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[perl5.git] / perlio.c
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14a5cf38 1/*
acde74e1 2 * perlio.c Copyright (c) 1996-2006, 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
b0f06652
VK		 33# ifndef USE_CROSS_COMPILE
34# include "config.h"
35# else
36# include "xconfig.h"
37# endif
12ae5dfc 38#endif
760ac839 39
6f9d8c32 40#define PERLIO_NOT_STDIO 0
760ac839 41#if !defined(PERLIO_IS_STDIO) && !defined(USE_SFIO)
14a5cf38 42/*
71200d45 43 * #define PerlIO FILE
14a5cf38 44 */
760ac839
LW		 45#endif
46/*
6f9d8c32 47 * This file provides those parts of PerlIO abstraction
88b61e10 48 * which are not #defined in perlio.h.
6f9d8c32 49 * Which these are depends on various Configure #ifdef's
760ac839
LW		 50 */
51
52#include "EXTERN.h"
864dbfa3 53#define PERL_IN_PERLIO_C
760ac839
LW		 54#include "perl.h"
55
32af7c23
CL		 56#ifdef PERL_IMPLICIT_CONTEXT
57#undef dSYS
58#define dSYS dTHX
59#endif
60
0c4f7ff0
NIS		 61#include "XSUB.h"
62
9cffb111
OS		 63#ifdef __Lynx__
64/* Missing proto on LynxOS */
65int mkstemp(char*);
66#endif
67
1b7a0411 68/* Call the callback or PerlIOBase, and return failure. */
b32dd47e 69#define Perl_PerlIO_or_Base(f, callback, base, failure, args) \
1b7a0411 70 if (PerlIOValid(f)) { \
46c461b5 71 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
1b7a0411
JH		 72 if (tab && tab->callback) \
73 return (*tab->callback) args; \
74 else \
75 return PerlIOBase_ ## base args; \
76 } \
77 else \
78 SETERRNO(EBADF, SS_IVCHAN); \
79 return failure
80
81/* Call the callback or fail, and return failure. */
b32dd47e 82#define Perl_PerlIO_or_fail(f, callback, failure, args) \
1b7a0411 83 if (PerlIOValid(f)) { \
46c461b5 84 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
1b7a0411
JH		 85 if (tab && tab->callback) \
86 return (*tab->callback) args; \
87 SETERRNO(EINVAL, LIB_INVARG); \
88 } \
89 else \
90 SETERRNO(EBADF, SS_IVCHAN); \
91 return failure
92
93/* Call the callback or PerlIOBase, and be void. */
b32dd47e 94#define Perl_PerlIO_or_Base_void(f, callback, base, args) \
1b7a0411 95 if (PerlIOValid(f)) { \
46c461b5 96 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
1b7a0411
JH		 97 if (tab && tab->callback) \
98 (*tab->callback) args; \
99 else \
100 PerlIOBase_ ## base args; \
1b7a0411
JH		 101 } \
102 else \
103 SETERRNO(EBADF, SS_IVCHAN)
104
105/* Call the callback or fail, and be void. */
b32dd47e 106#define Perl_PerlIO_or_fail_void(f, callback, args) \
1b7a0411 107 if (PerlIOValid(f)) { \
46c461b5 108 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
1b7a0411
JH		 109 if (tab && tab->callback) \
110 (*tab->callback) args; \
37725cdc
NIS		 111 else \
112 SETERRNO(EINVAL, LIB_INVARG); \
1b7a0411
JH		 113 } \
114 else \
115 SETERRNO(EBADF, SS_IVCHAN)
116
89a3a251
JH		 117#if defined(__osf__) && _XOPEN_SOURCE < 500
118extern int fseeko(FILE *, off_t, int);
119extern off_t ftello(FILE *);
120#endif
121
71ab4674 122#ifndef USE_SFIO
a0c21aa1
JH		 123
124EXTERN_C int perlsio_binmode(FILE *fp, int iotype, int mode);
125
71ab4674
SP		 126int
127perlsio_binmode(FILE *fp, int iotype, int mode)
128{
129 /*
130 * This used to be contents of do_binmode in doio.c
131 */
132#ifdef DOSISH
133# if defined(atarist) || defined(__MINT__)
134 if (!fflush(fp)) {
135 if (mode & O_BINARY)
136 ((FILE *) fp)->_flag |= _IOBIN;
137 else
138 ((FILE *) fp)->_flag &= ~_IOBIN;
139 return 1;
140 }
141 return 0;
142# else
143 dTHX;
144#ifdef NETWARE
145 if (PerlLIO_setmode(fp, mode) != -1) {
146#else
147 if (PerlLIO_setmode(fileno(fp), mode) != -1) {
148#endif
149# if defined(WIN32) && defined(__BORLANDC__)
150 /*
151 * The translation mode of the stream is maintained independent
152of
153 * the translation mode of the fd in the Borland RTL (heavy
154 * digging through their runtime sources reveal). User has to
155set
156 * the mode explicitly for the stream (though they don't
157document
158 * this anywhere). GSAR 97-5-24
159 */
160 fseek(fp, 0L, 0);
161 if (mode & O_BINARY)
162 fp->flags |= _F_BIN;
163 else
164 fp->flags &= ~_F_BIN;
165# endif
166 return 1;
167 }
168 else
169 return 0;
170# endif
171#else
172# if defined(USEMYBINMODE)
173 dTHX;
174 if (my_binmode(fp, iotype, mode) != FALSE)
175 return 1;
176 else
177 return 0;
178# else
179 PERL_UNUSED_ARG(fp);
180 PERL_UNUSED_ARG(iotype);
181 PERL_UNUSED_ARG(mode);
182 return 1;
183# endif
184#endif
185}
186#endif /* sfio */
187
06c7082d 188#ifndef O_ACCMODE
22569500 189#define O_ACCMODE 3 /* Assume traditional implementation */
06c7082d
NIS		 190#endif
191
192int
193PerlIO_intmode2str(int rawmode, char *mode, int *writing)
194{
de009b76 195 const int result = rawmode & O_ACCMODE;
06c7082d
NIS		 196 int ix = 0;
197 int ptype;
198 switch (result) {
199 case O_RDONLY:
200 ptype = IoTYPE_RDONLY;
201 break;
202 case O_WRONLY:
203 ptype = IoTYPE_WRONLY;
204 break;
205 case O_RDWR:
206 default:
207 ptype = IoTYPE_RDWR;
208 break;
209 }
210 if (writing)
211 *writing = (result != O_RDONLY);
212
213 if (result == O_RDONLY) {
214 mode[ix++] = 'r';
215 }
216#ifdef O_APPEND
217 else if (rawmode & O_APPEND) {
218 mode[ix++] = 'a';
219 if (result != O_WRONLY)
220 mode[ix++] = '+';
221 }
222#endif
223 else {
224 if (result == O_WRONLY)
225 mode[ix++] = 'w';
226 else {
227 mode[ix++] = 'r';
228 mode[ix++] = '+';
229 }
230 }
231 if (rawmode & O_BINARY)
232 mode[ix++] = 'b';
233 mode[ix] = '\0';
234 return ptype;
235}
236
eb73beca
NIS		 237#ifndef PERLIO_LAYERS
238int
239PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
240{
6874a2de
NIS		 241 if (!names || !*names
242 || strEQ(names, ":crlf")
243 || strEQ(names, ":raw")
244 || strEQ(names, ":bytes")
245 ) {
14a5cf38
JH		 246 return 0;
247 }
248 Perl_croak(aTHX_ "Cannot apply \"%s\" in non-PerlIO perl", names);
249 /*
71200d45 250 * NOTREACHED
14a5cf38
JH		 251 */
252 return -1;
eb73beca
NIS		 253}
254
13621cfb
NIS		 255void
256PerlIO_destruct(pTHX)
257{
258}
259
f5b9d040
NIS		 260int
261PerlIO_binmode(pTHX_ PerlIO *fp, int iotype, int mode, const char *names)
262{
92bff44d 263#ifdef USE_SFIO
8772537c
AL		 264 PERL_UNUSED_ARG(iotype);
265 PERL_UNUSED_ARG(mode);
266 PERL_UNUSED_ARG(names);
14a5cf38 267 return 1;
92bff44d 268#else
14a5cf38 269 return perlsio_binmode(fp, iotype, mode);
92bff44d 270#endif
f5b9d040 271}
60382766 272
e0fa5af2 273PerlIO *
ecdeb87c 274PerlIO_fdupopen(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
e0fa5af2 275{
a0fd4948 276#if defined(PERL_MICRO) || defined(__SYMBIAN32__)
0553478e
NIS		 277 return NULL;
278#else
279#ifdef PERL_IMPLICIT_SYS
22569500 280 return PerlSIO_fdupopen(f);
0553478e 281#else
30753f56
NIS		 282#ifdef WIN32
283 return win32_fdupopen(f);
284#else
e0fa5af2 285 if (f) {
504618e9 286 const int fd = PerlLIO_dup(PerlIO_fileno(f));
e0fa5af2 287 if (fd >= 0) {
06c7082d 288 char mode[8];
a5936e02 289#ifdef DJGPP
dcda55fc
AL		 290 const int omode = djgpp_get_stream_mode(f);
291#else
292 const int omode = fcntl(fd, F_GETFL);
a5936e02 293#endif
06c7082d 294 PerlIO_intmode2str(omode,mode,NULL);
e0fa5af2 295 /* the r+ is a hack */
06c7082d 296 return PerlIO_fdopen(fd, mode);
e0fa5af2
NIS		 297 }
298 return NULL;
299 }
300 else {
93189314 301 SETERRNO(EBADF, SS_IVCHAN);
e0fa5af2 302 }
7114a2d2 303#endif
e0fa5af2 304 return NULL;
0553478e 305#endif
30753f56 306#endif
e0fa5af2
NIS		 307}
308
309
14a5cf38 310/*
71200d45 311 * De-mux PerlIO_openn() into fdopen, freopen and fopen type entries
14a5cf38 312 */
ee518936
NIS		 313
314PerlIO *
14a5cf38
JH		 315PerlIO_openn(pTHX_ const char *layers, const char *mode, int fd,
316 int imode, int perm, PerlIO *old, int narg, SV **args)
317{
7cf31beb
NIS		 318 if (narg) {
319 if (narg > 1) {
3b8752bb 320 Perl_croak(aTHX_ "More than one argument to open");
7cf31beb 321 }
14a5cf38
JH		 322 if (*args == &PL_sv_undef)
323 return PerlIO_tmpfile();
324 else {
e62f0680 325 const char *name = SvPV_nolen_const(*args);
3b6c1aba 326 if (*mode == IoTYPE_NUMERIC) {
14a5cf38
JH		 327 fd = PerlLIO_open3(name, imode, perm);
328 if (fd >= 0)
de009b76 329 return PerlIO_fdopen(fd, mode + 1);
14a5cf38
JH		 330 }
331 else if (old) {
332 return PerlIO_reopen(name, mode, old);
333 }
334 else {
335 return PerlIO_open(name, mode);
336 }
337 }
338 }
339 else {
340 return PerlIO_fdopen(fd, (char *) mode);
341 }
342 return NULL;
ee518936
NIS		 343}
344
0c4f7ff0
NIS		 345XS(XS_PerlIO__Layer__find)
346{
14a5cf38
JH		 347 dXSARGS;
348 if (items < 2)
349 Perl_croak(aTHX_ "Usage class->find(name[,load])");
350 else {
dcda55fc 351 const char * const name = SvPV_nolen_const(ST(1));
14a5cf38
JH		 352 ST(0) = (strEQ(name, "crlf")
353 || strEQ(name, "raw")) ? &PL_sv_yes : &PL_sv_undef;
354 XSRETURN(1);
355 }
0c4f7ff0
NIS		 356}
357
358
359void
360Perl_boot_core_PerlIO(pTHX)
361{
14a5cf38 362 newXS("PerlIO::Layer::find", XS_PerlIO__Layer__find, __FILE__);
0c4f7ff0
NIS		 363}
364
ac27b0f5
NIS		 365#endif
366
32e30700 367
6f9d8c32 368#ifdef PERLIO_IS_STDIO
760ac839
LW		 369
370void
e8632036 371PerlIO_init(pTHX)
760ac839 372{
96a5add6 373 PERL_UNUSED_CONTEXT;
14a5cf38
JH		 374 /*
375 * Does nothing (yet) except force this file to be included in perl
71200d45 376 * binary. That allows this file to force inclusion of other functions
14a5cf38 377 * that may be required by loadable extensions e.g. for
71200d45 378 * FileHandle::tmpfile
14a5cf38 379 */
760ac839
LW		 380}
381
33dcbb9a 382#undef PerlIO_tmpfile
383PerlIO *
8ac85365 384PerlIO_tmpfile(void)
33dcbb9a 385{
14a5cf38 386 return tmpfile();
33dcbb9a 387}
388
22569500 389#else /* PERLIO_IS_STDIO */
760ac839
LW		 390
391#ifdef USE_SFIO
392
393#undef HAS_FSETPOS
394#undef HAS_FGETPOS
395
14a5cf38
JH		 396/*
397 * This section is just to make sure these functions get pulled in from
71200d45 398 * libsfio.a
14a5cf38 399 */
760ac839
LW		 400
401#undef PerlIO_tmpfile
402PerlIO *
c78749f2 403PerlIO_tmpfile(void)
760ac839 404{
14a5cf38 405 return sftmp(0);
760ac839
LW		 406}
407
408void
e8632036 409PerlIO_init(pTHX)
760ac839 410{
96a5add6 411 PERL_UNUSED_CONTEXT;
14a5cf38
JH		 412 /*
413 * Force this file to be included in perl binary. Which allows this
414 * file to force inclusion of other functions that may be required by
71200d45 415 * loadable extensions e.g. for FileHandle::tmpfile
14a5cf38 416 */
760ac839 417
14a5cf38 418 /*
71200d45 419 * Hack sfio does its own 'autoflush' on stdout in common cases. Flush
14a5cf38 420 * results in a lot of lseek()s to regular files and lot of small
71200d45 421 * writes to pipes.
14a5cf38
JH		 422 */
423 sfset(sfstdout, SF_SHARE, 0);
760ac839
LW		 424}
425
b9d6bf13 426/* This is not the reverse of PerlIO_exportFILE(), PerlIO_releaseFILE() is. */
92bff44d 427PerlIO *
4b069b44 428PerlIO_importFILE(FILE *stdio, const char *mode)
92bff44d 429{
de009b76 430 const int fd = fileno(stdio);
4b069b44 431 if (!mode || !*mode) {
81428673 432 mode = "r+";
4b069b44
NIS		 433 }
434 return PerlIO_fdopen(fd, mode);
92bff44d
NIS		 435}
436
437FILE *
438PerlIO_findFILE(PerlIO *pio)
439{
de009b76
AL		 440 const int fd = PerlIO_fileno(pio);
441 FILE * const f = fdopen(fd, "r+");
14a5cf38
JH		 442 PerlIO_flush(pio);
443 if (!f && errno == EINVAL)
444 f = fdopen(fd, "w");
445 if (!f && errno == EINVAL)
446 f = fdopen(fd, "r");
447 return f;
92bff44d
NIS		 448}
449
450
22569500 451#else /* USE_SFIO */
6f9d8c32 452/*======================================================================================*/
14a5cf38 453/*
71200d45 454 * Implement all the PerlIO interface ourselves.
9e353e3b 455 */
760ac839 456
76ced9ad
NIS		 457#include "perliol.h"
458
14a5cf38
JH		 459/*
460 * We _MUST_ have <unistd.h> if we are using lseek() and may have large
71200d45 461 * files
14a5cf38 462 */
02f66e2f
NIS		 463#ifdef I_UNISTD
464#include <unistd.h>
465#endif
06da4f11
NIS		 466#ifdef HAS_MMAP
467#include <sys/mman.h>
468#endif
469
6f9d8c32 470void
14a5cf38
JH		 471PerlIO_debug(const char *fmt, ...)
472{
14a5cf38
JH		 473 va_list ap;
474 dSYS;
475 va_start(ap, fmt);
582588d2
NC		 476 if (!PL_perlio_debug_fd) {
477 if (!PL_tainting && PL_uid == PL_euid && PL_gid == PL_egid) {
478 const char * const s = PerlEnv_getenv("PERLIO_DEBUG");
479 if (s && *s)
480 PL_perlio_debug_fd
481 = PerlLIO_open3(s, O_WRONLY | O_CREAT | O_APPEND, 0666);
482 else
483 PL_perlio_debug_fd = -1;
484 } else {
485 /* tainting or set*id, so ignore the environment, and ensure we
486 skip these tests next time through. */
27da23d5 487 PL_perlio_debug_fd = -1;
582588d2 488 }
14a5cf38 489 }
27da23d5 490 if (PL_perlio_debug_fd > 0) {
14a5cf38 491 dTHX;
70ace5da 492#ifdef USE_ITHREADS
dcda55fc 493 const char * const s = CopFILE(PL_curcop);
70ace5da
NIS		 494 /* Use fixed buffer as sv_catpvf etc. needs SVs */
495 char buffer[1024];
1208b3dd
JH		 496 const STRLEN len1 = my_snprintf(buffer, sizeof(buffer), "%.40s:%" IVdf " ", s ? s : "(none)", (IV) CopLINE(PL_curcop));
497 const STRLEN len2 = my_vsnprintf(buffer + len1, sizeof(buffer) - len1, fmt, ap);
498 PerlLIO_write(PL_perlio_debug_fd, buffer, len1 + len2);
70ace5da 499#else
dcda55fc
AL		 500 const char *s = CopFILE(PL_curcop);
501 STRLEN len;
396482e1 502 SV * const sv = newSVpvs("");
dcda55fc 503 Perl_sv_catpvf(aTHX_ sv, "%s:%" IVdf " ", s ? s : "(none)",
14a5cf38
JH		 504 (IV) CopLINE(PL_curcop));
505 Perl_sv_vcatpvf(aTHX_ sv, fmt, &ap);
506
b83604b4 507 s = SvPV_const(sv, len);
27da23d5 508 PerlLIO_write(PL_perlio_debug_fd, s, len);
14a5cf38 509 SvREFCNT_dec(sv);
70ace5da 510#endif
14a5cf38
JH		 511 }
512 va_end(ap);
6f9d8c32
NIS		 513}
514
9e353e3b
NIS		 515/*--------------------------------------------------------------------------------------*/
516
14a5cf38 517/*
71200d45 518 * Inner level routines
14a5cf38 519 */
9e353e3b 520
14a5cf38 521/*
71200d45 522 * Table of pointers to the PerlIO structs (malloc'ed)
14a5cf38 523 */
05d1247b 524#define PERLIO_TABLE_SIZE 64
6f9d8c32 525
760ac839 526PerlIO *
5f1a76d0 527PerlIO_allocate(pTHX)
6f9d8c32 528{
97aff369 529 dVAR;
14a5cf38 530 /*
71200d45 531 * Find a free slot in the table, allocating new table as necessary
14a5cf38
JH		 532 */
533 PerlIO **last;
534 PerlIO *f;
a1ea730d 535 last = &PL_perlio;
14a5cf38
JH		 536 while ((f = *last)) {
537 int i;
538 last = (PerlIO **) (f);
539 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
540 if (!*++f) {
541 return f;
542 }
543 }
544 }
a02a5408 545 Newxz(f,PERLIO_TABLE_SIZE,PerlIO);
14a5cf38
JH		 546 if (!f) {
547 return NULL;
548 }
549 *last = f;
550 return f + 1;
05d1247b
NIS		 551}
552
a1ea730d
NIS		 553#undef PerlIO_fdupopen
554PerlIO *
ecdeb87c 555PerlIO_fdupopen(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
a1ea730d 556{
04892f78 557 if (PerlIOValid(f)) {
de009b76 558 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
fe5a182c 559 PerlIO_debug("fdupopen f=%p param=%p\n",(void*)f,(void*)param);
210e727c
JH		 560 if (tab && tab->Dup)
561 return (*tab->Dup)(aTHX_ PerlIO_allocate(aTHX), f, param, flags);
37725cdc
NIS		 562 else {
563 return PerlIOBase_dup(aTHX_ PerlIO_allocate(aTHX), f, param, flags);
564 }
a1ea730d 565 }
210e727c
JH		 566 else
567 SETERRNO(EBADF, SS_IVCHAN);
568
569 return NULL;
a1ea730d
NIS		 570}
571
572void
5f1a76d0 573PerlIO_cleantable(pTHX_ PerlIO **tablep)
05d1247b 574{
dcda55fc 575 PerlIO * const table = *tablep;
14a5cf38
JH		 576 if (table) {
577 int i;
578 PerlIO_cleantable(aTHX_(PerlIO **) & (table[0]));
579 for (i = PERLIO_TABLE_SIZE - 1; i > 0; i--) {
dcda55fc 580 PerlIO * const f = table + i;
14a5cf38
JH		 581 if (*f) {
582 PerlIO_close(f);
583 }
584 }
3a1ee7e8 585 Safefree(table);
14a5cf38 586 *tablep = NULL;
05d1247b 587 }
05d1247b
NIS		 588}
589
fcf2db38
NIS		 590
591PerlIO_list_t *
3a1ee7e8 592PerlIO_list_alloc(pTHX)
fcf2db38 593{
14a5cf38 594 PerlIO_list_t *list;
96a5add6 595 PERL_UNUSED_CONTEXT;
a02a5408 596 Newxz(list, 1, PerlIO_list_t);
14a5cf38
JH		 597 list->refcnt = 1;
598 return list;
fcf2db38
NIS		 599}
600
601void
3a1ee7e8 602PerlIO_list_free(pTHX_ PerlIO_list_t *list)
fcf2db38 603{
14a5cf38
JH		 604 if (list) {
605 if (--list->refcnt == 0) {
606 if (list->array) {
14a5cf38
JH		 607 IV i;
608 for (i = 0; i < list->cur; i++) {
609 if (list->array[i].arg)
610 SvREFCNT_dec(list->array[i].arg);
611 }
612 Safefree(list->array);
613 }
614 Safefree(list);
615 }
616 }
fcf2db38
NIS		 617}
618
619void
3a1ee7e8 620PerlIO_list_push(pTHX_ PerlIO_list_t *list, PerlIO_funcs *funcs, SV *arg)
14a5cf38 621{
97aff369 622 dVAR;
334e202e 623 PerlIO_pair_t *p;
b37c2d43
AL		 624 PERL_UNUSED_CONTEXT;
625
14a5cf38
JH		 626 if (list->cur >= list->len) {
627 list->len += 8;
628 if (list->array)
629 Renew(list->array, list->len, PerlIO_pair_t);
630 else
a02a5408 631 Newx(list->array, list->len, PerlIO_pair_t);
14a5cf38
JH		 632 }
633 p = &(list->array[list->cur++]);
634 p->funcs = funcs;
635 if ((p->arg = arg)) {
f84c484e 636 SvREFCNT_inc_simple_void_NN(arg);
14a5cf38 637 }
fcf2db38
NIS		 638}
639
3a1ee7e8
NIS		 640PerlIO_list_t *
641PerlIO_clone_list(pTHX_ PerlIO_list_t *proto, CLONE_PARAMS *param)
642{
b37c2d43 643 PerlIO_list_t *list = NULL;
694c95cf
JH		 644 if (proto) {
645 int i;
646 list = PerlIO_list_alloc(aTHX);
647 for (i=0; i < proto->cur; i++) {
a0714e2c 648 SV *arg = NULL;
694c95cf
JH		 649 if (proto->array[i].arg)
650 arg = PerlIO_sv_dup(aTHX_ proto->array[i].arg,param);
651 PerlIO_list_push(aTHX_ list, proto->array[i].funcs, arg);
652 }
3a1ee7e8
NIS		 653 }
654 return list;
655}
4a4a6116 656
05d1247b 657void
3a1ee7e8 658PerlIO_clone(pTHX_ PerlInterpreter *proto, CLONE_PARAMS *param)
9a6404c5 659{
3aaf42a7 660#ifdef USE_ITHREADS
3a1ee7e8
NIS		 661 PerlIO **table = &proto->Iperlio;
662 PerlIO *f;
663 PL_perlio = NULL;
664 PL_known_layers = PerlIO_clone_list(aTHX_ proto->Iknown_layers, param);
665 PL_def_layerlist = PerlIO_clone_list(aTHX_ proto->Idef_layerlist, param);
666 PerlIO_allocate(aTHX); /* root slot is never used */
a25429c6 667 PerlIO_debug("Clone %p from %p\n",(void*)aTHX,(void*)proto);
3a1ee7e8
NIS		 668 while ((f = *table)) {
669 int i;
670 table = (PerlIO **) (f++);
671 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
672 if (*f) {
93a8090d 673 (void) fp_dup(f, 0, param);
3a1ee7e8
NIS		 674 }
675 f++;
676 }
677 }
1b6737cc 678#else
a25429c6 679 PERL_UNUSED_CONTEXT;
1b6737cc
AL		 680 PERL_UNUSED_ARG(proto);
681 PERL_UNUSED_ARG(param);
3aaf42a7 682#endif
9a6404c5
DM		 683}
684
685void
13621cfb
NIS		 686PerlIO_destruct(pTHX)
687{
97aff369 688 dVAR;
a1ea730d 689 PerlIO **table = &PL_perlio;
14a5cf38 690 PerlIO *f;
694c95cf 691#ifdef USE_ITHREADS
a25429c6 692 PerlIO_debug("Destruct %p\n",(void*)aTHX);
694c95cf 693#endif
14a5cf38
JH		 694 while ((f = *table)) {
695 int i;
696 table = (PerlIO **) (f++);
697 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
698 PerlIO *x = f;
dcda55fc 699 const PerlIOl *l;
14a5cf38
JH		 700 while ((l = *x)) {
701 if (l->tab->kind & PERLIO_K_DESTRUCT) {
702 PerlIO_debug("Destruct popping %s\n", l->tab->name);
703 PerlIO_flush(x);
704 PerlIO_pop(aTHX_ x);
705 }
706 else {
707 x = PerlIONext(x);
708 }
709 }
710 f++;
711 }
712 }
13621cfb
NIS		 713}
714
715void
a999f61b 716PerlIO_pop(pTHX_ PerlIO *f)
760ac839 717{
dcda55fc 718 const PerlIOl *l = *f;
14a5cf38 719 if (l) {
fe5a182c 720 PerlIO_debug("PerlIO_pop f=%p %s\n", (void*)f, l->tab->name);
14a5cf38
JH		 721 if (l->tab->Popped) {
722 /*
723 * If popped returns non-zero do not free its layer structure
724 * it has either done so itself, or it is shared and still in
71200d45 725 * use
14a5cf38 726 */
f62ce20a 727 if ((*l->tab->Popped) (aTHX_ f) != 0)
14a5cf38
JH		 728 return;
729 }
b47cad08 730 *f = l->next;
3a1ee7e8 731 Safefree(l);
a8c08ecd 732 }
6f9d8c32
NIS		 733}
734
39f7a870
JH		 735/* Return as an array the stack of layers on a filehandle. Note that
736 * the stack is returned top-first in the array, and there are three
737 * times as many array elements as there are layers in the stack: the
738 * first element of a layer triplet is the name, the second one is the
739 * arguments, and the third one is the flags. */
740
741AV *
742PerlIO_get_layers(pTHX_ PerlIO *f)
743{
97aff369 744 dVAR;
dcda55fc 745 AV * const av = newAV();
39f7a870 746
dcda55fc
AL		 747 if (PerlIOValid(f)) {
748 PerlIOl *l = PerlIOBase(f);
749
750 while (l) {
751 SV * const name = l->tab && l->tab->name ?
752 newSVpv(l->tab->name, 0) : &PL_sv_undef;
753 SV * const arg = l->tab && l->tab->Getarg ?
754 (*l->tab->Getarg)(aTHX_ &l, 0, 0) : &PL_sv_undef;
755 av_push(av, name);
756 av_push(av, arg);
757 av_push(av, newSViv((IV)l->flags));
758 l = l->next;
759 }
760 }
39f7a870 761
dcda55fc 762 return av;
39f7a870
JH		 763}
764
9e353e3b 765/*--------------------------------------------------------------------------------------*/
14a5cf38 766/*
71200d45 767 * XS Interface for perl code
14a5cf38 768 */
9e353e3b 769
fcf2db38 770PerlIO_funcs *
2edd7e44 771PerlIO_find_layer(pTHX_ const char *name, STRLEN len, int load)
f3862f8b 772{
27da23d5 773 dVAR;
14a5cf38
JH		 774 IV i;
775 if ((SSize_t) len <= 0)
776 len = strlen(name);
3a1ee7e8 777 for (i = 0; i < PL_known_layers->cur; i++) {
46c461b5 778 PerlIO_funcs * const f = PL_known_layers->array[i].funcs;
a9f76400 779 if (memEQ(f->name, name, len) && f->name[len] == 0) {
fe5a182c 780 PerlIO_debug("%.*s => %p\n", (int) len, name, (void*)f);
14a5cf38
JH		 781 return f;
782 }
783 }
3a1ee7e8
NIS		 784 if (load && PL_subname && PL_def_layerlist
785 && PL_def_layerlist->cur >= 2) {
d7a09b41
SR		 786 if (PL_in_load_module) {
787 Perl_croak(aTHX_ "Recursive call to Perl_load_module in PerlIO_find_layer");
788 return NULL;
789 } else {
396482e1 790 SV * const pkgsv = newSVpvs("PerlIO");
46c461b5
AL		 791 SV * const layer = newSVpvn(name, len);
792 CV * const cv = get_cv("PerlIO::Layer::NoWarnings", FALSE);
793 ENTER;
d7a09b41 794 SAVEINT(PL_in_load_module);
c9bca74a 795 if (cv) {
9cfa90c0 796 SAVEGENERICSV(PL_warnhook);
b37c2d43 797 PL_warnhook = (SV *) (SvREFCNT_inc_simple_NN(cv));
c9bca74a 798 }
d7a09b41
SR		 799 PL_in_load_module++;
800 /*
801 * The two SVs are magically freed by load_module
802 */
a0714e2c 803 Perl_load_module(aTHX_ 0, pkgsv, NULL, layer, NULL);
d7a09b41
SR		 804 PL_in_load_module--;
805 LEAVE;
806 return PerlIO_find_layer(aTHX_ name, len, 0);
807 }
14a5cf38
JH		 808 }
809 PerlIO_debug("Cannot find %.*s\n", (int) len, name);
810 return NULL;
f3862f8b
NIS		 811}
812
2a1bc955 813#ifdef USE_ATTRIBUTES_FOR_PERLIO
b13b2135
NIS		 814
815static int
816perlio_mg_set(pTHX_ SV *sv, MAGIC *mg)
817{
14a5cf38 818 if (SvROK(sv)) {
dcda55fc
AL		 819 IO * const io = GvIOn((GV *) SvRV(sv));
820 PerlIO * const ifp = IoIFP(io);
821 PerlIO * const ofp = IoOFP(io);
14a5cf38
JH		 822 Perl_warn(aTHX_ "set %" SVf " %p %p %p", sv, io, ifp, ofp);
823 }
824 return 0;
b13b2135
NIS		 825}
826
827static int
828perlio_mg_get(pTHX_ SV *sv, MAGIC *mg)
829{
14a5cf38 830 if (SvROK(sv)) {
dcda55fc
AL		 831 IO * const io = GvIOn((GV *) SvRV(sv));
832 PerlIO * const ifp = IoIFP(io);
833 PerlIO * const ofp = IoOFP(io);
14a5cf38
JH		 834 Perl_warn(aTHX_ "get %" SVf " %p %p %p", sv, io, ifp, ofp);
835 }
836 return 0;
b13b2135
NIS		 837}
838
839static int
840perlio_mg_clear(pTHX_ SV *sv, MAGIC *mg)
841{
14a5cf38
JH		 842 Perl_warn(aTHX_ "clear %" SVf, sv);
843 return 0;
b13b2135
NIS		 844}
845
846static int
847perlio_mg_free(pTHX_ SV *sv, MAGIC *mg)
848{
14a5cf38
JH		 849 Perl_warn(aTHX_ "free %" SVf, sv);
850 return 0;
b13b2135
NIS		 851}
852
853MGVTBL perlio_vtab = {
14a5cf38
JH		 854 perlio_mg_get,
855 perlio_mg_set,
22569500 856 NULL, /* len */
14a5cf38
JH		 857 perlio_mg_clear,
858 perlio_mg_free
b13b2135
NIS		 859};
860
861XS(XS_io_MODIFY_SCALAR_ATTRIBUTES)
862{
14a5cf38 863 dXSARGS;
dcda55fc
AL		 864 SV * const sv = SvRV(ST(1));
865 AV * const av = newAV();
14a5cf38
JH		 866 MAGIC *mg;
867 int count = 0;
868 int i;
869 sv_magic(sv, (SV *) av, PERL_MAGIC_ext, NULL, 0);
870 SvRMAGICAL_off(sv);
871 mg = mg_find(sv, PERL_MAGIC_ext);
872 mg->mg_virtual = &perlio_vtab;
873 mg_magical(sv);
874 Perl_warn(aTHX_ "attrib %" SVf, sv);
875 for (i = 2; i < items; i++) {
876 STRLEN len;
dcda55fc
AL		 877 const char * const name = SvPV_const(ST(i), len);
878 SV * const layer = PerlIO_find_layer(aTHX_ name, len, 1);
14a5cf38 879 if (layer) {
b37c2d43 880 av_push(av, SvREFCNT_inc_simple_NN(layer));
14a5cf38
JH		 881 }
882 else {
883 ST(count) = ST(i);
884 count++;
885 }
886 }
887 SvREFCNT_dec(av);
888 XSRETURN(count);
889}
890
22569500 891#endif /* USE_ATTIBUTES_FOR_PERLIO */
2a1bc955 892
e3f3bf95
NIS		 893SV *
894PerlIO_tab_sv(pTHX_ PerlIO_funcs *tab)
f3862f8b 895{
89529cee 896 HV * const stash = gv_stashpvs("PerlIO::Layer", TRUE);
46c461b5 897 SV * const sv = sv_bless(newRV_noinc(newSViv(PTR2IV(tab))), stash);
14a5cf38 898 return sv;
e3f3bf95
NIS		 899}
900
5ca1d77f 901XS(XS_PerlIO__Layer__NoWarnings)
c9bca74a 902{
37725cdc 903 /* This is used as a %SIG{__WARN__} handler to supress warnings
c9bca74a
NIS		 904 during loading of layers.
905 */
97aff369 906 dVAR;
c9bca74a
NIS		 907 dXSARGS;
908 if (items)
e62f0680 909 PerlIO_debug("warning:%s\n",SvPV_nolen_const(ST(0)));
c9bca74a
NIS		 910 XSRETURN(0);
911}
912
5ca1d77f 913XS(XS_PerlIO__Layer__find)
0c4f7ff0 914{
97aff369 915 dVAR;
14a5cf38
JH		 916 dXSARGS;
917 if (items < 2)
918 Perl_croak(aTHX_ "Usage class->find(name[,load])");
919 else {
de009b76 920 STRLEN len;
46c461b5 921 const char * const name = SvPV_const(ST(1), len);
de009b76 922 const bool load = (items > 2) ? SvTRUE(ST(2)) : 0;
46c461b5 923 PerlIO_funcs * const layer = PerlIO_find_layer(aTHX_ name, len, load);
14a5cf38
JH		 924 ST(0) =
925 (layer) ? sv_2mortal(PerlIO_tab_sv(aTHX_ layer)) :
926 &PL_sv_undef;
927 XSRETURN(1);
928 }
0c4f7ff0
NIS		 929}
930
e3f3bf95
NIS		 931void
932PerlIO_define_layer(pTHX_ PerlIO_funcs *tab)
933{
97aff369 934 dVAR;
3a1ee7e8
NIS		 935 if (!PL_known_layers)
936 PL_known_layers = PerlIO_list_alloc(aTHX);
a0714e2c 937 PerlIO_list_push(aTHX_ PL_known_layers, tab, NULL);
fe5a182c 938 PerlIO_debug("define %s %p\n", tab->name, (void*)tab);
f3862f8b
NIS		 939}
940
1141d9f8 941int
fcf2db38 942PerlIO_parse_layers(pTHX_ PerlIO_list_t *av, const char *names)
1141d9f8 943{
97aff369 944 dVAR;
14a5cf38
JH		 945 if (names) {
946 const char *s = names;
947 while (*s) {
948 while (isSPACE(*s) || *s == ':')
949 s++;
950 if (*s) {
951 STRLEN llen = 0;
952 const char *e = s;
bd61b366 953 const char *as = NULL;
14a5cf38
JH		 954 STRLEN alen = 0;
955 if (!isIDFIRST(*s)) {
956 /*
957 * Message is consistent with how attribute lists are
958 * passed. Even though this means "foo : : bar" is
71200d45 959 * seen as an invalid separator character.
14a5cf38 960 */
de009b76 961 const char q = ((*s == '\'') ? '"' : '\'');
99ef548b 962 if (ckWARN(WARN_LAYER))
22569500 963 Perl_warner(aTHX_ packWARN(WARN_LAYER),
b4581f09 964 "Invalid separator character %c%c%c in PerlIO layer specification %s",
1e616cf5 965 q, *s, q, s);
93189314 966 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH		 967 return -1;
968 }
969 do {
970 e++;
971 } while (isALNUM(*e));
972 llen = e - s;
973 if (*e == '(') {
974 int nesting = 1;
975 as = ++e;
976 while (nesting) {
977 switch (*e++) {
978 case ')':
979 if (--nesting == 0)
980 alen = (e - 1) - as;
981 break;
982 case '(':
983 ++nesting;
984 break;
985 case '\\':
986 /*
987 * It's a nul terminated string, not allowed
988 * to \ the terminating null. Anything other
71200d45 989 * character is passed over.
14a5cf38
JH		 990 */
991 if (*e++) {
992 break;
993 }
994 /*
71200d45 995 * Drop through
14a5cf38
JH		 996 */
997 case '\0':
998 e--;
22569500
NIS		 999 if (ckWARN(WARN_LAYER))
1000 Perl_warner(aTHX_ packWARN(WARN_LAYER),
b4581f09 1001 "Argument list not closed for PerlIO layer \"%.*s\"",
14a5cf38
JH		 1002 (int) (e - s), s);
1003 return -1;
1004 default:
1005 /*
71200d45 1006 * boring.
14a5cf38
JH		 1007 */
1008 break;
1009 }
1010 }
1011 }
1012 if (e > s) {
46c461b5 1013 PerlIO_funcs * const layer =
14a5cf38
JH		 1014 PerlIO_find_layer(aTHX_ s, llen, 1);
1015 if (layer) {
3a1ee7e8 1016 PerlIO_list_push(aTHX_ av, layer,
14a5cf38
JH		 1017 (as) ? newSVpvn(as,
1018 alen) :
1019 &PL_sv_undef);
1020 }
1021 else {
041457d9 1022 if (ckWARN(WARN_LAYER))
b4581f09 1023 Perl_warner(aTHX_ packWARN(WARN_LAYER), "Unknown PerlIO layer \"%.*s\"",
14a5cf38
JH		 1024 (int) llen, s);
1025 return -1;
1026 }
1027 }
1028 s = e;
1029 }
1030 }
1031 }
1032 return 0;
1141d9f8
NIS		 1033}
1034
dfebf958 1035void
fcf2db38 1036PerlIO_default_buffer(pTHX_ PerlIO_list_t *av)
dfebf958 1037{
97aff369 1038 dVAR;
27da23d5 1039 PERLIO_FUNCS_DECL(*tab) = &PerlIO_perlio;
35990314 1040#ifdef PERLIO_USING_CRLF
6ce75a77 1041 tab = &PerlIO_crlf;
846be114 1042#else
6ce75a77 1043 if (PerlIO_stdio.Set_ptrcnt)
22569500 1044 tab = &PerlIO_stdio;
846be114 1045#endif
14a5cf38 1046 PerlIO_debug("Pushing %s\n", tab->name);
3a1ee7e8 1047 PerlIO_list_push(aTHX_ av, PerlIO_find_layer(aTHX_ tab->name, 0, 0),
14a5cf38 1048 &PL_sv_undef);
dfebf958
NIS		 1049}
1050
e3f3bf95 1051SV *
14a5cf38 1052PerlIO_arg_fetch(PerlIO_list_t *av, IV n)
e3f3bf95 1053{
14a5cf38 1054 return av->array[n].arg;
e3f3bf95
NIS		 1055}
1056
f3862f8b 1057PerlIO_funcs *
14a5cf38 1058PerlIO_layer_fetch(pTHX_ PerlIO_list_t *av, IV n, PerlIO_funcs *def)
f3862f8b 1059{
14a5cf38
JH		 1060 if (n >= 0 && n < av->cur) {
1061 PerlIO_debug("Layer %" IVdf " is %s\n", n,
1062 av->array[n].funcs->name);
1063 return av->array[n].funcs;
1064 }
1065 if (!def)
1066 Perl_croak(aTHX_ "panic: PerlIO layer array corrupt");
1067 return def;
e3f3bf95
NIS		 1068}
1069
4ec2216f
NIS		 1070IV
1071PerlIOPop_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
1072{
8772537c
AL		 1073 PERL_UNUSED_ARG(mode);
1074 PERL_UNUSED_ARG(arg);
1075 PERL_UNUSED_ARG(tab);
4ec2216f
NIS		 1076 if (PerlIOValid(f)) {
1077 PerlIO_flush(f);
1078 PerlIO_pop(aTHX_ f);
1079 return 0;
1080 }
1081 return -1;
1082}
1083
27da23d5 1084PERLIO_FUNCS_DECL(PerlIO_remove) = {
4ec2216f
NIS		 1085 sizeof(PerlIO_funcs),
1086 "pop",
1087 0,
1088 PERLIO_K_DUMMY | PERLIO_K_UTF8,
1089 PerlIOPop_pushed,
1090 NULL,
1091 NULL,
1092 NULL,
1093 NULL,
1094 NULL,
1095 NULL,
1096 NULL,
1097 NULL,
1098 NULL,
1099 NULL,
de009b76
AL		 1100 NULL,
1101 NULL,
4ec2216f
NIS		 1102 NULL, /* flush */
1103 NULL, /* fill */
1104 NULL,
1105 NULL,
1106 NULL,
1107 NULL,
1108 NULL, /* get_base */
1109 NULL, /* get_bufsiz */
1110 NULL, /* get_ptr */
1111 NULL, /* get_cnt */
1112 NULL, /* set_ptrcnt */
1113};
1114
fcf2db38 1115PerlIO_list_t *
e3f3bf95
NIS		 1116PerlIO_default_layers(pTHX)
1117{
97aff369 1118 dVAR;
3a1ee7e8 1119 if (!PL_def_layerlist) {
bd61b366 1120 const char * const s = (PL_tainting) ? NULL : PerlEnv_getenv("PERLIO");
27da23d5 1121 PERLIO_FUNCS_DECL(*osLayer) = &PerlIO_unix;
3a1ee7e8 1122 PL_def_layerlist = PerlIO_list_alloc(aTHX);
27da23d5 1123 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_unix));
979e2c82 1124#if defined(WIN32)
27da23d5 1125 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_win32));
2f8118af 1126#if 0
14a5cf38 1127 osLayer = &PerlIO_win32;
0c4128ad 1128#endif
2f8118af 1129#endif
27da23d5
JH		 1130 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_raw));
1131 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_perlio));
1132 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_stdio));
1133 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_crlf));
06da4f11 1134#ifdef HAS_MMAP
27da23d5 1135 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_mmap));
06da4f11 1136#endif
27da23d5
JH		 1137 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_utf8));
1138 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_remove));
1139 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_byte));
3a1ee7e8 1140 PerlIO_list_push(aTHX_ PL_def_layerlist,
14a5cf38
JH		 1141 PerlIO_find_layer(aTHX_ osLayer->name, 0, 0),
1142 &PL_sv_undef);
1143 if (s) {
3a1ee7e8 1144 PerlIO_parse_layers(aTHX_ PL_def_layerlist, s);
14a5cf38
JH		 1145 }
1146 else {
3a1ee7e8 1147 PerlIO_default_buffer(aTHX_ PL_def_layerlist);
14a5cf38 1148 }
1141d9f8 1149 }
3a1ee7e8
NIS		 1150 if (PL_def_layerlist->cur < 2) {
1151 PerlIO_default_buffer(aTHX_ PL_def_layerlist);
f3862f8b 1152 }
3a1ee7e8 1153 return PL_def_layerlist;
e3f3bf95
NIS		 1154}
1155
0c4f7ff0
NIS		 1156void
1157Perl_boot_core_PerlIO(pTHX)
1158{
1159#ifdef USE_ATTRIBUTES_FOR_PERLIO
14a5cf38
JH		 1160 newXS("io::MODIFY_SCALAR_ATTRIBUTES", XS_io_MODIFY_SCALAR_ATTRIBUTES,
1161 __FILE__);
0c4f7ff0 1162#endif
14a5cf38 1163 newXS("PerlIO::Layer::find", XS_PerlIO__Layer__find, __FILE__);
c9bca74a 1164 newXS("PerlIO::Layer::NoWarnings", XS_PerlIO__Layer__NoWarnings, __FILE__);
0c4f7ff0 1165}
e3f3bf95
NIS		 1166
1167PerlIO_funcs *
1168PerlIO_default_layer(pTHX_ I32 n)
1169{
97aff369 1170 dVAR;
46c461b5 1171 PerlIO_list_t * const av = PerlIO_default_layers(aTHX);
14a5cf38
JH		 1172 if (n < 0)
1173 n += av->cur;
27da23d5 1174 return PerlIO_layer_fetch(aTHX_ av, n, PERLIO_FUNCS_CAST(&PerlIO_stdio));
f3862f8b
NIS		 1175}
1176
a999f61b
NIS		 1177#define PerlIO_default_top() PerlIO_default_layer(aTHX_ -1)
1178#define PerlIO_default_btm() PerlIO_default_layer(aTHX_ 0)
60382766
NIS		 1179
1180void
1141d9f8 1181PerlIO_stdstreams(pTHX)
60382766 1182{
97aff369 1183 dVAR;
a1ea730d 1184 if (!PL_perlio) {
14a5cf38
JH		 1185 PerlIO_allocate(aTHX);
1186 PerlIO_fdopen(0, "Ir" PERLIO_STDTEXT);
1187 PerlIO_fdopen(1, "Iw" PERLIO_STDTEXT);
1188 PerlIO_fdopen(2, "Iw" PERLIO_STDTEXT);
1189 }
60382766
NIS		 1190}
1191
1192PerlIO *
27da23d5 1193PerlIO_push(pTHX_ PerlIO *f, PERLIO_FUNCS_DECL(*tab), const char *mode, SV *arg)
14a5cf38 1194{
2dc2558e
NIS		 1195 if (tab->fsize != sizeof(PerlIO_funcs)) {
1196 mismatch:
1197 Perl_croak(aTHX_ "Layer does not match this perl");
1198 }
1199 if (tab->size) {
b464bac0 1200 PerlIOl *l;
2dc2558e
NIS		 1201 if (tab->size < sizeof(PerlIOl)) {
1202 goto mismatch;
1203 }
1204 /* Real layer with a data area */
002e75cf
JH		 1205 if (f) {
1206 char *temp;
1207 Newxz(temp, tab->size, char);
1208 l = (PerlIOl*)temp;
1209 if (l) {
1210 l->next = *f;
1211 l->tab = (PerlIO_funcs*) tab;
1212 *f = l;
1213 PerlIO_debug("PerlIO_push f=%p %s %s %p\n",
1214 (void*)f, tab->name,
1215 (mode) ? mode : "(Null)", (void*)arg);
1216 if (*l->tab->Pushed &&
1217 (*l->tab->Pushed)
1218 (aTHX_ f, mode, arg, (PerlIO_funcs*) tab) != 0) {
1219 PerlIO_pop(aTHX_ f);
1220 return NULL;
1221 }
2dc2558e 1222 }
002e75cf
JH		 1223 else
1224 return NULL;
2dc2558e
NIS		 1225 }
1226 }
1227 else if (f) {
1228 /* Pseudo-layer where push does its own stack adjust */
00f51856
NIS		 1229 PerlIO_debug("PerlIO_push f=%p %s %s %p\n", (void*)f, tab->name,
1230 (mode) ? mode : "(Null)", (void*)arg);
210e727c 1231 if (tab->Pushed &&
27da23d5 1232 (*tab->Pushed) (aTHX_ f, mode, arg, (PerlIO_funcs*) tab) != 0) {
210e727c 1233 return NULL;
14a5cf38
JH		 1234 }
1235 }
1236 return f;
60382766
NIS		 1237}
1238
dfebf958 1239IV
86e05cf2
NIS		 1240PerlIOBase_binmode(pTHX_ PerlIO *f)
1241{
1242 if (PerlIOValid(f)) {
1243 /* Is layer suitable for raw stream ? */
1244 if (PerlIOBase(f)->tab->kind & PERLIO_K_RAW) {
1245 /* Yes - turn off UTF-8-ness, to undo UTF-8 locale effects */
1246 PerlIOBase(f)->flags &= ~PERLIO_F_UTF8;
1247 }
1248 else {
1249 /* Not suitable - pop it */
1250 PerlIO_pop(aTHX_ f);
1251 }
1252 return 0;
1253 }
1254 return -1;
1255}
1256
1257IV
2dc2558e 1258PerlIORaw_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
dfebf958 1259{
8772537c
AL		 1260 PERL_UNUSED_ARG(mode);
1261 PERL_UNUSED_ARG(arg);
1262 PERL_UNUSED_ARG(tab);
86e05cf2 1263
04892f78 1264 if (PerlIOValid(f)) {
86e05cf2 1265 PerlIO *t;
de009b76 1266 const PerlIOl *l;
14a5cf38 1267 PerlIO_flush(f);
86e05cf2
NIS		 1268 /*
1269 * Strip all layers that are not suitable for a raw stream
1270 */
1271 t = f;
1272 while (t && (l = *t)) {
1273 if (l->tab->Binmode) {
1274 /* Has a handler - normal case */
1275 if ((*l->tab->Binmode)(aTHX_ f) == 0) {
1276 if (*t == l) {
1277 /* Layer still there - move down a layer */
1278 t = PerlIONext(t);
1279 }
1280 }
1281 else {
1282 return -1;
1283 }
14a5cf38
JH		 1284 }
1285 else {
86e05cf2
NIS		 1286 /* No handler - pop it */
1287 PerlIO_pop(aTHX_ t);
14a5cf38
JH		 1288 }
1289 }
86e05cf2
NIS		 1290 if (PerlIOValid(f)) {
1291 PerlIO_debug(":raw f=%p :%s\n", (void*)f, PerlIOBase(f)->tab->name);
1292 return 0;
1293 }
14a5cf38
JH		 1294 }
1295 return -1;
dfebf958
NIS		 1296}
1297
ac27b0f5 1298int
14a5cf38 1299PerlIO_apply_layera(pTHX_ PerlIO *f, const char *mode,
d9dac8cd 1300 PerlIO_list_t *layers, IV n, IV max)
14a5cf38 1301{
14a5cf38
JH		 1302 int code = 0;
1303 while (n < max) {
8772537c 1304 PerlIO_funcs * const tab = PerlIO_layer_fetch(aTHX_ layers, n, NULL);
14a5cf38
JH		 1305 if (tab) {
1306 if (!PerlIO_push(aTHX_ f, tab, mode, PerlIOArg)) {
1307 code = -1;
1308 break;
1309 }
1310 }
1311 n++;
1312 }
1313 return code;
e3f3bf95
NIS		 1314}
1315
1316int
ac27b0f5
NIS		 1317PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
1318{
14a5cf38 1319 int code = 0;
53f1b6d2 1320 if (f && names) {
8772537c 1321 PerlIO_list_t * const layers = PerlIO_list_alloc(aTHX);
14a5cf38
JH		 1322 code = PerlIO_parse_layers(aTHX_ layers, names);
1323 if (code == 0) {
d9dac8cd 1324 code = PerlIO_apply_layera(aTHX_ f, mode, layers, 0, layers->cur);
14a5cf38 1325 }
3a1ee7e8 1326 PerlIO_list_free(aTHX_ layers);
ac27b0f5 1327 }
14a5cf38 1328 return code;
ac27b0f5
NIS		 1329}
1330
f3862f8b 1331
60382766 1332/*--------------------------------------------------------------------------------------*/
14a5cf38 1333/*
71200d45 1334 * Given the abstraction above the public API functions
14a5cf38 1335 */
60382766
NIS		 1336
1337int
f5b9d040 1338PerlIO_binmode(pTHX_ PerlIO *f, int iotype, int mode, const char *names)
76ced9ad 1339{
68b5363f
PD		 1340 PerlIO_debug("PerlIO_binmode f=%p %s %c %x %s\n", (void*)f,
1341 (PerlIOBase(f)) ? PerlIOBase(f)->tab->name : "(Null)",
1342 iotype, mode, (names) ? names : "(Null)");
1343
03c0554d
NIS		 1344 if (names) {
1345 /* Do not flush etc. if (e.g.) switching encodings.
1346 if a pushed layer knows it needs to flush lower layers
1347 (for example :unix which is never going to call them)
1348 it can do the flush when it is pushed.
1349 */
1350 return PerlIO_apply_layers(aTHX_ f, NULL, names) == 0 ? TRUE : FALSE;
1351 }
1352 else {
86e05cf2 1353 /* Fake 5.6 legacy of using this call to turn ON O_TEXT */
35990314 1354#ifdef PERLIO_USING_CRLF
03c0554d
NIS		 1355 /* Legacy binmode only has meaning if O_TEXT has a value distinct from
1356 O_BINARY so we can look for it in mode.
1357 */
1358 if (!(mode & O_BINARY)) {
1359 /* Text mode */
86e05cf2
NIS		 1360 /* FIXME?: Looking down the layer stack seems wrong,
1361 but is a way of reaching past (say) an encoding layer
1362 to flip CRLF-ness of the layer(s) below
1363 */
03c0554d
NIS		 1364 while (*f) {
1365 /* Perhaps we should turn on bottom-most aware layer
1366 e.g. Ilya's idea that UNIX TTY could serve
1367 */
1368 if (PerlIOBase(f)->tab->kind & PERLIO_K_CANCRLF) {
1369 if (!(PerlIOBase(f)->flags & PERLIO_F_CRLF)) {
1370 /* Not in text mode - flush any pending stuff and flip it */
1371 PerlIO_flush(f);
1372 PerlIOBase(f)->flags |= PERLIO_F_CRLF;
1373 }
1374 /* Only need to turn it on in one layer so we are done */
1375 return TRUE;
ed53a2bb 1376 }
03c0554d 1377 f = PerlIONext(f);
14a5cf38 1378 }
03c0554d
NIS		 1379 /* Not finding a CRLF aware layer presumably means we are binary
1380 which is not what was requested - so we failed
1381 We _could_ push :crlf layer but so could caller
1382 */
1383 return FALSE;
14a5cf38 1384 }
6ce75a77 1385#endif
86e05cf2
NIS		 1386 /* Legacy binmode is now _defined_ as being equivalent to pushing :raw
1387 So code that used to be here is now in PerlIORaw_pushed().
03c0554d 1388 */
a0714e2c 1389 return PerlIO_push(aTHX_ f, PERLIO_FUNCS_CAST(&PerlIO_raw), NULL, NULL) ? TRUE : FALSE;
14a5cf38 1390 }
f5b9d040
NIS		 1391}
1392
f5b9d040 1393int
e87a358a 1394PerlIO__close(pTHX_ PerlIO *f)
f5b9d040 1395{
37725cdc 1396 if (PerlIOValid(f)) {
46c461b5 1397 PerlIO_funcs * const tab = PerlIOBase(f)->tab;
37725cdc
NIS		 1398 if (tab && tab->Close)
1399 return (*tab->Close)(aTHX_ f);
1400 else
1401 return PerlIOBase_close(aTHX_ f);
1402 }
14a5cf38 1403 else {
93189314 1404 SETERRNO(EBADF, SS_IVCHAN);
14a5cf38
JH		 1405 return -1;
1406 }
76ced9ad
NIS		 1407}
1408
b931b1d9 1409int
e87a358a 1410Perl_PerlIO_close(pTHX_ PerlIO *f)
b931b1d9 1411{
de009b76 1412 const int code = PerlIO__close(aTHX_ f);
37725cdc
NIS		 1413 while (PerlIOValid(f)) {
1414 PerlIO_pop(aTHX_ f);
f6c77cf1 1415 }
14a5cf38 1416 return code;
b931b1d9
NIS		 1417}
1418
b931b1d9 1419int
e87a358a 1420Perl_PerlIO_fileno(pTHX_ PerlIO *f)
b931b1d9 1421{
97aff369 1422 dVAR;
b32dd47e 1423 Perl_PerlIO_or_Base(f, Fileno, fileno, -1, (aTHX_ f));
b931b1d9
NIS		 1424}
1425
1141d9f8 1426
fcf2db38 1427static PerlIO_funcs *
2edd7e44
NIS		 1428PerlIO_layer_from_ref(pTHX_ SV *sv)
1429{
97aff369 1430 dVAR;
14a5cf38 1431 /*
71200d45 1432 * For any scalar type load the handler which is bundled with perl
14a5cf38
JH		 1433 */
1434 if (SvTYPE(sv) < SVt_PVAV)
6a245ed1 1435 return PerlIO_find_layer(aTHX_ STR_WITH_LEN("scalar"), 1);
14a5cf38
JH		 1436
1437 /*
71200d45 1438 * For other types allow if layer is known but don't try and load it
14a5cf38
JH		 1439 */
1440 switch (SvTYPE(sv)) {
1441 case SVt_PVAV:
6a245ed1 1442 return PerlIO_find_layer(aTHX_ STR_WITH_LEN("Array"), 0);
14a5cf38 1443 case SVt_PVHV:
6a245ed1 1444 return PerlIO_find_layer(aTHX_ STR_WITH_LEN("Hash"), 0);
14a5cf38 1445 case SVt_PVCV:
6a245ed1 1446 return PerlIO_find_layer(aTHX_ STR_WITH_LEN("Code"), 0);
14a5cf38 1447 case SVt_PVGV:
6a245ed1 1448 return PerlIO_find_layer(aTHX_ STR_WITH_LEN("Glob"), 0);
42d0e0b7
AL		 1449 default:
1450 return NULL;
14a5cf38 1451 }
2edd7e44
NIS		 1452}
1453
fcf2db38 1454PerlIO_list_t *
14a5cf38
JH		 1455PerlIO_resolve_layers(pTHX_ const char *layers,
1456 const char *mode, int narg, SV **args)
1457{
97aff369 1458 dVAR;
14a5cf38
JH		 1459 PerlIO_list_t *def = PerlIO_default_layers(aTHX);
1460 int incdef = 1;
a1ea730d 1461 if (!PL_perlio)
14a5cf38
JH		 1462 PerlIO_stdstreams(aTHX);
1463 if (narg) {
dcda55fc 1464 SV * const arg = *args;
14a5cf38 1465 /*
71200d45
NIS		 1466 * If it is a reference but not an object see if we have a handler
1467 * for it
14a5cf38
JH		 1468 */
1469 if (SvROK(arg) && !sv_isobject(arg)) {
46c461b5 1470 PerlIO_funcs * const handler = PerlIO_layer_from_ref(aTHX_ SvRV(arg));
14a5cf38 1471 if (handler) {
3a1ee7e8
NIS		 1472 def = PerlIO_list_alloc(aTHX);
1473 PerlIO_list_push(aTHX_ def, handler, &PL_sv_undef);
14a5cf38
JH		 1474 incdef = 0;
1475 }
1476 /*
e934609f 1477 * Don't fail if handler cannot be found :via(...) etc. may do
14a5cf38 1478 * something sensible else we will just stringfy and open
71200d45 1479 * resulting string.
14a5cf38
JH		 1480 */
1481 }
1482 }
9fe371da 1483 if (!layers || !*layers)
11bcd5da 1484 layers = Perl_PerlIO_context_layers(aTHX_ mode);
14a5cf38
JH		 1485 if (layers && *layers) {
1486 PerlIO_list_t *av;
1487 if (incdef) {
de009b76 1488 IV i;
3a1ee7e8 1489 av = PerlIO_list_alloc(aTHX);
14a5cf38 1490 for (i = 0; i < def->cur; i++) {
3a1ee7e8 1491 PerlIO_list_push(aTHX_ av, def->array[i].funcs,
14a5cf38
JH		 1492 def->array[i].arg);
1493 }
1494 }
1495 else {
1496 av = def;
1497 }
0cff2cf3
NIS		 1498 if (PerlIO_parse_layers(aTHX_ av, layers) == 0) {
1499 return av;
1500 }
1501 else {
1502 PerlIO_list_free(aTHX_ av);
b37c2d43 1503 return NULL;
0cff2cf3 1504 }
14a5cf38
JH		 1505 }
1506 else {
1507 if (incdef)
1508 def->refcnt++;
1509 return def;
1510 }
ee518936
NIS		 1511}
1512
1513PerlIO *
14a5cf38
JH		 1514PerlIO_openn(pTHX_ const char *layers, const char *mode, int fd,
1515 int imode, int perm, PerlIO *f, int narg, SV **args)
1516{
97aff369 1517 dVAR;
14a5cf38
JH		 1518 if (!f && narg == 1 && *args == &PL_sv_undef) {
1519 if ((f = PerlIO_tmpfile())) {
9fe371da 1520 if (!layers || !*layers)
11bcd5da 1521 layers = Perl_PerlIO_context_layers(aTHX_ mode);
14a5cf38
JH		 1522 if (layers && *layers)
1523 PerlIO_apply_layers(aTHX_ f, mode, layers);
1524 }
1525 }
1526 else {
de009b76 1527 PerlIO_list_t *layera;
14a5cf38
JH		 1528 IV n;
1529 PerlIO_funcs *tab = NULL;
04892f78 1530 if (PerlIOValid(f)) {
14a5cf38 1531 /*
71200d45
NIS		 1532 * This is "reopen" - it is not tested as perl does not use it
1533 * yet
14a5cf38
JH		 1534 */
1535 PerlIOl *l = *f;
3a1ee7e8 1536 layera = PerlIO_list_alloc(aTHX);
14a5cf38 1537 while (l) {
46c461b5 1538 SV * const arg = (l->tab->Getarg)
04892f78
NIS		 1539 ? (*l->tab->Getarg) (aTHX_ &l, NULL, 0)
1540 : &PL_sv_undef;
3a1ee7e8 1541 PerlIO_list_push(aTHX_ layera, l->tab, arg);
14a5cf38
JH		 1542 l = *PerlIONext(&l);
1543 }
1544 }
1545 else {
1546 layera = PerlIO_resolve_layers(aTHX_ layers, mode, narg, args);
0cff2cf3
NIS		 1547 if (!layera) {
1548 return NULL;
1549 }
14a5cf38
JH		 1550 }
1551 /*
71200d45 1552 * Start at "top" of layer stack
14a5cf38
JH		 1553 */
1554 n = layera->cur - 1;
1555 while (n >= 0) {
46c461b5 1556 PerlIO_funcs * const t = PerlIO_layer_fetch(aTHX_ layera, n, NULL);
14a5cf38
JH		 1557 if (t && t->Open) {
1558 tab = t;
1559 break;
1560 }
1561 n--;
1562 }
1563 if (tab) {
1564 /*
71200d45 1565 * Found that layer 'n' can do opens - call it
14a5cf38 1566 */
7cf31beb 1567 if (narg > 1 && !(tab->kind & PERLIO_K_MULTIARG)) {
3b8752bb 1568 Perl_croak(aTHX_ "More than one argument to open(,':%s')",tab->name);
7cf31beb 1569 }
14a5cf38 1570 PerlIO_debug("openn(%s,'%s','%s',%d,%x,%o,%p,%d,%p)\n",
355d3743
PD		 1571 tab->name, layers ? layers : "(Null)", mode, fd,
1572 imode, perm, (void*)f, narg, (void*)args);
210e727c
JH		 1573 if (tab->Open)
1574 f = (*tab->Open) (aTHX_ tab, layera, n, mode, fd, imode, perm,
1575 f, narg, args);
1576 else {
1577 SETERRNO(EINVAL, LIB_INVARG);
1578 f = NULL;
1579 }
14a5cf38
JH		 1580 if (f) {
1581 if (n + 1 < layera->cur) {
1582 /*
1583 * More layers above the one that we used to open -
71200d45 1584 * apply them now
14a5cf38 1585 */
d9dac8cd
NIS		 1586 if (PerlIO_apply_layera(aTHX_ f, mode, layera, n + 1, layera->cur) != 0) {
1587 /* If pushing layers fails close the file */
1588 PerlIO_close(f);
14a5cf38
JH		 1589 f = NULL;
1590 }
1591 }
1592 }
1593 }
3a1ee7e8 1594 PerlIO_list_free(aTHX_ layera);
14a5cf38
JH		 1595 }
1596 return f;
ee518936 1597}
b931b1d9
NIS		 1598
1599
9e353e3b 1600SSize_t
e87a358a 1601Perl_PerlIO_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
6f9d8c32 1602{
b32dd47e 1603 Perl_PerlIO_or_Base(f, Read, read, -1, (aTHX_ f, vbuf, count));
760ac839
LW		 1604}
1605
313ca112 1606SSize_t
e87a358a 1607Perl_PerlIO_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
760ac839 1608{
b32dd47e 1609 Perl_PerlIO_or_Base(f, Unread, unread, -1, (aTHX_ f, vbuf, count));
760ac839
LW		 1610}
1611
9e353e3b 1612SSize_t
e87a358a 1613Perl_PerlIO_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
760ac839 1614{
b32dd47e 1615 Perl_PerlIO_or_fail(f, Write, -1, (aTHX_ f, vbuf, count));
760ac839
LW		 1616}
1617
6f9d8c32 1618int
e87a358a 1619Perl_PerlIO_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
760ac839 1620{
b32dd47e 1621 Perl_PerlIO_or_fail(f, Seek, -1, (aTHX_ f, offset, whence));
760ac839
LW		 1622}
1623
9e353e3b 1624Off_t
e87a358a 1625Perl_PerlIO_tell(pTHX_ PerlIO *f)
760ac839 1626{
b32dd47e 1627 Perl_PerlIO_or_fail(f, Tell, -1, (aTHX_ f));
760ac839
LW		 1628}
1629
6f9d8c32 1630int
e87a358a 1631Perl_PerlIO_flush(pTHX_ PerlIO *f)
760ac839 1632{
97aff369 1633 dVAR;
14a5cf38
JH		 1634 if (f) {
1635 if (*f) {
de009b76 1636 const PerlIO_funcs *tab = PerlIOBase(f)->tab;
1b7a0411
JH		 1637
1638 if (tab && tab->Flush)
f62ce20a 1639 return (*tab->Flush) (aTHX_ f);
1b7a0411
JH		 1640 else
1641 return 0; /* If no Flush defined, silently succeed. */
14a5cf38
JH		 1642 }
1643 else {
fe5a182c 1644 PerlIO_debug("Cannot flush f=%p\n", (void*)f);
93189314 1645 SETERRNO(EBADF, SS_IVCHAN);
14a5cf38
JH		 1646 return -1;
1647 }
1648 }
1649 else {
1650 /*
1651 * Is it good API design to do flush-all on NULL, a potentially
1652 * errorneous input? Maybe some magical value (PerlIO*
1653 * PERLIO_FLUSH_ALL = (PerlIO*)-1;)? Yes, stdio does similar
1654 * things on fflush(NULL), but should we be bound by their design
71200d45 1655 * decisions? --jhi
14a5cf38 1656 */
a1ea730d 1657 PerlIO **table = &PL_perlio;
14a5cf38
JH		 1658 int code = 0;
1659 while ((f = *table)) {
1660 int i;
1661 table = (PerlIO **) (f++);
1662 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
1663 if (*f && PerlIO_flush(f) != 0)
1664 code = -1;
1665 f++;
1666 }
1667 }
1668 return code;
1669 }
760ac839
LW		 1670}
1671
a9c883f6 1672void
f62ce20a 1673PerlIOBase_flush_linebuf(pTHX)
a9c883f6 1674{
97aff369 1675 dVAR;
a1ea730d 1676 PerlIO **table = &PL_perlio;
14a5cf38
JH		 1677 PerlIO *f;
1678 while ((f = *table)) {
1679 int i;
1680 table = (PerlIO **) (f++);
1681 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
1682 if (*f
1683 && (PerlIOBase(f)->
1684 flags & (PERLIO_F_LINEBUF | PERLIO_F_CANWRITE))
1685 == (PERLIO_F_LINEBUF | PERLIO_F_CANWRITE))
1686 PerlIO_flush(f);
1687 f++;
1688 }
a9c883f6 1689 }
a9c883f6
NIS		 1690}
1691
06da4f11 1692int
e87a358a 1693Perl_PerlIO_fill(pTHX_ PerlIO *f)
06da4f11 1694{
b32dd47e 1695 Perl_PerlIO_or_fail(f, Fill, -1, (aTHX_ f));
06da4f11
NIS		 1696}
1697
f3862f8b
NIS		 1698int
1699PerlIO_isutf8(PerlIO *f)
1700{
1b7a0411
JH		 1701 if (PerlIOValid(f))
1702 return (PerlIOBase(f)->flags & PERLIO_F_UTF8) != 0;
1703 else
1704 SETERRNO(EBADF, SS_IVCHAN);
37725cdc 1705
1b7a0411 1706 return -1;
f3862f8b
NIS		 1707}
1708
6f9d8c32 1709int
e87a358a 1710Perl_PerlIO_eof(pTHX_ PerlIO *f)
760ac839 1711{
b32dd47e 1712 Perl_PerlIO_or_Base(f, Eof, eof, -1, (aTHX_ f));
9e353e3b
NIS		 1713}
1714
9e353e3b 1715int
e87a358a 1716Perl_PerlIO_error(pTHX_ PerlIO *f)
9e353e3b 1717{
b32dd47e 1718 Perl_PerlIO_or_Base(f, Error, error, -1, (aTHX_ f));
9e353e3b
NIS		 1719}
1720
9e353e3b 1721void
e87a358a 1722Perl_PerlIO_clearerr(pTHX_ PerlIO *f)
9e353e3b 1723{
b32dd47e 1724 Perl_PerlIO_or_Base_void(f, Clearerr, clearerr, (aTHX_ f));
9e353e3b
NIS		 1725}
1726
9e353e3b 1727void
e87a358a 1728Perl_PerlIO_setlinebuf(pTHX_ PerlIO *f)
9e353e3b 1729{
b32dd47e 1730 Perl_PerlIO_or_Base_void(f, Setlinebuf, setlinebuf, (aTHX_ f));
9e353e3b
NIS		 1731}
1732
9e353e3b
NIS		 1733int
1734PerlIO_has_base(PerlIO *f)
1735{
1b7a0411 1736 if (PerlIOValid(f)) {
46c461b5 1737 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
1b7a0411
JH		 1738
1739 if (tab)
1740 return (tab->Get_base != NULL);
1741 SETERRNO(EINVAL, LIB_INVARG);
1742 }
1743 else
1744 SETERRNO(EBADF, SS_IVCHAN);
1745
1746 return 0;
760ac839
LW		 1747}
1748
9e353e3b
NIS		 1749int
1750PerlIO_fast_gets(PerlIO *f)
760ac839 1751{
04892f78 1752 if (PerlIOValid(f) && (PerlIOBase(f)->flags & PERLIO_F_FASTGETS)) {
46c461b5 1753 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
1b7a0411
JH		 1754
1755 if (tab)
1756 return (tab->Set_ptrcnt != NULL);
1757 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38 1758 }
1b7a0411
JH		 1759 else
1760 SETERRNO(EBADF, SS_IVCHAN);
1761
14a5cf38 1762 return 0;
9e353e3b
NIS		 1763}
1764
9e353e3b
NIS		 1765int
1766PerlIO_has_cntptr(PerlIO *f)
1767{
04892f78 1768 if (PerlIOValid(f)) {
46c461b5 1769 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
1b7a0411
JH		 1770
1771 if (tab)
1772 return (tab->Get_ptr != NULL && tab->Get_cnt != NULL);
1773 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38 1774 }
1b7a0411
JH		 1775 else
1776 SETERRNO(EBADF, SS_IVCHAN);
1777
14a5cf38 1778 return 0;
9e353e3b
NIS		 1779}
1780
9e353e3b
NIS		 1781int
1782PerlIO_canset_cnt(PerlIO *f)
1783{
04892f78 1784 if (PerlIOValid(f)) {
46c461b5 1785 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
1b7a0411
JH		 1786
1787 if (tab)
1788 return (tab->Set_ptrcnt != NULL);
1789 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38 1790 }
1b7a0411
JH		 1791 else
1792 SETERRNO(EBADF, SS_IVCHAN);
1793
14a5cf38 1794 return 0;
760ac839
LW		 1795}
1796
888911fc 1797STDCHAR *
e87a358a 1798Perl_PerlIO_get_base(pTHX_ PerlIO *f)
760ac839 1799{
b32dd47e 1800 Perl_PerlIO_or_fail(f, Get_base, NULL, (aTHX_ f));
9e353e3b
NIS		 1801}
1802
9e353e3b 1803int
e87a358a 1804Perl_PerlIO_get_bufsiz(pTHX_ PerlIO *f)
9e353e3b 1805{
b32dd47e 1806 Perl_PerlIO_or_fail(f, Get_bufsiz, -1, (aTHX_ f));
9e353e3b
NIS		 1807}
1808
9e353e3b 1809STDCHAR *
e87a358a 1810Perl_PerlIO_get_ptr(pTHX_ PerlIO *f)
9e353e3b 1811{
b32dd47e 1812 Perl_PerlIO_or_fail(f, Get_ptr, NULL, (aTHX_ f));
9e353e3b
NIS		 1813}
1814
05d1247b 1815int
e87a358a 1816Perl_PerlIO_get_cnt(pTHX_ PerlIO *f)
9e353e3b 1817{
b32dd47e 1818 Perl_PerlIO_or_fail(f, Get_cnt, -1, (aTHX_ f));
9e353e3b
NIS		 1819}
1820
9e353e3b 1821void
e87a358a 1822Perl_PerlIO_set_cnt(pTHX_ PerlIO *f, int cnt)
9e353e3b 1823{
b32dd47e 1824 Perl_PerlIO_or_fail_void(f, Set_ptrcnt, (aTHX_ f, NULL, cnt));
9e353e3b
NIS		 1825}
1826
9e353e3b 1827void
e87a358a 1828Perl_PerlIO_set_ptrcnt(pTHX_ PerlIO *f, STDCHAR * ptr, int cnt)
9e353e3b 1829{
b32dd47e 1830 Perl_PerlIO_or_fail_void(f, Set_ptrcnt, (aTHX_ f, ptr, cnt));
9e353e3b
NIS		 1831}
1832
4ec2216f 1833
9e353e3b 1834/*--------------------------------------------------------------------------------------*/
14a5cf38 1835/*
71200d45 1836 * utf8 and raw dummy layers
14a5cf38 1837 */
dfebf958 1838
26fb694e 1839IV
2dc2558e 1840PerlIOUtf8_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
26fb694e 1841{
96a5add6 1842 PERL_UNUSED_CONTEXT;
8772537c
AL		 1843 PERL_UNUSED_ARG(mode);
1844 PERL_UNUSED_ARG(arg);
00f51856 1845 if (PerlIOValid(f)) {
14a5cf38
JH		 1846 if (tab->kind & PERLIO_K_UTF8)
1847 PerlIOBase(f)->flags |= PERLIO_F_UTF8;
1848 else
1849 PerlIOBase(f)->flags &= ~PERLIO_F_UTF8;
1850 return 0;
1851 }
1852 return -1;
26fb694e
NIS		 1853}
1854
27da23d5 1855PERLIO_FUNCS_DECL(PerlIO_utf8) = {
2dc2558e 1856 sizeof(PerlIO_funcs),
14a5cf38 1857 "utf8",
2dc2558e 1858 0,
6874a2de 1859 PERLIO_K_DUMMY | PERLIO_K_UTF8,
14a5cf38
JH		 1860 PerlIOUtf8_pushed,
1861 NULL,
1862 NULL,
1863 NULL,
1864 NULL,
1865 NULL,
1866 NULL,
1867 NULL,
1868 NULL,
1869 NULL,
1870 NULL,
de009b76
AL		 1871 NULL,
1872 NULL,
22569500
NIS		 1873 NULL, /* flush */
1874 NULL, /* fill */
14a5cf38
JH		 1875 NULL,
1876 NULL,
1877 NULL,
1878 NULL,
22569500
NIS		 1879 NULL, /* get_base */
1880 NULL, /* get_bufsiz */
1881 NULL, /* get_ptr */
1882 NULL, /* get_cnt */
1883 NULL, /* set_ptrcnt */
26fb694e
NIS		 1884};
1885
27da23d5 1886PERLIO_FUNCS_DECL(PerlIO_byte) = {
2dc2558e 1887 sizeof(PerlIO_funcs),
14a5cf38 1888 "bytes",
2dc2558e 1889 0,
14a5cf38
JH		 1890 PERLIO_K_DUMMY,
1891 PerlIOUtf8_pushed,
1892 NULL,
1893 NULL,
1894 NULL,
1895 NULL,
1896 NULL,
1897 NULL,
1898 NULL,
1899 NULL,
1900 NULL,
1901 NULL,
de009b76
AL		 1902 NULL,
1903 NULL,
22569500
NIS		 1904 NULL, /* flush */
1905 NULL, /* fill */
14a5cf38
JH		 1906 NULL,
1907 NULL,
1908 NULL,
1909 NULL,
22569500
NIS		 1910 NULL, /* get_base */
1911 NULL, /* get_bufsiz */
1912 NULL, /* get_ptr */
1913 NULL, /* get_cnt */
1914 NULL, /* set_ptrcnt */
dfebf958
NIS		 1915};
1916
1917PerlIO *
14a5cf38
JH		 1918PerlIORaw_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers,
1919 IV n, const char *mode, int fd, int imode, int perm,
1920 PerlIO *old, int narg, SV **args)
dfebf958 1921{
8772537c
AL		 1922 PerlIO_funcs * const tab = PerlIO_default_btm();
1923 PERL_UNUSED_ARG(self);
210e727c
JH		 1924 if (tab && tab->Open)
1925 return (*tab->Open) (aTHX_ tab, layers, n - 1, mode, fd, imode, perm,
1926 old, narg, args);
1927 SETERRNO(EINVAL, LIB_INVARG);
1928 return NULL;
dfebf958
NIS		 1929}
1930
27da23d5 1931PERLIO_FUNCS_DECL(PerlIO_raw) = {
2dc2558e 1932 sizeof(PerlIO_funcs),
14a5cf38 1933 "raw",
2dc2558e 1934 0,
14a5cf38
JH		 1935 PERLIO_K_DUMMY,
1936 PerlIORaw_pushed,
1937 PerlIOBase_popped,
1938 PerlIORaw_open,
1939 NULL,
1940 NULL,
1941 NULL,
1942 NULL,
1943 NULL,
1944 NULL,
1945 NULL,
1946 NULL,
de009b76
AL		 1947 NULL,
1948 NULL,
22569500
NIS		 1949 NULL, /* flush */
1950 NULL, /* fill */
14a5cf38
JH		 1951 NULL,
1952 NULL,
1953 NULL,
1954 NULL,
22569500
NIS		 1955 NULL, /* get_base */
1956 NULL, /* get_bufsiz */
1957 NULL, /* get_ptr */
1958 NULL, /* get_cnt */
1959 NULL, /* set_ptrcnt */
dfebf958
NIS		 1960};
1961/*--------------------------------------------------------------------------------------*/
1962/*--------------------------------------------------------------------------------------*/
14a5cf38 1963/*
71200d45 1964 * "Methods" of the "base class"
14a5cf38 1965 */
9e353e3b
NIS		 1966
1967IV
f62ce20a 1968PerlIOBase_fileno(pTHX_ PerlIO *f)
9e353e3b 1969{
04892f78 1970 return PerlIOValid(f) ? PerlIO_fileno(PerlIONext(f)) : -1;
9e353e3b
NIS		 1971}
1972
f5b9d040 1973char *
81428673 1974PerlIO_modestr(PerlIO * f, char *buf)
14a5cf38
JH		 1975{
1976 char *s = buf;
81428673 1977 if (PerlIOValid(f)) {
de009b76 1978 const IV flags = PerlIOBase(f)->flags;
81428673
NIS		 1979 if (flags & PERLIO_F_APPEND) {
1980 *s++ = 'a';
1981 if (flags & PERLIO_F_CANREAD) {
1982 *s++ = '+';
1983 }
14a5cf38 1984 }
81428673
NIS		 1985 else if (flags & PERLIO_F_CANREAD) {
1986 *s++ = 'r';
1987 if (flags & PERLIO_F_CANWRITE)
1988 *s++ = '+';
1989 }
1990 else if (flags & PERLIO_F_CANWRITE) {
1991 *s++ = 'w';
1992 if (flags & PERLIO_F_CANREAD) {
1993 *s++ = '+';
1994 }
14a5cf38 1995 }
35990314 1996#ifdef PERLIO_USING_CRLF
81428673
NIS		 1997 if (!(flags & PERLIO_F_CRLF))
1998 *s++ = 'b';
5f1a76d0 1999#endif
81428673 2000 }
14a5cf38
JH		 2001 *s = '\0';
2002 return buf;
f5b9d040
NIS		 2003}
2004
81428673 2005
76ced9ad 2006IV
2dc2558e 2007PerlIOBase_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
9e353e3b 2008{
de009b76 2009 PerlIOl * const l = PerlIOBase(f);
96a5add6 2010 PERL_UNUSED_CONTEXT;
8772537c 2011 PERL_UNUSED_ARG(arg);
de009b76 2012
14a5cf38
JH		 2013 l->flags &= ~(PERLIO_F_CANREAD | PERLIO_F_CANWRITE |
2014 PERLIO_F_TRUNCATE | PERLIO_F_APPEND);
2015 if (tab->Set_ptrcnt != NULL)
2016 l->flags |= PERLIO_F_FASTGETS;
2017 if (mode) {
3b6c1aba 2018 if (*mode == IoTYPE_NUMERIC || *mode == IoTYPE_IMPLICIT)
14a5cf38
JH		 2019 mode++;
2020 switch (*mode++) {
2021 case 'r':
2022 l->flags |= PERLIO_F_CANREAD;
2023 break;
2024 case 'a':
2025 l->flags |= PERLIO_F_APPEND | PERLIO_F_CANWRITE;
2026 break;
2027 case 'w':
2028 l->flags |= PERLIO_F_TRUNCATE | PERLIO_F_CANWRITE;
2029 break;
2030 default:
93189314 2031 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH		 2032 return -1;
2033 }
2034 while (*mode) {
2035 switch (*mode++) {
2036 case '+':
2037 l->flags |= PERLIO_F_CANREAD | PERLIO_F_CANWRITE;
2038 break;
2039 case 'b':
2040 l->flags &= ~PERLIO_F_CRLF;
2041 break;
2042 case 't':
2043 l->flags |= PERLIO_F_CRLF;
2044 break;
2045 default:
93189314 2046 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH		 2047 return -1;
2048 }
2049 }
2050 }
2051 else {
2052 if (l->next) {
2053 l->flags |= l->next->flags &
2054 (PERLIO_F_CANREAD | PERLIO_F_CANWRITE | PERLIO_F_TRUNCATE |
2055 PERLIO_F_APPEND);
2056 }
2057 }
5e2ab84b 2058#if 0
14a5cf38
JH		 2059 PerlIO_debug("PerlIOBase_pushed f=%p %s %s fl=%08" UVxf " (%s)\n",
2060 f, PerlIOBase(f)->tab->name, (omode) ? omode : "(Null)",
2061 l->flags, PerlIO_modestr(f, temp));
5e2ab84b 2062#endif
14a5cf38 2063 return 0;
76ced9ad
NIS		 2064}
2065
2066IV
f62ce20a 2067PerlIOBase_popped(pTHX_ PerlIO *f)
76ced9ad 2068{
96a5add6 2069 PERL_UNUSED_CONTEXT;
8772537c 2070 PERL_UNUSED_ARG(f);
14a5cf38 2071 return 0;
760ac839
LW		 2072}
2073
9e353e3b 2074SSize_t
f62ce20a 2075PerlIOBase_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 2076{
14a5cf38 2077 /*
71200d45 2078 * Save the position as current head considers it
14a5cf38 2079 */
de009b76 2080 const Off_t old = PerlIO_tell(f);
a0714e2c 2081 PerlIO_push(aTHX_ f, PERLIO_FUNCS_CAST(&PerlIO_pending), "r", NULL);
14a5cf38 2082 PerlIOSelf(f, PerlIOBuf)->posn = old;
de009b76 2083 return PerlIOBuf_unread(aTHX_ f, vbuf, count);
9e353e3b
NIS		 2084}
2085
f6c77cf1 2086SSize_t
f62ce20a 2087PerlIOBase_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
f6c77cf1 2088{
14a5cf38
JH		 2089 STDCHAR *buf = (STDCHAR *) vbuf;
2090 if (f) {
263df5f1
JH		 2091 if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD)) {
2092 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
2093 SETERRNO(EBADF, SS_IVCHAN);
2094 return 0;
2095 }
14a5cf38 2096 while (count > 0) {
93c2c2ec
IZ		 2097 get_cnt:
2098 {
14a5cf38
JH		 2099 SSize_t avail = PerlIO_get_cnt(f);
2100 SSize_t take = 0;
2101 if (avail > 0)
bb7a0f54 2102 take = ((SSize_t)count < avail) ? (SSize_t)count : avail;
14a5cf38
JH		 2103 if (take > 0) {
2104 STDCHAR *ptr = PerlIO_get_ptr(f);
2105 Copy(ptr, buf, take, STDCHAR);
2106 PerlIO_set_ptrcnt(f, ptr + take, (avail -= take));
2107 count -= take;
2108 buf += take;
93c2c2ec
IZ		 2109 if (avail == 0) /* set_ptrcnt could have reset avail */
2110 goto get_cnt;
14a5cf38
JH		 2111 }
2112 if (count > 0 && avail <= 0) {
2113 if (PerlIO_fill(f) != 0)
2114 break;
2115 }
93c2c2ec 2116 }
14a5cf38
JH		 2117 }
2118 return (buf - (STDCHAR *) vbuf);
2119 }
f6c77cf1 2120 return 0;
f6c77cf1
NIS		 2121}
2122
9e353e3b 2123IV
f62ce20a 2124PerlIOBase_noop_ok(pTHX_ PerlIO *f)
9e353e3b 2125{
96a5add6 2126 PERL_UNUSED_CONTEXT;
8772537c 2127 PERL_UNUSED_ARG(f);
14a5cf38 2128 return 0;
9e353e3b
NIS		 2129}
2130
2131IV
f62ce20a 2132PerlIOBase_noop_fail(pTHX_ PerlIO *f)
06da4f11 2133{
96a5add6 2134 PERL_UNUSED_CONTEXT;
8772537c 2135 PERL_UNUSED_ARG(f);
14a5cf38 2136 return -1;
06da4f11
NIS		 2137}
2138
2139IV
f62ce20a 2140PerlIOBase_close(pTHX_ PerlIO *f)
9e353e3b 2141{
37725cdc
NIS		 2142 IV code = -1;
2143 if (PerlIOValid(f)) {
2144 PerlIO *n = PerlIONext(f);
2145 code = PerlIO_flush(f);
2146 PerlIOBase(f)->flags &=
2147 ~(PERLIO_F_CANREAD | PERLIO_F_CANWRITE | PERLIO_F_OPEN);
2148 while (PerlIOValid(n)) {
de009b76 2149 const PerlIO_funcs * const tab = PerlIOBase(n)->tab;
37725cdc
NIS		 2150 if (tab && tab->Close) {
2151 if ((*tab->Close)(aTHX_ n) != 0)
2152 code = -1;
2153 break;
2154 }
2155 else {
2156 PerlIOBase(n)->flags &=
2157 ~(PERLIO_F_CANREAD | PERLIO_F_CANWRITE | PERLIO_F_OPEN);
2158 }
2159 n = PerlIONext(n);
2160 }
2161 }
2162 else {
2163 SETERRNO(EBADF, SS_IVCHAN);
2164 }
14a5cf38 2165 return code;
9e353e3b
NIS		 2166}
2167
2168IV
f62ce20a 2169PerlIOBase_eof(pTHX_ PerlIO *f)
9e353e3b 2170{
96a5add6 2171 PERL_UNUSED_CONTEXT;
04892f78 2172 if (PerlIOValid(f)) {
14a5cf38
JH		 2173 return (PerlIOBase(f)->flags & PERLIO_F_EOF) != 0;
2174 }
2175 return 1;
9e353e3b
NIS		 2176}
2177
2178IV
f62ce20a 2179PerlIOBase_error(pTHX_ PerlIO *f)
9e353e3b 2180{
96a5add6 2181 PERL_UNUSED_CONTEXT;
04892f78 2182 if (PerlIOValid(f)) {
14a5cf38
JH		 2183 return (PerlIOBase(f)->flags & PERLIO_F_ERROR) != 0;
2184 }
2185 return 1;
9e353e3b
NIS		 2186}
2187
2188void
f62ce20a 2189PerlIOBase_clearerr(pTHX_ PerlIO *f)
9e353e3b 2190{
04892f78 2191 if (PerlIOValid(f)) {
dcda55fc 2192 PerlIO * const n = PerlIONext(f);
14a5cf38 2193 PerlIOBase(f)->flags &= ~(PERLIO_F_ERROR | PERLIO_F_EOF);
04892f78 2194 if (PerlIOValid(n))
14a5cf38
JH		 2195 PerlIO_clearerr(n);
2196 }
9e353e3b
NIS		 2197}
2198
2199void
f62ce20a 2200PerlIOBase_setlinebuf(pTHX_ PerlIO *f)
9e353e3b 2201{
96a5add6 2202 PERL_UNUSED_CONTEXT;
04892f78 2203 if (PerlIOValid(f)) {
14a5cf38
JH		 2204 PerlIOBase(f)->flags |= PERLIO_F_LINEBUF;
2205 }
9e353e3b
NIS		 2206}
2207
93a8090d
NIS		 2208SV *
2209PerlIO_sv_dup(pTHX_ SV *arg, CLONE_PARAMS *param)
2210{
2211 if (!arg)
a0714e2c 2212 return NULL;
93a8090d
NIS		 2213#ifdef sv_dup
2214 if (param) {
2215 return sv_dup(arg, param);
2216 }
2217 else {
2218 return newSVsv(arg);
2219 }
2220#else
1b6737cc 2221 PERL_UNUSED_ARG(param);
93a8090d
NIS		 2222 return newSVsv(arg);
2223#endif
2224}
2225
2226PerlIO *
ecdeb87c 2227PerlIOBase_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
93a8090d 2228{
1b6737cc 2229 PerlIO * const nexto = PerlIONext(o);
04892f78 2230 if (PerlIOValid(nexto)) {
de009b76 2231 const PerlIO_funcs * const tab = PerlIOBase(nexto)->tab;
37725cdc
NIS		 2232 if (tab && tab->Dup)
2233 f = (*tab->Dup)(aTHX_ f, nexto, param, flags);
2234 else
2235 f = PerlIOBase_dup(aTHX_ f, nexto, param, flags);
93a8090d
NIS		 2236 }
2237 if (f) {
dcda55fc 2238 PerlIO_funcs * const self = PerlIOBase(o)->tab;
210e727c 2239 SV *arg;
93a8090d 2240 char buf[8];
fe5a182c
JH		 2241 PerlIO_debug("PerlIOBase_dup %s f=%p o=%p param=%p\n",
2242 self->name, (void*)f, (void*)o, (void*)param);
210e727c
JH		 2243 if (self->Getarg)
2244 arg = (*self->Getarg)(aTHX_ o, param, flags);
2245 else {
a0714e2c 2246 arg = NULL;
93a8090d
NIS		 2247 }
2248 f = PerlIO_push(aTHX_ f, self, PerlIO_modestr(o,buf), arg);
ecdeb87c 2249 if (arg) {
93a8090d
NIS		 2250 SvREFCNT_dec(arg);
2251 }
2252 }
2253 return f;
2254}
2255
27da23d5 2256/* PL_perlio_fd_refcnt[] is in intrpvar.h */
93a8090d 2257
6cb8cb21 2258/* Must be called with PL_perlio_mutex locked (if under 5.005 threads). */
22c96fc1
NC		 2259static void
2260S_more_refcounted_fds(pTHX_ const int new_fd) {
7a89be66 2261 dVAR;
22c96fc1 2262 const int old_max = PL_perlio_fd_refcnt_size;
f4ae5be6 2263 const int new_max = 16 + (new_fd & ~15);
22c96fc1
NC		 2264 int *new_array;
2265
2266 PerlIO_debug("More fds - old=%d, need %d, new=%d\n",
2267 old_max, new_fd, new_max);
2268
2269 if (new_fd < old_max) {
2270 return;
2271 }
2272
f4ae5be6
NC		 2273 assert (new_max > new_fd);
2274
10edeb5d
JH		 2275 new_array =
2276 (int*) PerlMemShared_realloc(PL_perlio_fd_refcnt, new_max * sizeof(int));
22c96fc1
NC		 2277
2278 if (!new_array) {
2279#ifdef USE_THREADS
6cb8cb21 2280 MUTEX_UNLOCK(&PL_perlio_mutex);
22c96fc1
NC		 2281#endif
2282 /* Can't use PerlIO to write as it allocates memory */
2283 PerlLIO_write(PerlIO_fileno(Perl_error_log),
2284 PL_no_mem, strlen(PL_no_mem));
2285 my_exit(1);
2286 }
2287
2288 PL_perlio_fd_refcnt_size = new_max;
2289 PL_perlio_fd_refcnt = new_array;
2290
95b63a38
JH		 2291 PerlIO_debug("Zeroing %p, %d\n",
2292 (void*)(new_array + old_max),
2293 new_max - old_max);
22c96fc1
NC		 2294
2295 Zero(new_array + old_max, new_max - old_max, int);
2296}
2297
2298
93a8090d
NIS		 2299void
2300PerlIO_init(pTHX)
2301{
2302 /* Place holder for stdstreams call ??? */
168d5872 2303#ifdef USE_THREADS
6cb8cb21 2304 MUTEX_INIT(&PL_perlio_mutex);
96a5add6
AL		 2305#else
2306 PERL_UNUSED_CONTEXT;
93a8090d
NIS		 2307#endif
2308}
2309
168d5872
NIS		 2310void
2311PerlIOUnix_refcnt_inc(int fd)
2312{
27da23d5 2313 dTHX;
22c96fc1 2314 if (fd >= 0) {
97aff369 2315 dVAR;
22c96fc1 2316
168d5872 2317#ifdef USE_THREADS
6cb8cb21 2318 MUTEX_LOCK(&PL_perlio_mutex);
168d5872 2319#endif
22c96fc1
NC		 2320 if (fd >= PL_perlio_fd_refcnt_size)
2321 S_more_refcounted_fds(aTHX_ fd);
2322
27da23d5
JH		 2323 PL_perlio_fd_refcnt[fd]++;
2324 PerlIO_debug("fd %d refcnt=%d\n",fd,PL_perlio_fd_refcnt[fd]);
22c96fc1 2325
168d5872 2326#ifdef USE_THREADS
6cb8cb21 2327 MUTEX_UNLOCK(&PL_perlio_mutex);
168d5872
NIS		 2328#endif
2329 }
2330}
2331
168d5872
NIS		 2332int
2333PerlIOUnix_refcnt_dec(int fd)
2334{
27da23d5 2335 dTHX;
168d5872 2336 int cnt = 0;
22c96fc1 2337 if (fd >= 0) {
97aff369 2338 dVAR;
168d5872 2339#ifdef USE_THREADS
6cb8cb21 2340 MUTEX_LOCK(&PL_perlio_mutex);
168d5872 2341#endif
22c96fc1
NC		 2342 /* XXX should this be a panic? */
2343 if (fd >= PL_perlio_fd_refcnt_size)
2344 S_more_refcounted_fds(aTHX_ fd);
2345
2346 /* XXX should this be a panic if it drops below 0? */
27da23d5 2347 cnt = --PL_perlio_fd_refcnt[fd];
168d5872
NIS		 2348 PerlIO_debug("fd %d refcnt=%d\n",fd,cnt);
2349#ifdef USE_THREADS
6cb8cb21 2350 MUTEX_UNLOCK(&PL_perlio_mutex);
168d5872
NIS		 2351#endif
2352 }
2353 return cnt;
2354}
2355
694c95cf
JH		 2356void
2357PerlIO_cleanup(pTHX)
2358{
97aff369 2359 dVAR;
694c95cf
JH		 2360 int i;
2361#ifdef USE_ITHREADS
a25429c6 2362 PerlIO_debug("Cleanup layers for %p\n",(void*)aTHX);
9f4bd222
NIS		 2363#else
2364 PerlIO_debug("Cleanup layers\n");
694c95cf 2365#endif
e47547a8 2366
694c95cf
JH		 2367 /* Raise STDIN..STDERR refcount so we don't close them */
2368 for (i=0; i < 3; i++)
2369 PerlIOUnix_refcnt_inc(i);
2370 PerlIO_cleantable(aTHX_ &PL_perlio);
2371 /* Restore STDIN..STDERR refcount */
2372 for (i=0; i < 3; i++)
2373 PerlIOUnix_refcnt_dec(i);
9f4bd222
NIS		 2374
2375 if (PL_known_layers) {
2376 PerlIO_list_free(aTHX_ PL_known_layers);
2377 PL_known_layers = NULL;
2378 }
27da23d5 2379 if (PL_def_layerlist) {
9f4bd222
NIS		 2380 PerlIO_list_free(aTHX_ PL_def_layerlist);
2381 PL_def_layerlist = NULL;
2382 }
6cb8cb21
RGS		 2383}
2384
2385void PerlIO_teardown(pTHX) /* Call only from PERL_SYS_TERM(). */
2386{
2387#ifdef DEBUGGING
2388 {
2389 /* By now all filehandles should have been closed, so any
2390 * stray (non-STD-)filehandles indicate *possible* (PerlIO)
2391 * errors. */
2392 int i;
2393 for (i = 3; i < PL_perlio_fd_refcnt_size; i++) {
2394 if (PL_perlio_fd_refcnt[i])
2395 PerlIO_debug("PerlIO_cleanup: fd %d refcnt=%d\n",
2396 i, PL_perlio_fd_refcnt[i]);
2397 }
2398 }
2399#endif
1cd82952 2400#ifdef USE_THREADS
6cb8cb21 2401 MUTEX_LOCK(&PL_perlio_mutex);
1cd82952
RGS		 2402#endif
2403 if (PL_perlio_fd_refcnt_size /* Assuming initial size of zero. */
2404 && PL_perlio_fd_refcnt) {
2405#ifdef PERL_TRACK_MEMPOOL
2406 Malloc_t ptr = (Malloc_t)((char*)PL_perlio_fd_refcnt-sTHX);
2407 struct perl_memory_debug_header *const header
2408 = (struct perl_memory_debug_header *)ptr;
2409 /* Only the thread that allocated us can free us. */
2410 if (header->interpreter == aTHX)
2411#endif
2412 {
6cb8cb21 2413 PerlMemShared_free(PL_perlio_fd_refcnt); /* Not Safefree() because was allocated with PerlMemShared_realloc(). */
1cd82952
RGS		 2414 PL_perlio_fd_refcnt = NULL;
2415 PL_perlio_fd_refcnt_size = 0;
2416 }
2417 }
2418#ifdef USE_THREADS
6cb8cb21 2419 MUTEX_UNLOCK(&PL_perlio_mutex);
1cd82952 2420#endif
694c95cf
JH		 2421}
2422
2423
2424
9e353e3b 2425/*--------------------------------------------------------------------------------------*/
14a5cf38 2426/*
71200d45 2427 * Bottom-most level for UNIX-like case
14a5cf38 2428 */
9e353e3b 2429
14a5cf38 2430typedef struct {
22569500
NIS		 2431 struct _PerlIO base; /* The generic part */
2432 int fd; /* UNIX like file descriptor */
2433 int oflags; /* open/fcntl flags */
9e353e3b
NIS		 2434} PerlIOUnix;
2435
6f9d8c32 2436int
9e353e3b 2437PerlIOUnix_oflags(const char *mode)
760ac839 2438{
14a5cf38 2439 int oflags = -1;
3b6c1aba 2440 if (*mode == IoTYPE_IMPLICIT || *mode == IoTYPE_NUMERIC)
14a5cf38
JH		 2441 mode++;
2442 switch (*mode) {
2443 case 'r':
2444 oflags = O_RDONLY;
2445 if (*++mode == '+') {
2446 oflags = O_RDWR;
2447 mode++;
2448 }
2449 break;
2450
2451 case 'w':
2452 oflags = O_CREAT | O_TRUNC;
2453 if (*++mode == '+') {
2454 oflags |= O_RDWR;
2455 mode++;
2456 }
2457 else
2458 oflags |= O_WRONLY;
2459 break;
2460
2461 case 'a':
2462 oflags = O_CREAT | O_APPEND;
2463 if (*++mode == '+') {
2464 oflags |= O_RDWR;
2465 mode++;
2466 }
2467 else
2468 oflags |= O_WRONLY;
2469 break;
2470 }
2471 if (*mode == 'b') {
2472 oflags |= O_BINARY;
2473 oflags &= ~O_TEXT;
2474 mode++;
2475 }
2476 else if (*mode == 't') {
2477 oflags |= O_TEXT;
2478 oflags &= ~O_BINARY;
2479 mode++;
2480 }
2481 /*
71200d45 2482 * Always open in binary mode
14a5cf38
JH		 2483 */
2484 oflags |= O_BINARY;
2485 if (*mode || oflags == -1) {
93189314 2486 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH		 2487 oflags = -1;
2488 }
2489 return oflags;
9e353e3b
NIS		 2490}
2491
2492IV
f62ce20a 2493PerlIOUnix_fileno(pTHX_ PerlIO *f)
9e353e3b 2494{
96a5add6 2495 PERL_UNUSED_CONTEXT;
14a5cf38 2496 return PerlIOSelf(f, PerlIOUnix)->fd;
9e353e3b
NIS		 2497}
2498
aa063c35
NIS		 2499static void
2500PerlIOUnix_setfd(pTHX_ PerlIO *f, int fd, int imode)
4b803d04 2501{
de009b76 2502 PerlIOUnix * const s = PerlIOSelf(f, PerlIOUnix);
6caa5a9c 2503#if defined(WIN32)
aa063c35
NIS		 2504 Stat_t st;
2505 if (PerlLIO_fstat(fd, &st) == 0) {
6caa5a9c 2506 if (!S_ISREG(st.st_mode)) {
aa063c35 2507 PerlIO_debug("%d is not regular file\n",fd);
6caa5a9c
NIS		 2508 PerlIOBase(f)->flags |= PERLIO_F_NOTREG;
2509 }
aa063c35
NIS		 2510 else {
2511 PerlIO_debug("%d _is_ a regular file\n",fd);
2512 }
6caa5a9c
NIS		 2513 }
2514#endif
aa063c35
NIS		 2515 s->fd = fd;
2516 s->oflags = imode;
2517 PerlIOUnix_refcnt_inc(fd);
96a5add6 2518 PERL_UNUSED_CONTEXT;
aa063c35
NIS		 2519}
2520
2521IV
2522PerlIOUnix_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
2523{
2524 IV code = PerlIOBase_pushed(aTHX_ f, mode, arg, tab);
14a5cf38 2525 if (*PerlIONext(f)) {
4b069b44 2526 /* We never call down so do any pending stuff now */
03c0554d 2527 PerlIO_flush(PerlIONext(f));
14a5cf38 2528 /*
71200d45 2529 * XXX could (or should) we retrieve the oflags from the open file
14a5cf38 2530 * handle rather than believing the "mode" we are passed in? XXX
71200d45 2531 * Should the value on NULL mode be 0 or -1?
14a5cf38 2532 */
acbd16bf 2533 PerlIOUnix_setfd(aTHX_ f, PerlIO_fileno(PerlIONext(f)),
aa063c35 2534 mode ? PerlIOUnix_oflags(mode) : -1);
14a5cf38
JH		 2535 }
2536 PerlIOBase(f)->flags |= PERLIO_F_OPEN;
6caa5a9c 2537
14a5cf38 2538 return code;
4b803d04
NIS		 2539}
2540
c2fcde81
JH		 2541IV
2542PerlIOUnix_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
2543{
de009b76 2544 const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
0723351e 2545 Off_t new_loc;
96a5add6 2546 PERL_UNUSED_CONTEXT;
c2fcde81
JH		 2547 if (PerlIOBase(f)->flags & PERLIO_F_NOTREG) {
2548#ifdef ESPIPE
2549 SETERRNO(ESPIPE, LIB_INVARG);
2550#else
2551 SETERRNO(EINVAL, LIB_INVARG);
2552#endif
2553 return -1;
2554 }
0723351e
NC		 2555 new_loc = PerlLIO_lseek(fd, offset, whence);
2556 if (new_loc == (Off_t) - 1)
dcda55fc 2557 return -1;
c2fcde81
JH		 2558 PerlIOBase(f)->flags &= ~PERLIO_F_EOF;
2559 return 0;
2560}
2561
9e353e3b 2562PerlIO *
14a5cf38
JH		 2563PerlIOUnix_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers,
2564 IV n, const char *mode, int fd, int imode,
2565 int perm, PerlIO *f, int narg, SV **args)
2566{
d9dac8cd 2567 if (PerlIOValid(f)) {
14a5cf38 2568 if (PerlIOBase(f)->flags & PERLIO_F_OPEN)
f62ce20a 2569 (*PerlIOBase(f)->tab->Close)(aTHX_ f);
14a5cf38
JH		 2570 }
2571 if (narg > 0) {
3b6c1aba 2572 if (*mode == IoTYPE_NUMERIC)
14a5cf38
JH		 2573 mode++;
2574 else {
2575 imode = PerlIOUnix_oflags(mode);
2576 perm = 0666;
2577 }
2578 if (imode != -1) {
e62f0680 2579 const char *path = SvPV_nolen_const(*args);
14a5cf38
JH		 2580 fd = PerlLIO_open3(path, imode, perm);
2581 }
2582 }
2583 if (fd >= 0) {
3b6c1aba 2584 if (*mode == IoTYPE_IMPLICIT)
14a5cf38
JH		 2585 mode++;
2586 if (!f) {
2587 f = PerlIO_allocate(aTHX);
d9dac8cd
NIS		 2588 }
2589 if (!PerlIOValid(f)) {
a33cf58c
NIS		 2590 if (!(f = PerlIO_push(aTHX_ f, self, mode, PerlIOArg))) {
2591 return NULL;
2592 }
d9dac8cd 2593 }
aa063c35 2594 PerlIOUnix_setfd(aTHX_ f, fd, imode);
14a5cf38 2595 PerlIOBase(f)->flags |= PERLIO_F_OPEN;
c2fcde81
JH		 2596 if (*mode == IoTYPE_APPEND)
2597 PerlIOUnix_seek(aTHX_ f, 0, SEEK_END);
14a5cf38
JH		 2598 return f;
2599 }
2600 else {
2601 if (f) {
6f207bd3 2602 NOOP;
14a5cf38 2603 /*
71200d45 2604 * FIXME: pop layers ???
14a5cf38
JH		 2605 */
2606 }
2607 return NULL;
2608 }
9e353e3b
NIS		 2609}
2610
71200d45 2611PerlIO *
ecdeb87c 2612PerlIOUnix_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
71200d45 2613{
dcda55fc 2614 const PerlIOUnix * const os = PerlIOSelf(o, PerlIOUnix);
93a8090d 2615 int fd = os->fd;
ecdeb87c
NIS		 2616 if (flags & PERLIO_DUP_FD) {
2617 fd = PerlLIO_dup(fd);
2618 }
22c96fc1 2619 if (fd >= 0) {
ecdeb87c 2620 f = PerlIOBase_dup(aTHX_ f, o, param, flags);
71200d45
NIS		 2621 if (f) {
2622 /* If all went well overwrite fd in dup'ed lay with the dup()'ed fd */
aa063c35 2623 PerlIOUnix_setfd(aTHX_ f, fd, os->oflags);
71200d45
NIS		 2624 return f;
2625 }
71200d45
NIS		 2626 }
2627 return NULL;
2628}
2629
2630
9e353e3b 2631SSize_t
f62ce20a 2632PerlIOUnix_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
9e353e3b 2633{
97aff369 2634 dVAR;
de009b76 2635 const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
27da23d5
JH		 2636#ifdef PERLIO_STD_SPECIAL
2637 if (fd == 0)
2638 return PERLIO_STD_IN(fd, vbuf, count);
2639#endif
81428673 2640 if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD) ||
1fd8f4ce 2641 PerlIOBase(f)->flags & (PERLIO_F_EOF|PERLIO_F_ERROR)) {
263df5f1 2642 return 0;
1fd8f4ce 2643 }
14a5cf38 2644 while (1) {
b464bac0 2645 const SSize_t len = PerlLIO_read(fd, vbuf, count);
14a5cf38 2646 if (len >= 0 || errno != EINTR) {
ba85f2ea
NIS		 2647 if (len < 0) {
2648 if (errno != EAGAIN) {
2649 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
2650 }
2651 }
2652 else if (len == 0 && count != 0) {
14a5cf38 2653 PerlIOBase(f)->flags |= PERLIO_F_EOF;
ba85f2ea
NIS		 2654 SETERRNO(0,0);
2655 }
14a5cf38
JH		 2656 return len;
2657 }
2658 PERL_ASYNC_CHECK();
2659 }
b464bac0 2660 /*NOTREACHED*/
9e353e3b
NIS		 2661}
2662
2663SSize_t
f62ce20a 2664PerlIOUnix_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 2665{
97aff369 2666 dVAR;
de009b76 2667 const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
27da23d5
JH		 2668#ifdef PERLIO_STD_SPECIAL
2669 if (fd == 1 || fd == 2)
2670 return PERLIO_STD_OUT(fd, vbuf, count);
2671#endif
14a5cf38 2672 while (1) {
de009b76 2673 const SSize_t len = PerlLIO_write(fd, vbuf, count);
14a5cf38 2674 if (len >= 0 || errno != EINTR) {
ba85f2ea
NIS		 2675 if (len < 0) {
2676 if (errno != EAGAIN) {
2677 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
2678 }
2679 }
14a5cf38
JH		 2680 return len;
2681 }
2682 PERL_ASYNC_CHECK();
06da4f11 2683 }
1b6737cc 2684 /*NOTREACHED*/
9e353e3b
NIS		 2685}
2686
9e353e3b 2687Off_t
f62ce20a 2688PerlIOUnix_tell(pTHX_ PerlIO *f)
9e353e3b 2689{
96a5add6
AL		 2690 PERL_UNUSED_CONTEXT;
2691
14a5cf38 2692 return PerlLIO_lseek(PerlIOSelf(f, PerlIOUnix)->fd, 0, SEEK_CUR);
9e353e3b
NIS		 2693}
2694
71200d45 2695
9e353e3b 2696IV
f62ce20a 2697PerlIOUnix_close(pTHX_ PerlIO *f)
9e353e3b 2698{
97aff369 2699 dVAR;
de009b76 2700 const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
14a5cf38 2701 int code = 0;
168d5872
NIS		 2702 if (PerlIOBase(f)->flags & PERLIO_F_OPEN) {
2703 if (PerlIOUnix_refcnt_dec(fd) > 0) {
93a8090d
NIS		 2704 PerlIOBase(f)->flags &= ~PERLIO_F_OPEN;
2705 return 0;
22569500 2706 }
93a8090d
NIS		 2707 }
2708 else {
93189314 2709 SETERRNO(EBADF,SS_IVCHAN);
93a8090d
NIS		 2710 return -1;
2711 }
14a5cf38
JH		 2712 while (PerlLIO_close(fd) != 0) {
2713 if (errno != EINTR) {
2714 code = -1;
2715 break;
2716 }
2717 PERL_ASYNC_CHECK();
2718 }
2719 if (code == 0) {
2720 PerlIOBase(f)->flags &= ~PERLIO_F_OPEN;
2721 }
2722 return code;
9e353e3b
NIS		 2723}
2724
27da23d5 2725PERLIO_FUNCS_DECL(PerlIO_unix) = {
2dc2558e 2726 sizeof(PerlIO_funcs),
14a5cf38
JH		 2727 "unix",
2728 sizeof(PerlIOUnix),
2729 PERLIO_K_RAW,
2730 PerlIOUnix_pushed,
44798d05 2731 PerlIOBase_popped,
14a5cf38 2732 PerlIOUnix_open,
86e05cf2 2733 PerlIOBase_binmode, /* binmode */
14a5cf38
JH		 2734 NULL,
2735 PerlIOUnix_fileno,
71200d45 2736 PerlIOUnix_dup,
14a5cf38
JH		 2737 PerlIOUnix_read,
2738 PerlIOBase_unread,
2739 PerlIOUnix_write,
2740 PerlIOUnix_seek,
2741 PerlIOUnix_tell,
2742 PerlIOUnix_close,
22569500
NIS		 2743 PerlIOBase_noop_ok, /* flush */
2744 PerlIOBase_noop_fail, /* fill */
14a5cf38
JH		 2745 PerlIOBase_eof,
2746 PerlIOBase_error,
2747 PerlIOBase_clearerr,
2748 PerlIOBase_setlinebuf,
22569500
NIS		 2749 NULL, /* get_base */
2750 NULL, /* get_bufsiz */
2751 NULL, /* get_ptr */
2752 NULL, /* get_cnt */
2753 NULL, /* set_ptrcnt */
9e353e3b
NIS		 2754};
2755
2756/*--------------------------------------------------------------------------------------*/
14a5cf38 2757/*
71200d45 2758 * stdio as a layer
14a5cf38 2759 */
9e353e3b 2760
313e59c8
NIS		 2761#if defined(VMS) && !defined(STDIO_BUFFER_WRITABLE)
2762/* perl5.8 - This ensures the last minute VMS ungetc fix is not
2763 broken by the last second glibc 2.3 fix
2764 */
2765#define STDIO_BUFFER_WRITABLE
2766#endif
2767
2768
14a5cf38
JH		 2769typedef struct {
2770 struct _PerlIO base;
22569500 2771 FILE *stdio; /* The stream */
9e353e3b
NIS		 2772} PerlIOStdio;
2773
2774IV
f62ce20a 2775PerlIOStdio_fileno(pTHX_ PerlIO *f)
9e353e3b 2776{
96a5add6
AL		 2777 PERL_UNUSED_CONTEXT;
2778
c4420975
AL		 2779 if (PerlIOValid(f)) {
2780 FILE * const s = PerlIOSelf(f, PerlIOStdio)->stdio;
2781 if (s)
2782 return PerlSIO_fileno(s);
439ba545
NIS		 2783 }
2784 errno = EBADF;
2785 return -1;
9e353e3b
NIS		 2786}
2787
766a733e 2788char *
14a5cf38
JH		 2789PerlIOStdio_mode(const char *mode, char *tmode)
2790{
de009b76 2791 char * const ret = tmode;
a0625d38
SR		 2792 if (mode) {
2793 while (*mode) {
2794 *tmode++ = *mode++;
2795 }
14a5cf38 2796 }
95005ad8 2797#if defined(PERLIO_USING_CRLF) || defined(__CYGWIN__)
6ce75a77
JH		 2798 *tmode++ = 'b';
2799#endif
14a5cf38
JH		 2800 *tmode = '\0';
2801 return ret;
2802}
2803
4b803d04 2804IV
2dc2558e 2805PerlIOStdio_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
4b803d04 2806{
1fd8f4ce
NIS		 2807 PerlIO *n;
2808 if (PerlIOValid(f) && PerlIOValid(n = PerlIONext(f))) {
46c461b5 2809 PerlIO_funcs * const toptab = PerlIOBase(n)->tab;
1fd8f4ce
NIS		 2810 if (toptab == tab) {
2811 /* Top is already stdio - pop self (duplicate) and use original */
2812 PerlIO_pop(aTHX_ f);
2813 return 0;
2814 } else {
de009b76 2815 const int fd = PerlIO_fileno(n);
1fd8f4ce
NIS		 2816 char tmode[8];
2817 FILE *stdio;
81428673 2818 if (fd >= 0 && (stdio = PerlSIO_fdopen(fd,
1fd8f4ce
NIS		 2819 mode = PerlIOStdio_mode(mode, tmode)))) {
2820 PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
2821 /* We never call down so do any pending stuff now */
2822 PerlIO_flush(PerlIONext(f));
81428673 2823 }
1fd8f4ce
NIS		 2824 else {
2825 return -1;
2826 }
2827 }
14a5cf38 2828 }
2dc2558e 2829 return PerlIOBase_pushed(aTHX_ f, mode, arg, tab);
4b803d04
NIS		 2830}
2831
22569500 2832
9e353e3b 2833PerlIO *
4b069b44 2834PerlIO_importFILE(FILE *stdio, const char *mode)
9e353e3b 2835{
14a5cf38
JH		 2836 dTHX;
2837 PerlIO *f = NULL;
2838 if (stdio) {
22569500 2839 PerlIOStdio *s;
4b069b44
NIS		 2840 if (!mode || !*mode) {
2841 /* We need to probe to see how we can open the stream
2842 so start with read/write and then try write and read
2843 we dup() so that we can fclose without loosing the fd.
2844
2845 Note that the errno value set by a failing fdopen
2846 varies between stdio implementations.
2847 */
de009b76 2848 const int fd = PerlLIO_dup(fileno(stdio));
a33cf58c 2849 FILE *f2 = PerlSIO_fdopen(fd, (mode = "r+"));
4b069b44 2850 if (!f2) {
a33cf58c 2851 f2 = PerlSIO_fdopen(fd, (mode = "w"));
4b069b44
NIS		 2852 }
2853 if (!f2) {
a33cf58c 2854 f2 = PerlSIO_fdopen(fd, (mode = "r"));
4b069b44
NIS		 2855 }
2856 if (!f2) {
2857 /* Don't seem to be able to open */
2858 PerlLIO_close(fd);
2859 return f;
2860 }
2861 fclose(f2);
22569500 2862 }
a0714e2c 2863 if ((f = PerlIO_push(aTHX_(f = PerlIO_allocate(aTHX)), PERLIO_FUNCS_CAST(&PerlIO_stdio), mode, NULL))) {
a33cf58c
NIS		 2864 s = PerlIOSelf(f, PerlIOStdio);
2865 s->stdio = stdio;
2866 }
14a5cf38
JH		 2867 }
2868 return f;
9e353e3b
NIS		 2869}
2870
2871PerlIO *
14a5cf38
JH		 2872PerlIOStdio_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers,
2873 IV n, const char *mode, int fd, int imode,
2874 int perm, PerlIO *f, int narg, SV **args)
2875{
2876 char tmode[8];
d9dac8cd 2877 if (PerlIOValid(f)) {
dcda55fc
AL		 2878 const char * const path = SvPV_nolen_const(*args);
2879 PerlIOStdio * const s = PerlIOSelf(f, PerlIOStdio);
1751d015
NIS		 2880 FILE *stdio;
2881 PerlIOUnix_refcnt_dec(fileno(s->stdio));
2882 stdio = PerlSIO_freopen(path, (mode = PerlIOStdio_mode(mode, tmode)),
14a5cf38
JH		 2883 s->stdio);
2884 if (!s->stdio)
2885 return NULL;
2886 s->stdio = stdio;
1751d015 2887 PerlIOUnix_refcnt_inc(fileno(s->stdio));
14a5cf38
JH		 2888 return f;
2889 }
2890 else {
2891 if (narg > 0) {
dcda55fc 2892 const char * const path = SvPV_nolen_const(*args);
3b6c1aba 2893 if (*mode == IoTYPE_NUMERIC) {
14a5cf38
JH		 2894 mode++;
2895 fd = PerlLIO_open3(path, imode, perm);
2896 }
2897 else {
95005ad8
GH		 2898 FILE *stdio;
2899 bool appended = FALSE;
2900#ifdef __CYGWIN__
2901 /* Cygwin wants its 'b' early. */
2902 appended = TRUE;
2903 mode = PerlIOStdio_mode(mode, tmode);
2904#endif
2905 stdio = PerlSIO_fopen(path, mode);
6f0313ac 2906 if (stdio) {
6f0313ac
JH		 2907 if (!f) {
2908 f = PerlIO_allocate(aTHX);
2909 }
95005ad8
GH		 2910 if (!appended)
2911 mode = PerlIOStdio_mode(mode, tmode);
2912 f = PerlIO_push(aTHX_ f, self, mode, PerlIOArg);
2913 if (f) {
0f0f9e2b
JH		 2914 PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
2915 PerlIOUnix_refcnt_inc(fileno(stdio));
2916 } else {
2917 PerlSIO_fclose(stdio);
6f0313ac
JH		 2918 }
2919 return f;
2920 }
2921 else {
2922 return NULL;
2923 }
14a5cf38
JH		 2924 }
2925 }
2926 if (fd >= 0) {
2927 FILE *stdio = NULL;
2928 int init = 0;
3b6c1aba 2929 if (*mode == IoTYPE_IMPLICIT) {
14a5cf38
JH		 2930 init = 1;
2931 mode++;
2932 }
2933 if (init) {
2934 switch (fd) {
2935 case 0:
2936 stdio = PerlSIO_stdin;
2937 break;
2938 case 1:
2939 stdio = PerlSIO_stdout;
2940 break;
2941 case 2:
2942 stdio = PerlSIO_stderr;
2943 break;
2944 }
2945 }
2946 else {
2947 stdio = PerlSIO_fdopen(fd, mode =
2948 PerlIOStdio_mode(mode, tmode));
2949 }
2950 if (stdio) {
d9dac8cd
NIS		 2951 if (!f) {
2952 f = PerlIO_allocate(aTHX);
2953 }
a33cf58c 2954 if ((f = PerlIO_push(aTHX_ f, self, mode, PerlIOArg))) {
1a159fba
JH		 2955 PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
2956 PerlIOUnix_refcnt_inc(fileno(stdio));
a33cf58c 2957 }
14a5cf38
JH		 2958 return f;
2959 }
2960 }
2961 }
ee518936 2962 return NULL;
9e353e3b
NIS		 2963}
2964
1751d015 2965PerlIO *
ecdeb87c 2966PerlIOStdio_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
1751d015
NIS		 2967{
2968 /* This assumes no layers underneath - which is what
2969 happens, but is not how I remember it. NI-S 2001/10/16
2970 */
ecdeb87c 2971 if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) {
694c95cf 2972 FILE *stdio = PerlIOSelf(o, PerlIOStdio)->stdio;
de009b76 2973 const int fd = fileno(stdio);
9217ff3f 2974 char mode[8];
ecdeb87c 2975 if (flags & PERLIO_DUP_FD) {
de009b76 2976 const int dfd = PerlLIO_dup(fileno(stdio));
9217ff3f
NIS		 2977 if (dfd >= 0) {
2978 stdio = PerlSIO_fdopen(dfd, PerlIO_modestr(o,mode));
2979 goto set_this;
ecdeb87c
NIS		 2980 }
2981 else {
6f207bd3 2982 NOOP;
ecdeb87c
NIS		 2983 /* FIXME: To avoid messy error recovery if dup fails
2984 re-use the existing stdio as though flag was not set
2985 */
2986 }
2987 }
9217ff3f
NIS		 2988 stdio = PerlSIO_fdopen(fd, PerlIO_modestr(o,mode));
2989 set_this:
694c95cf
JH		 2990 PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
2991 PerlIOUnix_refcnt_inc(fileno(stdio));
1751d015
NIS		 2992 }
2993 return f;
2994}
2995
0d7a5398
NIS		 2996static int
2997PerlIOStdio_invalidate_fileno(pTHX_ FILE *f)
2998{
96a5add6
AL		 2999 PERL_UNUSED_CONTEXT;
3000
0d7a5398 3001 /* XXX this could use PerlIO_canset_fileno() and
37725cdc 3002 * PerlIO_set_fileno() support from Configure
0d7a5398 3003 */
ef8eacb8
AT		 3004# if defined(__UCLIBC__)
3005 /* uClibc must come before glibc because it defines __GLIBC__ as well. */
3006 f->__filedes = -1;
3007 return 1;
3008# elif defined(__GLIBC__)
0d7a5398 3009 /* There may be a better way for GLIBC:
37725cdc 3010 - libio.h defines a flag to not close() on cleanup
0d7a5398
NIS		 3011 */
3012 f->_fileno = -1;
3013 return 1;
3014# elif defined(__sun__)
f5992bc4 3015 PERL_UNUSED_ARG(f);
cfedb851 3016 return 0;
0d7a5398
NIS		 3017# elif defined(__hpux)
3018 f->__fileH = 0xff;
3019 f->__fileL = 0xff;
3020 return 1;
9837d373 3021 /* Next one ->_file seems to be a reasonable fallback, i.e. if
37725cdc 3022 your platform does not have special entry try this one.
9837d373
NIS		 3023 [For OSF only have confirmation for Tru64 (alpha)
3024 but assume other OSFs will be similar.]
37725cdc 3025 */
9837d373 3026# elif defined(_AIX) || defined(__osf__) || defined(__irix__)
0d7a5398
NIS		 3027 f->_file = -1;
3028 return 1;
3029# elif defined(__FreeBSD__)
3030 /* There may be a better way on FreeBSD:
37725cdc
NIS		 3031 - we could insert a dummy func in the _close function entry
3032 f->_close = (int (*)(void *)) dummy_close;
0d7a5398
NIS		 3033 */
3034 f->_file = -1;
0c49ea6a
SU		 3035 return 1;
3036# elif defined(__OpenBSD__)
3037 /* There may be a better way on OpenBSD:
3038 - we could insert a dummy func in the _close function entry
3039 f->_close = (int (*)(void *)) dummy_close;
3040 */
3041 f->_file = -1;
0d7a5398 3042 return 1;
59ad941d
IZ		 3043# elif defined(__EMX__)
3044 /* f->_flags &= ~_IOOPEN; */ /* Will leak stream->_buffer */
3045 f->_handle = -1;
3046 return 1;
0d7a5398
NIS		 3047# elif defined(__CYGWIN__)
3048 /* There may be a better way on CYGWIN:
37725cdc
NIS		 3049 - we could insert a dummy func in the _close function entry
3050 f->_close = (int (*)(void *)) dummy_close;
0d7a5398
NIS		 3051 */
3052 f->_file = -1;
3053 return 1;
3054# elif defined(WIN32)
3055# if defined(__BORLANDC__)
3056 f->fd = PerlLIO_dup(fileno(f));
b475b3e6
JH		 3057# elif defined(UNDER_CE)
3058 /* WIN_CE does not have access to FILE internals, it hardly has FILE
3059 structure at all
3060 */
0d7a5398
NIS		 3061# else
3062 f->_file = -1;
3063# endif
3064 return 1;
3065# else
3066#if 0
37725cdc 3067 /* Sarathy's code did this - we fall back to a dup/dup2 hack
0d7a5398 3068 (which isn't thread safe) instead
37725cdc 3069 */
0d7a5398
NIS		 3070# error "Don't know how to set FILE.fileno on your platform"
3071#endif
8772537c 3072 PERL_UNUSED_ARG(f);
0d7a5398
NIS		 3073 return 0;
3074# endif
3075}
3076
1751d015 3077IV
f62ce20a 3078PerlIOStdio_close(pTHX_ PerlIO *f)
1751d015 3079{
c4420975 3080 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
439ba545
NIS		 3081 if (!stdio) {
3082 errno = EBADF;
3083 return -1;
3084 }
9217ff3f 3085 else {
de009b76 3086 const int fd = fileno(stdio);
0d7a5398 3087 int invalidate = 0;
bbfd922f 3088 IV result = 0;
0d7a5398
NIS		 3089 int saveerr = 0;
3090 int dupfd = 0;
3091#ifdef SOCKS5_VERSION_NAME
37725cdc
NIS		 3092 /* Socks lib overrides close() but stdio isn't linked to
3093 that library (though we are) - so we must call close()
3094 on sockets on stdio's behalf.
3095 */
0d7a5398
NIS		 3096 int optval;
3097 Sock_size_t optlen = sizeof(int);
6b4ce6c8 3098 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *) &optval, &optlen) == 0)
37725cdc 3099 invalidate = 1;
0d7a5398 3100#endif
6b4ce6c8 3101 if (PerlIOUnix_refcnt_dec(fd) > 0) /* File descriptor still in use */
0d7a5398 3102 invalidate = 1;
0d7a5398 3103 if (invalidate) {
6b4ce6c8
AL		 3104 /* For STD* handles, don't close stdio, since we shared the FILE *, too. */
3105 if (stdio == stdin) /* Some stdios are buggy fflush-ing inputs */
3106 return 0;
3107 if (stdio == stdout || stdio == stderr)
3108 return PerlIO_flush(f);
37725cdc
NIS		 3109 /* Tricky - must fclose(stdio) to free memory but not close(fd)
3110 Use Sarathy's trick from maint-5.6 to invalidate the
3111 fileno slot of the FILE *
3112 */
bbfd922f 3113 result = PerlIO_flush(f);
0d7a5398 3114 saveerr = errno;
6b4ce6c8
AL		 3115 invalidate = PerlIOStdio_invalidate_fileno(aTHX_ stdio);
3116 if (!invalidate)
3117 dupfd = PerlLIO_dup(fd);
37725cdc 3118 }
0d7a5398 3119 result = PerlSIO_fclose(stdio);
37725cdc
NIS		 3120 /* We treat error from stdio as success if we invalidated
3121 errno may NOT be expected EBADF
e8529473
NIS		 3122 */
3123 if (invalidate && result != 0) {
0d7a5398
NIS		 3124 errno = saveerr;
3125 result = 0;
37725cdc 3126 }
6b4ce6c8
AL		 3127#ifdef SOCKS5_VERSION_NAME
3128 /* in SOCKS' case, let close() determine return value */
3129 result = close(fd);
3130#endif
0d7a5398
NIS		 3131 if (dupfd) {
3132 PerlLIO_dup2(dupfd,fd);
8a521f28 3133 PerlLIO_close(dupfd);
9217ff3f
NIS		 3134 }
3135 return result;
37725cdc 3136 }
1751d015
NIS		 3137}
3138
9e353e3b 3139SSize_t
f62ce20a 3140PerlIOStdio_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
9e353e3b 3141{
97aff369 3142 dVAR;
c4420975 3143 FILE * const s = PerlIOSelf(f, PerlIOStdio)->stdio;
14a5cf38 3144 SSize_t got = 0;
4d948241
NIS		 3145 for (;;) {
3146 if (count == 1) {
3147 STDCHAR *buf = (STDCHAR *) vbuf;
3148 /*
3149 * Perl is expecting PerlIO_getc() to fill the buffer Linux's
3150 * stdio does not do that for fread()
3151 */
de009b76 3152 const int ch = PerlSIO_fgetc(s);
4d948241
NIS		 3153 if (ch != EOF) {
3154 *buf = ch;
3155 got = 1;
3156 }
14a5cf38 3157 }
4d948241
NIS		 3158 else
3159 got = PerlSIO_fread(vbuf, 1, count, s);
b1d8b47a
CS		 3160 if (got == 0 && PerlSIO_ferror(s))
3161 got = -1;
42a7a32f 3162 if (got >= 0 || errno != EINTR)
4d948241
NIS		 3163 break;
3164 PERL_ASYNC_CHECK();
42a7a32f 3165 SETERRNO(0,0); /* just in case */
14a5cf38 3166 }
14a5cf38 3167 return got;
9e353e3b
NIS		 3168}
3169
3170SSize_t
f62ce20a 3171PerlIOStdio_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 3172{
14a5cf38 3173 SSize_t unread = 0;
c4420975 3174 FILE * const s = PerlIOSelf(f, PerlIOStdio)->stdio;
93679785 3175
313e59c8 3176#ifdef STDIO_BUFFER_WRITABLE
9f7cd136 3177 if (PerlIO_fast_gets(f) && PerlIO_has_base(f)) {
93679785
NIS		 3178 STDCHAR *buf = ((STDCHAR *) vbuf) + count;
3179 STDCHAR *base = PerlIO_get_base(f);
3180 SSize_t cnt = PerlIO_get_cnt(f);
3181 STDCHAR *ptr = PerlIO_get_ptr(f);
3182 SSize_t avail = ptr - base;
3183 if (avail > 0) {
3184 if (avail > count) {
3185 avail = count;
3186 }
3187 ptr -= avail;
3188 Move(buf-avail,ptr,avail,STDCHAR);
3189 count -= avail;
3190 unread += avail;
3191 PerlIO_set_ptrcnt(f,ptr,cnt+avail);
9f7cd136
NIS		 3192 if (PerlSIO_feof(s) && unread >= 0)
3193 PerlSIO_clearerr(s);
3194 }
3195 }
313e59c8
NIS		 3196 else
3197#endif
3198 if (PerlIO_has_cntptr(f)) {
9f7cd136
NIS		 3199 /* We can get pointer to buffer but not its base
3200 Do ungetc() but check chars are ending up in the
3201 buffer
3202 */
3203 STDCHAR *eptr = (STDCHAR*)PerlSIO_get_ptr(s);
3204 STDCHAR *buf = ((STDCHAR *) vbuf) + count;
3205 while (count > 0) {
de009b76 3206 const int ch = *--buf & 0xFF;
9f7cd136
NIS		 3207 if (ungetc(ch,s) != ch) {
3208 /* ungetc did not work */
3209 break;
3210 }
3211 if ((STDCHAR*)PerlSIO_get_ptr(s) != --eptr || ((*eptr & 0xFF) != ch)) {
3212 /* Did not change pointer as expected */
3213 fgetc(s); /* get char back again */
3214 break;
3215 }
3216 /* It worked ! */
3217 count--;
3218 unread++;
93679785
NIS		 3219 }
3220 }
3221
3222 if (count > 0) {
3223 unread += PerlIOBase_unread(aTHX_ f, vbuf, count);
14a5cf38
JH		 3224 }
3225 return unread;
9e353e3b
NIS		 3226}
3227
3228SSize_t
f62ce20a 3229PerlIOStdio_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 3230{
97aff369 3231 dVAR;
4d948241
NIS		 3232 SSize_t got;
3233 for (;;) {
3234 got = PerlSIO_fwrite(vbuf, 1, count,
3235 PerlIOSelf(f, PerlIOStdio)->stdio);
42a7a32f 3236 if (got >= 0 || errno != EINTR)
4d948241
NIS		 3237 break;
3238 PERL_ASYNC_CHECK();
42a7a32f 3239 SETERRNO(0,0); /* just in case */
4d948241
NIS		 3240 }
3241 return got;
9e353e3b
NIS		 3242}
3243
94a175e1 3244IV
f62ce20a 3245PerlIOStdio_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
9e353e3b 3246{
c4420975 3247 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
96a5add6
AL		 3248 PERL_UNUSED_CONTEXT;
3249
94a175e1 3250 return PerlSIO_fseek(stdio, offset, whence);
9e353e3b
NIS		 3251}
3252
3253Off_t
f62ce20a 3254PerlIOStdio_tell(pTHX_ PerlIO *f)
9e353e3b 3255{
c4420975 3256 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
96a5add6
AL		 3257 PERL_UNUSED_CONTEXT;
3258
94a175e1 3259 return PerlSIO_ftell(stdio);
9e353e3b
NIS		 3260}
3261
3262IV
f62ce20a 3263PerlIOStdio_flush(pTHX_ PerlIO *f)
9e353e3b 3264{
c4420975 3265 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
96a5add6
AL		 3266 PERL_UNUSED_CONTEXT;
3267
14a5cf38
JH		 3268 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
3269 return PerlSIO_fflush(stdio);
3270 }
3271 else {
6f207bd3 3272 NOOP;
88b61e10 3273#if 0
14a5cf38
JH		 3274 /*
3275 * FIXME: This discards ungetc() and pre-read stuff which is not
71200d45 3276 * right if this is just a "sync" from a layer above Suspect right
14a5cf38 3277 * design is to do _this_ but not have layer above flush this
71200d45 3278 * layer read-to-read
14a5cf38
JH		 3279 */
3280 /*
71200d45 3281 * Not writeable - sync by attempting a seek
14a5cf38 3282 */
79852593 3283 const int err = errno;
14a5cf38
JH		 3284 if (PerlSIO_fseek(stdio, (Off_t) 0, SEEK_CUR) != 0)
3285 errno = err;
88b61e10 3286#endif
14a5cf38
JH		 3287 }
3288 return 0;
9e353e3b
NIS		 3289}
3290
3291IV
f62ce20a 3292PerlIOStdio_eof(pTHX_ PerlIO *f)
9e353e3b 3293{
96a5add6
AL		 3294 PERL_UNUSED_CONTEXT;
3295
14a5cf38 3296 return PerlSIO_feof(PerlIOSelf(f, PerlIOStdio)->stdio);
9e353e3b
NIS		 3297}
3298
3299IV
f62ce20a 3300PerlIOStdio_error(pTHX_ PerlIO *f)
9e353e3b 3301{
96a5add6
AL		 3302 PERL_UNUSED_CONTEXT;
3303
263df5f1 3304 return PerlSIO_ferror(PerlIOSelf(f, PerlIOStdio)->stdio);
9e353e3b
NIS		 3305}
3306
3307void
f62ce20a 3308PerlIOStdio_clearerr(pTHX_ PerlIO *f)
9e353e3b 3309{
96a5add6
AL		 3310 PERL_UNUSED_CONTEXT;
3311
14a5cf38 3312 PerlSIO_clearerr(PerlIOSelf(f, PerlIOStdio)->stdio);
9e353e3b
NIS		 3313}
3314
3315void
f62ce20a 3316PerlIOStdio_setlinebuf(pTHX_ PerlIO *f)
9e353e3b 3317{
96a5add6
AL		 3318 PERL_UNUSED_CONTEXT;
3319
9e353e3b 3320#ifdef HAS_SETLINEBUF
14a5cf38 3321 PerlSIO_setlinebuf(PerlIOSelf(f, PerlIOStdio)->stdio);
9e353e3b 3322#else
bd61b366 3323 PerlSIO_setvbuf(PerlIOSelf(f, PerlIOStdio)->stdio, NULL, _IOLBF, 0);
9e353e3b
NIS		 3324#endif
3325}
3326
3327#ifdef FILE_base
3328STDCHAR *
f62ce20a 3329PerlIOStdio_get_base(pTHX_ PerlIO *f)
9e353e3b 3330{
c4420975 3331 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
cc00df79 3332 return (STDCHAR*)PerlSIO_get_base(stdio);
9e353e3b
NIS		 3333}
3334
3335Size_t
f62ce20a 3336PerlIOStdio_get_bufsiz(pTHX_ PerlIO *f)
9e353e3b 3337{
c4420975 3338 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
14a5cf38 3339 return PerlSIO_get_bufsiz(stdio);
9e353e3b
NIS		 3340}
3341#endif
3342
3343#ifdef USE_STDIO_PTR
3344STDCHAR *
f62ce20a 3345PerlIOStdio_get_ptr(pTHX_ PerlIO *f)
9e353e3b 3346{
c4420975 3347 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
cc00df79 3348 return (STDCHAR*)PerlSIO_get_ptr(stdio);
9e353e3b
NIS		 3349}
3350
3351SSize_t
f62ce20a 3352PerlIOStdio_get_cnt(pTHX_ PerlIO *f)
9e353e3b 3353{
c4420975 3354 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
14a5cf38 3355 return PerlSIO_get_cnt(stdio);
9e353e3b
NIS		 3356}
3357
3358void
f62ce20a 3359PerlIOStdio_set_ptrcnt(pTHX_ PerlIO *f, STDCHAR * ptr, SSize_t cnt)
9e353e3b 3360{
c4420975 3361 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
14a5cf38 3362 if (ptr != NULL) {
9e353e3b 3363#ifdef STDIO_PTR_LVALUE
22569500 3364 PerlSIO_set_ptr(stdio, (void*)ptr); /* LHS STDCHAR* cast non-portable */
9e353e3b 3365#ifdef STDIO_PTR_LVAL_SETS_CNT
14a5cf38 3366 if (PerlSIO_get_cnt(stdio) != (cnt)) {
14a5cf38
JH		 3367 assert(PerlSIO_get_cnt(stdio) == (cnt));
3368 }
9e353e3b
NIS		 3369#endif
3370#if (!defined(STDIO_PTR_LVAL_NOCHANGE_CNT))
14a5cf38 3371 /*
71200d45 3372 * Setting ptr _does_ change cnt - we are done
14a5cf38
JH		 3373 */
3374 return;
9e353e3b 3375#endif
22569500 3376#else /* STDIO_PTR_LVALUE */
14a5cf38 3377 PerlProc_abort();
22569500 3378#endif /* STDIO_PTR_LVALUE */
14a5cf38
JH		 3379 }
3380 /*
71200d45 3381 * Now (or only) set cnt
14a5cf38 3382 */
9e353e3b 3383#ifdef STDIO_CNT_LVALUE
14a5cf38 3384 PerlSIO_set_cnt(stdio, cnt);
22569500 3385#else /* STDIO_CNT_LVALUE */
9e353e3b 3386#if (defined(STDIO_PTR_LVALUE) && defined(STDIO_PTR_LVAL_SETS_CNT))
14a5cf38
JH		 3387 PerlSIO_set_ptr(stdio,
3388 PerlSIO_get_ptr(stdio) + (PerlSIO_get_cnt(stdio) -
3389 cnt));
22569500 3390#else /* STDIO_PTR_LVAL_SETS_CNT */
14a5cf38 3391 PerlProc_abort();
22569500
NIS		 3392#endif /* STDIO_PTR_LVAL_SETS_CNT */
3393#endif /* STDIO_CNT_LVALUE */
9e353e3b
NIS		 3394}
3395
93679785 3396
9e353e3b
NIS		 3397#endif
3398
93679785
NIS		 3399IV
3400PerlIOStdio_fill(pTHX_ PerlIO *f)
3401{
c4420975 3402 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
93679785 3403 int c;
96a5add6
AL		 3404 PERL_UNUSED_CONTEXT;
3405
93679785
NIS		 3406 /*
3407 * fflush()ing read-only streams can cause trouble on some stdio-s
3408 */
3409 if ((PerlIOBase(f)->flags & PERLIO_F_CANWRITE)) {
3410 if (PerlSIO_fflush(stdio) != 0)
3411 return EOF;
3412 }
3413 c = PerlSIO_fgetc(stdio);
3414 if (c == EOF)
3415 return EOF;
3416
3417#if (defined(STDIO_PTR_LVALUE) && (defined(STDIO_CNT_LVALUE) || defined(STDIO_PTR_LVAL_SETS_CNT)))
313e59c8
NIS		 3418
3419#ifdef STDIO_BUFFER_WRITABLE
9f7cd136 3420 if (PerlIO_fast_gets(f) && PerlIO_has_base(f)) {
93679785
NIS		 3421 /* Fake ungetc() to the real buffer in case system's ungetc
3422 goes elsewhere
3423 */
3424 STDCHAR *base = (STDCHAR*)PerlSIO_get_base(stdio);
3425 SSize_t cnt = PerlSIO_get_cnt(stdio);
3426 STDCHAR *ptr = (STDCHAR*)PerlSIO_get_ptr(stdio);
3427 if (ptr == base+1) {
3428 *--ptr = (STDCHAR) c;
3429 PerlIOStdio_set_ptrcnt(aTHX_ f,ptr,cnt+1);
3430 if (PerlSIO_feof(stdio))
3431 PerlSIO_clearerr(stdio);
3432 return 0;
3433 }
3434 }
313e59c8
NIS		 3435 else
3436#endif
3437 if (PerlIO_has_cntptr(f)) {
9f7cd136
NIS		 3438 STDCHAR ch = c;
3439 if (PerlIOStdio_unread(aTHX_ f,&ch,1) == 1) {
3440 return 0;
3441 }
3442 }
93679785
NIS		 3443#endif
3444
3445#if defined(VMS)
3446 /* An ungetc()d char is handled separately from the regular
3447 * buffer, so we stuff it in the buffer ourselves.
3448 * Should never get called as should hit code above
3449 */
bad9695d
NIS		 3450 *(--((*stdio)->_ptr)) = (unsigned char) c;
3451 (*stdio)->_cnt++;
93679785
NIS		 3452#else
3453 /* If buffer snoop scheme above fails fall back to
9f7cd136 3454 using ungetc().
93679785
NIS		 3455 */
3456 if (PerlSIO_ungetc(c, stdio) != c)
3457 return EOF;
3458#endif
3459 return 0;
3460}
3461
3462
3463
27da23d5 3464PERLIO_FUNCS_DECL(PerlIO_stdio) = {
2dc2558e 3465 sizeof(PerlIO_funcs),
14a5cf38
JH		 3466 "stdio",
3467 sizeof(PerlIOStdio),
86e05cf2 3468 PERLIO_K_BUFFERED|PERLIO_K_RAW,
1fd8f4ce 3469 PerlIOStdio_pushed,
44798d05 3470 PerlIOBase_popped,
14a5cf38 3471 PerlIOStdio_open,
86e05cf2 3472 PerlIOBase_binmode, /* binmode */
14a5cf38
JH		 3473 NULL,
3474 PerlIOStdio_fileno,
71200d45 3475 PerlIOStdio_dup,
14a5cf38
JH		 3476 PerlIOStdio_read,
3477 PerlIOStdio_unread,
3478 PerlIOStdio_write,
3479 PerlIOStdio_seek,
3480 PerlIOStdio_tell,
3481 PerlIOStdio_close,
3482 PerlIOStdio_flush,
3483 PerlIOStdio_fill,
3484 PerlIOStdio_eof,
3485 PerlIOStdio_error,
3486 PerlIOStdio_clearerr,
3487 PerlIOStdio_setlinebuf,
9e353e3b 3488#ifdef FILE_base
14a5cf38
JH		 3489 PerlIOStdio_get_base,
3490 PerlIOStdio_get_bufsiz,
9e353e3b 3491#else
14a5cf38
JH		 3492 NULL,
3493 NULL,
9e353e3b
NIS		 3494#endif
3495#ifdef USE_STDIO_PTR
14a5cf38
JH		 3496 PerlIOStdio_get_ptr,
3497 PerlIOStdio_get_cnt,
15b61c98 3498# if defined(HAS_FAST_STDIO) && defined(USE_FAST_STDIO)
79ed0f43 3499 PerlIOStdio_set_ptrcnt,
15b61c98
JH		 3500# else
3501 NULL,
3502# endif /* HAS_FAST_STDIO && USE_FAST_STDIO */
3503#else
3504 NULL,
14a5cf38
JH		 3505 NULL,
3506 NULL,
15b61c98 3507#endif /* USE_STDIO_PTR */
9e353e3b
NIS		 3508};
3509
b9d6bf13
JH		 3510/* Note that calls to PerlIO_exportFILE() are reversed using
3511 * PerlIO_releaseFILE(), not importFILE. */
9e353e3b 3512FILE *
81428673 3513PerlIO_exportFILE(PerlIO * f, const char *mode)
9e353e3b 3514{
e87a358a 3515 dTHX;
81428673
NIS		 3516 FILE *stdio = NULL;
3517 if (PerlIOValid(f)) {
3518 char buf[8];
3519 PerlIO_flush(f);
3520 if (!mode || !*mode) {
3521 mode = PerlIO_modestr(f, buf);
3522 }
3523 stdio = PerlSIO_fdopen(PerlIO_fileno(f), mode);
3524 if (stdio) {
3525 PerlIOl *l = *f;
9f75cc58 3526 PerlIO *f2;
81428673
NIS		 3527 /* De-link any lower layers so new :stdio sticks */
3528 *f = NULL;
a0714e2c 3529 if ((f2 = PerlIO_push(aTHX_ f, PERLIO_FUNCS_CAST(&PerlIO_stdio), buf, NULL))) {
9f75cc58 3530 PerlIOStdio *s = PerlIOSelf((f = f2), PerlIOStdio);
81428673
NIS		 3531 s->stdio = stdio;
3532 /* Link previous lower layers under new one */
3533 *PerlIONext(f) = l;
3534 }
3535 else {
3536 /* restore layers list */
3537 *f = l;
3538 }
a33cf58c 3539 }
14a5cf38
JH		 3540 }
3541 return stdio;
9e353e3b
NIS		 3542}
3543
81428673 3544
9e353e3b
NIS		 3545FILE *
3546PerlIO_findFILE(PerlIO *f)
3547{
14a5cf38
JH		 3548 PerlIOl *l = *f;
3549 while (l) {
3550 if (l->tab == &PerlIO_stdio) {
3551 PerlIOStdio *s = PerlIOSelf(&l, PerlIOStdio);
3552 return s->stdio;
3553 }
3554 l = *PerlIONext(&l);
f7e7eb72 3555 }
4b069b44 3556 /* Uses fallback "mode" via PerlIO_modestr() in PerlIO_exportFILE */
bd61b366 3557 return PerlIO_exportFILE(f, NULL);
9e353e3b
NIS		 3558}
3559
b9d6bf13 3560/* Use this to reverse PerlIO_exportFILE calls. */
9e353e3b
NIS		 3561void
3562PerlIO_releaseFILE(PerlIO *p, FILE *f)
3563{
27da23d5 3564 dVAR;
22569500
NIS		 3565 PerlIOl *l;
3566 while ((l = *p)) {
3567 if (l->tab == &PerlIO_stdio) {
3568 PerlIOStdio *s = PerlIOSelf(&l, PerlIOStdio);
3569 if (s->stdio == f) {
3570 dTHX;
3571 PerlIO_pop(aTHX_ p);
3572 return;
3573 }
3574 }
3575 p = PerlIONext(p);
3576 }
3577 return;
9e353e3b
NIS		 3578}
3579
3580/*--------------------------------------------------------------------------------------*/
14a5cf38 3581/*