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store AV iterator as mg_len in more cases
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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"Magic" is special data attached to SV structures in order to give them
21"magical" properties. When any Perl code tries to read from, or assign to,
22an SV marked as magical, it calls the 'get' or 'set' function associated
154e47c8 23with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 24give it a chance to update its internal value (get on $. writes the line
b53c43bf 25number of the last read filehandle into the SV's IV slot), while
166f8a29 26set is called after an SV has been written to, in order to allow it to make
ddfa107c 27use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
28PL_rs global variable).
29
30Magic is implemented as a linked list of MAGIC structures attached to the
154e47c8 31SV. Each MAGIC struct holds the type of the magic, a pointer to an array
166f8a29 32of functions that implement the get(), set(), length() etc functions,
154e47c8 33plus space for some flags and pointers. For example, a tied variable has
166f8a29
DM
34a MAGIC structure that contains a pointer to the object associated with the
35tie.
36
7fefc6c1
KW
37=cut
38
ccfc67b7
JH
39*/
40
79072805 41#include "EXTERN.h"
864dbfa3 42#define PERL_IN_MG_C
79072805
LW
43#include "perl.h"
44
5cd24f17 45#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
46# ifdef I_GRP
47# include <grp.h>
48# endif
188ea221
CS
49#endif
50
757f63d8
SP
51#if defined(HAS_SETGROUPS)
52# ifndef NGROUPS
53# define NGROUPS 32
54# endif
55#endif
56
17aa7f3d
JH
57#ifdef __hpux
58# include <sys/pstat.h>
59#endif
60
7636ea95
AB
61#ifdef HAS_PRCTL_SET_NAME
62# include <sys/prctl.h>
63#endif
64
8aad04aa 65#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 66Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 67#else
e69880a5 68Signal_t Perl_csighandler(int sig);
8aad04aa 69#endif
e69880a5 70
9cffb111
OS
71#ifdef __Lynx__
72/* Missing protos on LynxOS */
73void setruid(uid_t id);
74void seteuid(uid_t id);
75void setrgid(uid_t id);
76void setegid(uid_t id);
77#endif
78
c07a80fd 79/*
4bac9ae4 80 * Pre-magic setup and post-magic takedown.
c07a80fd
PP
81 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
82 */
83
84struct magic_state {
85 SV* mgs_sv;
455ece5e 86 I32 mgs_ss_ix;
a623f893 87 U32 mgs_flags;
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{
455ece5e 95 MGS* mgs;
150b625d 96 bool bumped = FALSE;
7918f24d 97
ff44333e 98 PERL_ARGS_ASSERT_SAVE_MAGIC_FLAGS;
7918f24d 99
4bac9ae4
CS
100 assert(SvMAGICAL(sv));
101
150b625d
DM
102 /* we shouldn't really be called here with RC==0, but it can sometimes
103 * happen via mg_clear() (which also shouldn't be called when RC==0,
104 * but it can happen). Handle this case gracefully(ish) by not RC++
105 * and thus avoiding the resultant double free */
106 if (SvREFCNT(sv) > 0) {
107 /* guard against sv getting freed midway through the mg clearing,
108 * by holding a private reference for the duration. */
109 SvREFCNT_inc_simple_void_NN(sv);
110 bumped = TRUE;
111 }
8985fe98 112
8772537c 113 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
114
115 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd 116 mgs->mgs_sv = sv;
a623f893 117 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
455ece5e 118 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
150b625d 119 mgs->mgs_bumped = bumped;
c07a80fd 120
ff44333e 121 SvFLAGS(sv) &= ~flags;
3805b5fb 122 SvREADONLY_off(sv);
c07a80fd
PP
123}
124
ff44333e
FC
125#define save_magic(a,b) save_magic_flags(a,b,SVs_GMG|SVs_SMG|SVs_RMG)
126
954c1994
GS
127/*
128=for apidoc mg_magical
129
fbe13c60 130Turns on the magical status of an SV. See C<L</sv_magic>>.
954c1994
GS
131
132=cut
133*/
134
8990e307 135void
ddeaf645 136Perl_mg_magical(SV *sv)
8990e307 137{
e1ec3a88 138 const MAGIC* mg;
7918f24d 139 PERL_ARGS_ASSERT_MG_MAGICAL;
f9c6fee5
CS
140
141 SvMAGICAL_off(sv);
218787bd 142 if ((mg = SvMAGIC(sv))) {
218787bd
VP
143 do {
144 const MGVTBL* const vtbl = mg->mg_virtual;
145 if (vtbl) {
146 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
147 SvGMAGICAL_on(sv);
148 if (vtbl->svt_set)
149 SvSMAGICAL_on(sv);
150 if (vtbl->svt_clear)
151 SvRMAGICAL_on(sv);
152 }
153 } while ((mg = mg->mg_moremagic));
154 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
155 SvRMAGICAL_on(sv);
8990e307
LW
156 }
157}
158
954c1994
GS
159/*
160=for apidoc mg_get
161
4b1e7f06 162Do magic before a value is retrieved from the SV. The type of SV must
796b6530 163be >= C<SVt_PVMG>. See C<L</sv_magic>>.
954c1994
GS
164
165=cut
166*/
167
79072805 168int
864dbfa3 169Perl_mg_get(pTHX_ SV *sv)
79072805 170{
35a4481c 171 const I32 mgs_ix = SSNEW(sizeof(MGS));
a9844598 172 bool saved = FALSE;
f9c6fee5 173 bool have_new = 0;
b949b68f 174 bool taint_only = TRUE; /* the only get method seen is taint */
ff76feab 175 MAGIC *newmg, *head, *cur, *mg;
6683b158 176
7918f24d
NC
177 PERL_ARGS_ASSERT_MG_GET;
178
407287f9
FC
179 if (PL_localizing == 1 && sv == DEFSV) return 0;
180
ff76feab
AMS
181 /* We must call svt_get(sv, mg) for each valid entry in the linked
182 list of magic. svt_get() may delete the current entry, add new
183 magic to the head of the list, or upgrade the SV. AMS 20010810 */
184
185 newmg = cur = head = mg = SvMAGIC(sv);
186 while (mg) {
35a4481c 187 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 188 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 189
2b260de0 190 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS
191
192 /* taint's mg get is so dumb it doesn't need flag saving */
b949b68f
DM
193 if (mg->mg_type != PERL_MAGIC_taint) {
194 taint_only = FALSE;
195 if (!saved) {
196 save_magic(mgs_ix, sv);
197 saved = TRUE;
198 }
199 }
a9844598 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 205 if (!SvMAGIC(sv)) {
a623f893
FC
206 /* recalculate flags */
207 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
58f82c5c 208 break;
f9c6fee5 209 }
b77f7d40 210
f9c6fee5 211 /* recalculate flags if this entry was deleted. */
ff76feab 212 if (mg->mg_flags & MGf_GSKIP)
a623f893
FC
213 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
214 ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 215 }
7d1328bb 216 else if (vtbl == &PL_vtbl_utf8) {
b949b68f
DM
217 /* get-magic can reallocate the PV, unless there's only taint
218 * magic */
219 if (taint_only) {
220 MAGIC *mg2;
221 for (mg2 = nextmg; mg2; mg2 = mg2->mg_moremagic) {
222 if ( mg2->mg_type != PERL_MAGIC_taint
223 && !(mg2->mg_flags & MGf_GSKIP)
224 && mg2->mg_virtual
225 && mg2->mg_virtual->svt_get
226 ) {
227 taint_only = FALSE;
228 break;
229 }
230 }
231 }
232 if (!taint_only)
233 magic_setutf8(sv, mg);
7d1328bb 234 }
ff76feab 235
f9c6fee5 236 mg = nextmg;
ff76feab 237
0723351e 238 if (have_new) {
ff76feab
AMS
239 /* Have we finished with the new entries we saw? Start again
240 where we left off (unless there are more new entries). */
241 if (mg == head) {
0723351e 242 have_new = 0;
ff76feab
AMS
243 mg = cur;
244 head = newmg;
245 }
246 }
247
248 /* Were any new entries added? */
0723351e
NC
249 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
250 have_new = 1;
ff76feab
AMS
251 cur = mg;
252 mg = newmg;
a623f893
FC
253 /* recalculate flags */
254 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
760ac839 255 }
79072805 256 }
463ee0b2 257
a9844598
CS
258 if (saved)
259 restore_magic(INT2PTR(void *, (IV)mgs_ix));
260
79072805
LW
261 return 0;
262}
263
954c1994
GS
264/*
265=for apidoc mg_set
266
fbe13c60 267Do magic after a value is assigned to the SV. See C<L</sv_magic>>.
954c1994
GS
268
269=cut
270*/
271
79072805 272int
864dbfa3 273Perl_mg_set(pTHX_ SV *sv)
79072805 274{
35a4481c 275 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 276 MAGIC* mg;
463ee0b2
LW
277 MAGIC* nextmg;
278
7918f24d
NC
279 PERL_ARGS_ASSERT_MG_SET;
280
b5ed8c44
FC
281 if (PL_localizing == 2 && sv == DEFSV) return 0;
282
ff44333e 283 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW
284
285 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 286 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 287 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
288 if (mg->mg_flags & MGf_GSKIP) {
289 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
a623f893 290 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 291 }
e0a73de4 292 if (PL_localizing == 2
b5ed8c44 293 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 294 continue;
2b260de0 295 if (vtbl && vtbl->svt_set)
16c91539 296 vtbl->svt_set(aTHX_ sv, mg);
79072805 297 }
463ee0b2 298
8772537c 299 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
300 return 0;
301}
302
954c1994
GS
303/*
304=for apidoc mg_length
305
d4e99c76 306Reports on the SV's length in bytes, calling length magic if available,
796b6530 307but does not set the UTF8 flag on C<sv>. It will fall back to 'get'
bd8446cf 308magic if there is no 'length' magic, but with no indication as to
796b6530
KW
309whether it called 'get' magic. It assumes C<sv> is a C<PVMG> or
310higher. Use C<sv_len()> instead.
954c1994
GS
311
312=cut
313*/
314
79072805 315U32
864dbfa3 316Perl_mg_length(pTHX_ SV *sv)
79072805
LW
317{
318 MAGIC* mg;
463ee0b2 319 STRLEN len;
463ee0b2 320
7918f24d
NC
321 PERL_ARGS_ASSERT_MG_LENGTH;
322
79072805 323 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 324 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 325 if (vtbl && vtbl->svt_len) {
35a4481c 326 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 327 save_magic(mgs_ix, sv);
a0d0e21e 328 /* omit MGf_GSKIP -- not changed here */
16c91539 329 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 330 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
331 return len;
332 }
333 }
334
bd8446cf 335 (void)SvPV_const(sv, len);
463ee0b2 336 return len;
79072805
LW
337}
338
8fb26106 339I32
864dbfa3 340Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
341{
342 MAGIC* mg;
ac27b0f5 343
7918f24d
NC
344 PERL_ARGS_ASSERT_MG_SIZE;
345
93965878 346 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 347 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 348 if (vtbl && vtbl->svt_len) {
35a4481c
AL
349 const I32 mgs_ix = SSNEW(sizeof(MGS));
350 I32 len;
455ece5e 351 save_magic(mgs_ix, sv);
93965878 352 /* omit MGf_GSKIP -- not changed here */
16c91539 353 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 354 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
355 return len;
356 }
357 }
358
359 switch(SvTYPE(sv)) {
360 case SVt_PVAV:
502c6561 361 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
362 case SVt_PVHV:
363 /* FIXME */
364 default:
cea2e8a9 365 Perl_croak(aTHX_ "Size magic not implemented");
81d52ecd 366
93965878 367 }
a25b5927 368 NOT_REACHED; /* NOTREACHED */
93965878
NIS
369}
370
954c1994
GS
371/*
372=for apidoc mg_clear
373
fbe13c60 374Clear something magical that the SV represents. See C<L</sv_magic>>.
954c1994
GS
375
376=cut
377*/
378
79072805 379int
864dbfa3 380Perl_mg_clear(pTHX_ SV *sv)
79072805 381{
35a4481c 382 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 383 MAGIC* mg;
8ac77ac9 384 MAGIC *nextmg;
463ee0b2 385
7918f24d
NC
386 PERL_ARGS_ASSERT_MG_CLEAR;
387
455ece5e 388 save_magic(mgs_ix, sv);
463ee0b2 389
8ac77ac9 390 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 391 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 392 /* omit GSKIP -- never set here */
727405f8 393
8ac77ac9
NC
394 nextmg = mg->mg_moremagic; /* it may delete itself */
395
2b260de0 396 if (vtbl && vtbl->svt_clear)
16c91539 397 vtbl->svt_clear(aTHX_ sv, mg);
79072805 398 }
463ee0b2 399
8772537c 400 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
401 return 0;
402}
403
ed624ca8 404static MAGIC*
ddeaf645 405S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
39de7f53 406{
39de7f53
FR
407 assert(flags <= 1);
408
409 if (sv) {
410 MAGIC *mg;
411
412 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
413 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
414 return mg;
415 }
416 }
417 }
418
419 return NULL;
420}
421
954c1994
GS
422/*
423=for apidoc mg_find
424
796b6530 425Finds the magic pointer for C<type> matching the SV. See C<L</sv_magic>>.
954c1994
GS
426
427=cut
428*/
429
93a17b20 430MAGIC*
ddeaf645 431Perl_mg_find(const SV *sv, int type)
93a17b20 432{
ddeaf645 433 return S_mg_findext_flags(sv, type, NULL, 0);
39de7f53
FR
434}
435
436/*
437=for apidoc mg_findext
438
439Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
fbe13c60 440C<L</sv_magicext>>.
39de7f53
FR
441
442=cut
443*/
444
445MAGIC*
ddeaf645 446Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
39de7f53 447{
ddeaf645 448 return S_mg_findext_flags(sv, type, vtbl, 1);
93a17b20
LW
449}
450
96c2a8ff
FC
451MAGIC *
452Perl_mg_find_mglob(pTHX_ SV *sv)
453{
454 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
455 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
456 /* This sv is only a delegate. //g magic must be attached to
457 its target. */
458 vivify_defelem(sv);
459 sv = LvTARG(sv);
460 }
461 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
ddeaf645 462 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
96c2a8ff
FC
463 return NULL;
464}
465
954c1994
GS
466/*
467=for apidoc mg_copy
468
fbe13c60 469Copies the magic from one SV to another. See C<L</sv_magic>>.
954c1994
GS
470
471=cut
472*/
473
79072805 474int
864dbfa3 475Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 476{
463ee0b2 477 int count = 0;
79072805 478 MAGIC* mg;
7918f24d
NC
479
480 PERL_ARGS_ASSERT_MG_COPY;
481
463ee0b2 482 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 483 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 484 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 485 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 486 }
823a54a3
AL
487 else {
488 const char type = mg->mg_type;
1e73acc8 489 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
490 sv_magic(nsv,
491 (type == PERL_MAGIC_tied)
492 ? SvTIED_obj(sv, mg)
27deb0cf 493 : mg->mg_obj,
823a54a3
AL
494 toLOWER(type), key, klen);
495 count++;
496 }
79072805 497 }
79072805 498 }
463ee0b2 499 return count;
79072805
LW
500}
501
954c1994 502/*
0cbee0a4
DM
503=for apidoc mg_localize
504
9711599e 505Copy some of the magic from an existing SV to new localized version of that
dfcfced8
KW
506SV. Container magic (I<e.g.>, C<%ENV>, C<$1>, C<tie>)
507gets copied, value magic doesn't (I<e.g.>,
796b6530 508C<taint>, C<pos>).
9711599e 509
796b6530 510If C<setmagic> is false then no set magic will be called on the new (empty) SV.
61b16eb9 511This typically means that assignment will soon follow (e.g. S<C<'local $x = $y'>>),
9711599e 512and that will handle the magic.
0cbee0a4
DM
513
514=cut
515*/
516
517void
af7df257 518Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4
DM
519{
520 MAGIC *mg;
7918f24d
NC
521
522 PERL_ARGS_ASSERT_MG_LOCALIZE;
523
658a9f31
JD
524 if (nsv == DEFSV)
525 return;
526
0cbee0a4 527 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 528 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 529 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 530 continue;
0cbee0a4 531
a5063e7c 532 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 533 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 534 else
0cbee0a4
DM
535 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
536 mg->mg_ptr, mg->mg_len);
a5063e7c 537
0cbee0a4 538 /* container types should remain read-only across localization */
9ff3e6d8 539 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM
540 }
541
542 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
543 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 544 if (setmagic) {
9711599e
CS
545 PL_localizing = 1;
546 SvSETMAGIC(nsv);
547 PL_localizing = 0;
548 }
0cbee0a4
DM
549 }
550}
551
d9088386
Z
552#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
553static void
554S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
555{
556 const MGVTBL* const vtbl = mg->mg_virtual;
557 if (vtbl && vtbl->svt_free)
558 vtbl->svt_free(aTHX_ sv, mg);
559 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
560 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
561 Safefree(mg->mg_ptr);
562 else if (mg->mg_len == HEf_SVKEY)
563 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
564 }
565 if (mg->mg_flags & MGf_REFCOUNTED)
566 SvREFCNT_dec(mg->mg_obj);
567 Safefree(mg);
568}
569
0cbee0a4 570/*
954c1994
GS
571=for apidoc mg_free
572
fbe13c60 573Free any magic storage used by the SV. See C<L</sv_magic>>.
954c1994
GS
574
575=cut
576*/
577
79072805 578int
864dbfa3 579Perl_mg_free(pTHX_ SV *sv)
79072805
LW
580{
581 MAGIC* mg;
582 MAGIC* moremagic;
7918f24d
NC
583
584 PERL_ARGS_ASSERT_MG_FREE;
585
79072805 586 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 587 moremagic = mg->mg_moremagic;
d9088386 588 mg_free_struct(sv, mg);
c826f41b 589 SvMAGIC_set(sv, moremagic);
79072805 590 }
b162af07 591 SvMAGIC_set(sv, NULL);
68f8932e 592 SvMAGICAL_off(sv);
79072805
LW
593 return 0;
594}
595
d9088386
Z
596/*
597=for apidoc Am|void|mg_free_type|SV *sv|int how
598
2d7f6611 599Remove any magic of type C<how> from the SV C<sv>. See L</sv_magic>.
d9088386
Z
600
601=cut
602*/
603
604void
605Perl_mg_free_type(pTHX_ SV *sv, int how)
606{
607 MAGIC *mg, *prevmg, *moremg;
608 PERL_ARGS_ASSERT_MG_FREE_TYPE;
609 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
d9088386
Z
610 moremg = mg->mg_moremagic;
611 if (mg->mg_type == how) {
19742f39 612 MAGIC *newhead;
d9088386
Z
613 /* temporarily move to the head of the magic chain, in case
614 custom free code relies on this historical aspect of mg_free */
615 if (prevmg) {
616 prevmg->mg_moremagic = moremg;
617 mg->mg_moremagic = SvMAGIC(sv);
618 SvMAGIC_set(sv, mg);
619 }
620 newhead = mg->mg_moremagic;
621 mg_free_struct(sv, mg);
622 SvMAGIC_set(sv, newhead);
623 mg = prevmg;
624 }
625 }
626 mg_magical(sv);
627}
628
e0d4aead
TC
629/*
630=for apidoc mg_freeext
631
632Remove any magic of type C<how> using virtual table C<vtbl> from the
633SV C<sv>. See L</sv_magic>.
634
635C<mg_freeext(sv, how, NULL)> is equivalent to C<mg_free_type(sv, how)>.
636
637=cut
638*/
639
640void
641Perl_mg_freeext(pTHX_ SV *sv, int how, const MGVTBL *vtbl)
642{
643 MAGIC *mg, *prevmg, *moremg;
644 PERL_ARGS_ASSERT_MG_FREEEXT;
645 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
646 MAGIC *newhead;
647 moremg = mg->mg_moremagic;
648 if (mg->mg_type == how && (vtbl == NULL || mg->mg_virtual == vtbl)) {
649 /* temporarily move to the head of the magic chain, in case
650 custom free code relies on this historical aspect of mg_free */
651 if (prevmg) {
652 prevmg->mg_moremagic = moremg;
653 mg->mg_moremagic = SvMAGIC(sv);
654 SvMAGIC_set(sv, mg);
655 }
656 newhead = mg->mg_moremagic;
657 mg_free_struct(sv, mg);
658 SvMAGIC_set(sv, newhead);
659 mg = prevmg;
660 }
661 }
662 mg_magical(sv);
663}
664
79072805 665#include <signal.h>
79072805 666
942e002e 667U32
864dbfa3 668Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 669{
8772537c 670 PERL_UNUSED_ARG(sv);
6cef1e77 671
7918f24d
NC
672 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
673
0bd48802 674 if (PL_curpm) {
27deb0cf 675 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 676 if (rx) {
fa531f32
DM
677 const SSize_t n = (SSize_t)mg->mg_obj;
678 if (n == '+') { /* @+ */
a678b0e4 679 /* return the number possible */
07bc277f 680 return RX_NPARENS(rx);
27deb0cf 681 } else { /* @- @^CAPTURE @{^CAPTURE} */
07bc277f 682 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
683
684 /* return the last filled */
f46c4081 685 while ( paren >= 0
07bc277f
NC
686 && (RX_OFFS(rx)[paren].start == -1
687 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 688 paren--;
fa531f32 689 if (n == '-') {
27deb0cf
YO
690 /* @- */
691 return (U32)paren;
692 } else {
693 /* @^CAPTURE @{^CAPTURE} */
694 return paren >= 0 ? (U32)(paren-1) : (U32)-1;
695 }
696 }
0bd48802 697 }
8f580fb8 698 }
ac27b0f5 699
942e002e 700 return (U32)-1;
6cef1e77
IZ
701}
702
6502e081
DM
703/* @-, @+ */
704
6cef1e77 705int
864dbfa3 706Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 707{
7918f24d
NC
708 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
709
0bd48802 710 if (PL_curpm) {
27deb0cf 711 REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 712 if (rx) {
fa531f32 713 const SSize_t n = (SSize_t)mg->mg_obj;
27deb0cf
YO
714 /* @{^CAPTURE} does not contain $&, so we need to increment by 1 */
715 const I32 paren = mg->mg_len
fa531f32 716 + (n == '\003' ? 1 : 0);
a10eae29
FC
717 SSize_t s;
718 SSize_t t;
0bd48802
AL
719 if (paren < 0)
720 return 0;
07bc277f
NC
721 if (paren <= (I32)RX_NPARENS(rx) &&
722 (s = RX_OFFS(rx)[paren].start) != -1 &&
723 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 724 {
a10eae29 725 SSize_t i;
27deb0cf 726
fa531f32 727 if (n == '+') /* @+ */
0bd48802 728 i = t;
fa531f32 729 else if (n == '-') /* @- */
0bd48802 730 i = s;
27deb0cf
YO
731 else { /* @^CAPTURE @{^CAPTURE} */
732 CALLREG_NUMBUF_FETCH(rx,paren,sv);
733 return 0;
734 }
0bd48802 735
a10eae29 736 if (RX_MATCH_UTF8(rx)) {
07bc277f 737 const char * const b = RX_SUBBEG(rx);
0bd48802 738 if (b)
6502e081
DM
739 i = RX_SUBCOFFSET(rx) +
740 utf8_length((U8*)b,
741 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 742 }
727405f8 743
a10eae29 744 sv_setuv(sv, i);
232af1f8 745 return 0;
1aa99e6b 746 }
0bd48802 747 }
6cef1e77 748 }
3773545d 749 sv_set_undef(sv);
6cef1e77
IZ
750 return 0;
751}
752
6502e081
DM
753/* @-, @+ */
754
e4b89193 755int
a29d06ed
MG
756Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
757{
7918f24d 758 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
dc3bf405 759 PERL_UNUSED_CONTEXT;
d4c19fe8
AL
760 PERL_UNUSED_ARG(sv);
761 PERL_UNUSED_ARG(mg);
cb077ed2 762 Perl_croak_no_modify();
0dbb1585 763 NORETURN_FUNCTION_END;
a29d06ed
MG
764}
765
ad3296c6 766#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
767 if (SvPOK(sv)) { \
768 STRLEN len = SvCUR(sv); \
769 char * const p = SvPVX(sv); \
8e6b4db6
PC
770 while (len > 0 && isSPACE(p[len-1])) \
771 --len; \
772 SvCUR_set(sv, len); \
773 p[len] = '\0'; \
774 } \
ad3296c6
SH
775} STMT_END
776
8b850bd5
NC
777void
778Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
779{
7918f24d
NC
780 PERL_ARGS_ASSERT_EMULATE_COP_IO;
781
8b850bd5 782 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
e03e82a0 783 sv_set_undef(sv);
8b850bd5 784 else {
b2aed775 785 SvPVCLEAR(sv);
8b850bd5
NC
786 SvUTF8_off(sv);
787 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 788 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC
789 assert(value);
790 sv_catsv(sv, value);
791 }
792 sv_catpvs(sv, "\0");
793 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 794 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC
795 assert(value);
796 sv_catsv(sv, value);
797 }
798 }
799}
800
d9fe7d23
KW
801STATIC void
802S_fixup_errno_string(pTHX_ SV* sv)
803{
804 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
805 * Perl space. */
806
807 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
808
809 assert(SvOK(sv));
b35e4f8b
KW
810
811 if(strEQ(SvPVX(sv), "")) {
812 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
813 }
814 else {
d9fe7d23 815
d3c0b317
KW
816 /* In some locales the error string may come back as UTF-8, in which
817 * case we should turn on that flag. This didn't use to happen, and to
5320b60d
KW
818 * avoid as many possible backward compatibility issues as possible, we
819 * don't turn on the flag unless we have to. So the flag stays off for
9f10db87
KW
820 * an entirely invariant string. We assume that if the string looks
821 * like UTF-8, it really is UTF-8: "text in any other encoding that
822 * uses bytes with the high bit set is extremely unlikely to pass a
823 * UTF-8 validity test"
824 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
825 * potential that we will get it wrong however, especially on short
a8f4b0c6
KW
826 * error message text, so do an additional check. */
827 if ( ! IN_BYTES /* respect 'use bytes' */
c5f058df 828 && ! is_utf8_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
a8f4b0c6
KW
829 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv))
830
831#ifdef USE_LOCALE_MESSAGES
832
833 && _is_cur_LC_category_utf8(LC_MESSAGES)
834
835#elif defined(USE_LOCLAE_CTYPE)
836
837 /* For systems that don't have a separate message category,
838 * this assumes that they follow the CTYPE one */
839 && _is_cur_LC_category_utf8(LC_CTYPE)
840
841#endif
842
843 ) {
d3c0b317
KW
844 SvUTF8_on(sv);
845 }
b35e4f8b 846 }
d9fe7d23
KW
847}
848
658db622
Z
849/*
850=for apidoc Am|SV *|sv_string_from_errnum|int errnum|SV *tgtsv
851
852Generates the message string describing an OS error and returns it as
853an SV. C<errnum> must be a value that C<errno> could take, identifying
854the type of error.
855
856If C<tgtsv> is non-null then the string will be written into that SV
857(overwriting existing content) and it will be returned. If C<tgtsv>
858is a null pointer then the string will be written into a new mortal SV
859which will be returned.
860
861The message will be taken from whatever locale would be used by C<$!>,
862and will be encoded in the SV in whatever manner would be used by C<$!>.
863The details of this process are subject to future change. Currently,
864the message is taken from the C locale by default (usually producing an
865English message), and from the currently selected locale when in the scope
866of the C<use locale> pragma. A heuristic attempt is made to decode the
867message from the locale's character encoding, but it will only be decoded
868as either UTF-8 or ISO-8859-1. It is always correctly decoded in a UTF-8
869locale, usually in an ISO-8859-1 locale, and never in any other locale.
870
871The SV is always returned containing an actual string, and with no other
872OK bits set. Unlike C<$!>, a message is even yielded for C<errnum> zero
873(meaning success), and if no useful message is available then a useless
874string (currently empty) is returned.
875
876=cut
877*/
878
879SV *
880Perl_sv_string_from_errnum(pTHX_ int errnum, SV *tgtsv)
881{
882 char const *errstr;
883 if(!tgtsv)
884 tgtsv = sv_newmortal();
885 errstr = my_strerror(errnum);
886 if(errstr) {
887 sv_setpv(tgtsv, errstr);
888 fixup_errno_string(tgtsv);
889 } else {
890 SvPVCLEAR(tgtsv);
891 }
892 return tgtsv;
893}
894
25bbd826
CB
895#ifdef VMS
896#include <descrip.h>
897#include <starlet.h>
898#endif
899
79072805 900int
864dbfa3 901Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 902{
eb578fdb
KW
903 I32 paren;
904 const char *s = NULL;
905 REGEXP *rx;
823a54a3 906 const char * const remaining = mg->mg_ptr + 1;
e91d8259 907 char nextchar;
79072805 908
7918f24d
NC
909 PERL_ARGS_ASSERT_MAGIC_GET;
910
e91d8259 911 if (!mg->mg_ptr) {
e91d8259 912 paren = mg->mg_len;
e91d8259 913 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 914 do_numbuf_fetch:
e91d8259 915 CALLREG_NUMBUF_FETCH(rx,paren,sv);
e91d8259 916 }
e03e82a0
DM
917 else
918 goto set_undef;
e91d8259
NC
919 return 0;
920 }
921
922 nextchar = *remaining;
79072805 923 switch (*mg->mg_ptr) {
748a9306 924 case '\001': /* ^A */
f2da823f 925 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
e03e82a0
DM
926 else
927 sv_set_undef(sv);
125b9982
NT
928 if (SvTAINTED(PL_bodytarget))
929 SvTAINTED_on(sv);
748a9306 930 break;
e5218da5 931 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 932 if (nextchar == '\0') {
e5218da5
GA
933 sv_setiv(sv, (IV)PL_minus_c);
934 }
823a54a3 935 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
936 sv_setiv(sv, (IV)STATUS_NATIVE);
937 }
49460fe6
NIS
938 break;
939
79072805 940 case '\004': /* ^D */
aea4f609 941 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 942 break;
28f23441 943 case '\005': /* ^E */
6c6eab55
KW
944 if (nextchar != '\0') {
945 if (strEQ(remaining, "NCODING"))
3773545d 946 sv_set_undef(sv);
4f4ff3a7 947 break;
6c6eab55 948 }
4f4ff3a7
KW
949
950#if defined(VMS) || defined(OS2) || defined(WIN32)
951# if defined(VMS)
2a99ff86
KW
952 {
953 char msg[255];
954 $DESCRIPTOR(msgdsc,msg);
955 sv_setnv(sv,(NV) vaxc$errno);
956 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
957 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
958 else
b2aed775 959 SvPVCLEAR(sv);
2a99ff86 960 }
4b645107 961#elif defined(OS2)
2a99ff86
KW
962 if (!(_emx_env & 0x200)) { /* Under DOS */
963 sv_setnv(sv, (NV)errno);
2c6ee1a7 964 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW
965 } else {
966 if (errno != errno_isOS2) {
967 const int tmp = _syserrno();
968 if (tmp) /* 2nd call to _syserrno() makes it 0 */
969 Perl_rc = tmp;
970 }
971 sv_setnv(sv, (NV)Perl_rc);
972 sv_setpv(sv, os2error(Perl_rc));
973 }
1534c6f5 974 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW
975 fixup_errno_string(sv);
976 }
4f4ff3a7 977# elif defined(WIN32)
2a99ff86
KW
978 {
979 const DWORD dwErr = GetLastError();
980 sv_setnv(sv, (NV)dwErr);
981 if (dwErr) {
982 PerlProc_GetOSError(sv, dwErr);
2efab60d 983 fixup_errno_string(sv);
2a99ff86
KW
984 }
985 else
b2aed775 986 SvPVCLEAR(sv);
2a99ff86
KW
987 SetLastError(dwErr);
988 }
4f4ff3a7
KW
989# else
990# error Missing code for platform
991# endif
2a99ff86
KW
992 SvRTRIM(sv);
993 SvNOK_on(sv); /* what a wonderful hack! */
994 break;
4f4ff3a7
KW
995#endif /* End of platforms with special handling for $^E; others just fall
996 through to $! */
2165bd23 997 /* FALLTHROUGH */
46f3e16c
KW
998
999 case '!':
1000 {
5f1b979d 1001 dSAVE_ERRNO;
46f3e16c 1002#ifdef VMS
5f1b979d 1003 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 1004#else
5f1b979d 1005 sv_setnv(sv, (NV)errno);
46f3e16c
KW
1006#endif
1007#ifdef OS2
5f1b979d
KW
1008 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1009 sv_setpv(sv, os2error(Perl_rc));
1010 else
46f3e16c 1011#endif
5f1b979d 1012 if (! errno) {
b2aed775 1013 SvPVCLEAR(sv);
46f3e16c 1014 }
5f1b979d 1015 else {
658db622
Z
1016 sv_string_from_errnum(errno, sv);
1017 /* If no useful string is available, don't
1018 * claim to have a string part. The SvNOK_on()
5f1b979d 1019 * below will cause just the number part to be valid */
658db622
Z
1020 if (!SvCUR(sv))
1021 SvPOK_off(sv);
5f1b979d
KW
1022 }
1023 RESTORE_ERRNO;
46f3e16c
KW
1024 }
1025
1026 SvRTRIM(sv);
1027 SvNOK_on(sv); /* what a wonderful hack! */
1028 break;
1029
79072805 1030 case '\006': /* ^F */
3280af22 1031 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 1032 break;
9ebf26ad
FR
1033 case '\007': /* ^GLOBAL_PHASE */
1034 if (strEQ(remaining, "LOBAL_PHASE")) {
1035 sv_setpvn(sv, PL_phase_names[PL_phase],
1036 strlen(PL_phase_names[PL_phase]));
1037 }
1038 break;
a0d0e21e 1039 case '\010': /* ^H */
5d382c25 1040 sv_setuv(sv, PL_hints);
a0d0e21e 1041 break;
9d116dd7 1042 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 1043 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 1044 break;
8561ea1d
FC
1045 case '\014': /* ^LAST_FH */
1046 if (strEQ(remaining, "AST_FH")) {
745e740c 1047 if (PL_last_in_gv && (SV*)PL_last_in_gv != &PL_sv_undef) {
8561ea1d
FC
1048 assert(isGV_with_GP(PL_last_in_gv));
1049 SV_CHECK_THINKFIRST_COW_DROP(sv);
1050 prepare_SV_for_RV(sv);
1051 SvOK_off(sv);
1052 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
1053 SvROK_on(sv);
1054 sv_rvweaken(sv);
1055 }
3773545d
DM
1056 else
1057 sv_set_undef(sv);
8561ea1d
FC
1058 }
1059 break;
ac27b0f5 1060 case '\017': /* ^O & ^OPEN */
823a54a3 1061 if (nextchar == '\0') {
ac27b0f5 1062 sv_setpv(sv, PL_osname);
3511154c
DM
1063 SvTAINTED_off(sv);
1064 }
823a54a3 1065 else if (strEQ(remaining, "PEN")) {
8b850bd5 1066 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 1067 }
28f23441 1068 break;
9ebf26ad 1069 case '\020':
a6d0b1b5 1070 sv_setiv(sv, (IV)PL_perldb);
79072805 1071 break;
fb73857a 1072 case '\023': /* ^S */
a6d0b1b5 1073 {
bc177e6b 1074 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 1075 SvOK_off(sv);
3280af22 1076 else if (PL_in_eval)
6dc8a9e4 1077 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
1078 else
1079 sv_setiv(sv, 0);
d58bf5aa 1080 }
fb73857a 1081 break;
79072805 1082 case '\024': /* ^T */
823a54a3 1083 if (nextchar == '\0') {
88e89b8a 1084#ifdef BIG_TIME
7c36658b 1085 sv_setnv(sv, PL_basetime);
88e89b8a 1086#else
7c36658b 1087 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 1088#endif
7c36658b 1089 }
823a54a3 1090 else if (strEQ(remaining, "AINT"))
284167a5
SM
1091 sv_setiv(sv, TAINTING_get
1092 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 1093 : 0);
7c36658b 1094 break;
e07ea26a 1095 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1096 if (strEQ(remaining, "NICODE"))
a05d7ebb 1097 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1098 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1099 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
1100 else if (strEQ(remaining, "TF8CACHE"))
1101 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
1102 break;
1103 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1104 if (nextchar == '\0')
8298454c 1105 sv_setiv(sv, (IV)cBOOL(PL_dowarn & G_WARN_ON));
823a54a3 1106 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1107 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1108 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
1109 }
1110 else if (PL_compiling.cop_warnings == pWARN_STD) {
e03e82a0 1111 goto set_undef;
013b78e8 1112 }
d3a7d8c7 1113 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
1114 /* Get the bit mask for $warnings::Bits{all}, because
1115 * it could have been extended by warnings::register */
4bac9ae4
CS
1116 HV * const bits = get_hv("warnings::Bits", 0);
1117 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1118 if (bits_all)
1119 sv_copypv(sv, *bits_all);
1120 else
1121 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1122 }
4438c4b7 1123 else {
72dc9ed5
NC
1124 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1125 *PL_compiling.cop_warnings);
ac27b0f5 1126 }
4438c4b7 1127 }
8ca2a5d6
DD
1128#ifdef WIN32
1129 else if (strEQ(remaining, "IN32_SLOPPY_STAT")) {
1130 sv_setiv(sv, w32_sloppystat);
1131 }
1132#endif
79072805 1133 break;
79072805 1134 case '+':
aaa362c4 1135 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1136 paren = RX_LASTPAREN(rx);
1137 if (paren)
1138 goto do_numbuf_fetch;
79072805 1139 }
e03e82a0 1140 goto set_undef;
a01268b5
JH
1141 case '\016': /* ^N */
1142 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM
1143 paren = RX_LASTCLOSEPAREN(rx);
1144 if (paren)
1145 goto do_numbuf_fetch;
a01268b5 1146 }
e03e82a0 1147 goto set_undef;
79072805 1148 case '.':
3280af22 1149 if (GvIO(PL_last_in_gv)) {
357c8808 1150 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1151 }
79072805
LW
1152 break;
1153 case '?':
809a5acc 1154 {
809a5acc 1155 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1156#ifdef COMPLEX_STATUS
41cb7b2b 1157 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
1158 LvTARGOFF(sv) = PL_statusvalue;
1159 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1160#endif
809a5acc 1161 }
79072805
LW
1162 break;
1163 case '^':
acbe1b9d 1164 if (GvIOp(PL_defoutgv))
099be4f1 1165 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
1166 if (s)
1167 sv_setpv(sv,s);
1168 else {
3280af22 1169 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1170 sv_catpvs(sv,"_TOP");
79072805
LW
1171 }
1172 break;
1173 case '~':
acbe1b9d 1174 if (GvIOp(PL_defoutgv))
0daa599b 1175 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1176 if (!s)
3280af22 1177 s = GvENAME(PL_defoutgv);
79072805
LW
1178 sv_setpv(sv,s);
1179 break;
79072805 1180 case '=':
099be4f1 1181 if (GvIO(PL_defoutgv))
0daa599b 1182 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1183 break;
1184 case '-':
099be4f1 1185 if (GvIO(PL_defoutgv))
0daa599b 1186 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1187 break;
1188 case '%':
099be4f1 1189 if (GvIO(PL_defoutgv))
0daa599b 1190 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1191 break;
79072805 1192 case ':':
79072805
LW
1193 case '/':
1194 break;
1195 case '[':
e1dccc0d 1196 sv_setiv(sv, 0);
79072805
LW
1197 break;
1198 case '|':
099be4f1 1199 if (GvIO(PL_defoutgv))
0daa599b 1200 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1201 break;
79072805 1202 case '\\':
b2ce0fda 1203 if (PL_ors_sv)
f28098ff 1204 sv_copypv(sv, PL_ors_sv);
4bac9ae4 1205 else
e03e82a0 1206 goto set_undef;
79072805 1207 break;
0e219455 1208 case '$': /* $$ */
9cdac2a2
FC
1209 {
1210 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1211 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC
1212 /* never set manually, or at least not since last fork */
1213 sv_setiv(sv, pid);
19db9fb7
Z
1214 /* never unsafe, even if reading in a tainted expression */
1215 SvTAINTED_off(sv);
1216 }
9cdac2a2
FC
1217 /* else a value has been assigned manually, so do nothing */
1218 }
0e219455 1219 break;
79072805 1220 case '<':
dfff4baf 1221 sv_setuid(sv, PerlProc_getuid());
79072805
LW
1222 break;
1223 case '>':
dfff4baf 1224 sv_setuid(sv, PerlProc_geteuid());
79072805
LW
1225 break;
1226 case '(':
dfff4baf 1227 sv_setgid(sv, PerlProc_getgid());
79072805
LW
1228 goto add_groups;
1229 case ')':
dfff4baf 1230 sv_setgid(sv, PerlProc_getegid());
79072805 1231 add_groups:
79072805 1232#ifdef HAS_GETGROUPS
79072805 1233 {
57d7c65e 1234 Groups_t *gary = NULL;
375ed12a
JH
1235 I32 num_groups = getgroups(0, gary);
1236 if (num_groups > 0) {
19742f39 1237 I32 i;
375ed12a
JH
1238 Newx(gary, num_groups, Groups_t);
1239 num_groups = getgroups(num_groups, gary);
1240 for (i = 0; i < num_groups; i++)
147e3846 1241 Perl_sv_catpvf(aTHX_ sv, " %" IVdf, (IV)gary[i]);
375ed12a
JH
1242 Safefree(gary);
1243 }
79072805 1244 }
155aba94 1245 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1246#endif
79072805 1247 break;
79072805
LW
1248 case '0':
1249 break;
1250 }
a0d0e21e 1251 return 0;
e03e82a0
DM
1252
1253 set_undef:
1254 sv_set_undef(sv);
1255 return 0;
79072805
LW
1256}
1257
1258int
864dbfa3 1259Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1260{
8772537c 1261 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1262
7918f24d
NC
1263 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1264
79072805 1265 if (uf && uf->uf_val)
24f81a43 1266 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1267 return 0;
1268}
1269
1270int
864dbfa3 1271Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1272{
9ae3433d 1273 STRLEN len = 0, klen;
12033064 1274 const char * const key = MgPV_const(mg,klen);
888a67f6 1275 const char *s = "";
1e422769 1276
7918f24d
NC
1277 PERL_ARGS_ASSERT_MAGIC_SETENV;
1278
613c63b4 1279 SvGETMAGIC(sv);
12033064 1280 if (SvOK(sv)) {
613c63b4
CS
1281 /* defined environment variables are byte strings; unfortunately
1282 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1283 (void)SvPV_force_nomg_nolen(sv);
1284 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1285 if (SvUTF8(sv)) {
1286 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1287 SvUTF8_off(sv);
1288 }
1289 s = SvPVX(sv);
1290 len = SvCUR(sv);
12033064
CS
1291 }
1292 my_setenv(key, s); /* does the deed */
1293
a0d0e21e
LW
1294#ifdef DYNAMIC_ENV_FETCH
1295 /* We just undefd an environment var. Is a replacement */
1296 /* waiting in the wings? */
1297 if (!len) {
6bd66ee9 1298 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1299 if (valp)
4ab59fcc 1300 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1301 }
1302#endif
1e422769 1303
28542d8f 1304#if !defined(OS2) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1305 /* And you'll never guess what the dog had */
1306 /* in its mouth... */
284167a5 1307 if (TAINTING_get) {
1e422769
PP
1308 MgTAINTEDDIR_off(mg);
1309#ifdef VMS
b2aed775 1310 if (s && memEQs(key, klen, "DCL$PATH")) {
b8ffc8df 1311 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769
PP
1312 int i = 0, j = 0;
1313
6fca0082 1314 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1315 elt = eltbuf;
1e422769
PP
1316 do { /* DCL$PATH may be a search list */
1317 while (1) { /* as may dev portion of any element */
1318 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1319 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1320 cando_by_name(S_IWUSR,0,elt) ) {
1321 MgTAINTEDDIR_on(mg);
1322 return 0;
1323 }
1324 }
bd61b366 1325 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1326 *cp = '\0';
1327 if (my_trnlnm(elt, eltbuf, j++))
1328 elt = eltbuf;
1329 else
1330 break;
1331 }
1332 j = 0;
1333 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1334 }
1335#endif /* VMS */
b2aed775 1336 if (s && memEQs(key, klen, "PATH")) {
8772537c 1337 const char * const strend = s + len;
463ee0b2 1338
70b484a8
DM
1339 /* set MGf_TAINTEDDIR if any component of the new path is
1340 * relative or world-writeable */
463ee0b2 1341 while (s < strend) {
96827780 1342 char tmpbuf[256];
c623ac67 1343 Stat_t st;
5f74f29c 1344 I32 i;
83269ced
CB
1345#ifdef __VMS /* Hmm. How do we get $Config{path_sep} from C? */
1346 const char path_sep = PL_perllib_sep;
f5a63d97
AL
1347#else
1348 const char path_sep = ':';
1349#endif
ba0a4150 1350 s = delimcpy_no_escape(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1351 s, strend, path_sep, &i);
463ee0b2 1352 s++;
bb7a0f54 1353 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
83269ced
CB
1354#ifdef __VMS
1355 /* no colon thus no device name -- assume relative path */
1356 || (PL_perllib_sep != ':' && !strchr(tmpbuf, ':'))
1357 /* Using Unix separator, e.g. under bash, so act line Unix */
1358 || (PL_perllib_sep == ':' && *tmpbuf != '/')
326b5008
CB
1359#else
1360 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1361#endif
c6ed36e1 1362 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1363 MgTAINTEDDIR_on(mg);
1e422769
PP
1364 return 0;
1365 }
463ee0b2 1366 }
79072805
LW
1367 }
1368 }
28542d8f 1369#endif /* neither OS2 nor WIN32 nor MSDOS */
1e422769 1370
79072805
LW
1371 return 0;
1372}
1373
1374int
864dbfa3 1375Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1376{
7918f24d 1377 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1378 PERL_UNUSED_ARG(sv);
bd61b366 1379 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1380 return 0;
1381}
1382
88e89b8a 1383int
864dbfa3 1384Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1385{
7918f24d 1386 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1387 PERL_UNUSED_ARG(mg);
b0269e46 1388#if defined(VMS)
cea2e8a9 1389 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1390#else
3280af22 1391 if (PL_localizing) {
fb73857a 1392 HE* entry;
b0269e46 1393 my_clearenv();
85fbaab2
NC
1394 hv_iterinit(MUTABLE_HV(sv));
1395 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1396 I32 keylen;
1397 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1398 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1399 }
1400 }
1401#endif
1402 return 0;
1403}
1404
1405int
864dbfa3 1406Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1407{
7918f24d 1408 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1409 PERL_UNUSED_ARG(sv);
1410 PERL_UNUSED_ARG(mg);
b0269e46
AB
1411#if defined(VMS)
1412 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1413#else
1414 my_clearenv();
1415#endif
3e3baf6d 1416 return 0;
66b1d557
HM
1417}
1418
64ca3a65 1419#ifndef PERL_MICRO
2d4fcd5e
AJ
1420#ifdef HAS_SIGPROCMASK
1421static void
1422restore_sigmask(pTHX_ SV *save_sv)
1423{
0bd48802 1424 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1425 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1426}
1427#endif
66b1d557 1428int
864dbfa3 1429Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1430{
88e89b8a 1431 /* Are we fetching a signal entry? */
708854f2 1432 int i = (I16)mg->mg_private;
7918f24d
NC
1433
1434 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1435
708854f2 1436 if (!i) {
84c7b88c
BF
1437 STRLEN siglen;
1438 const char * sig = MgPV_const(mg, siglen);
1439 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC
1440 }
1441
e02bfb16 1442 if (i > 0) {
22c35a8c
GS
1443 if(PL_psig_ptr[i])
1444 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1445 else {
46da273f 1446 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1447#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1448 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1449 sigstate = SIG_IGN;
2e34cc90
CL
1450#endif
1451#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1452 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1453 sigstate = SIG_DFL;
85b332e2 1454#endif
88e89b8a 1455 /* cache state so we don't fetch it again */
8aad04aa 1456 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1457 sv_setpvs(sv,"IGNORE");
88e89b8a 1458 else
e03e82a0 1459 sv_set_undef(sv);
46da273f 1460 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1461 SvTEMP_off(sv);
1462 }
1463 }
1464 return 0;
1465}
1466int
864dbfa3 1467Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1468{
7918f24d 1469 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1470
38a124f0 1471 magic_setsig(NULL, mg);
179c85a2 1472 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1473}
3d37d572 1474
0a8e0eff 1475Signal_t
8aad04aa 1476#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1477Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1478#else
0a8e0eff 1479Perl_csighandler(int sig)
8aad04aa 1480#endif
0a8e0eff 1481{
1018e26f
NIS
1482#ifdef PERL_GET_SIG_CONTEXT
1483 dTHXa(PERL_GET_SIG_CONTEXT);
1484#else
85b332e2
CL
1485 dTHX;
1486#endif
1271a1be 1487#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
ffb6256b
JH
1488#if defined(__cplusplus) && defined(__GNUC__)
1489 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1490 * parameters would be warned about. */
1491 PERL_UNUSED_ARG(sip);
1492 PERL_UNUSED_ARG(uap);
1493#endif
1271a1be 1494#endif
23ada85b 1495#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1496 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1497 if (PL_sig_ignoring[sig]) return;
85b332e2 1498#endif
2e34cc90 1499#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1500 if (PL_sig_defaulting[sig])
2e34cc90
CL
1501#ifdef KILL_BY_SIGPRC
1502 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1503#else
1504 exit(1);
1505#endif
1506#endif
406878dd 1507 if (
853d2c32
RGS
1508#ifdef SIGILL
1509 sig == SIGILL ||
1510#endif
1511#ifdef SIGBUS
1512 sig == SIGBUS ||
1513#endif
1514#ifdef SIGSEGV
1515 sig == SIGSEGV ||
1516#endif
1517 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1518 /* Call the perl level handler now--
31c91b43 1519 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1520#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1521 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1522#else
1523 (*PL_sighandlerp)(sig);
92807b6d 1524#endif
406878dd 1525 else {
31c91b43 1526 if (!PL_psig_pend) return;
406878dd
GA
1527 /* Set a flag to say this signal is pending, that is awaiting delivery after
1528 * the current Perl opcode completes */
1529 PL_psig_pend[sig]++;
1530
1531#ifndef SIG_PENDING_DIE_COUNT
1532# define SIG_PENDING_DIE_COUNT 120
1533#endif
fe13d51d 1534 /* Add one to say _a_ signal is pending */
406878dd
GA
1535 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1536 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1537 (unsigned long)SIG_PENDING_DIE_COUNT);
1538 }
0a8e0eff
NIS
1539}
1540
2e34cc90
CL
1541#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1542void
1543Perl_csighandler_init(void)
1544{
1545 int sig;
27da23d5 1546 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1547
1548 for (sig = 1; sig < SIG_SIZE; sig++) {
1549#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1550 dTHX;
27da23d5 1551 PL_sig_defaulting[sig] = 1;
5c1546dc 1552 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1553#endif
1554#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1555 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1556#endif
1557 }
27da23d5 1558 PL_sig_handlers_initted = 1;
2e34cc90
CL
1559}
1560#endif
1561
7fe50b8b
LT
1562#if defined HAS_SIGPROCMASK
1563static void
1564unblock_sigmask(pTHX_ void* newset)
1565{
dc3bf405 1566 PERL_UNUSED_CONTEXT;
7fe50b8b
LT
1567 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1568}
1569#endif
1570
0a8e0eff
NIS
1571void
1572Perl_despatch_signals(pTHX)
1573{
1574 int sig;
1575 PL_sig_pending = 0;
1576 for (sig = 1; sig < SIG_SIZE; sig++) {
1577 if (PL_psig_pend[sig]) {
d0166017 1578 dSAVE_ERRNO;
7fe50b8b 1579#ifdef HAS_SIGPROCMASK
55534442
LT
1580 /* From sigaction(2) (FreeBSD man page):
1581 * | Signal routines normally execute with the signal that
1582 * | caused their invocation blocked, but other signals may
1583 * | yet occur.
1584 * Emulation of this behavior (from within Perl) is enabled
1585 * using sigprocmask
1586 */
1587 int was_blocked;
1588 sigset_t newset, oldset;
1589
1590 sigemptyset(&newset);
1591 sigaddset(&newset, sig);
1592 sigprocmask(SIG_BLOCK, &newset, &oldset);
1593 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT
1594 if (!was_blocked) {
1595 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1596 ENTER;
1597 SAVEFREESV(save_sv);
1598 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1599 }
55534442 1600#endif
25da4428 1601 PL_psig_pend[sig] = 0;
6e324d09 1602#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1603 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1604#else
1605 (*PL_sighandlerp)(sig);
92807b6d 1606#endif
7fe50b8b 1607#ifdef HAS_SIGPROCMASK
55534442 1608 if (!was_blocked)
7fe50b8b 1609 LEAVE;
55534442 1610#endif
d0166017 1611 RESTORE_ERRNO;
0a8e0eff
NIS
1612 }
1613 }
1614}
1615
38a124f0 1616/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1617int
864dbfa3 1618Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1619{
27da23d5 1620 dVAR;
79072805 1621 I32 i;
cbbf8932 1622 SV** svp = NULL;
2d4fcd5e
AJ
1623 /* Need to be careful with SvREFCNT_dec(), because that can have side
1624 * effects (due to closures). We must make sure that the new disposition
1625 * is in place before it is called.
1626 */
cbbf8932 1627 SV* to_dec = NULL;
e72dc28c 1628 STRLEN len;
2d4fcd5e
AJ
1629#ifdef HAS_SIGPROCMASK
1630 sigset_t set, save;
1631 SV* save_sv;
1632#endif
eb578fdb 1633 const char *s = MgPV_const(mg,len);
7918f24d
NC
1634
1635 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1636
748a9306 1637 if (*s == '_') {
84c7b88c 1638 if (memEQs(s, len, "__DIE__"))
3280af22 1639 svp = &PL_diehook;
84c7b88c 1640 else if (memEQs(s, len, "__WARN__")
38a124f0
NC
1641 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1642 /* Merge the existing behaviours, which are as follows:
1643 magic_setsig, we always set svp to &PL_warnhook
1644 (hence we always change the warnings handler)
1645 For magic_clearsig, we don't change the warnings handler if it's
1646 set to the &PL_warnhook. */
3280af22 1647 svp = &PL_warnhook;
84c7b88c
BF
1648 } else if (sv) {
1649 SV *tmp = sv_newmortal();
1650 Perl_croak(aTHX_ "No such hook: %s",
1651 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1652 }
748a9306 1653 i = 0;
38a124f0 1654 if (svp && *svp) {
9289f461
RGS
1655 if (*svp != PERL_WARNHOOK_FATAL)
1656 to_dec = *svp;
cbbf8932 1657 *svp = NULL;
4633a7c4 1658 }
748a9306
LW
1659 }
1660 else {
708854f2
NC
1661 i = (I16)mg->mg_private;
1662 if (!i) {
84c7b88c 1663 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1664 mg->mg_private = (U16)i;
708854f2 1665 }
86d86cad 1666 if (i <= 0) {
84c7b88c
BF
1667 if (sv) {
1668 SV *tmp = sv_newmortal();
1669 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1670 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1671 }
748a9306
LW
1672 return 0;
1673 }
2d4fcd5e
AJ
1674#ifdef HAS_SIGPROCMASK
1675 /* Avoid having the signal arrive at a bad time, if possible. */
1676 sigemptyset(&set);
1677 sigaddset(&set,i);
1678 sigprocmask(SIG_BLOCK, &set, &save);
1679 ENTER;
9ff8e806 1680 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1681 SAVEFREESV(save_sv);
1682 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1683#endif
1684 PERL_ASYNC_CHECK();
2e34cc90 1685#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1686 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1687#endif
23ada85b 1688#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1689 PL_sig_ignoring[i] = 0;
85b332e2 1690#endif
2e34cc90 1691#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1692 PL_sig_defaulting[i] = 0;
2e34cc90 1693#endif
2d4fcd5e 1694 to_dec = PL_psig_ptr[i];
38a124f0
NC
1695 if (sv) {
1696 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1697 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1698
1699 /* Signals don't change name during the program's execution, so once
1700 they're cached in the appropriate slot of PL_psig_name, they can
1701 stay there.
1702
1703 Ideally we'd find some way of making SVs at (C) compile time, or
1704 at least, doing most of the work. */
1705 if (!PL_psig_name[i]) {
1706 PL_psig_name[i] = newSVpvn(s, len);
1707 SvREADONLY_on(PL_psig_name[i]);
1708 }
38a124f0 1709 } else {
79fd3822 1710 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1711 PL_psig_name[i] = NULL;
1712 PL_psig_ptr[i] = NULL;
1713 }
748a9306 1714 }
38a124f0 1715 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1716 if (i) {
5c1546dc 1717 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1718 }
748a9306 1719 else
b37c2d43 1720 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1721 } else {
9dfa190b
NC
1722 if (sv && SvOK(sv)) {
1723 s = SvPV_force(sv, len);
1724 } else {
1725 sv = NULL;
1726 }
84c7b88c 1727 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1728 if (i) {
23ada85b 1729#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1730 PL_sig_ignoring[i] = 1;
1731 (void)rsignal(i, PL_csighandlerp);
85b332e2 1732#else
9dfa190b 1733 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1734#endif
9dfa190b 1735 }
2d4fcd5e 1736 }
84c7b88c 1737 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1738 if (i) {
2e34cc90 1739#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1740 PL_sig_defaulting[i] = 1;
1741 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1742#else
9dfa190b 1743 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1744#endif
9dfa190b
NC
1745 }
1746 }
1747 else {
1748 /*
1749 * We should warn if HINT_STRICT_REFS, but without
1750 * access to a known hint bit in a known OP, we can't
1751 * tell whether HINT_STRICT_REFS is in force or not.
1752 */
0687887e 1753 if (!memchr(s, ':', len) && !memchr(s, '\'', len))
9dfa190b
NC
1754 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1755 SV_GMAGIC);
1756 if (i)
1757 (void)rsignal(i, PL_csighandlerp);
1758 else
1759 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1760 }
748a9306 1761 }
9dfa190b 1762
2d4fcd5e
AJ
1763#ifdef HAS_SIGPROCMASK
1764 if(i)
1765 LEAVE;
1766#endif
ef8d46e8 1767 SvREFCNT_dec(to_dec);
79072805
LW
1768 return 0;
1769}
64ca3a65 1770#endif /* !PERL_MICRO */
79072805
LW
1771
1772int
864dbfa3 1773Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1774{
7918f24d 1775 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1776 PERL_UNUSED_ARG(sv);
e1a479c5 1777
89c14e2e 1778 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1779 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB
1780 return 0;
1781
0e446081 1782 return magic_clearisa(NULL, mg);
463ee0b2
LW
1783}
1784
0e446081 1785/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1786int
52b45067
RD
1787Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1788{
52b45067 1789 HV* stash;
7918f24d
NC
1790 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1791
52b45067 1792 /* Bail out if destruction is going on */
627364f1 1793 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1794
0e446081
NC
1795 if (sv)
1796 av_clear(MUTABLE_AV(sv));
52b45067 1797
6624142a
FC
1798 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1799 /* This occurs with setisa_elem magic, which calls this
1800 same function. */
1801 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1802
316ebaf2 1803 assert(mg);
6624142a
FC
1804 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1805 SV **svp = AvARRAY((AV *)mg->mg_obj);
1806 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1807 while (items--) {
1808 stash = GvSTASH((GV *)*svp++);
1809 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1810 }
1811
1812 return 0;
1813 }
1814
52b45067 1815 stash = GvSTASH(
6624142a 1816 (const GV *)mg->mg_obj
52b45067
RD
1817 );
1818
00169e2c
FC
1819 /* The stash may have been detached from the symbol table, so check its
1820 name before doing anything. */
1821 if (stash && HvENAME_get(stash))
5562fa71 1822 mro_isa_changed_in(stash);
52b45067
RD
1823
1824 return 0;
1825}
1826
1827int
864dbfa3 1828Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1829{
85fbaab2 1830 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1831 I32 i = 0;
7918f24d
NC
1832
1833 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1834 PERL_UNUSED_ARG(mg);
7719e241 1835
6ff81951 1836 if (hv) {
497b47a8 1837 (void) hv_iterinit(hv);
ad64d0ec 1838 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1839 i = HvUSEDKEYS(hv);
497b47a8
JH
1840 else {
1841 while (hv_iternext(hv))
1842 i++;
1843 }
6ff81951
GS
1844 }
1845
1846 sv_setiv(sv, (IV)i);
1847 return 0;
1848}
1849
1850int
864dbfa3 1851Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1852{
7918f24d 1853 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1854 PERL_UNUSED_ARG(mg);
946ec16e 1855 if (LvTARG(sv)) {
85fbaab2 1856 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1857 }
1858 return 0;
ac27b0f5 1859}
946ec16e 1860
efaf3674
DM
1861/*
1862=for apidoc magic_methcall
1863
1864Invoke a magic method (like FETCH).
1865
2baee27b
FC
1866C<sv> and C<mg> are the tied thingy and the tie magic.
1867
1868C<meth> is the name of the method to call.
1869
1870C<argc> is the number of args (in addition to $self) to pass to the method.
1871
1872The C<flags> can be:
1873
1874 G_DISCARD invoke method with G_DISCARD flag and don't
1875 return a value
1876 G_UNDEF_FILL fill the stack with argc pointers to
1877 PL_sv_undef
1878
1879The arguments themselves are any values following the C<flags> argument.
efaf3674 1880
796b6530 1881Returns the SV (if any) returned by the method, or C<NULL> on failure.
efaf3674
DM
1882
1883
1884=cut
1885*/
1886
1887SV*
36925d9e 1888Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1889 U32 argc, ...)
a0d0e21e
LW
1890{
1891 dSP;
efaf3674 1892 SV* ret = NULL;
463ee0b2 1893
7918f24d
NC
1894 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1895
efaf3674 1896 ENTER;
d1d7a15d
NC
1897
1898 if (flags & G_WRITING_TO_STDERR) {
1899 SAVETMPS;
1900
2782061f 1901 save_re_context();
d1d7a15d
NC
1902 SAVESPTR(PL_stderrgv);
1903 PL_stderrgv = NULL;
1904 }
1905
efaf3674 1906 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1907 PUSHMARK(SP);
efaf3674 1908
052a7c76
DM
1909 /* EXTEND() expects a signed argc; don't wrap when casting */
1910 assert(argc <= I32_MAX);
1911 EXTEND(SP, (I32)argc+1);
67549bd2
NC
1912 PUSHs(SvTIED_obj(sv, mg));
1913 if (flags & G_UNDEF_FILL) {
1914 while (argc--) {
efaf3674 1915 PUSHs(&PL_sv_undef);
93965878 1916 }
67549bd2 1917 } else if (argc > 0) {
046b0c7d
NC
1918 va_list args;
1919 va_start(args, argc);
1920
1921 do {
1922 SV *const sv = va_arg(args, SV *);
1923 PUSHs(sv);
1924 } while (--argc);
1925
1926 va_end(args);
88e89b8a 1927 }
463ee0b2 1928 PUTBACK;
efaf3674 1929 if (flags & G_DISCARD) {
36925d9e 1930 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM
1931 }
1932 else {
36925d9e 1933 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM
1934 ret = *PL_stack_sp--;
1935 }
1936 POPSTACK;
d1d7a15d
NC
1937 if (flags & G_WRITING_TO_STDERR)
1938 FREETMPS;
efaf3674
DM
1939 LEAVE;
1940 return ret;
1941}
1942
efaf3674 1943/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1944
efaf3674 1945STATIC SV*
36925d9e 1946S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM
1947 int n, SV *val)
1948{
efaf3674
DM
1949 SV* arg1 = NULL;
1950
1951 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1952
1953 if (mg->mg_ptr) {
1954 if (mg->mg_len >= 0) {
db4b3a1d 1955 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM
1956 }
1957 else if (mg->mg_len == HEf_SVKEY)
1958 arg1 = MUTABLE_SV(mg->mg_ptr);
1959 }
1960 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1961 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM
1962 sv_2mortal(arg1);
1963 }
1964 if (!arg1) {
046b0c7d 1965 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1966 }
046b0c7d 1967 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e
PP
1968}
1969
76e3520e 1970STATIC int
36925d9e 1971S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1972{
efaf3674 1973 SV* ret;
463ee0b2 1974
7918f24d
NC
1975 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1976
efaf3674
DM
1977 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1978 if (ret)
1979 sv_setsv(sv, ret);
a0d0e21e
LW
1980 return 0;
1981}
463ee0b2 1982
a0d0e21e 1983int
864dbfa3 1984Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1985{
7918f24d
NC
1986 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1987
fd69380d 1988 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1989 mg->mg_flags |= MGf_GSKIP;
36925d9e 1990 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW
1991 return 0;
1992}
1993
1994int
864dbfa3 1995Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1996{
b112cff9
DM
1997 MAGIC *tmg;
1998 SV *val;
7918f24d
NC
1999
2000 PERL_ARGS_ASSERT_MAGIC_SETPACK;
2001
b112cff9
DM
2002 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
2003 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
2004 * public flags indicate its value based on copying from $val. Doing
2005 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
2006 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
2007 * wrong if $val happened to be tainted, as sv hasn't got magic
2008 * enabled, even though taint magic is in the chain. In which case,
2009 * fake up a temporary tainted value (this is easier than temporarily
2010 * re-enabling magic on sv). */
2011
284167a5 2012 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM
2013 && (tmg->mg_len & 1))
2014 {
2015 val = sv_mortalcopy(sv);
2016 SvTAINTED_on(val);
2017 }
2018 else
2019 val = sv;
2020
36925d9e 2021 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW
2022 return 0;
2023}
2024
2025int
864dbfa3 2026Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2027{
7918f24d
NC
2028 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
2029
4c13be3f 2030 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 2031 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 2032}
463ee0b2 2033
93965878
NIS
2034
2035U32
864dbfa3 2036Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 2037{
22846ab4 2038 I32 retval = 0;
efaf3674 2039 SV* retsv;
93965878 2040
7918f24d
NC
2041 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
2042
36925d9e 2043 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM
2044 if (retsv) {
2045 retval = SvIV(retsv)-1;
22846ab4
AB
2046 if (retval < -1)
2047 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 2048 }
22846ab4 2049 return (U32) retval;
93965878
NIS
2050}
2051
cea2e8a9
GS
2052int
2053Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2054{
7918f24d
NC
2055 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
2056
36925d9e 2057 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW
2058 return 0;
2059}
2060
2061int
864dbfa3 2062Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 2063{
efaf3674 2064 SV* ret;
463ee0b2 2065
7918f24d
NC
2066 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
2067
36925d9e
RZ
2068 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
2069 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM
2070 if (ret)
2071 sv_setsv(key,ret);
79072805
LW
2072 return 0;
2073}
2074
2075int
1146e912 2076Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 2077{
7918f24d
NC
2078 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
2079
36925d9e 2080 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 2081}
a0d0e21e 2082
a3bcc51e
TP
2083SV *
2084Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
2085{
5fcbf73d 2086 SV *retval;
ad64d0ec
NC
2087 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
2088 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 2089
7918f24d
NC
2090 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
2091
a3bcc51e
TP
2092 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
2093 SV *key;
bfcb3514 2094 if (HvEITER_get(hv))
a3bcc51e
TP
2095 /* we are in an iteration so the hash cannot be empty */
2096 return &PL_sv_yes;
2097 /* no xhv_eiter so now use FIRSTKEY */
2098 key = sv_newmortal();
ad64d0ec 2099 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2100 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
2101 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2102 }
2103
2104 /* there is a SCALAR method that we can call */
36925d9e 2105 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2106 if (!retval)
5fcbf73d 2107 retval = &PL_sv_undef;
a3bcc51e
TP
2108 return retval;
2109}
2110
a0d0e21e 2111int
864dbfa3 2112Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2113{
089b5c60 2114 SV **svp;
7918f24d
NC
2115
2116 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2117
089b5c60
NC
2118 /* The magic ptr/len for the debugger's hash should always be an SV. */
2119 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
147e3846 2120 Perl_croak(aTHX_ "panic: magic_setdbline len=%" IVdf ", ptr='%s'",
7b0eb0b8 2121 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC
2122 }
2123
2124 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2125 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC
2126 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2127 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2128
8772537c 2129 if (svp && SvIOKp(*svp)) {
88df5f01
FC
2130 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2131 if (o) {
2132#ifdef PERL_DEBUG_READONLY_OPS
2133 Slab_to_rw(OpSLAB(o));
2134#endif
2135 /* set or clear breakpoint in the relevant control op */
089b5c60 2136 if (SvTRUE(sv))
88df5f01 2137 o->op_flags |= OPf_SPECIAL;
8772537c 2138 else
88df5f01
FC
2139 o->op_flags &= ~OPf_SPECIAL;
2140#ifdef PERL_DEBUG_READONLY_OPS
2141 Slab_to_ro(OpSLAB(o));
2142#endif
8772537c 2143 }
5df8de69 2144 }
79072805
LW
2145 return 0;
2146}
2147
2148int
8772537c 2149Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2150{
502c6561 2151 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2152
2153 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2154
83bf042f 2155 if (obj) {
e1dccc0d 2156 sv_setiv(sv, AvFILL(obj));
83bf042f 2157 } else {
3773545d 2158 sv_set_undef(sv);
83bf042f 2159 }
79072805
LW
2160 return 0;
2161}
2162
2163int
864dbfa3 2164Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2165{
502c6561 2166 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
2167
2168 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2169
83bf042f 2170 if (obj) {
e1dccc0d 2171 av_fill(obj, SvIV(sv));
83bf042f 2172 } else {
a2a5de95
NC
2173 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2174 "Attempt to set length of freed array");
83bf042f
NC
2175 }
2176 return 0;
2177}
2178
2179int
83f29afa
VP
2180Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2181{
83f29afa
VP
2182 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2183 PERL_UNUSED_ARG(sv);
dc3bf405 2184 PERL_UNUSED_CONTEXT;
83f29afa
VP
2185
2186 /* Reset the iterator when the array is cleared */
4803e7f7
Z
2187 if (sizeof(IV) == sizeof(SSize_t)) {
2188 *((IV *) &(mg->mg_len)) = 0;
2189 } else {
2190 if (mg->mg_ptr)
2191 *((IV *) mg->mg_ptr) = 0;
2192 }
83f29afa
VP
2193
2194 return 0;
2195}
2196
2197int
83bf042f
NC
2198Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2199{
7918f24d 2200 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2201 PERL_UNUSED_ARG(sv);
7918f24d 2202
94f3782b
DM
2203 /* during global destruction, mg_obj may already have been freed */
2204 if (PL_in_clean_all)
1ea47f64 2205 return 0;
94f3782b 2206
83bf042f
NC
2207 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2208
2209 if (mg) {
2210 /* arylen scalar holds a pointer back to the array, but doesn't own a
2211 reference. Hence the we (the array) are about to go away with it
2212 still pointing at us. Clear its pointer, else it would be pointing
2213 at free memory. See the comment in sv_magic about reference loops,
2214 and why it can't own a reference to us. */
2215 mg->mg_obj = 0;
2216 }
a0d0e21e
LW
2217 return 0;
2218}
2219
2220int
864dbfa3 2221Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2222{
16eb5365 2223 SV* const lsv = LvTARG(sv);
96c2a8ff 2224 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC
2225
2226 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2227 PERL_UNUSED_ARG(mg);
ac27b0f5 2228
6174b39a
FC
2229 if (found && found->mg_len != -1) {
2230 STRLEN i = found->mg_len;
25fdce4a 2231 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC
2232 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2233 sv_setuv(sv, i);
a0d0e21e 2234 return 0;
a0d0e21e 2235 }
3773545d 2236 sv_set_undef(sv);
a0d0e21e
LW
2237 return 0;
2238}
2239
2240int
864dbfa3 2241Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2242{
16eb5365 2243 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
2244 SSize_t pos;
2245 STRLEN len;
53d44271 2246 MAGIC* found;
aec43834 2247 const char *s;
a0d0e21e 2248
7918f24d 2249 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2250 PERL_UNUSED_ARG(mg);
ac27b0f5 2251
96c2a8ff 2252 found = mg_find_mglob(lsv);
3881461a 2253 if (!found) {
a0d0e21e
LW
2254 if (!SvOK(sv))
2255 return 0;
96c2a8ff 2256 found = sv_magicext_mglob(lsv);
a0d0e21e
LW
2257 }
2258 else if (!SvOK(sv)) {
3881461a 2259 found->mg_len = -1;
a0d0e21e
LW
2260 return 0;
2261 }
aec43834 2262 s = SvPV_const(lsv, len);
a0d0e21e 2263
e1dccc0d 2264 pos = SvIV(sv);
a0ed51b3 2265
7e2040f0 2266 if (DO_UTF8(lsv)) {
19742f39 2267 const STRLEN ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW
2268 if (ulen)
2269 len = ulen;
a0ed51b3
LW
2270 }
2271
a0d0e21e
LW
2272 if (pos < 0) {
2273 pos += len;
2274 if (pos < 0)
2275 pos = 0;
2276 }
eb160463 2277 else if (pos > (SSize_t)len)
a0d0e21e 2278 pos = len;
a0ed51b3 2279
3881461a 2280 found->mg_len = pos;
25fdce4a 2281 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2282
79072805
LW
2283 return 0;
2284}
2285
2286int
864dbfa3 2287Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2288{
2289 STRLEN len;
35a4481c 2290 SV * const lsv = LvTARG(sv);
b83604b4 2291 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB
2292 STRLEN offs = LvTARGOFF(sv);
2293 STRLEN rem = LvTARGLEN(sv);
b063b0a8
DIM
2294 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2295 const bool negrem = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2296
2297 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2298 PERL_UNUSED_ARG(mg);
6ff81951 2299
83f78d1a 2300 if (!translate_substr_offsets(
4ddea69a 2301 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC
2302 negoff ? -(IV)offs : (IV)offs, !negoff,
2303 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2304 )) {
2305 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
e03e82a0 2306 sv_set_undef(sv);
83f78d1a
FC
2307 return 0;
2308 }
2309
9aa983d2 2310 if (SvUTF8(lsv))
4ddea69a 2311 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2312 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2313 if (SvUTF8(lsv))
2ef4b674 2314 SvUTF8_on(sv);
6ff81951
GS
2315 return 0;
2316}
2317
2318int
864dbfa3 2319Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2320{
83f78d1a 2321 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2322 const char * const tmps = SvPV_const(sv, len);
dd374669 2323 SV * const lsv = LvTARG(sv);
777f7c56
EB
2324 STRLEN lvoff = LvTARGOFF(sv);
2325 STRLEN lvlen = LvTARGLEN(sv);
b063b0a8
DIM
2326 const bool negoff = LvFLAGS(sv) & LVf_NEG_OFF;
2327 const bool neglen = LvFLAGS(sv) & LVf_NEG_LEN;
7918f24d
NC
2328
2329 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2330 PERL_UNUSED_ARG(mg);
075a4a2b 2331
a74fb2cd
FC
2332 SvGETMAGIC(lsv);
2333 if (SvROK(lsv))
2334 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2335 "Attempt to use reference as lvalue in substr"
2336 );
fc061ed8
FC
2337 SvPV_force_nomg(lsv,lsv_len);
2338 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC
2339 if (!translate_substr_offsets(
2340 lsv_len,
2341 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2342 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2343 ))
2344 Perl_croak(aTHX_ "substr outside of string");
2345 oldtarglen = lvlen;
1aa99e6b 2346 if (DO_UTF8(sv)) {
73a087f0 2347 sv_utf8_upgrade_nomg(lsv);
d931b1be 2348 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2349 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2350 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH
2351 SvUTF8_on(lsv);
2352 }
0d336106 2353 else if (SvUTF8(lsv)) {
5fcbf73d 2354 const char *utf8;
d931b1be 2355 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2356 newtarglen = len;
5fcbf73d 2357 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2358 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2359 Safefree(utf8);
1aa99e6b 2360 }
b76f3ce2 2361 else {
a74fb2cd 2362 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2363 newtarglen = len;
b76f3ce2 2364 }
83f78d1a
FC
2365 if (!neglen) LvTARGLEN(sv) = newtarglen;
2366 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2367
79072805
LW
2368 return 0;
2369}
2370
2371int
864dbfa3 2372Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2373{
7918f24d 2374 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2375 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM
2376#ifdef NO_TAINT_SUPPORT
2377 PERL_UNUSED_ARG(mg);
2378#endif
7918f24d 2379
64ff300b 2380 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW
2381 return 0;
2382}
2383
2384int
864dbfa3 2385Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2386{
7918f24d 2387 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2388 PERL_UNUSED_ARG(sv);
7918f24d 2389
b01e650a 2390 /* update taint status */
284167a5 2391 if (TAINT_get)
b01e650a
DM
2392 mg->mg_len |= 1;
2393 else
2394 mg->mg_len &= ~1;
463ee0b2
LW
2395 return 0;
2396}
2397
2398int
864dbfa3 2399Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2400{
35a4481c 2401 SV * const lsv = LvTARG(sv);
1b92e694 2402 char errflags = LvFLAGS(sv);
7918f24d
NC
2403
2404 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2405 PERL_UNUSED_ARG(mg);
6ff81951 2406
1b92e694 2407 /* non-zero errflags implies deferred out-of-range condition */
b063b0a8 2408 assert(!(errflags & ~(LVf_NEG_OFF|LVf_OUT_OF_RANGE)));
1b92e694 2409 sv_setuv(sv, errflags ? 0 : do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2410
6ff81951
GS
2411 return 0;
2412}
2413
2414int
864dbfa3 2415Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2416{
7918f24d 2417 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2418 PERL_UNUSED_ARG(mg);
79072805
LW
2419 do_vecset(sv); /* XXX slurp this routine */
2420 return 0;
2421}
2422
13733cde
FC
2423SV *
2424Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2425{
a0714e2c 2426 SV *targ = NULL;
13733cde
FC
2427 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2428 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2429 assert(mg);
5f05dabc 2430 if (LvTARGLEN(sv)) {
68dc0745 2431 if (mg->mg_obj) {
8772537c 2432 SV * const ahv = LvTARG(sv);
85fbaab2 2433 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2434 if (he)
2435 targ = HeVAL(he);
68dc0745 2436 }
bbfdc870 2437 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2438 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2439 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC
2440 {
2441 if (SvRMAGICAL(av)) {
2442 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2443 targ = svp ? *svp : NULL;
2444 }
2445 else
bbfdc870 2446 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2447 }
68dc0745 2448 }
46da273f 2449 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2450 /* somebody else defined it for us */
2451 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2452 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2453 LvTARGLEN(sv) = 0;
2454 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2455 mg->mg_obj = NULL;
68dc0745
PP
2456 mg->mg_flags &= ~MGf_REFCOUNTED;
2457 }
13733cde 2458 return targ;
5f05dabc 2459 }
71be2cbc 2460 else
13733cde
FC
2461 return LvTARG(sv);
2462}
2463
2464int
2465Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2466{
2467 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2468
2469 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc
PP
2470 return 0;
2471}
2472
2473int
864dbfa3 2474Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2475{
7918f24d 2476 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2477 PERL_UNUSED_ARG(mg);
71be2cbc 2478 if (LvTARGLEN(sv))
68dc0745
PP
2479 vivify_defelem(sv);
2480 if (LvTARG(sv)) {
5f05dabc 2481 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2482 SvSETMAGIC(LvTARG(sv));
2483 }
5f05dabc
PP
2484 return 0;
2485}
2486
71be2cbc 2487void
864dbfa3 2488Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2489{
74e13ce4 2490 MAGIC *mg;
a0714e2c 2491 SV *value = NULL;
71be2cbc 2492
7918f24d
NC
2493 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2494
14befaf4 2495 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2496 return;
68dc0745 2497 if (mg->mg_obj) {
8772537c 2498 SV * const ahv = LvTARG(sv);
85fbaab2 2499 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2500 if (he)
2501 value = HeVAL(he);
3280af22 2502 if (!value || value == &PL_sv_undef)
be2597df 2503 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2504 }
bbfdc870
FC
2505 else if (LvSTARGOFF(sv) < 0)
2506 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2507 else {
502c6561 2508 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2509 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2510 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2511 else {
bbfdc870 2512 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2513 if (!svp || !(value = *svp))
bbfdc870 2514 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745
PP
2515 }
2516 }
b37c2d43 2517 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2518 SvREFCNT_dec(LvTARG(sv));
2519 LvTARG(sv) = value;
71be2cbc 2520 LvTARGLEN(sv) = 0;
68dc0745 2521 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2522 mg->mg_obj = NULL;
68dc0745 2523 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2524}
2525
2526int
864dbfa3 2527Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2528{
7918f24d 2529 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM
2530 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2531 return 0;
810b8aa5
GS
2532}
2533
2534int
864dbfa3 2535Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2536{
7918f24d 2537 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2538 PERL_UNUSED_CONTEXT;
0177730e 2539 PERL_UNUSED_ARG(sv);
565764a8 2540 mg->mg_len = -1;
93a17b20
LW
2541 return 0;
2542}
2543
2544int
864dbfa3 2545Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2546{
35a4481c 2547 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2548
7918f24d
NC
2549 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2550
79072805 2551 if (uf && uf->uf_set)
24f81a43 2552 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2553 return 0;
2554}
2555
c277df42 2556int
faf82a0b
AE
2557Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2558{
488344d2 2559 const char type = mg->mg_type;
7918f24d
NC
2560
2561 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2562
a5c7cb08
DM
2563 assert( type == PERL_MAGIC_fm
2564 || type == PERL_MAGIC_qr
2565 || type == PERL_MAGIC_bm);
488344d2 2566 return sv_unmagic(sv, type);
faf82a0b
AE
2567}
2568
7a4c00b4 2569#ifdef USE_LOCALE_COLLATE
79072805 2570int
864dbfa3 2571Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2572{
7918f24d
NC
2573 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2574
bbce6d69 2575 /*
838b5b74 2576 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2577 * and vanished with a faint plop.
2578 */
96a5add6 2579 PERL_UNUSED_CONTEXT;
8772537c 2580 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2581 if (mg->mg_ptr) {
2582 Safefree(mg->mg_ptr);
2583 mg->mg_ptr = NULL;
565764a8 2584 mg->mg_len = -1;
7a4c00b4 2585 }
bbce6d69
PP
2586 return 0;
2587}
7a4c00b4 2588#endif /* USE_LOCALE_COLLATE */
bbce6d69 2589
7e8c5dac
HS
2590/* Just clear the UTF-8 cache data. */
2591int
2592Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2593{
7918f24d 2594 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2595 PERL_UNUSED_CONTEXT;
8772537c 2596 PERL_UNUSED_ARG(sv);
7e8c5dac 2597 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2598 mg->mg_ptr = NULL;
7e8c5dac
HS
2599 mg->mg_len = -1; /* The mg_len holds the len cache. */
2600 return 0;
2601}
2602
bbce6d69 2603int
9cce4f9a
FC
2604Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2605{
9782ce69 2606 const char *bad = NULL;
9cce4f9a 2607 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2608 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC
2609 switch (mg->mg_private & OPpLVREF_TYPE) {
2610 case OPpLVREF_SV:
2611 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2612 bad = " SCALAR";
2613 break;
2614 case OPpLVREF_AV:
2615 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2616 bad = "n ARRAY";
2617 break;
2618 case OPpLVREF_HV:
2619 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2620 bad = " HASH";
2621 break;
2622 case OPpLVREF_CV:
2623 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2624 bad = " CODE";
2625 }
2626 if (bad)
26a50d99 2627 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2628 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC
2629 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2630 case 0:
2631 {
2632 SV * const old = PAD_SV(mg->mg_len);
2633 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2634 SvREFCNT_dec(old);
2635 break;
2636 }
2637 case SVt_PVGV:
2638 gv_setref(mg->mg_obj, sv);
2639 SvSETMAGIC(mg->mg_obj);
6102323a
FC
2640 break;
2641 case SVt_PVAV:
2642 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2643 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC
2644 break;
2645 case SVt_PVHV:
7fcb36d5
JH
2646 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2647 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2648 }
d39c26a6
FC
2649 if (mg->mg_flags & MGf_PERSIST)
2650 NOOP; /* This sv is in use as an iterator var and will be reused,
2651 so we must leave the magic. */
2652 else
2653 /* This sv could be returned by the assignment op, so clear the
2654 magic, as lvrefs are an implementation detail that must not be
2655 leaked to the user. */
2656 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC
2657 return 0;
2658}
2659
f1540bed
JH
2660static void
2661S_set_dollarzero(pTHX_ SV *sv)
2662 PERL_TSA_REQUIRES(PL_dollarzero_mutex)
2663{
2664#ifdef USE_ITHREADS
2665 dVAR;
2666#endif
2667 const char *s;
2668 STRLEN len;
f1540bed
JH
2669#ifdef HAS_SETPROCTITLE
2670 /* The BSDs don't show the argv[] in ps(1) output, they
2671 * show a string from the process struct and provide
2672 * the setproctitle() routine to manipulate that. */
2673 if (PL_origalen != 1) {
2674 s = SvPV_const(sv, len);
38626956 2675# if __FreeBSD_version > 410001 || defined(__DragonFly__)
f1540bed
JH
2676 /* The leading "-" removes the "perl: " prefix,
2677 * but not the "(perl) suffix from the ps(1)
2678 * output, because that's what ps(1) shows if the
2679 * argv[] is modified. */
2680 setproctitle("-%s", s);
2681# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2682 /* This doesn't really work if you assume that
2683 * $0 = 'foobar'; will wipe out 'perl' from the $0
2684 * because in ps(1) output the result will be like
2685 * sprintf("perl: %s (perl)", s)
2686 * I guess this is a security feature:
2687 * one (a user process) cannot get rid of the original name.
2688 * --jhi */
2689 setproctitle("%s", s);
2690# endif
2691 }
2692#elif defined(__hpux) && defined(PSTAT_SETCMD)
2693 if (PL_origalen != 1) {
2694 union pstun un;
2695 s = SvPV_const(sv, len);
2696 un.pst_command = (char *)s;
2697 pstat(PSTAT_SETCMD, un, len, 0, 0);
2698 }
2699#else
2700 if (PL_origalen > 1) {
4f3e04fd 2701 I32 i;
f1540bed
JH
2702 /* PL_origalen is set in perl_parse(). */
2703 s = SvPV_force(sv,len);
2704 if (len >= (STRLEN)PL_origalen-1) {
2705 /* Longer than original, will be truncated. We assume that
2706 * PL_origalen bytes are available. */
2707 Copy(s, PL_origargv[0], PL_origalen-1, char);
2708 }
2709 else {
2710 /* Shorter than original, will be padded. */
2711#ifdef PERL_DARWIN
2712 /* Special case for Mac OS X: see [perl #38868] */
2713 const int pad = 0;
2714#else
2715 /* Is the space counterintuitive? Yes.
2716 * (You were expecting \0?)
2717 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2718 * --jhi */
2719 const int pad = ' ';
2720#endif
2721 Copy(s, PL_origargv[0], len, char);
2722 PL_origargv[0][len] = 0;
2723 memset(PL_origargv[0] + len + 1,
2724 pad, PL_origalen - len - 1);
2725 }
2726 PL_origargv[0][PL_origalen-1] = 0;
2727 for (i = 1; i < PL_origargc; i++)
2728 PL_origargv[i] = 0;
2729#ifdef HAS_PRCTL_SET_NAME
2730 /* Set the legacy process name in addition to the POSIX name on Linux */
2731 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
2732 /* diag_listed_as: SKIPME */
2733 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
2734 }
2735#endif
2736 }
2737#endif
2738}
2739
9cce4f9a 2740int
864dbfa3 2741Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2742{
20b7effb 2743#ifdef USE_ITHREADS
97aff369 2744 dVAR;
20b7effb 2745#endif
eb578fdb
KW
2746 I32 paren;
2747 const REGEXP * rx;
79072805 2748 I32 i;
8990e307 2749 STRLEN len;
125b9982 2750 MAGIC *tmg;
2fdbfb4d 2751
7918f24d
NC
2752 PERL_ARGS_ASSERT_MAGIC_SET;
2753
e91d8259 2754 if (!mg->mg_ptr) {
960b831f 2755 paren = mg->mg_len;
1e05feb3 2756 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2757 setparen_got_rx:
2fdbfb4d 2758 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2759 } else {
2fdbfb4d
AB
2760 /* Croak with a READONLY error when a numbered match var is
2761 * set without a previous pattern match. Unless it's C<local $1>
2762 */
e91d8259 2763 croakparen:
2fdbfb4d 2764 if (!PL_localizing) {
cb077ed2 2765 Perl_croak_no_modify();
2fdbfb4d
AB
2766 }
2767 }
e91d8259
NC
2768 return 0;
2769 }
2770
2771 switch (*mg->mg_ptr) {
748a9306 2772 case '\001': /* ^A */
f2da823f
FC
2773 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2774 else SvOK_off(PL_bodytarget);
64eff8b7
DM
2775 FmLINES(PL_bodytarget) = 0;
2776 if (SvPOK(PL_bodytarget)) {
2777 char *s = SvPVX(PL_bodytarget);
0687887e
KW
2778 char *e = SvEND(PL_bodytarget);
2779 while ( ((s = (char *) memchr(s, '\n', e - s))) ) {
64eff8b7
DM
2780 FmLINES(PL_bodytarget)++;
2781 s++;
2782 }
2783 }
125b9982 2784 /* mg_set() has temporarily made sv non-magical */
284167a5 2785 if (TAINTING_get) {
125b9982
NT
2786 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2787 SvTAINTED_on(PL_bodytarget);
2788 else
2789 SvTAINTED_off(PL_bodytarget);
2790 }
748a9306 2791 break;
49460fe6 2792 case '\003': /* ^C */
f2338a2e 2793 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS
2794 break;
2795
79072805 2796 case '\004': /* ^D */
b4ab917c 2797#ifdef DEBUGGING
a9e2d2bf
DM
2798 {
2799 const char *s = SvPV_nolen_const(sv);
2800 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2801 if (DEBUG_x_TEST || DEBUG_B_TEST)
2802 dump_all_perl(!DEBUG_B_TEST);
2803 }
b4ab917c 2804#else
38ab35f8 2805 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2806#endif
79072805 2807 break;
28f23441 2808 case '\005': /* ^E */
d0063567 2809 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2810#ifdef VMS
38ab35f8 2811 set_vaxc_errno(SvIV(sv));
2abc681d 2812#elif defined(WIN32)
d0063567 2813 SetLastError( SvIV(sv) );
2abc681d 2814#elif defined(OS2)
38ab35f8 2815 os2_setsyserrno(SvIV(sv));
2abc681d 2816#else
d0063567 2817 /* will anyone ever use this? */
38ab35f8 2818 SETERRNO(SvIV(sv), 4);
22fae026 2819#endif
d0063567 2820 }
fd503f5c
DIM
2821 else if (strEQ(mg->mg_ptr + 1, "NCODING") && SvOK(sv))
2822 Perl_croak(aTHX_ "${^ENCODING} is no longer supported");
d0063567 2823 break;
79072805 2824 case '\006': /* ^F */
38ab35f8 2825 PL_maxsysfd = SvIV(sv);
79072805 2826 break;
a0d0e21e 2827 case '\010': /* ^H */
efa571ab
KW
2828 {
2829 U32 save_hints = PL_hints;
5d382c25 2830 PL_hints = SvUV(sv);
efa571ab
KW
2831
2832 /* If wasn't UTF-8, and now is, notify the parser */
2833 if ((PL_hints & HINT_UTF8) && ! (save_hints & HINT_UTF8)) {
2834 notify_parser_that_changed_to_utf8();
2835 }
2836 }
a0d0e21e 2837 break;
9d116dd7 2838 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2839 Safefree(PL_inplace);
bd61b366 2840 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2841 break;
d9bad346
FC
2842 case '\016': /* ^N */
2843 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2844 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2845 goto croakparen;
28f23441 2846 case '\017': /* ^O */
ac27b0f5 2847 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2848 Safefree(PL_osname);
bd61b366 2849 PL_osname = NULL;
3511154c
DM
2850 if (SvOK(sv)) {
2851 TAINT_PROPER("assigning to $^O");
2e0de35c 2852 PL_osname = savesvpv(sv);
3511154c 2853 }
ac27b0f5
NIS
2854 }
2855 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2856 STRLEN len;
2857 const char *const start = SvPV(sv, len);
b54fc2b6 2858 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2859 SV *tmp;
8b850bd5
NC
2860
2861
2862 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2863 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2864
2865 /* Opening for input is more common than opening for output, so
2866 ensure that hints for input are sooner on linked list. */
59cd0e26 2867 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2868 SvUTF8(sv))
2869 : newSVpvs_flags("", SvUTF8(sv));
2870 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2871 mg_set(tmp);
8b850bd5 2872
f747ebd6
Z
2873 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2874 SvUTF8(sv));
2875 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2876 mg_set(tmp);
ac27b0f5 2877 }
28f23441 2878 break;
79072805 2879 case '\020': /* ^P */
2fdbfb4d
AB
2880 PL_perldb = SvIV(sv);
2881 if (PL_perldb && !PL_DBsingle)
2882 init_debugger();
9b9e0be4 2883 break;
79072805 2884 case '\024': /* ^T */
88e89b8a 2885#ifdef BIG_TIME
6b88bc9c 2886 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2887#else
38ab35f8 2888 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2889#endif
79072805 2890 break;
e07ea26a
NC
2891 case '\025': /* ^UTF8CACHE */
2892 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2893 PL_utf8cache = (signed char) sv_2iv(sv);
2894 }
2895 break;
fde18df1 2896 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2897 if (*(mg->mg_ptr+1) == '\0') {
2898 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2899 i = SvIV(sv);
ac27b0f5 2900 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2901 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2902 }
599cee73 2903 }
0a378802 2904 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2905 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC
2906 if (!SvPOK(sv)) {
2907 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS
2908 break;
2909 }
f4fc7782 2910 {
b5477537 2911 STRLEN len, i;
d3a7d8c7 2912 int accumulate = 0 ;
f4fc7782 2913 int any_fatals = 0 ;
b83604b4 2914 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2915 for (i = 0 ; i < len ; ++i) {
2916 accumulate |= ptr[i] ;
2917 any_fatals |= (ptr[i] & 0xAA) ;
2918 }
4243c432
NC
2919 if (!accumulate) {
2920 if (!specialWARN(PL_compiling.cop_warnings))
2921 PerlMemShared_free(PL_compiling.cop_warnings);
2922 PL_compiling.cop_warnings = pWARN_NONE;
2923 }
3c3f8cd6
AB
2924 /* Yuck. I can't see how to abstract this: */
2925 else if (isWARN_on(
2926 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2927 WARN_ALL)
2928 && !any_fatals)
2929 {
2930 if (!specialWARN(PL_compiling.cop_warnings))
2931 PerlMemShared_free(PL_compiling.cop_warnings);
2932 PL_compiling.cop_warnings = pWARN_ALL;
2933 PL_dowarn |= G_WARN_ONCE ;
2934 }
d3a7d8c7 2935 else {
72dc9ed5
NC
2936 STRLEN len;
2937 const char *const p = SvPV_const(sv, len);
2938
2939 PL_compiling.cop_warnings
8ee4cf24 2940 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2941 p, len);
2942
d3a7d8c7
GS
2943 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2944 PL_dowarn |= G_WARN_ONCE ;
2945 }
f4fc7782 2946
d3a7d8c7 2947 }
4438c4b7 2948 }
971a9dd3 2949 }
8ca2a5d6
DD
2950#ifdef WIN32
2951 else if (strEQ(mg->mg_ptr+1, "IN32_SLOPPY_STAT")) {
2952 w32_sloppystat = (bool)sv_true(sv);
2953 }
2954#endif
79072805
LW
2955 break;
2956 case '.':
3280af22
NIS
2957 if (PL_localizing) {
2958 if (PL_localizing == 1)
7766f137 2959 SAVESPTR(PL_last_in_gv);
748a9306 2960 }
3280af22 2961 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2962 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2963 break;
2964 case '^':
acbe1b9d 2965 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2966 IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2967 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2968 break;
2969 case '~':
acbe1b9d 2970 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
a9e2d2bf 2971 IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
acbe1b9d 2972 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2973 break;
2974 case '=':
acbe1b9d 2975 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2976 break;
2977 case '-':
acbe1b9d
FC
2978 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2979 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2980 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2981 break;
2982 case '%':
acbe1b9d 2983 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2984 break;
2985 case '|':
4b65379b 2986 {
099be4f1 2987 IO * const io = GvIO(PL_defoutgv);
720f287d
AB
2988 if(!io)
2989 break;
38ab35f8 2990 if ((SvIV(sv)) == 0)
4b65379b
CS
2991 IoFLAGS(io) &= ~IOf_FLUSH;
2992 else {
2993 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2994 PerlIO *ofp = IoOFP(io);
2995 if (ofp)
2996 (void)PerlIO_flush(ofp);
2997 IoFLAGS(io) |= IOf_FLUSH;
2998 }
2999 }
79072805
LW
3000 }
3001 break;
79072805 3002 case '/':
1ab48e3a 3003 {
1ab48e3a 3004 if (SvROK(sv)) {
8d37cdf7
DIM
3005 SV *referent = SvRV(sv);
3006 const char *reftype = sv_reftype(referent, 0);
d239bea0
A
3007 /* XXX: dodgy type check: This leaves me feeling dirty, but
3008 * the alternative is to copy pretty much the entire
3009 * sv_reftype() into this routine, or to do a full string
3010 * comparison on the return of sv_reftype() both of which
3011 * make me feel worse! NOTE, do not modify this comment
3012 * without reviewing the corresponding comment in
3013 * sv_reftype(). - Yves */
1ab48e3a 3014 if (reftype[0] == 'S' || reftype[0] == 'L') {
8d37cdf7 3015 IV val = SvIV(referent);
1ab48e3a 3016 if (val <= 0) {
520b6fb6
DIM
3017 sv_setsv(sv, PL_rs);
3018 Perl_croak(aTHX_ "Setting $/ to a reference to %s is forbidden",
3019 val < 0 ? "a negative integer" : "zero");
1ab48e3a
YO
3020 }
3021 } else {
ddce084a 3022 sv_setsv(sv, PL_rs);
8d37cdf7 3023 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC
3024 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
3025 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO
3026 }
3027 }
b3a2acfa 3028 SvREFCNT_dec(PL_rs);
520b6fb6 3029 PL_rs = newSVsv(sv);
b3a2acfa 3030 }
79072805
LW
3031 break;
3032 case '\\':
ef8d46e8 3033 SvREFCNT_dec(PL_ors_sv);
6bc2995b 3034 if (SvOK(sv)) {
7889fe52 3035 PL_ors_sv = newSVsv(sv);
009c130f 3036 }
e3c19b7b 3037 else {
a0714e2c 3038 PL_ors_sv = NULL;
e3c19b7b 3039 }
79072805 3040 break;
7d69d4a6
FC
3041 case '[':
3042 if (SvIV(sv) != 0)
3043 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
3044 break;
79072805 3045 case '?':
ff0cee69 3046#ifdef COMPLEX_STATUS
6b88bc9c 3047 if (PL_localizing == 2) {
41cb7b2b 3048 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
3049 PL_statusvalue = LvTARGOFF(sv);
3050 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
3051 }
3052 else
3053#endif
3054#ifdef VMSISH_STATUS
3055 if (VMSISH_STATUS)
fb38d079 3056 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
3057 else
3058#endif
38ab35f8 3059 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
3060 break;
3061 case '!':
93189314
JH
3062 {
3063#ifdef VMS
3064# define PERL_VMS_BANG vaxc$errno
3065#else
3066# define PERL_VMS_BANG 0
3067#endif
27329181 3068#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH
3069 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
3070 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
3071#else
91487cfc 3072 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 3073 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 3074#endif
93189314 3075 }
79072805
LW
3076 break;
3077 case '<':
985213f2 3078 {
b469f1e0 3079 /* XXX $< currently silently ignores failures */
dfff4baf 3080 const Uid_t new_uid = SvUID(sv);
985213f2 3081 PL_delaymagic_uid = new_uid;
3280af22
NIS
3082 if (PL_delaymagic) {
3083 PL_delaymagic |= DM_RUID;
79072805
LW
3084 break; /* don't do magic till later */
3085 }
3086#ifdef HAS_SETRUID
b469f1e0 3087 PERL_UNUSED_RESULT(setruid(new_uid));
2abc681d 3088#elif defined(HAS_SETREUID)
b469f1e0 3089 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
2abc681d 3090#elif defined(HAS_SETRESUID)
b469f1e0 3091 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 3092#else
985213f2 3093 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
2abc681d 3094# ifdef PERL_DARWIN
75870ed3 3095 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 3096 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 3097 PERL_UNUSED_RESULT(PerlProc_setuid(0));
2abc681d 3098# endif
b469f1e0 3099 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 3100 } else {
cea2e8a9 3101 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 3102 }
79072805 3103#endif
79072805 3104 break;
985213f2 3105 }
79072805 3106 case '>':
985213f2 3107 {
b469f1e0 3108 /* XXX $> currently silently ignores failures */
dfff4baf 3109 const Uid_t new_euid = SvUID(sv);
985213f2 3110 PL_delaymagic_euid = new_euid;
3280af22
NIS
3111 if (PL_delaymagic) {
3112 PL_delaymagic |= DM_EUID;
79072805
LW
3113 break; /* don't do magic till later */
3114 }
3115#ifdef HAS_SETEUID
b469f1e0 3116 PERL_UNUSED_RESULT(seteuid(new_euid));
2abc681d 3117#elif defined(HAS_SETREUID)
b469f1e0 3118 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
2abc681d 3119#elif defined(HAS_SETRESUID)
b469f1e0 3120 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 3121#else
985213f2 3122 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 3123 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 3124 else {
cea2e8a9 3125 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 3126 }
79072805 3127#endif
79072805 3128 break;
985213f2 3129 }
79072805 3130 case '(':
985213f2 3131 {
b469f1e0 3132 /* XXX $( currently silently ignores failures */
dfff4baf 3133 const Gid_t new_gid = SvGID(sv);
985213f2 3134 PL_delaymagic_gid = new_gid;
3280af22
NIS
3135 if (PL_delaymagic) {
3136 PL_delaymagic |= DM_RGID;
79072805
LW
3137 break; /* don't do magic till later */
3138 }
3139#ifdef HAS_SETRGID
b469f1e0 3140 PERL_UNUSED_RESULT(setrgid(new_gid));
2abc681d 3141#elif defined(HAS_SETREGID)
b469f1e0 3142 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
2abc681d 3143#elif defined(HAS_SETRESGID)
b469f1e0 3144 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3145#else
985213f2 3146 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3147 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3148 else {
cea2e8a9 3149 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3150 }
79072805 3151#endif
79072805 3152 break;
985213f2 3153 }
79072805 3154 case ')':
985213f2 3155 {
0635704a
HS
3156/* (hv) best guess: maybe we'll need configure probes to do a better job,
3157 * but you can override it if you need to.
3158 */
3159#ifndef INVALID_GID
3160#define INVALID_GID ((Gid_t)-1)
3161#endif
b469f1e0 3162 /* XXX $) currently silently ignores failures */
dfff4baf 3163 Gid_t new_egid;
5cd24f17
PP
3164#ifdef HAS_SETGROUPS
3165 {
b83604b4 3166 const char *p = SvPV_const(sv, len);
757f63d8 3167 Groups_t *gary = NULL;
fdadaf77 3168 const char* endptr;
22ff3130 3169 UV uv;
fb4089e0 3170#ifdef _SC_NGROUPS_MAX
3171 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3172
3173 if (maxgrp < 0)
3174 maxgrp = NGROUPS;
3175#else
3176 int maxgrp = NGROUPS;
3177#endif
757f63d8
SP
3178
3179 while (isSPACE(*p))
3180 ++p;
22ff3130
HS
3181 if (grok_atoUV(p, &uv, &endptr))
3182 new_egid = (Gid_t)uv;
3183 else {
0635704a 3184 new_egid = INVALID_GID;
22ff3130
HS
3185 endptr = NULL;
3186 }
fb4089e0 3187 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH
3188 if (endptr == NULL)
3189 break;
3190 p = endptr;
757f63d8
SP
3191 while (isSPACE(*p))
3192 ++p;
3193 if (!*p)
3194 break;
fdadaf77 3195 if (!gary)
757f63d8
SP
3196 Newx(gary, i + 1, Groups_t);
3197 else
3198 Renew(gary, i + 1, Groups_t);
22ff3130
HS
3199 if (grok_atoUV(p, &uv, &endptr))
3200 gary[i] = (Groups_t)uv;
3201 else {
0635704a 3202 gary[i] = INVALID_GID;
22ff3130
HS
3203 endptr = NULL;
3204 }
757f63d8
SP
3205 }
3206 if (i)
b469f1e0 3207 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3208 Safefree(gary);
5cd24f17
PP
3209 }
3210#else /* HAS_SETGROUPS */
dfff4baf 3211 new_egid = SvGID(sv);
5cd24f17 3212#endif /* HAS_SETGROUPS */
985213f2 3213 PL_delaymagic_egid = new_egid;
3280af22
NIS
3214 if (PL_delaymagic) {
3215 PL_delaymagic |= DM_EGID;
79072805
LW
3216 break; /* don't do magic till later */
3217 }
3218#ifdef HAS_SETEGID
b469f1e0 3219 PERL_UNUSED_RESULT(setegid(new_egid));
2abc681d 3220#elif defined(HAS_SETREGID)
b469f1e0 3221 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
2abc681d 3222#elif defined(HAS_SETRESGID)
b469f1e0 3223 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3224#else
985213f2 3225 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3226 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3227 else {
cea2e8a9 3228 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3229 }
79072805 3230#endif
79072805 3231 break;
985213f2 3232 }
79072805 3233 case ':':
2d8e6c8d 3234 PL_chopset = SvPV_force(sv,len);
79072805 3235 break;
9cdac2a2
FC
3236 case '$': /* $$ */
3237 /* Store the pid in mg->mg_obj so we can tell when a fork has
3238 occurred. mg->mg_obj points to *$ by default, so clear it. */
3239 if (isGV(mg->mg_obj)) {
3240 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3241 SvREFCNT_dec(mg->mg_obj);
3242 mg->mg_flags |= MGf_REFCOUNTED;
3243 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3244 }
3245 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3246 break;
79072805 3247 case '0':
e2975953 3248 LOCK_DOLLARZERO_MUTEX;
f1540bed 3249 S_set_dollarzero(aTHX_ sv);
e2975953 3250 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
3251 break;
3252 }
3253 return 0;
3254}
3255
3256I32
84c7b88c
BF
3257Perl_whichsig_sv(pTHX_ SV *sigsv)
3258{
3259 const char *sigpv;
3260 STRLEN siglen;
3261 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF
3262 sigpv = SvPV_const(sigsv, siglen);
3263 return whichsig_pvn(sigpv, siglen);
3264}
3265
3266I32
3267Perl_whichsig_pv(pTHX_ const char *sig)
3268{
3269 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF
3270 return whichsig_pvn(sig, strlen(sig));
3271}
3272
3273I32
3274Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3275{
eb578fdb 3276 char* const* sigv;
7918f24d 3277
84c7b88c 3278 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3279 PERL_UNUSED_CONTEXT;
79072805 3280
aadb217d 3281 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3282 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3283 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3284#ifdef SIGCLD
84c7b88c 3285 if (memEQs(sig, len, "CHLD"))
79072805
LW
3286 return SIGCLD;
3287#endif
3288#ifdef SIGCHLD
84c7b88c 3289 if (memEQs(sig, len, "CLD"))
79072805
LW
3290 return SIGCHLD;
3291#endif
7f1236c0 3292 return -1;
79072805
LW
3293}
3294
ecfc5424 3295Signal_t
1e82f5a6 3296#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3297Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH
3298#else
3299Perl_sighandler(int sig)
3300#endif
79072805 3301{
1018e26f
NIS
3302#ifdef PERL_GET_SIG_CONTEXT
3303 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3304#else
cea2e8a9 3305 dTHX;
71d280e3 3306#endif
79072805 3307 dSP;
a0714e2c
SS
3308 GV *gv = NULL;
3309 SV *sv = NULL;
8772537c 3310 SV * const tSv = PL_Sv;
601f1833 3311 CV *cv = NULL;
533c011a 3312 OP *myop = PL_op;
84902520 3313 U32 flags = 0;
8772537c 3314 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3315 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3316 SV *errsv_save = NULL;
71d280e3 3317
84902520 3318
727405f8 3319 if (!PL_psig_ptr[sig]) {
99ef548b 3320 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
3321 PL_sig_name[sig]);
3322 exit(sig);
3323 }
ff0cee69 3324
a0d63a7b
DM
3325 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3326 /* Max number of items pushed there is 3*n or 4. We cannot fix
3327 infinity, so we fix 4 (in fact 5): */
3328 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3329 flags |= 1;
3330 PL_savestack_ix += 5; /* Protect save in progress. */
3331 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3332 }
84902520 3333 }
84902520 3334 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3335 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
3336 || SvTYPE(cv) != SVt_PVCV) {
3337 HV *st;
f2c0649b 3338 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3339 }
84902520 3340
a0d0e21e 3341 if (!cv || !CvROOT(cv)) {
07c325bb 3342 const HEK * const hek = gv
1d6bb9ae
FC
3343 ? GvENAME_HEK(gv)
3344 : cv && CvNAMED(cv)
3345 ? CvNAME_HEK(cv)
07c325bb
FC
3346 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3347 if (hek)
3348 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
147e3846 3349 "SIG%s handler \"%" HEKf "\" not defined.\n",
ac892e4a 3350 PL_sig_name[sig], HEKfARG(hek));
07c325bb
FC
3351 /* diag_listed_as: SIG%s handler "%s" not defined */
3352 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3353 "SIG%s handler \"__ANON__\" not defined.\n",
3354 PL_sig_name[sig]);
00d579c5 3355 goto cleanup;
79072805
LW
3356 }
3357
0c4d3b5e
DM
3358 sv = PL_psig_name[sig]
3359 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3360 : newSVpv(PL_sig_name[sig],0);
72048cfe 3361 flags |= 8;
0c4d3b5e
DM
3362 SAVEFREESV(sv);
3363
a0d63a7b
DM
3364 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3365 /* make sure our assumption about the size of the SAVEs are correct:
3366 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3367 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3368 }
e336de0d 3369
e788e7d3 3370 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3371 PUSHMARK(SP);
79072805 3372 PUSHs(sv);
8aad04aa
JH
3373#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3374 {
3375 struct sigaction oact;
3376
3377 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
3378 if (sip) {
3379 HV *sih = newHV();
ad64d0ec 3380 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
3381 /* The siginfo fields signo, code, errno, pid, uid,
3382 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
3383 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3384 (void)hv_stores(sih, "code", newSViv(sip->si_code));
cdfe2e65
DIM
3385#ifdef HAS_SIGINFO_SI_ERRNO
3386 (void)hv_stores(sih, "errno", newSViv(sip->si_errno));
3387#endif
3388#ifdef HAS_SIGINFO_SI_STATUS
3389 (void)hv_stores(sih, "status", newSViv(sip->si_status));
3390#endif
3391#ifdef HAS_SIGINFO_SI_UID
3392 {
3393 SV *uid = newSV(0);
3394 sv_setuid(uid, sip->si_uid);
3395 (void)hv_stores(sih, "uid", uid);
3396 }
3397#endif
3398#ifdef HAS_SIGINFO_SI_PID
3399 (void)hv_stores(sih, "pid", newSViv(sip->si_pid));
3400#endif
3401#ifdef HAS_SIGINFO_SI_ADDR
3402 (void)hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3403#endif
3404#ifdef HAS_SIGINFO_SI_BAND
3405 (void)hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3406#endif
8aad04aa 3407 EXTEND(SP, 2);
ad64d0ec 3408 PUSHs(rv);
22f1178f 3409 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3410 }
b4552a27 3411
8aad04aa
JH
3412 }
3413 }
3414#endif
79072805 3415 PUTBACK;
a0d0e21e 3416
100c03aa
JL
3417 errsv_save = newSVsv(ERRSV);
3418
ad64d0ec 3419 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3420
d3acc0f7 3421 POPSTACK;
eed484f9
DD
3422 {
3423 SV * const errsv = ERRSV;
3424 if (SvTRUE_NN(errsv)) {
3425 SvREFCNT_dec(errsv_save);
c22d665b 3426#ifndef PERL_MICRO
1b266415
NIS
3427 /* Handler "died", for example to get out of a restart-able read().
3428 * Before we re-do that on its behalf re-enable the signal which was
3429 * blocked by the system when we entered.
3430 */
c22d665b 3431#ifdef HAS_SIGPROCMASK
d488af49 3432#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3433 if (sip || uap)
c22d665b 3434#endif
eed484f9
DD
3435 {
3436 sigset_t set;
3437 sigemptyset(&set);
3438 sigaddset(&set,sig);
3439 sigprocmask(SIG_UNBLOCK, &set, NULL);
3440 }
c22d665b 3441#else
eed484f9
DD
3442 /* Not clear if this will work */
3443 (void)rsignal(sig, SIG_IGN);
3444 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT
3445#endif
3446#endif /* !PERL_MICRO */
eed484f9
DD
3447 die_sv(errsv);
3448 }
3449 else {
3450 sv_setsv(errsv, errsv_save);
3451 SvREFCNT_dec(errsv_save);
3452 }
100c03aa
JL
3453 }
3454
7b52d656 3455 cleanup:
0c4d3b5e
DM
3456 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3457 PL_savestack_ix = old_ss_ix;
72048cfe 3458 if (flags & 8)
2357bae7 3459 SvREFCNT_dec_NN(sv);
533c011a 3460 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3461
3280af22
NIS
3462 PL_Sv = tSv; /* Restore global temporaries. */
3463 PL_Xpv = tXpv;
53bb94e2 3464 return;
79072805 3465}
4e35701f
NIS
3466
3467
51371543 3468static void
8772537c 3469S_restore_magic(pTHX_ const void *p)
51371543 3470{
8772537c
AL
3471 MGS* const mgs = SSPT