lseek()s to regular files and lot of small
71200d45 405 * writes to pipes.
14a5cf38
JH		 406 */
407 sfset(sfstdout, SF_SHARE, 0);
760ac839
LW		 408}
409
b9d6bf13 410/* This is not the reverse of PerlIO_exportFILE(), PerlIO_releaseFILE() is. */
92bff44d 411PerlIO *
4b069b44 412PerlIO_importFILE(FILE *stdio, const char *mode)
92bff44d 413{
de009b76 414 const int fd = fileno(stdio);
4b069b44 415 if (!mode || !*mode) {
81428673 416 mode = "r+";
4b069b44
NIS		 417 }
418 return PerlIO_fdopen(fd, mode);
92bff44d
NIS		 419}
420
421FILE *
422PerlIO_findFILE(PerlIO *pio)
423{
de009b76
AL		 424 const int fd = PerlIO_fileno(pio);
425 FILE * const f = fdopen(fd, "r+");
14a5cf38
JH		 426 PerlIO_flush(pio);
427 if (!f && errno == EINVAL)
428 f = fdopen(fd, "w");
429 if (!f && errno == EINVAL)
430 f = fdopen(fd, "r");
431 return f;
92bff44d
NIS		 432}
433
434
22569500 435#else /* USE_SFIO */
6f9d8c32 436/*======================================================================================*/
14a5cf38 437/*
71200d45 438 * Implement all the PerlIO interface ourselves.
9e353e3b 439 */
760ac839 440
76ced9ad
NIS		 441#include "perliol.h"
442
14a5cf38
JH		 443/*
444 * We _MUST_ have <unistd.h> if we are using lseek() and may have large
71200d45 445 * files
14a5cf38 446 */
02f66e2f
NIS		 447#ifdef I_UNISTD
448#include <unistd.h>
449#endif
06da4f11
NIS		 450#ifdef HAS_MMAP
451#include <sys/mman.h>
452#endif
453
6f9d8c32 454void
14a5cf38
JH		 455PerlIO_debug(const char *fmt, ...)
456{
14a5cf38
JH		 457 va_list ap;
458 dSYS;
459 va_start(ap, fmt);
27da23d5 460 if (!PL_perlio_debug_fd && !PL_tainting && PL_uid == PL_euid && PL_gid == PL_egid) {
de009b76 461 const char *s = PerlEnv_getenv("PERLIO_DEBUG");
14a5cf38 462 if (s && *s)
27da23d5 463 PL_perlio_debug_fd = PerlLIO_open3(s, O_WRONLY | O_CREAT | O_APPEND, 0666);
14a5cf38 464 else
27da23d5 465 PL_perlio_debug_fd = -1;
14a5cf38 466 }
27da23d5 467 if (PL_perlio_debug_fd > 0) {
14a5cf38 468 dTHX;
de009b76
AL		 469 const char *s = CopFILE(PL_curcop);
470 STRLEN len;
70ace5da
NIS		 471#ifdef USE_ITHREADS
472 /* Use fixed buffer as sv_catpvf etc. needs SVs */
473 char buffer[1024];
70ace5da
NIS		 474 if (!s)
475 s = "(none)";
de009b76 476 len = sprintf(buffer, "%.40s:%" IVdf " ", s, (IV) CopLINE(PL_curcop));
70ace5da 477 vsprintf(buffer+len, fmt, ap);
27da23d5 478 PerlLIO_write(PL_perlio_debug_fd, buffer, strlen(buffer));
70ace5da 479#else
14a5cf38 480 SV *sv = newSVpvn("", 0);
14a5cf38
JH		 481 if (!s)
482 s = "(none)";
483 Perl_sv_catpvf(aTHX_ sv, "%s:%" IVdf " ", s,
484 (IV) CopLINE(PL_curcop));
485 Perl_sv_vcatpvf(aTHX_ sv, fmt, &ap);
486
b83604b4 487 s = SvPV_const(sv, len);
27da23d5 488 PerlLIO_write(PL_perlio_debug_fd, s, len);
14a5cf38 489 SvREFCNT_dec(sv);
70ace5da 490#endif
14a5cf38
JH		 491 }
492 va_end(ap);
6f9d8c32
NIS		 493}
494
9e353e3b
NIS		 495/*--------------------------------------------------------------------------------------*/
496
14a5cf38 497/*
71200d45 498 * Inner level routines
14a5cf38 499 */
9e353e3b 500
14a5cf38 501/*
71200d45 502 * Table of pointers to the PerlIO structs (malloc'ed)
14a5cf38 503 */
05d1247b 504#define PERLIO_TABLE_SIZE 64
6f9d8c32 505
760ac839 506PerlIO *
5f1a76d0 507PerlIO_allocate(pTHX)
6f9d8c32 508{
14a5cf38 509 /*
71200d45 510 * Find a free slot in the table, allocating new table as necessary
14a5cf38
JH		 511 */
512 PerlIO **last;
513 PerlIO *f;
a1ea730d 514 last = &PL_perlio;
14a5cf38
JH		 515 while ((f = *last)) {
516 int i;
517 last = (PerlIO **) (f);
518 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
519 if (!*++f) {
520 return f;
521 }
522 }
523 }
a02a5408 524 Newxz(f,PERLIO_TABLE_SIZE,PerlIO);
14a5cf38
JH		 525 if (!f) {
526 return NULL;
527 }
528 *last = f;
529 return f + 1;
05d1247b
NIS		 530}
531
a1ea730d
NIS		 532#undef PerlIO_fdupopen
533PerlIO *
ecdeb87c 534PerlIO_fdupopen(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
a1ea730d 535{
04892f78 536 if (PerlIOValid(f)) {
de009b76 537 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
fe5a182c 538 PerlIO_debug("fdupopen f=%p param=%p\n",(void*)f,(void*)param);
210e727c
JH		 539 if (tab && tab->Dup)
540 return (*tab->Dup)(aTHX_ PerlIO_allocate(aTHX), f, param, flags);
37725cdc
NIS		 541 else {
542 return PerlIOBase_dup(aTHX_ PerlIO_allocate(aTHX), f, param, flags);
543 }
a1ea730d 544 }
210e727c
JH		 545 else
546 SETERRNO(EBADF, SS_IVCHAN);
547
548 return NULL;
a1ea730d
NIS		 549}
550
551void
5f1a76d0 552PerlIO_cleantable(pTHX_ PerlIO **tablep)
05d1247b 553{
14a5cf38
JH		 554 PerlIO *table = *tablep;
555 if (table) {
556 int i;
557 PerlIO_cleantable(aTHX_(PerlIO **) & (table[0]));
558 for (i = PERLIO_TABLE_SIZE - 1; i > 0; i--) {
559 PerlIO *f = table + i;
560 if (*f) {
561 PerlIO_close(f);
562 }
563 }
3a1ee7e8 564 Safefree(table);
14a5cf38 565 *tablep = NULL;
05d1247b 566 }
05d1247b
NIS		 567}
568
fcf2db38
NIS		 569
570PerlIO_list_t *
3a1ee7e8 571PerlIO_list_alloc(pTHX)
fcf2db38 572{
14a5cf38 573 PerlIO_list_t *list;
a02a5408 574 Newxz(list, 1, PerlIO_list_t);
14a5cf38
JH		 575 list->refcnt = 1;
576 return list;
fcf2db38
NIS		 577}
578
579void
3a1ee7e8 580PerlIO_list_free(pTHX_ PerlIO_list_t *list)
fcf2db38 581{
14a5cf38
JH		 582 if (list) {
583 if (--list->refcnt == 0) {
584 if (list->array) {
14a5cf38
JH		 585 IV i;
586 for (i = 0; i < list->cur; i++) {
587 if (list->array[i].arg)
588 SvREFCNT_dec(list->array[i].arg);
589 }
590 Safefree(list->array);
591 }
592 Safefree(list);
593 }
594 }
fcf2db38
NIS		 595}
596
597void
3a1ee7e8 598PerlIO_list_push(pTHX_ PerlIO_list_t *list, PerlIO_funcs *funcs, SV *arg)
14a5cf38 599{
14a5cf38
JH		 600 PerlIO_pair_t *p;
601 if (list->cur >= list->len) {
602 list->len += 8;
603 if (list->array)
604 Renew(list->array, list->len, PerlIO_pair_t);
605 else
a02a5408 606 Newx(list->array, list->len, PerlIO_pair_t);
14a5cf38
JH		 607 }
608 p = &(list->array[list->cur++]);
609 p->funcs = funcs;
610 if ((p->arg = arg)) {
7fc63493 611 (void)SvREFCNT_inc(arg);
14a5cf38 612 }
fcf2db38
NIS		 613}
614
3a1ee7e8
NIS		 615PerlIO_list_t *
616PerlIO_clone_list(pTHX_ PerlIO_list_t *proto, CLONE_PARAMS *param)
617{
694c95cf
JH		 618 PerlIO_list_t *list = (PerlIO_list_t *) NULL;
619 if (proto) {
620 int i;
621 list = PerlIO_list_alloc(aTHX);
622 for (i=0; i < proto->cur; i++) {
623 SV *arg = Nullsv;
624 if (proto->array[i].arg)
625 arg = PerlIO_sv_dup(aTHX_ proto->array[i].arg,param);
626 PerlIO_list_push(aTHX_ list, proto->array[i].funcs, arg);
627 }
3a1ee7e8
NIS		 628 }
629 return list;
630}
4a4a6116 631
05d1247b 632void
3a1ee7e8 633PerlIO_clone(pTHX_ PerlInterpreter *proto, CLONE_PARAMS *param)
9a6404c5 634{
3aaf42a7 635#ifdef USE_ITHREADS
3a1ee7e8
NIS		 636 PerlIO **table = &proto->Iperlio;
637 PerlIO *f;
638 PL_perlio = NULL;
639 PL_known_layers = PerlIO_clone_list(aTHX_ proto->Iknown_layers, param);
640 PL_def_layerlist = PerlIO_clone_list(aTHX_ proto->Idef_layerlist, param);
641 PerlIO_allocate(aTHX); /* root slot is never used */
694c95cf 642 PerlIO_debug("Clone %p from %p\n",aTHX,proto);
3a1ee7e8
NIS		 643 while ((f = *table)) {
644 int i;
645 table = (PerlIO **) (f++);
646 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
647 if (*f) {
93a8090d 648 (void) fp_dup(f, 0, param);
3a1ee7e8
NIS		 649 }
650 f++;
651 }
652 }
1b6737cc
AL		 653#else
654 PERL_UNUSED_ARG(proto);
655 PERL_UNUSED_ARG(param);
3aaf42a7 656#endif
9a6404c5
DM		 657}
658
659void
13621cfb
NIS		 660PerlIO_destruct(pTHX)
661{
a1ea730d 662 PerlIO **table = &PL_perlio;
14a5cf38 663 PerlIO *f;
694c95cf
JH		 664#ifdef USE_ITHREADS
665 PerlIO_debug("Destruct %p\n",aTHX);
666#endif
14a5cf38
JH		 667 while ((f = *table)) {
668 int i;
669 table = (PerlIO **) (f++);
670 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
671 PerlIO *x = f;
672 PerlIOl *l;
673 while ((l = *x)) {
674 if (l->tab->kind & PERLIO_K_DESTRUCT) {
675 PerlIO_debug("Destruct popping %s\n", l->tab->name);
676 PerlIO_flush(x);
677 PerlIO_pop(aTHX_ x);
678 }
679 else {
680 x = PerlIONext(x);
681 }
682 }
683 f++;
684 }
685 }
13621cfb
NIS		 686}
687
688void
a999f61b 689PerlIO_pop(pTHX_ PerlIO *f)
760ac839 690{
14a5cf38
JH		 691 PerlIOl *l = *f;
692 if (l) {
fe5a182c 693 PerlIO_debug("PerlIO_pop f=%p %s\n", (void*)f, l->tab->name);
14a5cf38
JH		 694 if (l->tab->Popped) {
695 /*
696 * If popped returns non-zero do not free its layer structure
697 * it has either done so itself, or it is shared and still in
71200d45 698 * use
14a5cf38 699 */
f62ce20a 700 if ((*l->tab->Popped) (aTHX_ f) != 0)
14a5cf38
JH		 701 return;
702 }
b47cad08 703 *f = l->next;
3a1ee7e8 704 Safefree(l);
a8c08ecd 705 }
6f9d8c32
NIS		 706}
707
39f7a870
JH		 708/* Return as an array the stack of layers on a filehandle. Note that
709 * the stack is returned top-first in the array, and there are three
710 * times as many array elements as there are layers in the stack: the
711 * first element of a layer triplet is the name, the second one is the
712 * arguments, and the third one is the flags. */
713
714AV *
715PerlIO_get_layers(pTHX_ PerlIO *f)
716{
717 AV *av = newAV();
718
719 if (PerlIOValid(f)) {
39f7a870
JH		 720 PerlIOl *l = PerlIOBase(f);
721
722 while (l) {
723 SV *name = l->tab && l->tab->name ?
724 newSVpv(l->tab->name, 0) : &PL_sv_undef;
725 SV *arg = l->tab && l->tab->Getarg ?
726 (*l->tab->Getarg)(aTHX_ &l, 0, 0) : &PL_sv_undef;
727 av_push(av, name);
728 av_push(av, arg);
729 av_push(av, newSViv((IV)l->flags));
730 l = l->next;
731 }
732 }
733
734 return av;
735}
736
9e353e3b 737/*--------------------------------------------------------------------------------------*/
14a5cf38 738/*
71200d45 739 * XS Interface for perl code
14a5cf38 740 */
9e353e3b 741
fcf2db38 742PerlIO_funcs *
2edd7e44 743PerlIO_find_layer(pTHX_ const char *name, STRLEN len, int load)
f3862f8b 744{
27da23d5 745 dVAR;
14a5cf38
JH		 746 IV i;
747 if ((SSize_t) len <= 0)
748 len = strlen(name);
3a1ee7e8
NIS		 749 for (i = 0; i < PL_known_layers->cur; i++) {
750 PerlIO_funcs *f = PL_known_layers->array[i].funcs;
a9f76400 751 if (memEQ(f->name, name, len) && f->name[len] == 0) {
fe5a182c 752 PerlIO_debug("%.*s => %p\n", (int) len, name, (void*)f);
14a5cf38
JH		 753 return f;
754 }
755 }
3a1ee7e8
NIS		 756 if (load && PL_subname && PL_def_layerlist
757 && PL_def_layerlist->cur >= 2) {
d7a09b41
SR		 758 if (PL_in_load_module) {
759 Perl_croak(aTHX_ "Recursive call to Perl_load_module in PerlIO_find_layer");
760 return NULL;
761 } else {
762 SV *pkgsv = newSVpvn("PerlIO", 6);
763 SV *layer = newSVpvn(name, len);
c9bca74a
NIS		 764 CV *cv = get_cv("PerlIO::Layer::NoWarnings", FALSE);
765 ENTER;
d7a09b41 766 SAVEINT(PL_in_load_module);
c9bca74a 767 if (cv) {
9cfa90c0 768 SAVEGENERICSV(PL_warnhook);
504618e9 769 (void)SvREFCNT_inc(cv);
c9bca74a
NIS		 770 PL_warnhook = (SV *) cv;
771 }
d7a09b41
SR		 772 PL_in_load_module++;
773 /*
774 * The two SVs are magically freed by load_module
775 */
776 Perl_load_module(aTHX_ 0, pkgsv, Nullsv, layer, Nullsv);
777 PL_in_load_module--;
778 LEAVE;
779 return PerlIO_find_layer(aTHX_ name, len, 0);
780 }
14a5cf38
JH		 781 }
782 PerlIO_debug("Cannot find %.*s\n", (int) len, name);
783 return NULL;
f3862f8b
NIS		 784}
785
2a1bc955 786#ifdef USE_ATTRIBUTES_FOR_PERLIO
b13b2135
NIS		 787
788static int
789perlio_mg_set(pTHX_ SV *sv, MAGIC *mg)
790{
14a5cf38
JH		 791 if (SvROK(sv)) {
792 IO *io = GvIOn((GV *) SvRV(sv));
793 PerlIO *ifp = IoIFP(io);
794 PerlIO *ofp = IoOFP(io);
795 Perl_warn(aTHX_ "set %" SVf " %p %p %p", sv, io, ifp, ofp);
796 }
797 return 0;
b13b2135
NIS		 798}
799
800static int
801perlio_mg_get(pTHX_ SV *sv, MAGIC *mg)
802{
14a5cf38
JH		 803 if (SvROK(sv)) {
804 IO *io = GvIOn((GV *) SvRV(sv));
805 PerlIO *ifp = IoIFP(io);
806 PerlIO *ofp = IoOFP(io);
807 Perl_warn(aTHX_ "get %" SVf " %p %p %p", sv, io, ifp, ofp);
808 }
809 return 0;
b13b2135
NIS		 810}
811
812static int
813perlio_mg_clear(pTHX_ SV *sv, MAGIC *mg)
814{
14a5cf38
JH		 815 Perl_warn(aTHX_ "clear %" SVf, sv);
816 return 0;
b13b2135
NIS		 817}
818
819static int
820perlio_mg_free(pTHX_ SV *sv, MAGIC *mg)
821{
14a5cf38
JH		 822 Perl_warn(aTHX_ "free %" SVf, sv);
823 return 0;
b13b2135
NIS		 824}
825
826MGVTBL perlio_vtab = {
14a5cf38
JH		 827 perlio_mg_get,
828 perlio_mg_set,
22569500 829 NULL, /* len */
14a5cf38
JH		 830 perlio_mg_clear,
831 perlio_mg_free
b13b2135
NIS		 832};
833
834XS(XS_io_MODIFY_SCALAR_ATTRIBUTES)
835{
14a5cf38
JH		 836 dXSARGS;
837 SV *sv = SvRV(ST(1));
838 AV *av = newAV();
839 MAGIC *mg;
840 int count = 0;
841 int i;
842 sv_magic(sv, (SV *) av, PERL_MAGIC_ext, NULL, 0);
843 SvRMAGICAL_off(sv);
844 mg = mg_find(sv, PERL_MAGIC_ext);
845 mg->mg_virtual = &perlio_vtab;
846 mg_magical(sv);
847 Perl_warn(aTHX_ "attrib %" SVf, sv);
848 for (i = 2; i < items; i++) {
849 STRLEN len;
e62f0680 850 const char *name = SvPV_const(ST(i), len);
14a5cf38
JH		 851 SV *layer = PerlIO_find_layer(aTHX_ name, len, 1);
852 if (layer) {
853 av_push(av, SvREFCNT_inc(layer));
854 }
855 else {
856 ST(count) = ST(i);
857 count++;
858 }
859 }
860 SvREFCNT_dec(av);
861 XSRETURN(count);
862}
863
22569500 864#endif /* USE_ATTIBUTES_FOR_PERLIO */
2a1bc955 865
e3f3bf95
NIS		 866SV *
867PerlIO_tab_sv(pTHX_ PerlIO_funcs *tab)
f3862f8b 868{
14a5cf38
JH		 869 HV *stash = gv_stashpv("PerlIO::Layer", TRUE);
870 SV *sv = sv_bless(newRV_noinc(newSViv(PTR2IV(tab))), stash);
871 return sv;
e3f3bf95
NIS		 872}
873
5ca1d77f 874XS(XS_PerlIO__Layer__NoWarnings)
c9bca74a 875{
37725cdc 876 /* This is used as a %SIG{__WARN__} handler to supress warnings
c9bca74a
NIS		 877 during loading of layers.
878 */
879 dXSARGS;
880 if (items)
e62f0680 881 PerlIO_debug("warning:%s\n",SvPV_nolen_const(ST(0)));
c9bca74a
NIS		 882 XSRETURN(0);
883}
884
5ca1d77f 885XS(XS_PerlIO__Layer__find)
0c4f7ff0 886{
14a5cf38
JH		 887 dXSARGS;
888 if (items < 2)
889 Perl_croak(aTHX_ "Usage class->find(name[,load])");
890 else {
de009b76 891 STRLEN len;
e62f0680 892 const char *name = SvPV_const(ST(1), len);
de009b76 893 const bool load = (items > 2) ? SvTRUE(ST(2)) : 0;
14a5cf38
JH		 894 PerlIO_funcs *layer = PerlIO_find_layer(aTHX_ name, len, load);
895 ST(0) =
896 (layer) ? sv_2mortal(PerlIO_tab_sv(aTHX_ layer)) :
897 &PL_sv_undef;
898 XSRETURN(1);
899 }
0c4f7ff0
NIS		 900}
901
e3f3bf95
NIS		 902void
903PerlIO_define_layer(pTHX_ PerlIO_funcs *tab)
904{
3a1ee7e8
NIS		 905 if (!PL_known_layers)
906 PL_known_layers = PerlIO_list_alloc(aTHX);
907 PerlIO_list_push(aTHX_ PL_known_layers, tab, Nullsv);
fe5a182c 908 PerlIO_debug("define %s %p\n", tab->name, (void*)tab);
f3862f8b
NIS		 909}
910
1141d9f8 911int
fcf2db38 912PerlIO_parse_layers(pTHX_ PerlIO_list_t *av, const char *names)
1141d9f8 913{
14a5cf38
JH		 914 if (names) {
915 const char *s = names;
916 while (*s) {
917 while (isSPACE(*s) || *s == ':')
918 s++;
919 if (*s) {
920 STRLEN llen = 0;
921 const char *e = s;
922 const char *as = Nullch;
923 STRLEN alen = 0;
924 if (!isIDFIRST(*s)) {
925 /*
926 * Message is consistent with how attribute lists are
927 * passed. Even though this means "foo : : bar" is
71200d45 928 * seen as an invalid separator character.
14a5cf38 929 */
de009b76 930 const char q = ((*s == '\'') ? '"' : '\'');
99ef548b 931 if (ckWARN(WARN_LAYER))
22569500 932 Perl_warner(aTHX_ packWARN(WARN_LAYER),
b4581f09 933 "Invalid separator character %c%c%c in PerlIO layer specification %s",
1e616cf5 934 q, *s, q, s);
93189314 935 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH		 936 return -1;
937 }
938 do {
939 e++;
940 } while (isALNUM(*e));
941 llen = e - s;
942 if (*e == '(') {
943 int nesting = 1;
944 as = ++e;
945 while (nesting) {
946 switch (*e++) {
947 case ')':
948 if (--nesting == 0)
949 alen = (e - 1) - as;
950 break;
951 case '(':
952 ++nesting;
953 break;
954 case '\\':
955 /*
956 * It's a nul terminated string, not allowed
957 * to \ the terminating null. Anything other
71200d45 958 * character is passed over.
14a5cf38
JH		 959 */
960 if (*e++) {
961 break;
962 }
963 /*
71200d45 964 * Drop through
14a5cf38
JH		 965 */
966 case '\0':
967 e--;
22569500
NIS		 968 if (ckWARN(WARN_LAYER))
969 Perl_warner(aTHX_ packWARN(WARN_LAYER),
b4581f09 970 "Argument list not closed for PerlIO layer \"%.*s\"",
14a5cf38
JH		 971 (int) (e - s), s);
972 return -1;
973 default:
974 /*
71200d45 975 * boring.
14a5cf38
JH		 976 */
977 break;
978 }
979 }
980 }
981 if (e > s) {
982 PerlIO_funcs *layer =
983 PerlIO_find_layer(aTHX_ s, llen, 1);
984 if (layer) {
3a1ee7e8 985 PerlIO_list_push(aTHX_ av, layer,
14a5cf38
JH		 986 (as) ? newSVpvn(as,
987 alen) :
988 &PL_sv_undef);
989 }
990 else {
041457d9 991 if (ckWARN(WARN_LAYER))
b4581f09 992 Perl_warner(aTHX_ packWARN(WARN_LAYER), "Unknown PerlIO layer \"%.*s\"",
14a5cf38
JH		 993 (int) llen, s);
994 return -1;
995 }
996 }
997 s = e;
998 }
999 }
1000 }
1001 return 0;
1141d9f8
NIS		 1002}
1003
dfebf958 1004void
fcf2db38 1005PerlIO_default_buffer(pTHX_ PerlIO_list_t *av)
dfebf958 1006{
27da23d5 1007 PERLIO_FUNCS_DECL(*tab) = &PerlIO_perlio;
35990314 1008#ifdef PERLIO_USING_CRLF
6ce75a77 1009 tab = &PerlIO_crlf;
846be114 1010#else
6ce75a77 1011 if (PerlIO_stdio.Set_ptrcnt)
22569500 1012 tab = &PerlIO_stdio;
846be114 1013#endif
14a5cf38 1014 PerlIO_debug("Pushing %s\n", tab->name);
3a1ee7e8 1015 PerlIO_list_push(aTHX_ av, PerlIO_find_layer(aTHX_ tab->name, 0, 0),
14a5cf38 1016 &PL_sv_undef);
dfebf958
NIS		 1017}
1018
e3f3bf95 1019SV *
14a5cf38 1020PerlIO_arg_fetch(PerlIO_list_t *av, IV n)
e3f3bf95 1021{
14a5cf38 1022 return av->array[n].arg;
e3f3bf95
NIS		 1023}
1024
f3862f8b 1025PerlIO_funcs *
14a5cf38 1026PerlIO_layer_fetch(pTHX_ PerlIO_list_t *av, IV n, PerlIO_funcs *def)
f3862f8b 1027{
14a5cf38
JH		 1028 if (n >= 0 && n < av->cur) {
1029 PerlIO_debug("Layer %" IVdf " is %s\n", n,
1030 av->array[n].funcs->name);
1031 return av->array[n].funcs;
1032 }
1033 if (!def)
1034 Perl_croak(aTHX_ "panic: PerlIO layer array corrupt");
1035 return def;
e3f3bf95
NIS		 1036}
1037
4ec2216f
NIS		 1038IV
1039PerlIOPop_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
1040{
8772537c
AL		 1041 PERL_UNUSED_ARG(mode);
1042 PERL_UNUSED_ARG(arg);
1043 PERL_UNUSED_ARG(tab);
4ec2216f
NIS		 1044 if (PerlIOValid(f)) {
1045 PerlIO_flush(f);
1046 PerlIO_pop(aTHX_ f);
1047 return 0;
1048 }
1049 return -1;
1050}
1051
27da23d5 1052PERLIO_FUNCS_DECL(PerlIO_remove) = {
4ec2216f
NIS		 1053 sizeof(PerlIO_funcs),
1054 "pop",
1055 0,
1056 PERLIO_K_DUMMY | PERLIO_K_UTF8,
1057 PerlIOPop_pushed,
1058 NULL,
1059 NULL,
1060 NULL,
1061 NULL,
1062 NULL,
1063 NULL,
1064 NULL,
1065 NULL,
1066 NULL,
1067 NULL,
de009b76
AL		 1068 NULL,
1069 NULL,
4ec2216f
NIS		 1070 NULL, /* flush */
1071 NULL, /* fill */
1072 NULL,
1073 NULL,
1074 NULL,
1075 NULL,
1076 NULL, /* get_base */
1077 NULL, /* get_bufsiz */
1078 NULL, /* get_ptr */
1079 NULL, /* get_cnt */
1080 NULL, /* set_ptrcnt */
1081};
1082
fcf2db38 1083PerlIO_list_t *
e3f3bf95
NIS		 1084PerlIO_default_layers(pTHX)
1085{
3a1ee7e8 1086 if (!PL_def_layerlist) {
14a5cf38 1087 const char *s = (PL_tainting) ? Nullch : PerlEnv_getenv("PERLIO");
27da23d5 1088 PERLIO_FUNCS_DECL(*osLayer) = &PerlIO_unix;
3a1ee7e8 1089 PL_def_layerlist = PerlIO_list_alloc(aTHX);
27da23d5 1090 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_unix));
979e2c82 1091#if defined(WIN32)
27da23d5 1092 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_win32));
2f8118af 1093#if 0
14a5cf38 1094 osLayer = &PerlIO_win32;
0c4128ad 1095#endif
2f8118af 1096#endif
27da23d5
JH		 1097 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_raw));
1098 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_perlio));
1099 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_stdio));
1100 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_crlf));
06da4f11 1101#ifdef HAS_MMAP
27da23d5 1102 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_mmap));
06da4f11 1103#endif
27da23d5
JH		 1104 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_utf8));
1105 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_remove));
1106 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_byte));
3a1ee7e8 1107 PerlIO_list_push(aTHX_ PL_def_layerlist,
14a5cf38
JH		 1108 PerlIO_find_layer(aTHX_ osLayer->name, 0, 0),
1109 &PL_sv_undef);
1110 if (s) {
3a1ee7e8 1111 PerlIO_parse_layers(aTHX_ PL_def_layerlist, s);
14a5cf38
JH		 1112 }
1113 else {
3a1ee7e8 1114 PerlIO_default_buffer(aTHX_ PL_def_layerlist);
14a5cf38 1115 }
1141d9f8 1116 }
3a1ee7e8
NIS		 1117 if (PL_def_layerlist->cur < 2) {
1118 PerlIO_default_buffer(aTHX_ PL_def_layerlist);
f3862f8b 1119 }
3a1ee7e8 1120 return PL_def_layerlist;
e3f3bf95
NIS		 1121}
1122
0c4f7ff0
NIS		 1123void
1124Perl_boot_core_PerlIO(pTHX)
1125{
1126#ifdef USE_ATTRIBUTES_FOR_PERLIO
14a5cf38
JH		 1127 newXS("io::MODIFY_SCALAR_ATTRIBUTES", XS_io_MODIFY_SCALAR_ATTRIBUTES,
1128 __FILE__);
0c4f7ff0 1129#endif
14a5cf38 1130 newXS("PerlIO::Layer::find", XS_PerlIO__Layer__find, __FILE__);
c9bca74a 1131 newXS("PerlIO::Layer::NoWarnings", XS_PerlIO__Layer__NoWarnings, __FILE__);
0c4f7ff0 1132}
e3f3bf95
NIS		 1133
1134PerlIO_funcs *
1135PerlIO_default_layer(pTHX_ I32 n)
1136{
14a5cf38
JH		 1137 PerlIO_list_t *av = PerlIO_default_layers(aTHX);
1138 if (n < 0)
1139 n += av->cur;
27da23d5 1140 return PerlIO_layer_fetch(aTHX_ av, n, PERLIO_FUNCS_CAST(&PerlIO_stdio));
f3862f8b
NIS		 1141}
1142
a999f61b
NIS		 1143#define PerlIO_default_top() PerlIO_default_layer(aTHX_ -1)
1144#define PerlIO_default_btm() PerlIO_default_layer(aTHX_ 0)
60382766
NIS		 1145
1146void
1141d9f8 1147PerlIO_stdstreams(pTHX)
60382766 1148{
a1ea730d 1149 if (!PL_perlio) {
14a5cf38
JH		 1150 PerlIO_allocate(aTHX);
1151 PerlIO_fdopen(0, "Ir" PERLIO_STDTEXT);
1152 PerlIO_fdopen(1, "Iw" PERLIO_STDTEXT);
1153 PerlIO_fdopen(2, "Iw" PERLIO_STDTEXT);
1154 }
60382766
NIS		 1155}
1156
1157PerlIO *
27da23d5 1158PerlIO_push(pTHX_ PerlIO *f, PERLIO_FUNCS_DECL(*tab), const char *mode, SV *arg)
14a5cf38 1159{
2dc2558e
NIS		 1160 if (tab->fsize != sizeof(PerlIO_funcs)) {
1161 mismatch:
1162 Perl_croak(aTHX_ "Layer does not match this perl");
1163 }
1164 if (tab->size) {
b464bac0 1165 PerlIOl *l;
2dc2558e
NIS		 1166 if (tab->size < sizeof(PerlIOl)) {
1167 goto mismatch;
1168 }
1169 /* Real layer with a data area */
a02a5408 1170 Newxc(l,tab->size,char,PerlIOl);
2dc2558e
NIS		 1171 if (l && f) {
1172 Zero(l, tab->size, char);
1173 l->next = *f;
27da23d5 1174 l->tab = (PerlIO_funcs*) tab;
2dc2558e
NIS		 1175 *f = l;
1176 PerlIO_debug("PerlIO_push f=%p %s %s %p\n", (void*)f, tab->name,
1177 (mode) ? mode : "(Null)", (void*)arg);
210e727c 1178 if (*l->tab->Pushed &&
27da23d5 1179 (*l->tab->Pushed) (aTHX_ f, mode, arg, (PerlIO_funcs*) tab) != 0) {
2dc2558e
NIS		 1180 PerlIO_pop(aTHX_ f);
1181 return NULL;
1182 }
1183 }
1184 }
1185 else if (f) {
1186 /* Pseudo-layer where push does its own stack adjust */
00f51856
NIS		 1187 PerlIO_debug("PerlIO_push f=%p %s %s %p\n", (void*)f, tab->name,
1188 (mode) ? mode : "(Null)", (void*)arg);
210e727c 1189 if (tab->Pushed &&
27da23d5 1190 (*tab->Pushed) (aTHX_ f, mode, arg, (PerlIO_funcs*) tab) != 0) {
210e727c 1191 return NULL;
14a5cf38
JH		 1192 }
1193 }
1194 return f;
60382766
NIS		 1195}
1196
dfebf958 1197IV
86e05cf2
NIS		 1198PerlIOBase_binmode(pTHX_ PerlIO *f)
1199{
1200 if (PerlIOValid(f)) {
1201 /* Is layer suitable for raw stream ? */
1202 if (PerlIOBase(f)->tab->kind & PERLIO_K_RAW) {
1203 /* Yes - turn off UTF-8-ness, to undo UTF-8 locale effects */
1204 PerlIOBase(f)->flags &= ~PERLIO_F_UTF8;
1205 }
1206 else {
1207 /* Not suitable - pop it */
1208 PerlIO_pop(aTHX_ f);
1209 }
1210 return 0;
1211 }
1212 return -1;
1213}
1214
1215IV
2dc2558e 1216PerlIORaw_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
dfebf958 1217{
8772537c
AL		 1218 PERL_UNUSED_ARG(mode);
1219 PERL_UNUSED_ARG(arg);
1220 PERL_UNUSED_ARG(tab);
86e05cf2 1221
04892f78 1222 if (PerlIOValid(f)) {
86e05cf2 1223 PerlIO *t;
de009b76 1224 const PerlIOl *l;
14a5cf38 1225 PerlIO_flush(f);
86e05cf2
NIS		 1226 /*
1227 * Strip all layers that are not suitable for a raw stream
1228 */
1229 t = f;
1230 while (t && (l = *t)) {
1231 if (l->tab->Binmode) {
1232 /* Has a handler - normal case */
1233 if ((*l->tab->Binmode)(aTHX_ f) == 0) {
1234 if (*t == l) {
1235 /* Layer still there - move down a layer */
1236 t = PerlIONext(t);
1237 }
1238 }
1239 else {
1240 return -1;
1241 }
14a5cf38
JH		 1242 }
1243 else {
86e05cf2
NIS		 1244 /* No handler - pop it */
1245 PerlIO_pop(aTHX_ t);
14a5cf38
JH		 1246 }
1247 }
86e05cf2
NIS		 1248 if (PerlIOValid(f)) {
1249 PerlIO_debug(":raw f=%p :%s\n", (void*)f, PerlIOBase(f)->tab->name);
1250 return 0;
1251 }
14a5cf38
JH		 1252 }
1253 return -1;
dfebf958
NIS		 1254}
1255
ac27b0f5 1256int
14a5cf38 1257PerlIO_apply_layera(pTHX_ PerlIO *f, const char *mode,
d9dac8cd 1258 PerlIO_list_t *layers, IV n, IV max)
14a5cf38 1259{
14a5cf38
JH		 1260 int code = 0;
1261 while (n < max) {
8772537c 1262 PerlIO_funcs * const tab = PerlIO_layer_fetch(aTHX_ layers, n, NULL);
14a5cf38
JH		 1263 if (tab) {
1264 if (!PerlIO_push(aTHX_ f, tab, mode, PerlIOArg)) {
1265 code = -1;
1266 break;
1267 }
1268 }
1269 n++;
1270 }
1271 return code;
e3f3bf95
NIS		 1272}
1273
1274int
ac27b0f5
NIS		 1275PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
1276{
14a5cf38 1277 int code = 0;
53f1b6d2 1278 if (f && names) {
8772537c 1279 PerlIO_list_t * const layers = PerlIO_list_alloc(aTHX);
14a5cf38
JH		 1280 code = PerlIO_parse_layers(aTHX_ layers, names);
1281 if (code == 0) {
d9dac8cd 1282 code = PerlIO_apply_layera(aTHX_ f, mode, layers, 0, layers->cur);
14a5cf38 1283 }
3a1ee7e8 1284 PerlIO_list_free(aTHX_ layers);
ac27b0f5 1285 }
14a5cf38 1286 return code;
ac27b0f5
NIS		 1287}
1288
f3862f8b 1289
60382766 1290/*--------------------------------------------------------------------------------------*/
14a5cf38 1291/*
71200d45 1292 * Given the abstraction above the public API functions
14a5cf38 1293 */
60382766
NIS		 1294
1295int
f5b9d040 1296PerlIO_binmode(pTHX_ PerlIO *f, int iotype, int mode, const char *names)
76ced9ad 1297{
14a5cf38 1298 PerlIO_debug("PerlIO_binmode f=%p %s %c %x %s\n",
fe5a182c 1299 (void*)f, PerlIOBase(f)->tab->name, iotype, mode,
14a5cf38 1300 (names) ? names : "(Null)");
03c0554d
NIS		 1301 if (names) {
1302 /* Do not flush etc. if (e.g.) switching encodings.
1303 if a pushed layer knows it needs to flush lower layers
1304 (for example :unix which is never going to call them)
1305 it can do the flush when it is pushed.
1306 */
1307 return PerlIO_apply_layers(aTHX_ f, NULL, names) == 0 ? TRUE : FALSE;
1308 }
1309 else {
86e05cf2 1310 /* Fake 5.6 legacy of using this call to turn ON O_TEXT */
35990314 1311#ifdef PERLIO_USING_CRLF
03c0554d
NIS		 1312 /* Legacy binmode only has meaning if O_TEXT has a value distinct from
1313 O_BINARY so we can look for it in mode.
1314 */
1315 if (!(mode & O_BINARY)) {
1316 /* Text mode */
86e05cf2
NIS		 1317 /* FIXME?: Looking down the layer stack seems wrong,
1318 but is a way of reaching past (say) an encoding layer
1319 to flip CRLF-ness of the layer(s) below
1320 */
03c0554d
NIS		 1321 while (*f) {
1322 /* Perhaps we should turn on bottom-most aware layer
1323 e.g. Ilya's idea that UNIX TTY could serve
1324 */
1325 if (PerlIOBase(f)->tab->kind & PERLIO_K_CANCRLF) {
1326 if (!(PerlIOBase(f)->flags & PERLIO_F_CRLF)) {
1327 /* Not in text mode - flush any pending stuff and flip it */
1328 PerlIO_flush(f);
1329 PerlIOBase(f)->flags |= PERLIO_F_CRLF;
1330 }
1331 /* Only need to turn it on in one layer so we are done */
1332 return TRUE;
ed53a2bb 1333 }
03c0554d 1334 f = PerlIONext(f);
14a5cf38 1335 }
03c0554d
NIS		 1336 /* Not finding a CRLF aware layer presumably means we are binary
1337 which is not what was requested - so we failed
1338 We _could_ push :crlf layer but so could caller
1339 */
1340 return FALSE;
14a5cf38 1341 }
6ce75a77 1342#endif
86e05cf2
NIS		 1343 /* Legacy binmode is now _defined_ as being equivalent to pushing :raw
1344 So code that used to be here is now in PerlIORaw_pushed().
03c0554d 1345 */
27da23d5 1346 return PerlIO_push(aTHX_ f, PERLIO_FUNCS_CAST(&PerlIO_raw), Nullch, Nullsv) ? TRUE : FALSE;
14a5cf38 1347 }
f5b9d040
NIS		 1348}
1349
f5b9d040 1350int
e87a358a 1351PerlIO__close(pTHX_ PerlIO *f)
f5b9d040 1352{
37725cdc
NIS		 1353 if (PerlIOValid(f)) {
1354 PerlIO_funcs *tab = PerlIOBase(f)->tab;
1355 if (tab && tab->Close)
1356 return (*tab->Close)(aTHX_ f);
1357 else
1358 return PerlIOBase_close(aTHX_ f);
1359 }
14a5cf38 1360 else {
93189314 1361 SETERRNO(EBADF, SS_IVCHAN);
14a5cf38
JH		 1362 return -1;
1363 }
76ced9ad
NIS		 1364}
1365
b931b1d9 1366int
e87a358a 1367Perl_PerlIO_close(pTHX_ PerlIO *f)
b931b1d9 1368{
de009b76 1369 const int code = PerlIO__close(aTHX_ f);
37725cdc
NIS		 1370 while (PerlIOValid(f)) {
1371 PerlIO_pop(aTHX_ f);
f6c77cf1 1372 }
14a5cf38 1373 return code;
b931b1d9
NIS		 1374}
1375
b931b1d9 1376int
e87a358a 1377Perl_PerlIO_fileno(pTHX_ PerlIO *f)
b931b1d9 1378{
b32dd47e 1379 Perl_PerlIO_or_Base(f, Fileno, fileno, -1, (aTHX_ f));
b931b1d9
NIS		 1380}
1381
1141d9f8
NIS		 1382static const char *
1383PerlIO_context_layers(pTHX_ const char *mode)
1384{
14a5cf38
JH		 1385 const char *type = NULL;
1386 /*
71200d45 1387 * Need to supply default layer info from open.pm
14a5cf38
JH		 1388 */
1389 if (PL_curcop) {
1390 SV *layers = PL_curcop->cop_io;
1391 if (layers) {
1392 STRLEN len;
b83604b4 1393 type = SvPV_const(layers, len);
14a5cf38
JH		 1394 if (type && mode[0] != 'r') {
1395 /*
71200d45 1396 * Skip to write part
14a5cf38
JH		 1397 */
1398 const char *s = strchr(type, 0);
eb160463 1399 if (s && (STRLEN)(s - type) < len) {
14a5cf38
JH		 1400 type = s + 1;
1401 }
1402 }
1403 }
1404 }
1405 return type;
1141d9f8
NIS		 1406}
1407
fcf2db38 1408static PerlIO_funcs *
2edd7e44
NIS		 1409PerlIO_layer_from_ref(pTHX_ SV *sv)
1410{
14a5cf38 1411 /*
71200d45 1412 * For any scalar type load the handler which is bundled with perl
14a5cf38
JH		 1413 */
1414 if (SvTYPE(sv) < SVt_PVAV)
e934609f 1415 return PerlIO_find_layer(aTHX_ "scalar", 6, 1);
14a5cf38
JH		 1416
1417 /*
71200d45 1418 * For other types allow if layer is known but don't try and load it
14a5cf38
JH		 1419 */
1420 switch (SvTYPE(sv)) {
1421 case SVt_PVAV:
1422 return PerlIO_find_layer(aTHX_ "Array", 5, 0);
1423 case SVt_PVHV:
1424 return PerlIO_find_layer(aTHX_ "Hash", 4, 0);
1425 case SVt_PVCV:
1426 return PerlIO_find_layer(aTHX_ "Code", 4, 0);
1427 case SVt_PVGV:
1428 return PerlIO_find_layer(aTHX_ "Glob", 4, 0);
1429 }
1430 return NULL;
2edd7e44
NIS		 1431}
1432
fcf2db38 1433PerlIO_list_t *
14a5cf38
JH		 1434PerlIO_resolve_layers(pTHX_ const char *layers,
1435 const char *mode, int narg, SV **args)
1436{
1437 PerlIO_list_t *def = PerlIO_default_layers(aTHX);
1438 int incdef = 1;
a1ea730d 1439 if (!PL_perlio)
14a5cf38
JH		 1440 PerlIO_stdstreams(aTHX);
1441 if (narg) {
1442 SV *arg = *args;
1443 /*
71200d45
NIS		 1444 * If it is a reference but not an object see if we have a handler
1445 * for it
14a5cf38
JH		 1446 */
1447 if (SvROK(arg) && !sv_isobject(arg)) {
1448 PerlIO_funcs *handler = PerlIO_layer_from_ref(aTHX_ SvRV(arg));
1449 if (handler) {
3a1ee7e8
NIS		 1450 def = PerlIO_list_alloc(aTHX);
1451 PerlIO_list_push(aTHX_ def, handler, &PL_sv_undef);
14a5cf38
JH		 1452 incdef = 0;
1453 }
1454 /*
e934609f 1455 * Don't fail if handler cannot be found :via(...) etc. may do
14a5cf38 1456 * something sensible else we will just stringfy and open
71200d45 1457 * resulting string.
14a5cf38
JH		 1458 */
1459 }
1460 }
1461 if (!layers)
1462 layers = PerlIO_context_layers(aTHX_ mode);
1463 if (layers && *layers) {
1464 PerlIO_list_t *av;
1465 if (incdef) {
de009b76 1466 IV i;
3a1ee7e8 1467 av = PerlIO_list_alloc(aTHX);
14a5cf38 1468 for (i = 0; i < def->cur; i++) {
3a1ee7e8 1469 PerlIO_list_push(aTHX_ av, def->array[i].funcs,
14a5cf38
JH		 1470 def->array[i].arg);
1471 }
1472 }
1473 else {
1474 av = def;
1475 }
0cff2cf3
NIS		 1476 if (PerlIO_parse_layers(aTHX_ av, layers) == 0) {
1477 return av;
1478 }
1479 else {
1480 PerlIO_list_free(aTHX_ av);
1481 return (PerlIO_list_t *) NULL;
1482 }
14a5cf38
JH		 1483 }
1484 else {
1485 if (incdef)
1486 def->refcnt++;
1487 return def;
1488 }
ee518936
NIS		 1489}
1490
1491PerlIO *
14a5cf38
JH		 1492PerlIO_openn(pTHX_ const char *layers, const char *mode, int fd,
1493 int imode, int perm, PerlIO *f, int narg, SV **args)
1494{
1495 if (!f && narg == 1 && *args == &PL_sv_undef) {
1496 if ((f = PerlIO_tmpfile())) {
1497 if (!layers)
1498 layers = PerlIO_context_layers(aTHX_ mode);
1499 if (layers && *layers)
1500 PerlIO_apply_layers(aTHX_ f, mode, layers);
1501 }
1502 }
1503 else {
de009b76 1504 PerlIO_list_t *layera;
14a5cf38
JH		 1505 IV n;
1506 PerlIO_funcs *tab = NULL;
04892f78 1507 if (PerlIOValid(f)) {
14a5cf38 1508 /*
71200d45
NIS		 1509 * This is "reopen" - it is not tested as perl does not use it
1510 * yet
14a5cf38
JH		 1511 */
1512 PerlIOl *l = *f;
3a1ee7e8 1513 layera = PerlIO_list_alloc(aTHX);
14a5cf38 1514 while (l) {
04892f78
NIS		 1515 SV *arg = (l->tab->Getarg)
1516 ? (*l->tab->Getarg) (aTHX_ &l, NULL, 0)
1517 : &PL_sv_undef;
3a1ee7e8 1518 PerlIO_list_push(aTHX_ layera, l->tab, arg);
14a5cf38
JH		 1519 l = *PerlIONext(&l);
1520 }
1521 }
1522 else {
1523 layera = PerlIO_resolve_layers(aTHX_ layers, mode, narg, args);
0cff2cf3
NIS		 1524 if (!layera) {
1525 return NULL;
1526 }
14a5cf38
JH		 1527 }
1528 /*
71200d45 1529 * Start at "top" of layer stack
14a5cf38
JH		 1530 */
1531 n = layera->cur - 1;
1532 while (n >= 0) {
1533 PerlIO_funcs *t = PerlIO_layer_fetch(aTHX_ layera, n, NULL);
1534 if (t && t->Open) {
1535 tab = t;
1536 break;
1537 }
1538 n--;
1539 }
1540 if (tab) {
1541 /*
71200d45 1542 * Found that layer 'n' can do opens - call it
14a5cf38 1543 */
7cf31beb 1544 if (narg > 1 && !(tab->kind & PERLIO_K_MULTIARG)) {
3b8752bb 1545 Perl_croak(aTHX_ "More than one argument to open(,':%s')",tab->name);
7cf31beb 1546 }
14a5cf38 1547 PerlIO_debug("openn(%s,'%s','%s',%d,%x,%o,%p,%d,%p)\n",
fe5a182c
JH		 1548 tab->name, layers, mode, fd, imode, perm,
1549 (void*)f, narg, (void*)args);
210e727c
JH		 1550 if (tab->Open)
1551 f = (*tab->Open) (aTHX_ tab, layera, n, mode, fd, imode, perm,
1552 f, narg, args);
1553 else {
1554 SETERRNO(EINVAL, LIB_INVARG);
1555 f = NULL;
1556 }
14a5cf38
JH		 1557 if (f) {
1558 if (n + 1 < layera->cur) {
1559 /*
1560 * More layers above the one that we used to open -
71200d45 1561 * apply them now
14a5cf38 1562 */
d9dac8cd
NIS		 1563 if (PerlIO_apply_layera(aTHX_ f, mode, layera, n + 1, layera->cur) != 0) {
1564 /* If pushing layers fails close the file */
1565 PerlIO_close(f);
14a5cf38
JH		 1566 f = NULL;
1567 }
1568 }
1569 }
1570 }
3a1ee7e8 1571 PerlIO_list_free(aTHX_ layera);
14a5cf38
JH		 1572 }
1573 return f;
ee518936 1574}
b931b1d9
NIS		 1575
1576
9e353e3b 1577SSize_t
e87a358a 1578Perl_PerlIO_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
6f9d8c32 1579{
b32dd47e 1580 Perl_PerlIO_or_Base(f, Read, read, -1, (aTHX_ f, vbuf, count));
760ac839
LW		 1581}
1582
313ca112 1583SSize_t
e87a358a 1584Perl_PerlIO_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
760ac839 1585{
b32dd47e 1586 Perl_PerlIO_or_Base(f, Unread, unread, -1, (aTHX_ f, vbuf, count));
760ac839
LW		 1587}
1588
9e353e3b 1589SSize_t
e87a358a 1590Perl_PerlIO_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
760ac839 1591{
b32dd47e 1592 Perl_PerlIO_or_fail(f, Write, -1, (aTHX_ f, vbuf, count));
760ac839
LW		 1593}
1594
6f9d8c32 1595int
e87a358a 1596Perl_PerlIO_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
760ac839 1597{
b32dd47e 1598 Perl_PerlIO_or_fail(f, Seek, -1, (aTHX_ f, offset, whence));
760ac839
LW		 1599}
1600
9e353e3b 1601Off_t
e87a358a 1602Perl_PerlIO_tell(pTHX_ PerlIO *f)
760ac839 1603{
b32dd47e 1604 Perl_PerlIO_or_fail(f, Tell, -1, (aTHX_ f));
760ac839
LW		 1605}
1606
6f9d8c32 1607int
e87a358a 1608Perl_PerlIO_flush(pTHX_ PerlIO *f)
760ac839 1609{
14a5cf38
JH		 1610 if (f) {
1611 if (*f) {
de009b76 1612 const PerlIO_funcs *tab = PerlIOBase(f)->tab;
1b7a0411
JH		 1613
1614 if (tab && tab->Flush)
f62ce20a 1615 return (*tab->Flush) (aTHX_ f);
1b7a0411
JH		 1616 else
1617 return 0; /* If no Flush defined, silently succeed. */
14a5cf38
JH		 1618 }
1619 else {
fe5a182c 1620 PerlIO_debug("Cannot flush f=%p\n", (void*)f);
93189314 1621 SETERRNO(EBADF, SS_IVCHAN);
14a5cf38
JH		 1622 return -1;
1623 }
1624 }
1625 else {
1626 /*
1627 * Is it good API design to do flush-all on NULL, a potentially
1628 * errorneous input? Maybe some magical value (PerlIO*
1629 * PERLIO_FLUSH_ALL = (PerlIO*)-1;)? Yes, stdio does similar
1630 * things on fflush(NULL), but should we be bound by their design
71200d45 1631 * decisions? --jhi
14a5cf38 1632 */
a1ea730d 1633 PerlIO **table = &PL_perlio;
14a5cf38
JH		 1634 int code = 0;
1635 while ((f = *table)) {
1636 int i;
1637 table = (PerlIO **) (f++);
1638 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
1639 if (*f && PerlIO_flush(f) != 0)
1640 code = -1;
1641 f++;
1642 }
1643 }
1644 return code;
1645 }
760ac839
LW		 1646}
1647
a9c883f6 1648void
f62ce20a 1649PerlIOBase_flush_linebuf(pTHX)
a9c883f6 1650{
a1ea730d 1651 PerlIO **table = &PL_perlio;
14a5cf38
JH		 1652 PerlIO *f;
1653 while ((f = *table)) {
1654 int i;
1655 table = (PerlIO **) (f++);
1656 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
1657 if (*f
1658 && (PerlIOBase(f)->
1659 flags & (PERLIO_F_LINEBUF | PERLIO_F_CANWRITE))
1660 == (PERLIO_F_LINEBUF | PERLIO_F_CANWRITE))
1661 PerlIO_flush(f);
1662 f++;
1663 }
a9c883f6 1664 }
a9c883f6
NIS		 1665}
1666
06da4f11 1667int
e87a358a 1668Perl_PerlIO_fill(pTHX_ PerlIO *f)
06da4f11 1669{
b32dd47e 1670 Perl_PerlIO_or_fail(f, Fill, -1, (aTHX_ f));
06da4f11
NIS		 1671}
1672
f3862f8b
NIS		 1673int
1674PerlIO_isutf8(PerlIO *f)
1675{
1b7a0411
JH		 1676 if (PerlIOValid(f))
1677 return (PerlIOBase(f)->flags & PERLIO_F_UTF8) != 0;
1678 else
1679 SETERRNO(EBADF, SS_IVCHAN);
37725cdc 1680
1b7a0411 1681 return -1;
f3862f8b
NIS		 1682}
1683
6f9d8c32 1684int
e87a358a 1685Perl_PerlIO_eof(pTHX_ PerlIO *f)
760ac839 1686{
b32dd47e 1687 Perl_PerlIO_or_Base(f, Eof, eof, -1, (aTHX_ f));
9e353e3b
NIS		 1688}
1689
9e353e3b 1690int
e87a358a 1691Perl_PerlIO_error(pTHX_ PerlIO *f)
9e353e3b 1692{
b32dd47e 1693 Perl_PerlIO_or_Base(f, Error, error, -1, (aTHX_ f));
9e353e3b
NIS		 1694}
1695
9e353e3b 1696void
e87a358a 1697Perl_PerlIO_clearerr(pTHX_ PerlIO *f)
9e353e3b 1698{
b32dd47e 1699 Perl_PerlIO_or_Base_void(f, Clearerr, clearerr, (aTHX_ f));
9e353e3b
NIS		 1700}
1701
9e353e3b 1702void
e87a358a 1703Perl_PerlIO_setlinebuf(pTHX_ PerlIO *f)
9e353e3b 1704{
b32dd47e 1705 Perl_PerlIO_or_Base_void(f, Setlinebuf, setlinebuf, (aTHX_ f));
9e353e3b
NIS		 1706}
1707
9e353e3b
NIS		 1708int
1709PerlIO_has_base(PerlIO *f)
1710{
1b7a0411 1711 if (PerlIOValid(f)) {
de009b76 1712 const PerlIO_funcs *tab = PerlIOBase(f)->tab;
1b7a0411
JH		 1713
1714 if (tab)
1715 return (tab->Get_base != NULL);
1716 SETERRNO(EINVAL, LIB_INVARG);
1717 }
1718 else
1719 SETERRNO(EBADF, SS_IVCHAN);
1720
1721 return 0;
760ac839
LW		 1722}
1723
9e353e3b
NIS		 1724int
1725PerlIO_fast_gets(PerlIO *f)
760ac839 1726{
04892f78 1727 if (PerlIOValid(f) && (PerlIOBase(f)->flags & PERLIO_F_FASTGETS)) {
de009b76 1728 const PerlIO_funcs *tab = PerlIOBase(f)->tab;
1b7a0411
JH		 1729
1730 if (tab)
1731 return (tab->Set_ptrcnt != NULL);
1732 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38 1733 }
1b7a0411
JH		 1734 else
1735 SETERRNO(EBADF, SS_IVCHAN);
1736
14a5cf38 1737 return 0;
9e353e3b
NIS		 1738}
1739
9e353e3b
NIS		 1740int
1741PerlIO_has_cntptr(PerlIO *f)
1742{
04892f78 1743 if (PerlIOValid(f)) {
de009b76 1744 const PerlIO_funcs *tab = PerlIOBase(f)->tab;
1b7a0411
JH		 1745
1746 if (tab)
1747 return (tab->Get_ptr != NULL && tab->Get_cnt != NULL);
1748 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38 1749 }
1b7a0411
JH		 1750 else
1751 SETERRNO(EBADF, SS_IVCHAN);
1752
14a5cf38 1753 return 0;
9e353e3b
NIS		 1754}
1755
9e353e3b
NIS		 1756int
1757PerlIO_canset_cnt(PerlIO *f)
1758{
04892f78 1759 if (PerlIOValid(f)) {
de009b76 1760 const PerlIO_funcs *tab = PerlIOBase(f)->tab;
1b7a0411
JH		 1761
1762 if (tab)
1763 return (tab->Set_ptrcnt != NULL);
1764 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38 1765 }
1b7a0411
JH		 1766 else
1767 SETERRNO(EBADF, SS_IVCHAN);
1768
14a5cf38 1769 return 0;
760ac839
LW		 1770}
1771
888911fc 1772STDCHAR *
e87a358a 1773Perl_PerlIO_get_base(pTHX_ PerlIO *f)
760ac839 1774{
b32dd47e 1775 Perl_PerlIO_or_fail(f, Get_base, NULL, (aTHX_ f));
9e353e3b
NIS		 1776}
1777
9e353e3b 1778int
e87a358a 1779Perl_PerlIO_get_bufsiz(pTHX_ PerlIO *f)
9e353e3b 1780{
b32dd47e 1781 Perl_PerlIO_or_fail(f, Get_bufsiz, -1, (aTHX_ f));
9e353e3b
NIS		 1782}
1783
9e353e3b 1784STDCHAR *
e87a358a 1785Perl_PerlIO_get_ptr(pTHX_ PerlIO *f)
9e353e3b 1786{
b32dd47e 1787 Perl_PerlIO_or_fail(f, Get_ptr, NULL, (aTHX_ f));
9e353e3b
NIS		 1788}
1789
05d1247b 1790int
e87a358a 1791Perl_PerlIO_get_cnt(pTHX_ PerlIO *f)
9e353e3b 1792{
b32dd47e 1793 Perl_PerlIO_or_fail(f, Get_cnt, -1, (aTHX_ f));
9e353e3b
NIS		 1794}
1795
9e353e3b 1796void
e87a358a 1797Perl_PerlIO_set_cnt(pTHX_ PerlIO *f, int cnt)
9e353e3b 1798{
b32dd47e 1799 Perl_PerlIO_or_fail_void(f, Set_ptrcnt, (aTHX_ f, NULL, cnt));
9e353e3b
NIS		 1800}
1801
9e353e3b 1802void
e87a358a 1803Perl_PerlIO_set_ptrcnt(pTHX_ PerlIO *f, STDCHAR * ptr, int cnt)
9e353e3b 1804{
b32dd47e 1805 Perl_PerlIO_or_fail_void(f, Set_ptrcnt, (aTHX_ f, ptr, cnt));
9e353e3b
NIS		 1806}
1807
4ec2216f 1808
9e353e3b 1809/*--------------------------------------------------------------------------------------*/
14a5cf38 1810/*
71200d45 1811 * utf8 and raw dummy layers
14a5cf38 1812 */
dfebf958 1813
26fb694e 1814IV
2dc2558e 1815PerlIOUtf8_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
26fb694e 1816{
8772537c
AL		 1817 PERL_UNUSED_ARG(mode);
1818 PERL_UNUSED_ARG(arg);
00f51856 1819 if (PerlIOValid(f)) {
14a5cf38
JH		 1820 if (tab->kind & PERLIO_K_UTF8)
1821 PerlIOBase(f)->flags |= PERLIO_F_UTF8;
1822 else
1823 PerlIOBase(f)->flags &= ~PERLIO_F_UTF8;
1824 return 0;
1825 }
1826 return -1;
26fb694e
NIS		 1827}
1828
27da23d5 1829PERLIO_FUNCS_DECL(PerlIO_utf8) = {
2dc2558e 1830 sizeof(PerlIO_funcs),
14a5cf38 1831 "utf8",
2dc2558e 1832 0,
6874a2de 1833 PERLIO_K_DUMMY | PERLIO_K_UTF8,
14a5cf38
JH		 1834 PerlIOUtf8_pushed,
1835 NULL,
1836 NULL,
1837 NULL,
1838 NULL,
1839 NULL,
1840 NULL,
1841 NULL,
1842 NULL,
1843 NULL,
1844 NULL,
de009b76
AL		 1845 NULL,
1846 NULL,
22569500
NIS		 1847 NULL, /* flush */
1848 NULL, /* fill */
14a5cf38
JH		 1849 NULL,
1850 NULL,
1851 NULL,
1852 NULL,
22569500
NIS		 1853 NULL, /* get_base */
1854 NULL, /* get_bufsiz */
1855 NULL, /* get_ptr */
1856 NULL, /* get_cnt */
1857 NULL, /* set_ptrcnt */
26fb694e
NIS		 1858};
1859
27da23d5 1860PERLIO_FUNCS_DECL(PerlIO_byte) = {
2dc2558e 1861 sizeof(PerlIO_funcs),
14a5cf38 1862 "bytes",
2dc2558e 1863 0,
14a5cf38
JH		 1864 PERLIO_K_DUMMY,
1865 PerlIOUtf8_pushed,
1866 NULL,
1867 NULL,
1868 NULL,
1869 NULL,
1870 NULL,
1871 NULL,
1872 NULL,
1873 NULL,
1874 NULL,
1875 NULL,
de009b76
AL		 1876 NULL,
1877 NULL,
22569500
NIS		 1878 NULL, /* flush */
1879 NULL, /* fill */
14a5cf38
JH		 1880 NULL,
1881 NULL,
1882 NULL,
1883 NULL,
22569500
NIS		 1884 NULL, /* get_base */
1885 NULL, /* get_bufsiz */
1886 NULL, /* get_ptr */
1887 NULL, /* get_cnt */
1888 NULL, /* set_ptrcnt */
dfebf958
NIS		 1889};
1890
1891PerlIO *
14a5cf38
JH		 1892PerlIORaw_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers,
1893 IV n, const char *mode, int fd, int imode, int perm,
1894 PerlIO *old, int narg, SV **args)
dfebf958 1895{
8772537c
AL		 1896 PerlIO_funcs * const tab = PerlIO_default_btm();
1897 PERL_UNUSED_ARG(self);
210e727c
JH		 1898 if (tab && tab->Open)
1899 return (*tab->Open) (aTHX_ tab, layers, n - 1, mode, fd, imode, perm,
1900 old, narg, args);
1901 SETERRNO(EINVAL, LIB_INVARG);
1902 return NULL;
dfebf958
NIS		 1903}
1904
27da23d5 1905PERLIO_FUNCS_DECL(PerlIO_raw) = {
2dc2558e 1906 sizeof(PerlIO_funcs),
14a5cf38 1907 "raw",
2dc2558e 1908 0,
14a5cf38
JH		 1909 PERLIO_K_DUMMY,
1910 PerlIORaw_pushed,
1911 PerlIOBase_popped,
1912 PerlIORaw_open,
1913 NULL,
1914 NULL,
1915 NULL,
1916 NULL,
1917 NULL,
1918 NULL,
1919 NULL,
1920 NULL,
de009b76
AL		 1921 NULL,
1922 NULL,
22569500
NIS		 1923 NULL, /* flush */
1924 NULL, /* fill */
14a5cf38
JH		 1925 NULL,
1926 NULL,
1927 NULL,
1928 NULL,
22569500
NIS		 1929 NULL, /* get_base */
1930 NULL, /* get_bufsiz */
1931 NULL, /* get_ptr */
1932 NULL, /* get_cnt */
1933 NULL, /* set_ptrcnt */
dfebf958
NIS		 1934};
1935/*--------------------------------------------------------------------------------------*/
1936/*--------------------------------------------------------------------------------------*/
14a5cf38 1937/*
71200d45 1938 * "Methods" of the "base class"
14a5cf38 1939 */
9e353e3b
NIS		 1940
1941IV
f62ce20a 1942PerlIOBase_fileno(pTHX_ PerlIO *f)
9e353e3b 1943{
04892f78 1944 return PerlIOValid(f) ? PerlIO_fileno(PerlIONext(f)) : -1;
9e353e3b
NIS		 1945}
1946
f5b9d040 1947char *
81428673 1948PerlIO_modestr(PerlIO * f, char *buf)
14a5cf38
JH		 1949{
1950 char *s = buf;
81428673 1951 if (PerlIOValid(f)) {
de009b76 1952 const IV flags = PerlIOBase(f)->flags;
81428673
NIS		 1953 if (flags & PERLIO_F_APPEND) {
1954 *s++ = 'a';
1955 if (flags & PERLIO_F_CANREAD) {
1956 *s++ = '+';
1957 }
14a5cf38 1958 }
81428673
NIS		 1959 else if (flags & PERLIO_F_CANREAD) {
1960 *s++ = 'r';
1961 if (flags & PERLIO_F_CANWRITE)
1962 *s++ = '+';
1963 }
1964 else if (flags & PERLIO_F_CANWRITE) {
1965 *s++ = 'w';
1966 if (flags & PERLIO_F_CANREAD) {
1967 *s++ = '+';
1968 }
14a5cf38 1969 }
35990314 1970#ifdef PERLIO_USING_CRLF
81428673
NIS		 1971 if (!(flags & PERLIO_F_CRLF))
1972 *s++ = 'b';
5f1a76d0 1973#endif
81428673 1974 }
14a5cf38
JH		 1975 *s = '\0';
1976 return buf;
f5b9d040
NIS		 1977}
1978
81428673 1979
76ced9ad 1980IV
2dc2558e 1981PerlIOBase_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
9e353e3b 1982{
de009b76 1983 PerlIOl * const l = PerlIOBase(f);
8772537c 1984 PERL_UNUSED_ARG(arg);
de009b76 1985
14a5cf38
JH		 1986 l->flags &= ~(PERLIO_F_CANREAD | PERLIO_F_CANWRITE |
1987 PERLIO_F_TRUNCATE | PERLIO_F_APPEND);
1988 if (tab->Set_ptrcnt != NULL)
1989 l->flags |= PERLIO_F_FASTGETS;
1990 if (mode) {
3b6c1aba 1991 if (*mode == IoTYPE_NUMERIC || *mode == IoTYPE_IMPLICIT)
14a5cf38
JH		 1992 mode++;
1993 switch (*mode++) {
1994 case 'r':
1995 l->flags |= PERLIO_F_CANREAD;
1996 break;
1997 case 'a':
1998 l->flags |= PERLIO_F_APPEND | PERLIO_F_CANWRITE;
1999 break;
2000 case 'w':
2001 l->flags |= PERLIO_F_TRUNCATE | PERLIO_F_CANWRITE;
2002 break;
2003 default:
93189314 2004 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH		 2005 return -1;
2006 }
2007 while (*mode) {
2008 switch (*mode++) {
2009 case '+':
2010 l->flags |= PERLIO_F_CANREAD | PERLIO_F_CANWRITE;
2011 break;
2012 case 'b':
2013 l->flags &= ~PERLIO_F_CRLF;
2014 break;
2015 case 't':
2016 l->flags |= PERLIO_F_CRLF;
2017 break;
2018 default:
93189314 2019 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH		 2020 return -1;
2021 }
2022 }
2023 }
2024 else {
2025 if (l->next) {
2026 l->flags |= l->next->flags &
2027 (PERLIO_F_CANREAD | PERLIO_F_CANWRITE | PERLIO_F_TRUNCATE |
2028 PERLIO_F_APPEND);
2029 }
2030 }
5e2ab84b 2031#if 0
14a5cf38
JH		 2032 PerlIO_debug("PerlIOBase_pushed f=%p %s %s fl=%08" UVxf " (%s)\n",
2033 f, PerlIOBase(f)->tab->name, (omode) ? omode : "(Null)",
2034 l->flags, PerlIO_modestr(f, temp));
5e2ab84b 2035#endif
14a5cf38 2036 return 0;
76ced9ad
NIS		 2037}
2038
2039IV
f62ce20a 2040PerlIOBase_popped(pTHX_ PerlIO *f)
76ced9ad 2041{
8772537c 2042 PERL_UNUSED_ARG(f);
14a5cf38 2043 return 0;
760ac839
LW		 2044}
2045
9e353e3b 2046SSize_t
f62ce20a 2047PerlIOBase_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 2048{
14a5cf38 2049 /*
71200d45 2050 * Save the position as current head considers it
14a5cf38 2051 */
de009b76 2052 const Off_t old = PerlIO_tell(f);
27da23d5 2053 PerlIO_push(aTHX_ f, PERLIO_FUNCS_CAST(&PerlIO_pending), "r", Nullsv);
14a5cf38 2054 PerlIOSelf(f, PerlIOBuf)->posn = old;
de009b76 2055 return PerlIOBuf_unread(aTHX_ f, vbuf, count);
9e353e3b
NIS		 2056}
2057
f6c77cf1 2058SSize_t
f62ce20a 2059PerlIOBase_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
f6c77cf1 2060{
14a5cf38
JH		 2061 STDCHAR *buf = (STDCHAR *) vbuf;
2062 if (f) {
263df5f1
JH		 2063 if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD)) {
2064 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
2065 SETERRNO(EBADF, SS_IVCHAN);
2066 return 0;
2067 }
14a5cf38
JH		 2068 while (count > 0) {
2069 SSize_t avail = PerlIO_get_cnt(f);
2070 SSize_t take = 0;
2071 if (avail > 0)
eb160463 2072 take = ((SSize_t)count < avail) ? count : avail;
14a5cf38
JH		 2073 if (take > 0) {
2074 STDCHAR *ptr = PerlIO_get_ptr(f);
2075 Copy(ptr, buf, take, STDCHAR);
2076 PerlIO_set_ptrcnt(f, ptr + take, (avail -= take));
2077 count -= take;
2078 buf += take;
2079 }
2080 if (count > 0 && avail <= 0) {
2081 if (PerlIO_fill(f) != 0)
2082 break;
2083 }
2084 }
2085 return (buf - (STDCHAR *) vbuf);
2086 }
f6c77cf1 2087 return 0;
f6c77cf1
NIS		 2088}
2089
9e353e3b 2090IV
f62ce20a 2091PerlIOBase_noop_ok(pTHX_ PerlIO *f)
9e353e3b 2092{
8772537c 2093 PERL_UNUSED_ARG(f);
14a5cf38 2094 return 0;
9e353e3b
NIS		 2095}
2096
2097IV
f62ce20a 2098PerlIOBase_noop_fail(pTHX_ PerlIO *f)
06da4f11 2099{
8772537c 2100 PERL_UNUSED_ARG(f);
14a5cf38 2101 return -1;
06da4f11
NIS		 2102}
2103
2104IV
f62ce20a 2105PerlIOBase_close(pTHX_ PerlIO *f)
9e353e3b 2106{
37725cdc
NIS		 2107 IV code = -1;
2108 if (PerlIOValid(f)) {
2109 PerlIO *n = PerlIONext(f);
2110 code = PerlIO_flush(f);
2111 PerlIOBase(f)->flags &=
2112 ~(PERLIO_F_CANREAD | PERLIO_F_CANWRITE | PERLIO_F_OPEN);
2113 while (PerlIOValid(n)) {
de009b76 2114 const PerlIO_funcs * const tab = PerlIOBase(n)->tab;
37725cdc
NIS		 2115 if (tab && tab->Close) {
2116 if ((*tab->Close)(aTHX_ n) != 0)
2117 code = -1;
2118 break;
2119 }
2120 else {
2121 PerlIOBase(n)->flags &=
2122 ~(PERLIO_F_CANREAD | PERLIO_F_CANWRITE | PERLIO_F_OPEN);
2123 }
2124 n = PerlIONext(n);
2125 }
2126 }
2127 else {
2128 SETERRNO(EBADF, SS_IVCHAN);
2129 }
14a5cf38 2130 return code;
9e353e3b
NIS		 2131}
2132
2133IV
f62ce20a 2134PerlIOBase_eof(pTHX_ PerlIO *f)
9e353e3b 2135{
04892f78 2136 if (PerlIOValid(f)) {
14a5cf38
JH		 2137 return (PerlIOBase(f)->flags & PERLIO_F_EOF) != 0;
2138 }
2139 return 1;
9e353e3b
NIS		 2140}
2141
2142IV
f62ce20a 2143PerlIOBase_error(pTHX_ PerlIO *f)
9e353e3b 2144{
04892f78 2145 if (PerlIOValid(f)) {
14a5cf38
JH		 2146 return (PerlIOBase(f)->flags & PERLIO_F_ERROR) != 0;
2147 }
2148 return 1;
9e353e3b
NIS		 2149}
2150
2151void
f62ce20a 2152PerlIOBase_clearerr(pTHX_ PerlIO *f)
9e353e3b 2153{
04892f78 2154 if (PerlIOValid(f)) {
14a5cf38
JH		 2155 PerlIO *n = PerlIONext(f);
2156 PerlIOBase(f)->flags &= ~(PERLIO_F_ERROR | PERLIO_F_EOF);
04892f78 2157 if (PerlIOValid(n))
14a5cf38
JH		 2158 PerlIO_clearerr(n);
2159 }
9e353e3b
NIS		 2160}
2161
2162void
f62ce20a 2163PerlIOBase_setlinebuf(pTHX_ PerlIO *f)
9e353e3b 2164{
04892f78 2165 if (PerlIOValid(f)) {
14a5cf38
JH		 2166 PerlIOBase(f)->flags |= PERLIO_F_LINEBUF;
2167 }
9e353e3b
NIS		 2168}
2169
93a8090d
NIS		 2170SV *
2171PerlIO_sv_dup(pTHX_ SV *arg, CLONE_PARAMS *param)
2172{
2173 if (!arg)
2174 return Nullsv;
2175#ifdef sv_dup
2176 if (param) {
2177 return sv_dup(arg, param);
2178 }
2179 else {
2180 return newSVsv(arg);
2181 }
2182#else
1b6737cc 2183 PERL_UNUSED_ARG(param);
93a8090d
NIS		 2184 return newSVsv(arg);
2185#endif
2186}
2187
2188PerlIO *
ecdeb87c 2189PerlIOBase_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
93a8090d 2190{
1b6737cc 2191 PerlIO * const nexto = PerlIONext(o);
04892f78 2192 if (PerlIOValid(nexto)) {
de009b76 2193 const PerlIO_funcs * const tab = PerlIOBase(nexto)->tab;
37725cdc
NIS		 2194 if (tab && tab->Dup)
2195 f = (*tab->Dup)(aTHX_ f, nexto, param, flags);
2196 else
2197 f = PerlIOBase_dup(aTHX_ f, nexto, param, flags);
93a8090d
NIS		 2198 }
2199 if (f) {
2200 PerlIO_funcs *self = PerlIOBase(o)->tab;
210e727c 2201 SV *arg;
93a8090d 2202 char buf[8];
fe5a182c
JH		 2203 PerlIO_debug("PerlIOBase_dup %s f=%p o=%p param=%p\n",
2204 self->name, (void*)f, (void*)o, (void*)param);
210e727c
JH		 2205 if (self->Getarg)
2206 arg = (*self->Getarg)(aTHX_ o, param, flags);
2207 else {
37725cdc 2208 arg = Nullsv;
93a8090d
NIS		 2209 }
2210 f = PerlIO_push(aTHX_ f, self, PerlIO_modestr(o,buf), arg);
ecdeb87c 2211 if (arg) {
93a8090d
NIS		 2212 SvREFCNT_dec(arg);
2213 }
2214 }
2215 return f;
2216}
2217
168d5872 2218#ifdef USE_THREADS
93a8090d 2219perl_mutex PerlIO_mutex;
93a8090d 2220#endif
27da23d5
JH		 2221
2222/* PL_perlio_fd_refcnt[] is in intrpvar.h */
93a8090d
NIS		 2223
2224void
2225PerlIO_init(pTHX)
2226{
2227 /* Place holder for stdstreams call ??? */
168d5872 2228#ifdef USE_THREADS
27da23d5 2229 MUTEX_INIT(&PerlIO_mutex);
93a8090d
NIS		 2230#endif
2231}
2232
168d5872
NIS		 2233void
2234PerlIOUnix_refcnt_inc(int fd)
2235{
27da23d5 2236 dTHX;
168d5872
NIS		 2237 if (fd >= 0 && fd < PERLIO_MAX_REFCOUNTABLE_FD) {
2238#ifdef USE_THREADS
2239 MUTEX_LOCK(&PerlIO_mutex);
2240#endif
27da23d5
JH		 2241 PL_perlio_fd_refcnt[fd]++;
2242 PerlIO_debug("fd %d refcnt=%d\n",fd,PL_perlio_fd_refcnt[fd]);
168d5872
NIS		 2243#ifdef USE_THREADS
2244 MUTEX_UNLOCK(&PerlIO_mutex);
2245#endif
2246 }
2247}
2248
168d5872
NIS		 2249int
2250PerlIOUnix_refcnt_dec(int fd)
2251{
27da23d5 2252 dTHX;
168d5872
NIS		 2253 int cnt = 0;
2254 if (fd >= 0 && fd < PERLIO_MAX_REFCOUNTABLE_FD) {
2255#ifdef USE_THREADS
2256 MUTEX_LOCK(&PerlIO_mutex);
2257#endif
27da23d5 2258 cnt = --PL_perlio_fd_refcnt[fd];
168d5872
NIS		 2259 PerlIO_debug("fd %d refcnt=%d\n",fd,cnt);
2260#ifdef USE_THREADS
2261 MUTEX_UNLOCK(&PerlIO_mutex);
2262#endif
2263 }
2264 return cnt;
2265}
2266
694c95cf
JH		 2267void
2268PerlIO_cleanup(pTHX)
2269{
2270 int i;
2271#ifdef USE_ITHREADS
9f4bd222
NIS		 2272 PerlIO_debug("Cleanup layers for %p\n",aTHX);
2273#else
2274 PerlIO_debug("Cleanup layers\n");
694c95cf
JH		 2275#endif
2276 /* Raise STDIN..STDERR refcount so we don't close them */
2277 for (i=0; i < 3; i++)
2278 PerlIOUnix_refcnt_inc(i);
2279 PerlIO_cleantable(aTHX_ &PL_perlio);
2280 /* Restore STDIN..STDERR refcount */
2281 for (i=0; i < 3; i++)
2282 PerlIOUnix_refcnt_dec(i);
9f4bd222
NIS		 2283
2284 if (PL_known_layers) {
2285 PerlIO_list_free(aTHX_ PL_known_layers);
2286 PL_known_layers = NULL;
2287 }
27da23d5 2288 if (PL_def_layerlist) {
9f4bd222
NIS		 2289 PerlIO_list_free(aTHX_ PL_def_layerlist);
2290 PL_def_layerlist = NULL;
2291 }
694c95cf
JH		 2292}
2293
2294
2295
9e353e3b 2296/*--------------------------------------------------------------------------------------*/
14a5cf38 2297/*
71200d45 2298 * Bottom-most level for UNIX-like case
14a5cf38 2299 */
9e353e3b 2300
14a5cf38 2301typedef struct {
22569500
NIS		 2302 struct _PerlIO base; /* The generic part */
2303 int fd; /* UNIX like file descriptor */
2304 int oflags; /* open/fcntl flags */
9e353e3b
NIS		 2305} PerlIOUnix;
2306
6f9d8c32 2307int
9e353e3b 2308PerlIOUnix_oflags(const char *mode)
760ac839 2309{
14a5cf38 2310 int oflags = -1;
3b6c1aba 2311 if (*mode == IoTYPE_IMPLICIT || *mode == IoTYPE_NUMERIC)
14a5cf38
JH		 2312 mode++;
2313 switch (*mode) {
2314 case 'r':
2315 oflags = O_RDONLY;
2316 if (*++mode == '+') {
2317 oflags = O_RDWR;
2318 mode++;
2319 }
2320 break;
2321
2322 case 'w':
2323 oflags = O_CREAT | O_TRUNC;
2324 if (*++mode == '+') {
2325 oflags |= O_RDWR;
2326 mode++;
2327 }
2328 else
2329 oflags |= O_WRONLY;
2330 break;
2331
2332 case 'a':
2333 oflags = O_CREAT | O_APPEND;
2334 if (*++mode == '+') {
2335 oflags |= O_RDWR;
2336 mode++;
2337 }
2338 else
2339 oflags |= O_WRONLY;
2340 break;
2341 }
2342 if (*mode == 'b') {
2343 oflags |= O_BINARY;
2344 oflags &= ~O_TEXT;
2345 mode++;
2346 }
2347 else if (*mode == 't') {
2348 oflags |= O_TEXT;
2349 oflags &= ~O_BINARY;
2350 mode++;
2351 }
2352 /*
71200d45 2353 * Always open in binary mode
14a5cf38
JH		 2354 */
2355 oflags |= O_BINARY;
2356 if (*mode || oflags == -1) {
93189314 2357 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH		 2358 oflags = -1;
2359 }
2360 return oflags;
9e353e3b
NIS		 2361}
2362
2363IV
f62ce20a 2364PerlIOUnix_fileno(pTHX_ PerlIO *f)
9e353e3b 2365{
14a5cf38 2366 return PerlIOSelf(f, PerlIOUnix)->fd;
9e353e3b
NIS		 2367}
2368
aa063c35
NIS		 2369static void
2370PerlIOUnix_setfd(pTHX_ PerlIO *f, int fd, int imode)
4b803d04 2371{
de009b76 2372 PerlIOUnix * const s = PerlIOSelf(f, PerlIOUnix);
6caa5a9c 2373#if defined(WIN32)
aa063c35
NIS		 2374 Stat_t st;
2375 if (PerlLIO_fstat(fd, &st) == 0) {
6caa5a9c 2376 if (!S_ISREG(st.st_mode)) {
aa063c35 2377 PerlIO_debug("%d is not regular file\n",fd);
6caa5a9c
NIS		 2378 PerlIOBase(f)->flags |= PERLIO_F_NOTREG;
2379 }
aa063c35
NIS		 2380 else {
2381 PerlIO_debug("%d _is_ a regular file\n",fd);
2382 }
6caa5a9c
NIS		 2383 }
2384#endif
aa063c35
NIS		 2385 s->fd = fd;
2386 s->oflags = imode;
2387 PerlIOUnix_refcnt_inc(fd);
2388}
2389
2390IV
2391PerlIOUnix_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
2392{
2393 IV code = PerlIOBase_pushed(aTHX_ f, mode, arg, tab);
14a5cf38 2394 if (*PerlIONext(f)) {
4b069b44 2395 /* We never call down so do any pending stuff now */
03c0554d 2396 PerlIO_flush(PerlIONext(f));
14a5cf38 2397 /*
71200d45 2398 * XXX could (or should) we retrieve the oflags from the open file
14a5cf38 2399 * handle rather than believing the "mode" we are passed in? XXX
71200d45 2400 * Should the value on NULL mode be 0 or -1?
14a5cf38 2401 */
acbd16bf 2402 PerlIOUnix_setfd(aTHX_ f, PerlIO_fileno(PerlIONext(f)),
aa063c35 2403 mode ? PerlIOUnix_oflags(mode) : -1);
14a5cf38
JH		 2404 }
2405 PerlIOBase(f)->flags |= PERLIO_F_OPEN;
6caa5a9c 2406
14a5cf38 2407 return code;
4b803d04
NIS		 2408}
2409
c2fcde81
JH		 2410IV
2411PerlIOUnix_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
2412{
de009b76 2413 const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
0723351e 2414 Off_t new_loc;
c2fcde81
JH		 2415 if (PerlIOBase(f)->flags & PERLIO_F_NOTREG) {
2416#ifdef ESPIPE
2417 SETERRNO(ESPIPE, LIB_INVARG);
2418#else
2419 SETERRNO(EINVAL, LIB_INVARG);
2420#endif
2421 return -1;
2422 }
0723351e
NC		 2423 new_loc = PerlLIO_lseek(fd, offset, whence);
2424 if (new_loc == (Off_t) - 1)
c2fcde81
JH		 2425 {
2426 return -1;
2427 }
2428 PerlIOBase(f)->flags &= ~PERLIO_F_EOF;
2429 return 0;
2430}
2431
9e353e3b 2432PerlIO *
14a5cf38
JH		 2433PerlIOUnix_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers,
2434 IV n, const char *mode, int fd, int imode,
2435 int perm, PerlIO *f, int narg, SV **args)
2436{
d9dac8cd 2437 if (PerlIOValid(f)) {
14a5cf38 2438 if (PerlIOBase(f)->flags & PERLIO_F_OPEN)
f62ce20a 2439 (*PerlIOBase(f)->tab->Close)(aTHX_ f);
14a5cf38
JH		 2440 }
2441 if (narg > 0) {
3b6c1aba 2442 if (*mode == IoTYPE_NUMERIC)
14a5cf38
JH		 2443 mode++;
2444 else {
2445 imode = PerlIOUnix_oflags(mode);
2446 perm = 0666;
2447 }
2448 if (imode != -1) {
e62f0680 2449 const char *path = SvPV_nolen_const(*args);
14a5cf38
JH		 2450 fd = PerlLIO_open3(path, imode, perm);
2451 }
2452 }
2453 if (fd >= 0) {
3b6c1aba 2454 if (*mode == IoTYPE_IMPLICIT)
14a5cf38
JH		 2455 mode++;
2456 if (!f) {
2457 f = PerlIO_allocate(aTHX);
d9dac8cd
NIS		 2458 }
2459 if (!PerlIOValid(f)) {
a33cf58c
NIS		 2460 if (!(f = PerlIO_push(aTHX_ f, self, mode, PerlIOArg))) {
2461 return NULL;
2462 }
d9dac8cd 2463 }
aa063c35 2464 PerlIOUnix_setfd(aTHX_ f, fd, imode);
14a5cf38 2465 PerlIOBase(f)->flags |= PERLIO_F_OPEN;
c2fcde81
JH		 2466 if (*mode == IoTYPE_APPEND)
2467 PerlIOUnix_seek(aTHX_ f, 0, SEEK_END);
14a5cf38
JH		 2468 return f;
2469 }
2470 else {
2471 if (f) {
2472 /*
71200d45 2473 * FIXME: pop layers ???
14a5cf38
JH		 2474 */
2475 }
2476 return NULL;
2477 }
9e353e3b
NIS		 2478}
2479
71200d45 2480PerlIO *
ecdeb87c 2481PerlIOUnix_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
71200d45
NIS		 2482{
2483 PerlIOUnix *os = PerlIOSelf(o, PerlIOUnix);
93a8090d 2484 int fd = os->fd;
ecdeb87c
NIS		 2485 if (flags & PERLIO_DUP_FD) {
2486 fd = PerlLIO_dup(fd);
2487 }
93a8090d 2488 if (fd >= 0 && fd < PERLIO_MAX_REFCOUNTABLE_FD) {
ecdeb87c 2489 f = PerlIOBase_dup(aTHX_ f, o, param, flags);
71200d45
NIS		 2490 if (f) {
2491 /* If all went well overwrite fd in dup'ed lay with the dup()'ed fd */
aa063c35 2492 PerlIOUnix_setfd(aTHX_ f, fd, os->oflags);
71200d45
NIS		 2493 return f;
2494 }
71200d45
NIS		 2495 }
2496 return NULL;
2497}
2498
2499
9e353e3b 2500SSize_t
f62ce20a 2501PerlIOUnix_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
9e353e3b 2502{
de009b76 2503 const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
27da23d5
JH		 2504#ifdef PERLIO_STD_SPECIAL
2505 if (fd == 0)
2506 return PERLIO_STD_IN(fd, vbuf, count);
2507#endif
81428673 2508 if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD) ||
1fd8f4ce 2509 PerlIOBase(f)->flags & (PERLIO_F_EOF|PERLIO_F_ERROR)) {
263df5f1 2510 return 0;
1fd8f4ce 2511 }
14a5cf38 2512 while (1) {
b464bac0 2513 const SSize_t len = PerlLIO_read(fd, vbuf, count);
14a5cf38 2514 if (len >= 0 || errno != EINTR) {
ba85f2ea
NIS		 2515 if (len < 0) {
2516 if (errno != EAGAIN) {
2517 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
2518 }
2519 }
2520 else if (len == 0 && count != 0) {
14a5cf38 2521 PerlIOBase(f)->flags |= PERLIO_F_EOF;
ba85f2ea
NIS		 2522 SETERRNO(0,0);
2523 }
14a5cf38
JH		 2524 return len;
2525 }
2526 PERL_ASYNC_CHECK();
2527 }
b464bac0 2528 /*NOTREACHED*/
9e353e3b
NIS		 2529}
2530
2531SSize_t
f62ce20a 2532PerlIOUnix_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 2533{
de009b76 2534 const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
27da23d5
JH		 2535#ifdef PERLIO_STD_SPECIAL
2536 if (fd == 1 || fd == 2)
2537 return PERLIO_STD_OUT(fd, vbuf, count);
2538#endif
14a5cf38 2539 while (1) {
de009b76 2540 const SSize_t len = PerlLIO_write(fd, vbuf, count);
14a5cf38 2541 if (len >= 0 || errno != EINTR) {
ba85f2ea
NIS		 2542 if (len < 0) {
2543 if (errno != EAGAIN) {
2544 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
2545 }
2546 }
14a5cf38
JH		 2547 return len;
2548 }
2549 PERL_ASYNC_CHECK();
06da4f11 2550 }
1b6737cc 2551 /*NOTREACHED*/
9e353e3b
NIS		 2552}
2553
9e353e3b 2554Off_t
f62ce20a 2555PerlIOUnix_tell(pTHX_ PerlIO *f)
9e353e3b 2556{
14a5cf38 2557 return PerlLIO_lseek(PerlIOSelf(f, PerlIOUnix)->fd, 0, SEEK_CUR);
9e353e3b
NIS		 2558}
2559
71200d45 2560
9e353e3b 2561IV
f62ce20a 2562PerlIOUnix_close(pTHX_ PerlIO *f)
9e353e3b 2563{
de009b76 2564 const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
14a5cf38 2565 int code = 0;
168d5872
NIS		 2566 if (PerlIOBase(f)->flags & PERLIO_F_OPEN) {
2567 if (PerlIOUnix_refcnt_dec(fd) > 0) {
93a8090d
NIS		 2568 PerlIOBase(f)->flags &= ~PERLIO_F_OPEN;
2569 return 0;
22569500 2570 }
93a8090d
NIS		 2571 }
2572 else {
93189314 2573 SETERRNO(EBADF,SS_IVCHAN);
93a8090d
NIS		 2574 return -1;
2575 }
14a5cf38
JH		 2576 while (PerlLIO_close(fd) != 0) {
2577 if (errno != EINTR) {
2578 code = -1;
2579 break;
2580 }
2581 PERL_ASYNC_CHECK();
2582 }
2583 if (code == 0) {
2584 PerlIOBase(f)->flags &= ~PERLIO_F_OPEN;
2585 }
2586 return code;
9e353e3b
NIS		 2587}
2588
27da23d5 2589PERLIO_FUNCS_DECL(PerlIO_unix) = {
2dc2558e 2590 sizeof(PerlIO_funcs),
14a5cf38
JH		 2591 "unix",
2592 sizeof(PerlIOUnix),
2593 PERLIO_K_RAW,
2594 PerlIOUnix_pushed,
44798d05 2595 PerlIOBase_popped,
14a5cf38 2596 PerlIOUnix_open,
86e05cf2 2597 PerlIOBase_binmode, /* binmode */
14a5cf38
JH		 2598 NULL,
2599 PerlIOUnix_fileno,
71200d45 2600 PerlIOUnix_dup,
14a5cf38
JH		 2601 PerlIOUnix_read,
2602 PerlIOBase_unread,
2603 PerlIOUnix_write,
2604 PerlIOUnix_seek,
2605 PerlIOUnix_tell,
2606 PerlIOUnix_close,
22569500
NIS		 2607 PerlIOBase_noop_ok, /* flush */
2608 PerlIOBase_noop_fail, /* fill */
14a5cf38
JH		 2609 PerlIOBase_eof,
2610 PerlIOBase_error,
2611 PerlIOBase_clearerr,
2612 PerlIOBase_setlinebuf,
22569500
NIS		 2613 NULL, /* get_base */
2614 NULL, /* get_bufsiz */
2615 NULL, /* get_ptr */
2616 NULL, /* get_cnt */
2617 NULL, /* set_ptrcnt */
9e353e3b
NIS		 2618};
2619
2620/*--------------------------------------------------------------------------------------*/
14a5cf38 2621/*
71200d45 2622 * stdio as a layer
14a5cf38 2623 */
9e353e3b 2624
313e59c8
NIS		 2625#if defined(VMS) && !defined(STDIO_BUFFER_WRITABLE)
2626/* perl5.8 - This ensures the last minute VMS ungetc fix is not
2627 broken by the last second glibc 2.3 fix
2628 */
2629#define STDIO_BUFFER_WRITABLE
2630#endif
2631
2632
14a5cf38
JH		 2633typedef struct {
2634 struct _PerlIO base;
22569500 2635 FILE *stdio; /* The stream */
9e353e3b
NIS		 2636} PerlIOStdio;
2637
2638IV
f62ce20a 2639PerlIOStdio_fileno(pTHX_ PerlIO *f)
9e353e3b 2640{
439ba545 2641 FILE *s;
81428673 2642 if (PerlIOValid(f) && (s = PerlIOSelf(f, PerlIOStdio)->stdio)) {
439ba545
NIS		 2643 return PerlSIO_fileno(s);
2644 }
2645 errno = EBADF;
2646 return -1;
9e353e3b
NIS		 2647}
2648
766a733e 2649char *
14a5cf38
JH		 2650PerlIOStdio_mode(const char *mode, char *tmode)
2651{
de009b76 2652 char * const ret = tmode;
a0625d38
SR		 2653 if (mode) {
2654 while (*mode) {
2655 *tmode++ = *mode++;
2656 }
14a5cf38 2657 }
95005ad8 2658#if defined(PERLIO_USING_CRLF) || defined(__CYGWIN__)
6ce75a77
JH		 2659 *tmode++ = 'b';
2660#endif
14a5cf38
JH		 2661 *tmode = '\0';
2662 return ret;
2663}
2664
4b803d04 2665IV
2dc2558e 2666PerlIOStdio_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
4b803d04 2667{
1fd8f4ce
NIS		 2668 PerlIO *n;
2669 if (PerlIOValid(f) && PerlIOValid(n = PerlIONext(f))) {
2670 PerlIO_funcs *toptab = PerlIOBase(n)->tab;
2671 if (toptab == tab) {
2672 /* Top is already stdio - pop self (duplicate) and use original */
2673 PerlIO_pop(aTHX_ f);
2674 return 0;
2675 } else {
de009b76 2676 const int fd = PerlIO_fileno(n);
1fd8f4ce
NIS		 2677 char tmode[8];
2678 FILE *stdio;
81428673 2679 if (fd >= 0 && (stdio = PerlSIO_fdopen(fd,
1fd8f4ce
NIS		 2680 mode = PerlIOStdio_mode(mode, tmode)))) {
2681 PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
2682 /* We never call down so do any pending stuff now */
2683 PerlIO_flush(PerlIONext(f));
81428673 2684 }
1fd8f4ce
NIS		 2685 else {
2686 return -1;
2687 }
2688 }
14a5cf38 2689 }
2dc2558e 2690 return PerlIOBase_pushed(aTHX_ f, mode, arg, tab);
4b803d04
NIS		 2691}
2692
22569500 2693
9e353e3b 2694PerlIO *
4b069b44 2695PerlIO_importFILE(FILE *stdio, const char *mode)
9e353e3b 2696{
14a5cf38
JH		 2697 dTHX;
2698 PerlIO *f = NULL;
2699 if (stdio) {
22569500 2700 PerlIOStdio *s;
4b069b44
NIS		 2701 if (!mode || !*mode) {
2702 /* We need to probe to see how we can open the stream
2703 so start with read/write and then try write and read
2704 we dup() so that we can fclose without loosing the fd.
2705
2706 Note that the errno value set by a failing fdopen
2707 varies between stdio implementations.
2708 */
de009b76 2709 const int fd = PerlLIO_dup(fileno(stdio));
a33cf58c 2710 FILE *f2 = PerlSIO_fdopen(fd, (mode = "r+"));
4b069b44 2711 if (!f2) {
a33cf58c 2712 f2 = PerlSIO_fdopen(fd, (mode = "w"));
4b069b44
NIS		 2713 }
2714 if (!f2) {
a33cf58c 2715 f2 = PerlSIO_fdopen(fd, (mode = "r"));
4b069b44
NIS		 2716 }
2717 if (!f2) {
2718 /* Don't seem to be able to open */
2719 PerlLIO_close(fd);
2720 return f;
2721 }
2722 fclose(f2);
22569500 2723 }
27da23d5 2724 if ((f = PerlIO_push(aTHX_(f = PerlIO_allocate(aTHX)), PERLIO_FUNCS_CAST(&PerlIO_stdio), mode, Nullsv))) {
a33cf58c
NIS		 2725 s = PerlIOSelf(f, PerlIOStdio);
2726 s->stdio = stdio;
2727 }
14a5cf38
JH		 2728 }
2729 return f;
9e353e3b
NIS		 2730}
2731
2732PerlIO *
14a5cf38
JH		 2733PerlIOStdio_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers,
2734 IV n, const char *mode, int fd, int imode,
2735 int perm, PerlIO *f, int narg, SV **args)
2736{
2737 char tmode[8];
d9dac8cd 2738 if (PerlIOValid(f)) {
e62f0680 2739 const char *path = SvPV_nolen_const(*args);
14a5cf38 2740 PerlIOStdio *s = PerlIOSelf(f, PerlIOStdio);
1751d015
NIS		 2741 FILE *stdio;
2742 PerlIOUnix_refcnt_dec(fileno(s->stdio));
2743 stdio = PerlSIO_freopen(path, (mode = PerlIOStdio_mode(mode, tmode)),
14a5cf38
JH		 2744 s->stdio);
2745 if (!s->stdio)
2746 return NULL;
2747 s->stdio = stdio;
1751d015 2748 PerlIOUnix_refcnt_inc(fileno(s->stdio));
14a5cf38
JH		 2749 return f;
2750 }
2751 else {
2752 if (narg > 0) {
e62f0680 2753 const char *path = SvPV_nolen_const(*args);
3b6c1aba 2754 if (*mode == IoTYPE_NUMERIC) {
14a5cf38
JH		 2755 mode++;
2756 fd = PerlLIO_open3(path, imode, perm);
2757 }
2758 else {
95005ad8
GH		 2759 FILE *stdio;
2760 bool appended = FALSE;
2761#ifdef __CYGWIN__
2762 /* Cygwin wants its 'b' early. */
2763 appended = TRUE;
2764 mode = PerlIOStdio_mode(mode, tmode);
2765#endif
2766 stdio = PerlSIO_fopen(path, mode);
6f0313ac
JH		 2767 if (stdio) {
2768 PerlIOStdio *s;
2769 if (!f) {
2770 f = PerlIO_allocate(aTHX);
2771 }
95005ad8
GH		 2772 if (!appended)
2773 mode = PerlIOStdio_mode(mode, tmode);
2774 f = PerlIO_push(aTHX_ f, self, mode, PerlIOArg);
2775 if (f) {
6f0313ac
JH		 2776 s = PerlIOSelf(f, PerlIOStdio);
2777 s->stdio = stdio;
2778 PerlIOUnix_refcnt_inc(fileno(s->stdio));
2779 }
2780 return f;
2781 }
2782 else {
2783 return NULL;
2784 }
14a5cf38
JH		 2785 }
2786 }
2787 if (fd >= 0) {
2788 FILE *stdio = NULL;
2789 int init = 0;
3b6c1aba 2790 if (*mode == IoTYPE_IMPLICIT) {
14a5cf38
JH		 2791 init = 1;
2792 mode++;
2793 }
2794 if (init) {
2795 switch (fd) {
2796 case 0:
2797 stdio = PerlSIO_stdin;
2798 break;
2799 case 1:
2800 stdio = PerlSIO_stdout;
2801 break;
2802 case 2:
2803 stdio = PerlSIO_stderr;
2804 break;
2805 }
2806 }
2807 else {
2808 stdio = PerlSIO_fdopen(fd, mode =
2809 PerlIOStdio_mode(mode, tmode));
2810 }
2811 if (stdio) {
d9dac8cd
NIS		 2812 if (!f) {
2813 f = PerlIO_allocate(aTHX);
2814 }
a33cf58c 2815 if ((f = PerlIO_push(aTHX_ f, self, mode, PerlIOArg))) {
de009b76 2816 PerlIOStdio *s = PerlIOSelf(f, PerlIOStdio);
a33cf58c
NIS		 2817 s->stdio = stdio;
2818 PerlIOUnix_refcnt_inc(fileno(s->stdio));
2819 }
14a5cf38
JH		 2820 return f;
2821 }
2822 }
2823 }
ee518936 2824 return NULL;
9e353e3b
NIS		 2825}
2826
1751d015 2827PerlIO *
ecdeb87c 2828PerlIOStdio_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
1751d015
NIS		 2829{
2830 /* This assumes no layers underneath - which is what
2831 happens, but is not how I remember it. NI-S 2001/10/16
2832 */
ecdeb87c 2833 if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) {
694c95cf 2834 FILE *stdio = PerlIOSelf(o, PerlIOStdio)->stdio;
de009b76 2835 const int fd = fileno(stdio);
9217ff3f 2836 char mode[8];
ecdeb87c 2837 if (flags & PERLIO_DUP_FD) {
de009b76 2838 const int dfd = PerlLIO_dup(fileno(stdio));
9217ff3f
NIS		 2839 if (dfd >= 0) {
2840 stdio = PerlSIO_fdopen(dfd, PerlIO_modestr(o,mode));
2841 goto set_this;
ecdeb87c
NIS		 2842 }
2843 else {
2844 /* FIXME: To avoid messy error recovery if dup fails
2845 re-use the existing stdio as though flag was not set
2846 */
2847 }
2848 }
9217ff3f
NIS		 2849 stdio = PerlSIO_fdopen(fd, PerlIO_modestr(o,mode));
2850 set_this:
694c95cf
JH		 2851 PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
2852 PerlIOUnix_refcnt_inc(fileno(stdio));
1751d015
NIS		 2853 }
2854 return f;
2855}
2856
0d7a5398
NIS		 2857static int
2858PerlIOStdio_invalidate_fileno(pTHX_ FILE *f)
2859{
2860 /* XXX this could use PerlIO_canset_fileno() and
37725cdc 2861 * PerlIO_set_fileno() support from Configure
0d7a5398 2862 */
ef8eacb8
AT		 2863# if defined(__UCLIBC__)
2864 /* uClibc must come before glibc because it defines __GLIBC__ as well. */
2865 f->__filedes = -1;
2866 return 1;
2867# elif defined(__GLIBC__)
0d7a5398 2868 /* There may be a better way for GLIBC:
37725cdc 2869 - libio.h defines a flag to not close() on cleanup
0d7a5398
NIS		 2870 */
2871 f->_fileno = -1;
2872 return 1;
2873# elif defined(__sun__)
2874# if defined(_LP64)
2875 /* On solaris, if _LP64 is defined, the FILE structure is this:
2876 *
2877 * struct FILE {
2878 * long __pad[16];
2879 * };
2880 *
37725cdc 2881 * It turns out that the fd is stored in the top 32 bits of
0d7a5398
NIS		 2882 * file->__pad[4]. The lower 32 bits contain flags. file->pad[5] appears
2883 * to contain a pointer or offset into another structure. All the
2884 * remaining fields are zero.
2885 *
2886 * We set the top bits to -1 (0xFFFFFFFF).
2887 */
2888 f->__pad[4] |= 0xffffffff00000000L;
2889 assert(fileno(f) == 0xffffffff);
2890# else /* !defined(_LP64) */
37725cdc
NIS		 2891 /* _file is just a unsigned char :-(
2892 Not clear why we dup() rather than using -1
2893 even if that would be treated as 0xFF - so will
0d7a5398
NIS		 2894 a dup fail ...
2895 */
673c27c1 2896 f->_file = PerlLIO_dup(fileno(f));
0d7a5398
NIS		 2897# endif /* defined(_LP64) */
2898 return 1;
2899# elif defined(__hpux)
2900 f->__fileH = 0xff;
2901 f->__fileL = 0xff;
2902 return 1;
9837d373 2903 /* Next one ->_file seems to be a reasonable fallback, i.e. if
37725cdc 2904 your platform does not have special entry try this one.
9837d373
NIS		 2905 [For OSF only have confirmation for Tru64 (alpha)
2906 but assume other OSFs will be similar.]
37725cdc 2907 */
9837d373 2908# elif defined(_AIX) || defined(__osf__) || defined(__irix__)
0d7a5398
NIS		 2909 f->_file = -1;
2910 return 1;
2911# elif defined(__FreeBSD__)
2912 /* There may be a better way on FreeBSD:
37725cdc
NIS		 2913 - we could insert a dummy func in the _close function entry
2914 f->_close = (int (*)(void *)) dummy_close;
0d7a5398
NIS		 2915 */
2916 f->_file = -1;
0c49ea6a
SU		 2917 return 1;
2918# elif defined(__OpenBSD__)
2919 /* There may be a better way on OpenBSD:
2920 - we could insert a dummy func in the _close function entry
2921 f->_close = (int (*)(void *)) dummy_close;
2922 */
2923 f->_file = -1;
0d7a5398 2924 return 1;
59ad941d
IZ		 2925# elif defined(__EMX__)
2926 /* f->_flags &= ~_IOOPEN; */ /* Will leak stream->_buffer */
2927 f->_handle = -1;
2928 return 1;
0d7a5398
NIS		 2929# elif defined(__CYGWIN__)
2930 /* There may be a better way on CYGWIN:
37725cdc
NIS		 2931 - we could insert a dummy func in the _close function entry
2932 f->_close = (int (*)(void *)) dummy_close;
0d7a5398
NIS		 2933 */
2934 f->_file = -1;
2935 return 1;
2936# elif defined(WIN32)
2937# if defined(__BORLANDC__)
2938 f->fd = PerlLIO_dup(fileno(f));
b475b3e6
JH		 2939# elif defined(UNDER_CE)
2940 /* WIN_CE does not have access to FILE internals, it hardly has FILE
2941 structure at all
2942 */
0d7a5398
NIS		 2943# else
2944 f->_file = -1;
2945# endif
2946 return 1;
2947# else
2948#if 0
37725cdc 2949 /* Sarathy's code did this - we fall back to a dup/dup2 hack
0d7a5398 2950 (which isn't thread safe) instead
37725cdc 2951 */
0d7a5398
NIS		 2952# error "Don't know how to set FILE.fileno on your platform"
2953#endif
8772537c 2954 PERL_UNUSED_ARG(f);
0d7a5398
NIS		 2955 return 0;
2956# endif
2957}
2958
1751d015 2959IV
f62ce20a 2960PerlIOStdio_close(pTHX_ PerlIO *f)
1751d015 2961{
1751d015 2962 FILE *stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
439ba545
NIS		 2963 if (!stdio) {
2964 errno = EBADF;
2965 return -1;
2966 }
9217ff3f 2967 else {
de009b76 2968 const int fd = fileno(stdio);
0d7a5398
NIS		 2969 int socksfd = 0;
2970 int invalidate = 0;
bbfd922f 2971 IV result = 0;
0d7a5398
NIS		 2972 int saveerr = 0;
2973 int dupfd = 0;
2974#ifdef SOCKS5_VERSION_NAME
37725cdc
NIS		 2975 /* Socks lib overrides close() but stdio isn't linked to
2976 that library (though we are) - so we must call close()
2977 on sockets on stdio's behalf.
2978 */
0d7a5398
NIS		 2979 int optval;
2980 Sock_size_t optlen = sizeof(int);
2981 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *) &optval, &optlen) == 0) {
2982 socksfd = 1;
37725cdc 2983 invalidate = 1;
0d7a5398
NIS		 2984 }
2985#endif
9217ff3f
NIS		 2986 if (PerlIOUnix_refcnt_dec(fd) > 0) {
2987 /* File descriptor still in use */
0d7a5398
NIS		 2988 invalidate = 1;
2989 socksfd = 0;
37725cdc 2990 }
0d7a5398 2991 if (invalidate) {
37725cdc
NIS		 2992 /* For STD* handles don't close the stdio at all
2993 this is because we have shared the FILE * too
0d7a5398
NIS		 2994 */
2995 if (stdio == stdin) {
2996 /* Some stdios are buggy fflush-ing inputs */
2997 return 0;
2998 }
2999 else if (stdio == stdout || stdio == stderr) {
9217ff3f
NIS		 3000 return PerlIO_flush(f);
3001 }
37725cdc
NIS		 3002 /* Tricky - must fclose(stdio) to free memory but not close(fd)
3003 Use Sarathy's trick from maint-5.6 to invalidate the
3004 fileno slot of the FILE *
3005 */
bbfd922f 3006 result = PerlIO_flush(f);
0d7a5398
NIS		 3007 saveerr = errno;
3008 if (!(invalidate = PerlIOStdio_invalidate_fileno(aTHX_ stdio))) {
9217ff3f
NIS		 3009 dupfd = PerlLIO_dup(fd);
3010 }
37725cdc 3011 }
0d7a5398 3012 result = PerlSIO_fclose(stdio);
37725cdc
NIS		 3013 /* We treat error from stdio as success if we invalidated
3014 errno may NOT be expected EBADF
e8529473
NIS		 3015 */
3016 if (invalidate && result != 0) {
0d7a5398
NIS		 3017 errno = saveerr;
3018 result = 0;
37725cdc 3019 }
0d7a5398
NIS		 3020 if (socksfd) {
3021 /* in SOCKS case let close() determine return value */
3022 result = close(fd);
3023 }
3024 if (dupfd) {
3025 PerlLIO_dup2(dupfd,fd);
8a521f28 3026 PerlLIO_close(dupfd);
9217ff3f
NIS		 3027 }
3028 return result;
37725cdc 3029 }
1751d015
NIS		 3030}
3031
9e353e3b 3032SSize_t
f62ce20a 3033PerlIOStdio_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
9e353e3b 3034{
14a5cf38
JH		 3035 FILE *s = PerlIOSelf(f, PerlIOStdio)->stdio;
3036 SSize_t got = 0;
4d948241
NIS		 3037 for (;;) {
3038 if (count == 1) {
3039 STDCHAR *buf = (STDCHAR *) vbuf;
3040 /*
3041 * Perl is expecting PerlIO_getc() to fill the buffer Linux's
3042 * stdio does not do that for fread()
3043 */
de009b76 3044 const int ch = PerlSIO_fgetc(s);
4d948241
NIS		 3045 if (ch != EOF) {
3046 *buf = ch;
3047 got = 1;
3048 }
14a5cf38 3049 }
4d948241
NIS		 3050 else
3051 got = PerlSIO_fread(vbuf, 1, count, s);
b1d8b47a
CS		 3052 if (got == 0 && PerlSIO_ferror(s))
3053 got = -1;
42a7a32f 3054 if (got >= 0 || errno != EINTR)
4d948241
NIS		 3055 break;
3056 PERL_ASYNC_CHECK();
42a7a32f 3057 SETERRNO(0,0); /* just in case */
14a5cf38 3058 }
14a5cf38 3059 return got;
9e353e3b
NIS		 3060}
3061
3062SSize_t
f62ce20a 3063PerlIOStdio_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 3064{
14a5cf38 3065 SSize_t unread = 0;
93679785
NIS		 3066 FILE *s = PerlIOSelf(f, PerlIOStdio)->stdio;
3067
313e59c8 3068#ifdef STDIO_BUFFER_WRITABLE
9f7cd136 3069 if (PerlIO_fast_gets(f) && PerlIO_has_base(f)) {
93679785
NIS		 3070 STDCHAR *buf = ((STDCHAR *) vbuf) + count;
3071 STDCHAR *base = PerlIO_get_base(f);
3072 SSize_t cnt = PerlIO_get_cnt(f);
3073 STDCHAR *ptr = PerlIO_get_ptr(f);
3074 SSize_t avail = ptr - base;
3075 if (avail > 0) {
3076 if (avail > count) {
3077 avail = count;
3078 }
3079 ptr -= avail;
3080 Move(buf-avail,ptr,avail,STDCHAR);
3081 count -= avail;
3082 unread += avail;
3083 PerlIO_set_ptrcnt(f,ptr,cnt+avail);
9f7cd136
NIS		 3084 if (PerlSIO_feof(s) && unread >= 0)
3085 PerlSIO_clearerr(s);
3086 }
3087 }
313e59c8
NIS		 3088 else
3089#endif
3090 if (PerlIO_has_cntptr(f)) {
9f7cd136
NIS		 3091 /* We can get pointer to buffer but not its base
3092 Do ungetc() but check chars are ending up in the
3093 buffer
3094 */
3095 STDCHAR *eptr = (STDCHAR*)PerlSIO_get_ptr(s);
3096 STDCHAR *buf = ((STDCHAR *) vbuf) + count;
3097 while (count > 0) {
de009b76 3098 const int ch = *--buf & 0xFF;
9f7cd136
NIS		 3099 if (ungetc(ch,s) != ch) {
3100 /* ungetc did not work */
3101 break;
3102 }
3103 if ((STDCHAR*)PerlSIO_get_ptr(s) != --eptr || ((*eptr & 0xFF) != ch)) {
3104 /* Did not change pointer as expected */
3105 fgetc(s); /* get char back again */
3106 break;
3107 }
3108 /* It worked ! */
3109 count--;
3110 unread++;
93679785
NIS		 3111 }
3112 }
3113
3114 if (count > 0) {
3115 unread += PerlIOBase_unread(aTHX_ f, vbuf, count);
14a5cf38
JH		 3116 }
3117 return unread;
9e353e3b
NIS		 3118}
3119
3120SSize_t
f62ce20a 3121PerlIOStdio_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 3122{
4d948241
NIS		 3123 SSize_t got;
3124 for (;;) {
3125 got = PerlSIO_fwrite(vbuf, 1, count,
3126 PerlIOSelf(f, PerlIOStdio)->stdio);
42a7a32f 3127 if (got >= 0 || errno != EINTR)
4d948241
NIS		 3128 break;
3129 PERL_ASYNC_CHECK();
42a7a32f 3130 SETERRNO(0,0); /* just in case */
4d948241
NIS		 3131 }
3132 return got;
9e353e3b
NIS		 3133}
3134
94a175e1 3135IV
f62ce20a 3136PerlIOStdio_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
9e353e3b 3137{
14a5cf38 3138 FILE *stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
94a175e1 3139 return PerlSIO_fseek(stdio, offset, whence);
9e353e3b
NIS		 3140}
3141
3142Off_t
f62ce20a 3143PerlIOStdio_tell(pTHX_ PerlIO *f)
9e353e3b 3144{
14a5cf38 3145 FILE *stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
94a175e1 3146 return PerlSIO_ftell(stdio);
9e353e3b
NIS		 3147}
3148
3149IV
f62ce20a 3150PerlIOStdio_flush(pTHX_ PerlIO *f)
9e353e3b 3151{
14a5cf38
JH		 3152 FILE *stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
3153 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
3154 return PerlSIO_fflush(stdio);
3155 }
3156 else {
88b61e10 3157#if 0
14a5cf38
JH		 3158 /*
3159 * FIXME: This discards ungetc() and pre-read stuff which is not
71200d45 3160 * right if this is just a "sync" from a layer above Suspect right
14a5cf38 3161 * design is to do _this_ but not have layer above flush this
71200d45 3162 * layer read-to-read
14a5cf38
JH		 3163 */
3164 /*
71200d45 3165 * Not writeable - sync by attempting a seek
14a5cf38
JH		 3166 */
3167 int err = errno;
3168 if (PerlSIO_fseek(stdio, (Off_t) 0, SEEK_CUR) != 0)
3169 errno = err;
88b61e10 3170#endif
14a5cf38
JH		 3171 }
3172 return 0;
9e353e3b
NIS		 3173}
3174
3175IV
f62ce20a 3176PerlIOStdio_eof(pTHX_ PerlIO *f)
9e353e3b 3177{
14a5cf38 3178 return PerlSIO_feof(PerlIOSelf(f, PerlIOStdio)->stdio);
9e353e3b
NIS		 3179}
3180
3181IV
f62ce20a 3182PerlIOStdio_error(pTHX_ PerlIO *f)
9e353e3b 3183{
263df5f1 3184 return PerlSIO_ferror(PerlIOSelf(f, PerlIOStdio)->stdio);
9e353e3b
NIS		 3185}
3186
3187void
f62ce20a 3188PerlIOStdio_clearerr(pTHX_ PerlIO *f)
9e353e3b 3189{
14a5cf38 3190 PerlSIO_clearerr(PerlIOSelf(f, PerlIOStdio)->stdio);
9e353e3b
NIS		 3191}
3192
3193void
f62ce20a 3194PerlIOStdio_setlinebuf(pTHX_ PerlIO *f)
9e353e3b
NIS		 3195{
3196#ifdef HAS_SETLINEBUF
14a5cf38 3197 PerlSIO_setlinebuf(PerlIOSelf(f, PerlIOStdio)->stdio);
9e353e3b 3198#else
14a5cf38 3199 PerlSIO_setvbuf(PerlIOSelf(f, PerlIOStdio)->stdio, Nullch, _IOLBF, 0);
9e353e3b
NIS		 3200#endif
3201}
3202
3203#ifdef FILE_base
3204STDCHAR *
f62ce20a 3205PerlIOStdio_get_base(pTHX_ PerlIO *f)
9e353e3b 3206{
14a5cf38 3207 FILE *stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
cc00df79 3208 return (STDCHAR*)PerlSIO_get_base(stdio);
9e353e3b
NIS		 3209}
3210
3211Size_t
f62ce20a 3212PerlIOStdio_get_bufsiz(pTHX_ PerlIO *f)
9e353e3b 3213{
14a5cf38
JH		 3214 FILE *stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
3215 return PerlSIO_get_bufsiz(stdio);
9e353e3b
NIS		 3216}
3217#endif
3218
3219#ifdef USE_STDIO_PTR
3220STDCHAR *
f62ce20a 3221PerlIOStdio_get_ptr(pTHX_ PerlIO *f)
9e353e3b 3222{
14a5cf38 3223 FILE *stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
cc00df79 3224 return (STDCHAR*)PerlSIO_get_ptr(stdio);
9e353e3b
NIS		 3225}
3226
3227SSize_t
f62ce20a 3228PerlIOStdio_get_cnt(pTHX_ PerlIO *f)
9e353e3b 3229{
14a5cf38
JH		 3230 FILE *stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
3231 return PerlSIO_get_cnt(stdio);
9e353e3b
NIS		 3232}
3233
3234void
f62ce20a 3235PerlIOStdio_set_ptrcnt(pTHX_ PerlIO *f, STDCHAR * ptr, SSize_t cnt)
9e353e3b 3236{
14a5cf38 3237 FILE *stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
14a5cf38 3238 if (ptr != NULL) {
9e353e3b 3239#ifdef STDIO_PTR_LVALUE
22569500 3240 PerlSIO_set_ptr(stdio, (void*)ptr); /* LHS STDCHAR* cast non-portable */
9e353e3b 3241#ifdef STDIO_PTR_LVAL_SETS_CNT
14a5cf38 3242 if (PerlSIO_get_cnt(stdio) != (cnt)) {
14a5cf38
JH		 3243 assert(PerlSIO_get_cnt(stdio) == (cnt));
3244 }
9e353e3b
NIS		 3245#endif
3246#if (!defined(STDIO_PTR_LVAL_NOCHANGE_CNT))
14a5cf38 3247 /*
71200d45 3248 * Setting ptr _does_ change cnt - we are done
14a5cf38
JH		 3249 */
3250 return;
9e353e3b 3251#endif
22569500 3252#else /* STDIO_PTR_LVALUE */
14a5cf38 3253 PerlProc_abort();
22569500 3254#endif /* STDIO_PTR_LVALUE */
14a5cf38
JH		 3255 }
3256 /*
71200d45 3257 * Now (or only) set cnt
14a5cf38 3258 */
9e353e3b 3259#ifdef STDIO_CNT_LVALUE
14a5cf38 3260 PerlSIO_set_cnt(stdio, cnt);
22569500 3261#else /* STDIO_CNT_LVALUE */
9e353e3b 3262#if (defined(STDIO_PTR_LVALUE) && defined(STDIO_PTR_LVAL_SETS_CNT))
14a5cf38
JH		 3263 PerlSIO_set_ptr(stdio,
3264 PerlSIO_get_ptr(stdio) + (PerlSIO_get_cnt(stdio) -
3265 cnt));
22569500 3266#else /* STDIO_PTR_LVAL_SETS_CNT */
14a5cf38 3267 PerlProc_abort();
22569500
NIS		 3268#endif /* STDIO_PTR_LVAL_SETS_CNT */
3269#endif /* STDIO_CNT_LVALUE */
9e353e3b
NIS		 3270}
3271
93679785 3272
9e353e3b
NIS		 3273#endif
3274
93679785
NIS		 3275IV
3276PerlIOStdio_fill(pTHX_ PerlIO *f)
3277{
3278 FILE *stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
3279 int c;
3280 /*
3281 * fflush()ing read-only streams can cause trouble on some stdio-s
3282 */
3283 if ((PerlIOBase(f)->flags & PERLIO_F_CANWRITE)) {
3284 if (PerlSIO_fflush(stdio) != 0)
3285 return EOF;
3286 }
3287 c = PerlSIO_fgetc(stdio);
3288 if (c == EOF)
3289 return EOF;
3290
3291#if (defined(STDIO_PTR_LVALUE) && (defined(STDIO_CNT_LVALUE) || defined(STDIO_PTR_LVAL_SETS_CNT)))
313e59c8
NIS		 3292
3293#ifdef STDIO_BUFFER_WRITABLE
9f7cd136 3294 if (PerlIO_fast_gets(f) && PerlIO_has_base(f)) {
93679785
NIS		 3295 /* Fake ungetc() to the real buffer in case system's ungetc
3296 goes elsewhere
3297 */
3298 STDCHAR *base = (STDCHAR*)PerlSIO_get_base(stdio);
3299 SSize_t cnt = PerlSIO_get_cnt(stdio);
3300 STDCHAR *ptr = (STDCHAR*)PerlSIO_get_ptr(stdio);
3301 if (ptr == base+1) {
3302 *--ptr = (STDCHAR) c;
3303 PerlIOStdio_set_ptrcnt(aTHX_ f,ptr,cnt+1);
3304 if (PerlSIO_feof(stdio))
3305 PerlSIO_clearerr(stdio);
3306 return 0;
3307 }
3308 }
313e59c8
NIS		 3309 else
3310#endif
3311 if (PerlIO_has_cntptr(f)) {
9f7cd136
NIS		 3312 STDCHAR ch = c;
3313 if (PerlIOStdio_unread(aTHX_ f,&ch,1) == 1) {
3314 return 0;
3315 }
3316 }
93679785
NIS		 3317#endif
3318
3319#if defined(VMS)
3320 /* An ungetc()d char is handled separately from the regular
3321 * buffer, so we stuff it in the buffer ourselves.
3322 * Should never get called as should hit code above
3323 */
bad9695d
NIS		 3324 *(--((*stdio)->_ptr)) = (unsigned char) c;
3325 (*stdio)->_cnt++;
93679785
NIS		 3326#else
3327 /* If buffer snoop scheme above fails fall back to
9f7cd136 3328 using ungetc().
93679785
NIS		 3329 */
3330 if (PerlSIO_ungetc(c, stdio) != c)
3331 return EOF;
3332#endif
3333 return 0;
3334}
3335
3336
3337
27da23d5 3338PERLIO_FUNCS_DECL(PerlIO_stdio) = {
2dc2558e 3339 sizeof(PerlIO_funcs),
14a5cf38
JH		 3340 "stdio",
3341 sizeof(PerlIOStdio),
86e05cf2 3342 PERLIO_K_BUFFERED|PERLIO_K_RAW,
1fd8f4ce 3343 PerlIOStdio_pushed,
44798d05 3344 PerlIOBase_popped,
14a5cf38 3345 PerlIOStdio_open,
86e05cf2 3346 PerlIOBase_binmode, /* binmode */
14a5cf38
JH		 3347 NULL,
3348 PerlIOStdio_fileno,
71200d45 3349 PerlIOStdio_dup,
14a5cf38
JH		 3350 PerlIOStdio_read,
3351 PerlIOStdio_unread,
3352 PerlIOStdio_write,
3353 PerlIOStdio_seek,
3354 PerlIOStdio_tell,
3355 PerlIOStdio_close,
3356 PerlIOStdio_flush,
3357 PerlIOStdio_fill,
3358 PerlIOStdio_eof,
3359 PerlIOStdio_error,
3360 PerlIOStdio_clearerr,
3361 PerlIOStdio_setlinebuf,
9e353e3b 3362#ifdef FILE_base
14a5cf38
JH		 3363 PerlIOStdio_get_base,
3364 PerlIOStdio_get_bufsiz,
9e353e3b 3365#else
14a5cf38
JH		 3366 NULL,
3367 NULL,
9e353e3b
NIS		 3368#endif
3369#ifdef USE_STDIO_PTR
14a5cf38
JH		 3370 PerlIOStdio_get_ptr,
3371 PerlIOStdio_get_cnt,
15b61c98 3372# if defined(HAS_FAST_STDIO) && defined(USE_FAST_STDIO)
79ed0f43 3373 PerlIOStdio_set_ptrcnt,
15b61c98
JH		 3374# else
3375 NULL,
3376# endif /* HAS_FAST_STDIO && USE_FAST_STDIO */
3377#else
3378 NULL,
14a5cf38
JH		 3379 NULL,
3380 NULL,
15b61c98 3381#endif /* USE_STDIO_PTR */
9e353e3b
NIS		 3382};
3383
b9d6bf13
JH		 3384/* Note that calls to PerlIO_exportFILE() are reversed using
3385 * PerlIO_releaseFILE(), not importFILE. */
9e353e3b 3386FILE *
81428673 3387PerlIO_exportFILE(PerlIO * f, const char *mode)
9e353e3b 3388{
e87a358a 3389 dTHX;
81428673
NIS		 3390 FILE *stdio = NULL;
3391 if (PerlIOValid(f)) {
3392 char buf[8];
3393 PerlIO_flush(f);
3394 if (!mode || !*mode) {
3395 mode = PerlIO_modestr(f, buf);
3396 }
3397 stdio = PerlSIO_fdopen(PerlIO_fileno(f), mode);
3398 if (stdio) {
3399 PerlIOl *l = *f;
9f75cc58 3400 PerlIO *f2;
81428673
NIS		 3401 /* De-link any lower layers so new :stdio sticks */
3402 *f = NULL;
27da23d5 3403 if ((f2 = PerlIO_push(aTHX_ f, PERLIO_FUNCS_CAST(&PerlIO_stdio), buf, Nullsv))) {
9f75cc58 3404 PerlIOStdio *s = PerlIOSelf((f = f2), PerlIOStdio);
81428673
NIS		 3405 s->stdio = stdio;
3406 /* Link previous lower layers under new one */
3407 *PerlIONext(f) = l;
3408 }
3409 else {
3410 /* restore layers list */
3411 *f = l;
3412 }
a33cf58c 3413 }
14a5cf38
JH		 3414 }
3415 return stdio;
9e353e3b
NIS		 3416}
3417
81428673 3418
9e353e3b
NIS		 3419FILE *
3420PerlIO_findFILE(PerlIO *f)
3421{
14a5cf38
JH		 3422 PerlIOl *l = *f;
3423 while (l) {
3424 if (l->tab == &PerlIO_stdio) {
3425 PerlIOStdio *s = PerlIOSelf(&l, PerlIOStdio);
3426 return s->stdio;
3427 }
3428 l = *PerlIONext(&l);
f7e7eb72 3429 }
4b069b44
NIS		 3430 /* Uses fallback "mode" via PerlIO_modestr() in PerlIO_exportFILE */
3431 return PerlIO_exportFILE(f, Nullch);
9e353e3b
NIS		 3432}
3433
b9d6bf13 3434/* Use this to reverse PerlIO_exportFILE calls. */
9e353e3b
NIS		 3435void
3436PerlIO_releaseFILE(PerlIO *p, FILE *f)
3437{
27da23d5 3438 dVAR;
22569500
NIS		 3439 PerlIOl *l;
3440 while ((l = *p)) {
3441 if (l->tab == &PerlIO_stdio) {
3442 PerlIOStdio *s = PerlIOSelf(&l, PerlIOStdio);
3443 if (s->stdio == f) {
3444 dTHX;
3445 PerlIO_pop(aTHX_ p);
3446 return;
3447 }
3448 }
3449 p = PerlIONext(p);
3450 }
3451 return;
9e353e3b
NIS		 3452}
3453
3454/*--------------------------------------------------------------------------------------*/
14a5cf38 3455/*
71200d45 3456 * perlio buffer layer
14a5cf38 3457 */
9e353e3b 3458
5e2ab84b 3459IV
2dc2558e 3460PerlIOBuf_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
5e2ab84b 3461{
14a5cf38 3462 PerlIOBuf *b = PerlIOSelf(f, PerlIOBuf);
de009b76 3463 const int fd = PerlIO_fileno(f);
14a5cf38
JH		 3464 if (fd >= 0 && PerlLIO_isatty(fd)) {
3465 PerlIOBase(f)->flags |= PERLIO_F_LINEBUF | PERLIO_F_TTY;
3466 }
4b069b44 3467 if (*PerlIONext(f)) {
de009b76 3468 const Off_t posn = PerlIO_tell(PerlIONext(f));
4b069b44
NIS		 3469 if (posn != (Off_t) - 1) {
3470 b->posn = posn;
3471 }
14a5cf38 3472 }
2dc2558e 3473 return PerlIOBase_pushed(aTHX_ f, mode, arg, tab);
5e2ab84b
NIS		 3474}
3475
9e353e3b 3476PerlIO *
14a5cf38
JH		 3477PerlIOBuf_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers,
3478 IV n, const char *mode, int fd, int imode, int perm,
3479 PerlIO *f, int narg, SV **args)
3480{
04892f78 3481 if (PerlIOValid(f)) {
14a5cf38 3482 PerlIO *next = PerlIONext(f);
67363c0d
JH		 3483 PerlIO_funcs *tab =
3484 PerlIO_layer_fetch(aTHX_ layers, n - 1, PerlIOBase(next)->tab);
3485 if (tab && tab->Open)
3486 next =
3487 (*tab->Open)(aTHX_ tab, layers, n - 1, mode, fd, imode, perm,
3488 next, narg, args);
2dc2558e 3489 if (!next || (*PerlIOBase(f)->tab->Pushed) (aTHX_ f, mode, PerlIOArg, self) != 0) {
14a5cf38
JH		 3490 return NULL;
3491 }
3492 }
3493 else {
04892f78 3494 PerlIO_funcs *tab = PerlIO_layer_fetch(aTHX_ layers, n - 1, PerlIO_default_btm());
14a5cf38 3495 int init = 0;
3b6c1aba 3496 if (*mode == IoTYPE_IMPLICIT) {
14a5cf38
JH		 3497 init = 1;
3498 /*
71200d45 3499 * mode++;
14a5cf38
JH		 3500 */
3501 }
67363c0d
JH		 3502 if (tab && tab->Open)
3503 f = (*tab->Open)(aTHX_ tab, layers, n - 1, mode, fd, imode, perm,
3504 f, narg, args);
3505 else
3506 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38 3507 if (f) {
22569500 3508 if (PerlIO_push(aTHX_ f, self, mode, PerlIOArg) == 0) {
b26b1ab5
NC		 3509 /*
3510 * if push fails during open, open fails. close will pop us.
3511 */
3512 PerlIO_close (f);
3513 return NULL;
3514 } else {
3515 fd = PerlIO_fileno(f);
b26b1ab5
NC		 3516 if (init && fd == 2) {
3517 /*
3518 * Initial stderr is unbuffered
3519 */
3520 PerlIOBase(f)->flags |= PERLIO_F_UNBUF;
3521 }
23b84778
IZ		 3522#ifdef PERLIO_USING_CRLF
3523# ifdef PERLIO_IS_BINMODE_FD
3524 if (PERLIO_IS_BINMODE_FD(fd))
5c728af0 3525 PerlIO_binmode(aTHX_ f, '<'/*not used*/, O_BINARY, Nullch);
23b84778
IZ		 3526 else
3527# endif
3528 /*
3529 * do something about failing setmode()? --jhi
3530 */
3531 PerlLIO_setmode(fd, O_BINARY);
3532#endif
14a5cf38
JH		 3533 }
3534 }
ee518936 3535 }
14a5cf38 3536 return f;
9e353e3b
NIS		 3537}
3538
14a5cf38
JH		 3539/*
3540 * This "flush" is akin to sfio's sync in that it handles files in either
71200d45 3541 * read or write state
14a5cf38 3542 */
9e353e3b 3543IV
f62ce20a 3544PerlIOBuf_flush(pTHX_ PerlIO *f)
6f9d8c32 3545{
14a5cf38
JH		 3546 PerlIOBuf *b = PerlIOSelf(f, PerlIOBuf);
3547 int code = 0;
04892f78 3548 PerlIO *n = PerlIONext(f);
14a5cf38
JH		 3549 if (PerlIOBase(f)->flags & PERLIO_F_WRBUF) {
3550 /*
71200d45 3551 * write() the buffer
14a5cf38 3552 */
de009b76
AL		 3553 const STDCHAR *buf = b->buf;
3554 const STDCHAR *p = buf;
14a5cf38
JH		 3555 while (p < b->ptr) {
3556 SSize_t count = PerlIO_write(n, p, b->ptr - p);
3557 if (count > 0) {
3558 p += count;
3559 }
3560 else if (count < 0 || PerlIO_error(n)) {
3561 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
3562 code = -1;
3563 break;
3564 }
3565 }
3566 b->posn += (p - buf);
3567 }
3568 else if (PerlIOBase(f)->flags & PERLIO_F_RDBUF) {
3569 STDCHAR *buf = PerlIO_get_base(f);
3570 /*
71200d45 3571 * Note position change
14a5cf38
JH		 3572 */
3573 b->posn += (b->ptr - buf);
3574 if (b->ptr < b->end) {
4b069b44
NIS		 3575 /* We did not consume all of it - try and seek downstream to
3576 our logical position
14a5cf38 3577 */
4b069b44 3578 if (PerlIOValid(n) && PerlIO_seek(n, b->posn, SEEK_SET) == 0) {
04892f78
NIS		 3579 /* Reload n as some layers may pop themselves on seek */
3580 b->posn = PerlIO_tell(n = PerlIONext(f));
14a5cf38 3581 }
ba5c3fe9 3582 else {
4b069b44
NIS		 3583 /* Seek failed (e.g. pipe or tty). Do NOT clear buffer or pre-read
3584 data is lost for good - so return saying "ok" having undone
3585 the position adjust
3586 */
3587 b->posn -= (b->ptr - buf);
ba5c3fe9
NIS		 3588 return code;
3589 }
14a5cf38
JH		 3590 }
3591 }
3592 b->ptr = b->end = b->buf;
3593 PerlIOBase(f)->flags &= ~(PERLIO_F_RDBUF | PERLIO_F_WRBUF);
04892f78 3594 /* We check for Valid because of dubious decision to make PerlIO_flush(NULL) flush all */
04892f78 3595 if (PerlIOValid(n) && PerlIO_flush(n) != 0)
14a5cf38
JH		 3596 code = -1;
3597 return code;
6f9d8c32
NIS		 3598}
3599
06da4f11 3600IV
f62ce20a 3601PerlIOBuf_fill(pTHX_ PerlIO *f)
06da4f11 3602{
14a5cf38
JH		 3603 PerlIOBuf *b = PerlIOSelf(f, PerlIOBuf);
3604 PerlIO *n = PerlIONext(f);
3605 SSize_t avail;
3606 /*
4b069b44
NIS		 3607 * Down-stream flush is defined not to loose read data so is harmless.
3608 * we would not normally be fill'ing if there was data left in anycase.
14a5cf38
JH		 3609 */
3610 if (PerlIO_flush(f) != 0)
3611 return -1;
3612 if (PerlIOBase(f)->flags & PERLIO_F_TTY)
f62ce20a 3613 PerlIOBase_flush_linebuf(aTHX);
14a5cf38
JH		 3614
3615 if (!b->buf)
22569500 3616 PerlIO_get_base(f); /* allocate via vtable */
14a5cf38
JH		 3617
3618 b->ptr = b->end = b->buf;
4b069b44
NIS		 3619
3620 if (!PerlIOValid(n)) {
3621 PerlIOBase(f)->flags |= PERLIO_F_EOF;
3622 return -1;
3623 }
3624
14a5cf38
JH