This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
reentr: update size after Renew
[perl5.git] / perlio.c
CommitLineData
14a5cf38 1/*
5cb43542
RGS
2 * perlio.c
3 * Copyright (c) 1996-2006, Nick Ing-Simmons
2eee27d7 4 * Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011 Larry Wall and others
5cb43542
RGS
5 *
6 * You may distribute under the terms of either the GNU General Public License
7 * or the Artistic License, as specified in the README file.
760ac839
LW
8 */
9
14a5cf38 10/*
d31a8517
AT
11 * Hour after hour for nearly three weary days he had jogged up and down,
12 * over passes, and through long dales, and across many streams.
4ac71550
TC
13 *
14 * [pp.791-792 of _The Lord of the Rings_, V/iii: "The Muster of Rohan"]
d31a8517
AT
15 */
16
166f8a29
DM
17/* This file contains the functions needed to implement PerlIO, which
18 * is Perl's private replacement for the C stdio library. This is used
19 * by default unless you compile with -Uuseperlio or run with
20 * PERLIO=:stdio (but don't do this unless you know what you're doing)
21 */
22
d31a8517 23/*
71200d45 24 * If we have ActivePerl-like PERL_IMPLICIT_SYS then we need a dTHX to get
14a5cf38 25 * at the dispatch tables, even when we do not need it for other reasons.
71200d45 26 * Invent a dSYS macro to abstract this out
14a5cf38 27 */
7bcba3d4
NIS
28#ifdef PERL_IMPLICIT_SYS
29#define dSYS dTHX
30#else
31#define dSYS dNOOP
32#endif
33
6f9d8c32 34#define PERLIO_NOT_STDIO 0
760ac839 35/*
6f9d8c32 36 * This file provides those parts of PerlIO abstraction
88b61e10 37 * which are not #defined in perlio.h.
6f9d8c32 38 * Which these are depends on various Configure #ifdef's
760ac839
LW
39 */
40
41#include "EXTERN.h"
864dbfa3 42#define PERL_IN_PERLIO_C
760ac839
LW
43#include "perl.h"
44
32af7c23
CL
45#ifdef PERL_IMPLICIT_CONTEXT
46#undef dSYS
47#define dSYS dTHX
48#endif
49
0c4f7ff0
NIS
50#include "XSUB.h"
51
9cffb111
OS
52#ifdef __Lynx__
53/* Missing proto on LynxOS */
54int mkstemp(char*);
55#endif
56
25bbd826
CB
57#ifdef VMS
58#include <rms.h>
59#endif
60
abf9167d
DM
61#define PerlIO_lockcnt(f) (((PerlIOl*)(f))->head->flags)
62
1b7a0411 63/* Call the callback or PerlIOBase, and return failure. */
b32dd47e 64#define Perl_PerlIO_or_Base(f, callback, base, failure, args) \
1b7a0411 65 if (PerlIOValid(f)) { \
46c461b5 66 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
1b7a0411
JH
67 if (tab && tab->callback) \
68 return (*tab->callback) args; \
69 else \
70 return PerlIOBase_ ## base args; \
71 } \
72 else \
73 SETERRNO(EBADF, SS_IVCHAN); \
74 return failure
75
76/* Call the callback or fail, and return failure. */
b32dd47e 77#define Perl_PerlIO_or_fail(f, callback, failure, args) \
1b7a0411 78 if (PerlIOValid(f)) { \
46c461b5 79 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
1b7a0411
JH
80 if (tab && tab->callback) \
81 return (*tab->callback) args; \
82 SETERRNO(EINVAL, LIB_INVARG); \
83 } \
84 else \
85 SETERRNO(EBADF, SS_IVCHAN); \
86 return failure
87
88/* Call the callback or PerlIOBase, and be void. */
b32dd47e 89#define Perl_PerlIO_or_Base_void(f, callback, base, args) \
1b7a0411 90 if (PerlIOValid(f)) { \
46c461b5 91 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
1b7a0411
JH
92 if (tab && tab->callback) \
93 (*tab->callback) args; \
94 else \
95 PerlIOBase_ ## base args; \
1b7a0411
JH
96 } \
97 else \
98 SETERRNO(EBADF, SS_IVCHAN)
99
100/* Call the callback or fail, and be void. */
b32dd47e 101#define Perl_PerlIO_or_fail_void(f, callback, args) \
1b7a0411 102 if (PerlIOValid(f)) { \
46c461b5 103 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;\
1b7a0411
JH
104 if (tab && tab->callback) \
105 (*tab->callback) args; \
37725cdc
NIS
106 else \
107 SETERRNO(EINVAL, LIB_INVARG); \
1b7a0411
JH
108 } \
109 else \
110 SETERRNO(EBADF, SS_IVCHAN)
111
89a3a251
JH
112#if defined(__osf__) && _XOPEN_SOURCE < 500
113extern int fseeko(FILE *, off_t, int);
114extern off_t ftello(FILE *);
115#endif
116
76e6dc3a
KW
117#define NATIVE_0xd CR_NATIVE
118#define NATIVE_0xa LF_NATIVE
119
a0c21aa1
JH
120EXTERN_C int perlsio_binmode(FILE *fp, int iotype, int mode);
121
71ab4674
SP
122int
123perlsio_binmode(FILE *fp, int iotype, int mode)
124{
125 /*
126 * This used to be contents of do_binmode in doio.c
127 */
128#ifdef DOSISH
71ab4674 129 dTHX;
58c0efa5 130 PERL_UNUSED_ARG(iotype);
71ab4674
SP
131#ifdef NETWARE
132 if (PerlLIO_setmode(fp, mode) != -1) {
133#else
134 if (PerlLIO_setmode(fileno(fp), mode) != -1) {
135#endif
71ab4674
SP
136 return 1;
137 }
138 else
139 return 0;
71ab4674
SP
140#else
141# if defined(USEMYBINMODE)
142 dTHX;
58c0efa5
RGS
143# if defined(__CYGWIN__)
144 PERL_UNUSED_ARG(iotype);
145# endif
71ab4674
SP
146 if (my_binmode(fp, iotype, mode) != FALSE)
147 return 1;
148 else
149 return 0;
150# else
151 PERL_UNUSED_ARG(fp);
152 PERL_UNUSED_ARG(iotype);
153 PERL_UNUSED_ARG(mode);
154 return 1;
155# endif
156#endif
157}
71ab4674 158
06c7082d 159#ifndef O_ACCMODE
22569500 160#define O_ACCMODE 3 /* Assume traditional implementation */
06c7082d
NIS
161#endif
162
163int
164PerlIO_intmode2str(int rawmode, char *mode, int *writing)
165{
de009b76 166 const int result = rawmode & O_ACCMODE;
06c7082d
NIS
167 int ix = 0;
168 int ptype;
169 switch (result) {
170 case O_RDONLY:
171 ptype = IoTYPE_RDONLY;
172 break;
173 case O_WRONLY:
174 ptype = IoTYPE_WRONLY;
175 break;
176 case O_RDWR:
177 default:
178 ptype = IoTYPE_RDWR;
179 break;
180 }
181 if (writing)
182 *writing = (result != O_RDONLY);
183
184 if (result == O_RDONLY) {
185 mode[ix++] = 'r';
186 }
187#ifdef O_APPEND
188 else if (rawmode & O_APPEND) {
189 mode[ix++] = 'a';
190 if (result != O_WRONLY)
191 mode[ix++] = '+';
192 }
193#endif
194 else {
195 if (result == O_WRONLY)
196 mode[ix++] = 'w';
197 else {
198 mode[ix++] = 'r';
199 mode[ix++] = '+';
200 }
201 }
43e5477e
JH
202#if O_BINARY != 0
203 /* Unless O_BINARY is different from zero, bit-and:ing
204 * with it won't do much good. */
06c7082d
NIS
205 if (rawmode & O_BINARY)
206 mode[ix++] = 'b';
43e5477e 207# endif
06c7082d
NIS
208 mode[ix] = '\0';
209 return ptype;
210}
211
eb73beca
NIS
212#ifndef PERLIO_LAYERS
213int
214PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
215{
6874a2de
NIS
216 if (!names || !*names
217 || strEQ(names, ":crlf")
218 || strEQ(names, ":raw")
219 || strEQ(names, ":bytes")
220 ) {
14a5cf38
JH
221 return 0;
222 }
223 Perl_croak(aTHX_ "Cannot apply \"%s\" in non-PerlIO perl", names);
224 /*
71200d45 225 * NOTREACHED
14a5cf38
JH
226 */
227 return -1;
eb73beca
NIS
228}
229
13621cfb
NIS
230void
231PerlIO_destruct(pTHX)
232{
233}
234
f5b9d040
NIS
235int
236PerlIO_binmode(pTHX_ PerlIO *fp, int iotype, int mode, const char *names)
237{
14a5cf38 238 return perlsio_binmode(fp, iotype, mode);
f5b9d040 239}
60382766 240
e0fa5af2 241PerlIO *
ecdeb87c 242PerlIO_fdupopen(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
e0fa5af2 243{
a0fd4948 244#if defined(PERL_MICRO) || defined(__SYMBIAN32__)
0553478e
NIS
245 return NULL;
246#else
247#ifdef PERL_IMPLICIT_SYS
22569500 248 return PerlSIO_fdupopen(f);
0553478e 249#else
30753f56
NIS
250#ifdef WIN32
251 return win32_fdupopen(f);
252#else
e0fa5af2 253 if (f) {
504618e9 254 const int fd = PerlLIO_dup(PerlIO_fileno(f));
e0fa5af2 255 if (fd >= 0) {
06c7082d 256 char mode[8];
a5936e02 257#ifdef DJGPP
dcda55fc
AL
258 const int omode = djgpp_get_stream_mode(f);
259#else
260 const int omode = fcntl(fd, F_GETFL);
a5936e02 261#endif
06c7082d 262 PerlIO_intmode2str(omode,mode,NULL);
e0fa5af2 263 /* the r+ is a hack */
06c7082d 264 return PerlIO_fdopen(fd, mode);
e0fa5af2
NIS
265 }
266 return NULL;
267 }
268 else {
93189314 269 SETERRNO(EBADF, SS_IVCHAN);
e0fa5af2 270 }
7114a2d2 271#endif
e0fa5af2 272 return NULL;
0553478e 273#endif
30753f56 274#endif
e0fa5af2
NIS
275}
276
277
14a5cf38 278/*
71200d45 279 * De-mux PerlIO_openn() into fdopen, freopen and fopen type entries
14a5cf38 280 */
ee518936
NIS
281
282PerlIO *
14a5cf38
JH
283PerlIO_openn(pTHX_ const char *layers, const char *mode, int fd,
284 int imode, int perm, PerlIO *old, int narg, SV **args)
285{
7cf31beb
NIS
286 if (narg) {
287 if (narg > 1) {
3b8752bb 288 Perl_croak(aTHX_ "More than one argument to open");
7cf31beb 289 }
14a5cf38
JH
290 if (*args == &PL_sv_undef)
291 return PerlIO_tmpfile();
292 else {
41188aa0 293 STRLEN len;
74622586 294 const char *name = SvPV_const(*args, len);
41188aa0 295 if (!IS_SAFE_PATHNAME(name, len, "open"))
c8028aa6
TC
296 return NULL;
297
3b6c1aba 298 if (*mode == IoTYPE_NUMERIC) {
14a5cf38
JH
299 fd = PerlLIO_open3(name, imode, perm);
300 if (fd >= 0)
de009b76 301 return PerlIO_fdopen(fd, mode + 1);
14a5cf38
JH
302 }
303 else if (old) {
304 return PerlIO_reopen(name, mode, old);
305 }
306 else {
307 return PerlIO_open(name, mode);
308 }
309 }
310 }
311 else {
312 return PerlIO_fdopen(fd, (char *) mode);
313 }
314 return NULL;
ee518936
NIS
315}
316
15eb3045 317XS(XS_PerlIO__Layer__find); /* prototype to pass -Wmissing-prototypes */
0c4f7ff0
NIS
318XS(XS_PerlIO__Layer__find)
319{
14a5cf38
JH
320 dXSARGS;
321 if (items < 2)
322 Perl_croak(aTHX_ "Usage class->find(name[,load])");
323 else {
dcda55fc 324 const char * const name = SvPV_nolen_const(ST(1));
14a5cf38
JH
325 ST(0) = (strEQ(name, "crlf")
326 || strEQ(name, "raw")) ? &PL_sv_yes : &PL_sv_undef;
327 XSRETURN(1);
328 }
0c4f7ff0
NIS
329}
330
331
332void
333Perl_boot_core_PerlIO(pTHX)
334{
14a5cf38 335 newXS("PerlIO::Layer::find", XS_PerlIO__Layer__find, __FILE__);
0c4f7ff0
NIS
336}
337
ac27b0f5
NIS
338#endif
339
32e30700 340
6f9d8c32 341/*======================================================================================*/
14a5cf38 342/*
71200d45 343 * Implement all the PerlIO interface ourselves.
9e353e3b 344 */
760ac839 345
76ced9ad
NIS
346#include "perliol.h"
347
6f9d8c32 348void
14a5cf38
JH
349PerlIO_debug(const char *fmt, ...)
350{
14a5cf38
JH
351 va_list ap;
352 dSYS;
e17bc05a
TC
353
354 if (!DEBUG_i_TEST)
355 return;
356
d732c5e5
JH
357 va_start(ap, fmt);
358
582588d2 359 if (!PL_perlio_debug_fd) {
284167a5 360 if (!TAINTING_get &&
985213f2
AB
361 PerlProc_getuid() == PerlProc_geteuid() &&
362 PerlProc_getgid() == PerlProc_getegid()) {
582588d2
NC
363 const char * const s = PerlEnv_getenv("PERLIO_DEBUG");
364 if (s && *s)
365 PL_perlio_debug_fd
366 = PerlLIO_open3(s, O_WRONLY | O_CREAT | O_APPEND, 0666);
367 else
64320867 368 PL_perlio_debug_fd = PerlLIO_dup(2); /* stderr */
582588d2 369 } else {
64320867
TC
370 /* tainting or set*id, so ignore the environment and send the
371 debug output to stderr, like other -D switches. */
372 PL_perlio_debug_fd = PerlLIO_dup(2); /* stderr */
582588d2 373 }
14a5cf38 374 }
27da23d5 375 if (PL_perlio_debug_fd > 0) {
70ace5da 376#ifdef USE_ITHREADS
dcda55fc 377 const char * const s = CopFILE(PL_curcop);
70ace5da
NIS
378 /* Use fixed buffer as sv_catpvf etc. needs SVs */
379 char buffer[1024];
1208b3dd
JH
380 const STRLEN len1 = my_snprintf(buffer, sizeof(buffer), "%.40s:%" IVdf " ", s ? s : "(none)", (IV) CopLINE(PL_curcop));
381 const STRLEN len2 = my_vsnprintf(buffer + len1, sizeof(buffer) - len1, fmt, ap);
b469f1e0 382 PERL_UNUSED_RESULT(PerlLIO_write(PL_perlio_debug_fd, buffer, len1 + len2));
70ace5da 383#else
dcda55fc
AL
384 const char *s = CopFILE(PL_curcop);
385 STRLEN len;
550e2ce0
NC
386 SV * const sv = Perl_newSVpvf(aTHX_ "%s:%" IVdf " ", s ? s : "(none)",
387 (IV) CopLINE(PL_curcop));
14a5cf38
JH
388 Perl_sv_vcatpvf(aTHX_ sv, fmt, &ap);
389
b83604b4 390 s = SvPV_const(sv, len);
b469f1e0 391 PERL_UNUSED_RESULT(PerlLIO_write(PL_perlio_debug_fd, s, len));
14a5cf38 392 SvREFCNT_dec(sv);
70ace5da 393#endif
14a5cf38
JH
394 }
395 va_end(ap);
6f9d8c32
NIS
396}
397
9e353e3b
NIS
398/*--------------------------------------------------------------------------------------*/
399
14a5cf38 400/*
71200d45 401 * Inner level routines
14a5cf38 402 */
9e353e3b 403
16865ff7
DM
404/* check that the head field of each layer points back to the head */
405
406#ifdef DEBUGGING
407# define VERIFY_HEAD(f) PerlIO_verify_head(aTHX_ f)
408static void
409PerlIO_verify_head(pTHX_ PerlIO *f)
410{
411 PerlIOl *head, *p;
412 int seen = 0;
dd791c72
JH
413#ifndef PERL_IMPLICIT_SYS
414 PERL_UNUSED_CONTEXT;
415#endif
16865ff7
DM
416 if (!PerlIOValid(f))
417 return;
418 p = head = PerlIOBase(f)->head;
419 assert(p);
420 do {
421 assert(p->head == head);
422 if (p == (PerlIOl*)f)
423 seen = 1;
424 p = p->next;
425 } while (p);
426 assert(seen);
427}
428#else
429# define VERIFY_HEAD(f)
430#endif
431
432
14a5cf38 433/*
71200d45 434 * Table of pointers to the PerlIO structs (malloc'ed)
14a5cf38 435 */
05d1247b 436#define PERLIO_TABLE_SIZE 64
6f9d8c32 437
8995e67d
DM
438static void
439PerlIO_init_table(pTHX)
440{
441 if (PL_perlio)
442 return;
443 Newxz(PL_perlio, PERLIO_TABLE_SIZE, PerlIOl);
444}
445
446
447
760ac839 448PerlIO *
5f1a76d0 449PerlIO_allocate(pTHX)
6f9d8c32 450{
14a5cf38 451 /*
71200d45 452 * Find a free slot in the table, allocating new table as necessary
14a5cf38 453 */
303f2dc3
DM
454 PerlIOl **last;
455 PerlIOl *f;
a1ea730d 456 last = &PL_perlio;
14a5cf38
JH
457 while ((f = *last)) {
458 int i;
303f2dc3 459 last = (PerlIOl **) (f);
14a5cf38 460 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
303f2dc3 461 if (!((++f)->next)) {
4e0ef342 462 goto good_exit;
14a5cf38
JH
463 }
464 }
465 }
303f2dc3 466 Newxz(f,PERLIO_TABLE_SIZE,PerlIOl);
14a5cf38
JH
467 if (!f) {
468 return NULL;
469 }
303f2dc3 470 *last = (PerlIOl*) f++;
4e0ef342
DD
471
472 good_exit:
abf9167d 473 f->flags = 0; /* lockcnt */
303f2dc3 474 f->tab = NULL;
16865ff7 475 f->head = f;
303f2dc3 476 return (PerlIO*) f;
05d1247b
NIS
477}
478
a1ea730d
NIS
479#undef PerlIO_fdupopen
480PerlIO *
ecdeb87c 481PerlIO_fdupopen(pTHX_ PerlIO *f, CLONE_PARAMS *param, int flags)
a1ea730d 482{
04892f78 483 if (PerlIOValid(f)) {
de009b76 484 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
e17bc05a 485 DEBUG_i( PerlIO_debug("fdupopen f=%p param=%p\n",(void*)f,(void*)param) );
210e727c
JH
486 if (tab && tab->Dup)
487 return (*tab->Dup)(aTHX_ PerlIO_allocate(aTHX), f, param, flags);
37725cdc
NIS
488 else {
489 return PerlIOBase_dup(aTHX_ PerlIO_allocate(aTHX), f, param, flags);
490 }
a1ea730d 491 }
210e727c
JH
492 else
493 SETERRNO(EBADF, SS_IVCHAN);
494
495 return NULL;
a1ea730d
NIS
496}
497
498void
303f2dc3 499PerlIO_cleantable(pTHX_ PerlIOl **tablep)
05d1247b 500{
303f2dc3 501 PerlIOl * const table = *tablep;
14a5cf38
JH
502 if (table) {
503 int i;
303f2dc3 504 PerlIO_cleantable(aTHX_(PerlIOl **) & (table[0]));
14a5cf38 505 for (i = PERLIO_TABLE_SIZE - 1; i > 0; i--) {
303f2dc3
DM
506 PerlIOl * const f = table + i;
507 if (f->next) {
508 PerlIO_close(&(f->next));
14a5cf38
JH
509 }
510 }
3a1ee7e8 511 Safefree(table);
14a5cf38 512 *tablep = NULL;
05d1247b 513 }
05d1247b
NIS
514}
515
fcf2db38
NIS
516
517PerlIO_list_t *
3a1ee7e8 518PerlIO_list_alloc(pTHX)
fcf2db38 519{
14a5cf38 520 PerlIO_list_t *list;
96a5add6 521 PERL_UNUSED_CONTEXT;
a02a5408 522 Newxz(list, 1, PerlIO_list_t);
14a5cf38
JH
523 list->refcnt = 1;
524 return list;
fcf2db38
NIS
525}
526
527void
3a1ee7e8 528PerlIO_list_free(pTHX_ PerlIO_list_t *list)
fcf2db38 529{
14a5cf38
JH
530 if (list) {
531 if (--list->refcnt == 0) {
532 if (list->array) {
14a5cf38 533 IV i;
ef8d46e8
VP
534 for (i = 0; i < list->cur; i++)
535 SvREFCNT_dec(list->array[i].arg);
14a5cf38
JH
536 Safefree(list->array);
537 }
538 Safefree(list);
539 }
540 }
fcf2db38
NIS
541}
542
543void
3a1ee7e8 544PerlIO_list_push(pTHX_ PerlIO_list_t *list, PerlIO_funcs *funcs, SV *arg)
14a5cf38 545{
334e202e 546 PerlIO_pair_t *p;
b37c2d43
AL
547 PERL_UNUSED_CONTEXT;
548
14a5cf38
JH
549 if (list->cur >= list->len) {
550 list->len += 8;
551 if (list->array)
552 Renew(list->array, list->len, PerlIO_pair_t);
553 else
a02a5408 554 Newx(list->array, list->len, PerlIO_pair_t);
14a5cf38
JH
555 }
556 p = &(list->array[list->cur++]);
557 p->funcs = funcs;
558 if ((p->arg = arg)) {
f84c484e 559 SvREFCNT_inc_simple_void_NN(arg);
14a5cf38 560 }
fcf2db38
NIS
561}
562
3a1ee7e8
NIS
563PerlIO_list_t *
564PerlIO_clone_list(pTHX_ PerlIO_list_t *proto, CLONE_PARAMS *param)
565{
b37c2d43 566 PerlIO_list_t *list = NULL;
694c95cf
JH
567 if (proto) {
568 int i;
569 list = PerlIO_list_alloc(aTHX);
570 for (i=0; i < proto->cur; i++) {
a951d81d 571 SV *arg = proto->array[i].arg;
24d147a6 572#ifdef USE_ITHREADS
a951d81d
BL
573 if (arg && param)
574 arg = sv_dup(arg, param);
575#else
576 PERL_UNUSED_ARG(param);
577#endif
694c95cf
JH
578 PerlIO_list_push(aTHX_ list, proto->array[i].funcs, arg);
579 }
3a1ee7e8
NIS
580 }
581 return list;
582}
4a4a6116 583
05d1247b 584void
3a1ee7e8 585PerlIO_clone(pTHX_ PerlInterpreter *proto, CLONE_PARAMS *param)
9a6404c5 586{
3aaf42a7 587#ifdef USE_ITHREADS
303f2dc3
DM
588 PerlIOl **table = &proto->Iperlio;
589 PerlIOl *f;
3a1ee7e8
NIS
590 PL_perlio = NULL;
591 PL_known_layers = PerlIO_clone_list(aTHX_ proto->Iknown_layers, param);
592 PL_def_layerlist = PerlIO_clone_list(aTHX_ proto->Idef_layerlist, param);
8995e67d 593 PerlIO_init_table(aTHX);
e17bc05a 594 DEBUG_i( PerlIO_debug("Clone %p from %p\n",(void*)aTHX,(void*)proto) );
3a1ee7e8
NIS
595 while ((f = *table)) {
596 int i;
303f2dc3 597 table = (PerlIOl **) (f++);
3a1ee7e8 598 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
303f2dc3
DM
599 if (f->next) {
600 (void) fp_dup(&(f->next), 0, param);
3a1ee7e8
NIS
601 }
602 f++;
603 }
604 }
1b6737cc 605#else
a25429c6 606 PERL_UNUSED_CONTEXT;
1b6737cc
AL
607 PERL_UNUSED_ARG(proto);
608 PERL_UNUSED_ARG(param);
3aaf42a7 609#endif
9a6404c5
DM
610}
611
612void
13621cfb
NIS
613PerlIO_destruct(pTHX)
614{
303f2dc3
DM
615 PerlIOl **table = &PL_perlio;
616 PerlIOl *f;
694c95cf 617#ifdef USE_ITHREADS
e17bc05a 618 DEBUG_i( PerlIO_debug("Destruct %p\n",(void*)aTHX) );
694c95cf 619#endif
14a5cf38
JH
620 while ((f = *table)) {
621 int i;
303f2dc3 622 table = (PerlIOl **) (f++);
14a5cf38 623 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
303f2dc3 624 PerlIO *x = &(f->next);
dcda55fc 625 const PerlIOl *l;
14a5cf38 626 while ((l = *x)) {
cc6623a8 627 if (l->tab && l->tab->kind & PERLIO_K_DESTRUCT) {
e17bc05a 628 DEBUG_i( PerlIO_debug("Destruct popping %s\n", l->tab->name) );
14a5cf38
JH
629 PerlIO_flush(x);
630 PerlIO_pop(aTHX_ x);
631 }
632 else {
633 x = PerlIONext(x);
634 }
635 }
636 f++;
637 }
638 }
13621cfb
NIS
639}
640
641void
a999f61b 642PerlIO_pop(pTHX_ PerlIO *f)
760ac839 643{
dcda55fc 644 const PerlIOl *l = *f;
16865ff7 645 VERIFY_HEAD(f);
14a5cf38 646 if (l) {
e17bc05a
TC
647 DEBUG_i( PerlIO_debug("PerlIO_pop f=%p %s\n", (void*)f,
648 l->tab ? l->tab->name : "(Null)") );
cc6623a8 649 if (l->tab && l->tab->Popped) {
14a5cf38
JH
650 /*
651 * If popped returns non-zero do not free its layer structure
652 * it has either done so itself, or it is shared and still in
71200d45 653 * use
14a5cf38 654 */
f62ce20a 655 if ((*l->tab->Popped) (aTHX_ f) != 0)
14a5cf38
JH
656 return;
657 }
abf9167d
DM
658 if (PerlIO_lockcnt(f)) {
659 /* we're in use; defer freeing the structure */
660 PerlIOBase(f)->flags = PERLIO_F_CLEARED;
661 PerlIOBase(f)->tab = NULL;
662 }
663 else {
664 *f = l->next;
665 Safefree(l);
666 }
667
a8c08ecd 668 }
6f9d8c32
NIS
669}
670
39f7a870
JH
671/* Return as an array the stack of layers on a filehandle. Note that
672 * the stack is returned top-first in the array, and there are three
673 * times as many array elements as there are layers in the stack: the
674 * first element of a layer triplet is the name, the second one is the
675 * arguments, and the third one is the flags. */
676
677AV *
678PerlIO_get_layers(pTHX_ PerlIO *f)
679{
dcda55fc 680 AV * const av = newAV();
39f7a870 681
dcda55fc
AL
682 if (PerlIOValid(f)) {
683 PerlIOl *l = PerlIOBase(f);
684
685 while (l) {
92e45a3e
NC
686 /* There is some collusion in the implementation of
687 XS_PerlIO_get_layers - it knows that name and flags are
688 generated as fresh SVs here, and takes advantage of that to
689 "copy" them by taking a reference. If it changes here, it needs
690 to change there too. */
dcda55fc
AL
691 SV * const name = l->tab && l->tab->name ?
692 newSVpv(l->tab->name, 0) : &PL_sv_undef;
693 SV * const arg = l->tab && l->tab->Getarg ?
694 (*l->tab->Getarg)(aTHX_ &l, 0, 0) : &PL_sv_undef;
695 av_push(av, name);
696 av_push(av, arg);
697 av_push(av, newSViv((IV)l->flags));
698 l = l->next;
699 }
700 }
39f7a870 701
dcda55fc 702 return av;
39f7a870
JH
703}
704
9e353e3b 705/*--------------------------------------------------------------------------------------*/
14a5cf38 706/*
71200d45 707 * XS Interface for perl code
14a5cf38 708 */
9e353e3b 709
fcf2db38 710PerlIO_funcs *
2edd7e44 711PerlIO_find_layer(pTHX_ const char *name, STRLEN len, int load)
f3862f8b 712{
20b7effb 713
14a5cf38
JH
714 IV i;
715 if ((SSize_t) len <= 0)
716 len = strlen(name);
3a1ee7e8 717 for (i = 0; i < PL_known_layers->cur; i++) {
46c461b5 718 PerlIO_funcs * const f = PL_known_layers->array[i].funcs;
ba90859e
NC
719 const STRLEN this_len = strlen(f->name);
720 if (this_len == len && memEQ(f->name, name, len)) {
e17bc05a 721 DEBUG_i( PerlIO_debug("%.*s => %p\n", (int) len, name, (void*)f) );
14a5cf38
JH
722 return f;
723 }
724 }
3a1ee7e8
NIS
725 if (load && PL_subname && PL_def_layerlist
726 && PL_def_layerlist->cur >= 2) {
d7a09b41
SR
727 if (PL_in_load_module) {
728 Perl_croak(aTHX_ "Recursive call to Perl_load_module in PerlIO_find_layer");
729 return NULL;
730 } else {
396482e1 731 SV * const pkgsv = newSVpvs("PerlIO");
46c461b5 732 SV * const layer = newSVpvn(name, len);
b96d8cd9 733 CV * const cv = get_cvs("PerlIO::Layer::NoWarnings", 0);
46c461b5 734 ENTER;
4fa7c2bf 735 SAVEBOOL(PL_in_load_module);
c9bca74a 736 if (cv) {
9cfa90c0 737 SAVEGENERICSV(PL_warnhook);
ad64d0ec 738 PL_warnhook = MUTABLE_SV((SvREFCNT_inc_simple_NN(cv)));
c9bca74a 739 }
4fa7c2bf 740 PL_in_load_module = TRUE;
d7a09b41
SR
741 /*
742 * The two SVs are magically freed by load_module
743 */
a0714e2c 744 Perl_load_module(aTHX_ 0, pkgsv, NULL, layer, NULL);
d7a09b41
SR
745 LEAVE;
746 return PerlIO_find_layer(aTHX_ name, len, 0);
747 }
14a5cf38 748 }
e17bc05a 749 DEBUG_i( PerlIO_debug("Cannot find %.*s\n", (int) len, name) );
14a5cf38 750 return NULL;
f3862f8b
NIS
751}
752
2a1bc955 753#ifdef USE_ATTRIBUTES_FOR_PERLIO
b13b2135
NIS
754
755static int
756perlio_mg_set(pTHX_ SV *sv, MAGIC *mg)
757{
14a5cf38 758 if (SvROK(sv)) {
159b6efe 759 IO * const io = GvIOn(MUTABLE_GV(SvRV(sv)));
dcda55fc
AL
760 PerlIO * const ifp = IoIFP(io);
761 PerlIO * const ofp = IoOFP(io);
be2597df
MHM
762 Perl_warn(aTHX_ "set %" SVf " %p %p %p",
763 SVfARG(sv), (void*)io, (void*)ifp, (void*)ofp);
14a5cf38
JH
764 }
765 return 0;
b13b2135
NIS
766}
767
768static int
769perlio_mg_get(pTHX_ SV *sv, MAGIC *mg)
770{
14a5cf38 771 if (SvROK(sv)) {
159b6efe 772 IO * const io = GvIOn(MUTABLE_GV(SvRV(sv)));
dcda55fc
AL
773 PerlIO * const ifp = IoIFP(io);
774 PerlIO * const ofp = IoOFP(io);
be2597df
MHM
775 Perl_warn(aTHX_ "get %" SVf " %p %p %p",
776 SVfARG(sv), (void*)io, (void*)ifp, (void*)ofp);
14a5cf38
JH
777 }
778 return 0;
b13b2135
NIS
779}
780
781static int
782perlio_mg_clear(pTHX_ SV *sv, MAGIC *mg)
783{
be2597df 784 Perl_warn(aTHX_ "clear %" SVf, SVfARG(sv));
14a5cf38 785 return 0;
b13b2135
NIS
786}
787
788static int
789perlio_mg_free(pTHX_ SV *sv, MAGIC *mg)
790{
be2597df 791 Perl_warn(aTHX_ "free %" SVf, SVfARG(sv));
14a5cf38 792 return 0;
b13b2135
NIS
793}
794
795MGVTBL perlio_vtab = {
14a5cf38
JH
796 perlio_mg_get,
797 perlio_mg_set,
22569500 798 NULL, /* len */
14a5cf38
JH
799 perlio_mg_clear,
800 perlio_mg_free
b13b2135
NIS
801};
802
15eb3045 803XS(XS_io_MODIFY_SCALAR_ATTRIBUTES); /* prototype to pass -Wmissing-prototypes */
b13b2135
NIS
804XS(XS_io_MODIFY_SCALAR_ATTRIBUTES)
805{
14a5cf38 806 dXSARGS;
dcda55fc
AL
807 SV * const sv = SvRV(ST(1));
808 AV * const av = newAV();
14a5cf38
JH
809 MAGIC *mg;
810 int count = 0;
811 int i;
ad64d0ec 812 sv_magic(sv, MUTABLE_SV(av), PERL_MAGIC_ext, NULL, 0);
14a5cf38
JH
813 SvRMAGICAL_off(sv);
814 mg = mg_find(sv, PERL_MAGIC_ext);
815 mg->mg_virtual = &perlio_vtab;
816 mg_magical(sv);
be2597df 817 Perl_warn(aTHX_ "attrib %" SVf, SVfARG(sv));
14a5cf38
JH
818 for (i = 2; i < items; i++) {
819 STRLEN len;
dcda55fc
AL
820 const char * const name = SvPV_const(ST(i), len);
821 SV * const layer = PerlIO_find_layer(aTHX_ name, len, 1);
14a5cf38 822 if (layer) {
b37c2d43 823 av_push(av, SvREFCNT_inc_simple_NN(layer));
14a5cf38
JH
824 }
825 else {
826 ST(count) = ST(i);
827 count++;
828 }
829 }
830 SvREFCNT_dec(av);
831 XSRETURN(count);
832}
833
b8fda935 834#endif /* USE_ATTRIBUTES_FOR_PERLIO */
2a1bc955 835
e3f3bf95
NIS
836SV *
837PerlIO_tab_sv(pTHX_ PerlIO_funcs *tab)
f3862f8b 838{
da51bb9b 839 HV * const stash = gv_stashpvs("PerlIO::Layer", GV_ADD);
46c461b5 840 SV * const sv = sv_bless(newRV_noinc(newSViv(PTR2IV(tab))), stash);
14a5cf38 841 return sv;
e3f3bf95
NIS
842}
843
15eb3045 844XS(XS_PerlIO__Layer__NoWarnings); /* prototype to pass -Wmissing-prototypes */
5ca1d77f 845XS(XS_PerlIO__Layer__NoWarnings)
c9bca74a 846{
486ec47a 847 /* This is used as a %SIG{__WARN__} handler to suppress warnings
c9bca74a
NIS
848 during loading of layers.
849 */
850 dXSARGS;
5347602a 851 PERL_UNUSED_VAR(items);
e17bc05a
TC
852 DEBUG_i(
853 if (items)
854 PerlIO_debug("warning:%s\n",SvPV_nolen_const(ST(0))) );
c9bca74a
NIS
855 XSRETURN(0);
856}
857
15eb3045 858XS(XS_PerlIO__Layer__find); /* prototype to pass -Wmissing-prototypes */
5ca1d77f 859XS(XS_PerlIO__Layer__find)
0c4f7ff0 860{
14a5cf38
JH
861 dXSARGS;
862 if (items < 2)
863 Perl_croak(aTHX_ "Usage class->find(name[,load])");
864 else {
de009b76 865 STRLEN len;
46c461b5 866 const char * const name = SvPV_const(ST(1), len);
f814d560 867 const bool load = (items > 2) ? SvTRUE_NN(ST(2)) : 0;
46c461b5 868 PerlIO_funcs * const layer = PerlIO_find_layer(aTHX_ name, len, load);
14a5cf38
JH
869 ST(0) =
870 (layer) ? sv_2mortal(PerlIO_tab_sv(aTHX_ layer)) :
871 &PL_sv_undef;
872 XSRETURN(1);
873 }
0c4f7ff0
NIS
874}
875
e3f3bf95
NIS
876void
877PerlIO_define_layer(pTHX_ PerlIO_funcs *tab)
878{
3a1ee7e8
NIS
879 if (!PL_known_layers)
880 PL_known_layers = PerlIO_list_alloc(aTHX);
a0714e2c 881 PerlIO_list_push(aTHX_ PL_known_layers, tab, NULL);
e17bc05a 882 DEBUG_i( PerlIO_debug("define %s %p\n", tab->name, (void*)tab) );
f3862f8b
NIS
883}
884
1141d9f8 885int
fcf2db38 886PerlIO_parse_layers(pTHX_ PerlIO_list_t *av, const char *names)
1141d9f8 887{
14a5cf38
JH
888 if (names) {
889 const char *s = names;
890 while (*s) {
891 while (isSPACE(*s) || *s == ':')
892 s++;
893 if (*s) {
894 STRLEN llen = 0;
895 const char *e = s;
bd61b366 896 const char *as = NULL;
14a5cf38
JH
897 STRLEN alen = 0;
898 if (!isIDFIRST(*s)) {
899 /*
900 * Message is consistent with how attribute lists are
901 * passed. Even though this means "foo : : bar" is
71200d45 902 * seen as an invalid separator character.
14a5cf38 903 */
de009b76 904 const char q = ((*s == '\'') ? '"' : '\'');
a2a5de95
NC
905 Perl_ck_warner(aTHX_ packWARN(WARN_LAYER),
906 "Invalid separator character %c%c%c in PerlIO layer specification %s",
907 q, *s, q, s);
93189314 908 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH
909 return -1;
910 }
911 do {
912 e++;
0eb30aeb 913 } while (isWORDCHAR(*e));
14a5cf38
JH
914 llen = e - s;
915 if (*e == '(') {
916 int nesting = 1;
917 as = ++e;
918 while (nesting) {
919 switch (*e++) {
920 case ')':
921 if (--nesting == 0)
922 alen = (e - 1) - as;
923 break;
924 case '(':
925 ++nesting;
926 break;
927 case '\\':
928 /*
929 * It's a nul terminated string, not allowed
930 * to \ the terminating null. Anything other
71200d45 931 * character is passed over.
14a5cf38
JH
932 */
933 if (*e++) {
934 break;
935 }
936 /*
71200d45 937 * Drop through
14a5cf38
JH
938 */
939 case '\0':
940 e--;
a2a5de95
NC
941 Perl_ck_warner(aTHX_ packWARN(WARN_LAYER),
942 "Argument list not closed for PerlIO layer \"%.*s\"",
943 (int) (e - s), s);
14a5cf38
JH
944 return -1;
945 default:
946 /*
71200d45 947 * boring.
14a5cf38
JH
948 */
949 break;
950 }
951 }
952 }
953 if (e > s) {
46c461b5 954 PerlIO_funcs * const layer =
14a5cf38
JH
955 PerlIO_find_layer(aTHX_ s, llen, 1);
956 if (layer) {
a951d81d
BL
957 SV *arg = NULL;
958 if (as)
959 arg = newSVpvn(as, alen);
3a1ee7e8 960 PerlIO_list_push(aTHX_ av, layer,
a951d81d 961 (arg) ? arg : &PL_sv_undef);
ef8d46e8 962 SvREFCNT_dec(arg);
14a5cf38
JH
963 }
964 else {
a2a5de95
NC
965 Perl_ck_warner(aTHX_ packWARN(WARN_LAYER), "Unknown PerlIO layer \"%.*s\"",
966 (int) llen, s);
14a5cf38
JH
967 return -1;
968 }
969 }
970 s = e;
971 }
972 }
973 }
974 return 0;
1141d9f8
NIS
975}
976
dfebf958 977void
fcf2db38 978PerlIO_default_buffer(pTHX_ PerlIO_list_t *av)
dfebf958 979{
27da23d5 980 PERLIO_FUNCS_DECL(*tab) = &PerlIO_perlio;
35990314 981#ifdef PERLIO_USING_CRLF
6ce75a77 982 tab = &PerlIO_crlf;
846be114 983#else
6ce75a77 984 if (PerlIO_stdio.Set_ptrcnt)
22569500 985 tab = &PerlIO_stdio;
846be114 986#endif
e17bc05a 987 DEBUG_i( PerlIO_debug("Pushing %s\n", tab->name) );
0987d6f3 988 PerlIO_list_push(aTHX_ av, (PerlIO_funcs *)tab, &PL_sv_undef);
dfebf958
NIS
989}
990
e3f3bf95 991SV *
14a5cf38 992PerlIO_arg_fetch(PerlIO_list_t *av, IV n)
e3f3bf95 993{
14a5cf38 994 return av->array[n].arg;
e3f3bf95
NIS
995}
996
f3862f8b 997PerlIO_funcs *
14a5cf38 998PerlIO_layer_fetch(pTHX_ PerlIO_list_t *av, IV n, PerlIO_funcs *def)
f3862f8b 999{
14a5cf38 1000 if (n >= 0 && n < av->cur) {
e17bc05a
TC
1001 DEBUG_i( PerlIO_debug("Layer %" IVdf " is %s\n", n,
1002 av->array[n].funcs->name) );
14a5cf38
JH
1003 return av->array[n].funcs;
1004 }
1005 if (!def)
1006 Perl_croak(aTHX_ "panic: PerlIO layer array corrupt");
1007 return def;
e3f3bf95
NIS
1008}
1009
4ec2216f
NIS
1010IV
1011PerlIOPop_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
1012{
8772537c
AL
1013 PERL_UNUSED_ARG(mode);
1014 PERL_UNUSED_ARG(arg);
1015 PERL_UNUSED_ARG(tab);
4ec2216f
NIS
1016 if (PerlIOValid(f)) {
1017 PerlIO_flush(f);
1018 PerlIO_pop(aTHX_ f);
1019 return 0;
1020 }
1021 return -1;
1022}
1023
27da23d5 1024PERLIO_FUNCS_DECL(PerlIO_remove) = {
4ec2216f
NIS
1025 sizeof(PerlIO_funcs),
1026 "pop",
1027 0,
1028 PERLIO_K_DUMMY | PERLIO_K_UTF8,
1029 PerlIOPop_pushed,
1030 NULL,
c0888ace 1031 PerlIOBase_open,
4ec2216f
NIS
1032 NULL,
1033 NULL,
1034 NULL,
1035 NULL,
1036 NULL,
1037 NULL,
1038 NULL,
1039 NULL,
de009b76
AL
1040 NULL,
1041 NULL,
4ec2216f
NIS
1042 NULL, /* flush */
1043 NULL, /* fill */
1044 NULL,
1045 NULL,
1046 NULL,
1047 NULL,
1048 NULL, /* get_base */
1049 NULL, /* get_bufsiz */
1050 NULL, /* get_ptr */
1051 NULL, /* get_cnt */
1052 NULL, /* set_ptrcnt */
1053};
1054
fcf2db38 1055PerlIO_list_t *
e3f3bf95
NIS
1056PerlIO_default_layers(pTHX)
1057{
3a1ee7e8 1058 if (!PL_def_layerlist) {
284167a5 1059 const char * const s = TAINTING_get ? NULL : PerlEnv_getenv("PERLIO");
27da23d5 1060 PERLIO_FUNCS_DECL(*osLayer) = &PerlIO_unix;
3a1ee7e8 1061 PL_def_layerlist = PerlIO_list_alloc(aTHX);
27da23d5 1062 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_unix));
979e2c82 1063#if defined(WIN32)
27da23d5 1064 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_win32));
2f8118af 1065#if 0
14a5cf38 1066 osLayer = &PerlIO_win32;
0c4128ad 1067#endif
2f8118af 1068#endif
27da23d5
JH
1069 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_raw));
1070 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_perlio));
1071 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_stdio));
1072 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_crlf));
27da23d5
JH
1073 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_utf8));
1074 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_remove));
1075 PerlIO_define_layer(aTHX_ PERLIO_FUNCS_CAST(&PerlIO_byte));
0987d6f3
TC
1076 PerlIO_list_push(aTHX_ PL_def_layerlist, (PerlIO_funcs *)osLayer,
1077 &PL_sv_undef);
14a5cf38 1078 if (s) {
3a1ee7e8 1079 PerlIO_parse_layers(aTHX_ PL_def_layerlist, s);
14a5cf38
JH
1080 }
1081 else {
3a1ee7e8 1082 PerlIO_default_buffer(aTHX_ PL_def_layerlist);
14a5cf38 1083 }
1141d9f8 1084 }
3a1ee7e8
NIS
1085 if (PL_def_layerlist->cur < 2) {
1086 PerlIO_default_buffer(aTHX_ PL_def_layerlist);
f3862f8b 1087 }
3a1ee7e8 1088 return PL_def_layerlist;
e3f3bf95
NIS
1089}
1090
0c4f7ff0
NIS
1091void
1092Perl_boot_core_PerlIO(pTHX)
1093{
1094#ifdef USE_ATTRIBUTES_FOR_PERLIO
14a5cf38
JH
1095 newXS("io::MODIFY_SCALAR_ATTRIBUTES", XS_io_MODIFY_SCALAR_ATTRIBUTES,
1096 __FILE__);
0c4f7ff0 1097#endif
14a5cf38 1098 newXS("PerlIO::Layer::find", XS_PerlIO__Layer__find, __FILE__);
c9bca74a 1099 newXS("PerlIO::Layer::NoWarnings", XS_PerlIO__Layer__NoWarnings, __FILE__);
0c4f7ff0 1100}
e3f3bf95
NIS
1101
1102PerlIO_funcs *
1103PerlIO_default_layer(pTHX_ I32 n)
1104{
46c461b5 1105 PerlIO_list_t * const av = PerlIO_default_layers(aTHX);
14a5cf38
JH
1106 if (n < 0)
1107 n += av->cur;
27da23d5 1108 return PerlIO_layer_fetch(aTHX_ av, n, PERLIO_FUNCS_CAST(&PerlIO_stdio));
f3862f8b
NIS
1109}
1110
a999f61b
NIS
1111#define PerlIO_default_top() PerlIO_default_layer(aTHX_ -1)
1112#define PerlIO_default_btm() PerlIO_default_layer(aTHX_ 0)
60382766
NIS
1113
1114void
1141d9f8 1115PerlIO_stdstreams(pTHX)
60382766 1116{
a1ea730d 1117 if (!PL_perlio) {
8995e67d 1118 PerlIO_init_table(aTHX);
14a5cf38
JH
1119 PerlIO_fdopen(0, "Ir" PERLIO_STDTEXT);
1120 PerlIO_fdopen(1, "Iw" PERLIO_STDTEXT);
1121 PerlIO_fdopen(2, "Iw" PERLIO_STDTEXT);
1122 }
60382766
NIS
1123}
1124
1125PerlIO *
27da23d5 1126PerlIO_push(pTHX_ PerlIO *f, PERLIO_FUNCS_DECL(*tab), const char *mode, SV *arg)
14a5cf38 1127{
16865ff7 1128 VERIFY_HEAD(f);
2dc2558e 1129 if (tab->fsize != sizeof(PerlIO_funcs)) {
0dc17498 1130 Perl_croak( aTHX_
147e3846 1131 "%s (%" UVuf ") does not match %s (%" UVuf ")",
5cf96513
RB
1132 "PerlIO layer function table size", (UV)tab->fsize,
1133 "size expected by this perl", (UV)sizeof(PerlIO_funcs) );
2dc2558e
NIS
1134 }
1135 if (tab->size) {
b464bac0 1136 PerlIOl *l;
2dc2558e 1137 if (tab->size < sizeof(PerlIOl)) {
0dc17498 1138 Perl_croak( aTHX_
147e3846 1139 "%s (%" UVuf ") smaller than %s (%" UVuf ")",
5cf96513
RB
1140 "PerlIO layer instance size", (UV)tab->size,
1141 "size expected by this perl", (UV)sizeof(PerlIOl) );
2dc2558e
NIS
1142 }
1143 /* Real layer with a data area */
002e75cf
JH
1144 if (f) {
1145 char *temp;
1146 Newxz(temp, tab->size, char);
1147 l = (PerlIOl*)temp;
1148 if (l) {
1149 l->next = *f;
1150 l->tab = (PerlIO_funcs*) tab;
16865ff7 1151 l->head = ((PerlIOl*)f)->head;
002e75cf 1152 *f = l;
e17bc05a
TC
1153 DEBUG_i( PerlIO_debug("PerlIO_push f=%p %s %s %p\n",
1154 (void*)f, tab->name,
1155 (mode) ? mode : "(Null)", (void*)arg) );
002e75cf
JH
1156 if (*l->tab->Pushed &&
1157 (*l->tab->Pushed)
1158 (aTHX_ f, mode, arg, (PerlIO_funcs*) tab) != 0) {
1159 PerlIO_pop(aTHX_ f);
1160 return NULL;
1161 }
2dc2558e 1162 }
002e75cf
JH
1163 else
1164 return NULL;
2dc2558e
NIS
1165 }
1166 }
1167 else if (f) {
1168 /* Pseudo-layer where push does its own stack adjust */
e17bc05a
TC
1169 DEBUG_i( PerlIO_debug("PerlIO_push f=%p %s %s %p\n", (void*)f, tab->name,
1170 (mode) ? mode : "(Null)", (void*)arg) );
210e727c 1171 if (tab->Pushed &&
27da23d5 1172 (*tab->Pushed) (aTHX_ f, mode, arg, (PerlIO_funcs*) tab) != 0) {
210e727c 1173 return NULL;
14a5cf38
JH
1174 }
1175 }
1176 return f;
60382766
NIS
1177}
1178
81fe74fb
LT
1179PerlIO *
1180PerlIOBase_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers,
1181 IV n, const char *mode, int fd, int imode, int perm,
1182 PerlIO *old, int narg, SV **args)
1183{
1184 PerlIO_funcs * const tab = PerlIO_layer_fetch(aTHX_ layers, n - 1, PerlIO_default_layer(aTHX_ 0));
1185 if (tab && tab->Open) {
1186 PerlIO* ret = (*tab->Open)(aTHX_ tab, layers, n - 1, mode, fd, imode, perm, old, narg, args);
6d5bdea2 1187 if (ret && PerlIO_push(aTHX_ ret, self, mode, PerlIOArg) == NULL) {
81fe74fb
LT
1188 PerlIO_close(ret);
1189 return NULL;
1190 }
1191 return ret;
1192 }
1193 SETERRNO(EINVAL, LIB_INVARG);
1194 return NULL;
1195}
1196
dfebf958 1197IV
86e05cf2
NIS
1198PerlIOBase_binmode(pTHX_ PerlIO *f)
1199{
1200 if (PerlIOValid(f)) {
1201 /* Is layer suitable for raw stream ? */
cc6623a8 1202 if (PerlIOBase(f)->tab && PerlIOBase(f)->tab->kind & PERLIO_K_RAW) {
86e05cf2
NIS
1203 /* Yes - turn off UTF-8-ness, to undo UTF-8 locale effects */
1204 PerlIOBase(f)->flags &= ~PERLIO_F_UTF8;
1205 }
1206 else {
1207 /* Not suitable - pop it */
1208 PerlIO_pop(aTHX_ f);
1209 }
1210 return 0;
1211 }
1212 return -1;
1213}
1214
1215IV
2dc2558e 1216PerlIORaw_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
dfebf958 1217{
8772537c
AL
1218 PERL_UNUSED_ARG(mode);
1219 PERL_UNUSED_ARG(arg);
1220 PERL_UNUSED_ARG(tab);
86e05cf2 1221
04892f78 1222 if (PerlIOValid(f)) {
86e05cf2 1223 PerlIO *t;
de009b76 1224 const PerlIOl *l;
14a5cf38 1225 PerlIO_flush(f);
86e05cf2
NIS
1226 /*
1227 * Strip all layers that are not suitable for a raw stream
1228 */
1229 t = f;
1230 while (t && (l = *t)) {
cc6623a8 1231 if (l->tab && l->tab->Binmode) {
86e05cf2 1232 /* Has a handler - normal case */
9d97e8b8 1233 if ((*l->tab->Binmode)(aTHX_ t) == 0) {
86e05cf2
NIS
1234 if (*t == l) {
1235 /* Layer still there - move down a layer */
1236 t = PerlIONext(t);
1237 }
1238 }
1239 else {
1240 return -1;
1241 }
14a5cf38
JH
1242 }
1243 else {
86e05cf2
NIS
1244 /* No handler - pop it */
1245 PerlIO_pop(aTHX_ t);
14a5cf38
JH
1246 }
1247 }
86e05cf2 1248 if (PerlIOValid(f)) {
e17bc05a
TC
1249 DEBUG_i( PerlIO_debug(":raw f=%p :%s\n", (void*)f,
1250 PerlIOBase(f)->tab ? PerlIOBase(f)->tab->name : "(Null)") );
86e05cf2
NIS
1251 return 0;
1252 }
14a5cf38
JH
1253 }
1254 return -1;
dfebf958
NIS
1255}
1256
ac27b0f5 1257int
14a5cf38 1258PerlIO_apply_layera(pTHX_ PerlIO *f, const char *mode,
d9dac8cd 1259 PerlIO_list_t *layers, IV n, IV max)
14a5cf38 1260{
14a5cf38
JH
1261 int code = 0;
1262 while (n < max) {
8772537c 1263 PerlIO_funcs * const tab = PerlIO_layer_fetch(aTHX_ layers, n, NULL);
14a5cf38
JH
1264 if (tab) {
1265 if (!PerlIO_push(aTHX_ f, tab, mode, PerlIOArg)) {
1266 code = -1;
1267 break;
1268 }
1269 }
1270 n++;
1271 }
1272 return code;
e3f3bf95
NIS
1273}
1274
1275int
ac27b0f5
NIS
1276PerlIO_apply_layers(pTHX_ PerlIO *f, const char *mode, const char *names)
1277{
14a5cf38 1278 int code = 0;
da0fccaa
DG
1279 ENTER;
1280 save_scalar(PL_errgv);
53f1b6d2 1281 if (f && names) {
8772537c 1282 PerlIO_list_t * const layers = PerlIO_list_alloc(aTHX);
14a5cf38
JH
1283 code = PerlIO_parse_layers(aTHX_ layers, names);
1284 if (code == 0) {
d9dac8cd 1285 code = PerlIO_apply_layera(aTHX_ f, mode, layers, 0, layers->cur);
14a5cf38 1286 }
3a1ee7e8 1287 PerlIO_list_free(aTHX_ layers);
ac27b0f5 1288 }
da0fccaa 1289 LEAVE;
14a5cf38 1290 return code;
ac27b0f5
NIS
1291}
1292
f3862f8b 1293
60382766 1294/*--------------------------------------------------------------------------------------*/
14a5cf38 1295/*
71200d45 1296 * Given the abstraction above the public API functions
14a5cf38 1297 */
60382766
NIS
1298
1299int
f5b9d040 1300PerlIO_binmode(pTHX_ PerlIO *f, int iotype, int mode, const char *names)
76ced9ad 1301{
5347602a
DM
1302 PERL_UNUSED_ARG(iotype);
1303 PERL_UNUSED_ARG(mode);
1304
e17bc05a
TC
1305 DEBUG_i(
1306 PerlIO_debug("PerlIO_binmode f=%p %s %c %x %s\n", (void*)f,
1307 (PerlIOBase(f) && PerlIOBase(f)->tab) ?
1308 PerlIOBase(f)->tab->name : "(Null)",
1309 iotype, mode, (names) ? names : "(Null)") );
68b5363f 1310
03c0554d
NIS
1311 if (names) {
1312 /* Do not flush etc. if (e.g.) switching encodings.
1313 if a pushed layer knows it needs to flush lower layers
1314 (for example :unix which is never going to call them)
1315 it can do the flush when it is pushed.
1316 */
8298454c 1317 return cBOOL(PerlIO_apply_layers(aTHX_ f, NULL, names) == 0);
03c0554d
NIS
1318 }
1319 else {
86e05cf2 1320 /* Fake 5.6 legacy of using this call to turn ON O_TEXT */
35990314 1321#ifdef PERLIO_USING_CRLF
03c0554d
NIS
1322 /* Legacy binmode only has meaning if O_TEXT has a value distinct from
1323 O_BINARY so we can look for it in mode.
1324 */
1325 if (!(mode & O_BINARY)) {
1326 /* Text mode */
86e05cf2
NIS
1327 /* FIXME?: Looking down the layer stack seems wrong,
1328 but is a way of reaching past (say) an encoding layer
1329 to flip CRLF-ness of the layer(s) below
1330 */
03c0554d
NIS
1331 while (*f) {
1332 /* Perhaps we should turn on bottom-most aware layer
1333 e.g. Ilya's idea that UNIX TTY could serve
1334 */
cc6623a8
DM
1335 if (PerlIOBase(f)->tab &&
1336 PerlIOBase(f)->tab->kind & PERLIO_K_CANCRLF)
1337 {
03c0554d
NIS
1338 if (!(PerlIOBase(f)->flags & PERLIO_F_CRLF)) {
1339 /* Not in text mode - flush any pending stuff and flip it */
1340 PerlIO_flush(f);
1341 PerlIOBase(f)->flags |= PERLIO_F_CRLF;
1342 }
1343 /* Only need to turn it on in one layer so we are done */
1344 return TRUE;
ed53a2bb 1345 }
03c0554d 1346 f = PerlIONext(f);
14a5cf38 1347 }
03c0554d
NIS
1348 /* Not finding a CRLF aware layer presumably means we are binary
1349 which is not what was requested - so we failed
1350 We _could_ push :crlf layer but so could caller
1351 */
1352 return FALSE;
14a5cf38 1353 }
6ce75a77 1354#endif
86e05cf2
NIS
1355 /* Legacy binmode is now _defined_ as being equivalent to pushing :raw
1356 So code that used to be here is now in PerlIORaw_pushed().
03c0554d 1357 */
8298454c 1358 return cBOOL(PerlIO_push(aTHX_ f, PERLIO_FUNCS_CAST(&PerlIO_raw), NULL, NULL));
14a5cf38 1359 }
f5b9d040
NIS
1360}
1361
f5b9d040 1362int
e87a358a 1363PerlIO__close(pTHX_ PerlIO *f)
f5b9d040 1364{
37725cdc 1365 if (PerlIOValid(f)) {
46c461b5 1366 PerlIO_funcs * const tab = PerlIOBase(f)->tab;
37725cdc
NIS
1367 if (tab && tab->Close)
1368 return (*tab->Close)(aTHX_ f);
1369 else
1370 return PerlIOBase_close(aTHX_ f);
1371 }
14a5cf38 1372 else {
93189314 1373 SETERRNO(EBADF, SS_IVCHAN);
14a5cf38
JH
1374 return -1;
1375 }
76ced9ad
NIS
1376}
1377
b931b1d9 1378int
e87a358a 1379Perl_PerlIO_close(pTHX_ PerlIO *f)
b931b1d9 1380{
de009b76 1381 const int code = PerlIO__close(aTHX_ f);
37725cdc
NIS
1382 while (PerlIOValid(f)) {
1383 PerlIO_pop(aTHX_ f);
abf9167d
DM
1384 if (PerlIO_lockcnt(f))
1385 /* we're in use; the 'pop' deferred freeing the structure */
1386 f = PerlIONext(f);
f6c77cf1 1387 }
14a5cf38 1388 return code;
b931b1d9
NIS
1389}
1390
b931b1d9 1391int
e87a358a 1392Perl_PerlIO_fileno(pTHX_ PerlIO *f)
b931b1d9 1393{
20b7effb 1394 Perl_PerlIO_or_Base(f, Fileno, fileno, -1, (aTHX_ f));
b931b1d9
NIS
1395}
1396
1141d9f8 1397
fcf2db38 1398static PerlIO_funcs *
2edd7e44
NIS
1399PerlIO_layer_from_ref(pTHX_ SV *sv)
1400{
14a5cf38 1401 /*
71200d45 1402 * For any scalar type load the handler which is bundled with perl
14a5cf38 1403 */
526fd1b4 1404 if (SvTYPE(sv) < SVt_PVAV && (!isGV_with_GP(sv) || SvFAKE(sv))) {
75208dda
RGS
1405 PerlIO_funcs *f = PerlIO_find_layer(aTHX_ STR_WITH_LEN("scalar"), 1);
1406 /* This isn't supposed to happen, since PerlIO::scalar is core,
1407 * but could happen anyway in smaller installs or with PAR */
a2a5de95 1408 if (!f)
dcbac5bb 1409 /* diag_listed_as: Unknown PerlIO layer "%s" */
a2a5de95 1410 Perl_ck_warner(aTHX_ packWARN(WARN_LAYER), "Unknown PerlIO layer \"scalar\"");
75208dda
RGS
1411 return f;
1412 }
14a5cf38
JH
1413
1414 /*
71200d45 1415 * For other types allow if layer is known but don't try and load it
14a5cf38
JH
1416 */
1417 switch (SvTYPE(sv)) {
1418 case SVt_PVAV:
6a245ed1 1419 return PerlIO_find_layer(aTHX_ STR_WITH_LEN("Array"), 0);
14a5cf38 1420 case SVt_PVHV:
6a245ed1 1421 return PerlIO_find_layer(aTHX_ STR_WITH_LEN("Hash"), 0);
14a5cf38 1422 case SVt_PVCV:
6a245ed1 1423 return PerlIO_find_layer(aTHX_ STR_WITH_LEN("Code"), 0);
14a5cf38 1424 case SVt_PVGV:
6a245ed1 1425 return PerlIO_find_layer(aTHX_ STR_WITH_LEN("Glob"), 0);
42d0e0b7
AL
1426 default:
1427 return NULL;
14a5cf38 1428 }
2edd7e44
NIS
1429}
1430
fcf2db38 1431PerlIO_list_t *
14a5cf38
JH
1432PerlIO_resolve_layers(pTHX_ const char *layers,
1433 const char *mode, int narg, SV **args)
1434{
1435 PerlIO_list_t *def = PerlIO_default_layers(aTHX);
1436 int incdef = 1;
a1ea730d 1437 if (!PL_perlio)
14a5cf38
JH
1438 PerlIO_stdstreams(aTHX);
1439 if (narg) {
dcda55fc 1440 SV * const arg = *args;
14a5cf38 1441 /*
71200d45
NIS
1442 * If it is a reference but not an object see if we have a handler
1443 * for it
14a5cf38 1444 */
4e0ef342 1445 if (SvROK(arg) && !SvOBJECT(SvRV(arg))) {
46c461b5 1446 PerlIO_funcs * const handler = PerlIO_layer_from_ref(aTHX_ SvRV(arg));
14a5cf38 1447 if (handler) {
3a1ee7e8
NIS
1448 def = PerlIO_list_alloc(aTHX);
1449 PerlIO_list_push(aTHX_ def, handler, &PL_sv_undef);
14a5cf38
JH
1450 incdef = 0;
1451 }
1452 /*
e934609f 1453 * Don't fail if handler cannot be found :via(...) etc. may do
14a5cf38 1454 * something sensible else we will just stringfy and open
71200d45 1455 * resulting string.
14a5cf38
JH
1456 */
1457 }
1458 }
9fe371da 1459 if (!layers || !*layers)
11bcd5da 1460 layers = Perl_PerlIO_context_layers(aTHX_ mode);
14a5cf38
JH
1461 if (layers && *layers) {
1462 PerlIO_list_t *av;
1463 if (incdef) {
a951d81d 1464 av = PerlIO_clone_list(aTHX_ def, NULL);
14a5cf38
JH
1465 }
1466 else {
1467 av = def;
1468 }
0cff2cf3
NIS
1469 if (PerlIO_parse_layers(aTHX_ av, layers) == 0) {
1470 return av;
1471 }
1472 else {
1473 PerlIO_list_free(aTHX_ av);
b37c2d43 1474 return NULL;
0cff2cf3 1475 }
14a5cf38
JH
1476 }
1477 else {
1478 if (incdef)
1479 def->refcnt++;
1480 return def;
1481 }
ee518936
NIS
1482}
1483
1484PerlIO *
14a5cf38
JH
1485PerlIO_openn(pTHX_ const char *layers, const char *mode, int fd,
1486 int imode, int perm, PerlIO *f, int narg, SV **args)
1487{
1488 if (!f && narg == 1 && *args == &PL_sv_undef) {
1489 if ((f = PerlIO_tmpfile())) {
9fe371da 1490 if (!layers || !*layers)
11bcd5da 1491 layers = Perl_PerlIO_context_layers(aTHX_ mode);
14a5cf38
JH
1492 if (layers && *layers)
1493 PerlIO_apply_layers(aTHX_ f, mode, layers);
1494 }
1495 }
1496 else {
de009b76 1497 PerlIO_list_t *layera;
14a5cf38
JH
1498 IV n;
1499 PerlIO_funcs *tab = NULL;
04892f78 1500 if (PerlIOValid(f)) {
14a5cf38 1501 /*
71200d45
NIS
1502 * This is "reopen" - it is not tested as perl does not use it
1503 * yet
14a5cf38
JH
1504 */
1505 PerlIOl *l = *f;
3a1ee7e8 1506 layera = PerlIO_list_alloc(aTHX);
14a5cf38 1507 while (l) {
a951d81d 1508 SV *arg = NULL;
cc6623a8 1509 if (l->tab && l->tab->Getarg)
a951d81d
BL
1510 arg = (*l->tab->Getarg) (aTHX_ &l, NULL, 0);
1511 PerlIO_list_push(aTHX_ layera, l->tab,
1512 (arg) ? arg : &PL_sv_undef);
ef8d46e8 1513 SvREFCNT_dec(arg);
14a5cf38
JH
1514 l = *PerlIONext(&l);
1515 }
1516 }
1517 else {
1518 layera = PerlIO_resolve_layers(aTHX_ layers, mode, narg, args);
0cff2cf3
NIS
1519 if (!layera) {
1520 return NULL;
1521 }
14a5cf38
JH
1522 }
1523 /*
71200d45 1524 * Start at "top" of layer stack
14a5cf38
JH
1525 */
1526 n = layera->cur - 1;
1527 while (n >= 0) {
46c461b5 1528 PerlIO_funcs * const t = PerlIO_layer_fetch(aTHX_ layera, n, NULL);
14a5cf38
JH
1529 if (t && t->Open) {
1530 tab = t;
1531 break;
1532 }
1533 n--;
1534 }
1535 if (tab) {
1536 /*
71200d45 1537 * Found that layer 'n' can do opens - call it
14a5cf38 1538 */
7cf31beb 1539 if (narg > 1 && !(tab->kind & PERLIO_K_MULTIARG)) {
3b8752bb 1540 Perl_croak(aTHX_ "More than one argument to open(,':%s')",tab->name);
7cf31beb 1541 }
e17bc05a
TC
1542 DEBUG_i( PerlIO_debug("openn(%s,'%s','%s',%d,%x,%o,%p,%d,%p)\n",
1543 tab->name, layers ? layers : "(Null)", mode, fd,
1544 imode, perm, (void*)f, narg, (void*)args) );
210e727c
JH
1545 if (tab->Open)
1546 f = (*tab->Open) (aTHX_ tab, layera, n, mode, fd, imode, perm,
1547 f, narg, args);
1548 else {
1549 SETERRNO(EINVAL, LIB_INVARG);
1550 f = NULL;
1551 }
14a5cf38
JH
1552 if (f) {
1553 if (n + 1 < layera->cur) {
1554 /*
1555 * More layers above the one that we used to open -
71200d45 1556 * apply them now
14a5cf38 1557 */
d9dac8cd
NIS
1558 if (PerlIO_apply_layera(aTHX_ f, mode, layera, n + 1, layera->cur) != 0) {
1559 /* If pushing layers fails close the file */
1560 PerlIO_close(f);
14a5cf38
JH
1561 f = NULL;
1562 }
1563 }
1564 }
1565 }
3a1ee7e8 1566 PerlIO_list_free(aTHX_ layera);
14a5cf38
JH
1567 }
1568 return f;
ee518936 1569}
b931b1d9
NIS
1570
1571
9e353e3b 1572SSize_t
e87a358a 1573Perl_PerlIO_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
6f9d8c32 1574{
7918f24d
NC
1575 PERL_ARGS_ASSERT_PERLIO_READ;
1576
b32dd47e 1577 Perl_PerlIO_or_Base(f, Read, read, -1, (aTHX_ f, vbuf, count));
760ac839
LW
1578}
1579
313ca112 1580SSize_t
e87a358a 1581Perl_PerlIO_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
760ac839 1582{
7918f24d
NC
1583 PERL_ARGS_ASSERT_PERLIO_UNREAD;
1584
b32dd47e 1585 Perl_PerlIO_or_Base(f, Unread, unread, -1, (aTHX_ f, vbuf, count));
760ac839
LW
1586}
1587
9e353e3b 1588SSize_t
e87a358a 1589Perl_PerlIO_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
760ac839 1590{
7918f24d
NC
1591 PERL_ARGS_ASSERT_PERLIO_WRITE;
1592
b32dd47e 1593 Perl_PerlIO_or_fail(f, Write, -1, (aTHX_ f, vbuf, count));
760ac839
LW
1594}
1595
6f9d8c32 1596int
e87a358a 1597Perl_PerlIO_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
760ac839 1598{
b32dd47e 1599 Perl_PerlIO_or_fail(f, Seek, -1, (aTHX_ f, offset, whence));
760ac839
LW
1600}
1601
9e353e3b 1602Off_t
e87a358a 1603Perl_PerlIO_tell(pTHX_ PerlIO *f)
760ac839 1604{
b32dd47e 1605 Perl_PerlIO_or_fail(f, Tell, -1, (aTHX_ f));
760ac839
LW
1606}
1607
6f9d8c32 1608int
e87a358a 1609Perl_PerlIO_flush(pTHX_ PerlIO *f)
760ac839 1610{
14a5cf38
JH
1611 if (f) {
1612 if (*f) {
de009b76 1613 const PerlIO_funcs *tab = PerlIOBase(f)->tab;
1b7a0411
JH
1614
1615 if (tab && tab->Flush)
f62ce20a 1616 return (*tab->Flush) (aTHX_ f);
1b7a0411
JH
1617 else
1618 return 0; /* If no Flush defined, silently succeed. */
14a5cf38
JH
1619 }
1620 else {
e17bc05a 1621 DEBUG_i( PerlIO_debug("Cannot flush f=%p\n", (void*)f) );
93189314 1622 SETERRNO(EBADF, SS_IVCHAN);
14a5cf38
JH
1623 return -1;
1624 }
1625 }
1626 else {
1627 /*
1628 * Is it good API design to do flush-all on NULL, a potentially
486ec47a 1629 * erroneous input? Maybe some magical value (PerlIO*
14a5cf38
JH
1630 * PERLIO_FLUSH_ALL = (PerlIO*)-1;)? Yes, stdio does similar
1631 * things on fflush(NULL), but should we be bound by their design
71200d45 1632 * decisions? --jhi
14a5cf38 1633 */
303f2dc3
DM
1634 PerlIOl **table = &PL_perlio;
1635 PerlIOl *ff;
14a5cf38 1636 int code = 0;
303f2dc3 1637 while ((ff = *table)) {
14a5cf38 1638 int i;
303f2dc3 1639 table = (PerlIOl **) (ff++);
14a5cf38 1640 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
303f2dc3 1641 if (ff->next && PerlIO_flush(&(ff->next)) != 0)
14a5cf38 1642 code = -1;
303f2dc3 1643 ff++;
14a5cf38
JH
1644 }
1645 }
1646 return code;
1647 }
760ac839
LW
1648}
1649
a9c883f6 1650void
f62ce20a 1651PerlIOBase_flush_linebuf(pTHX)
a9c883f6 1652{
303f2dc3
DM
1653 PerlIOl **table = &PL_perlio;
1654 PerlIOl *f;
14a5cf38
JH
1655 while ((f = *table)) {
1656 int i;
303f2dc3 1657 table = (PerlIOl **) (f++);
14a5cf38 1658 for (i = 1; i < PERLIO_TABLE_SIZE; i++) {
303f2dc3
DM
1659 if (f->next
1660 && (PerlIOBase(&(f->next))->
14a5cf38
JH
1661 flags & (PERLIO_F_LINEBUF | PERLIO_F_CANWRITE))
1662 == (PERLIO_F_LINEBUF | PERLIO_F_CANWRITE))
303f2dc3 1663 PerlIO_flush(&(f->next));
14a5cf38
JH
1664 f++;
1665 }
a9c883f6 1666 }
a9c883f6
NIS
1667}
1668
06da4f11 1669int
e87a358a 1670Perl_PerlIO_fill(pTHX_ PerlIO *f)
06da4f11 1671{
b32dd47e 1672 Perl_PerlIO_or_fail(f, Fill, -1, (aTHX_ f));
06da4f11
NIS
1673}
1674
f3862f8b
NIS
1675int
1676PerlIO_isutf8(PerlIO *f)
1677{
1b7a0411
JH
1678 if (PerlIOValid(f))
1679 return (PerlIOBase(f)->flags & PERLIO_F_UTF8) != 0;
1680 else
1681 SETERRNO(EBADF, SS_IVCHAN);
37725cdc 1682
1b7a0411 1683 return -1;
f3862f8b
NIS
1684}
1685
6f9d8c32 1686int
e87a358a 1687Perl_PerlIO_eof(pTHX_ PerlIO *f)
760ac839 1688{
b32dd47e 1689 Perl_PerlIO_or_Base(f, Eof, eof, -1, (aTHX_ f));
9e353e3b
NIS
1690}
1691
9e353e3b 1692int
e87a358a 1693Perl_PerlIO_error(pTHX_ PerlIO *f)
9e353e3b 1694{
b32dd47e 1695 Perl_PerlIO_or_Base(f, Error, error, -1, (aTHX_ f));
9e353e3b
NIS
1696}
1697
9e353e3b 1698void
e87a358a 1699Perl_PerlIO_clearerr(pTHX_ PerlIO *f)
9e353e3b 1700{
b32dd47e 1701 Perl_PerlIO_or_Base_void(f, Clearerr, clearerr, (aTHX_ f));
9e353e3b
NIS
1702}
1703
9e353e3b 1704void
e87a358a 1705Perl_PerlIO_setlinebuf(pTHX_ PerlIO *f)
9e353e3b 1706{
b32dd47e 1707 Perl_PerlIO_or_Base_void(f, Setlinebuf, setlinebuf, (aTHX_ f));
9e353e3b
NIS
1708}
1709
9e353e3b
NIS
1710int
1711PerlIO_has_base(PerlIO *f)
1712{
1b7a0411 1713 if (PerlIOValid(f)) {
46c461b5 1714 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
1b7a0411
JH
1715
1716 if (tab)
1717 return (tab->Get_base != NULL);
1b7a0411 1718 }
1b7a0411
JH
1719
1720 return 0;
760ac839
LW
1721}
1722
9e353e3b
NIS
1723int
1724PerlIO_fast_gets(PerlIO *f)
760ac839 1725{
d7dfc388
SK
1726 if (PerlIOValid(f)) {
1727 if (PerlIOBase(f)->flags & PERLIO_F_FASTGETS) {
1728 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
1b7a0411 1729
d7dfc388
SK
1730 if (tab)
1731 return (tab->Set_ptrcnt != NULL);
d7dfc388 1732 }
14a5cf38 1733 }
1b7a0411 1734
14a5cf38 1735 return 0;
9e353e3b
NIS
1736}
1737
9e353e3b
NIS
1738int
1739PerlIO_has_cntptr(PerlIO *f)
1740{
04892f78 1741 if (PerlIOValid(f)) {
46c461b5 1742 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
1b7a0411
JH
1743
1744 if (tab)
1745 return (tab->Get_ptr != NULL && tab->Get_cnt != NULL);
14a5cf38 1746 }
1b7a0411 1747
14a5cf38 1748 return 0;
9e353e3b
NIS
1749}
1750
9e353e3b
NIS
1751int
1752PerlIO_canset_cnt(PerlIO *f)
1753{
04892f78 1754 if (PerlIOValid(f)) {
46c461b5 1755 const PerlIO_funcs * const tab = PerlIOBase(f)->tab;
1b7a0411
JH
1756
1757 if (tab)
1758 return (tab->Set_ptrcnt != NULL);
14a5cf38 1759 }
1b7a0411 1760
14a5cf38 1761 return 0;
760ac839
LW
1762}
1763
888911fc 1764STDCHAR *
e87a358a 1765Perl_PerlIO_get_base(pTHX_ PerlIO *f)
760ac839 1766{
b32dd47e 1767 Perl_PerlIO_or_fail(f, Get_base, NULL, (aTHX_ f));
9e353e3b
NIS
1768}
1769
b66f3475 1770SSize_t
e87a358a 1771Perl_PerlIO_get_bufsiz(pTHX_ PerlIO *f)
9e353e3b 1772{
b66f3475 1773 /* Note that Get_bufsiz returns a Size_t */
b32dd47e 1774 Perl_PerlIO_or_fail(f, Get_bufsiz, -1, (aTHX_ f));
9e353e3b
NIS
1775}
1776
9e353e3b 1777STDCHAR *
e87a358a 1778Perl_PerlIO_get_ptr(pTHX_ PerlIO *f)
9e353e3b 1779{
b32dd47e 1780 Perl_PerlIO_or_fail(f, Get_ptr, NULL, (aTHX_ f));
9e353e3b
NIS
1781}
1782
b66f3475 1783SSize_t
e87a358a 1784Perl_PerlIO_get_cnt(pTHX_ PerlIO *f)
9e353e3b 1785{
b32dd47e 1786 Perl_PerlIO_or_fail(f, Get_cnt, -1, (aTHX_ f));
9e353e3b
NIS
1787}
1788
9e353e3b 1789void
b66f3475 1790Perl_PerlIO_set_cnt(pTHX_ PerlIO *f, SSize_t cnt)
9e353e3b 1791{
b32dd47e 1792 Perl_PerlIO_or_fail_void(f, Set_ptrcnt, (aTHX_ f, NULL, cnt));
9e353e3b
NIS
1793}
1794
9e353e3b 1795void
b66f3475 1796Perl_PerlIO_set_ptrcnt(pTHX_ PerlIO *f, STDCHAR * ptr, SSize_t cnt)
9e353e3b 1797{
b32dd47e 1798 Perl_PerlIO_or_fail_void(f, Set_ptrcnt, (aTHX_ f, ptr, cnt));
9e353e3b
NIS
1799}
1800
4ec2216f 1801
9e353e3b 1802/*--------------------------------------------------------------------------------------*/
14a5cf38 1803/*
71200d45 1804 * utf8 and raw dummy layers
14a5cf38 1805 */
dfebf958 1806
26fb694e 1807IV
2dc2558e 1808PerlIOUtf8_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
26fb694e 1809{
96a5add6 1810 PERL_UNUSED_CONTEXT;
8772537c
AL
1811 PERL_UNUSED_ARG(mode);
1812 PERL_UNUSED_ARG(arg);
00f51856 1813 if (PerlIOValid(f)) {
cc6623a8 1814 if (tab && tab->kind & PERLIO_K_UTF8)
14a5cf38
JH
1815 PerlIOBase(f)->flags |= PERLIO_F_UTF8;
1816 else
1817 PerlIOBase(f)->flags &= ~PERLIO_F_UTF8;
1818 return 0;
1819 }
1820 return -1;
26fb694e
NIS
1821}
1822
27da23d5 1823PERLIO_FUNCS_DECL(PerlIO_utf8) = {
2dc2558e 1824 sizeof(PerlIO_funcs),
14a5cf38 1825 "utf8",
2dc2558e 1826 0,
a778d1f5 1827 PERLIO_K_DUMMY | PERLIO_K_UTF8 | PERLIO_K_MULTIARG,
14a5cf38
JH
1828 PerlIOUtf8_pushed,
1829 NULL,
c0888ace 1830 PerlIOBase_open,
14a5cf38
JH
1831 NULL,
1832 NULL,
1833 NULL,
1834 NULL,
1835 NULL,
1836 NULL,
1837 NULL,
1838 NULL,
de009b76
AL
1839 NULL,
1840 NULL,
22569500
NIS
1841 NULL, /* flush */
1842 NULL, /* fill */
14a5cf38
JH
1843 NULL,
1844 NULL,
1845 NULL,
1846 NULL,
22569500
NIS
1847 NULL, /* get_base */
1848 NULL, /* get_bufsiz */
1849 NULL, /* get_ptr */
1850 NULL, /* get_cnt */
1851 NULL, /* set_ptrcnt */
26fb694e
NIS
1852};
1853
27da23d5 1854PERLIO_FUNCS_DECL(PerlIO_byte) = {
2dc2558e 1855 sizeof(PerlIO_funcs),
14a5cf38 1856 "bytes",
2dc2558e 1857 0,
a778d1f5 1858 PERLIO_K_DUMMY | PERLIO_K_MULTIARG,
14a5cf38
JH
1859 PerlIOUtf8_pushed,
1860 NULL,
c0888ace 1861 PerlIOBase_open,
14a5cf38
JH
1862 NULL,
1863 NULL,
1864 NULL,
1865 NULL,
1866 NULL,
1867 NULL,
1868 NULL,
1869 NULL,
de009b76
AL
1870 NULL,
1871 NULL,
22569500
NIS
1872 NULL, /* flush */
1873 NULL, /* fill */
14a5cf38
JH
1874 NULL,
1875 NULL,
1876 NULL,
1877 NULL,
22569500
NIS
1878 NULL, /* get_base */
1879 NULL, /* get_bufsiz */
1880 NULL, /* get_ptr */
1881 NULL, /* get_cnt */
1882 NULL, /* set_ptrcnt */
dfebf958
NIS
1883};
1884
27da23d5 1885PERLIO_FUNCS_DECL(PerlIO_raw) = {
2dc2558e 1886 sizeof(PerlIO_funcs),
14a5cf38 1887 "raw",
2dc2558e 1888 0,
14a5cf38
JH
1889 PERLIO_K_DUMMY,
1890 PerlIORaw_pushed,
1891 PerlIOBase_popped,
ecfd0649 1892 PerlIOBase_open,
14a5cf38
JH
1893 NULL,
1894 NULL,
1895 NULL,
1896 NULL,
1897 NULL,
1898 NULL,
1899 NULL,
1900 NULL,
de009b76
AL
1901 NULL,
1902 NULL,
22569500
NIS
1903 NULL, /* flush */
1904 NULL, /* fill */
14a5cf38
JH
1905 NULL,
1906 NULL,
1907 NULL,
1908 NULL,
22569500
NIS
1909 NULL, /* get_base */
1910 NULL, /* get_bufsiz */
1911 NULL, /* get_ptr */
1912 NULL, /* get_cnt */
1913 NULL, /* set_ptrcnt */
dfebf958
NIS
1914};
1915/*--------------------------------------------------------------------------------------*/
1916/*--------------------------------------------------------------------------------------*/
14a5cf38 1917/*
71200d45 1918 * "Methods" of the "base class"
14a5cf38 1919 */
9e353e3b
NIS
1920
1921IV
f62ce20a 1922PerlIOBase_fileno(pTHX_ PerlIO *f)
9e353e3b 1923{
04892f78 1924 return PerlIOValid(f) ? PerlIO_fileno(PerlIONext(f)) : -1;
9e353e3b
NIS
1925}
1926
f5b9d040 1927char *
81428673 1928PerlIO_modestr(PerlIO * f, char *buf)
14a5cf38
JH
1929{
1930 char *s = buf;
81428673 1931 if (PerlIOValid(f)) {
de009b76 1932 const IV flags = PerlIOBase(f)->flags;
81428673
NIS
1933 if (flags & PERLIO_F_APPEND) {
1934 *s++ = 'a';
1935 if (flags & PERLIO_F_CANREAD) {
1936 *s++ = '+';
1937 }
14a5cf38 1938 }
81428673
NIS
1939 else if (flags & PERLIO_F_CANREAD) {
1940 *s++ = 'r';
1941 if (flags & PERLIO_F_CANWRITE)
1942 *s++ = '+';
1943 }
1944 else if (flags & PERLIO_F_CANWRITE) {
1945 *s++ = 'w';
1946 if (flags & PERLIO_F_CANREAD) {
1947 *s++ = '+';
1948 }
14a5cf38 1949 }
35990314 1950#ifdef PERLIO_USING_CRLF
81428673
NIS
1951 if (!(flags & PERLIO_F_CRLF))
1952 *s++ = 'b';
5f1a76d0 1953#endif
81428673 1954 }
14a5cf38
JH
1955 *s = '\0';
1956 return buf;
f5b9d040
NIS
1957}
1958
81428673 1959
76ced9ad 1960IV
2dc2558e 1961PerlIOBase_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
9e353e3b 1962{
de009b76 1963 PerlIOl * const l = PerlIOBase(f);
96a5add6 1964 PERL_UNUSED_CONTEXT;
8772537c 1965 PERL_UNUSED_ARG(arg);
de009b76 1966
14a5cf38
JH
1967 l->flags &= ~(PERLIO_F_CANREAD | PERLIO_F_CANWRITE |
1968 PERLIO_F_TRUNCATE | PERLIO_F_APPEND);
cc6623a8 1969 if (tab && tab->Set_ptrcnt != NULL)
14a5cf38
JH
1970 l->flags |= PERLIO_F_FASTGETS;
1971 if (mode) {
3b6c1aba 1972 if (*mode == IoTYPE_NUMERIC || *mode == IoTYPE_IMPLICIT)
14a5cf38
JH
1973 mode++;
1974 switch (*mode++) {
1975 case 'r':
1976 l->flags |= PERLIO_F_CANREAD;
1977 break;
1978 case 'a':
1979 l->flags |= PERLIO_F_APPEND | PERLIO_F_CANWRITE;
1980 break;
1981 case 'w':
1982 l->flags |= PERLIO_F_TRUNCATE | PERLIO_F_CANWRITE;
1983 break;
1984 default:
93189314 1985 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH
1986 return -1;
1987 }
49fc4906
YK
1988#ifdef EBCDIC
1989 {
1990 /* The mode variable contains one positional parameter followed by
1991 * optional keyword parameters. The positional parameters must be
1992 * passed as lowercase characters. The keyword parameters can be
1993 * passed in mixed case. They must be separated by commas. Only one
1994 * instance of a keyword can be specified. */
1995 int comma = 0;
1996 while (*mode) {
1997 switch (*mode++) {
1998 case '+':
1999 if(!comma)
2000 l->flags |= PERLIO_F_CANREAD | PERLIO_F_CANWRITE;
2001 break;
2002 case 'b':
2003 if(!comma)
2004 l->flags &= ~PERLIO_F_CRLF;
2005 break;
2006 case 't':
2007 if(!comma)
2008 l->flags |= PERLIO_F_CRLF;
2009 break;
2010 case ',':
2011 comma = 1;
2012 break;
2013 default:
2014 break;
2015 }
2016 }
2017 }
2018#else
14a5cf38
JH
2019 while (*mode) {
2020 switch (*mode++) {
2021 case '+':
2022 l->flags |= PERLIO_F_CANREAD | PERLIO_F_CANWRITE;
2023 break;
2024 case 'b':
2025 l->flags &= ~PERLIO_F_CRLF;
2026 break;
2027 case 't':
2028 l->flags |= PERLIO_F_CRLF;
2029 break;
2030 default:
93189314 2031 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH
2032 return -1;
2033 }
2034 }
49fc4906 2035#endif
14a5cf38
JH
2036 }
2037 else {
2038 if (l->next) {
2039 l->flags |= l->next->flags &
2040 (PERLIO_F_CANREAD | PERLIO_F_CANWRITE | PERLIO_F_TRUNCATE |
2041 PERLIO_F_APPEND);
2042 }
2043 }
5e2ab84b 2044#if 0
e17bc05a 2045 DEBUG_i(
14a5cf38 2046 PerlIO_debug("PerlIOBase_pushed f=%p %s %s fl=%08" UVxf " (%s)\n",
6c9570dc 2047 (void*)f, PerlIOBase(f)->tab->name, (omode) ? omode : "(Null)",
14a5cf38 2048 l->flags, PerlIO_modestr(f, temp));
e17bc05a 2049 );
5e2ab84b 2050#endif
14a5cf38 2051 return 0;
76ced9ad
NIS
2052}
2053
2054IV
f62ce20a 2055PerlIOBase_popped(pTHX_ PerlIO *f)
76ced9ad 2056{
96a5add6 2057 PERL_UNUSED_CONTEXT;
8772537c 2058 PERL_UNUSED_ARG(f);
14a5cf38 2059 return 0;
760ac839
LW
2060}
2061
9e353e3b 2062SSize_t
f62ce20a 2063PerlIOBase_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 2064{
14a5cf38 2065 /*
71200d45 2066 * Save the position as current head considers it
14a5cf38 2067 */
de009b76 2068 const Off_t old = PerlIO_tell(f);
a0714e2c 2069 PerlIO_push(aTHX_ f, PERLIO_FUNCS_CAST(&PerlIO_pending), "r", NULL);
14a5cf38 2070 PerlIOSelf(f, PerlIOBuf)->posn = old;
de009b76 2071 return PerlIOBuf_unread(aTHX_ f, vbuf, count);
9e353e3b
NIS
2072}
2073
f6c77cf1 2074SSize_t
f62ce20a 2075PerlIOBase_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
f6c77cf1 2076{
14a5cf38
JH
2077 STDCHAR *buf = (STDCHAR *) vbuf;
2078 if (f) {
263df5f1
JH
2079 if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD)) {
2080 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
2081 SETERRNO(EBADF, SS_IVCHAN);
0ea86a10 2082 PerlIO_save_errno(f);
263df5f1
JH
2083 return 0;
2084 }
14a5cf38 2085 while (count > 0) {
93c2c2ec
IZ
2086 get_cnt:
2087 {
14a5cf38
JH
2088 SSize_t avail = PerlIO_get_cnt(f);
2089 SSize_t take = 0;
2090 if (avail > 0)
94e529cc 2091 take = (((SSize_t) count >= 0) && ((SSize_t)count < avail)) ? (SSize_t)count : avail;
14a5cf38
JH
2092 if (take > 0) {
2093 STDCHAR *ptr = PerlIO_get_ptr(f);
2094 Copy(ptr, buf, take, STDCHAR);
2095 PerlIO_set_ptrcnt(f, ptr + take, (avail -= take));
2096 count -= take;
2097 buf += take;
93c2c2ec
IZ
2098 if (avail == 0) /* set_ptrcnt could have reset avail */
2099 goto get_cnt;
14a5cf38
JH
2100 }
2101 if (count > 0 && avail <= 0) {
2102 if (PerlIO_fill(f) != 0)
2103 break;
2104 }
93c2c2ec 2105 }
14a5cf38
JH
2106 }
2107 return (buf - (STDCHAR *) vbuf);
2108 }
f6c77cf1 2109 return 0;
f6c77cf1
NIS
2110}
2111
9e353e3b 2112IV
f62ce20a 2113PerlIOBase_noop_ok(pTHX_ PerlIO *f)
9e353e3b 2114{
96a5add6 2115 PERL_UNUSED_CONTEXT;
8772537c 2116 PERL_UNUSED_ARG(f);
14a5cf38 2117 return 0;
9e353e3b
NIS
2118}
2119
2120IV
f62ce20a 2121PerlIOBase_noop_fail(pTHX_ PerlIO *f)
06da4f11 2122{
96a5add6 2123 PERL_UNUSED_CONTEXT;
8772537c 2124 PERL_UNUSED_ARG(f);
14a5cf38 2125 return -1;
06da4f11
NIS
2126}
2127
2128IV
f62ce20a 2129PerlIOBase_close(pTHX_ PerlIO *f)
9e353e3b 2130{
37725cdc
NIS
2131 IV code = -1;
2132 if (PerlIOValid(f)) {
2133 PerlIO *n = PerlIONext(f);
2134 code = PerlIO_flush(f);
2135 PerlIOBase(f)->flags &=
2136 ~(PERLIO_F_CANREAD | PERLIO_F_CANWRITE | PERLIO_F_OPEN);
2137 while (PerlIOValid(n)) {
de009b76 2138 const PerlIO_funcs * const tab = PerlIOBase(n)->tab;
37725cdc
NIS
2139 if (tab && tab->Close) {
2140 if ((*tab->Close)(aTHX_ n) != 0)
2141 code = -1;
2142 break;
2143 }
2144 else {
2145 PerlIOBase(n)->flags &=
2146 ~(PERLIO_F_CANREAD | PERLIO_F_CANWRITE | PERLIO_F_OPEN);
2147 }
2148 n = PerlIONext(n);
2149 }
2150 }
2151 else {
2152 SETERRNO(EBADF, SS_IVCHAN);
2153 }
14a5cf38 2154 return code;
9e353e3b
NIS
2155}
2156
2157IV
f62ce20a 2158PerlIOBase_eof(pTHX_ PerlIO *f)
9e353e3b 2159{
96a5add6 2160 PERL_UNUSED_CONTEXT;
04892f78 2161 if (PerlIOValid(f)) {
14a5cf38
JH
2162 return (PerlIOBase(f)->flags & PERLIO_F_EOF) != 0;
2163 }
2164 return 1;
9e353e3b
NIS
2165}
2166
2167IV
f62ce20a 2168PerlIOBase_error(pTHX_ PerlIO *f)
9e353e3b 2169{
96a5add6 2170 PERL_UNUSED_CONTEXT;
04892f78 2171 if (PerlIOValid(f)) {
14a5cf38
JH
2172 return (PerlIOBase(f)->flags & PERLIO_F_ERROR) != 0;
2173 }
2174 return 1;
9e353e3b
NIS
2175}
2176
2177void
f62ce20a 2178PerlIOBase_clearerr(pTHX_ PerlIO *f)
9e353e3b 2179{
04892f78 2180 if (PerlIOValid(f)) {
dcda55fc 2181 PerlIO * const n = PerlIONext(f);
14a5cf38 2182 PerlIOBase(f)->flags &= ~(PERLIO_F_ERROR | PERLIO_F_EOF);
04892f78 2183 if (PerlIOValid(n))
14a5cf38
JH
2184 PerlIO_clearerr(n);
2185 }
9e353e3b
NIS
2186}
2187
2188void
f62ce20a 2189PerlIOBase_setlinebuf(pTHX_ PerlIO *f)
9e353e3b 2190{
96a5add6 2191 PERL_UNUSED_CONTEXT;
04892f78 2192 if (PerlIOValid(f)) {
14a5cf38
JH
2193 PerlIOBase(f)->flags |= PERLIO_F_LINEBUF;
2194 }
9e353e3b
NIS
2195}
2196
93a8090d
NIS
2197SV *
2198PerlIO_sv_dup(pTHX_ SV *arg, CLONE_PARAMS *param)
2199{
2200 if (!arg)
a0714e2c 2201 return NULL;
24d147a6 2202#ifdef USE_ITHREADS
93a8090d 2203 if (param) {
a951d81d
BL
2204 arg = sv_dup(arg, param);
2205 SvREFCNT_inc_simple_void_NN(arg);
2206 return arg;
93a8090d
NIS
2207 }
2208 else {
2209 return newSVsv(arg);
2210 }
2211#else
1b6737cc 2212 PERL_UNUSED_ARG(param);
93a8090d
NIS
2213 return newSVsv(arg);
2214#endif
2215}
2216
2217PerlIO *
ecdeb87c 2218PerlIOBase_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
93a8090d 2219{
1b6737cc 2220 PerlIO * const nexto = PerlIONext(o);
04892f78 2221 if (PerlIOValid(nexto)) {
de009b76 2222 const PerlIO_funcs * const tab = PerlIOBase(nexto)->tab;
37725cdc
NIS
2223 if (tab && tab->Dup)
2224 f = (*tab->Dup)(aTHX_ f, nexto, param, flags);
2225 else
2226 f = PerlIOBase_dup(aTHX_ f, nexto, param, flags);
93a8090d
NIS
2227 }
2228 if (f) {
dcda55fc 2229 PerlIO_funcs * const self = PerlIOBase(o)->tab;
a951d81d 2230 SV *arg = NULL;
93a8090d 2231 char buf[8];
316ebaf2 2232 assert(self);
e17bc05a
TC
2233 DEBUG_i(PerlIO_debug("PerlIOBase_dup %s f=%p o=%p param=%p\n",
2234 self->name,
2235 (void*)f, (void*)o, (void*)param) );
27e6dabe
JH
2236 if (self->Getarg)
2237 arg = (*self->Getarg)(aTHX_ o, param, flags);
93a8090d 2238 f = PerlIO_push(aTHX_ f, self, PerlIO_modestr(o,buf), arg);
df8c7dee 2239 if (f && PerlIOBase(o)->flags & PERLIO_F_UTF8)
f0720f70 2240 PerlIOBase(f)->flags |= PERLIO_F_UTF8;
ef8d46e8 2241 SvREFCNT_dec(arg);
93a8090d
NIS
2242 }
2243 return f;
2244}
2245
27da23d5 2246/* PL_perlio_fd_refcnt[] is in intrpvar.h */
93a8090d 2247
8b84d7dd 2248/* Must be called with PL_perlio_mutex locked. */
22c96fc1 2249static void
ff25d7bc
JH
2250S_more_refcounted_fds(pTHX_ const int new_fd)
2251 PERL_TSA_REQUIRES(PL_perlio_mutex)
2252{
7a89be66 2253 dVAR;
22c96fc1 2254 const int old_max = PL_perlio_fd_refcnt_size;
f4ae5be6 2255 const int new_max = 16 + (new_fd & ~15);
22c96fc1
NC
2256 int *new_array;
2257
dd791c72
JH
2258#ifndef PERL_IMPLICIT_SYS
2259 PERL_UNUSED_CONTEXT;
2260#endif
2261
e17bc05a
TC
2262 DEBUG_i( PerlIO_debug("More fds - old=%d, need %d, new=%d\n",
2263 old_max, new_fd, new_max) );
22c96fc1
NC
2264
2265 if (new_fd < old_max) {
2266 return;
2267 }
2268
f4ae5be6
NC
2269 assert (new_max > new_fd);
2270
eae082a0
JH
2271 /* Use plain realloc() since we need this memory to be really
2272 * global and visible to all the interpreters and/or threads. */
2273 new_array = (int*) realloc(PL_perlio_fd_refcnt, new_max * sizeof(int));
22c96fc1
NC
2274
2275 if (!new_array) {
8b84d7dd 2276#ifdef USE_ITHREADS
6cb8cb21 2277 MUTEX_UNLOCK(&PL_perlio_mutex);
22c96fc1 2278#endif
4cbe3a7d 2279 croak_no_mem();
22c96fc1
NC
2280 }
2281
2282 PL_perlio_fd_refcnt_size = new_max;
2283 PL_perlio_fd_refcnt = new_array;
2284
e17bc05a
TC
2285 DEBUG_i( PerlIO_debug("Zeroing %p, %d\n",
2286 (void*)(new_array + old_max),
2287 new_max - old_max) );
22c96fc1
NC
2288
2289 Zero(new_array + old_max, new_max - old_max, int);
2290}
2291
2292
93a8090d
NIS
2293void
2294PerlIO_init(pTHX)
2295{
8b84d7dd 2296 /* MUTEX_INIT(&PL_perlio_mutex) is done in PERL_SYS_INIT3(). */
96a5add6 2297 PERL_UNUSED_CONTEXT;
93a8090d
NIS
2298}
2299
168d5872
NIS
2300void
2301PerlIOUnix_refcnt_inc(int fd)
2302{
27da23d5 2303 dTHX;
22c96fc1 2304 if (fd >= 0) {
97aff369 2305 dVAR;
22c96fc1 2306
8b84d7dd 2307#ifdef USE_ITHREADS
6cb8cb21 2308 MUTEX_LOCK(&PL_perlio_mutex);
168d5872 2309#endif
22c96fc1
NC
2310 if (fd >= PL_perlio_fd_refcnt_size)
2311 S_more_refcounted_fds(aTHX_ fd);
2312
27da23d5 2313 PL_perlio_fd_refcnt[fd]++;
8b84d7dd 2314 if (PL_perlio_fd_refcnt[fd] <= 0) {
12605ff9 2315 /* diag_listed_as: refcnt_inc: fd %d%s */
8b84d7dd
RGS
2316 Perl_croak(aTHX_ "refcnt_inc: fd %d: %d <= 0\n",
2317 fd, PL_perlio_fd_refcnt[fd]);
2318 }
e17bc05a
TC
2319 DEBUG_i( PerlIO_debug("refcnt_inc: fd %d refcnt=%d\n",
2320 fd, PL_perlio_fd_refcnt[fd]) );
22c96fc1 2321
8b84d7dd 2322#ifdef USE_ITHREADS
6cb8cb21 2323 MUTEX_UNLOCK(&PL_perlio_mutex);
168d5872 2324#endif
8b84d7dd 2325 } else {
12605ff9 2326 /* diag_listed_as: refcnt_inc: fd %d%s */
8b84d7dd 2327 Perl_croak(aTHX_ "refcnt_inc: fd %d < 0\n", fd);
168d5872
NIS
2328 }
2329}
2330
168d5872
NIS
2331int
2332PerlIOUnix_refcnt_dec(int fd)
2333{
2334 int cnt = 0;
22c96fc1 2335 if (fd >= 0) {
e17bc05a
TC
2336#ifdef DEBUGGING
2337 dTHX;
2338#else
97aff369 2339 dVAR;
e17bc05a 2340#endif
8b84d7dd 2341#ifdef USE_ITHREADS
6cb8cb21 2342 MUTEX_LOCK(&PL_perlio_mutex);
168d5872 2343#endif
8b84d7dd 2344 if (fd >= PL_perlio_fd_refcnt_size) {
12605ff9 2345 /* diag_listed_as: refcnt_dec: fd %d%s */
2bcd6579 2346 Perl_croak_nocontext("refcnt_dec: fd %d >= refcnt_size %d\n",
8b84d7dd
RGS
2347 fd, PL_perlio_fd_refcnt_size);
2348 }
2349 if (PL_perlio_fd_refcnt[fd] <= 0) {
12605ff9 2350 /* diag_listed_as: refcnt_dec: fd %d%s */
2bcd6579 2351 Perl_croak_nocontext("refcnt_dec: fd %d: %d <= 0\n",
8b84d7dd
RGS
2352 fd, PL_perlio_fd_refcnt[fd]);
2353 }
27da23d5 2354 cnt = --PL_perlio_fd_refcnt[fd];
e17bc05a 2355 DEBUG_i( PerlIO_debug("refcnt_dec: fd %d refcnt=%d\n", fd, cnt) );
8b84d7dd 2356#ifdef USE_ITHREADS
6cb8cb21 2357 MUTEX_UNLOCK(&PL_perlio_mutex);
168d5872 2358#endif
8b84d7dd 2359 } else {
12605ff9 2360 /* diag_listed_as: refcnt_dec: fd %d%s */
2bcd6579 2361 Perl_croak_nocontext("refcnt_dec: fd %d < 0\n", fd);
168d5872
NIS
2362 }
2363 return cnt;
2364}
2365
2e0cfa16
FC
2366int
2367PerlIOUnix_refcnt(int fd)
2368{
2369 dTHX;
2370 int cnt = 0;
2371 if (fd >= 0) {
2372 dVAR;
2373#ifdef USE_ITHREADS
2374 MUTEX_LOCK(&PL_perlio_mutex);
2375#endif
2376 if (fd >= PL_perlio_fd_refcnt_size) {
2377 /* diag_listed_as: refcnt: fd %d%s */
2378 Perl_croak(aTHX_ "refcnt: fd %d >= refcnt_size %d\n",
2379 fd, PL_perlio_fd_refcnt_size);
2380 }
2381 if (PL_perlio_fd_refcnt[fd] <= 0) {
2382 /* diag_listed_as: refcnt: fd %d%s */
2383 Perl_croak(aTHX_ "refcnt: fd %d: %d <= 0\n",
2384 fd, PL_perlio_fd_refcnt[fd]);
2385 }
2386 cnt = PL_perlio_fd_refcnt[fd];
2387#ifdef USE_ITHREADS
2388 MUTEX_UNLOCK(&PL_perlio_mutex);
2389#endif
2390 } else {
2391 /* diag_listed_as: refcnt: fd %d%s */
2392 Perl_croak(aTHX_ "refcnt: fd %d < 0\n", fd);
2393 }
2394 return cnt;
2395}
2396
694c95cf
JH
2397void
2398PerlIO_cleanup(pTHX)
2399{
2400 int i;
2401#ifdef USE_ITHREADS
e17bc05a 2402 DEBUG_i( PerlIO_debug("Cleanup layers for %p\n",(void*)aTHX) );
9f4bd222 2403#else
e17bc05a 2404 DEBUG_i( PerlIO_debug("Cleanup layers\n") );
694c95cf 2405#endif
e47547a8 2406
694c95cf
JH
2407 /* Raise STDIN..STDERR refcount so we don't close them */
2408 for (i=0; i < 3; i++)
2409 PerlIOUnix_refcnt_inc(i);
2410 PerlIO_cleantable(aTHX_ &PL_perlio);
2411 /* Restore STDIN..STDERR refcount */
2412 for (i=0; i < 3; i++)
2413 PerlIOUnix_refcnt_dec(i);
9f4bd222
NIS
2414
2415 if (PL_known_layers) {
2416 PerlIO_list_free(aTHX_ PL_known_layers);
2417 PL_known_layers = NULL;
2418 }
27da23d5 2419 if (PL_def_layerlist) {
9f4bd222
NIS
2420 PerlIO_list_free(aTHX_ PL_def_layerlist);
2421 PL_def_layerlist = NULL;
2422 }
6cb8cb21
RGS
2423}
2424
0934c9d9 2425void PerlIO_teardown(void) /* Call only from PERL_SYS_TERM(). */
6cb8cb21 2426{
53d44271 2427 dVAR;
4f3da17a
DM
2428#if 0
2429/* XXX we can't rely on an interpreter being present at this late stage,
2430 XXX so we can't use a function like PerlLIO_write that relies on one
2431 being present (at least in win32) :-(.
2432 Disable for now.
2433*/
6cb8cb21
RGS
2434#ifdef DEBUGGING
2435 {
2436 /* By now all filehandles should have been closed, so any
2437 * stray (non-STD-)filehandles indicate *possible* (PerlIO)
2438 * errors. */
77db880c
JH
2439#define PERLIO_TEARDOWN_MESSAGE_BUF_SIZE 64
2440#define PERLIO_TEARDOWN_MESSAGE_FD 2
2441 char buf[PERLIO_TEARDOWN_MESSAGE_BUF_SIZE];
6cb8cb21
RGS
2442 int i;
2443 for (i = 3; i < PL_perlio_fd_refcnt_size; i++) {
77db880c
JH
2444 if (PL_perlio_fd_refcnt[i]) {
2445 const STRLEN len =
2446 my_snprintf(buf, sizeof(buf),
2447 "PerlIO_teardown: fd %d refcnt=%d\n",
2448 i, PL_perlio_fd_refcnt[i]);
2449 PerlLIO_write(PERLIO_TEARDOWN_MESSAGE_FD, buf, len);
2450 }
6cb8cb21
RGS
2451 }
2452 }
2453#endif
4f3da17a 2454#endif
eae082a0
JH
2455 /* Not bothering with PL_perlio_mutex since by now
2456 * all the interpreters are gone. */
1cd82952
RGS
2457 if (PL_perlio_fd_refcnt_size /* Assuming initial size of zero. */
2458 && PL_perlio_fd_refcnt) {
eae082a0 2459 free(PL_perlio_fd_refcnt); /* To match realloc() in S_more_refcounted_fds(). */
432ce874
YO
2460 PL_perlio_fd_refcnt = NULL;
2461 PL_perlio_fd_refcnt_size = 0;
1cd82952 2462 }
694c95cf
JH
2463}
2464
9e353e3b 2465/*--------------------------------------------------------------------------------------*/
14a5cf38 2466/*
71200d45 2467 * Bottom-most level for UNIX-like case
14a5cf38 2468 */
9e353e3b 2469
14a5cf38 2470typedef struct {
22569500
NIS
2471 struct _PerlIO base; /* The generic part */
2472 int fd; /* UNIX like file descriptor */
2473 int oflags; /* open/fcntl flags */
9e353e3b
NIS
2474} PerlIOUnix;
2475
abf9167d
DM
2476static void
2477S_lockcnt_dec(pTHX_ const void* f)
2478{
dd791c72
JH
2479#ifndef PERL_IMPLICIT_SYS
2480 PERL_UNUSED_CONTEXT;
2481#endif
abf9167d
DM
2482 PerlIO_lockcnt((PerlIO*)f)--;
2483}
2484
2485
2486/* call the signal handler, and if that handler happens to clear
2487 * this handle, free what we can and return true */
2488
2489static bool
2490S_perlio_async_run(pTHX_ PerlIO* f) {
2491 ENTER;
2492 SAVEDESTRUCTOR_X(S_lockcnt_dec, (void*)f);
2493 PerlIO_lockcnt(f)++;
2494 PERL_ASYNC_CHECK();
be48bbe8
CS
2495 if ( !(PerlIOBase(f)->flags & PERLIO_F_CLEARED) ) {
2496 LEAVE;
abf9167d 2497 return 0;
be48bbe8 2498 }
abf9167d
DM
2499 /* we've just run some perl-level code that could have done
2500 * anything, including closing the file or clearing this layer.
2501 * If so, free any lower layers that have already been
2502 * cleared, then return an error. */
2503 while (PerlIOValid(f) &&
2504 (PerlIOBase(f)->flags & PERLIO_F_CLEARED))
2505 {
2506 const PerlIOl *l = *f;
2507 *f = l->next;
2508 Safefree(l);
2509 }
be48bbe8 2510 LEAVE;
abf9167d
DM
2511 return 1;
2512}
2513
6f9d8c32 2514int
9e353e3b 2515PerlIOUnix_oflags(const char *mode)
760ac839 2516{
14a5cf38 2517 int oflags = -1;
3b6c1aba 2518 if (*mode == IoTYPE_IMPLICIT || *mode == IoTYPE_NUMERIC)
14a5cf38
JH
2519 mode++;
2520 switch (*mode) {
2521 case 'r':
2522 oflags = O_RDONLY;
2523 if (*++mode == '+') {
2524 oflags = O_RDWR;
2525 mode++;
2526 }
2527 break;
2528
2529 case 'w':
2530 oflags = O_CREAT | O_TRUNC;
2531 if (*++mode == '+') {
2532 oflags |= O_RDWR;
2533 mode++;
2534 }
2535 else
2536 oflags |= O_WRONLY;
2537 break;
2538
2539 case 'a':
2540 oflags = O_CREAT | O_APPEND;
2541 if (*++mode == '+') {
2542 oflags |= O_RDWR;
2543 mode++;
2544 }
2545 else
2546 oflags |= O_WRONLY;
2547 break;
2548 }
43e5477e
JH
2549
2550 /* XXX TODO: PerlIO_open() test that exercises 'rb' and 'rt'. */
2551
2552 /* Unless O_BINARY is different from O_TEXT, first bit-or:ing one
2553 * of them in, and then bit-and-masking the other them away, won't
2554 * have much of an effect. */
2555 switch (*mode) {
2556 case 'b':
2557#if O_TEXT != O_BINARY
2558 oflags |= O_BINARY;
14a5cf38 2559 oflags &= ~O_TEXT;
43e5477e
JH
2560#endif
2561 mode++;
2562 break;
2563 case 't':
2564#if O_TEXT != O_BINARY
14a5cf38
JH
2565 oflags |= O_TEXT;
2566 oflags &= ~O_BINARY;
43e5477e
JH
2567#endif
2568 mode++;
2569 break;
2570 default:
2571# if O_BINARY != 0
2572 /* bit-or:ing with zero O_BINARY would be useless. */
93f31ee9
PG
2573 /*
2574 * If neither "t" nor "b" was specified, open the file
2575 * in O_BINARY mode.
43e5477e
JH
2576 *
2577 * Note that if something else than the zero byte was seen
2578 * here (e.g. bogus mode "rx"), just few lines later we will
2579 * set the errno and invalidate the flags.
93f31ee9
PG
2580 */
2581 oflags |= O_BINARY;
43e5477e
JH
2582# endif
2583 break;
93f31ee9 2584 }
14a5cf38 2585 if (*mode || oflags == -1) {
93189314 2586 SETERRNO(EINVAL, LIB_INVARG);
14a5cf38
JH
2587 oflags = -1;
2588 }
2589 return oflags;
9e353e3b
NIS
2590}
2591
2592IV
f62ce20a 2593PerlIOUnix_fileno(pTHX_ PerlIO *f)
9e353e3b 2594{
96a5add6 2595 PERL_UNUSED_CONTEXT;
14a5cf38 2596 return PerlIOSelf(f, PerlIOUnix)->fd;
9e353e3b
NIS
2597}
2598
aa063c35
NIS
2599static void
2600PerlIOUnix_setfd(pTHX_ PerlIO *f, int fd, int imode)
4b803d04 2601{
de009b76 2602 PerlIOUnix * const s = PerlIOSelf(f, PerlIOUnix);
6caa5a9c 2603#if defined(WIN32)
aa063c35
NIS
2604 Stat_t st;
2605 if (PerlLIO_fstat(fd, &st) == 0) {
6caa5a9c 2606 if (!S_ISREG(st.st_mode)) {
e17bc05a 2607 DEBUG_i( PerlIO_debug("%d is not regular file\n",fd) );
6caa5a9c
NIS
2608 PerlIOBase(f)->flags |= PERLIO_F_NOTREG;
2609 }
aa063c35 2610 else {
e17bc05a 2611 DEBUG_i( PerlIO_debug("%d _is_ a regular file\n",fd) );
aa063c35 2612 }
6caa5a9c
NIS
2613 }
2614#endif
aa063c35
NIS
2615 s->fd = fd;
2616 s->oflags = imode;
2617 PerlIOUnix_refcnt_inc(fd);
96a5add6 2618 PERL_UNUSED_CONTEXT;
aa063c35
NIS
2619}
2620
2621IV
2622PerlIOUnix_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
2623{
2624 IV code = PerlIOBase_pushed(aTHX_ f, mode, arg, tab);
14a5cf38 2625 if (*PerlIONext(f)) {
4b069b44 2626 /* We never call down so do any pending stuff now */
03c0554d 2627 PerlIO_flush(PerlIONext(f));
14a5cf38 2628 /*
71200d45 2629 * XXX could (or should) we retrieve the oflags from the open file
14a5cf38 2630 * handle rather than believing the "mode" we are passed in? XXX
71200d45 2631 * Should the value on NULL mode be 0 or -1?
14a5cf38 2632 */
acbd16bf 2633 PerlIOUnix_setfd(aTHX_ f, PerlIO_fileno(PerlIONext(f)),
aa063c35 2634 mode ? PerlIOUnix_oflags(mode) : -1);
14a5cf38
JH
2635 }
2636 PerlIOBase(f)->flags |= PERLIO_F_OPEN;
6caa5a9c 2637
14a5cf38 2638 return code;
4b803d04
NIS
2639}
2640
c2fcde81
JH
2641IV
2642PerlIOUnix_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
2643{
de009b76 2644 const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
0723351e 2645 Off_t new_loc;
96a5add6 2646 PERL_UNUSED_CONTEXT;
c2fcde81
JH
2647 if (PerlIOBase(f)->flags & PERLIO_F_NOTREG) {
2648#ifdef ESPIPE
2649 SETERRNO(ESPIPE, LIB_INVARG);
2650#else
2651 SETERRNO(EINVAL, LIB_INVARG);
2652#endif
2653 return -1;
2654 }
0723351e
NC
2655 new_loc = PerlLIO_lseek(fd, offset, whence);
2656 if (new_loc == (Off_t) - 1)
dcda55fc 2657 return -1;
c2fcde81
JH
2658 PerlIOBase(f)->flags &= ~PERLIO_F_EOF;
2659 return 0;
2660}
2661
9e353e3b 2662PerlIO *
14a5cf38
JH
2663PerlIOUnix_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers,
2664 IV n, const char *mode, int fd, int imode,
2665 int perm, PerlIO *f, int narg, SV **args)
2666{
d9dac8cd 2667 if (PerlIOValid(f)) {
cc6623a8 2668 if (PerlIOBase(f)->tab && PerlIOBase(f)->flags & PERLIO_F_OPEN)
f62ce20a 2669 (*PerlIOBase(f)->tab->Close)(aTHX_ f);
14a5cf38
JH
2670 }
2671 if (narg > 0) {
3b6c1aba 2672 if (*mode == IoTYPE_NUMERIC)
14a5cf38
JH
2673 mode++;
2674 else {
2675 imode = PerlIOUnix_oflags(mode);
5e2ce0f3
CB
2676#ifdef VMS
2677 perm = 0777; /* preserve RMS defaults, ACL inheritance, etc. */
2678#else
14a5cf38 2679 perm = 0666;
5e2ce0f3 2680#endif
14a5cf38
JH
2681 }
2682 if (imode != -1) {
41188aa0
TC
2683 STRLEN len;
2684 const char *path = SvPV_const(*args, len);
2685 if (!IS_SAFE_PATHNAME(path, len, "open"))
c8028aa6 2686 return NULL;
14a5cf38
JH
2687 fd = PerlLIO_open3(path, imode, perm);
2688 }
2689 }
2690 if (fd >= 0) {
3b6c1aba 2691 if (*mode == IoTYPE_IMPLICIT)
14a5cf38
JH
2692 mode++;
2693 if (!f) {
2694 f = PerlIO_allocate(aTHX);
d9dac8cd
NIS
2695 }
2696 if (!PerlIOValid(f)) {
a33cf58c 2697 if (!(f = PerlIO_push(aTHX_ f, self, mode, PerlIOArg))) {
0a20f69b 2698 PerlLIO_close(fd);
a33cf58c
NIS
2699 return NULL;
2700 }
d9dac8cd 2701 }
aa063c35 2702 PerlIOUnix_setfd(aTHX_ f, fd, imode);
14a5cf38 2703 PerlIOBase(f)->flags |= PERLIO_F_OPEN;
c2fcde81
JH
2704 if (*mode == IoTYPE_APPEND)
2705 PerlIOUnix_seek(aTHX_ f, 0, SEEK_END);
14a5cf38
JH
2706 return f;
2707 }
2708 else {
2709 if (f) {
6f207bd3 2710 NOOP;
14a5cf38 2711 /*
71200d45 2712 * FIXME: pop layers ???
14a5cf38
JH
2713 */
2714 }
2715 return NULL;
2716 }
9e353e3b
NIS
2717}
2718
71200d45 2719PerlIO *
ecdeb87c 2720PerlIOUnix_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
71200d45 2721{
dcda55fc 2722 const PerlIOUnix * const os = PerlIOSelf(o, PerlIOUnix);
93a8090d 2723 int fd = os->fd;
ecdeb87c
NIS
2724 if (flags & PERLIO_DUP_FD) {
2725 fd = PerlLIO_dup(fd);
2726 }
22c96fc1 2727 if (fd >= 0) {
ecdeb87c 2728 f = PerlIOBase_dup(aTHX_ f, o, param, flags);
71200d45
NIS
2729 if (f) {
2730 /* If all went well overwrite fd in dup'ed lay with the dup()'ed fd */
aa063c35 2731 PerlIOUnix_setfd(aTHX_ f, fd, os->oflags);
71200d45
NIS
2732 return f;
2733 }
0a20f69b 2734 PerlLIO_close(fd);
71200d45
NIS
2735 }
2736 return NULL;
2737}
2738
2739
9e353e3b 2740SSize_t
f62ce20a 2741PerlIOUnix_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
9e353e3b 2742{
abf9167d
DM
2743 int fd;
2744 if (PerlIO_lockcnt(f)) /* in use: abort ungracefully */
2745 return -1;
2746 fd = PerlIOSelf(f, PerlIOUnix)->fd;
27da23d5
JH
2747#ifdef PERLIO_STD_SPECIAL
2748 if (fd == 0)
2749 return PERLIO_STD_IN(fd, vbuf, count);
2750#endif
81428673 2751 if (!(PerlIOBase(f)->flags & PERLIO_F_CANREAD) ||
1fd8f4ce 2752 PerlIOBase(f)->flags & (PERLIO_F_EOF|PERLIO_F_ERROR)) {
263df5f1 2753 return 0;
1fd8f4ce 2754 }
14a5cf38 2755 while (1) {
b464bac0 2756 const SSize_t len = PerlLIO_read(fd, vbuf, count);
14a5cf38 2757 if (len >= 0 || errno != EINTR) {
ba85f2ea
NIS
2758 if (len < 0) {
2759 if (errno != EAGAIN) {
2760 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
0ea86a10 2761 PerlIO_save_errno(f);
ba85f2ea
NIS
2762 }
2763 }
2764 else if (len == 0 && count != 0) {
14a5cf38 2765 PerlIOBase(f)->flags |= PERLIO_F_EOF;
ba85f2ea
NIS
2766 SETERRNO(0,0);
2767 }
14a5cf38
JH
2768 return len;
2769 }
abf9167d
DM
2770 /* EINTR */
2771 if (PL_sig_pending && S_perlio_async_run(aTHX_ f))
2772 return -1;
14a5cf38 2773 }
e5964223 2774 NOT_REACHED; /*NOTREACHED*/
9e353e3b
NIS
2775}
2776
2777SSize_t
f62ce20a 2778PerlIOUnix_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 2779{
abf9167d
DM
2780 int fd;
2781 if (PerlIO_lockcnt(f)) /* in use: abort ungracefully */
2782 return -1;
2783 fd = PerlIOSelf(f, PerlIOUnix)->fd;
27da23d5
JH
2784#ifdef PERLIO_STD_SPECIAL
2785 if (fd == 1 || fd == 2)
2786 return PERLIO_STD_OUT(fd, vbuf, count);
2787#endif
14a5cf38 2788 while (1) {
de009b76 2789 const SSize_t len = PerlLIO_write(fd, vbuf, count);
14a5cf38 2790 if (len >= 0 || errno != EINTR) {
ba85f2ea
NIS
2791 if (len < 0) {
2792 if (errno != EAGAIN) {
2793 PerlIOBase(f)->flags |= PERLIO_F_ERROR;
0ea86a10 2794 PerlIO_save_errno(f);
ba85f2ea
NIS
2795 }
2796 }
14a5cf38
JH
2797 return len;
2798 }
abf9167d
DM
2799 /* EINTR */
2800 if (PL_sig_pending && S_perlio_async_run(aTHX_ f))
2801 return -1;
06da4f11 2802 }
e5964223 2803 NOT_REACHED; /*NOTREACHED*/
9e353e3b
NIS
2804}
2805
9e353e3b 2806Off_t
f62ce20a 2807PerlIOUnix_tell(pTHX_ PerlIO *f)
9e353e3b 2808{
96a5add6
AL
2809 PERL_UNUSED_CONTEXT;
2810
14a5cf38 2811 return PerlLIO_lseek(PerlIOSelf(f, PerlIOUnix)->fd, 0, SEEK_CUR);
9e353e3b
NIS
2812}
2813
2556f95e
GF
2814
2815IV
2376d97d 2816PerlIOUnix_close(pTHX_ PerlIO *f)
2556f95e 2817{
de009b76 2818 const int fd = PerlIOSelf(f, PerlIOUnix)->fd;
14a5cf38 2819 int code = 0;
168d5872
NIS
2820 if (PerlIOBase(f)->flags & PERLIO_F_OPEN) {
2821 if (PerlIOUnix_refcnt_dec(fd) > 0) {
93a8090d
NIS
2822 PerlIOBase(f)->flags &= ~PERLIO_F_OPEN;
2823 return 0;
22569500 2824 }
93a8090d
NIS
2825 }
2826 else {
93189314 2827 SETERRNO(EBADF,SS_IVCHAN);
93a8090d
NIS
2828 return -1;
2829 }
14a5cf38
JH
2830 while (PerlLIO_close(fd) != 0) {
2831 if (errno != EINTR) {
2832 code = -1;
2833 break;
2834 }
abf9167d
DM
2835 /* EINTR */
2836 if (PL_sig_pending && S_perlio_async_run(aTHX_ f))
2837 return -1;
14a5cf38
JH
2838 }
2839 if (code == 0) {
2840 PerlIOBase(f)->flags &= ~PERLIO_F_OPEN;
2841 }
2842 return code;
9e353e3b
NIS
2843}
2844
27da23d5 2845PERLIO_FUNCS_DECL(PerlIO_unix) = {
2dc2558e 2846 sizeof(PerlIO_funcs),
14a5cf38
JH
2847 "unix",
2848 sizeof(PerlIOUnix),
2849 PERLIO_K_RAW,
2850 PerlIOUnix_pushed,
2376d97d 2851 PerlIOBase_popped,
14a5cf38 2852 PerlIOUnix_open,
86e05cf2 2853 PerlIOBase_binmode, /* binmode */
14a5cf38
JH
2854 NULL,
2855 PerlIOUnix_fileno,
71200d45 2856 PerlIOUnix_dup,
14a5cf38
JH
2857 PerlIOUnix_read,
2858 PerlIOBase_unread,
2859 PerlIOUnix_write,
2860 PerlIOUnix_seek,
2861 PerlIOUnix_tell,
2862 PerlIOUnix_close,
22569500
NIS
2863 PerlIOBase_noop_ok, /* flush */
2864 PerlIOBase_noop_fail, /* fill */
14a5cf38
JH
2865 PerlIOBase_eof,
2866 PerlIOBase_error,
2867 PerlIOBase_clearerr,
2868 PerlIOBase_setlinebuf,
22569500
NIS
2869 NULL, /* get_base */
2870 NULL, /* get_bufsiz */
2871 NULL, /* get_ptr */
2872 NULL, /* get_cnt */
2873 NULL, /* set_ptrcnt */
9e353e3b
NIS
2874};
2875
2876/*--------------------------------------------------------------------------------------*/
14a5cf38 2877/*
71200d45 2878 * stdio as a layer
14a5cf38 2879 */
9e353e3b 2880
313e59c8
NIS
2881#if defined(VMS) && !defined(STDIO_BUFFER_WRITABLE)
2882/* perl5.8 - This ensures the last minute VMS ungetc fix is not
2883 broken by the last second glibc 2.3 fix
2884 */
2885#define STDIO_BUFFER_WRITABLE
2886#endif
2887
2888
14a5cf38
JH
2889typedef struct {
2890 struct _PerlIO base;
22569500 2891 FILE *stdio; /* The stream */
9e353e3b
NIS
2892} PerlIOStdio;
2893
2894IV
f62ce20a 2895PerlIOStdio_fileno(pTHX_ PerlIO *f)
9e353e3b 2896{
96a5add6
AL
2897 PERL_UNUSED_CONTEXT;
2898
c4420975
AL
2899 if (PerlIOValid(f)) {
2900 FILE * const s = PerlIOSelf(f, PerlIOStdio)->stdio;
2901 if (s)
2902 return PerlSIO_fileno(s);
439ba545
NIS
2903 }
2904 errno = EBADF;
2905 return -1;
9e353e3b
NIS
2906}
2907
766a733e 2908char *
14a5cf38
JH
2909PerlIOStdio_mode(const char *mode, char *tmode)
2910{
de009b76 2911 char * const ret = tmode;
a0625d38
SR
2912 if (mode) {
2913 while (*mode) {
2914 *tmode++ = *mode++;
2915 }
14a5cf38 2916 }
95005ad8 2917#if defined(PERLIO_USING_CRLF) || defined(__CYGWIN__)
6ce75a77
JH
2918 *tmode++ = 'b';
2919#endif
14a5cf38
JH
2920 *tmode = '\0';
2921 return ret;
2922}
2923
4b803d04 2924IV
2dc2558e 2925PerlIOStdio_pushed(pTHX_ PerlIO *f, const char *mode, SV *arg, PerlIO_funcs *tab)
4b803d04 2926{
1fd8f4ce
NIS
2927 PerlIO *n;
2928 if (PerlIOValid(f) && PerlIOValid(n = PerlIONext(f))) {
46c461b5 2929 PerlIO_funcs * const toptab = PerlIOBase(n)->tab;
1fd8f4ce
NIS
2930 if (toptab == tab) {
2931 /* Top is already stdio - pop self (duplicate) and use original */
2932 PerlIO_pop(aTHX_ f);
2933 return 0;
2934 } else {
de009b76 2935 const int fd = PerlIO_fileno(n);
1fd8f4ce
NIS
2936 char tmode[8];
2937 FILE *stdio;
81428673 2938 if (fd >= 0 && (stdio = PerlSIO_fdopen(fd,
1fd8f4ce
NIS
2939 mode = PerlIOStdio_mode(mode, tmode)))) {
2940 PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
2941 /* We never call down so do any pending stuff now */
2942 PerlIO_flush(PerlIONext(f));
2a600bb8 2943 return PerlIOBase_pushed(aTHX_ f, mode, arg, tab);
81428673 2944 }
1fd8f4ce
NIS
2945 else {
2946 return -1;
2947 }
2948 }
14a5cf38 2949 }
2dc2558e 2950 return PerlIOBase_pushed(aTHX_ f, mode, arg, tab);
4b803d04
NIS
2951}
2952
22569500 2953
9e353e3b 2954PerlIO *
4b069b44 2955PerlIO_importFILE(FILE *stdio, const char *mode)
9e353e3b 2956{
14a5cf38
JH
2957 dTHX;
2958 PerlIO *f = NULL;
ea5bc90f
YK
2959#ifdef EBCDIC
2960 int rc;
2961 char filename[FILENAME_MAX];
2962 fldata_t fileinfo;
2963#endif
14a5cf38 2964 if (stdio) {
22569500 2965 PerlIOStdio *s;
375ed12a
JH
2966 int fd0 = fileno(stdio);
2967 if (fd0 < 0) {
ea5bc90f
YK
2968#ifdef EBCDIC
2969 rc = fldata(stdio,filename,&fileinfo);
2970 if(rc != 0){
2971 return NULL;
2972 }
2973 if(fileinfo.__dsorgHFS){
2974 return NULL;
2975 }
2976 /*This MVS dataset , OK!*/
2977#else
375ed12a 2978 return NULL;
ea5bc90f 2979#endif
375ed12a 2980 }
4b069b44
NIS
2981 if (!mode || !*mode) {
2982 /* We need to probe to see how we can open the stream
2983 so start with read/write and then try write and read
2984 we dup() so that we can fclose without loosing the fd.
2985
2986 Note that the errno value set by a failing fdopen
2987 varies between stdio implementations.
2988 */
375ed12a
JH
2989 const int fd = PerlLIO_dup(fd0);
2990 FILE *f2;
2991 if (fd < 0) {
2992 return f;
2993 }
2994 f2 = PerlSIO_fdopen(fd, (mode = "r+"));
4b069b44 2995 if (!f2) {
a33cf58c 2996 f2 = PerlSIO_fdopen(fd, (mode = "w"));
4b069b44
NIS
2997 }
2998 if (!f2) {
a33cf58c 2999 f2 = PerlSIO_fdopen(fd, (mode = "r"));
4b069b44
NIS
3000 }
3001 if (!f2) {
3002 /* Don't seem to be able to open */
3003 PerlLIO_close(fd);
3004 return f;
3005 }
3006 fclose(f2);
22569500 3007 }
de092133 3008 if ((f = PerlIO_push(aTHX_(PerlIO_allocate(aTHX)), PERLIO_FUNCS_CAST(&PerlIO_stdio), mode, NULL))) {
a33cf58c
NIS
3009 s = PerlIOSelf(f, PerlIOStdio);
3010 s->stdio = stdio;
ea5bc90f
YK
3011#ifdef EBCDIC
3012 fd0 = fileno(stdio);
3013 if(fd0 != -1){
3014 PerlIOUnix_refcnt_inc(fd0);
3015 }
3016 else{
3017 rc = fldata(stdio,filename,&fileinfo);
3018 if(rc != 0){
3019 PerlIOUnix_refcnt_inc(fd0);
3020 }
3021 if(fileinfo.__dsorgHFS){
3022 PerlIOUnix_refcnt_inc(fd0);
3023 }
3024 /*This MVS dataset , OK!*/
3025 }
3026#else
c586124f 3027 PerlIOUnix_refcnt_inc(fileno(stdio));
ea5bc90f 3028#endif
a33cf58c 3029 }
14a5cf38
JH
3030 }
3031 return f;
9e353e3b
NIS
3032}
3033
3034PerlIO *
14a5cf38
JH
3035PerlIOStdio_open(pTHX_ PerlIO_funcs *self, PerlIO_list_t *layers,
3036 IV n, const char *mode, int fd, int imode,
3037 int perm, PerlIO *f, int narg, SV **args)
3038{
3039 char tmode[8];
d9dac8cd 3040 if (PerlIOValid(f)) {
41188aa0
TC
3041 STRLEN len;
3042 const char * const path = SvPV_const(*args, len);
dcda55fc 3043 PerlIOStdio * const s = PerlIOSelf(f, PerlIOStdio);
1751d015 3044 FILE *stdio;
41188aa0 3045 if (!IS_SAFE_PATHNAME(path, len, "open"))
c8028aa6 3046 return NULL;
1751d015 3047 PerlIOUnix_refcnt_dec(fileno(s->stdio));
de092133
JH
3048 stdio = PerlSIO_freopen(path, PerlIOStdio_mode(mode, tmode),
3049 s->stdio);
14a5cf38
JH
3050 if (!s->stdio)
3051 return NULL;
3052 s->stdio = stdio;
1751d015 3053 PerlIOUnix_refcnt_inc(fileno(s->stdio));
14a5cf38
JH
3054 return f;
3055 }
3056 else {
3057 if (narg > 0) {
41188aa0
TC
3058 STRLEN len;
3059 const char * const path = SvPV_const(*args, len);
3060 if (!IS_SAFE_PATHNAME(path, len, "open"))
c8028aa6 3061 return NULL;
3b6c1aba 3062 if (*mode == IoTYPE_NUMERIC) {
14a5cf38
JH
3063 mode++;
3064 fd = PerlLIO_open3(path, imode, perm);
3065 }
3066 else {
95005ad8
GH
3067 FILE *stdio;
3068 bool appended = FALSE;
3069#ifdef __CYGWIN__
3070 /* Cygwin wants its 'b' early. */
3071 appended = TRUE;
3072 mode = PerlIOStdio_mode(mode, tmode);
3073#endif
3074 stdio = PerlSIO_fopen(path, mode);
6f0313ac 3075 if (stdio) {
6f0313ac
JH
3076 if (!f) {
3077 f = PerlIO_allocate(aTHX);
3078 }
95005ad8
GH
3079 if (!appended)
3080 mode = PerlIOStdio_mode(mode, tmode);
3081 f = PerlIO_push(aTHX_ f, self, mode, PerlIOArg);
3082 if (f) {
0f0f9e2b
JH
3083 PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
3084 PerlIOUnix_refcnt_inc(fileno(stdio));
3085 } else {
3086 PerlSIO_fclose(stdio);
6f0313ac
JH
3087 }
3088 return f;
3089 }
3090 else {
3091 return NULL;
3092 }
14a5cf38
JH
3093 }
3094 }
3095 if (fd >= 0) {
3096 FILE *stdio = NULL;
3097 int init = 0;
3b6c1aba 3098 if (*mode == IoTYPE_IMPLICIT) {
14a5cf38
JH
3099 init = 1;
3100 mode++;
3101 }
3102 if (init) {
3103 switch (fd) {
3104 case 0:
3105 stdio = PerlSIO_stdin;
3106 break;
3107 case 1:
3108 stdio = PerlSIO_stdout;
3109 break;
3110 case 2:
3111 stdio = PerlSIO_stderr;
3112 break;
3113 }
3114 }
3115 else {
3116 stdio = PerlSIO_fdopen(fd, mode =
3117 PerlIOStdio_mode(mode, tmode));
3118 }
3119 if (stdio) {
d9dac8cd
NIS
3120 if (!f) {
3121 f = PerlIO_allocate(aTHX);
3122 }
a33cf58c 3123 if ((f = PerlIO_push(aTHX_ f, self, mode, PerlIOArg))) {
1a159fba
JH
3124 PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
3125 PerlIOUnix_refcnt_inc(fileno(stdio));
a33cf58c 3126 }
14a5cf38
JH
3127 return f;
3128 }
0a20f69b 3129 PerlLIO_close(fd);
14a5cf38
JH
3130 }
3131 }
ee518936 3132 return NULL;
9e353e3b
NIS
3133}
3134
1751d015 3135PerlIO *
ecdeb87c 3136PerlIOStdio_dup(pTHX_ PerlIO *f, PerlIO *o, CLONE_PARAMS *param, int flags)
1751d015
NIS
3137{
3138 /* This assumes no layers underneath - which is what
3139 happens, but is not how I remember it. NI-S 2001/10/16
3140 */
ecdeb87c 3141 if ((f = PerlIOBase_dup(aTHX_ f, o, param, flags))) {
694c95cf 3142 FILE *stdio = PerlIOSelf(o, PerlIOStdio)->stdio;
de009b76 3143 const int fd = fileno(stdio);
9217ff3f 3144 char mode[8];
ecdeb87c 3145 if (flags & PERLIO_DUP_FD) {
de009b76 3146 const int dfd = PerlLIO_dup(fileno(stdio));
9217ff3f
NIS
3147 if (dfd >= 0) {
3148 stdio = PerlSIO_fdopen(dfd, PerlIO_modestr(o,mode));
3149 goto set_this;
ecdeb87c
NIS
3150 }
3151 else {
6f207bd3 3152 NOOP;
ecdeb87c
NIS
3153 /* FIXME: To avoid messy error recovery if dup fails
3154 re-use the existing stdio as though flag was not set
3155 */
3156 }
3157 }
9217ff3f
NIS
3158 stdio = PerlSIO_fdopen(fd, PerlIO_modestr(o,mode));
3159 set_this:
694c95cf 3160 PerlIOSelf(f, PerlIOStdio)->stdio = stdio;
40596bc5
SP
3161 if(stdio) {
3162 PerlIOUnix_refcnt_inc(fileno(stdio));
3163 }
1751d015
NIS
3164 }
3165 return f;
3166}
3167
0d7a5398
NIS
3168static int
3169PerlIOStdio_invalidate_fileno(pTHX_ FILE *f)
3170{
96a5add6
AL
3171 PERL_UNUSED_CONTEXT;
3172
0d7a5398 3173 /* XXX this could use PerlIO_canset_fileno() and
37725cdc 3174 * PerlIO_set_fileno() support from Configure
0d7a5398 3175 */
36b1c892
AD
3176# if defined(HAS_FDCLOSE)
3177 return fdclose(f, NULL) == 0 ? 1 : 0;
3178# elif defined(__UCLIBC__)
ef8eacb8
AT
3179 /* uClibc must come before glibc because it defines __GLIBC__ as well. */
3180 f->__filedes = -1;
3181 return 1;
3182# elif defined(__GLIBC__)
0d7a5398 3183 /* There may be a better way for GLIBC:
37725cdc 3184 - libio.h defines a flag to not close() on cleanup
0d7a5398
NIS
3185 */
3186 f->_fileno = -1;
3187 return 1;
bdea967c 3188# elif defined(__sun)
f5992bc4 3189 PERL_UNUSED_ARG(f);
cfedb851 3190 return 0;
0d7a5398
NIS
3191# elif defined(__hpux)
3192 f->__fileH = 0xff;
3193 f->__fileL = 0xff;
3194 return 1;
9837d373 3195 /* Next one ->_file seems to be a reasonable fallback, i.e. if
37725cdc 3196 your platform does not have special entry try this one.
9837d373
NIS
3197 [For OSF only have confirmation for Tru64 (alpha)
3198 but assume other OSFs will be similar.]
37725cdc 3199 */
9837d373 3200# elif defined(_AIX) || defined(__osf__) || defined(__irix__)
0d7a5398
NIS
3201 f->_file = -1;
3202 return 1;
3203# elif defined(__FreeBSD__)
3204 /* There may be a better way on FreeBSD:
37725cdc
NIS
3205 - we could insert a dummy func in the _close function entry
3206 f->_close = (int (*)(void *)) dummy_close;
0d7a5398
NIS
3207 */
3208 f->_file = -1;
0c49ea6a
SU
3209 return 1;
3210# elif defined(__OpenBSD__)
3211 /* There may be a better way on OpenBSD:
3212 - we could insert a dummy func in the _close function entry
3213 f->_close = (int (*)(void *)) dummy_close;
3214 */
3215 f->_file = -1;
0d7a5398 3216 return 1;
59ad941d
IZ
3217# elif defined(__EMX__)
3218 /* f->_flags &= ~_IOOPEN; */ /* Will leak stream->_buffer */
3219 f->_handle = -1;
3220 return 1;
0d7a5398
NIS
3221# elif defined(__CYGWIN__)
3222 /* There may be a better way on CYGWIN:
37725cdc
NIS
3223 - we could insert a dummy func in the _close function entry
3224 f->_close = (int (*)(void *)) dummy_close;
0d7a5398
NIS
3225 */
3226 f->_file = -1;
3227 return 1;
3228# elif defined(WIN32)
378eeda7 3229# if defined(UNDER_CE)
b475b3e6
JH
3230 /* WIN_CE does not have access to FILE internals, it hardly has FILE
3231 structure at all
3232 */
0d7a5398 3233# else
1f664ef5 3234 PERLIO_FILE_file(f) = -1;
0d7a5398
NIS
3235# endif
3236 return 1;
3237# else
3238#if 0
37725cdc 3239 /* Sarathy's code did this - we fall back to a dup/dup2 hack
0d7a5398 3240 (which isn't thread safe) instead
37725cdc 3241 */
0d7a5398
NIS
3242# error "Don't know how to set FILE.fileno on your platform"
3243#endif
8772537c 3244 PERL_UNUSED_ARG(f);
0d7a5398
NIS
3245 return 0;
3246# endif
3247}
3248
1751d015 3249IV
f62ce20a 3250PerlIOStdio_close(pTHX_ PerlIO *f)
1751d015 3251{
c4420975 3252 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
439ba545
NIS
3253 if (!stdio) {
3254 errno = EBADF;
3255 return -1;
3256 }
9217ff3f 3257 else {
de009b76 3258 const int fd = fileno(stdio);
0d7a5398 3259 int invalidate = 0;
bbfd922f 3260 IV result = 0;
1d791a44 3261 int dupfd = -1;
4ee39169 3262 dSAVEDERRNO;
a2e578da
MHM
3263#ifdef USE_ITHREADS
3264 dVAR;
3265#endif
0d7a5398 3266#ifdef SOCKS5_VERSION_NAME
37725cdc
NIS
3267 /* Socks lib overrides close() but stdio isn't linked to
3268 that library (though we are) - so we must call close()
3269 on sockets on stdio's behalf.
3270 */
0d7a5398
NIS
3271 int optval;
3272 Sock_size_t optlen = sizeof(int);
6b4ce6c8 3273 if (getsockopt(fd, SOL_SOCKET, SO_TYPE, (void *) &optval, &optlen) == 0)
37725cdc 3274 invalidate = 1;
0d7a5398 3275#endif
d8723f43
NC
3276 /* Test for -1, as *BSD stdio (at least) on fclose sets the FILE* such
3277 that a subsequent fileno() on it returns -1. Don't want to croak()
3278 from within PerlIOUnix_refcnt_dec() if some buggy caller code is
3279 trying to close an already closed handle which somehow it still has
3280 a reference to. (via.xs, I'm looking at you). */
3281 if (fd != -1 && PerlIOUnix_refcnt_dec(fd) > 0) {
3282 /* File descriptor still in use */
0d7a5398 3283 invalidate = 1;
d8723f43 3284 }
0d7a5398 3285 if (invalidate) {
6b4ce6c8
AL
3286 /* For STD* handles, don't close stdio, since we shared the FILE *, too. */
3287 if (stdio == stdin) /* Some stdios are buggy fflush-ing inputs */
3288 return 0;
3289 if (stdio == stdout || stdio == stderr)
3290 return PerlIO_flush(f);
d88f7f65
JH
3291 }
3292#ifdef USE_ITHREADS
3293 MUTEX_LOCK(&PL_perlio_mutex);
3294 /* Right. We need a mutex here because for a brief while we
3295 will have the situation that fd is actually closed. Hence if
3296 a second thread were to get into this block, its dup() would
3297 likely return our fd as its dupfd. (after all, it is closed)
3298 Then if we get to the dup2() first, we blat the fd back
3299 (messing up its temporary as a side effect) only for it to
3300 then close its dupfd (== our fd) in its close(dupfd) */
3301
3302 /* There is, of course, a race condition, that any other thread
3303 trying to input/output/whatever on this fd will be stuffed
3304 for the duration of this little manoeuvrer. Perhaps we
3305 should hold an IO mutex for the duration of every IO
3306 operation if we know that invalidate doesn't work on this
3307 platform, but that would suck, and could kill performance.
3308
3309 Except that correctness trumps speed.
3310 Advice from klortho #11912. */
3311#endif
3312 if (invalidate) {
37725cdc
NIS
3313 /* Tricky - must fclose(stdio) to free memory but not close(fd)
3314 Use Sarathy's trick from maint-5.6 to invalidate the
3315 fileno slot of the FILE *
3316 */
bbfd922f 3317 result = PerlIO_flush(f);
4ee39169 3318 SAVE_ERRNO;
6b4ce6c8 3319 invalidate = PerlIOStdio_invalidate_fileno(aTHX_ stdio);
711e8db2 3320 if (!invalidate) {
6b4ce6c8 3321 dupfd = PerlLIO_dup(fd);
711e8db2 3322#ifdef USE_ITHREADS
9bab90c0 3323 if (dupfd < 0) {
711e8db2
NC
3324 /* Oh cXap. This isn't going to go well. Not sure if we can
3325 recover from here, or if closing this particular FILE *
3326 is a good idea now. */
3327 }
3328#endif
3329 }
94ccb807
JH
3330 } else {
3331 SAVE_ERRNO; /* This is here only to silence compiler warnings */
37725cdc 3332 }
0d7a5398 3333 result = PerlSIO_fclose(stdio);
37725cdc
NIS
3334 /* We treat error from stdio as success if we invalidated
3335 errno may NOT be expected EBADF
e8529473
NIS
3336 */
3337 if (invalidate && result != 0) {
4ee39169 3338 RESTORE_ERRNO;
0d7a5398 3339 result = 0;
37725cdc 3340 }
6b4ce6c8
AL
3341#ifdef SOCKS5_VERSION_NAME
3342 /* in SOCKS' case, let close() determine return value */
3343 result = close(fd);
3344#endif
1d791a44 3345 if (dupfd >= 0) {
0d7a5398 3346 PerlLIO_dup2(dupfd,fd);
9bab90c0 3347 PerlLIO_close(dupfd);
d88f7f65 3348 }
711e8db2 3349#ifdef USE_ITHREADS
d88f7f65 3350 MUTEX_UNLOCK(&PL_perlio_mutex);
711e8db2 3351#endif
9217ff3f 3352 return result;
37725cdc 3353 }
1751d015
NIS
3354}
3355
9e353e3b 3356SSize_t
f62ce20a 3357PerlIOStdio_read(pTHX_ PerlIO *f, void *vbuf, Size_t count)
9e353e3b 3358{
abf9167d 3359 FILE * s;
14a5cf38 3360 SSize_t got = 0;
abf9167d
DM
3361 if (PerlIO_lockcnt(f)) /* in use: abort ungracefully */
3362 return -1;
3363 s = PerlIOSelf(f, PerlIOStdio)->stdio;
4d948241
NIS
3364 for (;;) {
3365 if (count == 1) {
3366 STDCHAR *buf = (STDCHAR *) vbuf;
3367 /*
3368 * Perl is expecting PerlIO_getc() to fill the buffer Linux's
3369 * stdio does not do that for fread()
3370 */
de009b76 3371 const int ch = PerlSIO_fgetc(s);
4d948241
NIS
3372 if (ch != EOF) {
3373 *buf = ch;
3374 got = 1;
3375 }
14a5cf38 3376 }
4d948241
NIS
3377 else
3378 got = PerlSIO_fread(vbuf, 1, count, s);
b1d8b47a
CS
3379 if (got == 0 && PerlSIO_ferror(s))
3380 got = -1;
42a7a32f 3381 if (got >= 0 || errno != EINTR)
4d948241 3382 break;
abf9167d
DM
3383 if (PL_sig_pending && S_perlio_async_run(aTHX_ f))
3384 return -1;
42a7a32f 3385 SETERRNO(0,0); /* just in case */
14a5cf38 3386 }
bdae4172
JH
3387#ifdef __sgi
3388 /* Under some circumstances IRIX stdio fgetc() and fread()
3389 * set the errno to ENOENT, which makes no sense according
3390 * to either IRIX or POSIX. [rt.perl.org #123977] */
3391 if (errno == ENOENT) SETERRNO(0,0);
3392#endif
14a5cf38 3393 return got;
9e353e3b
NIS
3394}
3395
3396SSize_t
f62ce20a 3397PerlIOStdio_unread(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 3398{
14a5cf38 3399 SSize_t unread = 0;
c4420975 3400 FILE * const s = PerlIOSelf(f, PerlIOStdio)->stdio;
93679785 3401
313e59c8 3402#ifdef STDIO_BUFFER_WRITABLE
9f7cd136 3403 if (PerlIO_fast_gets(f) && PerlIO_has_base(f)) {
93679785
NIS
3404 STDCHAR *buf = ((STDCHAR *) vbuf) + count;
3405 STDCHAR *base = PerlIO_get_base(f);
3406 SSize_t cnt = PerlIO_get_cnt(f);
3407 STDCHAR *ptr = PerlIO_get_ptr(f);
3408 SSize_t avail = ptr - base;
3409 if (avail > 0) {
3410 if (avail > count) {
3411 avail = count;
3412 }
3413 ptr -= avail;
3414 Move(buf-avail,ptr,avail,STDCHAR);
3415 count -= avail;
3416 unread += avail;
3417 PerlIO_set_ptrcnt(f,ptr,cnt+avail);
9f7cd136
NIS
3418 if (PerlSIO_feof(s) && unread >= 0)
3419 PerlSIO_clearerr(s);
3420 }
3421 }
313e59c8
NIS
3422 else
3423#endif
3424 if (PerlIO_has_cntptr(f)) {
9f7cd136
NIS
3425 /* We can get pointer to buffer but not its base
3426 Do ungetc() but check chars are ending up in the
3427 buffer
3428 */
3429 STDCHAR *eptr = (STDCHAR*)PerlSIO_get_ptr(s);
3430 STDCHAR *buf = ((STDCHAR *) vbuf) + count;
3431 while (count > 0) {
de009b76 3432 const int ch = *--buf & 0xFF;
9f7cd136
NIS
3433 if (ungetc(ch,s) != ch) {
3434 /* ungetc did not work */
3435 break;
3436 }
3437 if ((STDCHAR*)PerlSIO_get_ptr(s) != --eptr || ((*eptr & 0xFF) != ch)) {
3438 /* Did not change pointer as expected */
375ed12a
JH
3439 if (fgetc(s) != EOF) /* get char back again */
3440 break;
9f7cd136
NIS
3441 }
3442 /* It worked ! */
3443 count--;
3444 unread++;
93679785
NIS
3445 }
3446 }
3447
3448 if (count > 0) {
3449 unread += PerlIOBase_unread(aTHX_ f, vbuf, count);
14a5cf38
JH
3450 }
3451 return unread;
9e353e3b
NIS
3452}
3453
3454SSize_t
f62ce20a 3455PerlIOStdio_write(pTHX_ PerlIO *f, const void *vbuf, Size_t count)
9e353e3b 3456{
4d948241 3457 SSize_t got;
abf9167d
DM
3458 if (PerlIO_lockcnt(f)) /* in use: abort ungracefully */
3459 return -1;
4d948241
NIS
3460 for (;;) {
3461 got = PerlSIO_fwrite(vbuf, 1, count,
3462 PerlIOSelf(f, PerlIOStdio)->stdio);
42a7a32f 3463 if (got >= 0 || errno != EINTR)
4d948241 3464 break;
abf9167d
DM
3465 if (PL_sig_pending && S_perlio_async_run(aTHX_ f))
3466 return -1;
42a7a32f 3467 SETERRNO(0,0); /* just in case */
4d948241
NIS
3468 }
3469 return got;
9e353e3b
NIS
3470}
3471
94a175e1 3472IV
f62ce20a 3473PerlIOStdio_seek(pTHX_ PerlIO *f, Off_t offset, int whence)
9e353e3b 3474{
c4420975 3475 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
96a5add6
AL
3476 PERL_UNUSED_CONTEXT;
3477
94a175e1 3478 return PerlSIO_fseek(stdio, offset, whence);
9e353e3b
NIS
3479}
3480
3481Off_t
f62ce20a 3482PerlIOStdio_tell(pTHX_ PerlIO *f)
9e353e3b 3483{
c4420975 3484 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
96a5add6
AL
3485 PERL_UNUSED_CONTEXT;
3486
94a175e1 3487 return PerlSIO_ftell(stdio);
9e353e3b
NIS
3488}
3489
3490IV
f62ce20a 3491PerlIOStdio_flush(pTHX_ PerlIO *f)
9e353e3b 3492{
c4420975 3493 FILE * const stdio = PerlIOSelf(f, PerlIOStdio)->stdio;
96a5add6
AL
3494 PERL_UNUSED_CONTEXT;
3495
14a5cf38
JH
3496 if (PerlIOBase(f)->flags & PERLIO_F_CANWRITE) {
3497 return PerlSIO_fflush(stdio);
3498 }
3499 else {
6f207bd3 3500 NOOP;
88b61e10 3501#if 0
14a5cf38
JH
3502 /*
3503 * FIXME: This discards ungetc() and pre-read stuff which is not
71200d45 3504 * right if this is just a "sync" from a layer above Suspect right
14a5cf38 3505 * design is to do _this_ but not have layer above flush this
71200d45 3506 * layer read-to-read
14a5cf38
JH
3507 */
3508 /*
71200d45 3509 * Not writeable - sync by attempting a seek
14a5cf38 3510 */
4ee39169 3511 dSAVE_ERRNO;
14a5cf38 3512 if (PerlSIO_fseek(stdio, (Off_t) 0, SEEK_CUR) != 0)
4ee39169 3513 RESTORE_ERRNO;
88b61e10 3514#endif
14a5cf38
JH
3515 }
3516 return 0;
9e353e3b
NIS
3517}
3518
3519IV
f62ce20a 3520PerlIOStdio_eof(pTHX_ PerlIO *f)
9e353e3b 3521{
96a5add6
AL
3522