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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
PP
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;
150b625d 87 bool mgs_bumped;
c07a80fd 88};
455ece5e 89/* MGS is typedef'ed to struct magic_state in perl.h */
76e3520e
GS
90
91STATIC void
8fb26106 92S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
c07a80fd 93{
97aff369 94 dVAR;
455ece5e 95 MGS* mgs;
150b625d 96 bool bumped = FALSE;
7918f24d
NC
97
98 PERL_ARGS_ASSERT_SAVE_MAGIC;
99
150b625d
DM
100 /* we shouldn't really be called here with RC==0, but it can sometimes
101 * happen via mg_clear() (which also shouldn't be called when RC==0,
102 * but it can happen). Handle this case gracefully(ish) by not RC++
103 * and thus avoiding the resultant double free */
104 if (SvREFCNT(sv) > 0) {
105 /* guard against sv getting freed midway through the mg clearing,
106 * by holding a private reference for the duration. */
107 SvREFCNT_inc_simple_void_NN(sv);
108 bumped = TRUE;
109 }
8985fe98 110
c07a80fd 111 assert(SvMAGICAL(sv));
d8b2590f
NC
112 /* Turning READONLY off for a copy-on-write scalar (including shared
113 hash keys) is a bad idea. */
765f542d 114 if (SvIsCOW(sv))
9a265e59 115 sv_force_normal_flags(sv, 0);
c07a80fd 116
8772537c 117 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
118
119 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 120 mgs->mgs_sv = sv;
f9c6fee5
CS
121 mgs->mgs_magical = SvMAGICAL(sv);
122 mgs->mgs_readonly = SvREADONLY(sv) != 0;
455ece5e 123 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
150b625d 124 mgs->mgs_bumped = bumped;
c07a80fd
PP
125
126 SvMAGICAL_off(sv);
127 SvREADONLY_off(sv);
085bde85
NC
128 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
129 /* No public flags are set, so promote any private flags to public. */
130 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
131 }
c07a80fd
PP
132}
133
954c1994
GS
134/*
135=for apidoc mg_magical
136
137Turns on the magical status of an SV. See C<sv_magic>.
138
139=cut
140*/
141
8990e307 142void
864dbfa3 143Perl_mg_magical(pTHX_ SV *sv)
8990e307 144{
e1ec3a88 145 const MAGIC* mg;
7918f24d 146 PERL_ARGS_ASSERT_MG_MAGICAL;
96a5add6 147 PERL_UNUSED_CONTEXT;
f9c6fee5
CS
148
149 SvMAGICAL_off(sv);
218787bd 150 if ((mg = SvMAGIC(sv))) {
218787bd
VP
151 do {
152 const MGVTBL* const vtbl = mg->mg_virtual;
153 if (vtbl) {
154 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
155 SvGMAGICAL_on(sv);
156 if (vtbl->svt_set)
157 SvSMAGICAL_on(sv);
158 if (vtbl->svt_clear)
159 SvRMAGICAL_on(sv);
160 }
161 } while ((mg = mg->mg_moremagic));
162 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
163 SvRMAGICAL_on(sv);
8990e307
LW
164 }
165}
166
954c1994
GS
167/*
168=for apidoc mg_get
169
170Do magic after a value is retrieved from the SV. See C<sv_magic>.
171
172=cut
173*/
174
79072805 175int
864dbfa3 176Perl_mg_get(pTHX_ SV *sv)
79072805 177{
97aff369 178 dVAR;
35a4481c 179 const I32 mgs_ix = SSNEW(sizeof(MGS));
f9c6fee5 180 bool have_new = 0;
ff76feab 181 MAGIC *newmg, *head, *cur, *mg;
6683b158 182
7918f24d
NC
183 PERL_ARGS_ASSERT_MG_GET;
184
455ece5e 185 save_magic(mgs_ix, sv);
463ee0b2 186
ff76feab
AMS
187 /* We must call svt_get(sv, mg) for each valid entry in the linked
188 list of magic. svt_get() may delete the current entry, add new
189 magic to the head of the list, or upgrade the SV. AMS 20010810 */
190
191 newmg = cur = head = mg = SvMAGIC(sv);
192 while (mg) {
35a4481c 193 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 194 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 195
2b260de0 196 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
16c91539 197 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 198
58f82c5c
DM
199 /* guard against magic having been deleted - eg FETCH calling
200 * untie */
f9c6fee5
CS
201 if (!SvMAGIC(sv)) {
202 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
58f82c5c 203 break;
f9c6fee5 204 }
b77f7d40 205
f9c6fee5 206 /* recalculate flags if this entry was deleted. */
ff76feab 207 if (mg->mg_flags & MGf_GSKIP)
f9c6fee5 208 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
a0d0e21e 209 }
ff76feab 210
f9c6fee5 211 mg = nextmg;
ff76feab 212
0723351e 213 if (have_new) {
ff76feab
AMS
214 /* Have we finished with the new entries we saw? Start again
215 where we left off (unless there are more new entries). */
216 if (mg == head) {
0723351e 217 have_new = 0;
ff76feab
AMS
218 mg = cur;
219 head = newmg;
220 }
221 }
222
223 /* Were any new entries added? */
0723351e
NC
224 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
225 have_new = 1;
ff76feab
AMS
226 cur = mg;
227 mg = newmg;
f9c6fee5 228 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
760ac839 229 }
79072805 230 }
463ee0b2 231
8772537c 232 restore_magic(INT2PTR(void *, (IV)mgs_ix));
79072805
LW
233 return 0;
234}
235
954c1994
GS
236/*
237=for apidoc mg_set
238
239Do magic after a value is assigned to the SV. See C<sv_magic>.
240
241=cut
242*/
243
79072805 244int
864dbfa3 245Perl_mg_set(pTHX_ SV *sv)
79072805 246{
97aff369 247 dVAR;
35a4481c 248 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 249 MAGIC* mg;
463ee0b2
LW
250 MAGIC* nextmg;
251
7918f24d
NC
252 PERL_ARGS_ASSERT_MG_SET;
253
455ece5e 254 save_magic(mgs_ix, sv);
463ee0b2
LW
255
256 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 257 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 258 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
259 if (mg->mg_flags & MGf_GSKIP) {
260 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
f9c6fee5 261 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
a0d0e21e 262 }
e0a73de4
NC
263 if (PL_localizing == 2
264 && (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type) || sv == DEFSV))
e7cbf6c6 265 continue;
2b260de0 266 if (vtbl && vtbl->svt_set)
16c91539 267 vtbl->svt_set(aTHX_ sv, mg);
79072805 268 }
463ee0b2 269
8772537c 270 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
271 return 0;
272}
273
954c1994
GS
274/*
275=for apidoc mg_length
276
277Report on the SV's length. See C<sv_magic>.
278
279=cut
280*/
281
79072805 282U32
864dbfa3 283Perl_mg_length(pTHX_ SV *sv)
79072805 284{
97aff369 285 dVAR;
79072805 286 MAGIC* mg;
463ee0b2 287 STRLEN len;
463ee0b2 288
7918f24d
NC
289 PERL_ARGS_ASSERT_MG_LENGTH;
290
79072805 291 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 292 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 293 if (vtbl && vtbl->svt_len) {
35a4481c 294 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 295 save_magic(mgs_ix, sv);
a0d0e21e 296 /* omit MGf_GSKIP -- not changed here */
16c91539 297 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 298 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
299 return len;
300 }
301 }
302
d0644529
NC
303 {
304 /* You can't know whether it's UTF-8 until you get the string again...
305 */
10516c54 306 const U8 *s = (U8*)SvPV_const(sv, len);
d0644529
NC
307
308 if (DO_UTF8(sv)) {
309 len = utf8_length(s, s + len);
310 }
5636d518 311 }
463ee0b2 312 return len;
79072805
LW
313}
314
8fb26106 315I32
864dbfa3 316Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
317{
318 MAGIC* mg;
ac27b0f5 319
7918f24d
NC
320 PERL_ARGS_ASSERT_MG_SIZE;
321
93965878 322 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 323 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 324 if (vtbl && vtbl->svt_len) {
35a4481c
AL
325 const I32 mgs_ix = SSNEW(sizeof(MGS));
326 I32 len;
455ece5e 327 save_magic(mgs_ix, sv);
93965878 328 /* omit MGf_GSKIP -- not changed here */
16c91539 329 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 330 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
331 return len;
332 }
333 }
334
335 switch(SvTYPE(sv)) {
336 case SVt_PVAV:
502c6561 337 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
338 case SVt_PVHV:
339 /* FIXME */
340 default:
cea2e8a9 341 Perl_croak(aTHX_ "Size magic not implemented");
93965878
NIS
342 break;
343 }
344 return 0;
345}
346
954c1994
GS
347/*
348=for apidoc mg_clear
349
350Clear something magical that the SV represents. See C<sv_magic>.
351
352=cut
353*/
354
79072805 355int
864dbfa3 356Perl_mg_clear(pTHX_ SV *sv)
79072805 357{
35a4481c 358 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 359 MAGIC* mg;
8ac77ac9 360 MAGIC *nextmg;
463ee0b2 361
7918f24d
NC
362 PERL_ARGS_ASSERT_MG_CLEAR;
363
455ece5e 364 save_magic(mgs_ix, sv);
463ee0b2 365
8ac77ac9 366 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 367 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 368 /* omit GSKIP -- never set here */
727405f8 369
8ac77ac9
NC
370 nextmg = mg->mg_moremagic; /* it may delete itself */
371
2b260de0 372 if (vtbl && vtbl->svt_clear)
16c91539 373 vtbl->svt_clear(aTHX_ sv, mg);
79072805 374 }
463ee0b2 375
8772537c 376 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
377 return 0;
378}
379
ed624ca8 380static MAGIC*
39de7f53
FR
381S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
382{
383 PERL_UNUSED_CONTEXT;
384
385 assert(flags <= 1);
386
387 if (sv) {
388 MAGIC *mg;
389
390 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
391 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
392 return mg;
393 }
394 }
395 }
396
397 return NULL;
398}
399
954c1994
GS
400/*
401=for apidoc mg_find
402
403Finds the magic pointer for type matching the SV. See C<sv_magic>.
404
405=cut
406*/
407
93a17b20 408MAGIC*
35a4481c 409Perl_mg_find(pTHX_ const SV *sv, int type)
93a17b20 410{
39de7f53
FR
411 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
412}
413
414/*
415=for apidoc mg_findext
416
417Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
418C<sv_magicext>.
419
420=cut
421*/
422
423MAGIC*
424Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
425{
426 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
93a17b20
LW
427}
428
954c1994
GS
429/*
430=for apidoc mg_copy
431
432Copies the magic from one SV to another. See C<sv_magic>.
433
434=cut
435*/
436
79072805 437int
864dbfa3 438Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 439{
463ee0b2 440 int count = 0;
79072805 441 MAGIC* mg;
7918f24d
NC
442
443 PERL_ARGS_ASSERT_MG_COPY;
444
463ee0b2 445 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 446 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 447 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 448 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 449 }
823a54a3
AL
450 else {
451 const char type = mg->mg_type;
1e73acc8 452 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
453 sv_magic(nsv,
454 (type == PERL_MAGIC_tied)
455 ? SvTIED_obj(sv, mg)
456 : (type == PERL_MAGIC_regdata && mg->mg_obj)
457 ? sv
458 : mg->mg_obj,
459 toLOWER(type), key, klen);
460 count++;
461 }
79072805 462 }
79072805 463 }
463ee0b2 464 return count;
79072805
LW
465}
466
954c1994 467/*
0cbee0a4
DM
468=for apidoc mg_localize
469
9711599e
CS
470Copy some of the magic from an existing SV to new localized version of that
471SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
472taint, pos).
473
af7df257 474If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS
475This typically means that assignment will soon follow (e.g. 'local $x = $y'),
476and that will handle the magic.
0cbee0a4
DM
477
478=cut
479*/
480
481void
af7df257 482Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4 483{
97aff369 484 dVAR;
0cbee0a4 485 MAGIC *mg;
7918f24d
NC
486
487 PERL_ARGS_ASSERT_MG_LOCALIZE;
488
658a9f31
JD
489 if (nsv == DEFSV)
490 return;
491
0cbee0a4 492 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 493 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 494 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 495 continue;
0cbee0a4 496
a5063e7c 497 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 498 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 499 else
0cbee0a4
DM
500 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
501 mg->mg_ptr, mg->mg_len);
a5063e7c 502
0cbee0a4 503 /* container types should remain read-only across localization */
b2b95e4c 504 if (!SvIsCOW(sv)) SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
505 }
506
507 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
508 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 509 if (setmagic) {
9711599e
CS
510 PL_localizing = 1;
511 SvSETMAGIC(nsv);
512 PL_localizing = 0;
513 }
0cbee0a4
DM
514 }
515}
516
d9088386
Z
517#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
518static void
519S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
520{
521 const MGVTBL* const vtbl = mg->mg_virtual;
522 if (vtbl && vtbl->svt_free)
523 vtbl->svt_free(aTHX_ sv, mg);
524 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
525 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
526 Safefree(mg->mg_ptr);
527 else if (mg->mg_len == HEf_SVKEY)
528 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
529 }
530 if (mg->mg_flags & MGf_REFCOUNTED)
531 SvREFCNT_dec(mg->mg_obj);
532 Safefree(mg);
533}
534
0cbee0a4 535/*
954c1994
GS
536=for apidoc mg_free
537
538Free any magic storage used by the SV. See C<sv_magic>.
539
540=cut
541*/
542
79072805 543int
864dbfa3 544Perl_mg_free(pTHX_ SV *sv)
79072805
LW
545{
546 MAGIC* mg;
547 MAGIC* moremagic;
7918f24d
NC
548
549 PERL_ARGS_ASSERT_MG_FREE;
550
79072805 551 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 552 moremagic = mg->mg_moremagic;
d9088386 553 mg_free_struct(sv, mg);
c826f41b 554 SvMAGIC_set(sv, moremagic);
79072805 555 }
b162af07 556 SvMAGIC_set(sv, NULL);
68f8932e 557 SvMAGICAL_off(sv);
79072805
LW
558 return 0;
559}
560
d9088386
Z
561/*
562=for apidoc Am|void|mg_free_type|SV *sv|int how
563
564Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
565
566=cut
567*/
568
569void
570Perl_mg_free_type(pTHX_ SV *sv, int how)
571{
572 MAGIC *mg, *prevmg, *moremg;
573 PERL_ARGS_ASSERT_MG_FREE_TYPE;
574 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
575 MAGIC *newhead;
576 moremg = mg->mg_moremagic;
577 if (mg->mg_type == how) {
578 /* temporarily move to the head of the magic chain, in case
579 custom free code relies on this historical aspect of mg_free */
580 if (prevmg) {
581 prevmg->mg_moremagic = moremg;
582 mg->mg_moremagic = SvMAGIC(sv);
583 SvMAGIC_set(sv, mg);
584 }
585 newhead = mg->mg_moremagic;
586 mg_free_struct(sv, mg);
587 SvMAGIC_set(sv, newhead);
588 mg = prevmg;
589 }
590 }
591 mg_magical(sv);
592}
593
79072805 594#include <signal.h>
79072805 595
942e002e 596U32
864dbfa3 597Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 598{
97aff369 599 dVAR;
8772537c 600 PERL_UNUSED_ARG(sv);
6cef1e77 601
7918f24d
NC
602 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
603
0bd48802
AL
604 if (PL_curpm) {
605 register const REGEXP * const rx = PM_GETRE(PL_curpm);
606 if (rx) {
a678b0e4
YO
607 if (mg->mg_obj) { /* @+ */
608 /* return the number possible */
07bc277f 609 return RX_NPARENS(rx);
a678b0e4 610 } else { /* @- */
07bc277f 611 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
612
613 /* return the last filled */
f46c4081 614 while ( paren >= 0
07bc277f
NC
615 && (RX_OFFS(rx)[paren].start == -1
616 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 617 paren--;
a678b0e4
YO
618 return (U32)paren;
619 }
0bd48802 620 }
8f580fb8 621 }
ac27b0f5 622
942e002e 623 return (U32)-1;
6cef1e77
IZ
624}
625
626int
864dbfa3 627Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 628{
97aff369 629 dVAR;
7918f24d
NC
630
631 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
632
0bd48802
AL
633 if (PL_curpm) {
634 register const REGEXP * const rx = PM_GETRE(PL_curpm);
635 if (rx) {
636 register const I32 paren = mg->mg_len;
637 register I32 s;
638 register I32 t;
639 if (paren < 0)
640 return 0;
07bc277f
NC
641 if (paren <= (I32)RX_NPARENS(rx) &&
642 (s = RX_OFFS(rx)[paren].start) != -1 &&
643 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802
AL
644 {
645 register I32 i;
646 if (mg->mg_obj) /* @+ */
647 i = t;
648 else /* @- */
649 i = s;
650
651 if (i > 0 && RX_MATCH_UTF8(rx)) {
07bc277f 652 const char * const b = RX_SUBBEG(rx);
0bd48802 653 if (b)
f5a63d97 654 i = utf8_length((U8*)b, (U8*)(b+i));
0bd48802 655 }
727405f8 656
0bd48802 657 sv_setiv(sv, i);
1aa99e6b 658 }
0bd48802 659 }
6cef1e77
IZ
660 }
661 return 0;
662}
663
e4b89193 664int
a29d06ed
MG
665Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
666{
7918f24d 667 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
d4c19fe8
AL
668 PERL_UNUSED_ARG(sv);
669 PERL_UNUSED_ARG(mg);
6ad8f254 670 Perl_croak_no_modify(aTHX);
0dbb1585 671 NORETURN_FUNCTION_END;
a29d06ed
MG
672}
673
93a17b20 674U32
864dbfa3 675Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
93a17b20 676{
97aff369 677 dVAR;
93a17b20 678 register I32 paren;
93a17b20 679 register I32 i;
2fdbfb4d
AB
680 register const REGEXP * rx;
681 const char * const remaining = mg->mg_ptr + 1;
93a17b20 682
7918f24d
NC
683 PERL_ARGS_ASSERT_MAGIC_LEN;
684
93a17b20 685 switch (*mg->mg_ptr) {
2fdbfb4d
AB
686 case '\020':
687 if (*remaining == '\0') { /* ^P */
688 break;
689 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
690 goto do_prematch;
691 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
692 goto do_postmatch;
693 }
694 break;
695 case '\015': /* $^MATCH */
696 if (strEQ(remaining, "ATCH")) {
697 goto do_match;
698 } else {
699 break;
700 }
701 case '`':
702 do_prematch:
f1b875a0 703 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB
704 goto maybegetparen;
705 case '\'':
706 do_postmatch:
f1b875a0 707 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB
708 goto maybegetparen;
709 case '&':
710 do_match:
f1b875a0 711 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d 712 goto maybegetparen;
93a17b20 713 case '1': case '2': case '3': case '4':
2fdbfb4d
AB
714 case '5': case '6': case '7': case '8': case '9':
715 paren = atoi(mg->mg_ptr);
716 maybegetparen:
aaa362c4 717 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d
AB
718 getparen:
719 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
cf93c79d 720
ffc61ed2 721 if (i < 0)
0844c848 722 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
ffc61ed2 723 return i;
2fdbfb4d 724 } else {
235bddc8 725 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 726 report_uninit(sv);
2fdbfb4d 727 return 0;
93a17b20 728 }
93a17b20 729 case '+':
aaa362c4 730 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f 731 paren = RX_LASTPAREN(rx);
13f57bf8
CS
732 if (paren)
733 goto getparen;
93a17b20 734 }
748a9306 735 return 0;
a01268b5
JH
736 case '\016': /* ^N */
737 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f 738 paren = RX_LASTCLOSEPAREN(rx);
a01268b5
JH
739 if (paren)
740 goto getparen;
741 }
742 return 0;
93a17b20
LW
743 }
744 magic_get(sv,mg);
2d8e6c8d 745 if (!SvPOK(sv) && SvNIOK(sv)) {
8b6b16e7 746 sv_2pv(sv, 0);
2d8e6c8d 747 }
93a17b20
LW
748 if (SvPOK(sv))
749 return SvCUR(sv);
750 return 0;
751}
752
ad3296c6 753#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
754 if (SvPOK(sv)) { \
755 STRLEN len = SvCUR(sv); \
756 char * const p = SvPVX(sv); \
8e6b4db6
PC
757 while (len > 0 && isSPACE(p[len-1])) \
758 --len; \
759 SvCUR_set(sv, len); \
760 p[len] = '\0'; \
761 } \
ad3296c6
SH
762} STMT_END
763
8b850bd5
NC
764void
765Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
766{
7918f24d
NC
767 PERL_ARGS_ASSERT_EMULATE_COP_IO;
768
8b850bd5
NC
769 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
770 sv_setsv(sv, &PL_sv_undef);
771 else {
772 sv_setpvs(sv, "");
773 SvUTF8_off(sv);
774 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 775 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
776 assert(value);
777 sv_catsv(sv, value);
778 }
779 sv_catpvs(sv, "\0");
780 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 781 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
782 assert(value);
783 sv_catsv(sv, value);
784 }
785 }
786}
787
79072805 788int
864dbfa3 789Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 790{
27da23d5 791 dVAR;
79072805 792 register I32 paren;
db7198b5 793 register const char *s = NULL;
d9f97599 794 register REGEXP *rx;
823a54a3
AL
795 const char * const remaining = mg->mg_ptr + 1;
796 const char nextchar = *remaining;
79072805 797
7918f24d
NC
798 PERL_ARGS_ASSERT_MAGIC_GET;
799
79072805 800 switch (*mg->mg_ptr) {
748a9306 801 case '\001': /* ^A */
3280af22 802 sv_setsv(sv, PL_bodytarget);
125b9982
NT
803 if (SvTAINTED(PL_bodytarget))
804 SvTAINTED_on(sv);
748a9306 805 break;
e5218da5 806 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 807 if (nextchar == '\0') {
e5218da5
GA
808 sv_setiv(sv, (IV)PL_minus_c);
809 }
823a54a3 810 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
811 sv_setiv(sv, (IV)STATUS_NATIVE);
812 }
49460fe6
NIS
813 break;
814
79072805 815 case '\004': /* ^D */
aea4f609 816 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 817 break;
28f23441 818 case '\005': /* ^E */
823a54a3 819 if (nextchar == '\0') {
e37778c2 820#if defined(VMS)
0a378802
JH
821 {
822# include <descrip.h>
823# include <starlet.h>
824 char msg[255];
825 $DESCRIPTOR(msgdsc,msg);
826 sv_setnv(sv,(NV) vaxc$errno);
827 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
828 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
829 else
76f68e9b 830 sv_setpvs(sv,"");
0a378802 831 }
4b645107 832#elif defined(OS2)
0a378802
JH
833 if (!(_emx_env & 0x200)) { /* Under DOS */
834 sv_setnv(sv, (NV)errno);
835 sv_setpv(sv, errno ? Strerror(errno) : "");
836 } else {
837 if (errno != errno_isOS2) {
823a54a3 838 const int tmp = _syserrno();
0a378802
JH
839 if (tmp) /* 2nd call to _syserrno() makes it 0 */
840 Perl_rc = tmp;
841 }
842 sv_setnv(sv, (NV)Perl_rc);
843 sv_setpv(sv, os2error(Perl_rc));
844 }
4b645107 845#elif defined(WIN32)
0a378802 846 {
d4c19fe8 847 const DWORD dwErr = GetLastError();
0a378802 848 sv_setnv(sv, (NV)dwErr);
823a54a3 849 if (dwErr) {
0a378802
JH
850 PerlProc_GetOSError(sv, dwErr);
851 }
852 else
76f68e9b 853 sv_setpvs(sv, "");
0a378802
JH
854 SetLastError(dwErr);
855 }
22fae026 856#else
f6c8f21d 857 {
4ee39169 858 dSAVE_ERRNO;
f6c8f21d 859 sv_setnv(sv, (NV)errno);
666ea192 860 sv_setpv(sv, errno ? Strerror(errno) : "");
4ee39169 861 RESTORE_ERRNO;
f6c8f21d 862 }
28f23441 863#endif
ad3296c6 864 SvRTRIM(sv);
0a378802
JH
865 SvNOK_on(sv); /* what a wonderful hack! */
866 }
823a54a3 867 else if (strEQ(remaining, "NCODING"))
0a378802
JH
868 sv_setsv(sv, PL_encoding);
869 break;
79072805 870 case '\006': /* ^F */
3280af22 871 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 872 break;
9ebf26ad
FR
873 case '\007': /* ^GLOBAL_PHASE */
874 if (strEQ(remaining, "LOBAL_PHASE")) {
875 sv_setpvn(sv, PL_phase_names[PL_phase],
876 strlen(PL_phase_names[PL_phase]));
877 }
878 break;
a0d0e21e 879 case '\010': /* ^H */
3280af22 880 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 881 break;
9d116dd7 882 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 883 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 884 break;
ac27b0f5 885 case '\017': /* ^O & ^OPEN */
823a54a3 886 if (nextchar == '\0') {
ac27b0f5 887 sv_setpv(sv, PL_osname);
3511154c
DM
888 SvTAINTED_off(sv);
889 }
823a54a3 890 else if (strEQ(remaining, "PEN")) {
8b850bd5 891 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 892 }
28f23441 893 break;
9ebf26ad 894 case '\020':
cde0cee5
YO
895 if (nextchar == '\0') { /* ^P */
896 sv_setiv(sv, (IV)PL_perldb);
897 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
898 goto do_prematch_fetch;
899 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
900 goto do_postmatch_fetch;
901 }
79072805 902 break;
fb73857a 903 case '\023': /* ^S */
823a54a3 904 if (nextchar == '\0') {
bc177e6b 905 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 906 SvOK_off(sv);
3280af22 907 else if (PL_in_eval)
6dc8a9e4 908 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
909 else
910 sv_setiv(sv, 0);
d58bf5aa 911 }
fb73857a 912 break;
79072805 913 case '\024': /* ^T */
823a54a3 914 if (nextchar == '\0') {
88e89b8a 915#ifdef BIG_TIME
7c36658b 916 sv_setnv(sv, PL_basetime);
88e89b8a 917#else
7c36658b 918 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 919#endif
7c36658b 920 }
823a54a3 921 else if (strEQ(remaining, "AINT"))
9aa05f58
RGS
922 sv_setiv(sv, PL_tainting
923 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
924 : 0);
7c36658b 925 break;
e07ea26a 926 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 927 if (strEQ(remaining, "NICODE"))
a05d7ebb 928 sv_setuv(sv, (UV) PL_unicode);
823a54a3 929 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 930 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
931 else if (strEQ(remaining, "TF8CACHE"))
932 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
933 break;
934 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 935 if (nextchar == '\0')
4438c4b7 936 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 937 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 938 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 939 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
940 }
941 else if (PL_compiling.cop_warnings == pWARN_STD) {
666ea192
JH
942 sv_setpvn(
943 sv,
944 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
945 WARNsize
946 );
013b78e8 947 }
d3a7d8c7 948 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
949 /* Get the bit mask for $warnings::Bits{all}, because
950 * it could have been extended by warnings::register */
6673a63c 951 HV * const bits=get_hv("warnings::Bits", 0);
f5a63d97
AL
952 if (bits) {
953 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
954 if (bits_all)
955 sv_setsv(sv, *bits_all);
75b6c4ca
RGS
956 }
957 else {
958 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
959 }
ac27b0f5 960 }
4438c4b7 961 else {
72dc9ed5
NC
962 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
963 *PL_compiling.cop_warnings);
ac27b0f5 964 }
d3a7d8c7 965 SvPOK_only(sv);
4438c4b7 966 }
79072805 967 break;
cde0cee5
YO
968 case '\015': /* $^MATCH */
969 if (strEQ(remaining, "ATCH")) {
79072805
LW
970 case '1': case '2': case '3': case '4':
971 case '5': case '6': case '7': case '8': case '9': case '&':
cde0cee5
YO
972 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
973 /*
159b6efe 974 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
cde0cee5
YO
975 * XXX Does the new way break anything?
976 */
977 paren = atoi(mg->mg_ptr); /* $& is in [0] */
2fdbfb4d 978 CALLREG_NUMBUF_FETCH(rx,paren,sv);
cde0cee5
YO
979 break;
980 }
981 sv_setsv(sv,&PL_sv_undef);
79072805
LW
982 }
983 break;
984 case '+':
aaa362c4 985 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f
NC
986 if (RX_LASTPAREN(rx)) {
987 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
44a2ac75
YO
988 break;
989 }
79072805 990 }
3280af22 991 sv_setsv(sv,&PL_sv_undef);
79072805 992 break;
a01268b5
JH
993 case '\016': /* ^N */
994 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f
NC
995 if (RX_LASTCLOSEPAREN(rx)) {
996 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
44a2ac75
YO
997 break;
998 }
999
a01268b5
JH
1000 }
1001 sv_setsv(sv,&PL_sv_undef);
1002 break;
79072805 1003 case '`':
cde0cee5 1004 do_prematch_fetch:
aaa362c4 1005 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d 1006 CALLREG_NUMBUF_FETCH(rx,-2,sv);
93b32b6d 1007 break;
79072805 1008 }
3280af22 1009 sv_setsv(sv,&PL_sv_undef);
79072805
LW
1010 break;
1011 case '\'':
cde0cee5 1012 do_postmatch_fetch:
aaa362c4 1013 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d 1014 CALLREG_NUMBUF_FETCH(rx,-1,sv);
93b32b6d 1015 break;
79072805 1016 }
3280af22 1017 sv_setsv(sv,&PL_sv_undef);
79072805
LW
1018 break;
1019 case '.':
3280af22 1020 if (GvIO(PL_last_in_gv)) {
357c8808 1021 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1022 }
79072805
LW
1023 break;
1024 case '?':
809a5acc 1025 {
809a5acc 1026 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1027#ifdef COMPLEX_STATUS
41cb7b2b 1028 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1029 LvTARGOFF(sv) = PL_statusvalue;
1030 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1031#endif
809a5acc 1032 }
79072805
LW
1033 break;
1034 case '^':
099be4f1
DM
1035 if (!isGV_with_GP(PL_defoutgv))
1036 s = "";
1037 else if (GvIOp(PL_defoutgv))
1038 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1039 if (s)
1040 sv_setpv(sv,s);
1041 else {
3280af22 1042 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1043 sv_catpvs(sv,"_TOP");
79072805
LW
1044 }
1045 break;
1046 case '~':
099be4f1
DM
1047 if (!isGV_with_GP(PL_defoutgv))
1048 s = "";
1049 else if (GvIOp(PL_defoutgv))
0daa599b 1050 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1051 if (!s)
3280af22 1052 s = GvENAME(PL_defoutgv);
79072805
LW
1053 sv_setpv(sv,s);
1054 break;
79072805 1055 case '=':
099be4f1 1056 if (GvIO(PL_defoutgv))
0daa599b 1057 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1058 break;
1059 case '-':
099be4f1 1060 if (GvIO(PL_defoutgv))
0daa599b 1061 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1062 break;
1063 case '%':
099be4f1 1064 if (GvIO(PL_defoutgv))
0daa599b 1065 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1066 break;
79072805
LW
1067 case ':':
1068 break;
1069 case '/':
1070 break;
1071 case '[':
11206fdd 1072 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
79072805
LW
1073 break;
1074 case '|':
099be4f1 1075 if (GvIO(PL_defoutgv))
0daa599b 1076 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1077 break;
79072805 1078 case '\\':
b2ce0fda 1079 if (PL_ors_sv)
f28098ff 1080 sv_copypv(sv, PL_ors_sv);
79072805 1081 break;
0e219455 1082 case '$': /* $$ */
9cdac2a2
FC
1083 {
1084 IV const pid = (IV)PerlProc_getpid();
1085 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid)
1086 /* never set manually, or at least not since last fork */
1087 sv_setiv(sv, pid);
1088 /* else a value has been assigned manually, so do nothing */
1089 }
0e219455
MM
1090 break;
1091
79072805 1092 case '!':
666d8aa2
CB
1093 {
1094 dSAVE_ERRNO;
a5f75d66 1095#ifdef VMS
65202027 1096 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
a5f75d66 1097#else
65202027 1098 sv_setnv(sv, (NV)errno);
666d8aa2 1099#endif
88e89b8a 1100#ifdef OS2
ed344e4f
IZ
1101 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1102 sv_setpv(sv, os2error(Perl_rc));
88e89b8a 1103 else
a5f75d66 1104#endif
666ea192 1105 sv_setpv(sv, errno ? Strerror(errno) : "");
be1cf43c
NC
1106 if (SvPOKp(sv))
1107 SvPOK_on(sv); /* may have got removed during taint processing */
4ee39169 1108 RESTORE_ERRNO;
88e89b8a 1109 }
666d8aa2 1110
ad3296c6 1111 SvRTRIM(sv);
946ec16e 1112 SvNOK_on(sv); /* what a wonderful hack! */
79072805
LW
1113 break;
1114 case '<':
3280af22 1115 sv_setiv(sv, (IV)PL_uid);
79072805
LW
1116 break;
1117 case '>':
3280af22 1118 sv_setiv(sv, (IV)PL_euid);
79072805
LW
1119 break;
1120 case '(':
3280af22 1121 sv_setiv(sv, (IV)PL_gid);
79072805
LW
1122 goto add_groups;
1123 case ')':
3280af22 1124 sv_setiv(sv, (IV)PL_egid);
79072805 1125 add_groups:
79072805 1126#ifdef HAS_GETGROUPS
79072805 1127 {
57d7c65e 1128 Groups_t *gary = NULL;
fb45abb2 1129 I32 i, num_groups = getgroups(0, gary);
57d7c65e
JC
1130 Newx(gary, num_groups, Groups_t);
1131 num_groups = getgroups(num_groups, gary);
fb45abb2
GA
1132 for (i = 0; i < num_groups; i++)
1133 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
57d7c65e 1134 Safefree(gary);
79072805 1135 }
155aba94 1136 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1137#endif
79072805 1138 break;
79072805
LW
1139 case '0':
1140 break;
1141 }
a0d0e21e 1142 return 0;
79072805
LW
1143}
1144
1145int
864dbfa3 1146Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1147{
8772537c 1148 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1149
7918f24d
NC
1150 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1151
79072805 1152 if (uf && uf->uf_val)
24f81a43 1153 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1154 return 0;
1155}
1156
1157int
864dbfa3 1158Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1159{
27da23d5 1160 dVAR;
9ae3433d 1161 STRLEN len = 0, klen;
666ea192 1162 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
fabdb6c0 1163 const char * const ptr = MgPV_const(mg,klen);
88e89b8a 1164 my_setenv(ptr, s);
1e422769 1165
7918f24d
NC
1166 PERL_ARGS_ASSERT_MAGIC_SETENV;
1167
a0d0e21e
LW
1168#ifdef DYNAMIC_ENV_FETCH
1169 /* We just undefd an environment var. Is a replacement */
1170 /* waiting in the wings? */
1171 if (!len) {
fabdb6c0
AL
1172 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1173 if (valp)
4ab59fcc 1174 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1175 }
1176#endif
1e422769 1177
39e571d4 1178#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1179 /* And you'll never guess what the dog had */
1180 /* in its mouth... */
3280af22 1181 if (PL_tainting) {
1e422769
PP
1182 MgTAINTEDDIR_off(mg);
1183#ifdef VMS
5aabfad6 1184 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
b8ffc8df 1185 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1186 int i = 0, j = 0;
1187
6fca0082 1188 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1189 elt = eltbuf;
1e422769
PP
1190 do { /* DCL$PATH may be a search list */
1191 while (1) { /* as may dev portion of any element */
1192 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1193 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1194 cando_by_name(S_IWUSR,0,elt) ) {
1195 MgTAINTEDDIR_on(mg);
1196 return 0;
1197 }
1198 }
bd61b366 1199 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1200 *cp = '\0';
1201 if (my_trnlnm(elt, eltbuf, j++))
1202 elt = eltbuf;
1203 else
1204 break;
1205 }
1206 j = 0;
1207 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1208 }
1209#endif /* VMS */
5aabfad6 1210 if (s && klen == 4 && strEQ(ptr,"PATH")) {
8772537c 1211 const char * const strend = s + len;
463ee0b2
LW
1212
1213 while (s < strend) {
96827780 1214 char tmpbuf[256];
c623ac67 1215 Stat_t st;
5f74f29c 1216 I32 i;
f5a63d97
AL
1217#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1218 const char path_sep = '|';
1219#else
1220 const char path_sep = ':';
1221#endif
96827780 1222 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1223 s, strend, path_sep, &i);
463ee0b2 1224 s++;
bb7a0f54 1225 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB
1226#ifdef VMS
1227 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1228#else
1229 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1230#endif
c6ed36e1 1231 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1232 MgTAINTEDDIR_on(mg);
1e422769
PP
1233 return 0;
1234 }
463ee0b2 1235 }
79072805
LW
1236 }
1237 }
39e571d4 1238#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1239
79072805
LW
1240 return 0;
1241}
1242
1243int
864dbfa3 1244Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1245{
7918f24d 1246 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1247 PERL_UNUSED_ARG(sv);
bd61b366 1248 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1249 return 0;
1250}
1251
88e89b8a 1252int
864dbfa3 1253Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1254{
97aff369 1255 dVAR;
7918f24d 1256 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1257 PERL_UNUSED_ARG(mg);
b0269e46 1258#if defined(VMS)
cea2e8a9 1259 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1260#else
3280af22 1261 if (PL_localizing) {
fb73857a 1262 HE* entry;
b0269e46 1263 my_clearenv();
85fbaab2
NC
1264 hv_iterinit(MUTABLE_HV(sv));
1265 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1266 I32 keylen;
1267 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1268 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1269 }
1270 }
1271#endif
1272 return 0;
1273}
1274
1275int
864dbfa3 1276Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1277{
27da23d5 1278 dVAR;
7918f24d 1279 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1280 PERL_UNUSED_ARG(sv);
1281 PERL_UNUSED_ARG(mg);
b0269e46
AB
1282#if defined(VMS)
1283 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1284#else
1285 my_clearenv();
1286#endif
3e3baf6d 1287 return 0;
66b1d557
HM
1288}
1289
64ca3a65 1290#ifndef PERL_MICRO
2d4fcd5e
AJ
1291#ifdef HAS_SIGPROCMASK
1292static void
1293restore_sigmask(pTHX_ SV *save_sv)
1294{
0bd48802 1295 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1296 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1297}
1298#endif
66b1d557 1299int
864dbfa3 1300Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1301{
97aff369 1302 dVAR;
88e89b8a 1303 /* Are we fetching a signal entry? */
708854f2 1304 int i = (I16)mg->mg_private;
7918f24d
NC
1305
1306 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1307
708854f2
NC
1308 if (!i) {
1309 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1310 }
1311
e02bfb16 1312 if (i > 0) {
22c35a8c
GS
1313 if(PL_psig_ptr[i])
1314 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1315 else {
46da273f 1316 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1317#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1318 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1319 sigstate = SIG_IGN;
2e34cc90
CL
1320#endif
1321#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1322 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1323 sigstate = SIG_DFL;
85b332e2 1324#endif
88e89b8a 1325 /* cache state so we don't fetch it again */
8aad04aa 1326 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1327 sv_setpvs(sv,"IGNORE");
88e89b8a 1328 else
3280af22 1329 sv_setsv(sv,&PL_sv_undef);
46da273f 1330 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1331 SvTEMP_off(sv);
1332 }
1333 }
1334 return 0;
1335}
1336int
864dbfa3 1337Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1338{
7918f24d 1339 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1340
38a124f0 1341 magic_setsig(NULL, mg);
179c85a2 1342 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1343}
3d37d572 1344
0a8e0eff 1345Signal_t
8aad04aa 1346#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1347Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1348#else
0a8e0eff 1349Perl_csighandler(int sig)
8aad04aa 1350#endif
0a8e0eff 1351{
1018e26f
NIS
1352#ifdef PERL_GET_SIG_CONTEXT
1353 dTHXa(PERL_GET_SIG_CONTEXT);
1354#else
85b332e2
CL
1355 dTHX;
1356#endif
23ada85b 1357#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1358 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1359 if (PL_sig_ignoring[sig]) return;
85b332e2 1360#endif
2e34cc90 1361#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1362 if (PL_sig_defaulting[sig])
2e34cc90
CL
1363#ifdef KILL_BY_SIGPRC
1364 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1365#else
1366 exit(1);
1367#endif
1368#endif
406878dd 1369 if (
853d2c32
RGS
1370#ifdef SIGILL
1371 sig == SIGILL ||
1372#endif
1373#ifdef SIGBUS
1374 sig == SIGBUS ||
1375#endif
1376#ifdef SIGSEGV
1377 sig == SIGSEGV ||
1378#endif
1379 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1380 /* Call the perl level handler now--
31c91b43 1381 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1382#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1383 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1384#else
1385 (*PL_sighandlerp)(sig);
92807b6d 1386#endif
406878dd 1387 else {
31c91b43 1388 if (!PL_psig_pend) return;
406878dd
GA
1389 /* Set a flag to say this signal is pending, that is awaiting delivery after
1390 * the current Perl opcode completes */
1391 PL_psig_pend[sig]++;
1392
1393#ifndef SIG_PENDING_DIE_COUNT
1394# define SIG_PENDING_DIE_COUNT 120
1395#endif
fe13d51d 1396 /* Add one to say _a_ signal is pending */
406878dd
GA
1397 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1398 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1399 (unsigned long)SIG_PENDING_DIE_COUNT);
1400 }
0a8e0eff
NIS
1401}
1402
2e34cc90
CL
1403#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1404void
1405Perl_csighandler_init(void)
1406{
1407 int sig;
27da23d5 1408 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1409
1410 for (sig = 1; sig < SIG_SIZE; sig++) {
1411#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1412 dTHX;
27da23d5 1413 PL_sig_defaulting[sig] = 1;
5c1546dc 1414 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1415#endif
1416#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1417 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1418#endif
1419 }
27da23d5 1420 PL_sig_handlers_initted = 1;
2e34cc90
CL
1421}
1422#endif
1423
7fe50b8b
LT
1424#if defined HAS_SIGPROCMASK
1425static void
1426unblock_sigmask(pTHX_ void* newset)
1427{
1428 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1429}
1430#endif
1431
0a8e0eff
NIS
1432void
1433Perl_despatch_signals(pTHX)
1434{
97aff369 1435 dVAR;
0a8e0eff
NIS
1436 int sig;
1437 PL_sig_pending = 0;
1438 for (sig = 1; sig < SIG_SIZE; sig++) {
1439 if (PL_psig_pend[sig]) {
d0166017 1440 dSAVE_ERRNO;
7fe50b8b 1441#ifdef HAS_SIGPROCMASK
55534442
LT
1442 /* From sigaction(2) (FreeBSD man page):
1443 * | Signal routines normally execute with the signal that
1444 * | caused their invocation blocked, but other signals may
1445 * | yet occur.
1446 * Emulation of this behavior (from within Perl) is enabled
1447 * using sigprocmask
1448 */
1449 int was_blocked;
1450 sigset_t newset, oldset;
1451
1452 sigemptyset(&newset);
1453 sigaddset(&newset, sig);
1454 sigprocmask(SIG_BLOCK, &newset, &oldset);
1455 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1456 if (!was_blocked) {
1457 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1458 ENTER;
1459 SAVEFREESV(save_sv);
1460 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1461 }
55534442 1462#endif
25da4428 1463 PL_psig_pend[sig] = 0;
6e324d09 1464#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1465 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1466#else
1467 (*PL_sighandlerp)(sig);
92807b6d 1468#endif
7fe50b8b 1469#ifdef HAS_SIGPROCMASK
55534442 1470 if (!was_blocked)
7fe50b8b 1471 LEAVE;
55534442 1472#endif
d0166017 1473 RESTORE_ERRNO;
0a8e0eff
NIS
1474 }
1475 }
1476}
1477
38a124f0 1478/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1479int
864dbfa3 1480Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1481{
27da23d5 1482 dVAR;
79072805 1483 I32 i;
cbbf8932 1484 SV** svp = NULL;
2d4fcd5e
AJ
1485 /* Need to be careful with SvREFCNT_dec(), because that can have side
1486 * effects (due to closures). We must make sure that the new disposition
1487 * is in place before it is called.
1488 */
cbbf8932 1489 SV* to_dec = NULL;
e72dc28c 1490 STRLEN len;
2d4fcd5e
AJ
1491#ifdef HAS_SIGPROCMASK
1492 sigset_t set, save;
1493 SV* save_sv;
1494#endif
d5263905 1495 register const char *s = MgPV_const(mg,len);
7918f24d
NC
1496
1497 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1498
748a9306
LW
1499 if (*s == '_') {
1500 if (strEQ(s,"__DIE__"))
3280af22 1501 svp = &PL_diehook;
38a124f0
NC
1502 else if (strEQ(s,"__WARN__")
1503 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1504 /* Merge the existing behaviours, which are as follows:
1505 magic_setsig, we always set svp to &PL_warnhook
1506 (hence we always change the warnings handler)
1507 For magic_clearsig, we don't change the warnings handler if it's
1508 set to the &PL_warnhook. */
3280af22 1509 svp = &PL_warnhook;
38a124f0 1510 } else if (sv)
cea2e8a9 1511 Perl_croak(aTHX_ "No such hook: %s", s);
748a9306 1512 i = 0;
38a124f0 1513 if (svp && *svp) {
9289f461
RGS
1514 if (*svp != PERL_WARNHOOK_FATAL)
1515 to_dec = *svp;
cbbf8932 1516 *svp = NULL;
4633a7c4 1517 }
748a9306
LW
1518 }
1519 else {
708854f2
NC
1520 i = (I16)mg->mg_private;
1521 if (!i) {
58a26b12
NC
1522 i = whichsig(s); /* ...no, a brick */
1523 mg->mg_private = (U16)i;
708854f2 1524 }
86d86cad 1525 if (i <= 0) {
a2a5de95
NC
1526 if (sv)
1527 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
748a9306
LW
1528 return 0;
1529 }
2d4fcd5e
AJ
1530#ifdef HAS_SIGPROCMASK
1531 /* Avoid having the signal arrive at a bad time, if possible. */
1532 sigemptyset(&set);
1533 sigaddset(&set,i);
1534 sigprocmask(SIG_BLOCK, &set, &save);
1535 ENTER;
9ff8e806 1536 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1537 SAVEFREESV(save_sv);
1538 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1539#endif
1540 PERL_ASYNC_CHECK();
2e34cc90 1541#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1542 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1543#endif
23ada85b 1544#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1545 PL_sig_ignoring[i] = 0;
85b332e2 1546#endif
2e34cc90 1547#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1548 PL_sig_defaulting[i] = 0;
2e34cc90 1549#endif
2d4fcd5e 1550 to_dec = PL_psig_ptr[i];
38a124f0
NC
1551 if (sv) {
1552 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1553 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1554
1555 /* Signals don't change name during the program's execution, so once
1556 they're cached in the appropriate slot of PL_psig_name, they can
1557 stay there.
1558
1559 Ideally we'd find some way of making SVs at (C) compile time, or
1560 at least, doing most of the work. */
1561 if (!PL_psig_name[i]) {
1562 PL_psig_name[i] = newSVpvn(s, len);
1563 SvREADONLY_on(PL_psig_name[i]);
1564 }
38a124f0 1565 } else {
79fd3822 1566 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1567 PL_psig_name[i] = NULL;
1568 PL_psig_ptr[i] = NULL;
1569 }
748a9306 1570 }
38a124f0 1571 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1572 if (i) {
5c1546dc 1573 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1574 }
748a9306 1575 else
b37c2d43 1576 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1577 } else {
9dfa190b
NC
1578 if (sv && SvOK(sv)) {
1579 s = SvPV_force(sv, len);
1580 } else {
1581 sv = NULL;
1582 }
1583 if (sv && strEQ(s,"IGNORE")) {
1584 if (i) {
23ada85b 1585#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1586 PL_sig_ignoring[i] = 1;
1587 (void)rsignal(i, PL_csighandlerp);
85b332e2 1588#else
9dfa190b 1589 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1590#endif
9dfa190b 1591 }
2d4fcd5e 1592 }
9dfa190b
NC
1593 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1594 if (i) {
2e34cc90 1595#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1596 PL_sig_defaulting[i] = 1;
1597 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1598#else
9dfa190b 1599 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1600#endif
9dfa190b
NC
1601 }
1602 }
1603 else {
1604 /*
1605 * We should warn if HINT_STRICT_REFS, but without
1606 * access to a known hint bit in a known OP, we can't
1607 * tell whether HINT_STRICT_REFS is in force or not.
1608 */
1609 if (!strchr(s,':') && !strchr(s,'\''))
1610 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1611 SV_GMAGIC);
1612 if (i)
1613 (void)rsignal(i, PL_csighandlerp);
1614 else
1615 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1616 }
748a9306 1617 }
9dfa190b 1618
2d4fcd5e
AJ
1619#ifdef HAS_SIGPROCMASK
1620 if(i)
1621 LEAVE;
1622#endif
ef8d46e8 1623 SvREFCNT_dec(to_dec);
79072805
LW
1624 return 0;
1625}
64ca3a65 1626#endif /* !PERL_MICRO */
79072805
LW
1627
1628int
864dbfa3 1629Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1630{
97aff369 1631 dVAR;
7918f24d 1632 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1633 PERL_UNUSED_ARG(sv);
e1a479c5 1634
89c14e2e 1635 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1636 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1637 return 0;
1638
0e446081 1639 return magic_clearisa(NULL, mg);
463ee0b2
LW
1640}
1641
0e446081 1642/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1643int
52b45067
RD
1644Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1645{
1646 dVAR;
1647 HV* stash;
1648
7918f24d
NC
1649 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1650
52b45067 1651 /* Bail out if destruction is going on */
627364f1 1652 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1653
0e446081
NC
1654 if (sv)
1655 av_clear(MUTABLE_AV(sv));
52b45067 1656
6624142a
FC
1657 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1658 /* This occurs with setisa_elem magic, which calls this
1659 same function. */
1660 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1661
1662 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1663 SV **svp = AvARRAY((AV *)mg->mg_obj);
1664 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1665 while (items--) {
1666 stash = GvSTASH((GV *)*svp++);
1667 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1668 }
1669
1670 return 0;
1671 }
1672
52b45067 1673 stash = GvSTASH(
6624142a 1674 (const GV *)mg->mg_obj
52b45067
RD
1675 );
1676
00169e2c
FC
1677 /* The stash may have been detached from the symbol table, so check its
1678 name before doing anything. */
1679 if (stash && HvENAME_get(stash))
5562fa71 1680 mro_isa_changed_in(stash);
52b45067
RD
1681
1682 return 0;
1683}
1684
1685int
864dbfa3 1686Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1687{
97aff369 1688 dVAR;
7918f24d 1689 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
8772537c
AL
1690 PERL_UNUSED_ARG(sv);
1691 PERL_UNUSED_ARG(mg);
3280af22 1692 PL_amagic_generation++;
463ee0b2 1693
a0d0e21e
LW
1694 return 0;
1695}
463ee0b2 1696
946ec16e 1697int
864dbfa3 1698Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1699{
85fbaab2 1700 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1701 I32 i = 0;
7918f24d
NC
1702
1703 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1704 PERL_UNUSED_ARG(mg);
7719e241 1705
6ff81951 1706 if (hv) {
497b47a8 1707 (void) hv_iterinit(hv);
ad64d0ec 1708 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1709 i = HvUSEDKEYS(hv);
497b47a8
JH
1710 else {
1711 while (hv_iternext(hv))
1712 i++;
1713 }
6ff81951
GS
1714 }
1715
1716 sv_setiv(sv, (IV)i);
1717 return 0;
1718}
1719
1720int
864dbfa3 1721Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1722{
7918f24d 1723 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1724 PERL_UNUSED_ARG(mg);
946ec16e 1725 if (LvTARG(sv)) {
85fbaab2 1726 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1727 }
1728 return 0;
ac27b0f5 1729}
946ec16e 1730
efaf3674
DM
1731/*
1732=for apidoc magic_methcall
1733
1734Invoke a magic method (like FETCH).
1735
b6538e4f 1736* sv and mg are the tied thingy and the tie magic;
efaf3674 1737* meth is the name of the method to call;
1a1a5af7
DM
1738* argc is the number of args (in addition to $self) to pass to the method;
1739 the args themselves are any values following the argc argument.
efaf3674
DM
1740* flags:
1741 G_DISCARD: invoke method with G_DISCARD flag and don't return a value
1a1a5af7 1742 G_UNDEF_FILL: fill the stack with argc pointers to PL_sv_undef.
efaf3674
DM
1743
1744Returns the SV (if any) returned by the method, or NULL on failure.
1745
1746
1747=cut
1748*/
1749
1750SV*
c7a0c747 1751Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
046b0c7d 1752 U32 argc, ...)
a0d0e21e 1753{
97aff369 1754 dVAR;
a0d0e21e 1755 dSP;
efaf3674 1756 SV* ret = NULL;
463ee0b2 1757
7918f24d
NC
1758 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1759
efaf3674 1760 ENTER;
d1d7a15d
NC
1761
1762 if (flags & G_WRITING_TO_STDERR) {
1763 SAVETMPS;
1764
1765 save_re_context();
1766 SAVESPTR(PL_stderrgv);
1767 PL_stderrgv = NULL;
1768 }
1769
efaf3674 1770 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1771 PUSHMARK(SP);
efaf3674 1772
67549bd2
NC
1773 EXTEND(SP, argc+1);
1774 PUSHs(SvTIED_obj(sv, mg));
1775 if (flags & G_UNDEF_FILL) {
1776 while (argc--) {
efaf3674 1777 PUSHs(&PL_sv_undef);
93965878 1778 }
67549bd2 1779 } else if (argc > 0) {
046b0c7d
NC
1780 va_list args;
1781 va_start(args, argc);
1782
1783 do {
1784 SV *const sv = va_arg(args, SV *);
1785 PUSHs(sv);
1786 } while (--argc);
1787
1788 va_end(args);
88e89b8a 1789 }
463ee0b2 1790 PUTBACK;
efaf3674
DM
1791 if (flags & G_DISCARD) {
1792 call_method(meth, G_SCALAR|G_DISCARD);
1793 }
1794 else {
1795 if (call_method(meth, G_SCALAR))
1796 ret = *PL_stack_sp--;
1797 }
1798 POPSTACK;
d1d7a15d
NC
1799 if (flags & G_WRITING_TO_STDERR)
1800 FREETMPS;
efaf3674
DM
1801 LEAVE;
1802 return ret;
1803}
1804
1805
1806/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1807
efaf3674 1808STATIC SV*
c7a0c747 1809S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, const char *meth, U32 flags,
efaf3674
DM
1810 int n, SV *val)
1811{
1812 dVAR;
1813 SV* arg1 = NULL;
1814
1815 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1816
1817 if (mg->mg_ptr) {
1818 if (mg->mg_len >= 0) {
db4b3a1d 1819 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1820 }
1821 else if (mg->mg_len == HEf_SVKEY)
1822 arg1 = MUTABLE_SV(mg->mg_ptr);
1823 }
1824 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1825 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1826 sv_2mortal(arg1);
1827 }
1828 if (!arg1) {
046b0c7d 1829 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1830 }
046b0c7d 1831 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1832}
1833
76e3520e 1834STATIC int
e1ec3a88 1835S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
a0d0e21e 1836{
efaf3674
DM
1837 dVAR;
1838 SV* ret;
463ee0b2 1839
7918f24d
NC
1840 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1841
efaf3674
DM
1842 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1843 if (ret)
1844 sv_setsv(sv, ret);
a0d0e21e
LW
1845 return 0;
1846}
463ee0b2 1847
a0d0e21e 1848int
864dbfa3 1849Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1850{
7918f24d
NC
1851 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1852
fd69380d 1853 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1854 mg->mg_flags |= MGf_GSKIP;
58f82c5c 1855 magic_methpack(sv,mg,"FETCH");
463ee0b2
LW
1856 return 0;
1857}
1858
1859int
864dbfa3 1860Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1861{
efaf3674 1862 dVAR;
b112cff9
DM
1863 MAGIC *tmg;
1864 SV *val;
7918f24d
NC
1865
1866 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1867
b112cff9
DM
1868 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1869 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1870 * public flags indicate its value based on copying from $val. Doing
1871 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1872 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1873 * wrong if $val happened to be tainted, as sv hasn't got magic
1874 * enabled, even though taint magic is in the chain. In which case,
1875 * fake up a temporary tainted value (this is easier than temporarily
1876 * re-enabling magic on sv). */
1877
1878 if (PL_tainting && (tmg = mg_find(sv, PERL_MAGIC_taint))
1879 && (tmg->mg_len & 1))
1880 {
1881 val = sv_mortalcopy(sv);
1882 SvTAINTED_on(val);
1883 }
1884 else
1885 val = sv;
1886
efaf3674 1887 magic_methcall1(sv, mg, "STORE", G_DISCARD, 2, val);
463ee0b2
LW
1888 return 0;
1889}
1890
1891int
864dbfa3 1892Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1893{
7918f24d
NC
1894 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1895
a0d0e21e
LW
1896 return magic_methpack(sv,mg,"DELETE");
1897}
463ee0b2 1898
93965878
NIS
1899
1900U32
864dbfa3 1901Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1902{
efaf3674 1903 dVAR;
22846ab4 1904 I32 retval = 0;
efaf3674 1905 SV* retsv;
93965878 1906
7918f24d
NC
1907 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1908
efaf3674
DM
1909 retsv = magic_methcall1(sv, mg, "FETCHSIZE", 0, 1, NULL);
1910 if (retsv) {
1911 retval = SvIV(retsv)-1;
22846ab4
AB
1912 if (retval < -1)
1913 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1914 }
22846ab4 1915 return (U32) retval;
93965878
NIS
1916}
1917
cea2e8a9
GS
1918int
1919Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1920{
efaf3674 1921 dVAR;
463ee0b2 1922
7918f24d
NC
1923 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1924
046b0c7d 1925 Perl_magic_methcall(aTHX_ sv, mg, "CLEAR", G_DISCARD, 0);
463ee0b2
LW
1926 return 0;
1927}
1928
1929int
864dbfa3 1930Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1931{
efaf3674
DM
1932 dVAR;
1933 SV* ret;
463ee0b2 1934
7918f24d
NC
1935 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1936
046b0c7d
NC
1937 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, "NEXTKEY", 0, 1, key)
1938 : Perl_magic_methcall(aTHX_ sv, mg, "FIRSTKEY", 0, 0);
efaf3674
DM
1939 if (ret)
1940 sv_setsv(key,ret);
79072805
LW
1941 return 0;
1942}
1943
1944int
1146e912 1945Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1946{
7918f24d
NC
1947 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1948
a0d0e21e 1949 return magic_methpack(sv,mg,"EXISTS");
ac27b0f5 1950}
a0d0e21e 1951
a3bcc51e
TP
1952SV *
1953Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1954{
efaf3674 1955 dVAR;
5fcbf73d 1956 SV *retval;
ad64d0ec
NC
1957 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1958 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1959
7918f24d
NC
1960 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1961
a3bcc51e
TP
1962 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1963 SV *key;
bfcb3514 1964 if (HvEITER_get(hv))
a3bcc51e
TP
1965 /* we are in an iteration so the hash cannot be empty */
1966 return &PL_sv_yes;
1967 /* no xhv_eiter so now use FIRSTKEY */
1968 key = sv_newmortal();
ad64d0ec 1969 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1970 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
1971 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1972 }
1973
1974 /* there is a SCALAR method that we can call */
046b0c7d 1975 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, "SCALAR", 0, 0);
efaf3674 1976 if (!retval)
5fcbf73d 1977 retval = &PL_sv_undef;
a3bcc51e
TP
1978 return retval;
1979}
1980
a0d0e21e 1981int
864dbfa3 1982Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1983{
97aff369 1984 dVAR;
8772537c
AL
1985 GV * const gv = PL_DBline;
1986 const I32 i = SvTRUE(sv);
1987 SV ** const svp = av_fetch(GvAV(gv),
01b8bcb7 1988 atoi(MgPV_nolen_const(mg)), FALSE);
7918f24d
NC
1989
1990 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1991
8772537c
AL
1992 if (svp && SvIOKp(*svp)) {
1993 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1994 if (o) {
1995 /* set or clear breakpoint in the relevant control op */
1996 if (i)
1997 o->op_flags |= OPf_SPECIAL;
1998 else
1999 o->op_flags &= ~OPf_SPECIAL;
2000 }
5df8de69 2001 }
79072805
LW
2002 return 0;
2003}
2004
2005int
8772537c 2006Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2007{
97aff369 2008 dVAR;
502c6561 2009 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2010
2011 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2012
83bf042f 2013 if (obj) {
fc15ae8f 2014 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
83bf042f
NC
2015 } else {
2016 SvOK_off(sv);
2017 }
79072805
LW
2018 return 0;
2019}
2020
2021int
864dbfa3 2022Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2023{
97aff369 2024 dVAR;
502c6561 2025 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2026
2027 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2028
83bf042f 2029 if (obj) {
fc15ae8f 2030 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
83bf042f 2031 } else {
a2a5de95
NC
2032 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2033 "Attempt to set length of freed array");
83bf042f
NC
2034 }
2035 return 0;
2036}
2037
2038int
2039Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2040{
97aff369 2041 dVAR;
7918f24d
NC
2042
2043 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2044 PERL_UNUSED_ARG(sv);
7918f24d 2045
94f3782b
DM
2046 /* during global destruction, mg_obj may already have been freed */
2047 if (PL_in_clean_all)
1ea47f64 2048 return 0;
94f3782b 2049
83bf042f
NC
2050 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2051
2052 if (mg) {
2053 /* arylen scalar holds a pointer back to the array, but doesn't own a
2054 reference. Hence the we (the array) are about to go away with it
2055 still pointing at us. Clear its pointer, else it would be pointing
2056 at free memory. See the comment in sv_magic about reference loops,
2057 and why it can't own a reference to us. */
2058 mg->mg_obj = 0;
2059 }
a0d0e21e
LW
2060 return 0;
2061}
2062
2063int
864dbfa3 2064Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2065{
97aff369 2066 dVAR;
16eb5365 2067 SV* const lsv = LvTARG(sv);
7918f24d
NC
2068
2069 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2070 PERL_UNUSED_ARG(mg);
ac27b0f5 2071
a0d0e21e 2072 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
3881461a
AL
2073 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
2074 if (found && found->mg_len >= 0) {
2075 I32 i = found->mg_len;
7e2040f0 2076 if (DO_UTF8(lsv))
a0ed51b3 2077 sv_pos_b2u(lsv, &i);
fc15ae8f 2078 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
a0d0e21e
LW
2079 return 0;
2080 }
2081 }
0c34ef67 2082 SvOK_off(sv);
a0d0e21e
LW
2083 return 0;
2084}
2085
2086int
864dbfa3 2087Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2088{
97aff369 2089 dVAR;
16eb5365 2090 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2091 SSize_t pos;
2092 STRLEN len;
c00206c8 2093 STRLEN ulen = 0;
53d44271 2094 MAGIC* found;
a0d0e21e 2095
7918f24d 2096 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2097 PERL_UNUSED_ARG(mg);
ac27b0f5 2098
a0d0e21e 2099 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
3881461a
AL
2100 found = mg_find(lsv, PERL_MAGIC_regex_global);
2101 else
2102 found = NULL;
2103 if (!found) {
a0d0e21e
LW
2104 if (!SvOK(sv))
2105 return 0;
d83f0a82
NC
2106#ifdef PERL_OLD_COPY_ON_WRITE
2107 if (SvIsCOW(lsv))
2108 sv_force_normal_flags(lsv, 0);
2109#endif
3881461a 2110 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
53d44271 2111 NULL, 0);
a0d0e21e
LW
2112 }
2113 else if (!SvOK(sv)) {
3881461a 2114 found->mg_len = -1;
a0d0e21e
LW
2115 return 0;
2116 }
2117 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
2118
fc15ae8f 2119 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
a0ed51b3 2120
7e2040f0 2121 if (DO_UTF8(lsv)) {
a0ed51b3
LW
2122 ulen = sv_len_utf8(lsv);
2123 if (ulen)
2124 len = ulen;
a0ed51b3
LW
2125 }
2126
a0d0e21e
LW
2127 if (pos < 0) {
2128 pos += len;
2129 if (pos < 0)
2130 pos = 0;
2131 }
eb160463 2132 else if (pos > (SSize_t)len)
a0d0e21e 2133 pos = len;
a0ed51b3
LW
2134
2135 if (ulen) {
2136 I32 p = pos;
2137 sv_pos_u2b(lsv, &p, 0);
2138 pos = p;
2139 }
727405f8 2140
3881461a
AL
2141 found->mg_len = pos;
2142 found->mg_flags &= ~MGf_MINMATCH;
a0d0e21e 2143
79072805
LW
2144 return 0;
2145}
2146
2147int
864dbfa3 2148Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2149{
2150 STRLEN len;
35a4481c 2151 SV * const lsv = LvTARG(sv);
b83604b4 2152 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2153 STRLEN offs = LvTARGOFF(sv);
2154 STRLEN rem = LvTARGLEN(sv);
7918f24d
NC
2155
2156 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2157 PERL_UNUSED_ARG(mg);
6ff81951 2158
9aa983d2 2159 if (SvUTF8(lsv))
d931b1be 2160 offs = sv_pos_u2b_flags(lsv, offs, &rem, SV_CONST_RETURN);
777f7c56 2161 if (offs > len)
6ff81951 2162 offs = len;
777f7c56 2163 if (rem > len - offs)
6ff81951 2164 rem = len - offs;
1c900557 2165 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2166 if (SvUTF8(lsv))
2ef4b674 2167 SvUTF8_on(sv);
6ff81951
GS
2168 return 0;
2169}
2170
2171int
864dbfa3 2172Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2173{
97aff369 2174 dVAR;
9aa983d2 2175 STRLEN len;
5fcbf73d 2176 const char * const tmps = SvPV_const(sv, len);
dd374669 2177 SV * const lsv = LvTARG(sv);
777f7c56
EB
2178 STRLEN lvoff = LvTARGOFF(sv);
2179 STRLEN lvlen = LvTARGLEN(sv);
7918f24d
NC
2180
2181 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2182 PERL_UNUSED_ARG(mg);
075a4a2b 2183
1aa99e6b 2184 if (DO_UTF8(sv)) {
9aa983d2 2185 sv_utf8_upgrade(lsv);
d931b1be 2186 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
9aa983d2 2187 sv_insert(lsv, lvoff, lvlen, tmps, len);
b76f3ce2 2188 LvTARGLEN(sv) = sv_len_utf8(sv);
9aa983d2
JH
2189 SvUTF8_on(lsv);
2190 }
9bf12eaf 2191 else if (lsv && SvUTF8(lsv)) {
5fcbf73d 2192 const char *utf8;
d931b1be 2193 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
b76f3ce2 2194 LvTARGLEN(sv) = len;
5fcbf73d
AL
2195 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2196 sv_insert(lsv, lvoff, lvlen, utf8, len);
2197 Safefree(utf8);
1aa99e6b 2198 }
b76f3ce2
GB
2199 else {
2200 sv_insert(lsv, lvoff, lvlen, tmps, len);
2201 LvTARGLEN(sv) = len;
2202 }
2203
79072805
LW
2204 return 0;
2205}
2206
2207int
864dbfa3 2208Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2209{
97aff369 2210 dVAR;
7918f24d
NC
2211
2212 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2213 PERL_UNUSED_ARG(sv);
7918f24d 2214
27cc343c 2215 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW
2216 return 0;
2217}
2218
2219int
864dbfa3 2220Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2221{
97aff369 2222 dVAR;
7918f24d
NC
2223
2224 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2225 PERL_UNUSED_ARG(sv);
7918f24d 2226
b01e650a
DM
2227 /* update taint status */
2228 if (PL_tainted)
2229 mg->mg_len |= 1;
2230 else
2231 mg->mg_len &= ~1;
463ee0b2
LW
2232 return 0;
2233}
2234
2235int
864dbfa3 2236Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2237{
35a4481c 2238 SV * const lsv = LvTARG(sv);
7918f24d
NC
2239
2240 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2241 PERL_UNUSED_ARG(mg);
6ff81951 2242
6136c704
AL
2243 if (lsv)
2244 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2245 else
0c34ef67 2246 SvOK_off(sv);
6ff81951 2247
6ff81951
GS
2248 return 0;
2249}
2250
2251int
864dbfa3 2252Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2253{
7918f24d 2254 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2255 PERL_UNUSED_ARG(mg);
79072805
LW
2256 do_vecset(sv); /* XXX slurp this routine */
2257 return 0;
2258}
2259
2260int
864dbfa3 2261Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2262{
97aff369 2263 dVAR;
a0714e2c 2264 SV *targ = NULL;
7918f24d
NC
2265
2266 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2267
5f05dabc 2268 if (LvTARGLEN(sv)) {
68dc0745 2269 if (mg->mg_obj) {
8772537c 2270 SV * const ahv = LvTARG(sv);
85fbaab2 2271 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2272 if (he)
2273 targ = HeVAL(he);
68dc0745
PP
2274 }
2275 else {
502c6561 2276 AV *const av = MUTABLE_AV(LvTARG(sv));
68dc0745
PP
2277 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2278 targ = AvARRAY(av)[LvTARGOFF(sv)];
2279 }
46da273f 2280 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2281 /* somebody else defined it for us */
2282 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2283 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2284 LvTARGLEN(sv) = 0;
2285 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2286 mg->mg_obj = NULL;
68dc0745
PP
2287 mg->mg_flags &= ~MGf_REFCOUNTED;
2288 }
5f05dabc 2289 }
71be2cbc
PP
2290 else
2291 targ = LvTARG(sv);
3280af22 2292 sv_setsv(sv, targ ? targ : &PL_sv_undef);
71be2cbc
PP
2293 return 0;
2294}
2295
2296int
864dbfa3 2297Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2298{
7918f24d 2299 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2300 PERL_UNUSED_ARG(mg);
71be2cbc 2301 if (LvTARGLEN(sv))
68dc0745
PP
2302 vivify_defelem(sv);
2303 if (LvTARG(sv)) {
5f05dabc 2304 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2305 SvSETMAGIC(LvTARG(sv));
2306 }
5f05dabc
PP
2307 return 0;
2308}
2309
71be2cbc 2310void
864dbfa3 2311Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2312{
97aff369 2313 dVAR;
74e13ce4 2314 MAGIC *mg;
a0714e2c 2315 SV *value = NULL;
71be2cbc 2316
7918f24d
NC
2317 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2318
14befaf4 2319 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2320 return;
68dc0745 2321 if (mg->mg_obj) {
8772537c 2322 SV * const ahv = LvTARG(sv);
85fbaab2 2323 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2324 if (he)
2325 value = HeVAL(he);
3280af22 2326 if (!value || value == &PL_sv_undef)
be2597df 2327 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2328 }
68dc0745 2329 else {
502c6561 2330 AV *const av = MUTABLE_AV(LvTARG(sv));
5aabfad6 2331 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
a0714e2c 2332 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2333 else {
d4c19fe8 2334 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
3280af22 2335 if (!svp || (value = *svp) == &PL_sv_undef)
cea2e8a9 2336 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
68dc0745
PP
2337 }
2338 }
b37c2d43 2339 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2340 SvREFCNT_dec(LvTARG(sv));
2341 LvTARG(sv) = value;
71be2cbc 2342 LvTARGLEN(sv) = 0;
68dc0745 2343 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2344 mg->mg_obj = NULL;
68dc0745 2345 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2346}
2347
2348int
864dbfa3 2349Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2350{
7918f24d 2351 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2352 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2353 return 0;
810b8aa5
GS
2354}
2355
2356int
864dbfa3 2357Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2358{
7918f24d 2359 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2360 PERL_UNUSED_CONTEXT;
0177730e 2361 PERL_UNUSED_ARG(sv);
565764a8 2362 mg->mg_len = -1;
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);
0177730e
NC
2389 } else if (type == PERL_MAGIC_study) {
2390 if (!isGV_with_GP(sv))
2391 SvSCREAM_off(sv);
488344d2
NC
2392 } else {
2393 assert(type == PERL_MAGIC_fm);
488344d2
NC
2394 }
2395 return sv_unmagic(sv, type);
faf82a0b
AE
2396}
2397
7a4c00b4 2398#ifdef USE_LOCALE_COLLATE
79072805 2399int
864dbfa3 2400Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2401{
7918f24d
NC
2402 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2403
bbce6d69 2404 /*
838b5b74 2405 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2406 * and vanished with a faint plop.
2407 */
96a5add6 2408 PERL_UNUSED_CONTEXT;
8772537c 2409 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2410 if (mg->mg_ptr) {
2411 Safefree(mg->mg_ptr);
2412 mg->mg_ptr = NULL;
565764a8 2413 mg->mg_len = -1;
7a4c00b4 2414 }
bbce6d69
PP
2415 return 0;
2416}
7a4c00b4 2417#endif /* USE_LOCALE_COLLATE */
bbce6d69 2418
7e8c5dac
HS
2419/* Just clear the UTF-8 cache data. */
2420int
2421Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2422{
7918f24d 2423 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2424 PERL_UNUSED_CONTEXT;
8772537c 2425 PERL_UNUSED_ARG(sv);
7e8c5dac 2426 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2427 mg->mg_ptr = NULL;
7e8c5dac
HS
2428 mg->mg_len = -1; /* The mg_len holds the len cache. */
2429 return 0;
2430}
2431
bbce6d69 2432int
864dbfa3 2433Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2434{
97aff369 2435 dVAR;
e1ec3a88 2436 register const char *s;
2fdbfb4d
AB
2437 register I32 paren;
2438 register const REGEXP * rx;
2439 const char * const remaining = mg->mg_ptr + 1;
79072805 2440 I32 i;
8990e307 2441 STRLEN len;
125b9982 2442 MAGIC *tmg;
2fdbfb4d 2443
7918f24d
NC
2444 PERL_ARGS_ASSERT_MAGIC_SET;
2445
79072805 2446 switch (*mg->mg_ptr) {
2fdbfb4d
AB
2447 case '\015': /* $^MATCH */
2448 if (strEQ(remaining, "ATCH"))
2449 goto do_match;
2450 case '`': /* ${^PREMATCH} caught below */
2451 do_prematch:
f1b875a0 2452 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB
2453 goto setparen;
2454 case '\'': /* ${^POSTMATCH} caught below */
2455 do_postmatch:
f1b875a0 2456 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB
2457 goto setparen;
2458 case '&':
2459 do_match:
f1b875a0 2460 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d
AB
2461 goto setparen;
2462 case '1': case '2': case '3': case '4':
2463 case '5': case '6': case '7': case '8': case '9':
104a8018 2464 paren = atoi(mg->mg_ptr);
2fdbfb4d 2465 setparen:
1e05feb3 2466 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d 2467 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2468 } else {
2fdbfb4d
AB
2469 /* Croak with a READONLY error when a numbered match var is
2470 * set without a previous pattern match. Unless it's C<local $1>
2471 */
2472 if (!PL_localizing) {
6ad8f254 2473 Perl_croak_no_modify(aTHX);
2fdbfb4d
AB
2474 }
2475 }
9b9e0be4 2476 break;
748a9306 2477 case '\001': /* ^A */
3280af22 2478 sv_setsv(PL_bodytarget, sv);
125b9982
NT
2479 /* mg_set() has temporarily made sv non-magical */
2480 if (PL_tainting) {
2481 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2482 SvTAINTED_on(PL_bodytarget);
2483 else
2484 SvTAINTED_off(PL_bodytarget);
2485 }
748a9306 2486 break;
49460fe6 2487 case '\003': /* ^C */
f2338a2e 2488 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2489 break;
2490
79072805 2491 case '\004': /* ^D */
b4ab917c 2492#ifdef DEBUGGING
b83604b4 2493 s = SvPV_nolen_const(sv);
ddcf8bc1 2494 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS
2495 if (DEBUG_x_TEST || DEBUG_B_TEST)
2496 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2497#else
38ab35f8 2498 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2499#endif
79072805 2500 break;
28f23441 2501 case '\005': /* ^E */
d0063567 2502 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2503#ifdef VMS
38ab35f8 2504 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2505#else
2506# ifdef WIN32
d0063567 2507 SetLastError( SvIV(sv) );
e37778c2
NC
2508# else
2509# ifdef OS2
38ab35f8 2510 os2_setsyserrno(SvIV(sv));
e37778c2 2511# else
d0063567 2512 /* will anyone ever use this? */
38ab35f8 2513 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2514# endif
2515# endif
22fae026 2516#endif
d0063567
DK
2517 }
2518 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
ef8d46e8 2519 SvREFCNT_dec(PL_encoding);
d0063567
DK
2520 if (SvOK(sv) || SvGMAGICAL(sv)) {
2521 PL_encoding = newSVsv(sv);
2522 }
2523 else {
a0714e2c 2524 PL_encoding = NULL;
d0063567
DK
2525 }
2526 }
2527 break;
79072805 2528 case '\006': /* ^F */
38ab35f8 2529 PL_maxsysfd = SvIV(sv);
79072805 2530 break;
a0d0e21e 2531 case '\010': /* ^H */
38ab35f8 2532 PL_hints = SvIV(sv);
a0d0e21e 2533 break;
9d116dd7 2534 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2535 Safefree(PL_inplace);
bd61b366 2536 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2537 break;
28f23441 2538 case '\017': /* ^O */
ac27b0f5 2539 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2540 Safefree(PL_osname);
bd61b366 2541 PL_osname = NULL;
3511154c
DM
2542 if (SvOK(sv)) {
2543 TAINT_PROPER("assigning to $^O");
2e0de35c 2544 PL_osname = savesvpv(sv);
3511154c 2545 }
ac27b0f5
NIS
2546 }
2547 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2548 STRLEN len;
2549 const char *const start = SvPV(sv, len);
b54fc2b6 2550 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2551 SV *tmp;
8b850bd5
NC
2552
2553
2554 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2555 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2556
2557 /* Opening for input is more common than opening for output, so
2558 ensure that hints for input are sooner on linked list. */
59cd0e26 2559 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2560 SvUTF8(sv))
2561 : newSVpvs_flags("", SvUTF8(sv));
2562 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2563 mg_set(tmp);
8b850bd5 2564
f747ebd6
Z
2565 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2566 SvUTF8(sv));
2567 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2568 mg_set(tmp);
ac27b0f5 2569 }
28f23441 2570 break;
79072805 2571 case '\020': /* ^P */
2fdbfb4d
AB
2572 if (*remaining == '\0') { /* ^P */
2573 PL_perldb = SvIV(sv);
2574 if (PL_perldb && !PL_DBsingle)
2575 init_debugger();
2576 break;
2577 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2578 goto do_prematch;
2579 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2580 goto do_postmatch;
2581 }
9b9e0be4 2582 break;
79072805 2583 case '\024': /* ^T */
88e89b8a 2584#ifdef BIG_TIME
6b88bc9c 2585 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2586#else
38ab35f8 2587 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2588#endif
79072805 2589 break;
e07ea26a
NC
2590 case '\025': /* ^UTF8CACHE */
2591 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2592 PL_utf8cache = (signed char) sv_2iv(sv);
2593 }
2594 break;
fde18df1 2595 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2596 if (*(mg->mg_ptr+1) == '\0') {
2597 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2598 i = SvIV(sv);
ac27b0f5 2599 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2600 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2601 }
599cee73 2602 }
0a378802 2603 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2604 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
d775746e
GS
2605 if (!SvPOK(sv) && PL_localizing) {
2606 sv_setpvn(sv, WARN_NONEstring, WARNsize);
d3a7d8c7 2607 PL_compiling.cop_warnings = pWARN_NONE;
d775746e
GS
2608 break;
2609 }
f4fc7782 2610 {
b5477537 2611 STRLEN len, i;
d3a7d8c7 2612 int accumulate = 0 ;
f4fc7782 2613 int any_fatals = 0 ;
b83604b4 2614 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2615 for (i = 0 ; i < len ; ++i) {
2616 accumulate |= ptr[i] ;
2617 any_fatals |= (ptr[i] & 0xAA) ;
2618 }
4243c432
NC
2619 if (!accumulate) {
2620 if (!specialWARN(PL_compiling.cop_warnings))
2621 PerlMemShared_free(PL_compiling.cop_warnings);
2622 PL_compiling.cop_warnings = pWARN_NONE;
2623 }
72dc9ed5
NC
2624 /* Yuck. I can't see how to abstract this: */
2625 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2626 WARN_ALL) && !any_fatals) {
4243c432
NC
2627 if (!specialWARN(PL_compiling.cop_warnings))
2628 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH
2629 PL_compiling.cop_warnings = pWARN_ALL;
2630 PL_dowarn |= G_WARN_ONCE ;
727405f8 2631 }
d3a7d8c7 2632 else {
72dc9ed5
NC
2633 STRLEN len;
2634 const char *const p = SvPV_const(sv, len);
2635
2636 PL_compiling.cop_warnings
8ee4cf24 2637 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2638 p, len);
2639
d3a7d8c7
GS
2640 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2641 PL_dowarn |= G_WARN_ONCE ;
2642 }
f4fc7782 2643
d3a7d8c7 2644 }
4438c4b7 2645 }
971a9dd3 2646 }
79072805
LW
2647 break;
2648 case '.':
3280af22
NIS
2649 if (PL_localizing) {
2650 if (PL_localizing == 1)
7766f137 2651 SAVESPTR(PL_last_in_gv);
748a9306 2652 }
3280af22 2653 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2654 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2655 break;
2656 case '^':
099be4f1
DM
2657 if (isGV_with_GP(PL_defoutgv)) {
2658 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2659 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2660 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2661 }
79072805
LW
2662 break;
2663 case '~':
099be4f1
DM
2664 if (isGV_with_GP(PL_defoutgv)) {
2665 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2666 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2667 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
2668 }
79072805
LW
2669 break;
2670 case '=':
099be4f1
DM
2671 if (isGV_with_GP(PL_defoutgv))
2672 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2673 break;
2674 case '-':
099be4f1
DM
2675 if (isGV_with_GP(PL_defoutgv)) {
2676 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2677 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2678 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2679 }
79072805
LW
2680 break;
2681 case '%':
099be4f1
DM
2682 if (isGV_with_GP(PL_defoutgv))
2683 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2684 break;
2685 case '|':
4b65379b 2686 {
099be4f1 2687 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2688 if(!io)
2689 break;
38ab35f8 2690 if ((SvIV(sv)) == 0)
4b65379b
CS
2691 IoFLAGS(io) &= ~IOf_FLUSH;
2692 else {
2693 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2694 PerlIO *ofp = IoOFP(io);
2695 if (ofp)
2696 (void)PerlIO_flush(ofp);
2697 IoFLAGS(io) |= IOf_FLUSH;
2698 }
2699 }
79072805
LW
2700 }
2701 break;
79072805 2702 case '/':
3280af22 2703 SvREFCNT_dec(PL_rs);
8bfdd7d9 2704 PL_rs = newSVsv(sv);
79072805
LW
2705 break;
2706 case '\\':
ef8d46e8 2707 SvREFCNT_dec(PL_ors_sv);
009c130f 2708 if (SvOK(sv) || SvGMAGICAL(sv)) {
7889fe52 2709 PL_ors_sv = newSVsv(sv);
009c130f 2710 }
e3c19b7b 2711 else {
a0714e2c 2712 PL_ors_sv = NULL;
e3c19b7b 2713 }
79072805 2714 break;
79072805 2715 case '[':
38ab35f8 2716 CopARYBASE_set(&PL_compiling, SvIV(sv));
79072805
LW
2717 break;
2718 case '?':
ff0cee69 2719#ifdef COMPLEX_STATUS
6b88bc9c 2720 if (PL_localizing == 2) {
41cb7b2b 2721 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2722 PL_statusvalue = LvTARGOFF(sv);
2723 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2724 }
2725 else
2726#endif
2727#ifdef VMSISH_STATUS
2728 if (VMSISH_STATUS)
fb38d079 2729 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2730 else
2731#endif
38ab35f8 2732 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2733 break;
2734 case '!':
93189314
JH
2735 {
2736#ifdef VMS
2737# define PERL_VMS_BANG vaxc$errno
2738#else
2739# define PERL_VMS_BANG 0
2740#endif
91487cfc 2741 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314
JH
2742 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2743 }
79072805
LW
2744 break;
2745 case '<':
38ab35f8 2746 PL_uid = SvIV(sv);
3280af22
NIS
2747 if (PL_delaymagic) {
2748 PL_delaymagic |= DM_RUID;
79072805
LW
2749 break; /* don't do magic till later */
2750 }
2751#ifdef HAS_SETRUID
b28d0864 2752 (void)setruid((Uid_t)PL_uid);
79072805
LW
2753#else
2754#ifdef HAS_SETREUID
3280af22 2755 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
748a9306 2756#else
85e6fe83 2757#ifdef HAS_SETRESUID
b28d0864 2758 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2759#else
75870ed3 2760 if (PL_uid == PL_euid) { /* special case $< = $> */
2761#ifdef PERL_DARWIN
2762 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2763 if (PL_uid != 0 && PerlProc_getuid() == 0)
2764 (void)PerlProc_setuid(0);
2765#endif
b28d0864 2766 (void)PerlProc_setuid(PL_uid);
75870ed3 2767 } else {
d8eceb89 2768 PL_uid = PerlProc_getuid();
cea2e8a9 2769 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2770 }
79072805
LW
2771#endif
2772#endif
85e6fe83 2773#endif
d8eceb89 2774 PL_uid = PerlProc_getuid();
79072805
LW
2775 break;
2776 case '>':
38ab35f8 2777 PL_euid = SvIV(sv);
3280af22
NIS
2778 if (PL_delaymagic) {
2779 PL_delaymagic |= DM_EUID;
79072805
LW
2780 break; /* don't do magic till later */
2781 }
2782#ifdef HAS_SETEUID
3280af22 2783 (void)seteuid((Uid_t)PL_euid);
79072805
LW
2784#else
2785#ifdef HAS_SETREUID
b28d0864 2786 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
85e6fe83
LW
2787#else
2788#ifdef HAS_SETRESUID
6b88bc9c 2789 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
79072805 2790#else
b28d0864
NIS
2791 if (PL_euid == PL_uid) /* special case $> = $< */
2792 PerlProc_setuid(PL_euid);
a0d0e21e 2793 else {
e8ee3774 2794 PL_euid = PerlProc_geteuid();
cea2e8a9 2795 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2796 }
79072805
LW
2797#endif
2798#endif
85e6fe83 2799#endif
d8eceb89 2800 PL_euid = PerlProc_geteuid();
79072805
LW
2801 break;
2802 case '(':
38ab35f8 2803 PL_gid = SvIV(sv);
3280af22
NIS
2804 if (PL_delaymagic) {
2805 PL_delaymagic |= DM_RGID;
79072805
LW
2806 break; /* don't do magic till later */
2807 }
2808#ifdef HAS_SETRGID
b28d0864 2809 (void)setrgid((Gid_t)PL_gid);
79072805
LW
2810#else
2811#ifdef HAS_SETREGID
3280af22 2812 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
85e6fe83
LW
2813#else
2814#ifdef HAS_SETRESGID
b28d0864 2815 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
79072805 2816#else
b28d0864
NIS
2817 if (PL_gid == PL_egid) /* special case $( = $) */
2818 (void)PerlProc_setgid(PL_gid);
748a9306 2819 else {
d8eceb89 2820 PL_gid = PerlProc_getgid();
cea2e8a9 2821 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2822 }
79072805
LW
2823#endif
2824#endif
85e6fe83 2825#endif
d8eceb89 2826 PL_gid = PerlProc_getgid();
79072805
LW
2827 break;
2828 case ')':
5cd24f17
PP
2829#ifdef HAS_SETGROUPS
2830 {
b83604b4 2831 const char *p = SvPV_const(sv, len);
757f63d8 2832 Groups_t *gary = NULL;
fb4089e0 2833#ifdef _SC_NGROUPS_MAX
2834 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2835
2836 if (maxgrp < 0)
2837 maxgrp = NGROUPS;
2838#else
2839 int maxgrp = NGROUPS;
2840#endif
757f63d8
SP
2841
2842 while (isSPACE(*p))
2843 ++p;
2844 PL_egid = Atol(p);
fb4089e0 2845 for (i = 0; i < maxgrp; ++i) {
757f63d8
SP
2846 while (*p && !isSPACE(*p))
2847 ++p;
2848 while (isSPACE(*p))
2849 ++p;
2850 if (!*p)
2851 break;
2852 if(!gary)
2853 Newx(gary, i + 1, Groups_t);
2854 else
2855 Renew(gary, i + 1, Groups_t);
2856 gary[i] = Atol(p);
2857 }
2858 if (i)
2859 (void)setgroups(i, gary);
f5a63d97 2860 Safefree(gary);
5cd24f17
PP
2861 }
2862#else /* HAS_SETGROUPS */
38ab35f8 2863 PL_egid = SvIV(sv);
5cd24f17 2864#endif /* HAS_SETGROUPS */
3280af22
NIS
2865 if (PL_delaymagic) {
2866 PL_delaymagic |= DM_EGID;
79072805
LW
2867 break; /* don't do magic till later */
2868 }
2869#ifdef HAS_SETEGID
3280af22 2870 (void)setegid((Gid_t)PL_egid);
79072805
LW
2871#else
2872#ifdef HAS_SETREGID
b28d0864 2873 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
85e6fe83
LW
2874#else
2875#ifdef HAS_SETRESGID
b28d0864 2876 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
79072805 2877#else
b28d0864
NIS
2878 if (PL_egid == PL_gid) /* special case $) = $( */
2879 (void)PerlProc_setgid(PL_egid);
748a9306 2880 else {
d8eceb89 2881 PL_egid = PerlProc_getegid();
cea2e8a9 2882 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2883 }
79072805
LW
2884#endif
2885#endif
85e6fe83 2886#endif
d8eceb89 2887 PL_egid = PerlProc_getegid();
79072805
LW
2888 break;
2889 case ':':
2d8e6c8d 2890 PL_chopset = SvPV_force(sv,len);
79072805 2891 break;
9cdac2a2
FC
2892 case '$': /* $$ */
2893 /* Store the pid in mg->mg_obj so we can tell when a fork has
2894 occurred. mg->mg_obj points to *$ by default, so clear it. */
2895 if (isGV(mg->mg_obj)) {
2896 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
2897 SvREFCNT_dec(mg->mg_obj);
2898 mg->mg_flags |= MGf_REFCOUNTED;
2899 mg->mg_obj = newSViv((IV)PerlProc_getpid());
2900 }
2901 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
2902 break;
79072805 2903 case '0':
e2975953 2904 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS
2905#ifdef HAS_SETPROCTITLE
2906 /* The BSDs don't show the argv[] in ps(1) output, they
2907 * show a string from the process struct and provide
2908 * the setproctitle() routine to manipulate that. */
a2722ac9 2909 if (PL_origalen != 1) {
b83604b4 2910 s = SvPV_const(sv, len);
98b76f99 2911# if __FreeBSD_version > 410001
9aad2c0e 2912 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS
2913 * but not the "(perl) suffix from the ps(1)
2914 * output, because that's what ps(1) shows if the
2915 * argv[] is modified. */
6f2ad931 2916 setproctitle("-%s", s);
9aad2c0e 2917# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS
2918 /* This doesn't really work if you assume that
2919 * $0 = 'foobar'; will wipe out 'perl' from the $0
2920 * because in ps(1) output the result will be like
2921 * sprintf("perl: %s (perl)", s)
2922 * I guess this is a security feature:
2923 * one (a user process) cannot get rid of the original name.
2924 * --jhi */
2925 setproctitle("%s", s);
2926# endif
2927 }
9d3968b2 2928#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 2929 if (PL_origalen != 1) {
17aa7f3d 2930 union pstun un;
b83604b4 2931 s = SvPV_const(sv, len);
6867be6d 2932 un.pst_command = (char *)s;
17aa7f3d
JH
2933 pstat(PSTAT_SETCMD, un, len, 0, 0);
2934 }
9d3968b2 2935#else
2d2af554
GA
2936 if (PL_origalen > 1) {
2937 /* PL_origalen is set in perl_parse(). */
2938 s = SvPV_force(sv,len);
2939 if (len >= (STRLEN)PL_origalen-1) {
2940 /* Longer than original, will be truncated. We assume that
2941 * PL_origalen bytes are available. */
2942 Copy(s, PL_origargv[0], PL_origalen-1, char);
2943 }
2944 else {
2945 /* Shorter than original, will be padded. */
235ac35d 2946#ifdef PERL_DARWIN
60777a0d
JH
2947 /* Special case for Mac OS X: see [perl #38868] */
2948 const int pad = 0;
235ac35d 2949#else
8a89a4f1
MB
2950 /* Is the space counterintuitive? Yes.
2951 * (You were expecting \0?)
2952 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2953 * --jhi */
60777a0d 2954 const int pad = ' ';
235ac35d 2955#endif
60777a0d
JH
2956 Copy(s, PL_origargv[0], len, char);
2957 PL_origargv[0][len] = 0;
2958 memset(PL_origargv[0] + len + 1,
2959 pad, PL_origalen - len - 1);
2d2af554
GA
2960 }
2961 PL_origargv[0][PL_origalen-1] = 0;
2962 for (i = 1; i < PL_origargc; i++)
2963 PL_origargv[i] = 0;
7636ea95
AB
2964#ifdef HAS_PRCTL_SET_NAME
2965 /* Set the legacy process name in addition to the POSIX name on Linux */
2966 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2967 /* diag_listed_as: SKIPME */
2968 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2969 }
2970#endif
79072805 2971 }
9d3968b2 2972#endif
e2975953 2973 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
2974 break;
2975 }
2976 return 0;
2977}
2978
2979I32
35a4481c 2980Perl_whichsig(pTHX_ const char *sig)
79072805 2981{
aadb217d 2982 register char* const* sigv;
7918f24d
NC
2983
2984 PERL_ARGS_ASSERT_WHICHSIG;
96a5add6 2985 PERL_UNUSED_CONTEXT;
79072805 2986
aadb217d 2987 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
79072805 2988 if (strEQ(sig,*sigv))
aadb217d 2989 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805
LW
2990#ifdef SIGCLD
2991 if (strEQ(sig,"CHLD"))
2992 return SIGCLD;
2993#endif
2994#ifdef SIGCHLD
2995 if (strEQ(sig,"CLD"))
2996 return SIGCHLD;
2997#endif
7f1236c0 2998 return -1;
79072805
LW
2999}
3000
ecfc5424 3001Signal_t
1e82f5a6 3002#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3003Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3004#else
3005Perl_sighandler(int sig)
3006#endif
79072805 3007{
1018e26f
NIS
3008#ifdef PERL_GET_SIG_CONTEXT
3009 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3010#else
cea2e8a9 3011 dTHX;
71d280e3 3012#endif
79072805 3013 dSP;
a0714e2c
SS
3014 GV *gv = NULL;
3015 SV *sv = NULL;
8772537c 3016 SV * const tSv = PL_Sv;
601f1833 3017 CV *cv = NULL;
533c011a 3018 OP *myop = PL_op;
84902520 3019 U32 flags = 0;
8772537c 3020 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3021 I32 old_ss_ix = PL_savestack_ix;
71d280e3 3022
84902520 3023
727405f8 3024 if (!PL_psig_ptr[sig]) {
99ef548b 3025 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3026 PL_sig_name[sig]);
3027 exit(sig);
3028 }
ff0cee69 3029
a0d63a7b
DM
3030 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3031 /* Max number of items pushed there is 3*n or 4. We cannot fix
3032 infinity, so we fix 4 (in fact 5): */
3033 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3034 flags |= 1;
3035 PL_savestack_ix += 5; /* Protect save in progress. */
3036 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3037 }
84902520 3038 }
84902520 3039 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3040 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3041 || SvTYPE(cv) != SVt_PVCV) {
3042 HV *st;
f2c0649b 3043 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3044 }
84902520 3045
a0d0e21e 3046 if (!cv || !CvROOT(cv)) {
a2a5de95
NC
3047 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3048 PL_sig_name[sig], (gv ? GvENAME(gv)
3049 : ((cv && CvGV(cv))
3050 ? GvENAME(CvGV(cv))
3051 : "__ANON__")));
00d579c5 3052 goto cleanup;
79072805
LW
3053 }
3054
0c4d3b5e
DM
3055 sv = PL_psig_name[sig]
3056 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3057 : newSVpv(PL_sig_name[sig],0);
72048cfe 3058 flags |= 8;
0c4d3b5e
DM
3059 SAVEFREESV(sv);
3060
a0d63a7b
DM
3061 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3062 /* make sure our assumption about the size of the SAVEs are correct:
3063 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3064 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3065 }
e336de0d 3066
e788e7d3 3067 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3068 PUSHMARK(SP);
79072805 3069 PUSHs(sv);
8aad04aa
JH
3070#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3071 {
3072 struct sigaction oact;
3073
3074 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3075 if (sip) {
3076 HV *sih = newHV();
ad64d0ec 3077 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3078 /* The siginfo fields signo, code, errno, pid, uid,
3079 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3080 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3081 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3082#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
3083 hv_stores(sih, "errno", newSViv(sip->si_errno));
3084 hv_stores(sih, "status", newSViv(sip->si_status));
3085 hv_stores(sih, "uid", newSViv(sip->si_uid));
3086 hv_stores(sih, "pid", newSViv(sip->si_pid));
3087 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3088 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3089#endif
8aad04aa 3090 EXTEND(SP, 2);
ad64d0ec 3091 PUSHs(rv);
22f1178f 3092 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3093 }
b4552a27 3094
8aad04aa
JH
3095 }
3096 }
3097#endif
79072805 3098 PUTBACK;
a0d0e21e 3099
ad64d0ec 3100 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3101
d3acc0f7 3102 POPSTACK;
1b266415 3103 if (SvTRUE(ERRSV)) {
c22d665b 3104#ifndef PERL_MICRO
1b266415
NIS
3105 /* Handler "died", for example to get out of a restart-able read().
3106 * Before we re-do that on its behalf re-enable the signal which was
3107 * blocked by the system when we entered.
3108 */
c22d665b 3109#ifdef HAS_SIGPROCMASK
d488af49 3110#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3111 if (sip || uap)
c22d665b
LT
3112#endif
3113 {
3114 sigset_t set;
3115 sigemptyset(&set);
3116 sigaddset(&set,sig);
3117 sigprocmask(SIG_UNBLOCK, &set, NULL);
3118 }
3119#else
1b266415
NIS
3120 /* Not clear if this will work */
3121 (void)rsignal(sig, SIG_IGN);
5c1546dc 3122 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3123#endif
3124#endif /* !PERL_MICRO */
c5df3096 3125 die_sv(ERRSV);
1b266415 3126 }
00d579c5 3127cleanup:
0c4d3b5e
DM
3128 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3129 PL_savestack_ix = old_ss_ix;
72048cfe 3130 if (flags & 8)
84902520 3131 SvREFCNT_dec(sv);
533c011a 3132 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3133
3280af22
NIS
3134 PL_Sv = tSv; /* Restore global temporaries. */
3135 PL_Xpv = tXpv;
53bb94e2 3136 return;
79072805 3137}
4e35701f
NIS
3138
3139
51371543 3140static void
8772537c 3141S_restore_magic(pTHX_ const void *p)
51371543 3142{
97aff369 3143 dVAR;
8772537c
AL
3144 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3145 SV* const sv = mgs->mgs_sv;
150b625d 3146 bool bumped;
51371543
GS
3147
3148 if (!sv)
3149 return;
3150
3151 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
3152 {
f8c7b90f 3153#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC
3154 /* While magic was saved (and off) sv_setsv may well have seen
3155 this SV as a prime candidate for COW. */
3156 if (SvIsCOW(sv))
e424a81e 3157 sv_force_normal_flags(sv, 0);
f9701176
NC
3158#endif
3159
f9c6fee5
CS
3160 if (mgs->mgs_readonly)
3161 SvREADONLY_on(sv);
3162 if (mgs->mgs_magical)
3163 SvFLAGS(sv) |= mgs->mgs_magical;
51371543
GS
3164 else
3165 mg_magical(sv);
2b77b520
YST
3166 if (SvGMAGICAL(sv)) {
3167 /* downgrade public flags to private,
3168 and discard any other private flags */
3169
10edeb5d
JH
3170 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
3171 if (pubflags) {
3172 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
3173 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
2b77b520
YST
3174 }
3175 }
51371543
GS
3176 }
3177
150b625d 3178 bumped = mgs->mgs_bumped;
51371543
GS
3179 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3180
3181 /* If we're still on top of the stack, pop us off. (That condition
3182 * will be satisfied if restore_magic was called explicitly, but *not*
3183 * if it's being called via leave_scope.)
3184 * The reason for doing this is that otherwise, things like sv_2cv()
3185 * may leave alloc gunk on the savestack, and some code
3186 * (e.g. sighandler) doesn't expect that...
3187 */
3188 if (PL_savestack_ix == mgs->mgs_ss_ix)
3189 {
1be36ce0
NC
3190 UV popval = SSPOPUV;
3191 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3192 PL_savestack_ix -= 2;
1be36ce0
NC
3193 popval = SSPOPUV;
3194 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3195 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3196 }
150b625d
DM
3197 if (bumped) {
3198 if (SvREFCNT(sv) == 1) {
3199 /* We hold the last reference to this SV, which implies that the
3200 SV was deleted as a side effect of the routines we called.
3201 So artificially keep it alive a bit longer.
3202 We avoid turning on the TEMP flag, which can cause the SV's
3203 buffer to get stolen (and maybe other stuff). */
3204 int was_temp = SvTEMP(sv);
3205 sv_2mortal(sv);
3206 if (!was_temp) {
3207 SvTEMP_off(sv);
3208 }
3209 SvOK_off(sv);
8985fe98 3210 }
150b625d
DM
3211 else
3212 SvREFCNT_dec(sv); /* undo the inc in S_save_magic() */
8985fe98 3213 }
51371543
GS
3214}
3215
0c4d3b5e
DM
3216/* clean up the mess created by Perl_sighandler().
3217 * Note that this is only called during an exit in a signal handler;
3218 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3219 * skipped over. */
0c4d3b5e 3220
51371543 3221static void
8772537c 3222S_unwind_handler_stack(pTHX_ const void *p)
51371543 3223{
27da23d5 3224 dVAR;
0c4d3b5e 3225 PERL_UNUSED_ARG(p);
7918f24d 3226
0c4d3b5e 3227 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3228}
1018e26f 3229
66610fdd 3230/*
b3ca2e83
NC
3231=for apidoc magic_sethint
3232
3233Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC
3234C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3235anything that would need a deep copy. Maybe we should warn if we find a
3236reference.
b3ca2e83
NC
3237
3238=cut
3239*/
3240int
3241Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3242{
3243 dVAR;
ad64d0ec 3244 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3245 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3246
7918f24d
NC
3247 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3248
e6e3e454
NC
3249 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3250 an alternative leaf in there, with PL_compiling.cop_hints being used if
3251 it's NULL. If needed for threads, the alternative could lock a mutex,
3252 or take other more complex action. */
3253
5b9c0671
NC
3254 /* Something changed in %^H, so it will need to be restored on scope exit.
3255 Doing this here saves a lot of doing it manually in perl code (and
3256 forgetting to do it, and consequent subtle errors. */
3257 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z
3258 CopHINTHASH_set(&PL_compiling,
3259 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC
3260 return 0;
3261}
3262
3263/*
f175cff5 3264=for apidoc magic_clearhint
b3ca2e83 3265
c28fe1ec
NC
3266Triggered by a delete from %^H, records the key to
3267C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC
3268
3269=cut
3270*/
3271int
3272Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3273{
3274 dVAR;
7918f24d
NC
3275
3276 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL
3277 PERL_UNUSED_ARG(sv);
3278
b3ca2e83
NC
3279 assert(mg->mg_len == HEf_SVKEY);
3280
b3f24c00
MHM
3281 PERL_UNUSED_ARG(sv);
3282
5b9c0671 3283 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z
3284 CopHINTHASH_set(&PL_compiling,
3285 cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3286 MUTABLE_SV(mg->mg_ptr), 0, 0));
b3ca2e83
NC
3287 return 0;
3288}
3289
3290/*
f747ebd6
Z
3291=for apidoc magic_clearhints
3292
3293Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3294
3295=cut
3296*/
3297int
3298Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3299{
3300 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3301 PERL_UNUSED_ARG(sv);
3302 PERL_UNUSED_ARG(mg);
20439bc7
Z
3303 cophh_free(CopHINTHASH_get(&PL_compiling));
3304 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
f747ebd6
Z
3305 return 0;
3306}
3307
3308/*
66610fdd
RGS
3309 * Local variables:
3310 * c-indentation-style: bsd
3311 * c-basic-offset: 4
3312 * indent-tabs-mode: t
3313 * End:
3314 *
37442d52
RGS
3315 * ex: set ts=8 sts=4 sw=4 noet:
3316 */