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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 */
823a54a3 791 if (nextchar == '\0') {
e37778c2 792#if defined(VMS)
0a378802 793 {
0a378802
JH
794 char msg[255];
795 $DESCRIPTOR(msgdsc,msg);
796 sv_setnv(sv,(NV) vaxc$errno);
797 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
798 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
799 else
76f68e9b 800 sv_setpvs(sv,"");
0a378802 801 }
4b645107 802#elif defined(OS2)
0a378802
JH
803 if (!(_emx_env & 0x200)) { /* Under DOS */
804 sv_setnv(sv, (NV)errno);
805 sv_setpv(sv, errno ? Strerror(errno) : "");
806 } else {
807 if (errno != errno_isOS2) {
823a54a3 808 const int tmp = _syserrno();
0a378802
JH
809 if (tmp) /* 2nd call to _syserrno() makes it 0 */
810 Perl_rc = tmp;
811 }
812 sv_setnv(sv, (NV)Perl_rc);
813 sv_setpv(sv, os2error(Perl_rc));
814 }
4b645107 815#elif defined(WIN32)
0a378802 816 {
d4c19fe8 817 const DWORD dwErr = GetLastError();
0a378802 818 sv_setnv(sv, (NV)dwErr);
823a54a3 819 if (dwErr) {
0a378802
JH
820 PerlProc_GetOSError(sv, dwErr);
821 }
822 else
76f68e9b 823 sv_setpvs(sv, "");
0a378802
JH
824 SetLastError(dwErr);
825 }
22fae026 826#else
f6c8f21d 827 {
4ee39169 828 dSAVE_ERRNO;
f6c8f21d 829 sv_setnv(sv, (NV)errno);
666ea192 830 sv_setpv(sv, errno ? Strerror(errno) : "");
4ee39169 831 RESTORE_ERRNO;
f6c8f21d 832 }
28f23441 833#endif
ad3296c6 834 SvRTRIM(sv);
0a378802
JH
835 SvNOK_on(sv); /* what a wonderful hack! */
836 }
823a54a3 837 else if (strEQ(remaining, "NCODING"))
0a378802
JH
838 sv_setsv(sv, PL_encoding);
839 break;
79072805 840 case '\006': /* ^F */
3280af22 841 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 842 break;
9ebf26ad
FR
843 case '\007': /* ^GLOBAL_PHASE */
844 if (strEQ(remaining, "LOBAL_PHASE")) {
845 sv_setpvn(sv, PL_phase_names[PL_phase],
846 strlen(PL_phase_names[PL_phase]));
847 }
848 break;
a0d0e21e 849 case '\010': /* ^H */
3280af22 850 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 851 break;
9d116dd7 852 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 853 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 854 break;
8561ea1d
FC
855 case '\014': /* ^LAST_FH */
856 if (strEQ(remaining, "AST_FH")) {
857 if (PL_last_in_gv) {
858 assert(isGV_with_GP(PL_last_in_gv));
859 SV_CHECK_THINKFIRST_COW_DROP(sv);
860 prepare_SV_for_RV(sv);
861 SvOK_off(sv);
862 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
863 SvROK_on(sv);
864 sv_rvweaken(sv);
865 }
866 else sv_setsv_nomg(sv, NULL);
867 }
868 break;
ac27b0f5 869 case '\017': /* ^O & ^OPEN */
823a54a3 870 if (nextchar == '\0') {
ac27b0f5 871 sv_setpv(sv, PL_osname);
3511154c
DM
872 SvTAINTED_off(sv);
873 }
823a54a3 874 else if (strEQ(remaining, "PEN")) {
8b850bd5 875 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 876 }
28f23441 877 break;
9ebf26ad 878 case '\020':
a6d0b1b5 879 sv_setiv(sv, (IV)PL_perldb);
79072805 880 break;
fb73857a 881 case '\023': /* ^S */
a6d0b1b5 882 {
bc177e6b 883 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 884 SvOK_off(sv);
3280af22 885 else if (PL_in_eval)
6dc8a9e4 886 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
887 else
888 sv_setiv(sv, 0);
d58bf5aa 889 }
fb73857a 890 break;
79072805 891 case '\024': /* ^T */
823a54a3 892 if (nextchar == '\0') {
88e89b8a 893#ifdef BIG_TIME
7c36658b 894 sv_setnv(sv, PL_basetime);
88e89b8a 895#else
7c36658b 896 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 897#endif
7c36658b 898 }
823a54a3 899 else if (strEQ(remaining, "AINT"))
284167a5
SM
900 sv_setiv(sv, TAINTING_get
901 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 902 : 0);
7c36658b 903 break;
e07ea26a 904 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 905 if (strEQ(remaining, "NICODE"))
a05d7ebb 906 sv_setuv(sv, (UV) PL_unicode);
823a54a3 907 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 908 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
909 else if (strEQ(remaining, "TF8CACHE"))
910 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
911 break;
912 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 913 if (nextchar == '\0')
4438c4b7 914 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 915 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 916 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 917 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
918 }
919 else if (PL_compiling.cop_warnings == pWARN_STD) {
7e4f0450
FC
920 sv_setsv(sv, &PL_sv_undef);
921 break;
013b78e8 922 }
d3a7d8c7 923 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
924 /* Get the bit mask for $warnings::Bits{all}, because
925 * it could have been extended by warnings::register */
4bac9ae4
CS
926 HV * const bits = get_hv("warnings::Bits", 0);
927 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
928 if (bits_all)
929 sv_copypv(sv, *bits_all);
930 else
931 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 932 }
4438c4b7 933 else {
72dc9ed5
NC
934 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
935 *PL_compiling.cop_warnings);
ac27b0f5 936 }
4438c4b7 937 }
79072805 938 break;
79072805 939 case '+':
aaa362c4 940 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
941 paren = RX_LASTPAREN(rx);
942 if (paren)
943 goto do_numbuf_fetch;
79072805 944 }
3280af22 945 sv_setsv(sv,&PL_sv_undef);
79072805 946 break;
a01268b5
JH
947 case '\016': /* ^N */
948 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
949 paren = RX_LASTCLOSEPAREN(rx);
950 if (paren)
951 goto do_numbuf_fetch;
a01268b5
JH
952 }
953 sv_setsv(sv,&PL_sv_undef);
954 break;
79072805 955 case '.':
3280af22 956 if (GvIO(PL_last_in_gv)) {
357c8808 957 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 958 }
79072805
LW
959 break;
960 case '?':
809a5acc 961 {
809a5acc 962 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 963#ifdef COMPLEX_STATUS
41cb7b2b 964 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
965 LvTARGOFF(sv) = PL_statusvalue;
966 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 967#endif
809a5acc 968 }
79072805
LW
969 break;
970 case '^':
acbe1b9d 971 if (GvIOp(PL_defoutgv))
099be4f1 972 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
973 if (s)
974 sv_setpv(sv,s);
975 else {
3280af22 976 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 977 sv_catpvs(sv,"_TOP");
79072805
LW
978 }
979 break;
980 case '~':
acbe1b9d 981 if (GvIOp(PL_defoutgv))
0daa599b 982 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 983 if (!s)
3280af22 984 s = GvENAME(PL_defoutgv);
79072805
LW
985 sv_setpv(sv,s);
986 break;
79072805 987 case '=':
099be4f1 988 if (GvIO(PL_defoutgv))
0daa599b 989 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
990 break;
991 case '-':
099be4f1 992 if (GvIO(PL_defoutgv))
0daa599b 993 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
994 break;
995 case '%':
099be4f1 996 if (GvIO(PL_defoutgv))
0daa599b 997 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 998 break;
79072805
LW
999 case ':':
1000 break;
1001 case '/':
1002 break;
1003 case '[':
e1dccc0d 1004 sv_setiv(sv, 0);
79072805
LW
1005 break;
1006 case '|':
099be4f1 1007 if (GvIO(PL_defoutgv))
0daa599b 1008 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1009 break;
79072805 1010 case '\\':
b2ce0fda 1011 if (PL_ors_sv)
f28098ff 1012 sv_copypv(sv, PL_ors_sv);
4bac9ae4
CS
1013 else
1014 sv_setsv(sv, &PL_sv_undef);
79072805 1015 break;
0e219455 1016 case '$': /* $$ */
9cdac2a2
FC
1017 {
1018 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1019 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1020 /* never set manually, or at least not since last fork */
1021 sv_setiv(sv, pid);
19db9fb7
Z
1022 /* never unsafe, even if reading in a tainted expression */
1023 SvTAINTED_off(sv);
1024 }
9cdac2a2
FC
1025 /* else a value has been assigned manually, so do nothing */
1026 }
0e219455
MM
1027 break;
1028
79072805 1029 case '!':
666d8aa2
CB
1030 {
1031 dSAVE_ERRNO;
a5f75d66 1032#ifdef VMS
65202027 1033 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
a5f75d66 1034#else
65202027 1035 sv_setnv(sv, (NV)errno);
666d8aa2 1036#endif
88e89b8a 1037#ifdef OS2
ed344e4f
IZ
1038 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1039 sv_setpv(sv, os2error(Perl_rc));
88e89b8a 1040 else
a5f75d66 1041#endif
1500bd91
KW
1042 if (! errno) {
1043 sv_setpvs(sv, "");
1044 }
1045 else {
1046
1047 /* Strerror can return NULL on some platforms, which will result in
1048 * 'sv' not being considered SvOK. The SvNOK_on() below will cause
1049 * just the number part to be valid */
1050 sv_setpv(sv, Strerror(errno));
1051
1052 /* In some locales the error string may come back as UTF-8, in
1053 * which case we should turn on that flag. This didn't use to
1054 * happen, and to avoid any possible backward compatibility issues,
1055 * we don't turn on the flag unless we have to. So the flag stays
1056 * off for an entirely ASCII string. We assume that if the string
1057 * looks like UTF-8, it really is UTF-8: "text in any other
1058 * encoding that uses bytes with the high bit set is extremely
1059 * unlikely to pass a UTF-8 validity test"
1060 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
1061 * potential that we will get it wrong however, especially on short
1062 * error message text. (If it turns out to be necessary, we could
1063 * also keep track if the current LC_MESSAGES locale is UTF-8) */
1064 if (SvOK(sv) /* It could be that Strerror returned invalid */
1065 && ! is_ascii_string((U8*) SvPVX_const(sv), SvCUR(sv))
1066 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
1067 {
1068 SvUTF8_on(sv);
1069 }
1070 }
4ee39169 1071 RESTORE_ERRNO;
88e89b8a 1072 }
666d8aa2 1073
ad3296c6 1074 SvRTRIM(sv);
946ec16e 1075 SvNOK_on(sv); /* what a wonderful hack! */
79072805
LW
1076 break;
1077 case '<':
dfff4baf 1078 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1079 break;
1080 case '>':
dfff4baf 1081 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1082 break;
1083 case '(':
dfff4baf 1084 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1085 goto add_groups;
1086 case ')':
dfff4baf 1087 sv_setgid(sv, PerlProc_getegid());
79072805 1088 add_groups:
79072805 1089#ifdef HAS_GETGROUPS
79072805 1090 {
57d7c65e 1091 Groups_t *gary = NULL;
fb45abb2 1092 I32 i, num_groups = getgroups(0, gary);
57d7c65e
JC
1093 Newx(gary, num_groups, Groups_t);
1094 num_groups = getgroups(num_groups, gary);
fb45abb2
GA
1095 for (i = 0; i < num_groups; i++)
1096 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
57d7c65e 1097 Safefree(gary);
79072805 1098 }
155aba94 1099 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1100#endif
79072805 1101 break;
79072805
LW
1102 case '0':
1103 break;
1104 }
a0d0e21e 1105 return 0;
79072805
LW
1106}
1107
1108int
864dbfa3 1109Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1110{
8772537c 1111 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1112
7918f24d
NC
1113 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1114
79072805 1115 if (uf && uf->uf_val)
24f81a43 1116 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1117 return 0;
1118}
1119
1120int
864dbfa3 1121Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1122{
27da23d5 1123 dVAR;
9ae3433d 1124 STRLEN len = 0, klen;
12033064 1125 const char * const key = MgPV_const(mg,klen);
888a67f6 1126 const char *s = "";
1e422769 1127
7918f24d
NC
1128 PERL_ARGS_ASSERT_MAGIC_SETENV;
1129
613c63b4 1130 SvGETMAGIC(sv);
12033064 1131 if (SvOK(sv)) {
613c63b4
CS
1132 /* defined environment variables are byte strings; unfortunately
1133 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1134 (void)SvPV_force_nomg_nolen(sv);
1135 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1136 if (SvUTF8(sv)) {
1137 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1138 SvUTF8_off(sv);
1139 }
1140 s = SvPVX(sv);
1141 len = SvCUR(sv);
12033064
CS
1142 }
1143 my_setenv(key, s); /* does the deed */
1144
a0d0e21e
LW
1145#ifdef DYNAMIC_ENV_FETCH
1146 /* We just undefd an environment var. Is a replacement */
1147 /* waiting in the wings? */
1148 if (!len) {
6bd66ee9 1149 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1150 if (valp)
4ab59fcc 1151 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1152 }
1153#endif
1e422769 1154
39e571d4 1155#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1156 /* And you'll never guess what the dog had */
1157 /* in its mouth... */
284167a5 1158 if (TAINTING_get) {
1e422769
PP
1159 MgTAINTEDDIR_off(mg);
1160#ifdef VMS
6bd66ee9 1161 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
b8ffc8df 1162 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1163 int i = 0, j = 0;
1164
6fca0082 1165 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1166 elt = eltbuf;
1e422769
PP
1167 do { /* DCL$PATH may be a search list */
1168 while (1) { /* as may dev portion of any element */
1169 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1170 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1171 cando_by_name(S_IWUSR,0,elt) ) {
1172 MgTAINTEDDIR_on(mg);
1173 return 0;
1174 }
1175 }
bd61b366 1176 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1177 *cp = '\0';
1178 if (my_trnlnm(elt, eltbuf, j++))
1179 elt = eltbuf;
1180 else
1181 break;
1182 }
1183 j = 0;
1184 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1185 }
1186#endif /* VMS */
12033064 1187 if (s && klen == 4 && strEQ(key,"PATH")) {
8772537c 1188 const char * const strend = s + len;
463ee0b2
LW
1189
1190 while (s < strend) {
96827780 1191 char tmpbuf[256];
c623ac67 1192 Stat_t st;
5f74f29c 1193 I32 i;
f5a63d97
AL
1194#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1195 const char path_sep = '|';
1196#else
1197 const char path_sep = ':';
1198#endif
96827780 1199 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1200 s, strend, path_sep, &i);
463ee0b2 1201 s++;
bb7a0f54 1202 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB
1203#ifdef VMS
1204 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1205#else
1206 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1207#endif
c6ed36e1 1208 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1209 MgTAINTEDDIR_on(mg);
1e422769
PP
1210 return 0;
1211 }
463ee0b2 1212 }
79072805
LW
1213 }
1214 }
39e571d4 1215#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1216
79072805
LW
1217 return 0;
1218}
1219
1220int
864dbfa3 1221Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1222{
7918f24d 1223 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1224 PERL_UNUSED_ARG(sv);
bd61b366 1225 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1226 return 0;
1227}
1228
88e89b8a 1229int
864dbfa3 1230Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1231{
97aff369 1232 dVAR;
7918f24d 1233 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1234 PERL_UNUSED_ARG(mg);
b0269e46 1235#if defined(VMS)
cea2e8a9 1236 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1237#else
3280af22 1238 if (PL_localizing) {
fb73857a 1239 HE* entry;
b0269e46 1240 my_clearenv();
85fbaab2
NC
1241 hv_iterinit(MUTABLE_HV(sv));
1242 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1243 I32 keylen;
1244 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1245 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1246 }
1247 }
1248#endif
1249 return 0;
1250}
1251
1252int
864dbfa3 1253Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1254{
27da23d5 1255 dVAR;
7918f24d 1256 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1257 PERL_UNUSED_ARG(sv);
1258 PERL_UNUSED_ARG(mg);
b0269e46
AB
1259#if defined(VMS)
1260 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1261#else
1262 my_clearenv();
1263#endif
3e3baf6d 1264 return 0;
66b1d557
HM
1265}
1266
64ca3a65 1267#ifndef PERL_MICRO
2d4fcd5e
AJ
1268#ifdef HAS_SIGPROCMASK
1269static void
1270restore_sigmask(pTHX_ SV *save_sv)
1271{
0bd48802 1272 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1273 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1274}
1275#endif
66b1d557 1276int
864dbfa3 1277Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1278{
97aff369 1279 dVAR;
88e89b8a 1280 /* Are we fetching a signal entry? */
708854f2 1281 int i = (I16)mg->mg_private;
7918f24d
NC
1282
1283 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1284
708854f2 1285 if (!i) {
84c7b88c
BF
1286 STRLEN siglen;
1287 const char * sig = MgPV_const(mg, siglen);
1288 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1289 }
1290
e02bfb16 1291 if (i > 0) {
22c35a8c
GS
1292 if(PL_psig_ptr[i])
1293 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1294 else {
46da273f 1295 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1296#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1297 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1298 sigstate = SIG_IGN;
2e34cc90
CL
1299#endif
1300#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1301 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1302 sigstate = SIG_DFL;
85b332e2 1303#endif
88e89b8a 1304 /* cache state so we don't fetch it again */
8aad04aa 1305 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1306 sv_setpvs(sv,"IGNORE");
88e89b8a 1307 else
3280af22 1308 sv_setsv(sv,&PL_sv_undef);
46da273f 1309 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1310 SvTEMP_off(sv);
1311 }
1312 }
1313 return 0;
1314}
1315int
864dbfa3 1316Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1317{
7918f24d 1318 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1319
38a124f0 1320 magic_setsig(NULL, mg);
179c85a2 1321 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1322}
3d37d572 1323
0a8e0eff 1324Signal_t
8aad04aa 1325#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1326Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1327#else
0a8e0eff 1328Perl_csighandler(int sig)
8aad04aa 1329#endif
0a8e0eff 1330{
1018e26f
NIS
1331#ifdef PERL_GET_SIG_CONTEXT
1332 dTHXa(PERL_GET_SIG_CONTEXT);
1333#else
85b332e2
CL
1334 dTHX;
1335#endif
23ada85b 1336#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1337 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1338 if (PL_sig_ignoring[sig]) return;
85b332e2 1339#endif
2e34cc90 1340#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1341 if (PL_sig_defaulting[sig])
2e34cc90
CL
1342#ifdef KILL_BY_SIGPRC
1343 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1344#else
1345 exit(1);
1346#endif
1347#endif
406878dd 1348 if (
853d2c32
RGS
1349#ifdef SIGILL
1350 sig == SIGILL ||
1351#endif
1352#ifdef SIGBUS
1353 sig == SIGBUS ||
1354#endif
1355#ifdef SIGSEGV
1356 sig == SIGSEGV ||
1357#endif
1358 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1359 /* Call the perl level handler now--
31c91b43 1360 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1361#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1362 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1363#else
1364 (*PL_sighandlerp)(sig);
92807b6d 1365#endif
406878dd 1366 else {
31c91b43 1367 if (!PL_psig_pend) return;
406878dd
GA
1368 /* Set a flag to say this signal is pending, that is awaiting delivery after
1369 * the current Perl opcode completes */
1370 PL_psig_pend[sig]++;
1371
1372#ifndef SIG_PENDING_DIE_COUNT
1373# define SIG_PENDING_DIE_COUNT 120
1374#endif
fe13d51d 1375 /* Add one to say _a_ signal is pending */
406878dd
GA
1376 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1377 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1378 (unsigned long)SIG_PENDING_DIE_COUNT);
1379 }
0a8e0eff
NIS
1380}
1381
2e34cc90
CL
1382#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1383void
1384Perl_csighandler_init(void)
1385{
1386 int sig;
27da23d5 1387 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1388
1389 for (sig = 1; sig < SIG_SIZE; sig++) {
1390#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1391 dTHX;
27da23d5 1392 PL_sig_defaulting[sig] = 1;
5c1546dc 1393 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1394#endif
1395#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1396 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1397#endif
1398 }
27da23d5 1399 PL_sig_handlers_initted = 1;
2e34cc90
CL
1400}
1401#endif
1402
7fe50b8b
LT
1403#if defined HAS_SIGPROCMASK
1404static void
1405unblock_sigmask(pTHX_ void* newset)
1406{
1407 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1408}
1409#endif
1410
0a8e0eff
NIS
1411void
1412Perl_despatch_signals(pTHX)
1413{
97aff369 1414 dVAR;
0a8e0eff
NIS
1415 int sig;
1416 PL_sig_pending = 0;
1417 for (sig = 1; sig < SIG_SIZE; sig++) {
1418 if (PL_psig_pend[sig]) {
d0166017 1419 dSAVE_ERRNO;
7fe50b8b 1420#ifdef HAS_SIGPROCMASK
55534442
LT
1421 /* From sigaction(2) (FreeBSD man page):
1422 * | Signal routines normally execute with the signal that
1423 * | caused their invocation blocked, but other signals may
1424 * | yet occur.
1425 * Emulation of this behavior (from within Perl) is enabled
1426 * using sigprocmask
1427 */
1428 int was_blocked;
1429 sigset_t newset, oldset;
1430
1431 sigemptyset(&newset);
1432 sigaddset(&newset, sig);
1433 sigprocmask(SIG_BLOCK, &newset, &oldset);
1434 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1435 if (!was_blocked) {
1436 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1437 ENTER;
1438 SAVEFREESV(save_sv);
1439 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1440 }
55534442 1441#endif
25da4428 1442 PL_psig_pend[sig] = 0;
6e324d09 1443#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1444 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1445#else
1446 (*PL_sighandlerp)(sig);
92807b6d 1447#endif
7fe50b8b 1448#ifdef HAS_SIGPROCMASK
55534442 1449 if (!was_blocked)
7fe50b8b 1450 LEAVE;
55534442 1451#endif
d0166017 1452 RESTORE_ERRNO;
0a8e0eff
NIS
1453 }
1454 }
1455}
1456
38a124f0 1457/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1458int
864dbfa3 1459Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1460{
27da23d5 1461 dVAR;
79072805 1462 I32 i;
cbbf8932 1463 SV** svp = NULL;
2d4fcd5e
AJ
1464 /* Need to be careful with SvREFCNT_dec(), because that can have side
1465 * effects (due to closures). We must make sure that the new disposition
1466 * is in place before it is called.
1467 */
cbbf8932 1468 SV* to_dec = NULL;
e72dc28c 1469 STRLEN len;
2d4fcd5e
AJ
1470#ifdef HAS_SIGPROCMASK
1471 sigset_t set, save;
1472 SV* save_sv;
1473#endif
eb578fdb 1474 const char *s = MgPV_const(mg,len);
7918f24d
NC
1475
1476 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1477
748a9306 1478 if (*s == '_') {
84c7b88c 1479 if (memEQs(s, len, "__DIE__"))
3280af22 1480 svp = &PL_diehook;
84c7b88c 1481 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1482 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1483 /* Merge the existing behaviours, which are as follows:
1484 magic_setsig, we always set svp to &PL_warnhook
1485 (hence we always change the warnings handler)
1486 For magic_clearsig, we don't change the warnings handler if it's
1487 set to the &PL_warnhook. */
3280af22 1488 svp = &PL_warnhook;
84c7b88c
BF
1489 } else if (sv) {
1490 SV *tmp = sv_newmortal();
1491 Perl_croak(aTHX_ "No such hook: %s",
1492 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1493 }
748a9306 1494 i = 0;
38a124f0 1495 if (svp && *svp) {
9289f461
RGS
1496 if (*svp != PERL_WARNHOOK_FATAL)
1497 to_dec = *svp;
cbbf8932 1498 *svp = NULL;
4633a7c4 1499 }
748a9306
LW
1500 }
1501 else {
708854f2
NC
1502 i = (I16)mg->mg_private;
1503 if (!i) {
84c7b88c 1504 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1505 mg->mg_private = (U16)i;
708854f2 1506 }
86d86cad 1507 if (i <= 0) {
84c7b88c
BF
1508 if (sv) {
1509 SV *tmp = sv_newmortal();
1510 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1511 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1512 }
748a9306
LW
1513 return 0;
1514 }
2d4fcd5e
AJ
1515#ifdef HAS_SIGPROCMASK
1516 /* Avoid having the signal arrive at a bad time, if possible. */
1517 sigemptyset(&set);
1518 sigaddset(&set,i);
1519 sigprocmask(SIG_BLOCK, &set, &save);
1520 ENTER;
9ff8e806 1521 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1522 SAVEFREESV(save_sv);
1523 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1524#endif
1525 PERL_ASYNC_CHECK();
2e34cc90 1526#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1527 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1528#endif
23ada85b 1529#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1530 PL_sig_ignoring[i] = 0;
85b332e2 1531#endif
2e34cc90 1532#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1533 PL_sig_defaulting[i] = 0;
2e34cc90 1534#endif
2d4fcd5e 1535 to_dec = PL_psig_ptr[i];
38a124f0
NC
1536 if (sv) {
1537 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1538 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1539
1540 /* Signals don't change name during the program's execution, so once
1541 they're cached in the appropriate slot of PL_psig_name, they can
1542 stay there.
1543
1544 Ideally we'd find some way of making SVs at (C) compile time, or
1545 at least, doing most of the work. */
1546 if (!PL_psig_name[i]) {
1547 PL_psig_name[i] = newSVpvn(s, len);
1548 SvREADONLY_on(PL_psig_name[i]);
1549 }
38a124f0 1550 } else {
79fd3822 1551 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1552 PL_psig_name[i] = NULL;
1553 PL_psig_ptr[i] = NULL;
1554 }
748a9306 1555 }
38a124f0 1556 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1557 if (i) {
5c1546dc 1558 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1559 }
748a9306 1560 else
b37c2d43 1561 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1562 } else {
9dfa190b
NC
1563 if (sv && SvOK(sv)) {
1564 s = SvPV_force(sv, len);
1565 } else {
1566 sv = NULL;
1567 }
84c7b88c 1568 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1569 if (i) {
23ada85b 1570#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1571 PL_sig_ignoring[i] = 1;
1572 (void)rsignal(i, PL_csighandlerp);
85b332e2 1573#else
9dfa190b 1574 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1575#endif
9dfa190b 1576 }
2d4fcd5e 1577 }
84c7b88c 1578 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1579 if (i) {
2e34cc90 1580#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1581 PL_sig_defaulting[i] = 1;
1582 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1583#else
9dfa190b 1584 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1585#endif
9dfa190b
NC
1586 }
1587 }
1588 else {
1589 /*
1590 * We should warn if HINT_STRICT_REFS, but without
1591 * access to a known hint bit in a known OP, we can't
1592 * tell whether HINT_STRICT_REFS is in force or not.
1593 */
1594 if (!strchr(s,':') && !strchr(s,'\''))
1595 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1596 SV_GMAGIC);
1597 if (i)
1598 (void)rsignal(i, PL_csighandlerp);
1599 else
1600 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1601 }
748a9306 1602 }
9dfa190b 1603
2d4fcd5e
AJ
1604#ifdef HAS_SIGPROCMASK
1605 if(i)
1606 LEAVE;
1607#endif
ef8d46e8 1608 SvREFCNT_dec(to_dec);
79072805
LW
1609 return 0;
1610}
64ca3a65 1611#endif /* !PERL_MICRO */
79072805
LW
1612
1613int
864dbfa3 1614Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1615{
97aff369 1616 dVAR;
7918f24d 1617 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1618 PERL_UNUSED_ARG(sv);
e1a479c5 1619
89c14e2e 1620 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1621 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1622 return 0;
1623
0e446081 1624 return magic_clearisa(NULL, mg);
463ee0b2
LW
1625}
1626
0e446081 1627/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1628int
52b45067
RD
1629Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1630{
1631 dVAR;
1632 HV* stash;
1633
7918f24d
NC
1634 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1635
52b45067 1636 /* Bail out if destruction is going on */
627364f1 1637 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1638
0e446081
NC
1639 if (sv)
1640 av_clear(MUTABLE_AV(sv));
52b45067 1641
6624142a
FC
1642 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1643 /* This occurs with setisa_elem magic, which calls this
1644 same function. */
1645 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1646
1647 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1648 SV **svp = AvARRAY((AV *)mg->mg_obj);
1649 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1650 while (items--) {
1651 stash = GvSTASH((GV *)*svp++);
1652 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1653 }
1654
1655 return 0;
1656 }
1657
52b45067 1658 stash = GvSTASH(
6624142a 1659 (const GV *)mg->mg_obj
52b45067
RD
1660 );
1661
00169e2c
FC
1662 /* The stash may have been detached from the symbol table, so check its
1663 name before doing anything. */
1664 if (stash && HvENAME_get(stash))
5562fa71 1665 mro_isa_changed_in(stash);
52b45067
RD
1666
1667 return 0;
1668}
1669
1670int
864dbfa3 1671Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1672{
85fbaab2 1673 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1674 I32 i = 0;
7918f24d
NC
1675
1676 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1677 PERL_UNUSED_ARG(mg);
7719e241 1678
6ff81951 1679 if (hv) {
497b47a8 1680 (void) hv_iterinit(hv);
ad64d0ec 1681 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1682 i = HvUSEDKEYS(hv);
497b47a8
JH
1683 else {
1684 while (hv_iternext(hv))
1685 i++;
1686 }
6ff81951
GS
1687 }
1688
1689 sv_setiv(sv, (IV)i);
1690 return 0;
1691}
1692
1693int
864dbfa3 1694Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1695{
7918f24d 1696 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1697 PERL_UNUSED_ARG(mg);
946ec16e 1698 if (LvTARG(sv)) {
85fbaab2 1699 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1700 }
1701 return 0;
ac27b0f5 1702}
946ec16e 1703
efaf3674
DM
1704/*
1705=for apidoc magic_methcall
1706
1707Invoke a magic method (like FETCH).
1708
2baee27b
FC
1709C<sv> and C<mg> are the tied thingy and the tie magic.
1710
1711C<meth> is the name of the method to call.
1712
1713C<argc> is the number of args (in addition to $self) to pass to the method.
1714
1715The C<flags> can be:
1716
1717 G_DISCARD invoke method with G_DISCARD flag and don't
1718 return a value
1719 G_UNDEF_FILL fill the stack with argc pointers to
1720 PL_sv_undef
1721
1722The arguments themselves are any values following the C<flags> argument.
efaf3674
DM
1723
1724Returns the SV (if any) returned by the method, or NULL on failure.
1725
1726
1727=cut
1728*/
1729
1730SV*
36925d9e 1731Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1732 U32 argc, ...)
a0d0e21e 1733{
97aff369 1734 dVAR;
a0d0e21e 1735 dSP;
efaf3674 1736 SV* ret = NULL;
463ee0b2 1737
7918f24d
NC
1738 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1739
efaf3674 1740 ENTER;
d1d7a15d
NC
1741
1742 if (flags & G_WRITING_TO_STDERR) {
1743 SAVETMPS;
1744
1745 save_re_context();
1746 SAVESPTR(PL_stderrgv);
1747 PL_stderrgv = NULL;
1748 }
1749
efaf3674 1750 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1751 PUSHMARK(SP);
efaf3674 1752
67549bd2
NC
1753 EXTEND(SP, argc+1);
1754 PUSHs(SvTIED_obj(sv, mg));
1755 if (flags & G_UNDEF_FILL) {
1756 while (argc--) {
efaf3674 1757 PUSHs(&PL_sv_undef);
93965878 1758 }
67549bd2 1759 } else if (argc > 0) {
046b0c7d
NC
1760 va_list args;
1761 va_start(args, argc);
1762
1763 do {
1764 SV *const sv = va_arg(args, SV *);
1765 PUSHs(sv);
1766 } while (--argc);
1767
1768 va_end(args);
88e89b8a 1769 }
463ee0b2 1770 PUTBACK;
efaf3674 1771 if (flags & G_DISCARD) {
36925d9e 1772 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1773 }
1774 else {
36925d9e 1775 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1776 ret = *PL_stack_sp--;
1777 }
1778 POPSTACK;
d1d7a15d
NC
1779 if (flags & G_WRITING_TO_STDERR)
1780 FREETMPS;
efaf3674
DM
1781 LEAVE;
1782 return ret;
1783}
1784
efaf3674 1785/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1786
efaf3674 1787STATIC SV*
36925d9e 1788S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1789 int n, SV *val)
1790{
1791 dVAR;
1792 SV* arg1 = NULL;
1793
1794 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1795
1796 if (mg->mg_ptr) {
1797 if (mg->mg_len >= 0) {
db4b3a1d 1798 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1799 }
1800 else if (mg->mg_len == HEf_SVKEY)
1801 arg1 = MUTABLE_SV(mg->mg_ptr);
1802 }
1803 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1804 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1805 sv_2mortal(arg1);
1806 }
1807 if (!arg1) {
046b0c7d 1808 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1809 }
046b0c7d 1810 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1811}
1812
76e3520e 1813STATIC int
36925d9e 1814S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1815{
efaf3674
DM
1816 dVAR;
1817 SV* ret;
463ee0b2 1818
7918f24d
NC
1819 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1820
efaf3674
DM
1821 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1822 if (ret)
1823 sv_setsv(sv, ret);
a0d0e21e
LW
1824 return 0;
1825}
463ee0b2 1826
a0d0e21e 1827int
864dbfa3 1828Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1829{
7918f24d
NC
1830 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1831
fd69380d 1832 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1833 mg->mg_flags |= MGf_GSKIP;
36925d9e 1834 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1835 return 0;
1836}
1837
1838int
864dbfa3 1839Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1840{
efaf3674 1841 dVAR;
b112cff9
DM
1842 MAGIC *tmg;
1843 SV *val;
7918f24d
NC
1844
1845 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1846
b112cff9
DM
1847 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1848 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1849 * public flags indicate its value based on copying from $val. Doing
1850 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1851 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1852 * wrong if $val happened to be tainted, as sv hasn't got magic
1853 * enabled, even though taint magic is in the chain. In which case,
1854 * fake up a temporary tainted value (this is easier than temporarily
1855 * re-enabling magic on sv). */
1856
284167a5 1857 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
1858 && (tmg->mg_len & 1))
1859 {
1860 val = sv_mortalcopy(sv);
1861 SvTAINTED_on(val);
1862 }
1863 else
1864 val = sv;
1865
36925d9e 1866 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
1867 return 0;
1868}
1869
1870int
864dbfa3 1871Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1872{
7918f24d
NC
1873 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1874
4c13be3f 1875 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1876 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1877}
463ee0b2 1878
93965878
NIS
1879
1880U32
864dbfa3 1881Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1882{
efaf3674 1883 dVAR;
22846ab4 1884 I32 retval = 0;
efaf3674 1885 SV* retsv;
93965878 1886
7918f24d
NC
1887 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1888
36925d9e 1889 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
1890 if (retsv) {
1891 retval = SvIV(retsv)-1;
22846ab4
AB
1892 if (retval < -1)
1893 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1894 }
22846ab4 1895 return (U32) retval;
93965878
NIS
1896}
1897
cea2e8a9
GS
1898int
1899Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1900{
efaf3674 1901 dVAR;
463ee0b2 1902
7918f24d
NC
1903 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1904
36925d9e 1905 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
1906 return 0;
1907}
1908
1909int
864dbfa3 1910Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1911{
efaf3674
DM
1912 dVAR;
1913 SV* ret;
463ee0b2 1914
7918f24d
NC
1915 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1916
36925d9e
RZ
1917 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1918 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
1919 if (ret)
1920 sv_setsv(key,ret);
79072805
LW
1921 return 0;
1922}
1923
1924int
1146e912 1925Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1926{
7918f24d
NC
1927 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1928
36925d9e 1929 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1930}
a0d0e21e 1931
a3bcc51e
TP
1932SV *
1933Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1934{
efaf3674 1935 dVAR;
5fcbf73d 1936 SV *retval;
ad64d0ec
NC
1937 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1938 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1939
7918f24d
NC
1940 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1941
a3bcc51e
TP
1942 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1943 SV *key;
bfcb3514 1944 if (HvEITER_get(hv))
a3bcc51e
TP
1945 /* we are in an iteration so the hash cannot be empty */
1946 return &PL_sv_yes;
1947 /* no xhv_eiter so now use FIRSTKEY */
1948 key = sv_newmortal();
ad64d0ec 1949 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1950 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
1951 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1952 }
1953
1954 /* there is a SCALAR method that we can call */
36925d9e 1955 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 1956 if (!retval)
5fcbf73d 1957 retval = &PL_sv_undef;
a3bcc51e
TP
1958 return retval;
1959}
1960
a0d0e21e 1961int
864dbfa3 1962Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1963{
97aff369 1964 dVAR;
089b5c60 1965 SV **svp;
7918f24d
NC
1966
1967 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1968
089b5c60
NC
1969 /* The magic ptr/len for the debugger's hash should always be an SV. */
1970 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
1971 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
1972 mg->mg_len, mg->mg_ptr);
1973 }
1974
1975 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
1976 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
1977 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
1978 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 1979
8772537c
AL
1980 if (svp && SvIOKp(*svp)) {
1981 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1982 if (o) {
7bbbc3c0
NC
1983#ifdef PERL_DEBUG_READONLY_OPS
1984 Slab_to_rw(OpSLAB(o));
1985#endif
8772537c 1986 /* set or clear breakpoint in the relevant control op */
089b5c60 1987 if (SvTRUE(sv))
8772537c
AL
1988 o->op_flags |= OPf_SPECIAL;
1989 else
1990 o->op_flags &= ~OPf_SPECIAL;
7bbbc3c0
NC
1991#ifdef PERL_DEBUG_READONLY_OPS
1992 Slab_to_ro(OpSLAB(o));
1993#endif
8772537c 1994 }
5df8de69 1995 }
79072805
LW
1996 return 0;
1997}
1998
1999int
8772537c 2000Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2001{
97aff369 2002 dVAR;
502c6561 2003 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2004
2005 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2006
83bf042f 2007 if (obj) {
e1dccc0d 2008 sv_setiv(sv, AvFILL(obj));
83bf042f 2009 } else {
d4a823b3 2010 sv_setsv(sv, NULL);
83bf042f 2011 }
79072805
LW
2012 return 0;
2013}
2014
2015int
864dbfa3 2016Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2017{
97aff369 2018 dVAR;
502c6561 2019 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2020
2021 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2022
83bf042f 2023 if (obj) {
e1dccc0d 2024 av_fill(obj, SvIV(sv));
83bf042f 2025 } else {
a2a5de95
NC
2026 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2027 "Attempt to set length of freed array");
83bf042f
NC
2028 }
2029 return 0;
2030}
2031
2032int
83f29afa
VP
2033Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2034{
2035 dVAR;
2036
2037 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2038 PERL_UNUSED_ARG(sv);
2039
2040 /* Reset the iterator when the array is cleared */
3565fbf3
VP
2041#if IVSIZE == I32SIZE
2042 *((IV *) &(mg->mg_len)) = 0;
2043#else
83f29afa
VP
2044 if (mg->mg_ptr)
2045 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2046#endif
83f29afa
VP
2047
2048 return 0;
2049}
2050
2051int
83bf042f
NC
2052Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2053{
97aff369 2054 dVAR;
7918f24d
NC
2055
2056 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2057 PERL_UNUSED_ARG(sv);
7918f24d 2058
94f3782b
DM
2059 /* during global destruction, mg_obj may already have been freed */
2060 if (PL_in_clean_all)
1ea47f64 2061 return 0;
94f3782b 2062
83bf042f
NC
2063 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2064
2065 if (mg) {
2066 /* arylen scalar holds a pointer back to the array, but doesn't own a
2067 reference. Hence the we (the array) are about to go away with it
2068 still pointing at us. Clear its pointer, else it would be pointing
2069 at free memory. See the comment in sv_magic about reference loops,
2070 and why it can't own a reference to us. */
2071 mg->mg_obj = 0;
2072 }
a0d0e21e
LW
2073 return 0;
2074}
2075
2076int
864dbfa3 2077Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2078{
97aff369 2079 dVAR;
16eb5365 2080 SV* const lsv = LvTARG(sv);
96c2a8ff 2081 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2082
2083 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2084 PERL_UNUSED_ARG(mg);
ac27b0f5 2085
6174b39a
FC
2086 if (found && found->mg_len != -1) {
2087 STRLEN i = found->mg_len;
25fdce4a 2088 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2089 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2090 sv_setuv(sv, i);
a0d0e21e 2091 return 0;
a0d0e21e 2092 }
35995e5c 2093 sv_setsv(sv,NULL);
a0d0e21e
LW
2094 return 0;
2095}
2096
2097int
864dbfa3 2098Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2099{
97aff369 2100 dVAR;
16eb5365 2101 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2102 SSize_t pos;
2103 STRLEN len;
c00206c8 2104 STRLEN ulen = 0;
53d44271 2105 MAGIC* found;
aec43834 2106 const char *s;
a0d0e21e 2107
7918f24d 2108 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2109 PERL_UNUSED_ARG(mg);
ac27b0f5 2110
96c2a8ff 2111 found = mg_find_mglob(lsv);
3881461a 2112 if (!found) {
a0d0e21e
LW
2113 if (!SvOK(sv))
2114 return 0;
96c2a8ff 2115 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2116 }
2117 else if (!SvOK(sv)) {
3881461a 2118 found->mg_len = -1;
a0d0e21e
LW
2119 return 0;
2120 }
aec43834 2121 s = SvPV_const(lsv, len);
a0d0e21e 2122
e1dccc0d 2123 pos = SvIV(sv);
a0ed51b3 2124
7e2040f0 2125 if (DO_UTF8(lsv)) {
aec43834 2126 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2127 if (ulen)
2128 len = ulen;
a0ed51b3
LW
2129 }
2130
a0d0e21e
LW
2131 if (pos < 0) {
2132 pos += len;
2133 if (pos < 0)
2134 pos = 0;
2135 }
eb160463 2136 else if (pos > (SSize_t)len)
a0d0e21e 2137 pos = len;
a0ed51b3 2138
3881461a 2139 found->mg_len = pos;
25fdce4a 2140 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2141
79072805
LW
2142 return 0;
2143}
2144
2145int
864dbfa3 2146Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2147{
2148 STRLEN len;
35a4481c 2149 SV * const lsv = LvTARG(sv);
b83604b4 2150 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2151 STRLEN offs = LvTARGOFF(sv);
2152 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC
2153 const bool negoff = LvFLAGS(sv) & 1;
2154 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC
2155
2156 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2157 PERL_UNUSED_ARG(mg);
6ff81951 2158
83f78d1a 2159 if (!translate_substr_offsets(
4ddea69a 2160 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2161 negoff ? -(IV)offs : (IV)offs, !negoff,
2162 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2163 )) {
2164 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2165 sv_setsv_nomg(sv, &PL_sv_undef);
2166 return 0;
2167 }
2168
9aa983d2 2169 if (SvUTF8(lsv))
4ddea69a 2170 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2171 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2172 if (SvUTF8(lsv))
2ef4b674 2173 SvUTF8_on(sv);
6ff81951
GS
2174 return 0;
2175}
2176
2177int
864dbfa3 2178Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2179{
97aff369 2180 dVAR;
83f78d1a 2181 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2182 const char * const tmps = SvPV_const(sv, len);
dd374669 2183 SV * const lsv = LvTARG(sv);
777f7c56
EB
2184 STRLEN lvoff = LvTARGOFF(sv);
2185 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC
2186 const bool negoff = LvFLAGS(sv) & 1;
2187 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC
2188
2189 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2190 PERL_UNUSED_ARG(mg);
075a4a2b 2191
a74fb2cd
FC
2192 SvGETMAGIC(lsv);
2193 if (SvROK(lsv))
2194 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2195 "Attempt to use reference as lvalue in substr"
2196 );
fc061ed8
FC
2197 SvPV_force_nomg(lsv,lsv_len);
2198 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2199 if (!translate_substr_offsets(
2200 lsv_len,
2201 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2202 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2203 ))
2204 Perl_croak(aTHX_ "substr outside of string");
2205 oldtarglen = lvlen;
1aa99e6b 2206 if (DO_UTF8(sv)) {
73a087f0 2207 sv_utf8_upgrade_nomg(lsv);
d931b1be 2208 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2209 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2210 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2211 SvUTF8_on(lsv);
2212 }
0d336106 2213 else if (SvUTF8(lsv)) {
5fcbf73d 2214 const char *utf8;
d931b1be 2215 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2216 newtarglen = len;
5fcbf73d 2217 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2218 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2219 Safefree(utf8);
1aa99e6b 2220 }
b76f3ce2 2221 else {
a74fb2cd 2222 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2223 newtarglen = len;
b76f3ce2 2224 }
83f78d1a
FC
2225 if (!neglen) LvTARGLEN(sv) = newtarglen;
2226 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2227
79072805
LW
2228 return 0;
2229}
2230
2231int
864dbfa3 2232Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2233{
97aff369 2234 dVAR;
7918f24d
NC
2235
2236 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2237 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2238#ifdef NO_TAINT_SUPPORT
2239 PERL_UNUSED_ARG(mg);
2240#endif
7918f24d 2241
27cc343c 2242 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW
2243 return 0;
2244}
2245
2246int
864dbfa3 2247Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2248{
97aff369 2249 dVAR;
7918f24d
NC
2250
2251 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2252 PERL_UNUSED_ARG(sv);
7918f24d 2253
b01e650a 2254 /* update taint status */
284167a5 2255 if (TAINT_get)
b01e650a
DM
2256 mg->mg_len |= 1;
2257 else
2258 mg->mg_len &= ~1;
463ee0b2
LW
2259 return 0;
2260}
2261
2262int
864dbfa3 2263Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2264{
35a4481c 2265 SV * const lsv = LvTARG(sv);
7918f24d
NC
2266
2267 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2268 PERL_UNUSED_ARG(mg);
6ff81951 2269
2e9e14dd 2270 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2271
6ff81951
GS
2272 return 0;
2273}
2274
2275int
864dbfa3 2276Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2277{
7918f24d 2278 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2279 PERL_UNUSED_ARG(mg);
79072805
LW
2280 do_vecset(sv); /* XXX slurp this routine */
2281 return 0;
2282}
2283
13733cde
FC
2284SV *
2285Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2286{
97aff369 2287 dVAR;
a0714e2c 2288 SV *targ = NULL;
13733cde
FC
2289 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2290 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2291 assert(mg);
5f05dabc 2292 if (LvTARGLEN(sv)) {
68dc0745 2293 if (mg->mg_obj) {
8772537c 2294 SV * const ahv = LvTARG(sv);
85fbaab2 2295 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2296 if (he)
2297 targ = HeVAL(he);
68dc0745 2298 }
bbfdc870 2299 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2300 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870
FC
2301 if (LvSTARGOFF(sv) <= AvFILL(av))
2302 targ = AvARRAY(av)[LvSTARGOFF(sv)];
68dc0745 2303 }
46da273f 2304 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2305 /* somebody else defined it for us */
2306 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2307 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2308 LvTARGLEN(sv) = 0;
2309 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2310 mg->mg_obj = NULL;
68dc0745
PP
2311 mg->mg_flags &= ~MGf_REFCOUNTED;
2312 }
13733cde 2313 return targ;
5f05dabc 2314 }
71be2cbc 2315 else
13733cde
FC
2316 return LvTARG(sv);
2317}
2318
2319int
2320Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2321{
2322 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2323
2324 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2325 return 0;
2326}
2327
2328int
864dbfa3 2329Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2330{
7918f24d 2331 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2332 PERL_UNUSED_ARG(mg);
71be2cbc 2333 if (LvTARGLEN(sv))
68dc0745
PP
2334 vivify_defelem(sv);
2335 if (LvTARG(sv)) {
5f05dabc 2336 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2337 SvSETMAGIC(LvTARG(sv));
2338 }
5f05dabc
PP
2339 return 0;
2340}
2341
71be2cbc 2342void
864dbfa3 2343Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2344{
97aff369 2345 dVAR;
74e13ce4 2346 MAGIC *mg;
a0714e2c 2347 SV *value = NULL;
71be2cbc 2348
7918f24d
NC
2349 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2350
14befaf4 2351 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2352 return;
68dc0745 2353 if (mg->mg_obj) {
8772537c 2354 SV * const ahv = LvTARG(sv);
85fbaab2 2355 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2356 if (he)
2357 value = HeVAL(he);
3280af22 2358 if (!value || value == &PL_sv_undef)
be2597df 2359 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2360 }
bbfdc870
FC
2361 else if (LvSTARGOFF(sv) < 0)
2362 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2363 else {
502c6561 2364 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2365 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2366 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2367 else {
bbfdc870 2368 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2369 if (!svp || !(value = *svp))
bbfdc870 2370 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2371 }
2372 }
b37c2d43 2373 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2374 SvREFCNT_dec(LvTARG(sv));
2375 LvTARG(sv) = value;
71be2cbc 2376 LvTARGLEN(sv) = 0;
68dc0745 2377 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2378 mg->mg_obj = NULL;
68dc0745 2379 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2380}
2381
2382int
864dbfa3 2383Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2384{
7918f24d 2385 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2386 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2387 return 0;
810b8aa5
GS
2388}
2389
2390int
864dbfa3 2391Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2392{
7918f24d 2393 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2394 PERL_UNUSED_CONTEXT;
0177730e 2395 PERL_UNUSED_ARG(sv);
565764a8 2396 mg->mg_len = -1;
93a17b20
LW
2397 return 0;
2398}
2399
2400int
864dbfa3 2401Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2402{
35a4481c 2403 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2404
7918f24d
NC
2405 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2406
79072805 2407 if (uf && uf->uf_set)
24f81a43 2408 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2409 return 0;
2410}
2411
c277df42 2412int
faf82a0b
AE
2413Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2414{
488344d2 2415 const char type = mg->mg_type;
7918f24d
NC
2416
2417 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2418
488344d2
NC
2419 if (type == PERL_MAGIC_qr) {
2420 } else if (type == PERL_MAGIC_bm) {
2421 SvTAIL_off(sv);
2422 SvVALID_off(sv);
2423 } else {
2424 assert(type == PERL_MAGIC_fm);
488344d2
NC
2425 }
2426 return sv_unmagic(sv, type);
faf82a0b
AE
2427}
2428
7a4c00b4 2429#ifdef USE_LOCALE_COLLATE
79072805 2430int
864dbfa3 2431Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2432{
7918f24d
NC
2433 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2434
bbce6d69 2435 /*
838b5b74 2436 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2437 * and vanished with a faint plop.
2438 */
96a5add6 2439 PERL_UNUSED_CONTEXT;
8772537c 2440 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2441 if (mg->mg_ptr) {
2442 Safefree(mg->mg_ptr);
2443 mg->mg_ptr = NULL;
565764a8 2444 mg->mg_len = -1;
7a4c00b4 2445 }
bbce6d69
PP
2446 return 0;
2447}
7a4c00b4 2448#endif /* USE_LOCALE_COLLATE */
bbce6d69 2449
7e8c5dac
HS
2450/* Just clear the UTF-8 cache data. */
2451int
2452Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2453{
7918f24d 2454 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2455 PERL_UNUSED_CONTEXT;
8772537c 2456 PERL_UNUSED_ARG(sv);
7e8c5dac 2457 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2458 mg->mg_ptr = NULL;
7e8c5dac
HS
2459 mg->mg_len = -1; /* The mg_len holds the len cache. */
2460 return 0;
2461}
2462
bbce6d69 2463int
864dbfa3 2464Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2465{
97aff369 2466 dVAR;
eb578fdb
KW
2467 const char *s;
2468 I32 paren;
2469 const REGEXP * rx;
79072805 2470 I32 i;
8990e307 2471 STRLEN len;
125b9982 2472 MAGIC *tmg;
2fdbfb4d 2473
7918f24d
NC
2474 PERL_ARGS_ASSERT_MAGIC_SET;
2475
e91d8259 2476 if (!mg->mg_ptr) {
960b831f 2477 paren = mg->mg_len;
1e05feb3 2478 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2479 setparen_got_rx:
2fdbfb4d 2480 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2481 } else {
2fdbfb4d
AB
2482 /* Croak with a READONLY error when a numbered match var is
2483 * set without a previous pattern match. Unless it's C<local $1>
2484 */
e91d8259 2485 croakparen:
2fdbfb4d 2486 if (!PL_localizing) {
cb077ed2 2487 Perl_croak_no_modify();
2fdbfb4d
AB
2488 }
2489 }
e91d8259
NC
2490 return 0;
2491 }
2492
2493 switch (*mg->mg_ptr) {
748a9306 2494 case '\001': /* ^A */
f2da823f
FC
2495 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2496 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2497 FmLINES(PL_bodytarget) = 0;
2498 if (SvPOK(PL_bodytarget)) {
2499 char *s = SvPVX(PL_bodytarget);
2500 while ( ((s = strchr(s, '\n'))) ) {
2501 FmLINES(PL_bodytarget)++;
2502 s++;
2503 }
2504 }
125b9982 2505 /* mg_set() has temporarily made sv non-magical */
284167a5 2506 if (TAINTING_get) {
125b9982
NT
2507 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2508 SvTAINTED_on(PL_bodytarget);
2509 else
2510 SvTAINTED_off(PL_bodytarget);
2511 }
748a9306 2512 break;
49460fe6 2513 case '\003': /* ^C */
f2338a2e 2514 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2515 break;
2516
79072805 2517 case '\004': /* ^D */
b4ab917c 2518#ifdef DEBUGGING
b83604b4 2519 s = SvPV_nolen_const(sv);
ddcf8bc1 2520 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS
2521 if (DEBUG_x_TEST || DEBUG_B_TEST)
2522 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2523#else
38ab35f8 2524 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2525#endif
79072805 2526 break;
28f23441 2527 case '\005': /* ^E */
d0063567 2528 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2529#ifdef VMS
38ab35f8 2530 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2531#else
2532# ifdef WIN32
d0063567 2533 SetLastError( SvIV(sv) );
e37778c2
NC
2534# else
2535# ifdef OS2
38ab35f8 2536 os2_setsyserrno(SvIV(sv));
e37778c2 2537# else
d0063567 2538 /* will anyone ever use this? */
38ab35f8 2539 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2540# endif
2541# endif
22fae026 2542#endif
d0063567
DK
2543 }
2544 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
ef8d46e8 2545 SvREFCNT_dec(PL_encoding);
d0063567
DK
2546 if (SvOK(sv) || SvGMAGICAL(sv)) {
2547 PL_encoding = newSVsv(sv);
2548 }
2549 else {
a0714e2c 2550 PL_encoding = NULL;
d0063567
DK
2551 }
2552 }
2553 break;
79072805 2554 case '\006': /* ^F */
38ab35f8 2555 PL_maxsysfd = SvIV(sv);
79072805 2556 break;
a0d0e21e 2557 case '\010': /* ^H */
38ab35f8 2558 PL_hints = SvIV(sv);
a0d0e21e 2559 break;
9d116dd7 2560 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2561 Safefree(PL_inplace);
bd61b366 2562 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2563 break;
d9bad346
FC
2564 case '\016': /* ^N */
2565 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2566 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2567 goto croakparen;
28f23441 2568 case '\017': /* ^O */
ac27b0f5 2569 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2570 Safefree(PL_osname);
bd61b366 2571 PL_osname = NULL;
3511154c
DM
2572 if (SvOK(sv)) {
2573 TAINT_PROPER("assigning to $^O");
2e0de35c 2574 PL_osname = savesvpv(sv);
3511154c 2575 }
ac27b0f5
NIS
2576 }
2577 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2578 STRLEN len;
2579 const char *const start = SvPV(sv, len);
b54fc2b6 2580 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2581 SV *tmp;
8b850bd5
NC
2582
2583
2584 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2585 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2586
2587 /* Opening for input is more common than opening for output, so
2588 ensure that hints for input are sooner on linked list. */
59cd0e26 2589 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2590 SvUTF8(sv))
2591 : newSVpvs_flags("", SvUTF8(sv));
2592 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2593 mg_set(tmp);
8b850bd5 2594
f747ebd6
Z
2595 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2596 SvUTF8(sv));
2597 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2598 mg_set(tmp);
ac27b0f5 2599 }
28f23441 2600 break;
79072805 2601 case '\020': /* ^P */
2fdbfb4d
AB
2602 PL_perldb = SvIV(sv);
2603 if (PL_perldb && !PL_DBsingle)
2604 init_debugger();
9b9e0be4 2605 break;
79072805 2606 case '\024': /* ^T */
88e89b8a 2607#ifdef BIG_TIME
6b88bc9c 2608 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2609#else
38ab35f8 2610 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2611#endif
79072805 2612 break;
e07ea26a
NC
2613 case '\025': /* ^UTF8CACHE */
2614 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2615 PL_utf8cache = (signed char) sv_2iv(sv);
2616 }
2617 break;
fde18df1 2618 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2619 if (*(mg->mg_ptr+1) == '\0') {
2620 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2621 i = SvIV(sv);
ac27b0f5 2622 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2623 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2624 }
599cee73 2625 }
0a378802 2626 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2627 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2628 if (!SvPOK(sv)) {
2629 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2630 break;
2631 }
f4fc7782 2632 {
b5477537 2633 STRLEN len, i;
d3a7d8c7 2634 int accumulate = 0 ;
f4fc7782 2635 int any_fatals = 0 ;
b83604b4 2636 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2637 for (i = 0 ; i < len ; ++i) {
2638 accumulate |= ptr[i] ;
2639 any_fatals |= (ptr[i] & 0xAA) ;
2640 }
4243c432
NC
2641 if (!accumulate) {
2642 if (!specialWARN(PL_compiling.cop_warnings))
2643 PerlMemShared_free(PL_compiling.cop_warnings);
2644 PL_compiling.cop_warnings = pWARN_NONE;
2645 }
72dc9ed5 2646 /* Yuck. I can't see how to abstract this: */
2f3f0b56
KW
2647 else if (isWARN_on(
2648 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2649 WARN_ALL)
2650 && !any_fatals)
2651 {
4243c432
NC
2652 if (!specialWARN(PL_compiling.cop_warnings))
2653 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH
2654 PL_compiling.cop_warnings = pWARN_ALL;
2655 PL_dowarn |= G_WARN_ONCE ;
727405f8 2656 }
d3a7d8c7 2657 else {
72dc9ed5
NC
2658 STRLEN len;
2659 const char *const p = SvPV_const(sv, len);
2660
2661 PL_compiling.cop_warnings
8ee4cf24 2662 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2663 p, len);
2664
d3a7d8c7
GS
2665 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2666 PL_dowarn |= G_WARN_ONCE ;
2667 }
f4fc7782 2668
d3a7d8c7 2669 }
4438c4b7 2670 }
971a9dd3 2671 }
79072805
LW
2672 break;
2673 case '.':
3280af22
NIS
2674 if (PL_localizing) {
2675 if (PL_localizing == 1)
7766f137 2676 SAVESPTR(PL_last_in_gv);
748a9306 2677 }
3280af22 2678 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2679 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2680 break;
2681 case '^':
acbe1b9d
FC
2682 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2683 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2684 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2685 break;
2686 case '~':
acbe1b9d
FC
2687 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2688 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2689 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2690 break;
2691 case '=':
acbe1b9d 2692 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2693 break;
2694 case '-':
acbe1b9d
FC
2695 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2696 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2697 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2698 break;
2699 case '%':
acbe1b9d 2700 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2701 break;
2702 case '|':
4b65379b 2703 {
099be4f1 2704 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2705 if(!io)
2706 break;
38ab35f8 2707 if ((SvIV(sv)) == 0)
4b65379b
CS
2708 IoFLAGS(io) &= ~IOf_FLUSH;
2709 else {
2710 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2711 PerlIO *ofp = IoOFP(io);
2712 if (ofp)
2713 (void)PerlIO_flush(ofp);
2714 IoFLAGS(io) |= IOf_FLUSH;
2715 }
2716 }
79072805
LW
2717 }
2718 break;
79072805 2719 case '/':
3280af22 2720 SvREFCNT_dec(PL_rs);
8bfdd7d9 2721 PL_rs = newSVsv(sv);
79072805
LW
2722 break;
2723 case '\\':
ef8d46e8 2724 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2725 if (SvOK(sv)) {
7889fe52 2726 PL_ors_sv = newSVsv(sv);
009c130f 2727 }
e3c19b7b 2728 else {
a0714e2c 2729 PL_ors_sv = NULL;
e3c19b7b 2730 }
79072805 2731 break;
7d69d4a6
FC
2732 case '[':
2733 if (SvIV(sv) != 0)
2734 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2735 break;
79072805 2736 case '?':
ff0cee69 2737#ifdef COMPLEX_STATUS
6b88bc9c 2738 if (PL_localizing == 2) {
41cb7b2b 2739 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2740 PL_statusvalue = LvTARGOFF(sv);
2741 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2742 }
2743 else
2744#endif
2745#ifdef VMSISH_STATUS
2746 if (VMSISH_STATUS)
fb38d079 2747 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2748 else
2749#endif
38ab35f8 2750 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2751 break;
2752 case '!':
93189314
JH
2753 {
2754#ifdef VMS
2755# define PERL_VMS_BANG vaxc$errno
2756#else
2757# define PERL_VMS_BANG 0
2758#endif
27329181 2759#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
2760 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2761 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2762#else
91487cfc 2763 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2764 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2765#endif
93189314 2766 }
79072805
LW
2767 break;
2768 case '<':
985213f2 2769 {
dfff4baf 2770 const Uid_t new_uid = SvUID(sv);
985213f2 2771 PL_delaymagic_uid = new_uid;
3280af22
NIS
2772 if (PL_delaymagic) {
2773 PL_delaymagic |= DM_RUID;
79072805
LW
2774 break; /* don't do magic till later */
2775 }
2776#ifdef HAS_SETRUID
dfff4baf 2777 (void)setruid(new_uid);
79072805
LW
2778#else
2779#ifdef HAS_SETREUID
dfff4baf 2780 (void)setreuid(new_uid, (Uid_t)-1);
748a9306 2781#else
85e6fe83 2782#ifdef HAS_SETRESUID
dfff4baf 2783 (void)setresuid(new_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2784#else
985213f2 2785 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2786#ifdef PERL_DARWIN
2787 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2788 if (new_uid != 0 && PerlProc_getuid() == 0)
75870ed3 2789 (void)PerlProc_setuid(0);
2790#endif
985213f2 2791 (void)PerlProc_setuid(new_uid);
75870ed3 2792 } else {
cea2e8a9 2793 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2794 }
79072805
LW
2795#endif
2796#endif
85e6fe83 2797#endif
79072805 2798 break;
985213f2 2799 }
79072805 2800 case '>':
985213f2 2801 {
dfff4baf 2802 const Uid_t new_euid = SvUID(sv);
985213f2 2803 PL_delaymagic_euid = new_euid;
3280af22
NIS
2804 if (PL_delaymagic) {
2805 PL_delaymagic |= DM_EUID;
79072805
LW
2806 break; /* don't do magic till later */
2807 }
2808#ifdef HAS_SETEUID
dfff4baf 2809 (void)seteuid(new_euid);
79072805
LW
2810#else
2811#ifdef HAS_SETREUID
dfff4baf 2812 (void)setreuid((Uid_t)-1, new_euid);
85e6fe83
LW
2813#else
2814#ifdef HAS_SETRESUID
dfff4baf 2815 (void)setresuid((Uid_t)-1, new_euid, (Uid_t)-1);
79072805 2816#else
985213f2 2817 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
382669a9 2818 PerlProc_setuid(new_euid);
a0d0e21e 2819 else {
cea2e8a9 2820 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2821 }
79072805
LW
2822#endif
2823#endif
85e6fe83 2824#endif
79072805 2825 break;
985213f2 2826 }
79072805 2827 case '(':
985213f2 2828 {
dfff4baf 2829 const Gid_t new_gid = SvGID(sv);
985213f2 2830 PL_delaymagic_gid = new_gid;
3280af22
NIS
2831 if (PL_delaymagic) {
2832 PL_delaymagic |= DM_RGID;
79072805
LW
2833 break; /* don't do magic till later */
2834 }
2835#ifdef HAS_SETRGID
dfff4baf 2836 (void)setrgid(new_gid);
79072805
LW
2837#else
2838#ifdef HAS_SETREGID
dfff4baf 2839 (void)setregid(new_gid, (Gid_t)-1);
85e6fe83
LW
2840#else
2841#ifdef HAS_SETRESGID
dfff4baf 2842 (void)setresgid(new_gid, (Gid_t)-1, (Gid_t) -1);
79072805 2843#else
985213f2
AB
2844 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
2845 (void)PerlProc_setgid(new_gid);
748a9306 2846 else {
cea2e8a9 2847 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2848 }
79072805
LW
2849#endif
2850#endif
85e6fe83 2851#endif
79072805 2852 break;
985213f2 2853 }
79072805 2854 case ')':
985213f2 2855 {
dfff4baf 2856 Gid_t new_egid;
5cd24f17
PP
2857#ifdef HAS_SETGROUPS
2858 {
b83604b4 2859 const char *p = SvPV_const(sv, len);
757f63d8 2860 Groups_t *gary = NULL;
fb4089e0 2861#ifdef _SC_NGROUPS_MAX
2862 int maxgrp = sysconf(_SC_NGROUPS_MAX);
2863
2864 if (maxgrp < 0)
2865 maxgrp = NGROUPS;
2866#else
2867 int maxgrp = NGROUPS;
2868#endif
757f63d8
SP
2869
2870 while (isSPACE(*p))
2871 ++p;
dfff4baf 2872 new_egid = (Gid_t)Atol(p);
fb4089e0 2873 for (i = 0; i < maxgrp; ++i) {
757f63d8
SP
2874 while (*p && !isSPACE(*p))
2875 ++p;
2876 while (isSPACE(*p))
2877 ++p;
2878 if (!*p)
2879 break;
2880 if(!gary)
2881 Newx(gary, i + 1, Groups_t);
2882 else
2883 Renew(gary, i + 1, Groups_t);
dfff4baf 2884 gary[i] = (Groups_t)Atol(p);
757f63d8
SP
2885 }
2886 if (i)
2887 (void)setgroups(i, gary);
f5a63d97 2888 Safefree(gary);
5cd24f17
PP
2889 }
2890#else /* HAS_SETGROUPS */
dfff4baf 2891 new_egid = SvGID(sv);
5cd24f17 2892#endif /* HAS_SETGROUPS */
985213f2 2893 PL_delaymagic_egid = new_egid;
3280af22
NIS
2894 if (PL_delaymagic) {
2895 PL_delaymagic |= DM_EGID;
79072805
LW
2896 break; /* don't do magic till later */
2897 }
2898#ifdef HAS_SETEGID
dfff4baf 2899 (void)setegid(new_egid);
79072805
LW
2900#else
2901#ifdef HAS_SETREGID
dfff4baf 2902 (void)setregid((Gid_t)-1, new_egid);
85e6fe83
LW
2903#else
2904#ifdef HAS_SETRESGID
dfff4baf 2905 (void)setresgid((Gid_t)-1, new_egid, (Gid_t)-1);
79072805 2906#else
985213f2
AB
2907 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
2908 (void)PerlProc_setgid(new_egid);
748a9306 2909 else {
cea2e8a9 2910 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2911 }
79072805
LW
2912#endif
2913#endif
85e6fe83 2914#endif
79072805 2915 break;
985213f2 2916 }
79072805 2917 case ':':
2d8e6c8d 2918 PL_chopset = SvPV_force(sv,len);
79072805 2919 break;
9cdac2a2
FC
2920 case '$': /* $$ */
2921 /* Store the pid in mg->mg_obj so we can tell when a fork has
2922 occurred. mg->mg_obj points to *$ by default, so clear it. */
2923 if (isGV(mg->mg_obj)) {
2924 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
2925 SvREFCNT_dec(mg->mg_obj);
2926 mg->mg_flags |= MGf_REFCOUNTED;
2927 mg->mg_obj = newSViv((IV)PerlProc_getpid());
2928 }
2929 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
2930 break;
79072805 2931 case '0':
e2975953 2932 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS
2933#ifdef HAS_SETPROCTITLE
2934 /* The BSDs don't show the argv[] in ps(1) output, they
2935 * show a string from the process struct and provide
2936 * the setproctitle() routine to manipulate that. */
a2722ac9 2937 if (PL_origalen != 1) {
b83604b4 2938 s = SvPV_const(sv, len);
98b76f99 2939# if __FreeBSD_version > 410001
9aad2c0e 2940 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS
2941 * but not the "(perl) suffix from the ps(1)
2942 * output, because that's what ps(1) shows if the
2943 * argv[] is modified. */
6f2ad931 2944 setproctitle("-%s", s);
9aad2c0e 2945# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS
2946 /* This doesn't really work if you assume that
2947 * $0 = 'foobar'; will wipe out 'perl' from the $0
2948 * because in ps(1) output the result will be like
2949 * sprintf("perl: %s (perl)", s)
2950 * I guess this is a security feature:
2951 * one (a user process) cannot get rid of the original name.
2952 * --jhi */
2953 setproctitle("%s", s);
2954# endif
2955 }
9d3968b2 2956#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 2957 if (PL_origalen != 1) {
17aa7f3d 2958 union pstun un;
b83604b4 2959 s = SvPV_const(sv, len);
6867be6d 2960 un.pst_command = (char *)s;
17aa7f3d
JH
2961 pstat(PSTAT_SETCMD, un, len, 0, 0);
2962 }
9d3968b2 2963#else
2d2af554
GA
2964 if (PL_origalen > 1) {
2965 /* PL_origalen is set in perl_parse(). */
2966 s = SvPV_force(sv,len);
2967 if (len >= (STRLEN)PL_origalen-1) {
2968 /* Longer than original, will be truncated. We assume that
2969 * PL_origalen bytes are available. */
2970 Copy(s, PL_origargv[0], PL_origalen-1, char);
2971 }
2972 else {
2973 /* Shorter than original, will be padded. */
235ac35d 2974#ifdef PERL_DARWIN
60777a0d
JH
2975 /* Special case for Mac OS X: see [perl #38868] */
2976 const int pad = 0;
235ac35d 2977#else
8a89a4f1
MB
2978 /* Is the space counterintuitive? Yes.
2979 * (You were expecting \0?)
2980 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2981 * --jhi */
60777a0d 2982 const int pad = ' ';
235ac35d 2983#endif
60777a0d
JH
2984 Copy(s, PL_origargv[0], len, char);
2985 PL_origargv[0][len] = 0;
2986 memset(PL_origargv[0] + len + 1,
2987 pad, PL_origalen - len - 1);
2d2af554
GA
2988 }
2989 PL_origargv[0][PL_origalen-1] = 0;
2990 for (i = 1; i < PL_origargc; i++)
2991 PL_origargv[i] = 0;
7636ea95
AB
2992#ifdef HAS_PRCTL_SET_NAME
2993 /* Set the legacy process name in addition to the POSIX name on Linux */
2994 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2995 /* diag_listed_as: SKIPME */
2996 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2997 }
2998#endif
79072805 2999 }
9d3968b2 3000#endif
e2975953 3001 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3002 break;
3003 }
3004 return 0;
3005}
3006
3007I32
84c7b88c
BF
3008Perl_whichsig_sv(pTHX_ SV *sigsv)
3009{
3010 const char *sigpv;
3011 STRLEN siglen;
3012 PERL_ARGS_ASSERT_WHICHSIG_SV;
3013 PERL_UNUSED_CONTEXT;
3014 sigpv = SvPV_const(sigsv, siglen);
3015 return whichsig_pvn(sigpv, siglen);
3016}
3017
3018I32
3019Perl_whichsig_pv(pTHX_ const char *sig)
3020{
3021 PERL_ARGS_ASSERT_WHICHSIG_PV;
3022 PERL_UNUSED_CONTEXT;
3023 return whichsig_pvn(sig, strlen(sig));
3024}
3025
3026I32
3027Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3028{
eb578fdb 3029 char* const* sigv;
7918f24d 3030
84c7b88c 3031 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3032 PERL_UNUSED_CONTEXT;
79072805 3033
aadb217d 3034 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3035 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3036 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3037#ifdef SIGCLD
84c7b88c 3038 if (memEQs(sig, len, "CHLD"))
79072805
LW
3039 return SIGCLD;
3040#endif
3041#ifdef SIGCHLD
84c7b88c 3042 if (memEQs(sig, len, "CLD"))
79072805
LW
3043 return SIGCHLD;
3044#endif
7f1236c0 3045 return -1;
79072805
LW
3046}
3047
ecfc5424 3048Signal_t
1e82f5a6 3049#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3050Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3051#else
3052Perl_sighandler(int sig)
3053#endif
79072805 3054{
1018e26f
NIS
3055#ifdef PERL_GET_SIG_CONTEXT
3056 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3057#else
cea2e8a9 3058 dTHX;
71d280e3 3059#endif
79072805 3060 dSP;
a0714e2c
SS
3061 GV *gv = NULL;
3062 SV *sv = NULL;
8772537c 3063 SV * const tSv = PL_Sv;
601f1833 3064 CV *cv = NULL;
533c011a 3065 OP *myop = PL_op;
84902520 3066 U32 flags = 0;
8772537c 3067 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3068 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3069 SV *errsv_save = NULL;
71d280e3 3070
84902520 3071
727405f8 3072 if (!PL_psig_ptr[sig]) {
99ef548b 3073 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3074 PL_sig_name[sig]);
3075 exit(sig);
3076 }
ff0cee69 3077
a0d63a7b
DM
3078 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3079 /* Max number of items pushed there is 3*n or 4. We cannot fix
3080 infinity, so we fix 4 (in fact 5): */
3081 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3082 flags |= 1;
3083 PL_savestack_ix += 5; /* Protect save in progress. */
3084 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3085 }
84902520 3086 }
84902520 3087 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3088 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3089 || SvTYPE(cv) != SVt_PVCV) {
3090 HV *st;
f2c0649b 3091 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3092 }
84902520 3093
a0d0e21e 3094 if (!cv || !CvROOT(cv)) {
a2a5de95
NC
3095 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
3096 PL_sig_name[sig], (gv ? GvENAME(gv)
3097 : ((cv && CvGV(cv))
3098 ? GvENAME(CvGV(cv))
3099 : "__ANON__")));
00d579c5 3100 goto cleanup;
79072805
LW
3101 }
3102
0c4d3b5e
DM
3103 sv = PL_psig_name[sig]
3104 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3105 : newSVpv(PL_sig_name[sig],0);
72048cfe 3106 flags |= 8;
0c4d3b5e
DM
3107 SAVEFREESV(sv);
3108
a0d63a7b
DM
3109 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3110 /* make sure our assumption about the size of the SAVEs are correct:
3111 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3112 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3113 }
e336de0d 3114
e788e7d3 3115 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3116 PUSHMARK(SP);
79072805 3117 PUSHs(sv);
8aad04aa
JH
3118#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3119 {
3120 struct sigaction oact;
3121
3122 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3123 if (sip) {
3124 HV *sih = newHV();
ad64d0ec 3125 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3126 /* The siginfo fields signo, code, errno, pid, uid,
3127 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3128 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3129 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3130#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
3131 hv_stores(sih, "errno", newSViv(sip->si_errno));
3132 hv_stores(sih, "status", newSViv(sip->si_status));
3133 hv_stores(sih, "uid", newSViv(sip->si_uid));
3134 hv_stores(sih, "pid", newSViv(sip->si_pid));
3135 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3136 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3137#endif
8aad04aa 3138 EXTEND(SP, 2);
ad64d0ec 3139 PUSHs(rv);
22f1178f 3140 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3141 }
b4552a27 3142
8aad04aa
JH
3143 }
3144 }
3145#endif
79072805 3146 PUTBACK;
a0d0e21e 3147
100c03aa
JL
3148 errsv_save = newSVsv(ERRSV);
3149
ad64d0ec 3150 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3151
d3acc0f7 3152 POPSTACK;
eed484f9
DD
3153 {
3154 SV * const errsv = ERRSV;
3155 if (SvTRUE_NN(errsv)) {
3156 SvREFCNT_dec(errsv_save);
c22d665b 3157#ifndef PERL_MICRO
1b266415
NIS
3158 /* Handler "died", for example to get out of a restart-able read().
3159 * Before we re-do that on its behalf re-enable the signal which was
3160 * blocked by the system when we entered.
3161 */
c22d665b 3162#ifdef HAS_SIGPROCMASK
d488af49 3163#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3164 if (sip || uap)
c22d665b 3165#endif
eed484f9
DD
3166 {
3167 sigset_t set;
3168 sigemptyset(&set);
3169 sigaddset(&set,sig);
3170 sigprocmask(SIG_UNBLOCK, &set, NULL);
3171 }
c22d665b 3172#else
eed484f9
DD
3173 /* Not clear if this will work */
3174 (void)rsignal(sig, SIG_IGN);
3175 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3176#endif
3177#endif /* !PERL_MICRO */
eed484f9
DD
3178 die_sv(errsv);
3179 }
3180 else {
3181 sv_setsv(errsv, errsv_save);
3182 SvREFCNT_dec(errsv_save);
3183 }
100c03aa
JL
3184 }
3185
00d579c5 3186cleanup:
0c4d3b5e
DM
3187 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3188 PL_savestack_ix = old_ss_ix;
72048cfe 3189 if (flags & 8)
2357bae7 3190 SvREFCNT_dec_NN(sv);
533c011a 3191 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3192
3280af22
NIS
3193 PL_Sv = tSv; /* Restore global temporaries. */
3194 PL_Xpv = tXpv;
53bb94e2 3195 return;
79072805 3196}
4e35701f
NIS
3197
3198
51371543 3199static void
8772537c 3200S_restore_magic(pTHX_ const void *p)
51371543 3201{
97aff369 3202 dVAR;
8772537c
AL
3203 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3204 SV* const sv = mgs->mgs_sv;
150b625d 3205 bool bumped;
51371543
GS
3206
3207 if (!sv)
3208 return;
3209
4bac9ae4
CS
3210 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3211 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
f8c7b90f 3212#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC
3213 /* While magic was saved (and off) sv_setsv may well have seen
3214 this SV as a prime candidate for COW. */
3215 if (SvIsCOW(sv))
e424a81e 3216 sv_force_normal_flags(sv, 0);
f9701176 3217#endif
f9c6fee5
CS
3218 if (mgs->mgs_readonly)
3219 SvREADONLY_on(sv);
3220 if (mgs->mgs_magical)
3221 SvFLAGS(sv) |= mgs->mgs_magical;
51371543
GS
3222 else
3223 mg_magical(sv);
51371543
GS
3224 }
3225
150b625d 3226 bumped = mgs->mgs_bumped;
51371543
GS
3227 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3228
3229 /* If we're still on top of the stack, pop us off. (That condition
3230 * will be satisfied if restore_magic was called explicitly, but *not*
3231 * if it's being called via leave_scope.)
3232 * The reason for doing this is that otherwise, things like sv_2cv()
3233 * may leave alloc gunk on the savestack, and some code
3234 * (e.g. sighandler) doesn't expect that...
3235 */
3236 if (PL_savestack_ix == mgs->mgs_ss_ix)
3237 {
1be36ce0
NC
3238 UV popval = SSPOPUV;
3239 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3240 PL_savestack_ix -= 2;
1be36ce0
NC
3241 popval = SSPOPUV;
3242 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3243 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3244 }
150b625d
DM
3245 if (bumped) {
3246 if (SvREFCNT(sv) == 1) {
3247 /* We hold the last reference to this SV, which implies that the
3248 SV was deleted as a side effect of the routines we called.
3249 So artificially keep it alive a bit longer.
3250 We avoid turning on the TEMP flag, which can cause the SV's
3251 buffer to get stolen (and maybe other stuff). */
150b625d 3252 sv_2mortal(sv);
4bac9ae4 3253 SvTEMP_off(sv);
8985fe98 3254 }
150b625d 3255 else
2357bae7 3256 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3257 }
51371543
GS
3258}
3259
0c4d3b5e
DM
3260/* clean up the mess created by Perl_sighandler().
3261 * Note that this is only called during an exit in a signal handler;
3262 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3263 * skipped over. */
0c4d3b5e 3264
51371543 3265static void
8772537c 3266S_unwind_handler_stack(pTHX_ const void *p)
51371543 3267{
27da23d5 3268 dVAR;
0c4d3b5e 3269 PERL_UNUSED_ARG(p);
7918f24d 3270
0c4d3b5e 3271 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3272}
1018e26f 3273
66610fdd 3274/*
b3ca2e83
NC
3275=for apidoc magic_sethint
3276
3277Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC
3278C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3279anything that would need a deep copy. Maybe we should warn if we find a
3280reference.
b3ca2e83
NC
3281
3282=cut
3283*/
3284int
3285Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3286{
3287 dVAR;
ad64d0ec 3288 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3289 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3290
7918f24d
NC
3291 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3292
e6e3e454
NC
3293 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3294 an alternative leaf in there, with PL_compiling.cop_hints being used if
3295 it's NULL. If needed for threads, the alternative could lock a mutex,
3296 or take other more complex action. */
3297
5b9c0671
NC
3298 /* Something changed in %^H, so it will need to be restored on scope exit.
3299 Doing this here saves a lot of doing it manually in perl code (and
3300 forgetting to do it, and consequent subtle errors. */
3301 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z
3302 CopHINTHASH_set(&PL_compiling,
3303 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC
3304 return 0;
3305}
3306
3307/*
f175cff5 3308=for apidoc magic_clearhint
b3ca2e83 3309
c28fe1ec
NC
3310Triggered by a delete from %^H, records the key to
3311C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC
3312
3313=cut
3314*/
3315int
3316Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3317{
3318 dVAR;
7918f24d
NC
3319
3320 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL
3321 PERL_UNUSED_ARG(sv);
3322
5b9c0671 3323 PL_hints |= HINT_LOCALIZE_HH;
20439bc7 3324 CopHINTHASH_set(&PL_compiling,
e3352591
FC
3325 mg->mg_len == HEf_SVKEY
3326 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3327 MUTABLE_SV(mg->mg_ptr), 0, 0)
3328 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3329 mg->mg_ptr, mg->mg_len, 0, 0));
b3ca2e83
NC
3330 return 0;
3331}
3332
3333/*
f747ebd6
Z
3334=for apidoc magic_clearhints
3335
3336Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3337
3338=cut
3339*/
3340int
3341Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3342{
3343 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3344 PERL_UNUSED_ARG(sv);
3345 PERL_UNUSED_ARG(mg);
20439bc7
Z
3346 cophh_free(CopHINTHASH_get(&PL_compiling));
3347 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
f747ebd6
Z
3348 return 0;
3349}
3350
09fb282d
FC
3351int
3352Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3353 const char *name, I32 namlen)
3354{
3355 MAGIC *nmg;
3356
3357 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
4f8dbb2d 3358 PERL_UNUSED_ARG(sv);
09fb282d
FC
3359 PERL_UNUSED_ARG(name);
3360 PERL_UNUSED_ARG(namlen);
3361
3362 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3363 nmg = mg_find(nsv, mg->mg_type);
3364 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3365 nmg->mg_ptr = mg->mg_ptr;
3366 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3367 nmg->mg_flags |= MGf_REFCOUNTED;
3368 return 1;
3369}
3370
f747ebd6 3371/*
66610fdd
RGS
3372 * Local variables:
3373 * c-indentation-style: bsd
3374 * c-basic-offset: 4
14d04a33 3375 * indent-tabs-mode: nil
66610fdd
RGS
3376 * End:
3377 *
14d04a33 3378 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3379 */