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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 78/*
4bac9ae4 79 * Pre-magic setup and post-magic takedown.
c07a80fd
PP
80 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
81 */
82
83struct magic_state {
84 SV* mgs_sv;
455ece5e 85 I32 mgs_ss_ix;
f9c6fee5
CS
86 U32 mgs_magical;
87 bool mgs_readonly;
150b625d 88 bool mgs_bumped;
c07a80fd 89};
455ece5e 90/* MGS is typedef'ed to struct magic_state in perl.h */
76e3520e
GS
91
92STATIC void
ff44333e 93S_save_magic_flags(pTHX_ I32 mgs_ix, SV *sv, U32 flags)
c07a80fd 94{
97aff369 95 dVAR;
455ece5e 96 MGS* mgs;
150b625d 97 bool bumped = FALSE;
7918f24d 98
ff44333e 99 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
7918f24d 100
4bac9ae4
CS
101 assert(SvMAGICAL(sv));
102
150b625d
DM
103 /* we shouldn't really be called here with RC==0, but it can sometimes
104 * happen via mg_clear() (which also shouldn't be called when RC==0,
105 * but it can happen). Handle this case gracefully(ish) by not RC++
106 * and thus avoiding the resultant double free */
107 if (SvREFCNT(sv) > 0) {
108 /* guard against sv getting freed midway through the mg clearing,
109 * by holding a private reference for the duration. */
110 SvREFCNT_inc_simple_void_NN(sv);
111 bumped = TRUE;
112 }
8985fe98 113
8772537c 114 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
115
116 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 117 mgs->mgs_sv = sv;
f9c6fee5 118 mgs->mgs_magical = SvMAGICAL(sv);
46959f1c 119 mgs->mgs_readonly = SvREADONLY(sv) != 0;
455ece5e 120 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
150b625d 121 mgs->mgs_bumped = bumped;
c07a80fd 122
ff44333e 123 SvFLAGS(sv) &= ~flags;
3805b5fb 124 SvREADONLY_off(sv);
c07a80fd
PP
125}
126
ff44333e
FC
127#define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
128
954c1994
GS
129/*
130=for apidoc mg_magical
131
132Turns on the magical status of an SV. See C<sv_magic>.
133
134=cut
135*/
136
8990e307 137void
864dbfa3 138Perl_mg_magical(pTHX_ SV *sv)
8990e307 139{
e1ec3a88 140 const MAGIC* mg;
7918f24d 141 PERL_ARGS_ASSERT_MG_MAGICAL;
96a5add6 142 PERL_UNUSED_CONTEXT;
f9c6fee5
CS
143
144 SvMAGICAL_off(sv);
218787bd 145 if ((mg = SvMAGIC(sv))) {
218787bd
VP
146 do {
147 const MGVTBL* const vtbl = mg->mg_virtual;
148 if (vtbl) {
149 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
150 SvGMAGICAL_on(sv);
151 if (vtbl->svt_set)
152 SvSMAGICAL_on(sv);
153 if (vtbl->svt_clear)
154 SvRMAGICAL_on(sv);
155 }
156 } while ((mg = mg->mg_moremagic));
157 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
158 SvRMAGICAL_on(sv);
8990e307
LW
159 }
160}
161
954c1994
GS
162/*
163=for apidoc mg_get
164
4b1e7f06
DD
165Do magic before a value is retrieved from the SV. The type of SV must
166be >= SVt_PVMG. See C<sv_magic>.
954c1994
GS
167
168=cut
169*/
170
79072805 171int
864dbfa3 172Perl_mg_get(pTHX_ SV *sv)
79072805 173{
97aff369 174 dVAR;
35a4481c 175 const I32 mgs_ix = SSNEW(sizeof(MGS));
a9844598 176 bool saved = FALSE;
f9c6fee5 177 bool have_new = 0;
ff76feab 178 MAGIC *newmg, *head, *cur, *mg;
6683b158 179
7918f24d
NC
180 PERL_ARGS_ASSERT_MG_GET;
181
407287f9
FC
182 if (PL_localizing == 1 && sv == DEFSV) return 0;
183
ff76feab
AMS
184 /* We must call svt_get(sv, mg) for each valid entry in the linked
185 list of magic. svt_get() may delete the current entry, add new
186 magic to the head of the list, or upgrade the SV. AMS 20010810 */
187
188 newmg = cur = head = mg = SvMAGIC(sv);
189 while (mg) {
35a4481c 190 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 191 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 192
2b260de0 193 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
194
195 /* taint's mg get is so dumb it doesn't need flag saving */
196 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
197 save_magic(mgs_ix, sv);
198 saved = TRUE;
199 }
200
16c91539 201 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 202
58f82c5c
DM
203 /* guard against magic having been deleted - eg FETCH calling
204 * untie */
f9c6fee5
CS
205 if (!SvMAGIC(sv)) {
206 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
58f82c5c 207 break;
f9c6fee5 208 }
b77f7d40 209
f9c6fee5 210 /* recalculate flags if this entry was deleted. */
ff76feab 211 if (mg->mg_flags & MGf_GSKIP)
f9c6fee5 212 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0;
a0d0e21e 213 }
7d1328bb
FC
214 else if (vtbl == &PL_vtbl_utf8) {
215 /* get-magic can reallocate the PV */
216 magic_setutf8(sv, mg);
217 }
ff76feab 218
f9c6fee5 219 mg = nextmg;
ff76feab 220
0723351e 221 if (have_new) {
ff76feab
AMS
222 /* Have we finished with the new entries we saw? Start again
223 where we left off (unless there are more new entries). */
224 if (mg == head) {
0723351e 225 have_new = 0;
ff76feab
AMS
226 mg = cur;
227 head = newmg;
228 }
229 }
230
231 /* Were any new entries added? */
0723351e
NC
232 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
233 have_new = 1;
ff76feab
AMS
234 cur = mg;
235 mg = newmg;
f9c6fee5 236 (SSPTR(mgs_ix, MGS *))->mgs_magical = 0; /* recalculate flags */
760ac839 237 }
79072805 238 }
463ee0b2 239
a9844598
CS
240 if (saved)
241 restore_magic(INT2PTR(void *, (IV)mgs_ix));
242
79072805
LW
243 return 0;
244}
245
954c1994
GS
246/*
247=for apidoc mg_set
248
249Do magic after a value is assigned to the SV. See C<sv_magic>.
250
251=cut
252*/
253
79072805 254int
864dbfa3 255Perl_mg_set(pTHX_ SV *sv)
79072805 256{
97aff369 257 dVAR;
35a4481c 258 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 259 MAGIC* mg;
463ee0b2
LW
260 MAGIC* nextmg;
261
7918f24d
NC
262 PERL_ARGS_ASSERT_MG_SET;
263
b5ed8c44
FC
264 if (PL_localizing == 2 && sv == DEFSV) return 0;
265
ff44333e 266 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
267
268 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 269 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 270 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
271 if (mg->mg_flags & MGf_GSKIP) {
272 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
f9c6fee5 273 (SSPTR(mgs_ix, MGS*))->mgs_magical = 0;
a0d0e21e 274 }
e0a73de4 275 if (PL_localizing == 2
b5ed8c44 276 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 277 continue;
2b260de0 278 if (vtbl && vtbl->svt_set)
16c91539 279 vtbl->svt_set(aTHX_ sv, mg);
79072805 280 }
463ee0b2 281
8772537c 282 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
283 return 0;
284}
285
954c1994
GS
286/*
287=for apidoc mg_length
288
d4e99c76 289Reports on the SV's length in bytes, calling length magic if available,
bd8446cf
FC
290but does not set the UTF8 flag on the sv. It will fall back to 'get'
291magic if there is no 'length' magic, but with no indication as to
292whether it called 'get' magic. It assumes the sv is a PVMG or
293higher. Use sv_len() instead.
954c1994
GS
294
295=cut
296*/
297
79072805 298U32
864dbfa3 299Perl_mg_length(pTHX_ SV *sv)
79072805 300{
97aff369 301 dVAR;
79072805 302 MAGIC* mg;
463ee0b2 303 STRLEN len;
463ee0b2 304
7918f24d
NC
305 PERL_ARGS_ASSERT_MG_LENGTH;
306
79072805 307 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 308 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 309 if (vtbl && vtbl->svt_len) {
35a4481c 310 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 311 save_magic(mgs_ix, sv);
a0d0e21e 312 /* omit MGf_GSKIP -- not changed here */
16c91539 313 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 314 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
315 return len;
316 }
317 }
318
bd8446cf 319 (void)SvPV_const(sv, len);
463ee0b2 320 return len;
79072805
LW
321}
322
8fb26106 323I32
864dbfa3 324Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
325{
326 MAGIC* mg;
ac27b0f5 327
7918f24d
NC
328 PERL_ARGS_ASSERT_MG_SIZE;
329
93965878 330 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 331 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 332 if (vtbl && vtbl->svt_len) {
35a4481c
AL
333 const I32 mgs_ix = SSNEW(sizeof(MGS));
334 I32 len;
455ece5e 335 save_magic(mgs_ix, sv);
93965878 336 /* omit MGf_GSKIP -- not changed here */
16c91539 337 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 338 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
339 return len;
340 }
341 }
342
343 switch(SvTYPE(sv)) {
344 case SVt_PVAV:
502c6561 345 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
346 case SVt_PVHV:
347 /* FIXME */
348 default:
cea2e8a9 349 Perl_croak(aTHX_ "Size magic not implemented");
93965878
NIS
350 break;
351 }
352 return 0;
353}
354
954c1994
GS
355/*
356=for apidoc mg_clear
357
358Clear something magical that the SV represents. See C<sv_magic>.
359
360=cut
361*/
362
79072805 363int
864dbfa3 364Perl_mg_clear(pTHX_ SV *sv)
79072805 365{
35a4481c 366 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 367 MAGIC* mg;
8ac77ac9 368 MAGIC *nextmg;
463ee0b2 369
7918f24d
NC
370 PERL_ARGS_ASSERT_MG_CLEAR;
371
455ece5e 372 save_magic(mgs_ix, sv);
463ee0b2 373
8ac77ac9 374 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 375 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 376 /* omit GSKIP -- never set here */
727405f8 377
8ac77ac9
NC
378 nextmg = mg->mg_moremagic; /* it may delete itself */
379
2b260de0 380 if (vtbl && vtbl->svt_clear)
16c91539 381 vtbl->svt_clear(aTHX_ sv, mg);
79072805 382 }
463ee0b2 383
8772537c 384 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
385 return 0;
386}
387
ed624ca8 388static MAGIC*
39de7f53
FR
389S_mg_findext_flags(pTHX_ const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
390{
391 PERL_UNUSED_CONTEXT;
392
393 assert(flags <= 1);
394
395 if (sv) {
396 MAGIC *mg;
397
7db6405c
FC
398 assert(!(SvTYPE(sv) == SVt_PVAV && AvPAD_NAMELIST(sv)));
399
39de7f53
FR
400 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
401 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
402 return mg;
403 }
404 }
405 }
406
407 return NULL;
408}
409
954c1994
GS
410/*
411=for apidoc mg_find
412
413Finds the magic pointer for type matching the SV. See C<sv_magic>.
414
415=cut
416*/
417
93a17b20 418MAGIC*
35a4481c 419Perl_mg_find(pTHX_ const SV *sv, int type)
93a17b20 420{
39de7f53
FR
421 return S_mg_findext_flags(aTHX_ sv, type, NULL, 0);
422}
423
424/*
425=for apidoc mg_findext
426
427Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
428C<sv_magicext>.
429
430=cut
431*/
432
433MAGIC*
434Perl_mg_findext(pTHX_ const SV *sv, int type, const MGVTBL *vtbl)
435{
436 return S_mg_findext_flags(aTHX_ sv, type, vtbl, 1);
93a17b20
LW
437}
438
96c2a8ff
FC
439MAGIC *
440Perl_mg_find_mglob(pTHX_ SV *sv)
441{
442 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
443 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
444 /* This sv is only a delegate. //g magic must be attached to
445 its target. */
446 vivify_defelem(sv);
447 sv = LvTARG(sv);
448 }
449 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
450 return S_mg_findext_flags(aTHX_ sv, PERL_MAGIC_regex_global, 0, 0);
451 return NULL;
452}
453
954c1994
GS
454/*
455=for apidoc mg_copy
456
457Copies the magic from one SV to another. See C<sv_magic>.
458
459=cut
460*/
461
79072805 462int
864dbfa3 463Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 464{
463ee0b2 465 int count = 0;
79072805 466 MAGIC* mg;
7918f24d
NC
467
468 PERL_ARGS_ASSERT_MG_COPY;
469
463ee0b2 470 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 471 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 472 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 473 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 474 }
823a54a3
AL
475 else {
476 const char type = mg->mg_type;
1e73acc8 477 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
478 sv_magic(nsv,
479 (type == PERL_MAGIC_tied)
480 ? SvTIED_obj(sv, mg)
481 : (type == PERL_MAGIC_regdata && mg->mg_obj)
482 ? sv
483 : mg->mg_obj,
484 toLOWER(type), key, klen);
485 count++;
486 }
79072805 487 }
79072805 488 }
463ee0b2 489 return count;
79072805
LW
490}
491
954c1994 492/*
0cbee0a4
DM
493=for apidoc mg_localize
494
9711599e
CS
495Copy some of the magic from an existing SV to new localized version of that
496SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
497taint, pos).
498
af7df257 499If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS
500This typically means that assignment will soon follow (e.g. 'local $x = $y'),
501and that will handle the magic.
0cbee0a4
DM
502
503=cut
504*/
505
506void
af7df257 507Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4 508{
97aff369 509 dVAR;
0cbee0a4 510 MAGIC *mg;
7918f24d
NC
511
512 PERL_ARGS_ASSERT_MG_LOCALIZE;
513
658a9f31
JD
514 if (nsv == DEFSV)
515 return;
516
0cbee0a4 517 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 518 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 519 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 520 continue;
0cbee0a4 521
a5063e7c 522 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 523 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 524 else
0cbee0a4
DM
525 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
526 mg->mg_ptr, mg->mg_len);
a5063e7c 527
0cbee0a4 528 /* container types should remain read-only across localization */
9ff3e6d8 529 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
530 }
531
532 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
533 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 534 if (setmagic) {
9711599e
CS
535 PL_localizing = 1;
536 SvSETMAGIC(nsv);
537 PL_localizing = 0;
538 }
0cbee0a4
DM
539 }
540}
541
d9088386
Z
542#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
543static void
544S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
545{
546 const MGVTBL* const vtbl = mg->mg_virtual;
547 if (vtbl && vtbl->svt_free)
548 vtbl->svt_free(aTHX_ sv, mg);
549 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
550 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
551 Safefree(mg->mg_ptr);
552 else if (mg->mg_len == HEf_SVKEY)
553 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
554 }
555 if (mg->mg_flags & MGf_REFCOUNTED)
556 SvREFCNT_dec(mg->mg_obj);
557 Safefree(mg);
558}
559
0cbee0a4 560/*
954c1994
GS
561=for apidoc mg_free
562
563Free any magic storage used by the SV. See C<sv_magic>.
564
565=cut
566*/
567
79072805 568int
864dbfa3 569Perl_mg_free(pTHX_ SV *sv)
79072805
LW
570{
571 MAGIC* mg;
572 MAGIC* moremagic;
7918f24d
NC
573
574 PERL_ARGS_ASSERT_MG_FREE;
575
79072805 576 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 577 moremagic = mg->mg_moremagic;
d9088386 578 mg_free_struct(sv, mg);
c826f41b 579 SvMAGIC_set(sv, moremagic);
79072805 580 }
b162af07 581 SvMAGIC_set(sv, NULL);
68f8932e 582 SvMAGICAL_off(sv);
79072805
LW
583 return 0;
584}
585
d9088386
Z
586/*
587=for apidoc Am|void|mg_free_type|SV *sv|int how
588
589Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
590
591=cut
592*/
593
594void
595Perl_mg_free_type(pTHX_ SV *sv, int how)
596{
597 MAGIC *mg, *prevmg, *moremg;
598 PERL_ARGS_ASSERT_MG_FREE_TYPE;
599 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
600 MAGIC *newhead;
601 moremg = mg->mg_moremagic;
602 if (mg->mg_type == how) {
603 /* temporarily move to the head of the magic chain, in case
604 custom free code relies on this historical aspect of mg_free */
605 if (prevmg) {
606 prevmg->mg_moremagic = moremg;
607 mg->mg_moremagic = SvMAGIC(sv);
608 SvMAGIC_set(sv, mg);
609 }
610 newhead = mg->mg_moremagic;
611 mg_free_struct(sv, mg);
612 SvMAGIC_set(sv, newhead);
613 mg = prevmg;
614 }
615 }
616 mg_magical(sv);
617}
618
79072805 619#include <signal.h>
79072805 620
942e002e 621U32
864dbfa3 622Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 623{
97aff369 624 dVAR;
8772537c 625 PERL_UNUSED_ARG(sv);
6cef1e77 626
7918f24d
NC
627 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
628
0bd48802 629 if (PL_curpm) {
eb578fdb 630 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 631 if (rx) {
a678b0e4
YO
632 if (mg->mg_obj) { /* @+ */
633 /* return the number possible */
07bc277f 634 return RX_NPARENS(rx);
a678b0e4 635 } else { /* @- */
07bc277f 636 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
637
638 /* return the last filled */
f46c4081 639 while ( paren >= 0
07bc277f
NC
640 && (RX_OFFS(rx)[paren].start == -1
641 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 642 paren--;
a678b0e4
YO
643 return (U32)paren;
644 }
0bd48802 645 }
8f580fb8 646 }
ac27b0f5 647
942e002e 648 return (U32)-1;
6cef1e77
IZ
649}
650
6502e081
DM
651/* @-, @+ */
652
6cef1e77 653int
864dbfa3 654Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 655{
97aff369 656 dVAR;
7918f24d
NC
657
658 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
659
0bd48802 660 if (PL_curpm) {
eb578fdb 661 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 662 if (rx) {
eb578fdb 663 const I32 paren = mg->mg_len;
a10eae29
FC
664 SSize_t s;
665 SSize_t t;
0bd48802
AL
666 if (paren < 0)
667 return 0;
07bc277f
NC
668 if (paren <= (I32)RX_NPARENS(rx) &&
669 (s = RX_OFFS(rx)[paren].start) != -1 &&
670 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 671 {
a10eae29 672 SSize_t i;
0bd48802
AL
673 if (mg->mg_obj) /* @+ */
674 i = t;
675 else /* @- */
676 i = s;
677
a10eae29 678 if (RX_MATCH_UTF8(rx)) {
07bc277f 679 const char * const b = RX_SUBBEG(rx);
0bd48802 680 if (b)
6502e081
DM
681 i = RX_SUBCOFFSET(rx) +
682 utf8_length((U8*)b,
683 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 684 }
727405f8 685
a10eae29 686 sv_setuv(sv, i);
232af1f8 687 return 0;
1aa99e6b 688 }
0bd48802 689 }
6cef1e77 690 }
232af1f8 691 sv_setsv(sv, NULL);
6cef1e77
IZ
692 return 0;
693}
694
6502e081
DM
695/* @-, @+ */
696
e4b89193 697int
a29d06ed
MG
698Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
699{
7918f24d 700 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
d4c19fe8
AL
701 PERL_UNUSED_ARG(sv);
702 PERL_UNUSED_ARG(mg);
cb077ed2 703 Perl_croak_no_modify();
0dbb1585 704 NORETURN_FUNCTION_END;
a29d06ed
MG
705}
706
ad3296c6 707#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
708 if (SvPOK(sv)) { \
709 STRLEN len = SvCUR(sv); \
710 char * const p = SvPVX(sv); \
8e6b4db6
PC
711 while (len > 0 && isSPACE(p[len-1])) \
712 --len; \
713 SvCUR_set(sv, len); \
714 p[len] = '\0'; \
715 } \
ad3296c6
SH
716} STMT_END
717
8b850bd5
NC
718void
719Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
720{
7918f24d
NC
721 PERL_ARGS_ASSERT_EMULATE_COP_IO;
722
8b850bd5
NC
723 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
724 sv_setsv(sv, &PL_sv_undef);
725 else {
726 sv_setpvs(sv, "");
727 SvUTF8_off(sv);
728 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 729 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
730 assert(value);
731 sv_catsv(sv, value);
732 }
733 sv_catpvs(sv, "\0");
734 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 735 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
736 assert(value);
737 sv_catsv(sv, value);
738 }
739 }
740}
741
25bbd826
CB
742#ifdef VMS
743#include <descrip.h>
744#include <starlet.h>
745#endif
746
79072805 747int
864dbfa3 748Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 749{
27da23d5 750 dVAR;
eb578fdb
KW
751 I32 paren;
752 const char *s = NULL;
753 REGEXP *rx;
823a54a3 754 const char * const remaining = mg->mg_ptr + 1;
e91d8259 755 char nextchar;
79072805 756
7918f24d
NC
757 PERL_ARGS_ASSERT_MAGIC_GET;
758
e91d8259 759 if (!mg->mg_ptr) {
e91d8259 760 paren = mg->mg_len;
e91d8259 761 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 762 do_numbuf_fetch:
e91d8259
NC
763 CALLREG_NUMBUF_FETCH(rx,paren,sv);
764 } else {
765 sv_setsv(sv,&PL_sv_undef);
766 }
767 return 0;
768 }
769
770 nextchar = *remaining;
79072805 771 switch (*mg->mg_ptr) {
748a9306 772 case '\001': /* ^A */
f2da823f
FC
773 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
774 else sv_setsv(sv, &PL_sv_undef);
125b9982
NT
775 if (SvTAINTED(PL_bodytarget))
776 SvTAINTED_on(sv);
748a9306 777 break;
e5218da5 778 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 779 if (nextchar == '\0') {
e5218da5
GA
780 sv_setiv(sv, (IV)PL_minus_c);
781 }
823a54a3 782 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
783 sv_setiv(sv, (IV)STATUS_NATIVE);
784 }
49460fe6
NIS
785 break;
786
79072805 787 case '\004': /* ^D */
aea4f609 788 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 789 break;
28f23441 790 case '\005': /* ^E */
6c6eab55
KW
791 if (nextchar != '\0') {
792 if (strEQ(remaining, "NCODING"))
793 sv_setsv(sv, PL_encoding);
4f4ff3a7 794 break;
6c6eab55 795 }
4f4ff3a7
KW
796
797#if defined(VMS) || defined(OS2) || defined(WIN32)
798# if defined(VMS)
0a378802 799 {
0a378802
JH
800 char msg[255];
801 $DESCRIPTOR(msgdsc,msg);
802 sv_setnv(sv,(NV) vaxc$errno);
803 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
804 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
805 else
76f68e9b 806 sv_setpvs(sv,"");
0a378802 807 }
4b645107 808#elif defined(OS2)
0a378802
JH
809 if (!(_emx_env & 0x200)) { /* Under DOS */
810 sv_setnv(sv, (NV)errno);
811 sv_setpv(sv, errno ? Strerror(errno) : "");
812 } else {
813 if (errno != errno_isOS2) {
823a54a3 814 const int tmp = _syserrno();
0a378802
JH
815 if (tmp) /* 2nd call to _syserrno() makes it 0 */
816 Perl_rc = tmp;
817 }
818 sv_setnv(sv, (NV)Perl_rc);
819 sv_setpv(sv, os2error(Perl_rc));
820 }
4f4ff3a7 821# elif defined(WIN32)
0a378802 822 {
d4c19fe8 823 const DWORD dwErr = GetLastError();
0a378802 824 sv_setnv(sv, (NV)dwErr);
823a54a3 825 if (dwErr) {
0a378802
JH
826 PerlProc_GetOSError(sv, dwErr);
827 }
828 else
76f68e9b 829 sv_setpvs(sv, "");
0a378802
JH
830 SetLastError(dwErr);
831 }
4f4ff3a7
KW
832# else
833# error Missing code for platform
834# endif
ad3296c6 835 SvRTRIM(sv);
0a378802 836 SvNOK_on(sv); /* what a wonderful hack! */
0a378802 837 break;
4f4ff3a7
KW
838#endif /* End of platforms with special handling for $^E; others just fall
839 through to $! */
46f3e16c
KW
840
841 case '!':
842 {
843 dSAVE_ERRNO;
844#ifdef VMS
845 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
846#else
847 sv_setnv(sv, (NV)errno);
848#endif
849#ifdef OS2
850 if (errno == errno_isOS2 || errno == errno_isOS2_set)
851 sv_setpv(sv, os2error(Perl_rc));
852 else
853#endif
854 if (! errno) {
855 sv_setpvs(sv, "");
856 }
857 else {
858
859 /* Strerror can return NULL on some platforms, which will result in
860 * 'sv' not being considered SvOK. The SvNOK_on() below will cause
861 * just the number part to be valid */
862 sv_setpv(sv, Strerror(errno));
863
864 /* In some locales the error string may come back as UTF-8, in
865 * which case we should turn on that flag. This didn't use to
866 * happen, and to avoid any possible backward compatibility issues,
867 * we don't turn on the flag unless we have to. So the flag stays
868 * off for an entirely ASCII string. We assume that if the string
869 * looks like UTF-8, it really is UTF-8: "text in any other
870 * encoding that uses bytes with the high bit set is extremely
871 * unlikely to pass a UTF-8 validity test"
872 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
873 * potential that we will get it wrong however, especially on short
874 * error message text. (If it turns out to be necessary, we could
875 * also keep track if the current LC_MESSAGES locale is UTF-8) */
876 if (SvOK(sv) /* It could be that Strerror returned invalid */
877 && ! is_ascii_string((U8*) SvPVX_const(sv), SvCUR(sv))
878 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
879 {
880 SvUTF8_on(sv);
881 }
882 }
883 RESTORE_ERRNO;
884 }
885
886 SvRTRIM(sv);
887 SvNOK_on(sv); /* what a wonderful hack! */
888 break;
889
79072805 890 case '\006': /* ^F */
3280af22 891 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 892 break;
9ebf26ad
FR
893 case '\007': /* ^GLOBAL_PHASE */
894 if (strEQ(remaining, "LOBAL_PHASE")) {
895 sv_setpvn(sv, PL_phase_names[PL_phase],
896 strlen(PL_phase_names[PL_phase]));
897 }
898 break;
a0d0e21e 899 case '\010': /* ^H */
3280af22 900 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 901 break;
9d116dd7 902 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 903 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 904 break;
8561ea1d
FC
905 case '\014': /* ^LAST_FH */
906 if (strEQ(remaining, "AST_FH")) {
907 if (PL_last_in_gv) {
908 assert(isGV_with_GP(PL_last_in_gv));
909 SV_CHECK_THINKFIRST_COW_DROP(sv);
910 prepare_SV_for_RV(sv);
911 SvOK_off(sv);
912 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
913 SvROK_on(sv);
914 sv_rvweaken(sv);
915 }
916 else sv_setsv_nomg(sv, NULL);
917 }
918 break;
ac27b0f5 919 case '\017': /* ^O & ^OPEN */
823a54a3 920 if (nextchar == '\0') {
ac27b0f5 921 sv_setpv(sv, PL_osname);
3511154c
DM
922 SvTAINTED_off(sv);
923 }
823a54a3 924 else if (strEQ(remaining, "PEN")) {
8b850bd5 925 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 926 }
28f23441 927 break;
9ebf26ad 928 case '\020':
a6d0b1b5 929 sv_setiv(sv, (IV)PL_perldb);
79072805 930 break;
fb73857a 931 case '\023': /* ^S */
a6d0b1b5 932 {
bc177e6b 933 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 934 SvOK_off(sv);
3280af22 935 else if (PL_in_eval)
6dc8a9e4 936 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
937 else
938 sv_setiv(sv, 0);
d58bf5aa 939 }
fb73857a 940 break;
79072805 941 case '\024': /* ^T */
823a54a3 942 if (nextchar == '\0') {
88e89b8a 943#ifdef BIG_TIME
7c36658b 944 sv_setnv(sv, PL_basetime);
88e89b8a 945#else
7c36658b 946 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 947#endif
7c36658b 948 }
823a54a3 949 else if (strEQ(remaining, "AINT"))
284167a5
SM
950 sv_setiv(sv, TAINTING_get
951 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 952 : 0);
7c36658b 953 break;
e07ea26a 954 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 955 if (strEQ(remaining, "NICODE"))
a05d7ebb 956 sv_setuv(sv, (UV) PL_unicode);
823a54a3 957 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 958 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
959 else if (strEQ(remaining, "TF8CACHE"))
960 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
961 break;
962 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 963 if (nextchar == '\0')
4438c4b7 964 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 965 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 966 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 967 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
968 }
969 else if (PL_compiling.cop_warnings == pWARN_STD) {
7e4f0450
FC
970 sv_setsv(sv, &PL_sv_undef);
971 break;
013b78e8 972 }
d3a7d8c7 973 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
974 /* Get the bit mask for $warnings::Bits{all}, because
975 * it could have been extended by warnings::register */
4bac9ae4
CS
976 HV * const bits = get_hv("warnings::Bits", 0);
977 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
978 if (bits_all)
979 sv_copypv(sv, *bits_all);
980 else
981 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 982 }
4438c4b7 983 else {
72dc9ed5
NC
984 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
985 *PL_compiling.cop_warnings);
ac27b0f5 986 }
4438c4b7 987 }
79072805 988 break;
79072805 989 case '+':
aaa362c4 990 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
991 paren = RX_LASTPAREN(rx);
992 if (paren)
993 goto do_numbuf_fetch;
79072805 994 }
3280af22 995 sv_setsv(sv,&PL_sv_undef);
79072805 996 break;
a01268b5
JH
997 case '\016': /* ^N */
998 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
999 paren = RX_LASTCLOSEPAREN(rx);
1000 if (paren)
1001 goto do_numbuf_fetch;
a01268b5
JH
1002 }
1003 sv_setsv(sv,&PL_sv_undef);
1004 break;
79072805 1005 case '.':
3280af22 1006 if (GvIO(PL_last_in_gv)) {
357c8808 1007 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1008 }
79072805
LW
1009 break;
1010 case '?':
809a5acc 1011 {
809a5acc 1012 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1013#ifdef COMPLEX_STATUS
41cb7b2b 1014 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1015 LvTARGOFF(sv) = PL_statusvalue;
1016 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1017#endif
809a5acc 1018 }
79072805
LW
1019 break;
1020 case '^':
acbe1b9d 1021 if (GvIOp(PL_defoutgv))
099be4f1 1022 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1023 if (s)
1024 sv_setpv(sv,s);
1025 else {
3280af22 1026 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1027 sv_catpvs(sv,"_TOP");
79072805
LW
1028 }
1029 break;
1030 case '~':
acbe1b9d 1031 if (GvIOp(PL_defoutgv))
0daa599b 1032 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1033 if (!s)
3280af22 1034 s = GvENAME(PL_defoutgv);
79072805
LW
1035 sv_setpv(sv,s);
1036 break;
79072805 1037 case '=':
099be4f1 1038 if (GvIO(PL_defoutgv))
0daa599b 1039 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1040 break;
1041 case '-':
099be4f1 1042 if (GvIO(PL_defoutgv))
0daa599b 1043 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1044 break;
1045 case '%':
099be4f1 1046 if (GvIO(PL_defoutgv))
0daa599b 1047 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1048 break;
79072805
LW
1049 case ':':
1050 break;
1051 case '/':
1052 break;
1053 case '[':
e1dccc0d 1054 sv_setiv(sv, 0);
79072805
LW
1055 break;
1056 case '|':
099be4f1 1057 if (GvIO(PL_defoutgv))
0daa599b 1058 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1059 break;
79072805 1060 case '\\':
b2ce0fda 1061 if (PL_ors_sv)
f28098ff 1062 sv_copypv(sv, PL_ors_sv);
4bac9ae4
CS
1063 else
1064 sv_setsv(sv, &PL_sv_undef);
79072805 1065 break;
0e219455 1066 case '$': /* $$ */
9cdac2a2
FC
1067 {
1068 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1069 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1070 /* never set manually, or at least not since last fork */
1071 sv_setiv(sv, pid);
19db9fb7
Z
1072 /* never unsafe, even if reading in a tainted expression */
1073 SvTAINTED_off(sv);
1074 }
9cdac2a2
FC
1075 /* else a value has been assigned manually, so do nothing */
1076 }
0e219455 1077 break;
79072805 1078 case '<':
dfff4baf 1079 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1080 break;
1081 case '>':
dfff4baf 1082 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1083 break;
1084 case '(':
dfff4baf 1085 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1086 goto add_groups;
1087 case ')':
dfff4baf 1088 sv_setgid(sv, PerlProc_getegid());
79072805 1089 add_groups:
79072805 1090#ifdef HAS_GETGROUPS
79072805 1091 {
57d7c65e 1092 Groups_t *gary = NULL;
fb45abb2 1093 I32 i, num_groups = getgroups(0, gary);
57d7c65e
JC
1094 Newx(gary, num_groups, Groups_t);
1095 num_groups = getgroups(num_groups, gary);
fb45abb2
GA
1096 for (i = 0; i < num_groups; i++)
1097 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
57d7c65e 1098 Safefree(gary);
79072805 1099 }
155aba94 1100 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1101#endif
79072805 1102 break;
79072805
LW
1103 case '0':
1104 break;
1105 }
a0d0e21e 1106 return 0;
79072805
LW
1107}
1108
1109int
864dbfa3 1110Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1111{
8772537c 1112 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1113
7918f24d
NC
1114 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1115
79072805 1116 if (uf && uf->uf_val)
24f81a43 1117 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1118 return 0;
1119}
1120
1121int
864dbfa3 1122Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1123{
27da23d5 1124 dVAR;
9ae3433d 1125 STRLEN len = 0, klen;
12033064 1126 const char * const key = MgPV_const(mg,klen);
888a67f6 1127 const char *s = "";
1e422769 1128
7918f24d
NC
1129 PERL_ARGS_ASSERT_MAGIC_SETENV;
1130
613c63b4 1131 SvGETMAGIC(sv);
12033064 1132 if (SvOK(sv)) {
613c63b4
CS
1133 /* defined environment variables are byte strings; unfortunately
1134 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1135 (void)SvPV_force_nomg_nolen(sv);
1136 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1137 if (SvUTF8(sv)) {
1138 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1139 SvUTF8_off(sv);
1140 }
1141 s = SvPVX(sv);
1142 len = SvCUR(sv);
12033064
CS
1143 }
1144 my_setenv(key, s); /* does the deed */
1145
a0d0e21e
LW
1146#ifdef DYNAMIC_ENV_FETCH
1147 /* We just undefd an environment var. Is a replacement */
1148 /* waiting in the wings? */
1149 if (!len) {
6bd66ee9 1150 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1151 if (valp)
4ab59fcc 1152 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1153 }
1154#endif
1e422769 1155
39e571d4 1156#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1157 /* And you'll never guess what the dog had */
1158 /* in its mouth... */
284167a5 1159 if (TAINTING_get) {
1e422769
PP
1160 MgTAINTEDDIR_off(mg);
1161#ifdef VMS
6bd66ee9 1162 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
b8ffc8df 1163 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1164 int i = 0, j = 0;
1165
6fca0082 1166 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1167 elt = eltbuf;
1e422769
PP
1168 do { /* DCL$PATH may be a search list */
1169 while (1) { /* as may dev portion of any element */
1170 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1171 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1172 cando_by_name(S_IWUSR,0,elt) ) {
1173 MgTAINTEDDIR_on(mg);
1174 return 0;
1175 }
1176 }
bd61b366 1177 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1178 *cp = '\0';
1179 if (my_trnlnm(elt, eltbuf, j++))
1180 elt = eltbuf;
1181 else
1182 break;
1183 }
1184 j = 0;
1185 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1186 }
1187#endif /* VMS */
12033064 1188 if (s && klen == 4 && strEQ(key,"PATH")) {
8772537c 1189 const char * const strend = s + len;
463ee0b2
LW
1190
1191 while (s < strend) {
96827780 1192 char tmpbuf[256];
c623ac67 1193 Stat_t st;
5f74f29c 1194 I32 i;
f5a63d97
AL
1195#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1196 const char path_sep = '|';
1197#else
1198 const char path_sep = ':';
1199#endif
96827780 1200 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1201 s, strend, path_sep, &i);
463ee0b2 1202 s++;
bb7a0f54 1203 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB
1204#ifdef VMS
1205 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1206#else
1207 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1208#endif
c6ed36e1 1209 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1210 MgTAINTEDDIR_on(mg);
1e422769
PP
1211 return 0;
1212 }
463ee0b2 1213 }
79072805
LW
1214 }
1215 }
39e571d4 1216#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1217
79072805
LW
1218 return 0;
1219}
1220
1221int
864dbfa3 1222Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1223{
7918f24d 1224 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1225 PERL_UNUSED_ARG(sv);
bd61b366 1226 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1227 return 0;
1228}
1229
88e89b8a 1230int
864dbfa3 1231Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1232{
97aff369 1233 dVAR;
7918f24d 1234 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1235 PERL_UNUSED_ARG(mg);
b0269e46 1236#if defined(VMS)
cea2e8a9 1237 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1238#else
3280af22 1239 if (PL_localizing) {
fb73857a 1240 HE* entry;
b0269e46 1241 my_clearenv();
85fbaab2
NC
1242 hv_iterinit(MUTABLE_HV(sv));
1243 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1244 I32 keylen;
1245 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1246 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1247 }
1248 }
1249#endif
1250 return 0;
1251}
1252
1253int
864dbfa3 1254Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1255{
27da23d5 1256 dVAR;
7918f24d 1257 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1258 PERL_UNUSED_ARG(sv);
1259 PERL_UNUSED_ARG(mg);
b0269e46
AB
1260#if defined(VMS)
1261 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1262#else
1263 my_clearenv();
1264#endif
3e3baf6d 1265 return 0;
66b1d557
HM
1266}
1267
64ca3a65 1268#ifndef PERL_MICRO
2d4fcd5e
AJ
1269#ifdef HAS_SIGPROCMASK
1270static void
1271restore_sigmask(pTHX_ SV *save_sv)
1272{
0bd48802 1273 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1274 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1275}
1276#endif
66b1d557 1277int
864dbfa3 1278Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1279{
97aff369 1280 dVAR;
88e89b8a 1281 /* Are we fetching a signal entry? */
708854f2 1282 int i = (I16)mg->mg_private;
7918f24d
NC
1283
1284 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1285
708854f2 1286 if (!i) {
84c7b88c
BF
1287 STRLEN siglen;
1288 const char * sig = MgPV_const(mg, siglen);
1289 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1290 }
1291
e02bfb16 1292 if (i > 0) {
22c35a8c
GS
1293 if(PL_psig_ptr[i])
1294 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1295 else {
46da273f 1296 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1297#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1298 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1299 sigstate = SIG_IGN;
2e34cc90
CL
1300#endif
1301#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1302 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1303 sigstate = SIG_DFL;
85b332e2 1304#endif
88e89b8a 1305 /* cache state so we don't fetch it again */
8aad04aa 1306 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1307 sv_setpvs(sv,"IGNORE");
88e89b8a 1308 else
3280af22 1309 sv_setsv(sv,&PL_sv_undef);
46da273f 1310 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1311 SvTEMP_off(sv);
1312 }
1313 }
1314 return 0;
1315}
1316int
864dbfa3 1317Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1318{
7918f24d 1319 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1320
38a124f0 1321 magic_setsig(NULL, mg);
179c85a2 1322 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1323}
3d37d572 1324
0a8e0eff 1325Signal_t
8aad04aa 1326#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1327Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1328#else
0a8e0eff 1329Perl_csighandler(int sig)
8aad04aa 1330#endif
0a8e0eff 1331{
1018e26f
NIS
1332#ifdef PERL_GET_SIG_CONTEXT
1333 dTHXa(PERL_GET_SIG_CONTEXT);
1334#else
85b332e2
CL
1335 dTHX;
1336#endif
23ada85b 1337#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1338 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1339 if (PL_sig_ignoring[sig]) return;
85b332e2 1340#endif
2e34cc90 1341#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1342 if (PL_sig_defaulting[sig])
2e34cc90
CL
1343#ifdef KILL_BY_SIGPRC
1344 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1345#else
1346 exit(1);
1347#endif
1348#endif
406878dd 1349 if (
853d2c32
RGS
1350#ifdef SIGILL
1351 sig == SIGILL ||
1352#endif
1353#ifdef SIGBUS
1354 sig == SIGBUS ||
1355#endif
1356#ifdef SIGSEGV
1357 sig == SIGSEGV ||
1358#endif
1359 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1360 /* Call the perl level handler now--
31c91b43 1361 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1362#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1363 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1364#else
1365 (*PL_sighandlerp)(sig);
92807b6d 1366#endif
406878dd 1367 else {
31c91b43 1368 if (!PL_psig_pend) return;
406878dd
GA
1369 /* Set a flag to say this signal is pending, that is awaiting delivery after
1370 * the current Perl opcode completes */
1371 PL_psig_pend[sig]++;
1372
1373#ifndef SIG_PENDING_DIE_COUNT
1374# define SIG_PENDING_DIE_COUNT 120
1375#endif
fe13d51d 1376 /* Add one to say _a_ signal is pending */
406878dd
GA
1377 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1378 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1379 (unsigned long)SIG_PENDING_DIE_COUNT);
1380 }
0a8e0eff
NIS
1381}
1382
2e34cc90
CL
1383#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1384void
1385Perl_csighandler_init(void)
1386{
1387 int sig;
27da23d5 1388 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1389
1390 for (sig = 1; sig < SIG_SIZE; sig++) {
1391#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1392 dTHX;
27da23d5 1393 PL_sig_defaulting[sig] = 1;
5c1546dc 1394 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1395#endif
1396#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1397 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1398#endif
1399 }
27da23d5 1400 PL_sig_handlers_initted = 1;
2e34cc90
CL
1401}
1402#endif
1403
7fe50b8b
LT
1404#if defined HAS_SIGPROCMASK
1405static void
1406unblock_sigmask(pTHX_ void* newset)
1407{
1408 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1409}
1410#endif
1411
0a8e0eff
NIS
1412void
1413Perl_despatch_signals(pTHX)
1414{
97aff369 1415 dVAR;
0a8e0eff
NIS
1416 int sig;
1417 PL_sig_pending = 0;
1418 for (sig = 1; sig < SIG_SIZE; sig++) {
1419 if (PL_psig_pend[sig]) {
d0166017 1420 dSAVE_ERRNO;
7fe50b8b 1421#ifdef HAS_SIGPROCMASK
55534442
LT
1422 /* From sigaction(2) (FreeBSD man page):
1423 * | Signal routines normally execute with the signal that
1424 * | caused their invocation blocked, but other signals may
1425 * | yet occur.
1426 * Emulation of this behavior (from within Perl) is enabled
1427 * using sigprocmask
1428 */
1429 int was_blocked;
1430 sigset_t newset, oldset;
1431
1432 sigemptyset(&newset);
1433 sigaddset(&newset, sig);
1434 sigprocmask(SIG_BLOCK, &newset, &oldset);
1435 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1436 if (!was_blocked) {
1437 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1438 ENTER;
1439 SAVEFREESV(save_sv);
1440 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1441 }
55534442 1442#endif
25da4428 1443 PL_psig_pend[sig] = 0;
6e324d09 1444#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1445 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1446#else
1447 (*PL_sighandlerp)(sig);
92807b6d 1448#endif
7fe50b8b 1449#ifdef HAS_SIGPROCMASK
55534442 1450 if (!was_blocked)
7fe50b8b 1451 LEAVE;
55534442 1452#endif
d0166017 1453 RESTORE_ERRNO;
0a8e0eff
NIS
1454 }
1455 }
1456}
1457
38a124f0 1458/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1459int
864dbfa3 1460Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1461{
27da23d5 1462 dVAR;
79072805 1463 I32 i;
cbbf8932 1464 SV** svp = NULL;
2d4fcd5e
AJ
1465 /* Need to be careful with SvREFCNT_dec(), because that can have side
1466 * effects (due to closures). We must make sure that the new disposition
1467 * is in place before it is called.
1468 */
cbbf8932 1469 SV* to_dec = NULL;
e72dc28c 1470 STRLEN len;
2d4fcd5e
AJ
1471#ifdef HAS_SIGPROCMASK
1472 sigset_t set, save;
1473 SV* save_sv;
1474#endif
eb578fdb 1475 const char *s = MgPV_const(mg,len);
7918f24d
NC
1476
1477 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1478
748a9306 1479 if (*s == '_') {
84c7b88c 1480 if (memEQs(s, len, "__DIE__"))
3280af22 1481 svp = &PL_diehook;
84c7b88c 1482 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1483 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1484 /* Merge the existing behaviours, which are as follows:
1485 magic_setsig, we always set svp to &PL_warnhook
1486 (hence we always change the warnings handler)
1487 For magic_clearsig, we don't change the warnings handler if it's
1488 set to the &PL_warnhook. */
3280af22 1489 svp = &PL_warnhook;
84c7b88c
BF
1490 } else if (sv) {
1491 SV *tmp = sv_newmortal();
1492 Perl_croak(aTHX_ "No such hook: %s",
1493 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1494 }
748a9306 1495 i = 0;
38a124f0 1496 if (svp && *svp) {
9289f461
RGS
1497 if (*svp != PERL_WARNHOOK_FATAL)
1498 to_dec = *svp;
cbbf8932 1499 *svp = NULL;
4633a7c4 1500 }
748a9306
LW
1501 }
1502 else {
708854f2
NC
1503 i = (I16)mg->mg_private;
1504 if (!i) {
84c7b88c 1505 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1506 mg->mg_private = (U16)i;
708854f2 1507 }
86d86cad 1508 if (i <= 0) {
84c7b88c
BF
1509 if (sv) {
1510 SV *tmp = sv_newmortal();
1511 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1512 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1513 }
748a9306
LW
1514 return 0;
1515 }
2d4fcd5e
AJ
1516#ifdef HAS_SIGPROCMASK
1517 /* Avoid having the signal arrive at a bad time, if possible. */
1518 sigemptyset(&set);
1519 sigaddset(&set,i);
1520 sigprocmask(SIG_BLOCK, &set, &save);
1521 ENTER;
9ff8e806 1522 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1523 SAVEFREESV(save_sv);
1524 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1525#endif
1526 PERL_ASYNC_CHECK();
2e34cc90 1527#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1528 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1529#endif
23ada85b 1530#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1531 PL_sig_ignoring[i] = 0;
85b332e2 1532#endif
2e34cc90 1533#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1534 PL_sig_defaulting[i] = 0;
2e34cc90 1535#endif
2d4fcd5e 1536 to_dec = PL_psig_ptr[i];
38a124f0
NC
1537 if (sv) {
1538 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1539 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1540
1541 /* Signals don't change name during the program's execution, so once
1542 they're cached in the appropriate slot of PL_psig_name, they can
1543 stay there.
1544
1545 Ideally we'd find some way of making SVs at (C) compile time, or
1546 at least, doing most of the work. */
1547 if (!PL_psig_name[i]) {
1548 PL_psig_name[i] = newSVpvn(s, len);
1549 SvREADONLY_on(PL_psig_name[i]);
1550 }
38a124f0 1551 } else {
79fd3822 1552 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1553 PL_psig_name[i] = NULL;
1554 PL_psig_ptr[i] = NULL;
1555 }
748a9306 1556 }
38a124f0 1557 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1558 if (i) {
5c1546dc 1559 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1560 }
748a9306 1561 else
b37c2d43 1562 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1563 } else {
9dfa190b
NC
1564 if (sv && SvOK(sv)) {
1565 s = SvPV_force(sv, len);
1566 } else {
1567 sv = NULL;
1568 }
84c7b88c 1569 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1570 if (i) {
23ada85b 1571#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1572 PL_sig_ignoring[i] = 1;
1573 (void)rsignal(i, PL_csighandlerp);
85b332e2 1574#else
9dfa190b 1575 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1576#endif
9dfa190b 1577 }
2d4fcd5e 1578 }
84c7b88c 1579 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1580 if (i) {
2e34cc90 1581#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1582 PL_sig_defaulting[i] = 1;
1583 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1584#else
9dfa190b 1585 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1586#endif
9dfa190b
NC
1587 }
1588 }
1589 else {
1590 /*
1591 * We should warn if HINT_STRICT_REFS, but without
1592 * access to a known hint bit in a known OP, we can't
1593 * tell whether HINT_STRICT_REFS is in force or not.
1594 */
1595 if (!strchr(s,':') && !strchr(s,'\''))
1596 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1597 SV_GMAGIC);
1598 if (i)
1599 (void)rsignal(i, PL_csighandlerp);
1600 else
1601 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1602 }
748a9306 1603 }
9dfa190b 1604
2d4fcd5e
AJ
1605#ifdef HAS_SIGPROCMASK
1606 if(i)
1607 LEAVE;
1608#endif
ef8d46e8 1609 SvREFCNT_dec(to_dec);
79072805
LW
1610 return 0;
1611}
64ca3a65 1612#endif /* !PERL_MICRO */
79072805
LW
1613
1614int
864dbfa3 1615Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1616{
97aff369 1617 dVAR;
7918f24d 1618 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1619 PERL_UNUSED_ARG(sv);
e1a479c5 1620
89c14e2e 1621 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1622 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1623 return 0;
1624
0e446081 1625 return magic_clearisa(NULL, mg);
463ee0b2
LW
1626}
1627
0e446081 1628/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1629int
52b45067
RD
1630Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1631{
1632 dVAR;
1633 HV* stash;
1634
7918f24d
NC
1635 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1636
52b45067 1637 /* Bail out if destruction is going on */
627364f1 1638 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1639
0e446081
NC
1640 if (sv)
1641 av_clear(MUTABLE_AV(sv));
52b45067 1642
6624142a
FC
1643 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1644 /* This occurs with setisa_elem magic, which calls this
1645 same function. */
1646 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1647
1648 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1649 SV **svp = AvARRAY((AV *)mg->mg_obj);
1650 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1651 while (items--) {
1652 stash = GvSTASH((GV *)*svp++);
1653 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1654 }
1655
1656 return 0;
1657 }
1658
52b45067 1659 stash = GvSTASH(
6624142a 1660 (const GV *)mg->mg_obj
52b45067
RD
1661 );
1662
00169e2c
FC
1663 /* The stash may have been detached from the symbol table, so check its
1664 name before doing anything. */
1665 if (stash && HvENAME_get(stash))
5562fa71 1666 mro_isa_changed_in(stash);
52b45067
RD
1667
1668 return 0;
1669}
1670
1671int
864dbfa3 1672Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1673{
85fbaab2 1674 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1675 I32 i = 0;
7918f24d
NC
1676
1677 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1678 PERL_UNUSED_ARG(mg);
7719e241 1679
6ff81951 1680 if (hv) {
497b47a8 1681 (void) hv_iterinit(hv);
ad64d0ec 1682 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1683 i = HvUSEDKEYS(hv);
497b47a8
JH
1684 else {
1685 while (hv_iternext(hv))
1686 i++;
1687 }
6ff81951
GS
1688 }
1689
1690 sv_setiv(sv, (IV)i);
1691 return 0;
1692}
1693
1694int
864dbfa3 1695Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1696{
7918f24d 1697 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1698 PERL_UNUSED_ARG(mg);
946ec16e 1699 if (LvTARG(sv)) {
85fbaab2 1700 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1701 }
1702 return 0;
ac27b0f5 1703}
946ec16e 1704
efaf3674
DM
1705/*
1706=for apidoc magic_methcall
1707
1708Invoke a magic method (like FETCH).
1709
2baee27b
FC
1710C<sv> and C<mg> are the tied thingy and the tie magic.
1711
1712C<meth> is the name of the method to call.
1713
1714C<argc> is the number of args (in addition to $self) to pass to the method.
1715
1716The C<flags> can be:
1717
1718 G_DISCARD invoke method with G_DISCARD flag and don't
1719 return a value
1720 G_UNDEF_FILL fill the stack with argc pointers to
1721 PL_sv_undef
1722
1723The arguments themselves are any values following the C<flags> argument.
efaf3674
DM
1724
1725Returns the SV (if any) returned by the method, or NULL on failure.
1726
1727
1728=cut
1729*/
1730
1731SV*
36925d9e 1732Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1733 U32 argc, ...)
a0d0e21e 1734{
97aff369 1735 dVAR;
a0d0e21e 1736 dSP;
efaf3674 1737 SV* ret = NULL;
463ee0b2 1738
7918f24d
NC
1739 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1740
efaf3674 1741 ENTER;
d1d7a15d
NC
1742
1743 if (flags & G_WRITING_TO_STDERR) {
1744 SAVETMPS;
1745
1746 save_re_context();
1747 SAVESPTR(PL_stderrgv);
1748 PL_stderrgv = NULL;
1749 }
1750
efaf3674 1751 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1752 PUSHMARK(SP);
efaf3674 1753
67549bd2
NC
1754 EXTEND(SP, argc+1);
1755 PUSHs(SvTIED_obj(sv, mg));
1756 if (flags & G_UNDEF_FILL) {
1757 while (argc--) {
efaf3674 1758 PUSHs(&PL_sv_undef);
93965878 1759 }
67549bd2 1760 } else if (argc > 0) {
046b0c7d
NC
1761 va_list args;
1762 va_start(args, argc);
1763
1764 do {
1765 SV *const sv = va_arg(args, SV *);
1766 PUSHs(sv);
1767 } while (--argc);
1768
1769 va_end(args);
88e89b8a 1770 }
463ee0b2 1771 PUTBACK;
efaf3674 1772 if (flags & G_DISCARD) {
36925d9e 1773 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1774 }
1775 else {
36925d9e 1776 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1777 ret = *PL_stack_sp--;
1778 }
1779 POPSTACK;
d1d7a15d
NC
1780 if (flags & G_WRITING_TO_STDERR)
1781 FREETMPS;
efaf3674
DM
1782 LEAVE;
1783 return ret;
1784}
1785
efaf3674 1786/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1787
efaf3674 1788STATIC SV*
36925d9e 1789S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1790 int n, SV *val)
1791{
1792 dVAR;
1793 SV* arg1 = NULL;
1794
1795 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1796
1797 if (mg->mg_ptr) {
1798 if (mg->mg_len >= 0) {
db4b3a1d 1799 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1800 }
1801 else if (mg->mg_len == HEf_SVKEY)
1802 arg1 = MUTABLE_SV(mg->mg_ptr);
1803 }
1804 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1805 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1806 sv_2mortal(arg1);
1807 }
1808 if (!arg1) {
046b0c7d 1809 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1810 }
046b0c7d 1811 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1812}
1813
76e3520e 1814STATIC int
36925d9e 1815S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1816{
efaf3674
DM
1817 dVAR;
1818 SV* ret;
463ee0b2 1819
7918f24d
NC
1820 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1821
efaf3674
DM
1822 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1823 if (ret)
1824 sv_setsv(sv, ret);
a0d0e21e
LW
1825 return 0;
1826}
463ee0b2 1827
a0d0e21e 1828int
864dbfa3 1829Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1830{
7918f24d
NC
1831 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1832
fd69380d 1833 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1834 mg->mg_flags |= MGf_GSKIP;
36925d9e 1835 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1836 return 0;
1837}
1838
1839int
864dbfa3 1840Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1841{
efaf3674 1842 dVAR;
b112cff9
DM
1843 MAGIC *tmg;
1844 SV *val;
7918f24d
NC
1845
1846 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1847
b112cff9
DM
1848 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1849 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1850 * public flags indicate its value based on copying from $val. Doing
1851 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1852 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1853 * wrong if $val happened to be tainted, as sv hasn't got magic
1854 * enabled, even though taint magic is in the chain. In which case,
1855 * fake up a temporary tainted value (this is easier than temporarily
1856 * re-enabling magic on sv). */
1857
284167a5 1858 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
1859 && (tmg->mg_len & 1))
1860 {
1861 val = sv_mortalcopy(sv);
1862 SvTAINTED_on(val);
1863 }
1864 else
1865 val = sv;
1866
36925d9e 1867 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
1868 return 0;
1869}
1870
1871int
864dbfa3 1872Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1873{
7918f24d
NC
1874 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1875
4c13be3f 1876 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1877 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1878}
463ee0b2 1879
93965878
NIS
1880
1881U32
864dbfa3 1882Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1883{
efaf3674 1884 dVAR;
22846ab4 1885 I32 retval = 0;
efaf3674 1886 SV* retsv;
93965878 1887
7918f24d
NC
1888 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1889
36925d9e 1890 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
1891 if (retsv) {
1892 retval = SvIV(retsv)-1;
22846ab4
AB
1893 if (retval < -1)
1894 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1895 }
22846ab4 1896 return (U32) retval;
93965878
NIS
1897}
1898
cea2e8a9
GS
1899int
1900Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1901{
efaf3674 1902 dVAR;
463ee0b2 1903
7918f24d
NC
1904 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1905
36925d9e 1906 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
1907 return 0;
1908}
1909
1910int
864dbfa3 1911Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1912{
efaf3674
DM
1913 dVAR;
1914 SV* ret;
463ee0b2 1915
7918f24d
NC
1916 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1917
36925d9e
RZ
1918 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1919 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
1920 if (ret)
1921 sv_setsv(key,ret);
79072805
LW
1922 return 0;
1923}
1924
1925int
1146e912 1926Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1927{
7918f24d
NC
1928 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1929
36925d9e 1930 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1931}
a0d0e21e 1932
a3bcc51e
TP
1933SV *
1934Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1935{
efaf3674 1936 dVAR;
5fcbf73d 1937 SV *retval;
ad64d0ec
NC
1938 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1939 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1940
7918f24d
NC
1941 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1942
a3bcc51e
TP
1943 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1944 SV *key;
bfcb3514 1945 if (HvEITER_get(hv))
a3bcc51e
TP
1946 /* we are in an iteration so the hash cannot be empty */
1947 return &PL_sv_yes;
1948 /* no xhv_eiter so now use FIRSTKEY */
1949 key = sv_newmortal();
ad64d0ec 1950 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1951 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
1952 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1953 }
1954
1955 /* there is a SCALAR method that we can call */
36925d9e 1956 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 1957 if (!retval)
5fcbf73d 1958 retval = &PL_sv_undef;
a3bcc51e
TP
1959 return retval;
1960}
1961
a0d0e21e 1962int
864dbfa3 1963Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1964{
97aff369 1965 dVAR;
089b5c60 1966 SV **svp;
7918f24d
NC
1967
1968 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1969
089b5c60
NC
1970 /* The magic ptr/len for the debugger's hash should always be an SV. */
1971 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
1972 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
7b0eb0b8 1973 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
1974 }
1975
1976 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
1977 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
1978 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
1979 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 1980
8772537c
AL
1981 if (svp && SvIOKp(*svp)) {
1982 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1983 if (o) {
7bbbc3c0
NC
1984#ifdef PERL_DEBUG_READONLY_OPS
1985 Slab_to_rw(OpSLAB(o));
1986#endif
8772537c 1987 /* set or clear breakpoint in the relevant control op */
089b5c60 1988 if (SvTRUE(sv))
8772537c
AL
1989 o->op_flags |= OPf_SPECIAL;
1990 else
1991 o->op_flags &= ~OPf_SPECIAL;
7bbbc3c0
NC
1992#ifdef PERL_DEBUG_READONLY_OPS
1993 Slab_to_ro(OpSLAB(o));
1994#endif
8772537c 1995 }
5df8de69 1996 }
79072805
LW
1997 return 0;
1998}
1999
2000int
8772537c 2001Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2002{
97aff369 2003 dVAR;
502c6561 2004 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2005
2006 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2007
83bf042f 2008 if (obj) {
e1dccc0d 2009 sv_setiv(sv, AvFILL(obj));
83bf042f 2010 } else {
d4a823b3 2011 sv_setsv(sv, NULL);
83bf042f 2012 }
79072805
LW
2013 return 0;
2014}
2015
2016int
864dbfa3 2017Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2018{
97aff369 2019 dVAR;
502c6561 2020 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2021
2022 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2023
83bf042f 2024 if (obj) {
e1dccc0d 2025 av_fill(obj, SvIV(sv));
83bf042f 2026 } else {
a2a5de95
NC
2027 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2028 "Attempt to set length of freed array");
83bf042f
NC
2029 }
2030 return 0;
2031}
2032
2033int
83f29afa
VP
2034Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2035{
2036 dVAR;
2037
2038 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2039 PERL_UNUSED_ARG(sv);
2040
2041 /* Reset the iterator when the array is cleared */
3565fbf3
VP
2042#if IVSIZE == I32SIZE
2043 *((IV *) &(mg->mg_len)) = 0;
2044#else
83f29afa
VP
2045 if (mg->mg_ptr)
2046 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2047#endif
83f29afa
VP
2048
2049 return 0;
2050}
2051
2052int
83bf042f
NC
2053Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2054{
97aff369 2055 dVAR;
7918f24d
NC
2056
2057 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2058 PERL_UNUSED_ARG(sv);
7918f24d 2059
94f3782b
DM
2060 /* during global destruction, mg_obj may already have been freed */
2061 if (PL_in_clean_all)
1ea47f64 2062 return 0;
94f3782b 2063
83bf042f
NC
2064 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2065
2066 if (mg) {
2067 /* arylen scalar holds a pointer back to the array, but doesn't own a
2068 reference. Hence the we (the array) are about to go away with it
2069 still pointing at us. Clear its pointer, else it would be pointing
2070 at free memory. See the comment in sv_magic about reference loops,
2071 and why it can't own a reference to us. */
2072 mg->mg_obj = 0;
2073 }
a0d0e21e
LW
2074 return 0;
2075}
2076
2077int
864dbfa3 2078Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2079{
97aff369 2080 dVAR;
16eb5365 2081 SV* const lsv = LvTARG(sv);
96c2a8ff 2082 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2083
2084 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2085 PERL_UNUSED_ARG(mg);
ac27b0f5 2086
6174b39a
FC
2087 if (found && found->mg_len != -1) {
2088 STRLEN i = found->mg_len;
25fdce4a 2089 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2090 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2091 sv_setuv(sv, i);
a0d0e21e 2092 return 0;
a0d0e21e 2093 }
35995e5c 2094 sv_setsv(sv,NULL);
a0d0e21e
LW
2095 return 0;
2096}
2097
2098int
864dbfa3 2099Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2100{
97aff369 2101 dVAR;
16eb5365 2102 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2103 SSize_t pos;
2104 STRLEN len;
c00206c8 2105 STRLEN ulen = 0;
53d44271 2106 MAGIC* found;
aec43834 2107 const char *s;
a0d0e21e 2108
7918f24d 2109 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2110 PERL_UNUSED_ARG(mg);
ac27b0f5 2111
96c2a8ff 2112 found = mg_find_mglob(lsv);
3881461a 2113 if (!found) {
a0d0e21e
LW
2114 if (!SvOK(sv))
2115 return 0;
96c2a8ff 2116 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2117 }
2118 else if (!SvOK(sv)) {
3881461a 2119 found->mg_len = -1;
a0d0e21e
LW
2120 return 0;
2121 }
aec43834 2122 s = SvPV_const(lsv, len);
a0d0e21e 2123
e1dccc0d 2124 pos = SvIV(sv);
a0ed51b3 2125
7e2040f0 2126 if (DO_UTF8(lsv)) {
aec43834 2127 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2128 if (ulen)
2129 len = ulen;
a0ed51b3
LW
2130 }
2131
a0d0e21e
LW
2132 if (pos < 0) {
2133 pos += len;
2134 if (pos < 0)
2135 pos = 0;
2136 }
eb160463 2137 else if (pos > (SSize_t)len)
a0d0e21e 2138 pos = len;
a0ed51b3 2139
3881461a 2140 found->mg_len = pos;
25fdce4a 2141 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2142
79072805
LW
2143 return 0;
2144}
2145
2146int
864dbfa3 2147Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2148{
2149 STRLEN len;
35a4481c 2150 SV * const lsv = LvTARG(sv);
b83604b4 2151 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2152 STRLEN offs = LvTARGOFF(sv);
2153 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC
2154 const bool negoff = LvFLAGS(sv) & 1;
2155 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC
2156
2157 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2158 PERL_UNUSED_ARG(mg);
6ff81951 2159
83f78d1a 2160 if (!translate_substr_offsets(
4ddea69a 2161 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2162 negoff ? -(IV)offs : (IV)offs, !negoff,
2163 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2164 )) {
2165 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2166 sv_setsv_nomg(sv, &PL_sv_undef);
2167 return 0;
2168 }
2169
9aa983d2 2170 if (SvUTF8(lsv))
4ddea69a 2171 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2172 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2173 if (SvUTF8(lsv))
2ef4b674 2174 SvUTF8_on(sv);
6ff81951
GS
2175 return 0;
2176}
2177
2178int
864dbfa3 2179Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2180{
97aff369 2181 dVAR;
83f78d1a 2182 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2183 const char * const tmps = SvPV_const(sv, len);
dd374669 2184 SV * const lsv = LvTARG(sv);
777f7c56
EB
2185 STRLEN lvoff = LvTARGOFF(sv);
2186 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC
2187 const bool negoff = LvFLAGS(sv) & 1;
2188 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC
2189
2190 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2191 PERL_UNUSED_ARG(mg);
075a4a2b 2192
a74fb2cd
FC
2193 SvGETMAGIC(lsv);
2194 if (SvROK(lsv))
2195 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2196 "Attempt to use reference as lvalue in substr"
2197 );
fc061ed8
FC
2198 SvPV_force_nomg(lsv,lsv_len);
2199 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2200 if (!translate_substr_offsets(
2201 lsv_len,
2202 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2203 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2204 ))
2205 Perl_croak(aTHX_ "substr outside of string");
2206 oldtarglen = lvlen;
1aa99e6b 2207 if (DO_UTF8(sv)) {
73a087f0 2208 sv_utf8_upgrade_nomg(lsv);
d931b1be 2209 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2210 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2211 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2212 SvUTF8_on(lsv);
2213 }
0d336106 2214 else if (SvUTF8(lsv)) {
5fcbf73d 2215 const char *utf8;
d931b1be 2216 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2217 newtarglen = len;
5fcbf73d 2218 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2219 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2220 Safefree(utf8);
1aa99e6b 2221 }
b76f3ce2 2222 else {
a74fb2cd 2223 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2224 newtarglen = len;
b76f3ce2 2225 }
83f78d1a
FC
2226 if (!neglen) LvTARGLEN(sv) = newtarglen;
2227 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2228
79072805
LW
2229 return 0;
2230}
2231
2232int
864dbfa3 2233Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2234{
97aff369 2235 dVAR;
7918f24d
NC
2236
2237 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2238 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2239#ifdef NO_TAINT_SUPPORT
2240 PERL_UNUSED_ARG(mg);
2241#endif
7918f24d 2242
27cc343c 2243 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW
2244 return 0;
2245}
2246
2247int
864dbfa3 2248Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2249{
97aff369 2250 dVAR;
7918f24d
NC
2251
2252 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2253 PERL_UNUSED_ARG(sv);
7918f24d 2254
b01e650a 2255 /* update taint status */
284167a5 2256 if (TAINT_get)
b01e650a
DM
2257 mg->mg_len |= 1;
2258 else
2259 mg->mg_len &= ~1;
463ee0b2
LW
2260 return 0;
2261}
2262
2263int
864dbfa3 2264Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2265{
35a4481c 2266 SV * const lsv = LvTARG(sv);
7918f24d
NC
2267
2268 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2269 PERL_UNUSED_ARG(mg);
6ff81951 2270
2e9e14dd 2271 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2272
6ff81951
GS
2273 return 0;
2274}
2275
2276int
864dbfa3 2277Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2278{
7918f24d 2279 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2280 PERL_UNUSED_ARG(mg);
79072805
LW
2281 do_vecset(sv); /* XXX slurp this routine */
2282 return 0;
2283}
2284
13733cde
FC
2285SV *
2286Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2287{
97aff369 2288 dVAR;
a0714e2c 2289 SV *targ = NULL;
13733cde
FC
2290 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2291 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2292 assert(mg);
5f05dabc 2293 if (LvTARGLEN(sv)) {
68dc0745 2294 if (mg->mg_obj) {
8772537c 2295 SV * const ahv = LvTARG(sv);
85fbaab2 2296 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2297 if (he)
2298 targ = HeVAL(he);
68dc0745 2299 }
bbfdc870 2300 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2301 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2302 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2303 {
2304 if (SvRMAGICAL(av)) {
2305 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2306 targ = svp ? *svp : NULL;
2307 }
2308 else
bbfdc870 2309 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2310 }
68dc0745 2311 }
46da273f 2312 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2313 /* somebody else defined it for us */
2314 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2315 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2316 LvTARGLEN(sv) = 0;
2317 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2318 mg->mg_obj = NULL;
68dc0745
PP
2319 mg->mg_flags &= ~MGf_REFCOUNTED;
2320 }
13733cde 2321 return targ;
5f05dabc 2322 }
71be2cbc 2323 else
13733cde
FC
2324 return LvTARG(sv);
2325}
2326
2327int
2328Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2329{
2330 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2331
2332 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2333 return 0;
2334}
2335
2336int
864dbfa3 2337Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2338{
7918f24d 2339 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2340 PERL_UNUSED_ARG(mg);
71be2cbc 2341 if (LvTARGLEN(sv))
68dc0745
PP
2342 vivify_defelem(sv);
2343 if (LvTARG(sv)) {
5f05dabc 2344 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2345 SvSETMAGIC(LvTARG(sv));
2346 }
5f05dabc
PP
2347 return 0;
2348}
2349
71be2cbc 2350void
864dbfa3 2351Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2352{
97aff369 2353 dVAR;
74e13ce4 2354 MAGIC *mg;
a0714e2c 2355 SV *value = NULL;
71be2cbc 2356
7918f24d
NC
2357 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2358
14befaf4 2359 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2360 return;
68dc0745 2361 if (mg->mg_obj) {
8772537c 2362 SV * const ahv = LvTARG(sv);
85fbaab2 2363 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2364 if (he)
2365 value = HeVAL(he);
3280af22 2366 if (!value || value == &PL_sv_undef)
be2597df 2367 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2368 }
bbfdc870
FC
2369 else if (LvSTARGOFF(sv) < 0)
2370 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2371 else {
502c6561 2372 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2373 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2374 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2375 else {
bbfdc870 2376 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2377 if (!svp || !(value = *svp))
bbfdc870 2378 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2379 }
2380 }
b37c2d43 2381 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2382 SvREFCNT_dec(LvTARG(sv));
2383 LvTARG(sv) = value;
71be2cbc 2384 LvTARGLEN(sv) = 0;
68dc0745 2385 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2386 mg->mg_obj = NULL;
68dc0745 2387 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2388}
2389
2390int
864dbfa3 2391Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2392{
7918f24d 2393 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2394 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2395 return 0;
810b8aa5
GS
2396}
2397
2398int
864dbfa3 2399Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2400{
7918f24d 2401 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2402 PERL_UNUSED_CONTEXT;
0177730e 2403 PERL_UNUSED_ARG(sv);
565764a8 2404 mg->mg_len = -1;
93a17b20
LW
2405 return 0;
2406}
2407
2408int
864dbfa3 2409Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2410{
35a4481c 2411 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2412
7918f24d
NC
2413 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2414
79072805 2415 if (uf && uf->uf_set)
24f81a43 2416 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2417 return 0;
2418}
2419
c277df42 2420int
faf82a0b
AE
2421Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2422{
488344d2 2423 const char type = mg->mg_type;
7918f24d
NC
2424
2425 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2426
488344d2
NC
2427 if (type == PERL_MAGIC_qr) {
2428 } else if (type == PERL_MAGIC_bm) {
2429 SvTAIL_off(sv);
2430 SvVALID_off(sv);
2431 } else {
2432 assert(type == PERL_MAGIC_fm);
488344d2
NC
2433 }
2434 return sv_unmagic(sv, type);
faf82a0b
AE
2435}
2436
7a4c00b4 2437#ifdef USE_LOCALE_COLLATE
79072805 2438int
864dbfa3 2439Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2440{
7918f24d
NC
2441 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2442
bbce6d69 2443 /*
838b5b74 2444 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2445 * and vanished with a faint plop.
2446 */
96a5add6 2447 PERL_UNUSED_CONTEXT;
8772537c 2448 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2449 if (mg->mg_ptr) {
2450 Safefree(mg->mg_ptr);
2451 mg->mg_ptr = NULL;
565764a8 2452 mg->mg_len = -1;
7a4c00b4 2453 }
bbce6d69
PP
2454 return 0;
2455}
7a4c00b4 2456#endif /* USE_LOCALE_COLLATE */
bbce6d69 2457
7e8c5dac
HS
2458/* Just clear the UTF-8 cache data. */
2459int
2460Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2461{
7918f24d 2462 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2463 PERL_UNUSED_CONTEXT;
8772537c 2464 PERL_UNUSED_ARG(sv);
7e8c5dac 2465 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2466 mg->mg_ptr = NULL;
7e8c5dac
HS
2467 mg->mg_len = -1; /* The mg_len holds the len cache. */
2468 return 0;
2469}
2470
bbce6d69 2471int
864dbfa3 2472Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2473{
97aff369 2474 dVAR;
eb578fdb
KW
2475 const char *s;
2476 I32 paren;
2477 const REGEXP * rx;
79072805 2478 I32 i;
8990e307 2479 STRLEN len;
125b9982 2480 MAGIC *tmg;
2fdbfb4d 2481
7918f24d
NC
2482 PERL_ARGS_ASSERT_MAGIC_SET;
2483
e91d8259 2484 if (!mg->mg_ptr) {
960b831f 2485 paren = mg->mg_len;
1e05feb3 2486 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2487 setparen_got_rx:
2fdbfb4d 2488 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2489 } else {
2fdbfb4d
AB
2490 /* Croak with a READONLY error when a numbered match var is
2491 * set without a previous pattern match. Unless it's C<local $1>
2492 */
e91d8259 2493 croakparen:
2fdbfb4d 2494 if (!PL_localizing) {
cb077ed2 2495 Perl_croak_no_modify();
2fdbfb4d
AB
2496 }
2497 }
e91d8259
NC
2498 return 0;
2499 }
2500
2501 switch (*mg->mg_ptr) {
748a9306 2502 case '\001': /* ^A */
f2da823f
FC
2503 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2504 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2505 FmLINES(PL_bodytarget) = 0;
2506 if (SvPOK(PL_bodytarget)) {
2507 char *s = SvPVX(PL_bodytarget);
2508 while ( ((s = strchr(s, '\n'))) ) {
2509 FmLINES(PL_bodytarget)++;
2510 s++;
2511 }
2512 }
125b9982 2513 /* mg_set() has temporarily made sv non-magical */
284167a5 2514 if (TAINTING_get) {
125b9982
NT
2515 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2516 SvTAINTED_on(PL_bodytarget);
2517 else
2518 SvTAINTED_off(PL_bodytarget);
2519 }
748a9306 2520 break;
49460fe6 2521 case '\003': /* ^C */
f2338a2e 2522 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2523 break;
2524
79072805 2525 case '\004': /* ^D */
b4ab917c 2526#ifdef DEBUGGING
b83604b4 2527 s = SvPV_nolen_const(sv);
ddcf8bc1 2528 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS
2529 if (DEBUG_x_TEST || DEBUG_B_TEST)
2530 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2531#else
38ab35f8 2532 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2533#endif
79072805 2534 break;
28f23441 2535 case '\005': /* ^E */
d0063567 2536 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2537#ifdef VMS
38ab35f8 2538 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2539#else
2540# ifdef WIN32
d0063567 2541 SetLastError( SvIV(sv) );
e37778c2
NC
2542# else
2543# ifdef OS2
38ab35f8 2544 os2_setsyserrno(SvIV(sv));
e37778c2 2545# else
d0063567 2546 /* will anyone ever use this? */
38ab35f8 2547 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2548# endif
2549# endif
22fae026 2550#endif
d0063567
DK
2551 }
2552 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
ef8d46e8 2553 SvREFCNT_dec(PL_encoding);
d0063567
DK
2554 if (SvOK(sv) || SvGMAGICAL(sv)) {
2555 PL_encoding = newSVsv(sv);
2556 }
2557 else {
a0714e2c 2558 PL_encoding = NULL;
d0063567
DK
2559 }
2560 }
2561 break;
79072805 2562 case '\006': /* ^F */
38ab35f8 2563 PL_maxsysfd = SvIV(sv);
79072805 2564 break;
a0d0e21e 2565 case '\010': /* ^H */
38ab35f8 2566 PL_hints = SvIV(sv);
a0d0e21e 2567 break;
9d116dd7 2568 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2569 Safefree(PL_inplace);
bd61b366 2570 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2571 break;
d9bad346
FC
2572 case '\016': /* ^N */
2573 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2574 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2575 goto croakparen;
28f23441 2576 case '\017': /* ^O */
ac27b0f5 2577 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2578 Safefree(PL_osname);
bd61b366 2579 PL_osname = NULL;
3511154c
DM
2580 if (SvOK(sv)) {
2581 TAINT_PROPER("assigning to $^O");
2e0de35c 2582 PL_osname = savesvpv(sv);
3511154c 2583 }
ac27b0f5
NIS
2584 }
2585 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2586 STRLEN len;
2587 const char *const start = SvPV(sv, len);
b54fc2b6 2588 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2589 SV *tmp;
8b850bd5
NC
2590
2591
2592 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2593 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2594
2595 /* Opening for input is more common than opening for output, so
2596 ensure that hints for input are sooner on linked list. */
59cd0e26 2597 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2598 SvUTF8(sv))
2599 : newSVpvs_flags("", SvUTF8(sv));
2600 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2601 mg_set(tmp);
8b850bd5 2602
f747ebd6
Z
2603 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2604 SvUTF8(sv));
2605 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2606 mg_set(tmp);
ac27b0f5 2607 }
28f23441 2608 break;
79072805 2609 case '\020': /* ^P */
2fdbfb4d
AB
2610 PL_perldb = SvIV(sv);
2611 if (PL_perldb && !PL_DBsingle)
2612 init_debugger();
9b9e0be4 2613 break;
79072805 2614 case '\024': /* ^T */
88e89b8a 2615#ifdef BIG_TIME
6b88bc9c 2616 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2617#else
38ab35f8 2618 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2619#endif
79072805 2620 break;
e07ea26a
NC
2621 case '\025': /* ^UTF8CACHE */
2622 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2623 PL_utf8cache = (signed char) sv_2iv(sv);
2624 }
2625 break;
fde18df1 2626 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2627 if (*(mg->mg_ptr+1) == '\0') {
2628 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2629 i = SvIV(sv);
ac27b0f5 2630 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2631 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2632 }
599cee73 2633 }
0a378802 2634 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2635 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2636 if (!SvPOK(sv)) {
2637 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2638 break;
2639 }
f4fc7782 2640 {
b5477537 2641 STRLEN len, i;
d3a7d8c7 2642 int accumulate = 0 ;
f4fc7782 2643 int any_fatals = 0 ;
b83604b4 2644 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2645 for (i = 0 ; i < len ; ++i) {
2646 accumulate |= ptr[i] ;
2647 any_fatals |= (ptr[i] & 0xAA) ;
2648 }
4243c432
NC
2649 if (!accumulate) {
2650 if (!specialWARN(PL_compiling.cop_warnings))
2651 PerlMemShared_free(PL_compiling.cop_warnings);
2652 PL_compiling.cop_warnings = pWARN_NONE;
2653 }
72dc9ed5 2654 /* Yuck. I can't see how to abstract this: */
2f3f0b56
KW
2655 else if (isWARN_on(
2656 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2657 WARN_ALL)
2658 && !any_fatals)
2659 {
4243c432
NC
2660 if (!specialWARN(PL_compiling.cop_warnings))
2661 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH
2662 PL_compiling.cop_warnings = pWARN_ALL;
2663 PL_dowarn |= G_WARN_ONCE ;
727405f8 2664 }
d3a7d8c7 2665 else {
72dc9ed5
NC
2666 STRLEN len;
2667 const char *const p = SvPV_const(sv, len);
2668
2669 PL_compiling.cop_warnings
8ee4cf24 2670 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2671 p, len);
2672
d3a7d8c7
GS
2673 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2674 PL_dowarn |= G_WARN_ONCE ;
2675 }
f4fc7782 2676
d3a7d8c7 2677 }
4438c4b7 2678 }
971a9dd3 2679 }
79072805
LW
2680 break;
2681 case '.':
3280af22
NIS
2682 if (PL_localizing) {
2683 if (PL_localizing == 1)
7766f137 2684 SAVESPTR(PL_last_in_gv);
748a9306 2685 }
3280af22 2686 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2687 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2688 break;
2689 case '^':
acbe1b9d
FC
2690 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2691 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2692 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2693 break;
2694 case '~':
acbe1b9d
FC
2695 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2696 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2697 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2698 break;
2699 case '=':
acbe1b9d 2700 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2701 break;
2702 case '-':
acbe1b9d
FC
2703 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2704 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2705 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2706 break;
2707 case '%':
acbe1b9d 2708 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2709 break;
2710 case '|':
4b65379b 2711 {
099be4f1 2712 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2713 if(!io)
2714 break;
38ab35f8 2715 if ((SvIV(sv)) == 0)
4b65379b
CS
2716 IoFLAGS(io) &= ~IOf_FLUSH;
2717 else {
2718 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2719 PerlIO *ofp = IoOFP(io);
2720 if (ofp)
2721 (void)PerlIO_flush(ofp);
2722 IoFLAGS(io) |= IOf_FLUSH;
2723 }
2724 }
79072805
LW
2725 }
2726 break;
79072805 2727 case '/':
3280af22 2728 SvREFCNT_dec(PL_rs);
8bfdd7d9 2729 PL_rs = newSVsv(sv);
79072805
LW
2730 break;
2731 case '\\':
ef8d46e8 2732 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2733 if (SvOK(sv)) {
7889fe52 2734 PL_ors_sv = newSVsv(sv);
009c130f 2735 }
e3c19b7b 2736 else {
a0714e2c 2737 PL_ors_sv = NULL;
e3c19b7b 2738 }
79072805 2739 break;
7d69d4a6
FC
2740 case '[':
2741 if (SvIV(sv) != 0)
2742 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2743 break;
79072805 2744 case '?':
ff0cee69 2745#ifdef COMPLEX_STATUS
6b88bc9c 2746 if (PL_localizing == 2) {
41cb7b2b 2747 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2748 PL_statusvalue = LvTARGOFF(sv);
2749 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2750 }
2751 else
2752#endif
2753#ifdef VMSISH_STATUS
2754 if (VMSISH_STATUS)
fb38d079 2755 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2756 else
2757#endif
38ab35f8 2758 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2759 break;
2760 case '!':
93189314
JH
2761 {
2762#ifdef VMS
2763# define PERL_VMS_BANG vaxc$errno
2764#else
2765# define PERL_VMS_BANG 0
2766#endif
27329181 2767#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
2768 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2769 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2770#else
91487cfc 2771 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2772 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2773#endif
93189314 2774 }
79072805
LW
2775 break;
2776 case '<':
985213f2 2777 {
04783dc7 2778 int rc = 0;
dfff4baf 2779 const Uid_t new_uid = SvUID(sv);
985213f2 2780 PL_delaymagic_uid = new_uid;
3280af22
NIS
2781 if (PL_delaymagic) {
2782 PL_delaymagic |= DM_RUID;
79072805
LW
2783 break; /* don't do magic till later */
2784 }
2785#ifdef HAS_SETRUID
04783dc7 2786 rc = setruid(new_uid);
79072805
LW
2787#else
2788#ifdef HAS_SETREUID
04783dc7 2789 rc = setreuid(new_uid, (Uid_t)-1);
748a9306 2790#else
85e6fe83 2791#ifdef HAS_SETRESUID
04783dc7 2792 rc = setresuid(new_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2793#else
985213f2 2794 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2795#ifdef PERL_DARWIN
2796 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2797 if (new_uid != 0 && PerlProc_getuid() == 0)
04783dc7 2798 rc = PerlProc_setuid(0);
75870ed3 2799#endif
04783dc7 2800 rc = PerlProc_setuid(new_uid);
75870ed3 2801 } else {
cea2e8a9 2802 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2803 }
79072805
LW
2804#endif
2805#endif
85e6fe83 2806#endif
04783dc7
DM
2807 /* XXX $< currently silently ignores failures */
2808 PERL_UNUSED_VAR(rc);
79072805 2809 break;
985213f2 2810 }
79072805 2811 case '>':
985213f2 2812 {
04783dc7 2813 int rc = 0;
dfff4baf 2814 const Uid_t new_euid = SvUID(sv);
985213f2 2815 PL_delaymagic_euid = new_euid;
3280af22
NIS
2816 if (PL_delaymagic) {
2817 PL_delaymagic |= DM_EUID;
79072805
LW
2818 break; /* don't do magic till later */
2819 }
2820#ifdef HAS_SETEUID
04783dc7 2821 rc = seteuid(new_euid);
79072805
LW
2822#else
2823#ifdef HAS_SETREUID
04783dc7 2824 rc = setreuid((Uid_t)-1, new_euid);
85e6fe83
LW
2825#else
2826#ifdef HAS_SETRESUID
04783dc7 2827 rc = setresuid((Uid_t)-1, new_euid, (Uid_t)-1);
79072805 2828#else
985213f2 2829 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
04783dc7 2830 rc = PerlProc_setuid(new_euid);
a0d0e21e 2831 else {
cea2e8a9 2832 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2833 }
79072805
LW
2834#endif
2835#endif
85e6fe83 2836#endif
04783dc7
DM
2837 /* XXX $> currently silently ignores failures */
2838 PERL_UNUSED_VAR(rc);
79072805 2839 break;
985213f2 2840 }
79072805 2841 case '(':
985213f2 2842 {
04783dc7 2843 int rc = 0;
dfff4baf 2844 const Gid_t new_gid = SvGID(sv);
985213f2 2845 PL_delaymagic_gid = new_gid;
3280af22
NIS
2846 if (PL_delaymagic) {
2847 PL_delaymagic |= DM_RGID;
79072805
LW
2848 break; /* don't do magic till later */
2849 }
2850#ifdef HAS_SETRGID
04783dc7 2851 rc = setrgid(new_gid);
79072805
LW
2852#else
2853#ifdef HAS_SETREGID
04783dc7 2854 rc = setregid(new_gid, (Gid_t)-1);
85e6fe83
LW
2855#else
2856#ifdef HAS_SETRESGID
04783dc7 2857 rc = setresgid(new_gid, (Gid_t)-1, (Gid_t) -1);
79072805 2858#else
985213f2 2859 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
04783dc7 2860 rc = PerlProc_setgid(new_gid);
748a9306 2861 else {
cea2e8a9 2862 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2863 }
79072805
LW
2864#endif
2865#endif
85e6fe83 2866#endif
04783dc7
DM
2867 /* XXX $( currently silently ignores failures */
2868 PERL_UNUSED_VAR(rc);
79072805 2869 break;
985213f2 2870 }
79072805 2871 case ')':
985213f2 2872 {
04783dc7 2873 int rc = 0;
dfff4baf 2874 Gid_t new_egid;
5cd24f17
PP
2875#ifdef HAS_SETGROUPS
2876 {
b83604b4 2877 const char *p = SvPV_const(sv, len);
757f63d8 2878 Groups_t *gary = NULL;
fb4089e0 2879#ifdef _SC_NGROUPS_MAX
2880 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2881
2882 if (maxgrp < 0)
2883 maxgrp = NGROUPS;
2884#else
2885 int maxgrp = NGROUPS;
2886#endif
757f63d8
SP
2887
2888 while (isSPACE(*p))
2889 ++p;
dfff4baf 2890 new_egid = (Gid_t)Atol(p);
fb4089e0 2891 for (i = 0; i < maxgrp; ++i) {
757f63d8
SP
2892 while (*p && !isSPACE(*p))
2893 ++p;
2894 while (isSPACE(*p))
2895 ++p;
2896 if (!*p)
2897 break;
2898 if(!gary)
2899 Newx(gary, i + 1, Groups_t);
2900 else
2901 Renew(gary, i + 1, Groups_t);
dfff4baf 2902 gary[i] = (Groups_t)Atol(p);
757f63d8
SP
2903 }
2904 if (i)
04783dc7 2905 rc = setgroups(i, gary);
f5a63d97 2906 Safefree(gary);
5cd24f17
PP
2907 }
2908#else /* HAS_SETGROUPS */
dfff4baf 2909 new_egid = SvGID(sv);
5cd24f17 2910#endif /* HAS_SETGROUPS */
985213f2 2911 PL_delaymagic_egid = new_egid;
3280af22
NIS
2912 if (PL_delaymagic) {
2913 PL_delaymagic |= DM_EGID;
79072805
LW
2914 break; /* don't do magic till later */
2915 }
2916#ifdef HAS_SETEGID
04783dc7 2917 rc = setegid(new_egid);
79072805
LW
2918#else
2919#ifdef HAS_SETREGID
04783dc7 2920 rc = setregid((Gid_t)-1, new_egid);
85e6fe83
LW
2921#else
2922#ifdef HAS_SETRESGID
04783dc7 2923 rc = setresgid((Gid_t)-1, new_egid, (Gid_t)-1);
79072805 2924#else
985213f2 2925 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
04783dc7 2926 rc = PerlProc_setgid(new_egid);
748a9306 2927 else {
cea2e8a9 2928 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2929 }
79072805
LW
2930#endif
2931#endif
85e6fe83 2932#endif
04783dc7
DM
2933 /* XXX $) currently silently ignores failures */
2934 PERL_UNUSED_VAR(rc);
79072805 2935 break;
985213f2 2936 }
79072805 2937 case ':':
2d8e6c8d 2938 PL_chopset = SvPV_force(sv,len);
79072805 2939 break;
9cdac2a2
FC
2940 case '$': /* $$ */
2941 /* Store the pid in mg->mg_obj so we can tell when a fork has
2942 occurred. mg->mg_obj points to *$ by default, so clear it. */
2943 if (isGV(mg->mg_obj)) {
2944 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
2945 SvREFCNT_dec(mg->mg_obj);
2946 mg->mg_flags |= MGf_REFCOUNTED;
2947 mg->mg_obj = newSViv((IV)PerlProc_getpid());
2948 }
2949 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
2950 break;
79072805 2951 case '0':
e2975953 2952 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS
2953#ifdef HAS_SETPROCTITLE
2954 /* The BSDs don't show the argv[] in ps(1) output, they
2955 * show a string from the process struct and provide
2956 * the setproctitle() routine to manipulate that. */
a2722ac9 2957 if (PL_origalen != 1) {
b83604b4 2958 s = SvPV_const(sv, len);
98b76f99 2959# if __FreeBSD_version > 410001
9aad2c0e 2960 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS
2961 * but not the "(perl) suffix from the ps(1)
2962 * output, because that's what ps(1) shows if the
2963 * argv[] is modified. */
6f2ad931 2964 setproctitle("-%s", s);
9aad2c0e 2965# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS
2966 /* This doesn't really work if you assume that
2967 * $0 = 'foobar'; will wipe out 'perl' from the $0
2968 * because in ps(1) output the result will be like
2969 * sprintf("perl: %s (perl)", s)
2970 * I guess this is a security feature:
2971 * one (a user process) cannot get rid of the original name.
2972 * --jhi */
2973 setproctitle("%s", s);
2974# endif
2975 }
9d3968b2 2976#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 2977 if (PL_origalen != 1) {
17aa7f3d 2978 union pstun un;
b83604b4 2979 s = SvPV_const(sv, len);
6867be6d 2980 un.pst_command = (char *)s;
17aa7f3d
JH
2981 pstat(PSTAT_SETCMD, un, len, 0, 0);
2982 }
9d3968b2 2983#else
2d2af554
GA
2984 if (PL_origalen > 1) {
2985 /* PL_origalen is set in perl_parse(). */
2986 s = SvPV_force(sv,len);
2987 if (len >= (STRLEN)PL_origalen-1) {
2988 /* Longer than original, will be truncated. We assume that
2989 * PL_origalen bytes are available. */
2990 Copy(s, PL_origargv[0], PL_origalen-1, char);
2991 }
2992 else {
2993 /* Shorter than original, will be padded. */
235ac35d 2994#ifdef PERL_DARWIN
60777a0d
JH
2995 /* Special case for Mac OS X: see [perl #38868] */
2996 const int pad = 0;
235ac35d 2997#else
8a89a4f1
MB
2998 /* Is the space counterintuitive? Yes.
2999 * (You were expecting \0?)
3000 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3001 * --jhi */
60777a0d 3002 const int pad = ' ';
235ac35d 3003#endif
60777a0d
JH
3004 Copy(s, PL_origargv[0], len, char);
3005 PL_origargv[0][len] = 0;
3006 memset(PL_origargv[0] + len + 1,
3007 pad, PL_origalen - len - 1);
2d2af554
GA
3008 }
3009 PL_origargv[0][PL_origalen-1] = 0;
3010 for (i = 1; i < PL_origargc; i++)
3011 PL_origargv[i] = 0;
7636ea95
AB
3012#ifdef HAS_PRCTL_SET_NAME
3013 /* Set the legacy process name in addition to the POSIX name on Linux */
3014 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3015 /* diag_listed_as: SKIPME */
3016 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3017 }
3018#endif
79072805 3019 }
9d3968b2 3020#endif
e2975953 3021 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3022 break;
3023 }
3024 return 0;
3025}
3026
3027I32
84c7b88c
BF
3028Perl_whichsig_sv(pTHX_ SV *sigsv)
3029{
3030 const char *sigpv;
3031 STRLEN siglen;
3032 PERL_ARGS_ASSERT_WHICHSIG_SV;
3033 PERL_UNUSED_CONTEXT;
3034 sigpv = SvPV_const(sigsv, siglen);
3035 return whichsig_pvn(sigpv, siglen);
3036}
3037
3038I32
3039Perl_whichsig_pv(pTHX_ const char *sig)
3040{
3041 PERL_ARGS_ASSERT_WHICHSIG_PV;
3042 PERL_UNUSED_CONTEXT;
3043 return whichsig_pvn(sig, strlen(sig));
3044}
3045
3046I32
3047Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3048{
eb578fdb 3049 char* const* sigv;
7918f24d 3050
84c7b88c 3051 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3052 PERL_UNUSED_CONTEXT;
79072805 3053
aadb217d 3054 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3055 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3056 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3057#ifdef SIGCLD
84c7b88c 3058 if (memEQs(sig, len, "CHLD"))
79072805
LW
3059 return SIGCLD;
3060#endif
3061#ifdef SIGCHLD
84c7b88c 3062 if (memEQs(sig, len, "CLD"))
79072805
LW
3063 return SIGCHLD;
3064#endif
7f1236c0 3065 return -1;
79072805
LW
3066}
3067
ecfc5424 3068Signal_t
1e82f5a6 3069#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3070Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3071#else
3072Perl_sighandler(int sig)
3073#endif
79072805 3074{
1018e26f
NIS
3075#ifdef PERL_GET_SIG_CONTEXT
3076 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3077#else
cea2e8a9 3078 dTHX;
71d280e3 3079#endif
79072805 3080 dSP;
a0714e2c
SS
3081 GV *gv = NULL;
3082 SV *sv = NULL;
8772537c 3083 SV * const tSv = PL_Sv;
601f1833 3084 CV *cv = NULL;
533c011a 3085 OP *myop = PL_op;
84902520 3086 U32 flags = 0;
8772537c 3087 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3088 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3089 SV *errsv_save = NULL;
71d280e3 3090
84902520 3091
727405f8 3092 if (!PL_psig_ptr[sig]) {
99ef548b 3093 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3094 PL_sig_name[sig]);
3095 exit(sig);
3096 }
ff0cee69 3097
a0d63a7b
DM
3098 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3099 /* Max number of items pushed there is 3*n or 4. We cannot fix
3100 infinity, so we fix 4 (in fact 5): */
3101 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3102 flags |= 1;
3103 PL_savestack_ix += 5; /* Protect save in progress. */
3104 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3105 }
84902520 3106 }
84902520 3107 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3108 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3109 || SvTYPE(cv) != SVt_PVCV) {
3110 HV *st;
f2c0649b 3111 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3112 }
84902520 3113
a0d0e21e 3114 if (!cv || !CvROOT(cv)) {
a2a5de95
NC
3115 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3116 PL_sig_name[sig], (gv ? GvENAME(gv)
3117 : ((cv && CvGV(cv))
3118 ? GvENAME(CvGV(cv))
3119 : "__ANON__")));
00d579c5 3120 goto cleanup;
79072805
LW
3121 }
3122
0c4d3b5e
DM
3123 sv = PL_psig_name[sig]
3124 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3125 : newSVpv(PL_sig_name[sig],0);
72048cfe 3126 flags |= 8;
0c4d3b5e
DM
3127 SAVEFREESV(sv);
3128
a0d63a7b
DM
3129 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3130 /* make sure our assumption about the size of the SAVEs are correct:
3131 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3132 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3133 }
e336de0d 3134
e788e7d3 3135 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3136 PUSHMARK(SP);
79072805 3137 PUSHs(sv);
8aad04aa
JH
3138#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3139 {
3140 struct sigaction oact;
3141
3142 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3143 if (sip) {
3144 HV *sih = newHV();
ad64d0ec 3145 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3146 /* The siginfo fields signo, code, errno, pid, uid,
3147 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3148 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3149 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3150#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
3151 hv_stores(sih, "errno", newSViv(sip->si_errno));
3152 hv_stores(sih, "status", newSViv(sip->si_status));
3153 hv_stores(sih, "uid", newSViv(sip->si_uid));
3154 hv_stores(sih, "pid", newSViv(sip->si_pid));
3155 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3156 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3157#endif
8aad04aa 3158 EXTEND(SP, 2);
ad64d0ec 3159 PUSHs(rv);
22f1178f 3160 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3161 }
b4552a27 3162
8aad04aa
JH
3163 }
3164 }
3165#endif
79072805 3166 PUTBACK;
a0d0e21e 3167
100c03aa
JL
3168 errsv_save = newSVsv(ERRSV);
3169
ad64d0ec 3170 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3171
d3acc0f7 3172 POPSTACK;
eed484f9
DD
3173 {
3174 SV * const errsv = ERRSV;
3175 if (SvTRUE_NN(errsv)) {
3176 SvREFCNT_dec(errsv_save);
c22d665b 3177#ifndef PERL_MICRO
1b266415
NIS
3178 /* Handler "died", for example to get out of a restart-able read().
3179 * Before we re-do that on its behalf re-enable the signal which was
3180 * blocked by the system when we entered.
3181 */
c22d665b 3182#ifdef HAS_SIGPROCMASK
d488af49 3183#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3184 if (sip || uap)
c22d665b 3185#endif
eed484f9
DD
3186 {
3187 sigset_t set;
3188 sigemptyset(&set);
3189 sigaddset(&set,sig);
3190 sigprocmask(SIG_UNBLOCK, &set, NULL);
3191 }
c22d665b 3192#else
eed484f9
DD
3193 /* Not clear if this will work */
3194 (void)rsignal(sig, SIG_IGN);
3195 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3196#endif
3197#endif /* !PERL_MICRO */
eed484f9
DD
3198 die_sv(errsv);
3199 }
3200 else {
3201 sv_setsv(errsv, errsv_save);
3202 SvREFCNT_dec(errsv_save);
3203 }
100c03aa
JL
3204 }
3205
00d579c5 3206cleanup:
0c4d3b5e
DM
3207 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3208 PL_savestack_ix = old_ss_ix;
72048cfe 3209 if (flags & 8)
2357bae7 3210 SvREFCNT_dec_NN(sv);
533c011a 3211 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3212
3280af22
NIS
3213 PL_Sv = tSv; /* Restore global temporaries. */
3214 PL_Xpv = tXpv;
53bb94e2 3215 return;
79072805 3216}
4e35701f
NIS
3217
3218
51371543 3219static void
8772537c 3220S_restore_magic(pTHX_ const void *p)
51371543 3221{
97aff369 3222 dVAR;
8772537c
AL
3223 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3224 SV* const sv = mgs->mgs_sv;
150b625d 3225 bool bumped;
51371543
GS
3226
3227 if (!sv)
3228 return;
3229
4bac9ae4
CS
3230 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3231 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
f8c7b90f 3232#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC
3233 /* While magic was saved (and off) sv_setsv may well have seen
3234 this SV as a prime candidate for COW. */
3235 if (SvIsCOW(sv))
e424a81e 3236 sv_force_normal_flags(sv, 0);
f9701176 3237#endif
f9c6fee5
CS
3238 if (mgs->mgs_readonly)
3239 SvREADONLY_on(sv);
3240 if (mgs->mgs_magical)
3241 SvFLAGS(sv) |= mgs->mgs_magical;
51371543
GS
3242 else
3243 mg_magical(sv);
51371543
GS
3244 }
3245
150b625d 3246 bumped = mgs->mgs_bumped;
51371543
GS
3247 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3248
3249 /* If we're still on top of the stack, pop us off. (That condition
3250 * will be satisfied if restore_magic was called explicitly, but *not*
3251 * if it's being called via leave_scope.)
3252 * The reason for doing this is that otherwise, things like sv_2cv()
3253 * may leave alloc gunk on the savestack, and some code
3254 * (e.g. sighandler) doesn't expect that...
3255 */
3256 if (PL_savestack_ix == mgs->mgs_ss_ix)
3257 {
1be36ce0
NC
3258 UV popval = SSPOPUV;
3259 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3260 PL_savestack_ix -= 2;
1be36ce0
NC
3261 popval = SSPOPUV;
3262 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3263 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3264 }
150b625d
DM
3265 if (bumped) {
3266 if (SvREFCNT(sv) == 1) {
3267 /* We hold the last reference to this SV, which implies that the
3268 SV was deleted as a side effect of the routines we called.
3269 So artificially keep it alive a bit longer.
3270 We avoid turning on the TEMP flag, which can cause the SV's
3271 buffer to get stolen (and maybe other stuff). */
150b625d 3272 sv_2mortal(sv);
4bac9ae4 3273 SvTEMP_off(sv);
8985fe98 3274 }
150b625d 3275 else
2357bae7 3276 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3277 }
51371543
GS
3278}
3279
0c4d3b5e
DM
3280/* clean up the mess created by Perl_sighandler().
3281 * Note that this is only called during an exit in a signal handler;
3282 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3283 * skipped over. */
0c4d3b5e 3284
51371543 3285static void
8772537c 3286S_unwind_handler_stack(pTHX_ const void *p)
51371543 3287{
27da23d5 3288 dVAR;
0c4d3b5e 3289 PERL_UNUSED_ARG(p);
7918f24d 3290
0c4d3b5e 3291 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3292}
1018e26f 3293
66610fdd 3294/*
b3ca2e83
NC
3295=for apidoc magic_sethint
3296
3297Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC
3298C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3299anything that would need a deep copy. Maybe we should warn if we find a
3300reference.
b3ca2e83
NC
3301
3302=cut
3303*/
3304int
3305Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3306{
3307 dVAR;
ad64d0ec 3308 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3309 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3310
7918f24d
NC
3311 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3312
e6e3e454
NC
3313 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3314 an alternative leaf in there, with PL_compiling.cop_hints being used if
3315 it's NULL. If needed for threads, the alternative could lock a mutex,
3316 or take other more complex action. */
3317
5b9c0671
NC
3318 /* Something changed in %^H, so it will need to be restored on scope exit.
3319 Doing this here saves a lot of doing it manually in perl code (and
3320 forgetting to do it, and consequent subtle errors. */
3321 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z
3322 CopHINTHASH_set(&PL_compiling,
3323 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC
3324 return 0;
3325}
3326
3327/*
f175cff5 3328=for apidoc magic_clearhint
b3ca2e83 3329
c28fe1ec
NC
3330Triggered by a delete from %^H, records the key to
3331C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC
3332
3333=cut
3334*/
3335int
3336Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3337{
3338 dVAR;
7918f24d
NC
3339
3340 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL
3341 PERL_UNUSED_ARG(sv);
3342
5b9c0671 3343 PL_hints |= HINT_LOCALIZE_HH;
20439bc7 3344 CopHINTHASH_set(&PL_compiling,
e3352591
FC
3345 mg->mg_len == HEf_SVKEY
3346 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3347 MUTABLE_SV(mg->mg_ptr), 0, 0)
3348 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3349 mg->mg_ptr, mg->mg_len, 0, 0));
b3ca2e83
NC
3350 return 0;
3351}
3352
3353/*
f747ebd6
Z
3354=for apidoc magic_clearhints
3355
3356Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3357
3358=cut
3359*/
3360int
3361Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3362{
3363 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3364 PERL_UNUSED_ARG(sv);
3365 PERL_UNUSED_ARG(mg);
20439bc7
Z
3366 cophh_free(CopHINTHASH_get(&PL_compiling));
3367 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
f747ebd6
Z
3368 return 0;
3369}
3370
09fb282d
FC
3371int
3372Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3373 const char *name, I32 namlen)
3374{
3375 MAGIC *nmg;
3376
3377 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
4f8dbb2d 3378 PERL_UNUSED_ARG(sv);
09fb282d
FC
3379 PERL_UNUSED_ARG(name);
3380 PERL_UNUSED_ARG(namlen);
3381
3382 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3383 nmg = mg_find(nsv, mg->mg_type);
3384 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3385 nmg->mg_ptr = mg->mg_ptr;
3386 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3387 nmg->mg_flags |= MGf_REFCOUNTED;
3388 return 1;
3389}
3390
f747ebd6 3391/*
66610fdd
RGS
3392 * Local variables:
3393 * c-indentation-style: bsd
3394 * c-basic-offset: 4
14d04a33 3395 * indent-tabs-mode: nil
66610fdd
RGS
3396 * End:
3397 *
14d04a33 3398 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3399 */