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Fix pod warning for empty sections.
[perl5.git] / mg.c
CommitLineData
a0d0e21e 1/* mg.c
79072805 2 *
1129b882
NC		 3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
79072805
LW		 5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW		 9 */
10
11/*
4ac71550
TC		 12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
14 *
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
79072805
LW		 16 */
17
ccfc67b7
JH		 18/*
19=head1 Magical Functions
166f8a29
DM		 20
21"Magic" is special data attached to SV structures in order to give them
22"magical" properties. When any Perl code tries to read from, or assign to,
23an SV marked as magical, it calls the 'get' or 'set' function associated
24with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 25give it a chance to update its internal value (get on $. writes the line
166f8a29
DM		 26number of the last read filehandle into to the SV's IV slot), while
27set is called after an SV has been written to, in order to allow it to make
ddfa107c 28use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM		 29PL_rs global variable).
30
31Magic is implemented as a linked list of MAGIC structures attached to the
32SV. Each MAGIC struct holds the type of the magic, a pointer to an array
33of functions that implement the get(), set(), length() etc functions,
34plus space for some flags and pointers. For example, a tied variable has
35a MAGIC structure that contains a pointer to the object associated with the
36tie.
37
ccfc67b7
JH		 38*/
39
79072805 40#include "EXTERN.h"
864dbfa3 41#define PERL_IN_MG_C
79072805
LW		 42#include "perl.h"
43
5cd24f17 44#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH		 45# ifdef I_GRP
46# include <grp.h>
47# endif
188ea221
CS		 48#endif
49
757f63d8
SP		 50#if defined(HAS_SETGROUPS)
51# ifndef NGROUPS
52# define NGROUPS 32
53# endif
54#endif
55
17aa7f3d
JH		 56#ifdef __hpux
57# include <sys/pstat.h>
58#endif
59
7636ea95
AB		 60#ifdef HAS_PRCTL_SET_NAME
61# include <sys/prctl.h>
62#endif
63
8aad04aa 64#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 65Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 66#else
e69880a5 67Signal_t Perl_csighandler(int sig);
8aad04aa 68#endif
e69880a5 69
9cffb111
OS		 70#ifdef __Lynx__
71/* Missing protos on LynxOS */
72void setruid(uid_t id);
73void seteuid(uid_t id);
74void setrgid(uid_t id);
75void setegid(uid_t id);
76#endif
77
c07a80fd 78/*
79 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
80 */
81
82struct magic_state {
83 SV* mgs_sv;
455ece5e 84 I32 mgs_ss_ix;
f9c6fee5
CS		 85 U32 mgs_magical;
86 bool mgs_readonly;
c07a80fd 87};
455ece5e 88/* MGS is typedef'ed to struct magic_state in perl.h */
76e3520e
GS		 89
90STATIC void
8fb26106 91S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
c07a80fd 92{
97aff369 93 dVAR;
455ece5e 94 MGS* mgs;
7918f24d
NC		 95
96 PERL_ARGS_ASSERT_SAVE_MAGIC;
97
8985fe98
DM		 98 /* guard against sv having being freed midway by holding a private
99 reference. */
100 SvREFCNT_inc_simple_void_NN(sv);
101
c07a80fd 102 assert(SvMAGICAL(sv));
d8b2590f
NC		 103 /* Turning READONLY off for a copy-on-write scalar (including shared
104 hash keys) is a bad idea. */
765f542d 105 if (SvIsCOW(sv))
9a265e59 106 sv_force_normal_flags(sv, 0);
c07a80fd 107
8772537c 108 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD		 109
110 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 111 mgs->mgs_sv = sv;
f9c6fee5
CS		 112 mgs->mgs_magical = SvMAGICAL(sv);
113 mgs->mgs_readonly = SvREADONLY(sv) != 0;
455ece5e 114 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
c07a80fd 115
116 SvMAGICAL_off(sv);
117 SvREADONLY_off(sv);
085bde85
NC		 118 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
119 /* No public flags are set, so promote any private flags to public. */
120 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
121 }
c07a80fd 122}
123
954c1994
GS		 124/*
125=for apidoc mg_magical
126
127Turns on the magical status of an SV. See C<sv_magic>.
128
129=cut
130*/
131
8990e307 132void
864dbfa3 133Perl_mg_magical(pTHX_ SV *sv)
8990e307 134{
e1ec3a88 135 const MAGIC* mg;
7918f24d 136 PERL_ARGS_ASSERT_MG_MAGICAL;
96a5add6 137 PERL_UNUSED_CONTEXT;
f9c6fee5
CS		 138
139 SvMAGICAL_off(sv);
218787bd 140 if ((mg = SvMAGIC(sv))) {
218787bd
VP		 141 do {
142 const MGVTBL* const vtbl = mg->mg_virtual;
143 if (vtbl) {
144 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
145 SvGMAGICAL_on(sv);
146 if (vtbl->svt_set)
147 SvSMAGICAL_on(sv);
148 if (vtbl->svt_clear)
149 SvRMAGICAL_on(sv);
150 }
151 } while ((mg = mg->mg_moremagic));
152 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
153 SvRMAGICAL_on(sv);
8990e307
LW		 154 }
155}
156
2767dea0
DM		 157
158/* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
159
160STATIC bool
161S_is_container_magic(const MAGIC *mg)
162{
7918f24d 163 assert(mg);
2767dea0
DM		 164 switch (mg->mg_type) {
165 case PERL_MAGIC_bm:
166 case PERL_MAGIC_fm:
167 case PERL_MAGIC_regex_global:
168 case PERL_MAGIC_nkeys:
169#ifdef USE_LOCALE_COLLATE
170 case PERL_MAGIC_collxfrm:
171#endif
172 case PERL_MAGIC_qr:
173 case PERL_MAGIC_taint:
174 case PERL_MAGIC_vec:
175 case PERL_MAGIC_vstring:
176 case PERL_MAGIC_utf8:
177 case PERL_MAGIC_substr:
178 case PERL_MAGIC_defelem:
179 case PERL_MAGIC_arylen:
180 case PERL_MAGIC_pos:
181 case PERL_MAGIC_backref:
182 case PERL_MAGIC_arylen_p:
183 case PERL_MAGIC_rhash:
184 case PERL_MAGIC_symtab:
5afa72af 185 case PERL_MAGIC_tied: /* treat as value, so 'local @tied' isn't tied */
d9088386 186 case PERL_MAGIC_checkcall:
2767dea0
DM		 187 return 0;
188 default:
189 return 1;
190 }
191}
192
954c1994
GS		 193/*
194=for apidoc mg_get
195
196Do magic after a value is retrieved from the SV. See C<sv_magic>.
197
198=cut
199*/
200
79072805 201int
864dbfa3 202Perl_mg_get(pTHX_ SV *sv)
79072805 203{
97aff369 204 dVAR;
35a4481c 205 const I32 mgs_ix = SSNEW(sizeof(MGS));
f9c6fee5 206 bool have_new = 0;
ff76feab 207 MAGIC *newmg, *head, *cur, *mg;
6683b158 208
7918f24d
NC		 209 PERL_ARGS_ASSERT_MG_GET;
210
455ece5e 211 save_magic(mgs_ix, sv);
463ee0b2 212
ff76feab
AMS		 213 /* We must call svt_get(sv, mg) for each valid entry in the linked
214 list of magic. svt_get() may delete the current entry, add new
215 magic to the head of the list, or upgrade the SV. AMS 20010810 */
216
217 newmg = cur = head = mg = SvMAGIC(sv);
218 while (mg) {
35a4481c 219 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 220 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 221
2b260de0 222 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
16c91539 223 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 224
58f82c5c
DM		 225 /* guard against magic having been deleted - eg FETCH calling
226 * untie */
f9c6fee5
CS		 227 if (!SvMAGIC(sv)) {
228 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
58f82c5c 229 break;
f9c6fee5 230 }
b77f7d40 231
f9c6fee5 232 /* recalculate flags if this entry was deleted. */
ff76feab 233 if (mg->mg_flags & MGf_GSKIP)
f9c6fee5 234 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
a0d0e21e 235 }
ff76feab 236
f9c6fee5 237 mg = nextmg;
ff76feab 238
0723351e 239 if (have_new) {
ff76feab
AMS		 240 /* Have we finished with the new entries we saw? Start again
241 where we left off (unless there are more new entries). */
242 if (mg == head) {
0723351e 243 have_new = 0;
ff76feab
AMS		 244 mg = cur;
245 head = newmg;
246 }
247 }
248
249 /* Were any new entries added? */
0723351e
NC		 250 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
251 have_new = 1;
ff76feab
AMS		 252 cur = mg;
253 mg = newmg;
f9c6fee5 254 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
760ac839 255 }
79072805 256 }
463ee0b2 257
8772537c 258 restore_magic(INT2PTR(void *, (IV)mgs_ix));
79072805
LW		 259 return 0;
260}
261
954c1994
GS		 262/*
263=for apidoc mg_set
264
265Do magic after a value is assigned to the SV. See C<sv_magic>.
266
267=cut
268*/
269
79072805 270int
864dbfa3 271Perl_mg_set(pTHX_ SV *sv)
79072805 272{
97aff369 273 dVAR;
35a4481c 274 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 275 MAGIC* mg;
463ee0b2
LW		 276 MAGIC* nextmg;
277
7918f24d
NC		 278 PERL_ARGS_ASSERT_MG_SET;
279
455ece5e 280 save_magic(mgs_ix, sv);
463ee0b2
LW		 281
282 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 283 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 284 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW		 285 if (mg->mg_flags & MGf_GSKIP) {
286 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
f9c6fee5 287 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
a0d0e21e 288 }
e7cbf6c6
DM		 289 if (PL_localizing == 2 && !S_is_container_magic(mg))
290 continue;
2b260de0 291 if (vtbl && vtbl->svt_set)
16c91539 292 vtbl->svt_set(aTHX_ sv, mg);
79072805 293 }
463ee0b2 294
8772537c 295 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW		 296 return 0;
297}
298
954c1994
GS		 299/*
300=for apidoc mg_length
301
302Report on the SV's length. See C<sv_magic>.
303
304=cut
305*/
306
79072805 307U32
864dbfa3 308Perl_mg_length(pTHX_ SV *sv)
79072805 309{
97aff369 310 dVAR;
79072805 311 MAGIC* mg;
463ee0b2 312 STRLEN len;
463ee0b2 313
7918f24d
NC		 314 PERL_ARGS_ASSERT_MG_LENGTH;
315
79072805 316 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 317 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 318 if (vtbl && vtbl->svt_len) {
35a4481c 319 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 320 save_magic(mgs_ix, sv);
a0d0e21e 321 /* omit MGf_GSKIP -- not changed here */
16c91539 322 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 323 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW		 324 return len;
325 }
326 }
327
d0644529
NC		 328 {
329 /* You can't know whether it's UTF-8 until you get the string again...
330 */
10516c54 331 const U8 *s = (U8*)SvPV_const(sv, len);
d0644529
NC		 332
333 if (DO_UTF8(sv)) {
334 len = utf8_length(s, s + len);
335 }
5636d518 336 }
463ee0b2 337 return len;
79072805
LW		 338}
339
8fb26106 340I32
864dbfa3 341Perl_mg_size(pTHX_ SV *sv)
93965878
NIS		 342{
343 MAGIC* mg;
ac27b0f5 344
7918f24d
NC		 345 PERL_ARGS_ASSERT_MG_SIZE;
346
93965878 347 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 348 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 349 if (vtbl && vtbl->svt_len) {
35a4481c
AL		 350 const I32 mgs_ix = SSNEW(sizeof(MGS));
351 I32 len;
455ece5e 352 save_magic(mgs_ix, sv);
93965878 353 /* omit MGf_GSKIP -- not changed here */
16c91539 354 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 355 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS		 356 return len;
357 }
358 }
359
360 switch(SvTYPE(sv)) {
361 case SVt_PVAV:
502c6561 362 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS		 363 case SVt_PVHV:
364 /* FIXME */
365 default:
cea2e8a9 366 Perl_croak(aTHX_ "Size magic not implemented");
93965878
NIS		 367 break;
368 }
369 return 0;
370}
371
954c1994
GS		 372/*
373=for apidoc mg_clear
374
375Clear something magical that the SV represents. See C<sv_magic>.
376
377=cut
378*/
379
79072805 380int
864dbfa3 381Perl_mg_clear(pTHX_ SV *sv)
79072805 382{
35a4481c 383 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 384 MAGIC* mg;
8ac77ac9 385 MAGIC *nextmg;
463ee0b2 386
7918f24d
NC		 387 PERL_ARGS_ASSERT_MG_CLEAR;
388
455ece5e 389 save_magic(mgs_ix, sv);
463ee0b2 390
8ac77ac9 391 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 392 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 393 /* omit GSKIP -- never set here */
727405f8 394
8ac77ac9
NC		 395 nextmg = mg->mg_moremagic; /* it may delete itself */
396
2b260de0 397 if (vtbl && vtbl->svt_clear)
16c91539 398 vtbl->svt_clear(aTHX_ sv, mg);
79072805 399 }
463ee0b2 400
8772537c 401 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW		 402 return 0;
403}
404
39de7f53
FR		 405MAGIC*
406S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
407{
408 PERL_UNUSED_CONTEXT;
409
410 assert(flags <= 1);
411
412 if (sv) {
413 MAGIC *mg;
414
415 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
416 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
417 return mg;
418 }
419 }
420 }
421
422 return NULL;
423}
424
954c1994
GS		 425/*
426=for apidoc mg_find
427
428Finds the magic pointer for type matching the SV. See C<sv_magic>.
429
430=cut
431*/
432
93a17b20 433MAGIC*
35a4481c 434Perl_mg_find(pTHX_ const SV *sv, int type)
93a17b20 435{
39de7f53
FR		 436 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
437}
438
439/*
440=for apidoc mg_findext
441
442Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
443C<sv_magicext>.
444
445=cut
446*/
447
448MAGIC*
449Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
450{
451 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
93a17b20
LW		 452}
453
954c1994
GS		 454/*
455=for apidoc mg_copy
456
457Copies the magic from one SV to another. See C<sv_magic>.
458
459=cut
460*/
461
79072805 462int
864dbfa3 463Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 464{
463ee0b2 465 int count = 0;
79072805 466 MAGIC* mg;
7918f24d
NC		 467
468 PERL_ARGS_ASSERT_MG_COPY;
469
463ee0b2 470 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 471 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 472 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 473 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 474 }
823a54a3
AL		 475 else {
476 const char type = mg->mg_type;
1e73acc8 477 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL		 478 sv_magic(nsv,
479 (type == PERL_MAGIC_tied)
480 ? SvTIED_obj(sv, mg)
481 : (type == PERL_MAGIC_regdata && mg->mg_obj)
482 ? sv
483 : mg->mg_obj,
484 toLOWER(type), key, klen);
485 count++;
486 }
79072805 487 }
79072805 488 }
463ee0b2 489 return count;
79072805
LW		 490}
491
954c1994 492/*
0cbee0a4
DM		 493=for apidoc mg_localize
494
9711599e
CS		 495Copy some of the magic from an existing SV to new localized version of that
496SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
497taint, pos).
498
af7df257 499If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS		 500This typically means that assignment will soon follow (e.g. 'local $x = $y'),
501and that will handle the magic.
0cbee0a4
DM		 502
503=cut
504*/
505
506void
af7df257 507Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4 508{
97aff369 509 dVAR;
0cbee0a4 510 MAGIC *mg;
7918f24d
NC		 511
512 PERL_ARGS_ASSERT_MG_LOCALIZE;
513
0cbee0a4 514 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 515 const MGVTBL* const vtbl = mg->mg_virtual;
2767dea0 516 if (!S_is_container_magic(mg))
0cbee0a4 517 continue;
0cbee0a4 518
a5063e7c 519 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 520 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 521 else
0cbee0a4
DM		 522 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
523 mg->mg_ptr, mg->mg_len);
a5063e7c 524
0cbee0a4
DM		 525 /* container types should remain read-only across localization */
526 SvFLAGS(nsv) |= SvREADONLY(sv);
527 }
528
529 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
530 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 531 if (setmagic) {
9711599e
CS		 532 PL_localizing = 1;
533 SvSETMAGIC(nsv);
534 PL_localizing = 0;
535 }
0cbee0a4
DM		 536 }
537}
538
d9088386
Z		 539#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
540static void
541S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
542{
543 const MGVTBL* const vtbl = mg->mg_virtual;
544 if (vtbl && vtbl->svt_free)
545 vtbl->svt_free(aTHX_ sv, mg);
546 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
547 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
548 Safefree(mg->mg_ptr);
549 else if (mg->mg_len == HEf_SVKEY)
550 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
551 }
552 if (mg->mg_flags & MGf_REFCOUNTED)
553 SvREFCNT_dec(mg->mg_obj);
554 Safefree(mg);
555}
556
0cbee0a4 557/*
954c1994
GS		 558=for apidoc mg_free
559
560Free any magic storage used by the SV. See C<sv_magic>.
561
562=cut
563*/
564
79072805 565int
864dbfa3 566Perl_mg_free(pTHX_ SV *sv)
79072805
LW		 567{
568 MAGIC* mg;
569 MAGIC* moremagic;
7918f24d
NC		 570
571 PERL_ARGS_ASSERT_MG_FREE;
572
79072805 573 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 574 moremagic = mg->mg_moremagic;
d9088386 575 mg_free_struct(sv, mg);
c826f41b 576 SvMAGIC_set(sv, moremagic);
79072805 577 }
b162af07 578 SvMAGIC_set(sv, NULL);
68f8932e 579 SvMAGICAL_off(sv);
79072805
LW		 580 return 0;
581}
582
d9088386
Z		 583/*
584=for apidoc Am|void|mg_free_type|SV *sv|int how
585
586Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
587
588=cut
589*/
590
591void
592Perl_mg_free_type(pTHX_ SV *sv, int how)
593{
594 MAGIC *mg, *prevmg, *moremg;
595 PERL_ARGS_ASSERT_MG_FREE_TYPE;
596 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
597 MAGIC *newhead;
598 moremg = mg->mg_moremagic;
599 if (mg->mg_type == how) {
600 /* temporarily move to the head of the magic chain, in case
601 custom free code relies on this historical aspect of mg_free */
602 if (prevmg) {
603 prevmg->mg_moremagic = moremg;
604 mg->mg_moremagic = SvMAGIC(sv);
605 SvMAGIC_set(sv, mg);
606 }
607 newhead = mg->mg_moremagic;
608 mg_free_struct(sv, mg);
609 SvMAGIC_set(sv, newhead);
610 mg = prevmg;
611 }
612 }
613 mg_magical(sv);
614}
615
79072805 616#include <signal.h>
79072805 617
942e002e 618U32
864dbfa3 619Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 620{
97aff369 621 dVAR;
8772537c 622 PERL_UNUSED_ARG(sv);
6cef1e77 623
7918f24d
NC		 624 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
625
0bd48802
AL		 626 if (PL_curpm) {
627 register const REGEXP * const rx = PM_GETRE(PL_curpm);
628 if (rx) {
a678b0e4
YO		 629 if (mg->mg_obj) { /* @+ */
630 /* return the number possible */
07bc277f 631 return RX_NPARENS(rx);
a678b0e4 632 } else { /* @- */
07bc277f 633 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO		 634
635 /* return the last filled */
f46c4081 636 while ( paren >= 0
07bc277f
NC		 637 && (RX_OFFS(rx)[paren].start == -1
638 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 639 paren--;
a678b0e4
YO		 640 return (U32)paren;
641 }
0bd48802 642 }
8f580fb8 643 }
ac27b0f5 644
942e002e 645 return (U32)-1;
6cef1e77
IZ		 646}
647
648int
864dbfa3 649Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 650{
97aff369 651 dVAR;
7918f24d
NC		 652
653 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
654
0bd48802
AL		 655 if (PL_curpm) {
656 register const REGEXP * const rx = PM_GETRE(PL_curpm);
657 if (rx) {
658 register const I32 paren = mg->mg_len;
659 register I32 s;
660 register I32 t;
661 if (paren < 0)
662 return 0;
07bc277f
NC		 663 if (paren <= (I32)RX_NPARENS(rx) &&
664 (s = RX_OFFS(rx)[paren].start) != -1 &&
665 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802
AL		 666 {
667 register I32 i;
668 if (mg->mg_obj) /* @+ */
669 i = t;
670 else /* @- */
671 i = s;
672
673 if (i > 0 && RX_MATCH_UTF8(rx)) {
07bc277f 674 const char * const b = RX_SUBBEG(rx);
0bd48802 675 if (b)
f5a63d97 676 i = utf8_length((U8*)b, (U8*)(b+i));
0bd48802 677 }
727405f8 678
0bd48802 679 sv_setiv(sv, i);
1aa99e6b 680 }
0bd48802 681 }
6cef1e77
IZ		 682 }
683 return 0;
684}
685
e4b89193 686int
a29d06ed
MG		 687Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
688{
7918f24d 689 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
d4c19fe8
AL		 690 PERL_UNUSED_ARG(sv);
691 PERL_UNUSED_ARG(mg);
6ad8f254 692 Perl_croak_no_modify(aTHX);
0dbb1585 693 NORETURN_FUNCTION_END;
a29d06ed
MG		 694}
695
93a17b20 696U32
864dbfa3 697Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
93a17b20 698{
97aff369 699 dVAR;
93a17b20 700 register I32 paren;
93a17b20 701 register I32 i;
2fdbfb4d
AB		 702 register const REGEXP * rx;
703 const char * const remaining = mg->mg_ptr + 1;
93a17b20 704
7918f24d
NC		 705 PERL_ARGS_ASSERT_MAGIC_LEN;
706
93a17b20 707 switch (*mg->mg_ptr) {
2fdbfb4d
AB		 708 case '\020':
709 if (*remaining == '\0') { /* ^P */
710 break;
711 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
712 goto do_prematch;
713 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
714 goto do_postmatch;
715 }
716 break;
717 case '\015': /* $^MATCH */
718 if (strEQ(remaining, "ATCH")) {
719 goto do_match;
720 } else {
721 break;
722 }
723 case '`':
724 do_prematch:
f1b875a0 725 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB		 726 goto maybegetparen;
727 case '\'':
728 do_postmatch:
f1b875a0 729 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB		 730 goto maybegetparen;
731 case '&':
732 do_match:
f1b875a0 733 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d 734 goto maybegetparen;
93a17b20 735 case '1': case '2': case '3': case '4':
2fdbfb4d
AB		 736 case '5': case '6': case '7': case '8': case '9':
737 paren = atoi(mg->mg_ptr);
738 maybegetparen:
aaa362c4 739 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d
AB		 740 getparen:
741 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
cf93c79d 742
ffc61ed2 743 if (i < 0)
0844c848 744 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
ffc61ed2 745 return i;
2fdbfb4d 746 } else {
235bddc8 747 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 748 report_uninit(sv);
2fdbfb4d 749 return 0;
93a17b20 750 }
93a17b20 751 case '+':
aaa362c4 752 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f 753 paren = RX_LASTPAREN(rx);
13f57bf8
CS		 754 if (paren)
755 goto getparen;
93a17b20 756 }
748a9306 757 return 0;
a01268b5
JH		 758 case '\016': /* ^N */
759 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f 760 paren = RX_LASTCLOSEPAREN(rx);
a01268b5
JH		 761 if (paren)
762 goto getparen;
763 }
764 return 0;
93a17b20
LW		 765 }
766 magic_get(sv,mg);
2d8e6c8d 767 if (!SvPOK(sv) && SvNIOK(sv)) {
8b6b16e7 768 sv_2pv(sv, 0);
2d8e6c8d 769 }
93a17b20
LW		 770 if (SvPOK(sv))
771 return SvCUR(sv);
772 return 0;
773}
774
ad3296c6 775#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA		 776 if (SvPOK(sv)) { \
777 STRLEN len = SvCUR(sv); \
778 char * const p = SvPVX(sv); \
8e6b4db6
PC		 779 while (len > 0 && isSPACE(p[len-1])) \
780 --len; \
781 SvCUR_set(sv, len); \
782 p[len] = '\0'; \
783 } \
ad3296c6
SH		 784} STMT_END
785
8b850bd5
NC		 786void
787Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
788{
7918f24d
NC		 789 PERL_ARGS_ASSERT_EMULATE_COP_IO;
790
8b850bd5
NC		 791 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
792 sv_setsv(sv, &PL_sv_undef);
793 else {
794 sv_setpvs(sv, "");
795 SvUTF8_off(sv);
796 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 797 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC		 798 assert(value);
799 sv_catsv(sv, value);
800 }
801 sv_catpvs(sv, "\0");
802 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 803 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC		 804 assert(value);
805 sv_catsv(sv, value);
806 }
807 }
808}
809
79072805 810int
864dbfa3 811Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 812{
27da23d5 813 dVAR;
79072805 814 register I32 paren;
db7198b5 815 register const char *s = NULL;
d9f97599 816 register REGEXP *rx;
823a54a3
AL		 817 const char * const remaining = mg->mg_ptr + 1;
818 const char nextchar = *remaining;
79072805 819
7918f24d
NC		 820 PERL_ARGS_ASSERT_MAGIC_GET;
821
79072805 822 switch (*mg->mg_ptr) {
748a9306 823 case '\001': /* ^A */
3280af22 824 sv_setsv(sv, PL_bodytarget);
125b9982
NT		 825 if (SvTAINTED(PL_bodytarget))
826 SvTAINTED_on(sv);
748a9306 827 break;
e5218da5 828 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 829 if (nextchar == '\0') {
e5218da5
GA		 830 sv_setiv(sv, (IV)PL_minus_c);
831 }
823a54a3 832 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA		 833 sv_setiv(sv, (IV)STATUS_NATIVE);
834 }
49460fe6
NIS		 835 break;
836
79072805 837 case '\004': /* ^D */
aea4f609 838 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 839 break;
28f23441 840 case '\005': /* ^E */
823a54a3 841 if (nextchar == '\0') {
e37778c2 842#if defined(VMS)
0a378802
JH		 843 {
844# include <descrip.h>
845# include <starlet.h>
846 char msg[255];
847 $DESCRIPTOR(msgdsc,msg);
848 sv_setnv(sv,(NV) vaxc$errno);
849 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
850 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
851 else
76f68e9b 852 sv_setpvs(sv,"");
0a378802 853 }
4b645107 854#elif defined(OS2)
0a378802
JH		 855 if (!(_emx_env & 0x200)) { /* Under DOS */
856 sv_setnv(sv, (NV)errno);
857 sv_setpv(sv, errno ? Strerror(errno) : "");
858 } else {
859 if (errno != errno_isOS2) {
823a54a3 860 const int tmp = _syserrno();
0a378802
JH		 861 if (tmp) /* 2nd call to _syserrno() makes it 0 */
862 Perl_rc = tmp;
863 }
864 sv_setnv(sv, (NV)Perl_rc);
865 sv_setpv(sv, os2error(Perl_rc));
866 }
4b645107 867#elif defined(WIN32)
0a378802 868 {
d4c19fe8 869 const DWORD dwErr = GetLastError();
0a378802 870 sv_setnv(sv, (NV)dwErr);
823a54a3 871 if (dwErr) {
0a378802
JH		 872 PerlProc_GetOSError(sv, dwErr);
873 }
874 else
76f68e9b 875 sv_setpvs(sv, "");
0a378802
JH		 876 SetLastError(dwErr);
877 }
22fae026 878#else
f6c8f21d 879 {
4ee39169 880 dSAVE_ERRNO;
f6c8f21d 881 sv_setnv(sv, (NV)errno);
666ea192 882 sv_setpv(sv, errno ? Strerror(errno) : "");
4ee39169 883 RESTORE_ERRNO;
f6c8f21d 884 }
28f23441 885#endif
ad3296c6 886 SvRTRIM(sv);
0a378802
JH		 887 SvNOK_on(sv); /* what a wonderful hack! */
888 }
823a54a3 889 else if (strEQ(remaining, "NCODING"))
0a378802
JH		 890 sv_setsv(sv, PL_encoding);
891 break;
79072805 892 case '\006': /* ^F */
3280af22 893 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 894 break;
9ebf26ad
FR		 895 case '\007': /* ^GLOBAL_PHASE */
896 if (strEQ(remaining, "LOBAL_PHASE")) {
897 sv_setpvn(sv, PL_phase_names[PL_phase],
898 strlen(PL_phase_names[PL_phase]));
899 }
900 break;
a0d0e21e 901 case '\010': /* ^H */
3280af22 902 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 903 break;
9d116dd7 904 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 905 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 906 break;
ac27b0f5 907 case '\017': /* ^O & ^OPEN */
823a54a3 908 if (nextchar == '\0') {
ac27b0f5 909 sv_setpv(sv, PL_osname);
3511154c
DM		 910 SvTAINTED_off(sv);
911 }
823a54a3 912 else if (strEQ(remaining, "PEN")) {
8b850bd5 913 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 914 }
28f23441 915 break;
9ebf26ad 916 case '\020':
cde0cee5
YO		 917 if (nextchar == '\0') { /* ^P */
918 sv_setiv(sv, (IV)PL_perldb);
919 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
920 goto do_prematch_fetch;
921 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
922 goto do_postmatch_fetch;
923 }
79072805 924 break;
fb73857a 925 case '\023': /* ^S */
823a54a3 926 if (nextchar == '\0') {
bc177e6b 927 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 928 SvOK_off(sv);
3280af22 929 else if (PL_in_eval)
6dc8a9e4 930 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS		 931 else
932 sv_setiv(sv, 0);
d58bf5aa 933 }
fb73857a 934 break;
79072805 935 case '\024': /* ^T */
823a54a3 936 if (nextchar == '\0') {
88e89b8a 937#ifdef BIG_TIME
7c36658b 938 sv_setnv(sv, PL_basetime);
88e89b8a 939#else
7c36658b 940 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 941#endif
7c36658b 942 }
823a54a3 943 else if (strEQ(remaining, "AINT"))
9aa05f58
RGS		 944 sv_setiv(sv, PL_tainting
945 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
946 : 0);
7c36658b 947 break;
e07ea26a 948 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 949 if (strEQ(remaining, "NICODE"))
a05d7ebb 950 sv_setuv(sv, (UV) PL_unicode);
823a54a3 951 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 952 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC		 953 else if (strEQ(remaining, "TF8CACHE"))
954 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH		 955 break;
956 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 957 if (nextchar == '\0')
4438c4b7 958 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 959 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 960 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 961 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS		 962 }
963 else if (PL_compiling.cop_warnings == pWARN_STD) {
666ea192
JH		 964 sv_setpvn(
965 sv,
966 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
967 WARNsize
968 );
013b78e8 969 }
d3a7d8c7 970 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS		 971 /* Get the bit mask for $warnings::Bits{all}, because
972 * it could have been extended by warnings::register */
6673a63c 973 HV * const bits=get_hv("warnings::Bits", 0);
f5a63d97
AL		 974 if (bits) {
975 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
976 if (bits_all)
977 sv_setsv(sv, *bits_all);
75b6c4ca
RGS		 978 }
979 else {
980 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
981 }
ac27b0f5 982 }
4438c4b7 983 else {
72dc9ed5
NC		 984 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
985 *PL_compiling.cop_warnings);
ac27b0f5 986 }
d3a7d8c7 987 SvPOK_only(sv);
4438c4b7 988 }
79072805 989 break;
cde0cee5
YO		 990 case '\015': /* $^MATCH */
991 if (strEQ(remaining, "ATCH")) {
79072805
LW		 992 case '1': case '2': case '3': case '4':
993 case '5': case '6': case '7': case '8': case '9': case '&':
cde0cee5
YO		 994 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
995 /*
159b6efe 996 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
cde0cee5
YO		 997 * XXX Does the new way break anything?
998 */
999 paren = atoi(mg->mg_ptr); /* $& is in [0] */
2fdbfb4d 1000 CALLREG_NUMBUF_FETCH(rx,paren,sv);
cde0cee5
YO		 1001 break;
1002 }
1003 sv_setsv(sv,&PL_sv_undef);
79072805
LW		 1004 }
1005 break;
1006 case '+':
aaa362c4 1007 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f
NC		 1008 if (RX_LASTPAREN(rx)) {
1009 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
44a2ac75
YO		 1010 break;
1011 }
79072805 1012 }
3280af22 1013 sv_setsv(sv,&PL_sv_undef);
79072805 1014 break;
a01268b5
JH		 1015 case '\016': /* ^N */
1016 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f
NC		 1017 if (RX_LASTCLOSEPAREN(rx)) {
1018 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
44a2ac75
YO		 1019 break;
1020 }
1021
a01268b5
JH		 1022 }
1023 sv_setsv(sv,&PL_sv_undef);
1024 break;
79072805 1025 case '`':
cde0cee5 1026 do_prematch_fetch:
aaa362c4 1027 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d 1028 CALLREG_NUMBUF_FETCH(rx,-2,sv);
93b32b6d 1029 break;
79072805 1030 }
3280af22 1031 sv_setsv(sv,&PL_sv_undef);
79072805
LW		 1032 break;
1033 case '\'':
cde0cee5 1034 do_postmatch_fetch:
aaa362c4 1035 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d 1036 CALLREG_NUMBUF_FETCH(rx,-1,sv);
93b32b6d 1037 break;
79072805 1038 }
3280af22 1039 sv_setsv(sv,&PL_sv_undef);
79072805
LW		 1040 break;
1041 case '.':
3280af22 1042 if (GvIO(PL_last_in_gv)) {
357c8808 1043 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1044 }
79072805
LW		 1045 break;
1046 case '?':
809a5acc 1047 {
809a5acc 1048 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1049#ifdef COMPLEX_STATUS
41cb7b2b 1050 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS		 1051 LvTARGOFF(sv) = PL_statusvalue;
1052 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1053#endif
809a5acc 1054 }
79072805
LW		 1055 break;
1056 case '^':
099be4f1
DM		 1057 if (!isGV_with_GP(PL_defoutgv))
1058 s = "";
1059 else if (GvIOp(PL_defoutgv))
1060 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW		 1061 if (s)
1062 sv_setpv(sv,s);
1063 else {
3280af22 1064 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1065 sv_catpvs(sv,"_TOP");
79072805
LW		 1066 }
1067 break;
1068 case '~':
099be4f1
DM		 1069 if (!isGV_with_GP(PL_defoutgv))
1070 s = "";
1071 else if (GvIOp(PL_defoutgv))
0daa599b 1072 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1073 if (!s)
3280af22 1074 s = GvENAME(PL_defoutgv);
79072805
LW		 1075 sv_setpv(sv,s);
1076 break;
79072805 1077 case '=':
099be4f1 1078 if (GvIO(PL_defoutgv))
0daa599b 1079 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW		 1080 break;
1081 case '-':
099be4f1 1082 if (GvIO(PL_defoutgv))
0daa599b 1083 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW		 1084 break;
1085 case '%':
099be4f1 1086 if (GvIO(PL_defoutgv))
0daa599b 1087 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1088 break;
79072805
LW		 1089 case ':':
1090 break;
1091 case '/':
1092 break;
1093 case '[':
11206fdd 1094 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
79072805
LW		 1095 break;
1096 case '|':
099be4f1 1097 if (GvIO(PL_defoutgv))
0daa599b 1098 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1099 break;
79072805 1100 case '\\':
b2ce0fda 1101 if (PL_ors_sv)
f28098ff 1102 sv_copypv(sv, PL_ors_sv);
79072805 1103 break;
79072805 1104 case '!':
666d8aa2
CB		 1105 {
1106 dSAVE_ERRNO;
a5f75d66 1107#ifdef VMS
65202027 1108 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
a5f75d66 1109#else
65202027 1110 sv_setnv(sv, (NV)errno);
666d8aa2 1111#endif
88e89b8a 1112#ifdef OS2
ed344e4f
IZ		 1113 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1114 sv_setpv(sv, os2error(Perl_rc));
88e89b8a 1115 else
a5f75d66 1116#endif
666ea192 1117 sv_setpv(sv, errno ? Strerror(errno) : "");
be1cf43c
NC		 1118 if (SvPOKp(sv))
1119 SvPOK_on(sv); /* may have got removed during taint processing */
4ee39169 1120 RESTORE_ERRNO;
88e89b8a 1121 }
666d8aa2 1122
ad3296c6 1123 SvRTRIM(sv);
946ec16e 1124 SvNOK_on(sv); /* what a wonderful hack! */
79072805
LW		 1125 break;
1126 case '<':
3280af22 1127 sv_setiv(sv, (IV)PL_uid);
79072805
LW		 1128 break;
1129 case '>':
3280af22 1130 sv_setiv(sv, (IV)PL_euid);
79072805
LW		 1131 break;
1132 case '(':
3280af22 1133 sv_setiv(sv, (IV)PL_gid);
79072805
LW		 1134 goto add_groups;
1135 case ')':
3280af22 1136 sv_setiv(sv, (IV)PL_egid);
79072805 1137 add_groups:
79072805 1138#ifdef HAS_GETGROUPS
79072805 1139 {
57d7c65e 1140 Groups_t *gary = NULL;
fb45abb2 1141 I32 i, num_groups = getgroups(0, gary);
57d7c65e
JC		 1142 Newx(gary, num_groups, Groups_t);
1143 num_groups = getgroups(num_groups, gary);
fb45abb2
GA		 1144 for (i = 0; i < num_groups; i++)
1145 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
57d7c65e 1146 Safefree(gary);
79072805 1147 }
155aba94 1148 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1149#endif
79072805 1150 break;
79072805
LW		 1151 case '0':
1152 break;
1153 }
a0d0e21e 1154 return 0;
79072805
LW		 1155}
1156
1157int
864dbfa3 1158Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1159{
8772537c 1160 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1161
7918f24d
NC		 1162 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1163
79072805 1164 if (uf && uf->uf_val)
24f81a43 1165 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW		 1166 return 0;
1167}
1168
1169int
864dbfa3 1170Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1171{
27da23d5 1172 dVAR;
9ae3433d 1173 STRLEN len = 0, klen;
666ea192 1174 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
fabdb6c0 1175 const char * const ptr = MgPV_const(mg,klen);
88e89b8a 1176 my_setenv(ptr, s);
1e422769 1177
7918f24d
NC		 1178 PERL_ARGS_ASSERT_MAGIC_SETENV;
1179
a0d0e21e
LW		 1180#ifdef DYNAMIC_ENV_FETCH
1181 /* We just undefd an environment var. Is a replacement */
1182 /* waiting in the wings? */
1183 if (!len) {
fabdb6c0
AL		 1184 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1185 if (valp)
4ab59fcc 1186 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW		 1187 }
1188#endif
1e422769 1189
39e571d4 1190#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW		 1191 /* And you'll never guess what the dog had */
1192 /* in its mouth... */
3280af22 1193 if (PL_tainting) {
1e422769 1194 MgTAINTEDDIR_off(mg);
1195#ifdef VMS
5aabfad6 1196 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
b8ffc8df 1197 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769 1198 int i = 0, j = 0;
1199
6fca0082 1200 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1201 elt = eltbuf;
1e422769 1202 do { /* DCL$PATH may be a search list */
1203 while (1) { /* as may dev portion of any element */
1204 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1205 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1206 cando_by_name(S_IWUSR,0,elt) ) {
1207 MgTAINTEDDIR_on(mg);
1208 return 0;
1209 }
1210 }
bd61b366 1211 if ((cp = strchr(elt, ':')) != NULL)
1e422769 1212 *cp = '\0';
1213 if (my_trnlnm(elt, eltbuf, j++))
1214 elt = eltbuf;
1215 else
1216 break;
1217 }
1218 j = 0;
1219 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1220 }
1221#endif /* VMS */
5aabfad6 1222 if (s && klen == 4 && strEQ(ptr,"PATH")) {
8772537c 1223 const char * const strend = s + len;
463ee0b2
LW		 1224
1225 while (s < strend) {
96827780 1226 char tmpbuf[256];
c623ac67 1227 Stat_t st;
5f74f29c 1228 I32 i;
f5a63d97
AL		 1229#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1230 const char path_sep = '|';
1231#else
1232 const char path_sep = ':';
1233#endif
96827780 1234 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1235 s, strend, path_sep, &i);
463ee0b2 1236 s++;
bb7a0f54 1237 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB		 1238#ifdef VMS
1239 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1240#else
1241 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1242#endif
c6ed36e1 1243 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1244 MgTAINTEDDIR_on(mg);
1e422769 1245 return 0;
1246 }
463ee0b2 1247 }
79072805
LW		 1248 }
1249 }
39e571d4 1250#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1251
79072805
LW		 1252 return 0;
1253}
1254
1255int
864dbfa3 1256Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1257{
7918f24d 1258 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1259 PERL_UNUSED_ARG(sv);
bd61b366 1260 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW		 1261 return 0;
1262}
1263
88e89b8a 1264int
864dbfa3 1265Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1266{
97aff369 1267 dVAR;
7918f24d 1268 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1269 PERL_UNUSED_ARG(mg);
b0269e46 1270#if defined(VMS)
cea2e8a9 1271 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1272#else
3280af22 1273 if (PL_localizing) {
fb73857a 1274 HE* entry;
b0269e46 1275 my_clearenv();
85fbaab2
NC		 1276 hv_iterinit(MUTABLE_HV(sv));
1277 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a 1278 I32 keylen;
1279 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1280 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a 1281 }
1282 }
1283#endif
1284 return 0;
1285}
1286
1287int
864dbfa3 1288Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1289{
27da23d5 1290 dVAR;
7918f24d 1291 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL		 1292 PERL_UNUSED_ARG(sv);
1293 PERL_UNUSED_ARG(mg);
b0269e46
AB		 1294#if defined(VMS)
1295 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1296#else
1297 my_clearenv();
1298#endif
3e3baf6d 1299 return 0;
66b1d557
HM		 1300}
1301
64ca3a65 1302#ifndef PERL_MICRO
2d4fcd5e
AJ		 1303#ifdef HAS_SIGPROCMASK
1304static void
1305restore_sigmask(pTHX_ SV *save_sv)
1306{
0bd48802 1307 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1308 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ		 1309}
1310#endif
66b1d557 1311int
864dbfa3 1312Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1313{
97aff369 1314 dVAR;
88e89b8a 1315 /* Are we fetching a signal entry? */
708854f2 1316 int i = (I16)mg->mg_private;
7918f24d
NC		 1317
1318 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1319
708854f2
NC		 1320 if (!i) {
1321 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1322 }
1323
e02bfb16 1324 if (i > 0) {
22c35a8c
GS		 1325 if(PL_psig_ptr[i])
1326 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1327 else {
46da273f 1328 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1329#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL		 1330 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1331 sigstate = SIG_IGN;
2e34cc90
CL		 1332#endif
1333#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL		 1334 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1335 sigstate = SIG_DFL;
85b332e2 1336#endif
88e89b8a 1337 /* cache state so we don't fetch it again */
8aad04aa 1338 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1339 sv_setpvs(sv,"IGNORE");
88e89b8a 1340 else
3280af22 1341 sv_setsv(sv,&PL_sv_undef);
46da273f 1342 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a 1343 SvTEMP_off(sv);
1344 }
1345 }
1346 return 0;
1347}
1348int
864dbfa3 1349Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1350{
7918f24d 1351 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
8772537c 1352 PERL_UNUSED_ARG(sv);
179c85a2 1353
38a124f0 1354 magic_setsig(NULL, mg);
179c85a2 1355 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1356}
3d37d572 1357
0a8e0eff 1358Signal_t
8aad04aa 1359#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1360Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1361#else
0a8e0eff 1362Perl_csighandler(int sig)
8aad04aa 1363#endif
0a8e0eff 1364{
1018e26f
NIS		 1365#ifdef PERL_GET_SIG_CONTEXT
1366 dTHXa(PERL_GET_SIG_CONTEXT);
1367#else
85b332e2
CL		 1368 dTHX;
1369#endif
23ada85b 1370#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1371 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1372 if (PL_sig_ignoring[sig]) return;
85b332e2 1373#endif
2e34cc90 1374#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1375 if (PL_sig_defaulting[sig])
2e34cc90
CL		 1376#ifdef KILL_BY_SIGPRC
1377 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1378#else
1379 exit(1);
1380#endif
1381#endif
406878dd 1382 if (
853d2c32
RGS		 1383#ifdef SIGILL
1384 sig == SIGILL ||
1385#endif
1386#ifdef SIGBUS
1387 sig == SIGBUS ||
1388#endif
1389#ifdef SIGSEGV
1390 sig == SIGSEGV ||
1391#endif
1392 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1393 /* Call the perl level handler now--
31c91b43 1394 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1395#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1396 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB		 1397#else
1398 (*PL_sighandlerp)(sig);
92807b6d 1399#endif
406878dd 1400 else {
31c91b43 1401 if (!PL_psig_pend) return;
406878dd
GA		 1402 /* Set a flag to say this signal is pending, that is awaiting delivery after
1403 * the current Perl opcode completes */
1404 PL_psig_pend[sig]++;
1405
1406#ifndef SIG_PENDING_DIE_COUNT
1407# define SIG_PENDING_DIE_COUNT 120
1408#endif
fe13d51d 1409 /* Add one to say _a_ signal is pending */
406878dd
GA		 1410 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1411 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1412 (unsigned long)SIG_PENDING_DIE_COUNT);
1413 }
0a8e0eff
NIS		 1414}
1415
2e34cc90
CL		 1416#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1417void
1418Perl_csighandler_init(void)
1419{
1420 int sig;
27da23d5 1421 if (PL_sig_handlers_initted) return;
2e34cc90
CL		 1422
1423 for (sig = 1; sig < SIG_SIZE; sig++) {
1424#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1425 dTHX;
27da23d5 1426 PL_sig_defaulting[sig] = 1;
5c1546dc 1427 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL		 1428#endif
1429#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1430 PL_sig_ignoring[sig] = 0;
2e34cc90
CL		 1431#endif
1432 }
27da23d5 1433 PL_sig_handlers_initted = 1;
2e34cc90
CL		 1434}
1435#endif
1436
0a8e0eff
NIS		 1437void
1438Perl_despatch_signals(pTHX)
1439{
97aff369 1440 dVAR;
0a8e0eff
NIS		 1441 int sig;
1442 PL_sig_pending = 0;
1443 for (sig = 1; sig < SIG_SIZE; sig++) {
1444 if (PL_psig_pend[sig]) {
d0166017 1445 dSAVE_ERRNO;
55534442
LT		 1446#if defined(HAS_SIGPROCMASK)
1447 /* From sigaction(2) (FreeBSD man page):
1448 * | Signal routines normally execute with the signal that
1449 * | caused their invocation blocked, but other signals may
1450 * | yet occur.
1451 * Emulation of this behavior (from within Perl) is enabled
1452 * using sigprocmask
1453 */
1454 int was_blocked;
1455 sigset_t newset, oldset;
1456
1457 sigemptyset(&newset);
1458 sigaddset(&newset, sig);
1459 sigprocmask(SIG_BLOCK, &newset, &oldset);
1460 was_blocked = sigismember(&oldset, sig);
1461#endif
25da4428 1462 PL_psig_pend[sig] = 0;
6e324d09 1463#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1464 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB		 1465#else
1466 (*PL_sighandlerp)(sig);
92807b6d 1467#endif
55534442
LT		 1468#if defined(HAS_SIGPROCMASK)
1469 if (!was_blocked)
1470 sigprocmask(SIG_UNBLOCK, &newset, NULL);
1471#endif
d0166017 1472 RESTORE_ERRNO;
0a8e0eff
NIS		 1473 }
1474 }
1475}
1476
38a124f0 1477/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1478int
864dbfa3 1479Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1480{
27da23d5 1481 dVAR;
79072805 1482 I32 i;
cbbf8932 1483 SV** svp = NULL;
2d4fcd5e
AJ		 1484 /* Need to be careful with SvREFCNT_dec(), because that can have side
1485 * effects (due to closures). We must make sure that the new disposition
1486 * is in place before it is called.
1487 */
cbbf8932 1488 SV* to_dec = NULL;
e72dc28c 1489 STRLEN len;
2d4fcd5e
AJ		 1490#ifdef HAS_SIGPROCMASK
1491 sigset_t set, save;
1492 SV* save_sv;
1493#endif
d5263905 1494 register const char *s = MgPV_const(mg,len);
7918f24d
NC		 1495
1496 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1497
748a9306
LW		 1498 if (*s == '_') {
1499 if (strEQ(s,"__DIE__"))
3280af22 1500 svp = &PL_diehook;
38a124f0
NC		 1501 else if (strEQ(s,"__WARN__")
1502 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1503 /* Merge the existing behaviours, which are as follows:
1504 magic_setsig, we always set svp to &PL_warnhook
1505 (hence we always change the warnings handler)
1506 For magic_clearsig, we don't change the warnings handler if it's
1507 set to the &PL_warnhook. */
3280af22 1508 svp = &PL_warnhook;
38a124f0 1509 } else if (sv)
cea2e8a9 1510 Perl_croak(aTHX_ "No such hook: %s", s);
748a9306 1511 i = 0;
38a124f0 1512 if (svp && *svp) {
9289f461
RGS		 1513 if (*svp != PERL_WARNHOOK_FATAL)
1514 to_dec = *svp;
cbbf8932 1515 *svp = NULL;
4633a7c4 1516 }
748a9306
LW		 1517 }
1518 else {
708854f2
NC		 1519 i = (I16)mg->mg_private;
1520 if (!i) {
58a26b12
NC		 1521 i = whichsig(s); /* ...no, a brick */
1522 mg->mg_private = (U16)i;
708854f2 1523 }
86d86cad 1524 if (i <= 0) {
a2a5de95
NC		 1525 if (sv)
1526 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
748a9306
LW		 1527 return 0;
1528 }
2d4fcd5e
AJ		 1529#ifdef HAS_SIGPROCMASK
1530 /* Avoid having the signal arrive at a bad time, if possible. */
1531 sigemptyset(&set);
1532 sigaddset(&set,i);
1533 sigprocmask(SIG_BLOCK, &set, &save);
1534 ENTER;
9ff8e806 1535 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ		 1536 SAVEFREESV(save_sv);
1537 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1538#endif
1539 PERL_ASYNC_CHECK();
2e34cc90 1540#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1541 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1542#endif
23ada85b 1543#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1544 PL_sig_ignoring[i] = 0;
85b332e2 1545#endif
2e34cc90 1546#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1547 PL_sig_defaulting[i] = 0;
2e34cc90 1548#endif
2d4fcd5e 1549 to_dec = PL_psig_ptr[i];
38a124f0
NC		 1550 if (sv) {
1551 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1552 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC		 1553
1554 /* Signals don't change name during the program's execution, so once
1555 they're cached in the appropriate slot of PL_psig_name, they can
1556 stay there.
1557
1558 Ideally we'd find some way of making SVs at (C) compile time, or
1559 at least, doing most of the work. */
1560 if (!PL_psig_name[i]) {
1561 PL_psig_name[i] = newSVpvn(s, len);
1562 SvREADONLY_on(PL_psig_name[i]);
1563 }
38a124f0 1564 } else {
79fd3822 1565 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC		 1566 PL_psig_name[i] = NULL;
1567 PL_psig_ptr[i] = NULL;
1568 }
748a9306 1569 }
38a124f0 1570 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1571 if (i) {
5c1546dc 1572 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1573 }
748a9306 1574 else
b37c2d43 1575 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1576 } else {
9dfa190b
NC		 1577 if (sv && SvOK(sv)) {
1578 s = SvPV_force(sv, len);
1579 } else {
1580 sv = NULL;
1581 }
1582 if (sv && strEQ(s,"IGNORE")) {
1583 if (i) {
23ada85b 1584#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC		 1585 PL_sig_ignoring[i] = 1;
1586 (void)rsignal(i, PL_csighandlerp);
85b332e2 1587#else
9dfa190b 1588 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1589#endif
9dfa190b 1590 }
2d4fcd5e 1591 }
9dfa190b
NC		 1592 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1593 if (i) {
2e34cc90 1594#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC		 1595 PL_sig_defaulting[i] = 1;
1596 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1597#else
9dfa190b 1598 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1599#endif
9dfa190b
NC		 1600 }
1601 }
1602 else {
1603 /*
1604 * We should warn if HINT_STRICT_REFS, but without
1605 * access to a known hint bit in a known OP, we can't
1606 * tell whether HINT_STRICT_REFS is in force or not.
1607 */
1608 if (!strchr(s,':') && !strchr(s,'\''))
1609 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1610 SV_GMAGIC);
1611 if (i)
1612 (void)rsignal(i, PL_csighandlerp);
1613 else
1614 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1615 }
748a9306 1616 }
9dfa190b 1617
2d4fcd5e
AJ		 1618#ifdef HAS_SIGPROCMASK
1619 if(i)
1620 LEAVE;
1621#endif
ef8d46e8 1622 SvREFCNT_dec(to_dec);
79072805
LW		 1623 return 0;
1624}
64ca3a65 1625#endif /* !PERL_MICRO */
79072805
LW		 1626
1627int
864dbfa3 1628Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1629{
97aff369 1630 dVAR;
7918f24d 1631 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1632 PERL_UNUSED_ARG(sv);
e1a479c5 1633
89c14e2e 1634 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1635 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB		 1636 return 0;
1637
0e446081 1638 return magic_clearisa(NULL, mg);
463ee0b2
LW		 1639}
1640
0e446081 1641/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1642int
52b45067
RD		 1643Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1644{
1645 dVAR;
1646 HV* stash;
1647
7918f24d
NC		 1648 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1649
52b45067 1650 /* Bail out if destruction is going on */
627364f1 1651 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1652
0e446081
NC		 1653 if (sv)
1654 av_clear(MUTABLE_AV(sv));
52b45067 1655
6624142a
FC		 1656 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1657 /* This occurs with setisa_elem magic, which calls this
1658 same function. */
1659 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1660
1661 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1662 SV **svp = AvARRAY((AV *)mg->mg_obj);
1663 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1664 while (items--) {
1665 stash = GvSTASH((GV *)*svp++);
1666 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1667 }
1668
1669 return 0;
1670 }
1671
52b45067 1672 stash = GvSTASH(
6624142a 1673 (const GV *)mg->mg_obj
52b45067
RD		 1674 );
1675
00169e2c
FC		 1676 /* The stash may have been detached from the symbol table, so check its
1677 name before doing anything. */
1678 if (stash && HvENAME_get(stash))
5562fa71 1679 mro_isa_changed_in(stash);
52b45067
RD		 1680
1681 return 0;
1682}
1683
1684int
864dbfa3 1685Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1686{
97aff369 1687 dVAR;
7918f24d 1688 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
8772537c
AL		 1689 PERL_UNUSED_ARG(sv);
1690 PERL_UNUSED_ARG(mg);
3280af22 1691 PL_amagic_generation++;
463ee0b2 1692
a0d0e21e
LW		 1693 return 0;
1694}
463ee0b2 1695
946ec16e 1696int
864dbfa3 1697Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1698{
85fbaab2 1699 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1700 I32 i = 0;
7918f24d
NC		 1701
1702 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1703 PERL_UNUSED_ARG(mg);
7719e241 1704
6ff81951 1705 if (hv) {
497b47a8 1706 (void) hv_iterinit(hv);
ad64d0ec 1707 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
497b47a8
JH		 1708 i = HvKEYS(hv);
1709 else {
1710 while (hv_iternext(hv))
1711 i++;
1712 }
6ff81951
GS		 1713 }
1714
1715 sv_setiv(sv, (IV)i);
1716 return 0;
1717}
1718
1719int
864dbfa3 1720Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1721{
7918f24d 1722 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1723 PERL_UNUSED_ARG(mg);
946ec16e 1724 if (LvTARG(sv)) {
85fbaab2 1725 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e 1726 }
1727 return 0;
ac27b0f5 1728}
946ec16e 1729
efaf3674
DM		 1730/*
1731=for apidoc magic_methcall
1732
1733Invoke a magic method (like FETCH).
1734
1735* sv and mg are the tied thinggy and the tie magic;
1736* meth is the name of the method to call;
1a1a5af7
DM		 1737* argc is the number of args (in addition to $self) to pass to the method;
1738 the args themselves are any values following the argc argument.
efaf3674
DM		 1739* flags:
1740 G_DISCARD: invoke method with G_DISCARD flag and don't return a value
1a1a5af7 1741 G_UNDEF_FILL: fill the stack with argc pointers to PL_sv_undef.
efaf3674
DM		 1742
1743Returns the SV (if any) returned by the method, or NULL on failure.
1744
1745
1746=cut
1747*/
1748
1749SV*
c7a0c747 1750Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
046b0c7d 1751 U32 argc, ...)
a0d0e21e 1752{
97aff369 1753 dVAR;
a0d0e21e 1754 dSP;
efaf3674 1755 SV* ret = NULL;
463ee0b2 1756
7918f24d
NC		 1757 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1758
efaf3674 1759 ENTER;
d1d7a15d
NC		 1760
1761 if (flags & G_WRITING_TO_STDERR) {
1762 SAVETMPS;
1763
1764 save_re_context();
1765 SAVESPTR(PL_stderrgv);
1766 PL_stderrgv = NULL;
1767 }
1768
efaf3674 1769 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1770 PUSHMARK(SP);
efaf3674 1771
67549bd2
NC		 1772 EXTEND(SP, argc+1);
1773 PUSHs(SvTIED_obj(sv, mg));
1774 if (flags & G_UNDEF_FILL) {
1775 while (argc--) {
efaf3674 1776 PUSHs(&PL_sv_undef);
93965878 1777 }
67549bd2 1778 } else if (argc > 0) {
046b0c7d
NC		 1779 va_list args;
1780 va_start(args, argc);
1781
1782 do {
1783 SV *const sv = va_arg(args, SV *);
1784 PUSHs(sv);
1785 } while (--argc);
1786
1787 va_end(args);
88e89b8a 1788 }
463ee0b2 1789 PUTBACK;
efaf3674
DM		 1790 if (flags & G_DISCARD) {
1791 call_method(meth, G_SCALAR|G_DISCARD);
1792 }
1793 else {
1794 if (call_method(meth, G_SCALAR))
1795 ret = *PL_stack_sp--;
1796 }
1797 POPSTACK;
d1d7a15d
NC		 1798 if (flags & G_WRITING_TO_STDERR)
1799 FREETMPS;
efaf3674
DM		 1800 LEAVE;
1801 return ret;
1802}
1803
1804
1805/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1806
efaf3674 1807STATIC SV*
c7a0c747 1808S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
efaf3674
DM		 1809 int n, SV *val)
1810{
1811 dVAR;
1812 SV* arg1 = NULL;
1813
1814 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1815
1816 if (mg->mg_ptr) {
1817 if (mg->mg_len >= 0) {
db4b3a1d 1818 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM		 1819 }
1820 else if (mg->mg_len == HEf_SVKEY)
1821 arg1 = MUTABLE_SV(mg->mg_ptr);
1822 }
1823 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1824 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM		 1825 sv_2mortal(arg1);
1826 }
1827 if (!arg1) {
046b0c7d 1828 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1829 }
046b0c7d 1830 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e 1831}
1832
76e3520e 1833STATIC int
e1ec3a88 1834S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
a0d0e21e 1835{
efaf3674
DM		 1836 dVAR;
1837 SV* ret;
463ee0b2 1838
7918f24d
NC		 1839 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1840
efaf3674
DM		 1841 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1842 if (ret)
1843 sv_setsv(sv, ret);
a0d0e21e
LW		 1844 return 0;
1845}
463ee0b2 1846
a0d0e21e 1847int
864dbfa3 1848Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1849{
7918f24d
NC		 1850 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1851
fd69380d 1852 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1853 mg->mg_flags |= MGf_GSKIP;
58f82c5c 1854 magic_methpack(sv,mg,"FETCH");
463ee0b2
LW		 1855 return 0;
1856}
1857
1858int
864dbfa3 1859Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1860{
efaf3674 1861 dVAR;
b112cff9
DM		 1862 MAGIC *tmg;
1863 SV *val;
7918f24d
NC		 1864
1865 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1866
b112cff9
DM		 1867 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1868 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1869 * public flags indicate its value based on copying from $val. Doing
1870 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1871 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1872 * wrong if $val happened to be tainted, as sv hasn't got magic
1873 * enabled, even though taint magic is in the chain. In which case,
1874 * fake up a temporary tainted value (this is easier than temporarily
1875 * re-enabling magic on sv). */
1876
1877 if (PL_tainting && (tmg = mg_find(sv, PERL_MAGIC_taint))
1878 && (tmg->mg_len & 1))
1879 {
1880 val = sv_mortalcopy(sv);
1881 SvTAINTED_on(val);
1882 }
1883 else
1884 val = sv;
1885
efaf3674 1886 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val);
463ee0b2
LW		 1887 return 0;
1888}
1889
1890int
864dbfa3 1891Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1892{
7918f24d
NC		 1893 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1894
a0d0e21e
LW		 1895 return magic_methpack(sv,mg,"DELETE");
1896}
463ee0b2 1897
93965878
NIS		 1898
1899U32
864dbfa3 1900Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1901{
efaf3674 1902 dVAR;
22846ab4 1903 I32 retval = 0;
efaf3674 1904 SV* retsv;
93965878 1905
7918f24d
NC		 1906 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1907
efaf3674
DM		 1908 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL);
1909 if (retsv) {
1910 retval = SvIV(retsv)-1;
22846ab4
AB		 1911 if (retval < -1)
1912 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1913 }
22846ab4 1914 return (U32) retval;
93965878
NIS		 1915}
1916
cea2e8a9
GS		 1917int
1918Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1919{
efaf3674 1920 dVAR;
463ee0b2 1921
7918f24d
NC		 1922 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1923
046b0c7d 1924 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0);
463ee0b2
LW		 1925 return 0;
1926}
1927
1928int
864dbfa3 1929Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1930{
efaf3674
DM		 1931 dVAR;
1932 SV* ret;
463ee0b2 1933
7918f24d
NC		 1934 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1935
046b0c7d
NC		 1936 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key)
1937 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0);
efaf3674
DM		 1938 if (ret)
1939 sv_setsv(key,ret);
79072805
LW		 1940 return 0;
1941}
1942
1943int
1146e912 1944Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1945{
7918f24d
NC		 1946 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1947
a0d0e21e 1948 return magic_methpack(sv,mg,"EXISTS");
ac27b0f5 1949}
a0d0e21e 1950
a3bcc51e
TP		 1951SV *
1952Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1953{
efaf3674 1954 dVAR;
5fcbf73d 1955 SV *retval;
ad64d0ec
NC		 1956 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1957 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1958
7918f24d
NC		 1959 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1960
a3bcc51e
TP		 1961 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1962 SV *key;
bfcb3514 1963 if (HvEITER_get(hv))
a3bcc51e
TP		 1964 /* we are in an iteration so the hash cannot be empty */
1965 return &PL_sv_yes;
1966 /* no xhv_eiter so now use FIRSTKEY */
1967 key = sv_newmortal();
ad64d0ec 1968 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1969 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP		 1970 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1971 }
1972
1973 /* there is a SCALAR method that we can call */
046b0c7d 1974 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0);
efaf3674 1975 if (!retval)
5fcbf73d 1976 retval = &PL_sv_undef;
a3bcc51e
TP		 1977 return retval;
1978}
1979
a0d0e21e 1980int
864dbfa3 1981Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1982{
97aff369 1983 dVAR;
8772537c
AL		 1984 GV * const gv = PL_DBline;
1985 const I32 i = SvTRUE(sv);
1986 SV ** const svp = av_fetch(GvAV(gv),
01b8bcb7 1987 atoi(MgPV_nolen_const(mg)), FALSE);
7918f24d
NC		 1988
1989 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1990
8772537c
AL		 1991 if (svp && SvIOKp(*svp)) {
1992 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1993 if (o) {
1994 /* set or clear breakpoint in the relevant control op */
1995 if (i)
1996 o->op_flags |= OPf_SPECIAL;
1997 else
1998 o->op_flags &= ~OPf_SPECIAL;
1999 }
5df8de69 2000 }
79072805
LW		 2001 return 0;
2002}
2003
2004int
8772537c 2005Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2006{
97aff369 2007 dVAR;
502c6561 2008 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC		 2009
2010 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2011
83bf042f 2012 if (obj) {
fc15ae8f 2013 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
83bf042f
NC		 2014 } else {
2015 SvOK_off(sv);
2016 }
79072805
LW		 2017 return 0;
2018}
2019
2020int
864dbfa3 2021Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2022{
97aff369 2023 dVAR;
502c6561 2024 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC		 2025
2026 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2027
83bf042f 2028 if (obj) {
fc15ae8f 2029 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
83bf042f 2030 } else {
a2a5de95
NC		 2031 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2032 "Attempt to set length of freed array");
83bf042f
NC		 2033 }
2034 return 0;
2035}
2036
2037int
2038Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2039{
97aff369 2040 dVAR;
7918f24d
NC		 2041
2042 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2043 PERL_UNUSED_ARG(sv);
7918f24d 2044
94f3782b
DM		 2045 /* during global destruction, mg_obj may already have been freed */
2046 if (PL_in_clean_all)
1ea47f64 2047 return 0;
94f3782b 2048
83bf042f
NC		 2049 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2050
2051 if (mg) {
2052 /* arylen scalar holds a pointer back to the array, but doesn't own a
2053 reference. Hence the we (the array) are about to go away with it
2054 still pointing at us. Clear its pointer, else it would be pointing
2055 at free memory. See the comment in sv_magic about reference loops,
2056 and why it can't own a reference to us. */
2057 mg->mg_obj = 0;
2058 }
a0d0e21e
LW		 2059 return 0;
2060}
2061
2062int
864dbfa3 2063Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2064{
97aff369 2065 dVAR;
8772537c 2066 SV* const lsv = LvTARG(sv);
7918f24d
NC		 2067
2068 PERL_ARGS_ASSERT_MAGIC_GETPOS;
3881461a 2069 PERL_UNUSED_ARG(mg);
ac27b0f5 2070
a0d0e21e 2071 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
3881461a
AL		 2072 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
2073 if (found && found->mg_len >= 0) {
2074 I32 i = found->mg_len;
7e2040f0 2075 if (DO_UTF8(lsv))
a0ed51b3 2076 sv_pos_b2u(lsv, &i);
fc15ae8f 2077 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
a0d0e21e
LW		 2078 return 0;
2079 }
2080 }
0c34ef67 2081 SvOK_off(sv);
a0d0e21e
LW		 2082 return 0;
2083}
2084
2085int
864dbfa3 2086Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2087{
97aff369 2088 dVAR;
8772537c 2089 SV* const lsv = LvTARG(sv);
a0d0e21e
LW		 2090 SSize_t pos;
2091 STRLEN len;
c00206c8 2092 STRLEN ulen = 0;
53d44271 2093 MAGIC* found;
a0d0e21e 2094
7918f24d 2095 PERL_ARGS_ASSERT_MAGIC_SETPOS;
3881461a 2096 PERL_UNUSED_ARG(mg);
ac27b0f5 2097
a0d0e21e 2098 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
3881461a
AL		 2099 found = mg_find(lsv, PERL_MAGIC_regex_global);
2100 else
2101 found = NULL;
2102 if (!found) {
a0d0e21e
LW		 2103 if (!SvOK(sv))
2104 return 0;
d83f0a82
NC		 2105#ifdef PERL_OLD_COPY_ON_WRITE
2106 if (SvIsCOW(lsv))
2107 sv_force_normal_flags(lsv, 0);
2108#endif
3881461a 2109 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
53d44271 2110 NULL, 0);
a0d0e21e
LW		 2111 }
2112 else if (!SvOK(sv)) {
3881461a 2113 found->mg_len = -1;
a0d0e21e
LW		 2114 return 0;
2115 }
2116 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2117
fc15ae8f 2118 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
a0ed51b3 2119
7e2040f0 2120 if (DO_UTF8(lsv)) {
a0ed51b3
LW		 2121 ulen = sv_len_utf8(lsv);
2122 if (ulen)
2123 len = ulen;
a0ed51b3
LW		 2124 }
2125
a0d0e21e
LW		 2126 if (pos < 0) {
2127 pos += len;
2128 if (pos < 0)
2129 pos = 0;
2130 }
eb160463 2131 else if (pos > (SSize_t)len)
a0d0e21e 2132 pos = len;
a0ed51b3
LW		 2133
2134 if (ulen) {
2135 I32 p = pos;
2136 sv_pos_u2b(lsv, &p, 0);
2137 pos = p;
2138 }
727405f8 2139
3881461a
AL		 2140 found->mg_len = pos;
2141 found->mg_flags &= ~MGf_MINMATCH;
a0d0e21e 2142
79072805
LW		 2143 return 0;
2144}
2145
2146int
864dbfa3 2147Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS		 2148{
2149 STRLEN len;
35a4481c 2150 SV * const lsv = LvTARG(sv);
b83604b4 2151 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB		 2152 STRLEN offs = LvTARGOFF(sv);
2153 STRLEN rem = LvTARGLEN(sv);
7918f24d
NC		 2154
2155 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2156 PERL_UNUSED_ARG(mg);
6ff81951 2157
9aa983d2 2158 if (SvUTF8(lsv))
d931b1be 2159 offs = sv_pos_u2b_flags(lsv, offs, &rem, SV_CONST_RETURN);
777f7c56 2160 if (offs > len)
6ff81951 2161 offs = len;
777f7c56 2162 if (rem > len - offs)
6ff81951 2163 rem = len - offs;
1c900557 2164 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2165 if (SvUTF8(lsv))
2ef4b674 2166 SvUTF8_on(sv);
6ff81951
GS		 2167 return 0;
2168}
2169
2170int
864dbfa3 2171Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2172{
97aff369 2173 dVAR;
9aa983d2 2174 STRLEN len;
5fcbf73d 2175 const char * const tmps = SvPV_const(sv, len);
dd374669 2176 SV * const lsv = LvTARG(sv);
777f7c56
EB		 2177 STRLEN lvoff = LvTARGOFF(sv);
2178 STRLEN lvlen = LvTARGLEN(sv);
7918f24d
NC		 2179
2180 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2181 PERL_UNUSED_ARG(mg);
075a4a2b 2182
1aa99e6b 2183 if (DO_UTF8(sv)) {
9aa983d2 2184 sv_utf8_upgrade(lsv);
d931b1be 2185 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
9aa983d2 2186 sv_insert(lsv, lvoff, lvlen, tmps, len);
b76f3ce2 2187 LvTARGLEN(sv) = sv_len_utf8(sv);
9aa983d2
JH		 2188 SvUTF8_on(lsv);
2189 }
9bf12eaf 2190 else if (lsv && SvUTF8(lsv)) {
5fcbf73d 2191 const char *utf8;
d931b1be 2192 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
b76f3ce2 2193 LvTARGLEN(sv) = len;
5fcbf73d
AL		 2194 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2195 sv_insert(lsv, lvoff, lvlen, utf8, len);
2196 Safefree(utf8);
1aa99e6b 2197 }
b76f3ce2
GB		 2198 else {
2199 sv_insert(lsv, lvoff, lvlen, tmps, len);
2200 LvTARGLEN(sv) = len;
2201 }
2202
79072805
LW		 2203 return 0;
2204}
2205
2206int
864dbfa3 2207Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2208{
97aff369 2209 dVAR;
7918f24d
NC		 2210
2211 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2212 PERL_UNUSED_ARG(sv);
7918f24d 2213
27cc343c 2214 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW		 2215 return 0;
2216}
2217
2218int
864dbfa3 2219Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2220{
97aff369 2221 dVAR;
7918f24d
NC		 2222
2223 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2224 PERL_UNUSED_ARG(sv);
7918f24d 2225
b01e650a
DM		 2226 /* update taint status */
2227 if (PL_tainted)
2228 mg->mg_len |= 1;
2229 else
2230 mg->mg_len &= ~1;
463ee0b2
LW		 2231 return 0;
2232}
2233
2234int
864dbfa3 2235Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2236{
35a4481c 2237 SV * const lsv = LvTARG(sv);
7918f24d
NC		 2238
2239 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2240 PERL_UNUSED_ARG(mg);
6ff81951 2241
6136c704
AL		 2242 if (lsv)
2243 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2244 else
0c34ef67 2245 SvOK_off(sv);
6ff81951 2246
6ff81951
GS		 2247 return 0;
2248}
2249
2250int
864dbfa3 2251Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2252{
7918f24d 2253 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2254 PERL_UNUSED_ARG(mg);
79072805
LW		 2255 do_vecset(sv); /* XXX slurp this routine */
2256 return 0;
2257}
2258
2259int
864dbfa3 2260Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2261{
97aff369 2262 dVAR;
a0714e2c 2263 SV *targ = NULL;
7918f24d
NC		 2264
2265 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2266
5f05dabc 2267 if (LvTARGLEN(sv)) {
68dc0745 2268 if (mg->mg_obj) {
8772537c 2269 SV * const ahv = LvTARG(sv);
85fbaab2 2270 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS		 2271 if (he)
2272 targ = HeVAL(he);
68dc0745 2273 }
2274 else {
502c6561 2275 AV *const av = MUTABLE_AV(LvTARG(sv));
68dc0745 2276 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2277 targ = AvARRAY(av)[LvTARGOFF(sv)];
2278 }
46da273f 2279 if (targ && (targ != &PL_sv_undef)) {
68dc0745 2280 /* somebody else defined it for us */
2281 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2282 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745 2283 LvTARGLEN(sv) = 0;
2284 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2285 mg->mg_obj = NULL;
68dc0745 2286 mg->mg_flags &= ~MGf_REFCOUNTED;
2287 }
5f05dabc 2288 }
71be2cbc 2289 else
2290 targ = LvTARG(sv);
3280af22 2291 sv_setsv(sv, targ ? targ : &PL_sv_undef);
71be2cbc 2292 return 0;
2293}
2294
2295int
864dbfa3 2296Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2297{
7918f24d 2298 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2299 PERL_UNUSED_ARG(mg);
71be2cbc 2300 if (LvTARGLEN(sv))
68dc0745 2301 vivify_defelem(sv);
2302 if (LvTARG(sv)) {
5f05dabc 2303 sv_setsv(LvTARG(sv), sv);
68dc0745 2304 SvSETMAGIC(LvTARG(sv));
2305 }
5f05dabc 2306 return 0;
2307}
2308
71be2cbc 2309void
864dbfa3 2310Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2311{
97aff369 2312 dVAR;
74e13ce4 2313 MAGIC *mg;
a0714e2c 2314 SV *value = NULL;
71be2cbc 2315
7918f24d
NC		 2316 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2317
14befaf4 2318 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2319 return;
68dc0745 2320 if (mg->mg_obj) {
8772537c 2321 SV * const ahv = LvTARG(sv);
85fbaab2 2322 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS		 2323 if (he)
2324 value = HeVAL(he);
3280af22 2325 if (!value || value == &PL_sv_undef)
be2597df 2326 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2327 }
68dc0745 2328 else {
502c6561 2329 AV *const av = MUTABLE_AV(LvTARG(sv));
5aabfad6 2330 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
a0714e2c 2331 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2332 else {
d4c19fe8 2333 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
3280af22 2334 if (!svp || (value = *svp) == &PL_sv_undef)
cea2e8a9 2335 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
68dc0745 2336 }
2337 }
b37c2d43 2338 SvREFCNT_inc_simple_void(value);
68dc0745 2339 SvREFCNT_dec(LvTARG(sv));
2340 LvTARG(sv) = value;
71be2cbc 2341 LvTARGLEN(sv) = 0;
68dc0745 2342 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2343 mg->mg_obj = NULL;
68dc0745 2344 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc 2345}
2346
2347int
864dbfa3 2348Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2349{
7918f24d 2350 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM		 2351 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2352 return 0;
810b8aa5
GS		 2353}
2354
2355int
864dbfa3 2356Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2357{
7918f24d 2358 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2359 PERL_UNUSED_CONTEXT;
565764a8 2360 mg->mg_len = -1;
1f730e6c
FC		 2361 if (!isGV_with_GP(sv))
2362 SvSCREAM_off(sv);
93a17b20
LW		 2363 return 0;
2364}
2365
2366int
864dbfa3 2367Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2368{
35a4481c 2369 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2370
7918f24d
NC		 2371 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2372
79072805 2373 if (uf && uf->uf_set)
24f81a43 2374 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW		 2375 return 0;
2376}
2377
c277df42 2378int
faf82a0b
AE		 2379Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2380{
488344d2 2381 const char type = mg->mg_type;
7918f24d
NC		 2382
2383 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2384
488344d2
NC		 2385 if (type == PERL_MAGIC_qr) {
2386 } else if (type == PERL_MAGIC_bm) {
2387 SvTAIL_off(sv);
2388 SvVALID_off(sv);
2389 } else {
2390 assert(type == PERL_MAGIC_fm);
2391 SvCOMPILED_off(sv);
2392 }
2393 return sv_unmagic(sv, type);
faf82a0b
AE		 2394}
2395
7a4c00b4 2396#ifdef USE_LOCALE_COLLATE
79072805 2397int
864dbfa3 2398Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2399{
7918f24d
NC		 2400 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2401
bbce6d69 2402 /*
838b5b74 2403 * RenE<eacute> Descartes said "I think not."
bbce6d69 2404 * and vanished with a faint plop.
2405 */
96a5add6 2406 PERL_UNUSED_CONTEXT;
8772537c 2407 PERL_UNUSED_ARG(sv);
7a4c00b4 2408 if (mg->mg_ptr) {
2409 Safefree(mg->mg_ptr);
2410 mg->mg_ptr = NULL;
565764a8 2411 mg->mg_len = -1;
7a4c00b4 2412 }
bbce6d69 2413 return 0;
2414}
7a4c00b4 2415#endif /* USE_LOCALE_COLLATE */
bbce6d69 2416
7e8c5dac
HS		 2417/* Just clear the UTF-8 cache data. */
2418int
2419Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2420{
7918f24d 2421 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2422 PERL_UNUSED_CONTEXT;
8772537c 2423 PERL_UNUSED_ARG(sv);
7e8c5dac 2424 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2425 mg->mg_ptr = NULL;
7e8c5dac
HS		 2426 mg->mg_len = -1; /* The mg_len holds the len cache. */
2427 return 0;
2428}
2429
bbce6d69 2430int
864dbfa3 2431Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2432{
97aff369 2433 dVAR;
e1ec3a88 2434 register const char *s;
2fdbfb4d
AB		 2435 register I32 paren;
2436 register const REGEXP * rx;
2437 const char * const remaining = mg->mg_ptr + 1;
79072805 2438 I32 i;
8990e307 2439 STRLEN len;
125b9982 2440 MAGIC *tmg;
2fdbfb4d 2441
7918f24d
NC		 2442 PERL_ARGS_ASSERT_MAGIC_SET;
2443
79072805 2444 switch (*mg->mg_ptr) {
2fdbfb4d
AB		 2445 case '\015': /* $^MATCH */
2446 if (strEQ(remaining, "ATCH"))
2447 goto do_match;
2448 case '`': /* ${^PREMATCH} caught below */
2449 do_prematch:
f1b875a0 2450 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB		 2451 goto setparen;
2452 case '\'': /* ${^POSTMATCH} caught below */
2453 do_postmatch:
f1b875a0 2454 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB		 2455 goto setparen;
2456 case '&':
2457 do_match:
f1b875a0 2458 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d
AB		 2459 goto setparen;
2460 case '1': case '2': case '3': case '4':
2461 case '5': case '6': case '7': case '8': case '9':
104a8018 2462 paren = atoi(mg->mg_ptr);
2fdbfb4d 2463 setparen:
1e05feb3 2464 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d 2465 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2466 } else {
2fdbfb4d
AB		 2467 /* Croak with a READONLY error when a numbered match var is
2468 * set without a previous pattern match. Unless it's C<local $1>
2469 */
2470 if (!PL_localizing) {
6ad8f254 2471 Perl_croak_no_modify(aTHX);
2fdbfb4d
AB		 2472 }
2473 }
9b9e0be4 2474 break;
748a9306 2475 case '\001': /* ^A */
3280af22 2476 sv_setsv(PL_bodytarget, sv);
125b9982
NT		 2477 /* mg_set() has temporarily made sv non-magical */
2478 if (PL_tainting) {
2479 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2480 SvTAINTED_on(PL_bodytarget);
2481 else
2482 SvTAINTED_off(PL_bodytarget);
2483 }
748a9306 2484 break;
49460fe6 2485 case '\003': /* ^C */
f2338a2e 2486 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS		 2487 break;
2488
79072805 2489 case '\004': /* ^D */
b4ab917c 2490#ifdef DEBUGGING
b83604b4 2491 s = SvPV_nolen_const(sv);
ddcf8bc1 2492 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS		 2493 if (DEBUG_x_TEST || DEBUG_B_TEST)
2494 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2495#else
38ab35f8 2496 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2497#endif
79072805 2498 break;
28f23441 2499 case '\005': /* ^E */
d0063567 2500 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2501#ifdef VMS
38ab35f8 2502 set_vaxc_errno(SvIV(sv));
e37778c2
NC		 2503#else
2504# ifdef WIN32
d0063567 2505 SetLastError( SvIV(sv) );
e37778c2
NC		 2506# else
2507# ifdef OS2
38ab35f8 2508 os2_setsyserrno(SvIV(sv));
e37778c2 2509# else
d0063567 2510 /* will anyone ever use this? */
38ab35f8 2511 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ		 2512# endif
2513# endif
22fae026 2514#endif
d0063567
DK		 2515 }
2516 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
ef8d46e8 2517 SvREFCNT_dec(PL_encoding);
d0063567
DK		 2518 if (SvOK(sv) || SvGMAGICAL(sv)) {
2519 PL_encoding = newSVsv(sv);
2520 }
2521 else {
a0714e2c 2522 PL_encoding = NULL;
d0063567
DK		 2523 }
2524 }
2525 break;
79072805 2526 case '\006': /* ^F */
38ab35f8 2527 PL_maxsysfd = SvIV(sv);
79072805 2528 break;
a0d0e21e 2529 case '\010': /* ^H */
38ab35f8 2530 PL_hints = SvIV(sv);
a0d0e21e 2531 break;
9d116dd7 2532 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2533 Safefree(PL_inplace);
bd61b366 2534 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2535 break;
28f23441 2536 case '\017': /* ^O */
ac27b0f5 2537 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2538 Safefree(PL_osname);
bd61b366 2539 PL_osname = NULL;
3511154c
DM		 2540 if (SvOK(sv)) {
2541 TAINT_PROPER("assigning to $^O");
2e0de35c 2542 PL_osname = savesvpv(sv);
3511154c 2543 }
ac27b0f5
NIS		 2544 }
2545 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC		 2546 STRLEN len;
2547 const char *const start = SvPV(sv, len);
b54fc2b6 2548 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2549 SV *tmp;
8b850bd5
NC		 2550
2551
2552 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2553 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC		 2554
2555 /* Opening for input is more common than opening for output, so
2556 ensure that hints for input are sooner on linked list. */
59cd0e26 2557 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z		 2558 SvUTF8(sv))
2559 : newSVpvs_flags("", SvUTF8(sv));
2560 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2561 mg_set(tmp);
8b850bd5 2562
f747ebd6
Z		 2563 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2564 SvUTF8(sv));
2565 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2566 mg_set(tmp);
ac27b0f5 2567 }
28f23441 2568 break;
79072805 2569 case '\020': /* ^P */
2fdbfb4d
AB		 2570 if (*remaining == '\0') { /* ^P */
2571 PL_perldb = SvIV(sv);
2572 if (PL_perldb && !PL_DBsingle)
2573 init_debugger();
2574 break;
2575 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2576 goto do_prematch;
2577 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2578 goto do_postmatch;
2579 }
9b9e0be4 2580 break;
79072805 2581 case '\024': /* ^T */
88e89b8a 2582#ifdef BIG_TIME
6b88bc9c 2583 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2584#else
38ab35f8 2585 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2586#endif
79072805 2587 break;
e07ea26a
NC		 2588 case '\025': /* ^UTF8CACHE */
2589 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2590 PL_utf8cache = (signed char) sv_2iv(sv);
2591 }
2592 break;
fde18df1 2593 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH		 2594 if (*(mg->mg_ptr+1) == '\0') {
2595 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2596 i = SvIV(sv);
ac27b0f5 2597 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2598 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2599 }
599cee73 2600 }
0a378802 2601 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2602 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
d775746e
GS		 2603 if (!SvPOK(sv) && PL_localizing) {
2604 sv_setpvn(sv, WARN_NONEstring, WARNsize);
d3a7d8c7 2605 PL_compiling.cop_warnings = pWARN_NONE;
d775746e
GS		 2606 break;
2607 }
f4fc7782 2608 {
b5477537 2609 STRLEN len, i;
d3a7d8c7 2610 int accumulate = 0 ;
f4fc7782 2611 int any_fatals = 0 ;
b83604b4 2612 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH		 2613 for (i = 0 ; i < len ; ++i) {
2614 accumulate |= ptr[i] ;
2615 any_fatals |= (ptr[i] & 0xAA) ;
2616 }
4243c432
NC		 2617 if (!accumulate) {
2618 if (!specialWARN(PL_compiling.cop_warnings))
2619 PerlMemShared_free(PL_compiling.cop_warnings);
2620 PL_compiling.cop_warnings = pWARN_NONE;
2621 }
72dc9ed5
NC		 2622 /* Yuck. I can't see how to abstract this: */
2623 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2624 WARN_ALL) && !any_fatals) {
4243c432
NC		 2625 if (!specialWARN(PL_compiling.cop_warnings))
2626 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH		 2627 PL_compiling.cop_warnings = pWARN_ALL;
2628 PL_dowarn |= G_WARN_ONCE ;
727405f8 2629 }
d3a7d8c7 2630 else {
72dc9ed5
NC		 2631 STRLEN len;
2632 const char *const p = SvPV_const(sv, len);
2633
2634 PL_compiling.cop_warnings
8ee4cf24 2635 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC		 2636 p, len);
2637
d3a7d8c7
GS		 2638 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2639 PL_dowarn |= G_WARN_ONCE ;
2640 }
f4fc7782 2641
d3a7d8c7 2642 }
4438c4b7 2643 }
971a9dd3 2644 }
79072805
LW		 2645 break;
2646 case '.':
3280af22
NIS		 2647 if (PL_localizing) {
2648 if (PL_localizing == 1)
7766f137 2649 SAVESPTR(PL_last_in_gv);
748a9306 2650 }
3280af22 2651 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2652 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW		 2653 break;
2654 case '^':
099be4f1
DM		 2655 if (isGV_with_GP(PL_defoutgv)) {
2656 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2657 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2658 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2659 }
79072805
LW		 2660 break;
2661 case '~':
099be4f1
DM		 2662 if (isGV_with_GP(PL_defoutgv)) {
2663 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2664 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2665 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2666 }
79072805
LW		 2667 break;
2668 case '=':
099be4f1
DM		 2669 if (isGV_with_GP(PL_defoutgv))
2670 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW		 2671 break;
2672 case '-':
099be4f1
DM		 2673 if (isGV_with_GP(PL_defoutgv)) {
2674 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2675 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2676 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2677 }
79072805
LW		 2678 break;
2679 case '%':
099be4f1
DM		 2680 if (isGV_with_GP(PL_defoutgv))
2681 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW		 2682 break;
2683 case '|':
4b65379b 2684 {
099be4f1 2685 IO * const io = GvIO(PL_defoutgv);
720f287d
AB		 2686 if(!io)
2687 break;
38ab35f8 2688 if ((SvIV(sv)) == 0)
4b65379b
CS		 2689 IoFLAGS(io) &= ~IOf_FLUSH;
2690 else {
2691 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2692 PerlIO *ofp = IoOFP(io);
2693 if (ofp)
2694 (void)PerlIO_flush(ofp);
2695 IoFLAGS(io) |= IOf_FLUSH;
2696 }
2697 }
79072805
LW		 2698 }
2699 break;
79072805 2700 case '/':
3280af22 2701 SvREFCNT_dec(PL_rs);
8bfdd7d9 2702 PL_rs = newSVsv(sv);
79072805
LW		 2703 break;
2704 case '\\':
ef8d46e8 2705 SvREFCNT_dec(PL_ors_sv);
009c130f 2706 if (SvOK(sv) || SvGMAGICAL(sv)) {
7889fe52 2707 PL_ors_sv = newSVsv(sv);
009c130f 2708 }
e3c19b7b 2709 else {
a0714e2c 2710 PL_ors_sv = NULL;
e3c19b7b 2711 }
79072805 2712 break;
79072805 2713 case '[':
38ab35f8 2714 CopARYBASE_set(&PL_compiling, SvIV(sv));
79072805
LW		 2715 break;
2716 case '?':
ff0cee69 2717#ifdef COMPLEX_STATUS
6b88bc9c 2718 if (PL_localizing == 2) {
41cb7b2b 2719 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS		 2720 PL_statusvalue = LvTARGOFF(sv);
2721 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69 2722 }
2723 else
2724#endif
2725#ifdef VMSISH_STATUS
2726 if (VMSISH_STATUS)
fb38d079 2727 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69 2728 else
2729#endif
38ab35f8 2730 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW		 2731 break;
2732 case '!':
93189314
JH		 2733 {
2734#ifdef VMS
2735# define PERL_VMS_BANG vaxc$errno
2736#else
2737# define PERL_VMS_BANG 0
2738#endif
91487cfc 2739 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314
JH		 2740 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2741 }
79072805
LW		 2742 break;
2743 case '<':
38ab35f8 2744 PL_uid = SvIV(sv);
3280af22
NIS		 2745 if (PL_delaymagic) {
2746 PL_delaymagic |= DM_RUID;
79072805
LW		 2747 break; /* don't do magic till later */
2748 }
2749#ifdef HAS_SETRUID
b28d0864 2750 (void)setruid((Uid_t)PL_uid);
79072805
LW		 2751#else
2752#ifdef HAS_SETREUID
3280af22 2753 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
748a9306 2754#else
85e6fe83 2755#ifdef HAS_SETRESUID
b28d0864 2756 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2757#else
75870ed3 2758 if (PL_uid == PL_euid) { /* special case $< = $> */
2759#ifdef PERL_DARWIN
2760 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2761 if (PL_uid != 0 && PerlProc_getuid() == 0)
2762 (void)PerlProc_setuid(0);
2763#endif
b28d0864 2764 (void)PerlProc_setuid(PL_uid);
75870ed3 2765 } else {
d8eceb89 2766 PL_uid = PerlProc_getuid();
cea2e8a9 2767 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2768 }
79072805
LW		 2769#endif
2770#endif
85e6fe83 2771#endif
d8eceb89 2772 PL_uid = PerlProc_getuid();
79072805
LW		 2773 break;
2774 case '>':
38ab35f8 2775 PL_euid = SvIV(sv);
3280af22
NIS		 2776 if (PL_delaymagic) {
2777 PL_delaymagic |= DM_EUID;
79072805
LW		 2778 break; /* don't do magic till later */
2779 }
2780#ifdef HAS_SETEUID
3280af22 2781 (void)seteuid((Uid_t)PL_euid);
79072805
LW		 2782#else
2783#ifdef HAS_SETREUID
b28d0864 2784 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
85e6fe83
LW		 2785#else
2786#ifdef HAS_SETRESUID
6b88bc9c 2787 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
79072805 2788#else
b28d0864
NIS		 2789 if (PL_euid == PL_uid) /* special case $> = $< */
2790 PerlProc_setuid(PL_euid);
a0d0e21e 2791 else {
e8ee3774 2792 PL_euid = PerlProc_geteuid();
cea2e8a9 2793 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2794 }
79072805
LW		 2795#endif
2796#endif
85e6fe83 2797#endif
d8eceb89 2798 PL_euid = PerlProc_geteuid();
79072805
LW		 2799 break;
2800 case '(':
38ab35f8 2801 PL_gid = SvIV(sv);
3280af22
NIS		 2802 if (PL_delaymagic) {
2803 PL_delaymagic |= DM_RGID;
79072805
LW		 2804 break; /* don't do magic till later */
2805 }
2806#ifdef HAS_SETRGID
b28d0864 2807 (void)setrgid((Gid_t)PL_gid);
79072805
LW		 2808#else
2809#ifdef HAS_SETREGID
3280af22 2810 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
85e6fe83
LW		 2811#else
2812#ifdef HAS_SETRESGID
b28d0864 2813 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
79072805 2814#else
b28d0864
NIS		 2815 if (PL_gid == PL_egid) /* special case $( = $) */
2816 (void)PerlProc_setgid(PL_gid);
748a9306 2817 else {
d8eceb89 2818 PL_gid = PerlProc_getgid();
cea2e8a9 2819 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2820 }
79072805
LW		 2821#endif
2822#endif
85e6fe83 2823#endif
d8eceb89 2824 PL_gid = PerlProc_getgid();
79072805
LW		 2825 break;
2826 case ')':
5cd24f17 2827#ifdef HAS_SETGROUPS
2828 {
b83604b4 2829 const char *p = SvPV_const(sv, len);
757f63d8 2830 Groups_t *gary = NULL;
fb4089e0 2831#ifdef _SC_NGROUPS_MAX
2832 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2833
2834 if (maxgrp < 0)
2835 maxgrp = NGROUPS;
2836#else
2837 int maxgrp = NGROUPS;
2838#endif
757f63d8
SP		 2839
2840 while (isSPACE(*p))
2841 ++p;
2842 PL_egid = Atol(p);
fb4089e0 2843 for (i = 0; i < maxgrp; ++i) {
757f63d8
SP		 2844 while (*p && !isSPACE(*p))
2845 ++p;
2846 while (isSPACE(*p))
2847 ++p;
2848 if (!*p)
2849 break;
2850 if(!gary)
2851 Newx(gary, i + 1, Groups_t);
2852 else
2853 Renew(gary, i + 1, Groups_t);
2854 gary[i] = Atol(p);
2855 }
2856 if (i)
2857 (void)setgroups(i, gary);
f5a63d97 2858 Safefree(gary);
5cd24f17 2859 }
2860#else /* HAS_SETGROUPS */
38ab35f8 2861 PL_egid = SvIV(sv);
5cd24f17 2862#endif /* HAS_SETGROUPS */
3280af22
NIS		 2863 if (PL_delaymagic) {
2864 PL_delaymagic |= DM_EGID;
79072805
LW		 2865 break; /* don't do magic till later */
2866 }
2867#ifdef HAS_SETEGID
3280af22 2868 (void)setegid((Gid_t)PL_egid);
79072805
LW		 2869#else
2870#ifdef HAS_SETREGID
b28d0864 2871 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
85e6fe83
LW		 2872#else
2873#ifdef HAS_SETRESGID
b28d0864 2874 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
79072805 2875#else
b28d0864
NIS		 2876 if (PL_egid == PL_gid) /* special case $) = $( */
2877 (void)PerlProc_setgid(PL_egid);
748a9306 2878 else {
d8eceb89 2879 PL_egid = PerlProc_getegid();
cea2e8a9 2880 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2881 }
79072805
LW		 2882#endif
2883#endif
85e6fe83 2884#endif
d8eceb89 2885 PL_egid = PerlProc_getegid();
79072805
LW		 2886 break;
2887 case ':':
2d8e6c8d 2888 PL_chopset = SvPV_force(sv,len);
79072805
LW		 2889 break;
2890 case '0':
e2975953 2891 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS		 2892#ifdef HAS_SETPROCTITLE
2893 /* The BSDs don't show the argv[] in ps(1) output, they
2894 * show a string from the process struct and provide
2895 * the setproctitle() routine to manipulate that. */
a2722ac9 2896 if (PL_origalen != 1) {
b83604b4 2897 s = SvPV_const(sv, len);
98b76f99 2898# if __FreeBSD_version > 410001
9aad2c0e 2899 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS		 2900 * but not the "(perl) suffix from the ps(1)
2901 * output, because that's what ps(1) shows if the
2902 * argv[] is modified. */
6f2ad931 2903 setproctitle("-%s", s);
9aad2c0e 2904# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS		 2905 /* This doesn't really work if you assume that
2906 * $0 = 'foobar'; will wipe out 'perl' from the $0
2907 * because in ps(1) output the result will be like
2908 * sprintf("perl: %s (perl)", s)
2909 * I guess this is a security feature:
2910 * one (a user process) cannot get rid of the original name.
2911 * --jhi */
2912 setproctitle("%s", s);
2913# endif
2914 }
9d3968b2 2915#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 2916 if (PL_origalen != 1) {
17aa7f3d 2917 union pstun un;
b83604b4 2918 s = SvPV_const(sv, len);
6867be6d 2919 un.pst_command = (char *)s;
17aa7f3d
JH		 2920 pstat(PSTAT_SETCMD, un, len, 0, 0);
2921 }
9d3968b2 2922#else
2d2af554
GA		 2923 if (PL_origalen > 1) {
2924 /* PL_origalen is set in perl_parse(). */
2925 s = SvPV_force(sv,len);
2926 if (len >= (STRLEN)PL_origalen-1) {
2927 /* Longer than original, will be truncated. We assume that
2928 * PL_origalen bytes are available. */
2929 Copy(s, PL_origargv[0], PL_origalen-1, char);
2930 }
2931 else {
2932 /* Shorter than original, will be padded. */
235ac35d 2933#ifdef PERL_DARWIN
60777a0d
JH		 2934 /* Special case for Mac OS X: see [perl #38868] */
2935 const int pad = 0;
235ac35d 2936#else
8a89a4f1
MB		 2937 /* Is the space counterintuitive? Yes.
2938 * (You were expecting \0?)
2939 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2940 * --jhi */
60777a0d 2941 const int pad = ' ';
235ac35d 2942#endif
60777a0d
JH		 2943 Copy(s, PL_origargv[0], len, char);
2944 PL_origargv[0][len] = 0;
2945 memset(PL_origargv[0] + len + 1,
2946 pad, PL_origalen - len - 1);
2d2af554
GA		 2947 }
2948 PL_origargv[0][PL_origalen-1] = 0;
2949 for (i = 1; i < PL_origargc; i++)
2950 PL_origargv[i] = 0;
7636ea95
AB		 2951#ifdef HAS_PRCTL_SET_NAME
2952 /* Set the legacy process name in addition to the POSIX name on Linux */
2953 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2954 /* diag_listed_as: SKIPME */
2955 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2956 }
2957#endif
79072805 2958 }
9d3968b2 2959#endif
e2975953 2960 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW		 2961 break;
2962 }
2963 return 0;
2964}
2965
2966I32
35a4481c 2967Perl_whichsig(pTHX_ const char *sig)
79072805 2968{
aadb217d 2969 register char* const* sigv;
7918f24d
NC		 2970
2971 PERL_ARGS_ASSERT_WHICHSIG;
96a5add6 2972 PERL_UNUSED_CONTEXT;
79072805 2973
aadb217d 2974 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
79072805 2975 if (strEQ(sig,*sigv))
aadb217d 2976 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805
LW		 2977#ifdef SIGCLD
2978 if (strEQ(sig,"CHLD"))
2979 return SIGCLD;
2980#endif
2981#ifdef SIGCHLD
2982 if (strEQ(sig,"CLD"))
2983 return SIGCHLD;
2984#endif
7f1236c0 2985 return -1;
79072805
LW		 2986}
2987
ecfc5424 2988Signal_t
1e82f5a6 2989#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 2990Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
1e82f5a6
SH		 2991#else
2992Perl_sighandler(int sig)
2993#endif
79072805 2994{
1018e26f
NIS		 2995#ifdef PERL_GET_SIG_CONTEXT
2996 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 2997#else
cea2e8a9 2998 dTHX;
71d280e3 2999#endif
79072805 3000 dSP;
a0714e2c
SS		 3001 GV *gv = NULL;
3002 SV *sv = NULL;
8772537c 3003 SV * const tSv = PL_Sv;
601f1833 3004 CV *cv = NULL;
533c011a 3005 OP *myop = PL_op;
84902520 3006 U32 flags = 0;
8772537c 3007 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3008 I32 old_ss_ix = PL_savestack_ix;
71d280e3 3009
84902520 3010
727405f8 3011 if (!PL_psig_ptr[sig]) {
99ef548b 3012 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS		 3013 PL_sig_name[sig]);
3014 exit(sig);
3015 }
ff0cee69 3016
84902520
TB		 3017 /* Max number of items pushed there is 3*n or 4. We cannot fix
3018 infinity, so we fix 4 (in fact 5): */
72048cfe
DM		 3019 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3020 flags |= 1;
3280af22 3021 PL_savestack_ix += 5; /* Protect save in progress. */
0c4d3b5e 3022 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
84902520 3023 }
72048cfe
DM		 3024 if (PL_markstack_ptr < PL_markstack_max - 2) {
3025 flags |= 2;
3280af22 3026 PL_markstack_ptr++; /* Protect mark. */
72048cfe
DM		 3027 }
3028 if (PL_scopestack_ix < PL_scopestack_max - 3) {
3029 flags |= 4;
3030 PL_scopestack_ix++;
3031 }
84902520 3032 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3033 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL		 3034 || SvTYPE(cv) != SVt_PVCV) {
3035 HV *st;
f2c0649b 3036 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3037 }
84902520 3038
a0d0e21e 3039 if (!cv || !CvROOT(cv)) {
a2a5de95
NC		 3040 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3041 PL_sig_name[sig], (gv ? GvENAME(gv)
3042 : ((cv && CvGV(cv))
3043 ? GvENAME(CvGV(cv))
3044 : "__ANON__")));
00d579c5 3045 goto cleanup;
79072805
LW		 3046 }
3047
0c4d3b5e
DM		 3048 sv = PL_psig_name[sig]
3049 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3050 : newSVpv(PL_sig_name[sig],0);
72048cfe 3051 flags |= 8;
0c4d3b5e
DM		 3052 SAVEFREESV(sv);
3053
3054 /* make sure our assumption about the size of the SAVEs are correct:
3055 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3056 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
e336de0d 3057
e788e7d3 3058 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3059 PUSHMARK(SP);
79072805 3060 PUSHs(sv);
8aad04aa
JH		 3061#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3062 {
3063 struct sigaction oact;
3064
3065 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH		 3066 if (sip) {
3067 HV *sih = newHV();
ad64d0ec 3068 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH		 3069 /* The siginfo fields signo, code, errno, pid, uid,
3070 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC		 3071 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3072 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3073#if 0 /* XXX TODO: Configure scan for the existence of these, but even that does not help if the SA_SIGINFO is not implemented according to the spec. */
85771703
NC		 3074 hv_stores(sih, "errno", newSViv(sip->si_errno));
3075 hv_stores(sih, "status", newSViv(sip->si_status));
3076 hv_stores(sih, "uid", newSViv(sip->si_uid));
3077 hv_stores(sih, "pid", newSViv(sip->si_pid));
3078 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3079 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3080#endif
8aad04aa 3081 EXTEND(SP, 2);
ad64d0ec 3082 PUSHs(rv);
22f1178f 3083 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3084 }
b4552a27 3085
8aad04aa
JH		 3086 }
3087 }
3088#endif
79072805 3089 PUTBACK;
a0d0e21e 3090
ad64d0ec 3091 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3092
d3acc0f7 3093 POPSTACK;
1b266415 3094 if (SvTRUE(ERRSV)) {
1d615522 3095#ifndef PERL_MICRO
983dbef6 3096#ifdef HAS_SIGPROCMASK
1b266415
NIS		 3097 /* Handler "died", for example to get out of a restart-able read().
3098 * Before we re-do that on its behalf re-enable the signal which was
3099 * blocked by the system when we entered.
3100 */
3101 sigset_t set;
3102 sigemptyset(&set);
3103 sigaddset(&set,sig);
3104 sigprocmask(SIG_UNBLOCK, &set, NULL);
3105#else
3106 /* Not clear if this will work */
3107 (void)rsignal(sig, SIG_IGN);
5c1546dc 3108 (void)rsignal(sig, PL_csighandlerp);
1b266415 3109#endif
1d615522 3110#endif /* !PERL_MICRO */
c5df3096 3111 die_sv(ERRSV);
1b266415 3112 }
00d579c5 3113cleanup:
0c4d3b5e
DM		 3114 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3115 PL_savestack_ix = old_ss_ix;
72048cfe 3116 if (flags & 2)
3280af22 3117 PL_markstack_ptr--;
72048cfe 3118 if (flags & 4)
3280af22 3119 PL_scopestack_ix -= 1;
72048cfe 3120 if (flags & 8)
84902520 3121 SvREFCNT_dec(sv);
533c011a 3122 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3123
3280af22
NIS		 3124 PL_Sv = tSv; /* Restore global temporaries. */
3125 PL_Xpv = tXpv;
53bb94e2 3126 return;
79072805 3127}
4e35701f
NIS		 3128
3129
51371543 3130static void
8772537c 3131S_restore_magic(pTHX_ const void *p)
51371543 3132{
97aff369 3133 dVAR;
8772537c
AL		 3134 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3135 SV* const sv = mgs->mgs_sv;
51371543
GS		 3136
3137 if (!sv)
3138 return;
3139
3140 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3141 {
f8c7b90f 3142#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC		 3143 /* While magic was saved (and off) sv_setsv may well have seen
3144 this SV as a prime candidate for COW. */
3145 if (SvIsCOW(sv))
e424a81e 3146 sv_force_normal_flags(sv, 0);
f9701176
NC		 3147#endif
3148
f9c6fee5
CS		 3149 if (mgs->mgs_readonly)
3150 SvREADONLY_on(sv);
3151 if (mgs->mgs_magical)
3152 SvFLAGS(sv) |= mgs->mgs_magical;
51371543
GS		 3153 else
3154 mg_magical(sv);
2b77b520
YST		 3155 if (SvGMAGICAL(sv)) {
3156 /* downgrade public flags to private,
3157 and discard any other private flags */
3158
10edeb5d
JH		 3159 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3160 if (pubflags) {
3161 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3162 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
2b77b520
YST		 3163 }
3164 }
51371543
GS		 3165 }
3166
3167 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3168
3169 /* If we're still on top of the stack, pop us off. (That condition
3170 * will be satisfied if restore_magic was called explicitly, but *not*
3171 * if it's being called via leave_scope.)
3172 * The reason for doing this is that otherwise, things like sv_2cv()
3173 * may leave alloc gunk on the savestack, and some code
3174 * (e.g. sighandler) doesn't expect that...
3175 */
3176 if (PL_savestack_ix == mgs->mgs_ss_ix)
3177 {
1be36ce0
NC		 3178 UV popval = SSPOPUV;
3179 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3180 PL_savestack_ix -= 2;
1be36ce0
NC		 3181 popval = SSPOPUV;
3182 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3183 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3184 }
8985fe98
DM		 3185 if (SvREFCNT(sv) == 1) {
3186 /* We hold the last reference to this SV, which implies that the
3187 SV was deleted as a side effect of the routines we called.
3188 So artificially keep it alive a bit longer.
3189 We avoid turning on the TEMP flag, which can cause the SV's
3190 buffer to get stolen (and maybe other stuff). */
3191 int was_temp = SvTEMP(sv);
3192 sv_2mortal(sv);
3193 if (!was_temp) {
3194 SvTEMP_off(sv);
3195 }
3196 SvOK_off(sv);
3197 }
3198 else
3199 SvREFCNT_dec(sv); /* undo the inc in S_save_magic() */
51371543
GS		 3200}
3201
0c4d3b5e
DM		 3202/* clean up the mess created by Perl_sighandler().
3203 * Note that this is only called during an exit in a signal handler;
3204 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
3205 * skipped over. This is why we don't need to fix up the markstack and
3206 * scopestack - they're going to be set to 0 anyway */
3207
51371543 3208static void
8772537c 3209S_unwind_handler_stack(pTHX_ const void *p)
51371543 3210{
27da23d5 3211 dVAR;
0c4d3b5e 3212 PERL_UNUSED_ARG(p);
7918f24d 3213
0c4d3b5e 3214 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3215}
1018e26f 3216
66610fdd 3217/*
b3ca2e83
NC		 3218=for apidoc magic_sethint
3219
3220Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC		 3221C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3222anything that would need a deep copy. Maybe we should warn if we find a
3223reference.
b3ca2e83
NC		 3224
3225=cut
3226*/
3227int
3228Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3229{
3230 dVAR;
ad64d0ec 3231 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3232 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3233
7918f24d
NC		 3234 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3235
e6e3e454
NC		 3236 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3237 an alternative leaf in there, with PL_compiling.cop_hints being used if
3238 it's NULL. If needed for threads, the alternative could lock a mutex,
3239 or take other more complex action. */
3240
5b9c0671
NC		 3241 /* Something changed in %^H, so it will need to be restored on scope exit.
3242 Doing this here saves a lot of doing it manually in perl code (and
3243 forgetting to do it, and consequent subtle errors. */
3244 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z		 3245 CopHINTHASH_set(&PL_compiling,
3246 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC		 3247 return 0;
3248}
3249
3250/*
f175cff5 3251=for apidoc magic_clearhint
b3ca2e83 3252
c28fe1ec
NC		 3253Triggered by a delete from %^H, records the key to
3254C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC		 3255
3256=cut
3257*/
3258int
3259Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3260{
3261 dVAR;
7918f24d
NC		 3262
3263 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL		 3264 PERL_UNUSED_ARG(sv);
3265
b3ca2e83
NC		 3266 assert(mg->mg_len == HEf_SVKEY);
3267
b3f24c00
MHM		 3268 PERL_UNUSED_ARG(sv);
3269
5b9c0671 3270 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z		 3271 CopHINTHASH_set(&PL_compiling,
3272 cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3273 MUTABLE_SV(mg->mg_ptr), 0, 0));
b3ca2e83
NC		 3274 return 0;
3275}
3276
3277/*
f747ebd6
Z		 3278=for apidoc magic_clearhints
3279
3280Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3281
3282=cut
3283*/
3284int
3285Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3286{
3287 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3288 PERL_UNUSED_ARG(sv);
3289 PERL_UNUSED_ARG(mg);
20439bc7
Z		 3290 cophh_free(CopHINTHASH_get(&PL_compiling));
3291 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
f747ebd6
Z		 3292 return 0;
3293}
3294
3295/*
66610fdd
RGS		 3296 * Local variables:
3297 * c-indentation-style: bsd
3298 * c-basic-offset: 4
3299 * indent-tabs-mode: t
3300 * End:
3301 *
37442d52
RGS		 3302 * ex: set ts=8 sts=4 sw=4 noet:
3303 */
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