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op.c:newMETHOP: Remove op_next check
[perl5.git] / mg.c
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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 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 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
130Turns on the magical status of an SV. See C<sv_magic>.
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
72d33970 163be >= SVt_PVMG. See C<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;
ff76feab 174 MAGIC *newmg, *head, *cur, *mg;
6683b158 175
7918f24d
NC		 176 PERL_ARGS_ASSERT_MG_GET;
177
407287f9
FC		 178 if (PL_localizing == 1 && sv == DEFSV) return 0;
179
ff76feab
AMS		 180 /* We must call svt_get(sv, mg) for each valid entry in the linked
181 list of magic. svt_get() may delete the current entry, add new
182 magic to the head of the list, or upgrade the SV. AMS 20010810 */
183
184 newmg = cur = head = mg = SvMAGIC(sv);
185 while (mg) {
35a4481c 186 const MGVTBL * const vtbl = mg->mg_virtual;
f9c6fee5 187 MAGIC * const nextmg = mg->mg_moremagic; /* it may delete itself */
ff76feab 188
2b260de0 189 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
a9844598
CS		 190
191 /* taint's mg get is so dumb it doesn't need flag saving */
192 if (!saved && mg->mg_type != PERL_MAGIC_taint) {
193 save_magic(mgs_ix, sv);
194 saved = TRUE;
195 }
196
16c91539 197 vtbl->svt_get(aTHX_ sv, mg);
b77f7d40 198
58f82c5c
DM		 199 /* guard against magic having been deleted - eg FETCH calling
200 * untie */
f9c6fee5 201 if (!SvMAGIC(sv)) {
a623f893
FC		 202 /* recalculate flags */
203 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
58f82c5c 204 break;
f9c6fee5 205 }
b77f7d40 206
f9c6fee5 207 /* recalculate flags if this entry was deleted. */
ff76feab 208 if (mg->mg_flags & MGf_GSKIP)
a623f893
FC		 209 (SSPTR(mgs_ix, MGS *))->mgs_flags &=
210 ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 211 }
7d1328bb
FC		 212 else if (vtbl == &PL_vtbl_utf8) {
213 /* get-magic can reallocate the PV */
214 magic_setutf8(sv, mg);
215 }
ff76feab 216
f9c6fee5 217 mg = nextmg;
ff76feab 218
0723351e 219 if (have_new) {
ff76feab
AMS		 220 /* Have we finished with the new entries we saw? Start again
221 where we left off (unless there are more new entries). */
222 if (mg == head) {
0723351e 223 have_new = 0;
ff76feab
AMS		 224 mg = cur;
225 head = newmg;
226 }
227 }
228
229 /* Were any new entries added? */
0723351e
NC		 230 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
231 have_new = 1;
ff76feab
AMS		 232 cur = mg;
233 mg = newmg;
a623f893
FC		 234 /* recalculate flags */
235 (SSPTR(mgs_ix, MGS *))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
760ac839 236 }
79072805 237 }
463ee0b2 238
a9844598
CS		 239 if (saved)
240 restore_magic(INT2PTR(void *, (IV)mgs_ix));
241
79072805
LW		 242 return 0;
243}
244
954c1994
GS		 245/*
246=for apidoc mg_set
247
248Do magic after a value is assigned to the SV. See C<sv_magic>.
249
250=cut
251*/
252
79072805 253int
864dbfa3 254Perl_mg_set(pTHX_ SV *sv)
79072805 255{
35a4481c 256 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 257 MAGIC* mg;
463ee0b2
LW		 258 MAGIC* nextmg;
259
7918f24d
NC		 260 PERL_ARGS_ASSERT_MG_SET;
261
b5ed8c44
FC		 262 if (PL_localizing == 2 && sv == DEFSV) return 0;
263
ff44333e 264 save_magic_flags(mgs_ix, sv, SVs_GMG|SVs_SMG); /* leave SVs_RMG on */
463ee0b2
LW		 265
266 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 267 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 268 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW		 269 if (mg->mg_flags & MGf_GSKIP) {
270 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
a623f893 271 (SSPTR(mgs_ix, MGS*))->mgs_flags &= ~(SVs_GMG|SVs_SMG|SVs_RMG);
a0d0e21e 272 }
e0a73de4 273 if (PL_localizing == 2
b5ed8c44 274 && PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
e7cbf6c6 275 continue;
2b260de0 276 if (vtbl && vtbl->svt_set)
16c91539 277 vtbl->svt_set(aTHX_ sv, mg);
79072805 278 }
463ee0b2 279
8772537c 280 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW		 281 return 0;
282}
283
954c1994
GS		 284/*
285=for apidoc mg_length
286
d4e99c76 287Reports on the SV's length in bytes, calling length magic if available,
bd8446cf
FC		 288but does not set the UTF8 flag on the sv. It will fall back to 'get'
289magic if there is no 'length' magic, but with no indication as to
290whether it called 'get' magic. It assumes the sv is a PVMG or
291higher. Use sv_len() instead.
954c1994
GS		 292
293=cut
294*/
295
79072805 296U32
864dbfa3 297Perl_mg_length(pTHX_ SV *sv)
79072805
LW		 298{
299 MAGIC* mg;
463ee0b2 300 STRLEN len;
463ee0b2 301
7918f24d
NC		 302 PERL_ARGS_ASSERT_MG_LENGTH;
303
79072805 304 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 305 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 306 if (vtbl && vtbl->svt_len) {
35a4481c 307 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 308 save_magic(mgs_ix, sv);
a0d0e21e 309 /* omit MGf_GSKIP -- not changed here */
16c91539 310 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 311 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW		 312 return len;
313 }
314 }
315
bd8446cf 316 (void)SvPV_const(sv, len);
463ee0b2 317 return len;
79072805
LW		 318}
319
8fb26106 320I32
864dbfa3 321Perl_mg_size(pTHX_ SV *sv)
93965878
NIS		 322{
323 MAGIC* mg;
ac27b0f5 324
7918f24d
NC		 325 PERL_ARGS_ASSERT_MG_SIZE;
326
93965878 327 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 328 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 329 if (vtbl && vtbl->svt_len) {
35a4481c
AL		 330 const I32 mgs_ix = SSNEW(sizeof(MGS));
331 I32 len;
455ece5e 332 save_magic(mgs_ix, sv);
93965878 333 /* omit MGf_GSKIP -- not changed here */
16c91539 334 len = vtbl->svt_len(aTHX_ sv, mg);
8772537c 335 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS		 336 return len;
337 }
338 }
339
340 switch(SvTYPE(sv)) {
341 case SVt_PVAV:
502c6561 342 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS		 343 case SVt_PVHV:
344 /* FIXME */
345 default:
cea2e8a9 346 Perl_croak(aTHX_ "Size magic not implemented");
81d52ecd 347
93965878 348 }
a25b5927 349 NOT_REACHED; /* NOTREACHED */
93965878
NIS		 350}
351
954c1994
GS		 352/*
353=for apidoc mg_clear
354
355Clear something magical that the SV represents. See C<sv_magic>.
356
357=cut
358*/
359
79072805 360int
864dbfa3 361Perl_mg_clear(pTHX_ SV *sv)
79072805 362{
35a4481c 363 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 364 MAGIC* mg;
8ac77ac9 365 MAGIC *nextmg;
463ee0b2 366
7918f24d
NC		 367 PERL_ARGS_ASSERT_MG_CLEAR;
368
455ece5e 369 save_magic(mgs_ix, sv);
463ee0b2 370
8ac77ac9 371 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 372 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 373 /* omit GSKIP -- never set here */
727405f8 374
8ac77ac9
NC		 375 nextmg = mg->mg_moremagic; /* it may delete itself */
376
2b260de0 377 if (vtbl && vtbl->svt_clear)
16c91539 378 vtbl->svt_clear(aTHX_ sv, mg);
79072805 379 }
463ee0b2 380
8772537c 381 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW		 382 return 0;
383}
384
ed624ca8 385static MAGIC*
ddeaf645 386S_mg_findext_flags(const SV *sv, int type, const MGVTBL *vtbl, U32 flags)
39de7f53 387{
39de7f53
FR		 388 assert(flags <= 1);
389
390 if (sv) {
391 MAGIC *mg;
392
393 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
394 if (mg->mg_type == type && (!flags || mg->mg_virtual == vtbl)) {
395 return mg;
396 }
397 }
398 }
399
400 return NULL;
401}
402
954c1994
GS		 403/*
404=for apidoc mg_find
405
406Finds the magic pointer for type matching the SV. See C<sv_magic>.
407
408=cut
409*/
410
93a17b20 411MAGIC*
ddeaf645 412Perl_mg_find(const SV *sv, int type)
93a17b20 413{
ddeaf645 414 return S_mg_findext_flags(sv, type, NULL, 0);
39de7f53
FR		 415}
416
417/*
418=for apidoc mg_findext
419
420Finds the magic pointer of C<type> with the given C<vtbl> for the C<SV>. See
421C<sv_magicext>.
422
423=cut
424*/
425
426MAGIC*
ddeaf645 427Perl_mg_findext(const SV *sv, int type, const MGVTBL *vtbl)
39de7f53 428{
ddeaf645 429 return S_mg_findext_flags(sv, type, vtbl, 1);
93a17b20
LW		 430}
431
96c2a8ff
FC		 432MAGIC *
433Perl_mg_find_mglob(pTHX_ SV *sv)
434{
435 PERL_ARGS_ASSERT_MG_FIND_MGLOB;
436 if (SvTYPE(sv) == SVt_PVLV && LvTYPE(sv) == 'y') {
437 /* This sv is only a delegate. //g magic must be attached to
438 its target. */
439 vivify_defelem(sv);
440 sv = LvTARG(sv);
441 }
442 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
ddeaf645 443 return S_mg_findext_flags(sv, PERL_MAGIC_regex_global, 0, 0);
96c2a8ff
FC		 444 return NULL;
445}
446
954c1994
GS		 447/*
448=for apidoc mg_copy
449
450Copies the magic from one SV to another. See C<sv_magic>.
451
452=cut
453*/
454
79072805 455int
864dbfa3 456Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 457{
463ee0b2 458 int count = 0;
79072805 459 MAGIC* mg;
7918f24d
NC		 460
461 PERL_ARGS_ASSERT_MG_COPY;
462
463ee0b2 463 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 464 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93 465 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
16c91539 466 count += vtbl->svt_copy(aTHX_ sv, mg, nsv, key, klen);
68795e93 467 }
823a54a3
AL		 468 else {
469 const char type = mg->mg_type;
1e73acc8 470 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL		 471 sv_magic(nsv,
472 (type == PERL_MAGIC_tied)
473 ? SvTIED_obj(sv, mg)
474 : (type == PERL_MAGIC_regdata && mg->mg_obj)
475 ? sv
476 : mg->mg_obj,
477 toLOWER(type), key, klen);
478 count++;
479 }
79072805 480 }
79072805 481 }
463ee0b2 482 return count;
79072805
LW		 483}
484
954c1994 485/*
0cbee0a4
DM		 486=for apidoc mg_localize
487
9711599e 488Copy some of the magic from an existing SV to new localized version of that
154e47c8
FC		 489SV. Container magic (eg %ENV, $1, tie)
490gets copied, value magic doesn't (eg
9711599e
CS		 491taint, pos).
492
af7df257 493If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS		 494This typically means that assignment will soon follow (e.g. 'local $x = $y'),
495and that will handle the magic.
0cbee0a4
DM		 496
497=cut
498*/
499
500void
af7df257 501Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4
DM		 502{
503 MAGIC *mg;
7918f24d
NC		 504
505 PERL_ARGS_ASSERT_MG_LOCALIZE;
506
658a9f31
JD		 507 if (nsv == DEFSV)
508 return;
509
0cbee0a4 510 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 511 const MGVTBL* const vtbl = mg->mg_virtual;
e0a73de4 512 if (PERL_MAGIC_TYPE_IS_VALUE_MAGIC(mg->mg_type))
0cbee0a4 513 continue;
0cbee0a4 514
a5063e7c 515 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
16c91539 516 (void)vtbl->svt_local(aTHX_ nsv, mg);
a5063e7c 517 else
0cbee0a4
DM		 518 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
519 mg->mg_ptr, mg->mg_len);
a5063e7c 520
0cbee0a4 521 /* container types should remain read-only across localization */
9ff3e6d8 522 SvFLAGS(nsv) |= SvREADONLY(sv);
0cbee0a4
DM		 523 }
524
525 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
526 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 527 if (setmagic) {
9711599e
CS		 528 PL_localizing = 1;
529 SvSETMAGIC(nsv);
530 PL_localizing = 0;
531 }
0cbee0a4
DM		 532 }
533}
534
d9088386
Z		 535#define mg_free_struct(sv, mg) S_mg_free_struct(aTHX_ sv, mg)
536static void
537S_mg_free_struct(pTHX_ SV *sv, MAGIC *mg)
538{
539 const MGVTBL* const vtbl = mg->mg_virtual;
540 if (vtbl && vtbl->svt_free)
541 vtbl->svt_free(aTHX_ sv, mg);
542 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
543 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
544 Safefree(mg->mg_ptr);
545 else if (mg->mg_len == HEf_SVKEY)
546 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
547 }
548 if (mg->mg_flags & MGf_REFCOUNTED)
549 SvREFCNT_dec(mg->mg_obj);
550 Safefree(mg);
551}
552
0cbee0a4 553/*
954c1994
GS		 554=for apidoc mg_free
555
556Free any magic storage used by the SV. See C<sv_magic>.
557
558=cut
559*/
560
79072805 561int
864dbfa3 562Perl_mg_free(pTHX_ SV *sv)
79072805
LW		 563{
564 MAGIC* mg;
565 MAGIC* moremagic;
7918f24d
NC		 566
567 PERL_ARGS_ASSERT_MG_FREE;
568
79072805 569 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
79072805 570 moremagic = mg->mg_moremagic;
d9088386 571 mg_free_struct(sv, mg);
c826f41b 572 SvMAGIC_set(sv, moremagic);
79072805 573 }
b162af07 574 SvMAGIC_set(sv, NULL);
68f8932e 575 SvMAGICAL_off(sv);
79072805
LW		 576 return 0;
577}
578
d9088386
Z		 579/*
580=for apidoc Am|void|mg_free_type|SV *sv|int how
581
582Remove any magic of type I<how> from the SV I<sv>. See L</sv_magic>.
583
584=cut
585*/
586
587void
588Perl_mg_free_type(pTHX_ SV *sv, int how)
589{
590 MAGIC *mg, *prevmg, *moremg;
591 PERL_ARGS_ASSERT_MG_FREE_TYPE;
592 for (prevmg = NULL, mg = SvMAGIC(sv); mg; prevmg = mg, mg = moremg) {
593 MAGIC *newhead;
594 moremg = mg->mg_moremagic;
595 if (mg->mg_type == how) {
596 /* temporarily move to the head of the magic chain, in case
597 custom free code relies on this historical aspect of mg_free */
598 if (prevmg) {
599 prevmg->mg_moremagic = moremg;
600 mg->mg_moremagic = SvMAGIC(sv);
601 SvMAGIC_set(sv, mg);
602 }
603 newhead = mg->mg_moremagic;
604 mg_free_struct(sv, mg);
605 SvMAGIC_set(sv, newhead);
606 mg = prevmg;
607 }
608 }
609 mg_magical(sv);
610}
611
79072805 612#include <signal.h>
79072805 613
942e002e 614U32
864dbfa3 615Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 616{
8772537c 617 PERL_UNUSED_ARG(sv);
6cef1e77 618
7918f24d
NC		 619 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
620
0bd48802 621 if (PL_curpm) {
eb578fdb 622 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 623 if (rx) {
a678b0e4
YO		 624 if (mg->mg_obj) { /* @+ */
625 /* return the number possible */
07bc277f 626 return RX_NPARENS(rx);
a678b0e4 627 } else { /* @- */
07bc277f 628 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO		 629
630 /* return the last filled */
f46c4081 631 while ( paren >= 0
07bc277f
NC		 632 && (RX_OFFS(rx)[paren].start == -1
633 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 634 paren--;
a678b0e4
YO		 635 return (U32)paren;
636 }
0bd48802 637 }
8f580fb8 638 }
ac27b0f5 639
942e002e 640 return (U32)-1;
6cef1e77
IZ		 641}
642
6502e081
DM		 643/* @-, @+ */
644
6cef1e77 645int
864dbfa3 646Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 647{
7918f24d
NC		 648 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
649
0bd48802 650 if (PL_curpm) {
eb578fdb 651 const REGEXP * const rx = PM_GETRE(PL_curpm);
0bd48802 652 if (rx) {
eb578fdb 653 const I32 paren = mg->mg_len;
a10eae29
FC		 654 SSize_t s;
655 SSize_t t;
0bd48802
AL		 656 if (paren < 0)
657 return 0;
07bc277f
NC		 658 if (paren <= (I32)RX_NPARENS(rx) &&
659 (s = RX_OFFS(rx)[paren].start) != -1 &&
660 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802 661 {
a10eae29 662 SSize_t i;
0bd48802
AL		 663 if (mg->mg_obj) /* @+ */
664 i = t;
665 else /* @- */
666 i = s;
667
a10eae29 668 if (RX_MATCH_UTF8(rx)) {
07bc277f 669 const char * const b = RX_SUBBEG(rx);
0bd48802 670 if (b)
6502e081
DM		 671 i = RX_SUBCOFFSET(rx) +
672 utf8_length((U8*)b,
673 (U8*)(b-RX_SUBOFFSET(rx)+i));
0bd48802 674 }
727405f8 675
a10eae29 676 sv_setuv(sv, i);
232af1f8 677 return 0;
1aa99e6b 678 }
0bd48802 679 }
6cef1e77 680 }
232af1f8 681 sv_setsv(sv, NULL);
6cef1e77
IZ		 682 return 0;
683}
684
6502e081
DM		 685/* @-, @+ */
686
e4b89193 687int
a29d06ed
MG		 688Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
689{
7918f24d 690 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
dc3bf405 691 PERL_UNUSED_CONTEXT;
d4c19fe8
AL		 692 PERL_UNUSED_ARG(sv);
693 PERL_UNUSED_ARG(mg);
cb077ed2 694 Perl_croak_no_modify();
0dbb1585 695 NORETURN_FUNCTION_END;
a29d06ed
MG		 696}
697
ad3296c6 698#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA		 699 if (SvPOK(sv)) { \
700 STRLEN len = SvCUR(sv); \
701 char * const p = SvPVX(sv); \
8e6b4db6
PC		 702 while (len > 0 && isSPACE(p[len-1])) \
703 --len; \
704 SvCUR_set(sv, len); \
705 p[len] = '\0'; \
706 } \
ad3296c6
SH		 707} STMT_END
708
8b850bd5
NC		 709void
710Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
711{
7918f24d
NC		 712 PERL_ARGS_ASSERT_EMULATE_COP_IO;
713
8b850bd5
NC		 714 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
715 sv_setsv(sv, &PL_sv_undef);
716 else {
717 sv_setpvs(sv, "");
718 SvUTF8_off(sv);
719 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
20439bc7 720 SV *const value = cop_hints_fetch_pvs(c, "open<", 0);
8b850bd5
NC		 721 assert(value);
722 sv_catsv(sv, value);
723 }
724 sv_catpvs(sv, "\0");
725 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
20439bc7 726 SV *const value = cop_hints_fetch_pvs(c, "open>", 0);
8b850bd5
NC		 727 assert(value);
728 sv_catsv(sv, value);
729 }
730 }
731}
732
d9fe7d23
KW		 733STATIC void
734S_fixup_errno_string(pTHX_ SV* sv)
735{
736 /* Do what is necessary to fixup the non-empty string in 'sv' for return to
737 * Perl space. */
738
739 PERL_ARGS_ASSERT_FIXUP_ERRNO_STRING;
740
741 assert(SvOK(sv));
b35e4f8b
KW		 742
743 if(strEQ(SvPVX(sv), "")) {
744 sv_catpv(sv, UNKNOWN_ERRNO_MSG);
745 }
746 else {
d9fe7d23 747
d3c0b317
KW		 748 /* In some locales the error string may come back as UTF-8, in which
749 * case we should turn on that flag. This didn't use to happen, and to
5320b60d
KW		 750 * avoid as many possible backward compatibility issues as possible, we
751 * don't turn on the flag unless we have to. So the flag stays off for
9f10db87
KW		 752 * an entirely invariant string. We assume that if the string looks
753 * like UTF-8, it really is UTF-8: "text in any other encoding that
754 * uses bytes with the high bit set is extremely unlikely to pass a
755 * UTF-8 validity test"
756 * (http://en.wikipedia.org/wiki/Charset_detection). There is a
757 * potential that we will get it wrong however, especially on short
758 * error message text. (If it turns out to be necessary, we could also
759 * keep track if the current LC_MESSAGES locale is UTF-8) */
d3c0b317 760 if (! IN_BYTES /* respect 'use bytes' */
9f10db87 761 && ! is_invariant_string((U8*) SvPVX_const(sv), SvCUR(sv))
d3c0b317
KW		 762 && is_utf8_string((U8*) SvPVX_const(sv), SvCUR(sv)))
763 {
764 SvUTF8_on(sv);
765 }
b35e4f8b 766 }
d9fe7d23
KW		 767}
768
ad2de1b2
KW		 769SV*
770Perl__get_encoding(pTHX)
771{
3e669301
KW		 772 /* For core Perl use only: Returns the $^ENCODING or 'use encoding' in
773 * effect; NULL if none.
774 *
775 * $^ENCODING maps to PL_encoding, and is the old way to do things, and is
776 * retained for backwards compatibility. Now, there is a shadow variable
777 * ${^E_NCODING} set only by the encoding pragma, used to give this pragma
778 * lexical scope, unlike the global scope it (shudder) used to have. This
779 * variable maps to PL_lex_encoding. Again for backwards compatibility,
780 * PL_encoding has precedence over PL_lex_encoding. The hints hash is used
781 * to determine if PL_lex_encoding is in scope, and hence valid. The hints
782 * hash only accepts simple values, so we can't put an Encode object into
783 * it, so we put the object into the global, and put a simple boolean into
784 * the hints hash giving whether the global is valid or not */
785
c79dccf4 786 dVAR;
3e669301
KW		 787 SV *is_encoding;
788
789 if (PL_encoding) {
790 return PL_encoding;
791 }
792
793 if (! PL_lex_encoding) {
794 return NULL;
795 }
796
797 is_encoding = cop_hints_fetch_pvs(PL_curcop, "encoding", 0);
798 if ( is_encoding
799 && is_encoding != &PL_sv_placeholder
800 && SvIOK(is_encoding)
801 && SvIV(is_encoding)) /* non-zero mean valid */
802 {
803 return PL_lex_encoding;
804 }
ad2de1b2 805
3e669301 806 return NULL;
ad2de1b2
KW		 807}
808
25bbd826
CB		 809#ifdef VMS
810#include <descrip.h>
811#include <starlet.h>
812#endif
813
79072805 814int
864dbfa3 815Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 816{
eb578fdb
KW		 817 I32 paren;
818 const char *s = NULL;
819 REGEXP *rx;
823a54a3 820 const char * const remaining = mg->mg_ptr + 1;
e91d8259 821 char nextchar;
79072805 822
7918f24d
NC		 823 PERL_ARGS_ASSERT_MAGIC_GET;
824
e91d8259 825 if (!mg->mg_ptr) {
e91d8259 826 paren = mg->mg_len;
e91d8259 827 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
a6d0b1b5 828 do_numbuf_fetch:
e91d8259
NC		 829 CALLREG_NUMBUF_FETCH(rx,paren,sv);
830 } else {
831 sv_setsv(sv,&PL_sv_undef);
832 }
833 return 0;
834 }
835
836 nextchar = *remaining;
79072805 837 switch (*mg->mg_ptr) {
748a9306 838 case '\001': /* ^A */
f2da823f
FC		 839 if (SvOK(PL_bodytarget)) sv_copypv(sv, PL_bodytarget);
840 else sv_setsv(sv, &PL_sv_undef);
125b9982
NT		 841 if (SvTAINTED(PL_bodytarget))
842 SvTAINTED_on(sv);
748a9306 843 break;
e5218da5 844 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 845 if (nextchar == '\0') {
e5218da5
GA		 846 sv_setiv(sv, (IV)PL_minus_c);
847 }
823a54a3 848 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA		 849 sv_setiv(sv, (IV)STATUS_NATIVE);
850 }
49460fe6
NIS		 851 break;
852
79072805 853 case '\004': /* ^D */
aea4f609 854 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 855 break;
28f23441 856 case '\005': /* ^E */
6c6eab55
KW		 857 if (nextchar != '\0') {
858 if (strEQ(remaining, "NCODING"))
ad2de1b2 859 sv_setsv(sv, _get_encoding());
199670db
FC		 860 else if (strEQ(remaining, "_NCODING"))
861 sv_setsv(sv, NULL);
4f4ff3a7 862 break;
6c6eab55 863 }
4f4ff3a7
KW		 864
865#if defined(VMS) || defined(OS2) || defined(WIN32)
866# if defined(VMS)
2a99ff86
KW		 867 {
868 char msg[255];
869 $DESCRIPTOR(msgdsc,msg);
870 sv_setnv(sv,(NV) vaxc$errno);
871 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
872 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
873 else
874 sv_setpvs(sv,"");
875 }
4b645107 876#elif defined(OS2)
2a99ff86
KW		 877 if (!(_emx_env & 0x200)) { /* Under DOS */
878 sv_setnv(sv, (NV)errno);
2c6ee1a7 879 sv_setpv(sv, errno ? my_strerror(errno) : "");
2a99ff86
KW		 880 } else {
881 if (errno != errno_isOS2) {
882 const int tmp = _syserrno();
883 if (tmp) /* 2nd call to _syserrno() makes it 0 */
884 Perl_rc = tmp;
885 }
886 sv_setnv(sv, (NV)Perl_rc);
887 sv_setpv(sv, os2error(Perl_rc));
888 }
1534c6f5 889 if (SvOK(sv) && strNE(SvPVX(sv), "")) {
99461a73
KW		 890 fixup_errno_string(sv);
891 }
4f4ff3a7 892# elif defined(WIN32)
2a99ff86
KW		 893 {
894 const DWORD dwErr = GetLastError();
895 sv_setnv(sv, (NV)dwErr);
896 if (dwErr) {
897 PerlProc_GetOSError(sv, dwErr);
2efab60d 898 fixup_errno_string(sv);
2a99ff86
KW		 899 }
900 else
901 sv_setpvs(sv, "");
902 SetLastError(dwErr);
903 }
4f4ff3a7
KW		 904# else
905# error Missing code for platform
906# endif
2a99ff86
KW		 907 SvRTRIM(sv);
908 SvNOK_on(sv); /* what a wonderful hack! */
909 break;
4f4ff3a7
KW		 910#endif /* End of platforms with special handling for $^E; others just fall
911 through to $! */
46f3e16c
KW		 912
913 case '!':
914 {
5f1b979d 915 dSAVE_ERRNO;
46f3e16c 916#ifdef VMS
5f1b979d 917 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
46f3e16c 918#else
5f1b979d 919 sv_setnv(sv, (NV)errno);
46f3e16c
KW		 920#endif
921#ifdef OS2
5f1b979d
KW		 922 if (errno == errno_isOS2 || errno == errno_isOS2_set)
923 sv_setpv(sv, os2error(Perl_rc));
924 else
46f3e16c 925#endif
5f1b979d
KW		 926 if (! errno) {
927 sv_setpvs(sv, "");
46f3e16c 928 }
5f1b979d
KW		 929 else {
930
931 /* Strerror can return NULL on some platforms, which will
932 * result in 'sv' not being considered SvOK. The SvNOK_on()
933 * below will cause just the number part to be valid */
2c6ee1a7 934 sv_setpv(sv, my_strerror(errno));
5f1b979d
KW		 935 if (SvOK(sv)) {
936 fixup_errno_string(sv);
937 }
938 }
939 RESTORE_ERRNO;
46f3e16c
KW		 940 }
941
942 SvRTRIM(sv);
943 SvNOK_on(sv); /* what a wonderful hack! */
944 break;
945
79072805 946 case '\006': /* ^F */
3280af22 947 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 948 break;
9ebf26ad
FR		 949 case '\007': /* ^GLOBAL_PHASE */
950 if (strEQ(remaining, "LOBAL_PHASE")) {
951 sv_setpvn(sv, PL_phase_names[PL_phase],
952 strlen(PL_phase_names[PL_phase]));
953 }
954 break;
a0d0e21e 955 case '\010': /* ^H */
3280af22 956 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 957 break;
9d116dd7 958 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 959 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 960 break;
8561ea1d
FC		 961 case '\014': /* ^LAST_FH */
962 if (strEQ(remaining, "AST_FH")) {
963 if (PL_last_in_gv) {
964 assert(isGV_with_GP(PL_last_in_gv));
965 SV_CHECK_THINKFIRST_COW_DROP(sv);
966 prepare_SV_for_RV(sv);
967 SvOK_off(sv);
968 SvRV_set(sv, SvREFCNT_inc_simple_NN(PL_last_in_gv));
969 SvROK_on(sv);
970 sv_rvweaken(sv);
971 }
972 else sv_setsv_nomg(sv, NULL);
973 }
974 break;
ac27b0f5 975 case '\017': /* ^O & ^OPEN */
823a54a3 976 if (nextchar == '\0') {
ac27b0f5 977 sv_setpv(sv, PL_osname);
3511154c
DM		 978 SvTAINTED_off(sv);
979 }
823a54a3 980 else if (strEQ(remaining, "PEN")) {
8b850bd5 981 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 982 }
28f23441 983 break;
9ebf26ad 984 case '\020':
a6d0b1b5 985 sv_setiv(sv, (IV)PL_perldb);
79072805 986 break;
fb73857a 987 case '\023': /* ^S */
a6d0b1b5 988 {
bc177e6b 989 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 990 SvOK_off(sv);
3280af22 991 else if (PL_in_eval)
6dc8a9e4 992 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS		 993 else
994 sv_setiv(sv, 0);
d58bf5aa 995 }
fb73857a 996 break;
79072805 997 case '\024': /* ^T */
823a54a3 998 if (nextchar == '\0') {
88e89b8a 999#ifdef BIG_TIME
7c36658b 1000 sv_setnv(sv, PL_basetime);
88e89b8a 1001#else
7c36658b 1002 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 1003#endif
7c36658b 1004 }
823a54a3 1005 else if (strEQ(remaining, "AINT"))
284167a5
S		 1006 sv_setiv(sv, TAINTING_get
1007 ? (TAINT_WARN_get || PL_unsafe ? -1 : 1)
9aa05f58 1008 : 0);
7c36658b 1009 break;
e07ea26a 1010 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 1011 if (strEQ(remaining, "NICODE"))
a05d7ebb 1012 sv_setuv(sv, (UV) PL_unicode);
823a54a3 1013 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 1014 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC		 1015 else if (strEQ(remaining, "TF8CACHE"))
1016 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH		 1017 break;
1018 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 1019 if (nextchar == '\0')
4438c4b7 1020 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 1021 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 1022 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 1023 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS		 1024 }
1025 else if (PL_compiling.cop_warnings == pWARN_STD) {
7e4f0450
FC		 1026 sv_setsv(sv, &PL_sv_undef);
1027 break;
013b78e8 1028 }
d3a7d8c7 1029 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS		 1030 /* Get the bit mask for $warnings::Bits{all}, because
1031 * it could have been extended by warnings::register */
4bac9ae4
CS		 1032 HV * const bits = get_hv("warnings::Bits", 0);
1033 SV ** const bits_all = bits ? hv_fetchs(bits, "all", FALSE) : NULL;
1034 if (bits_all)
1035 sv_copypv(sv, *bits_all);
1036 else
1037 sv_setpvn(sv, WARN_ALLstring, WARNsize);
ac27b0f5 1038 }
4438c4b7 1039 else {
72dc9ed5
NC		 1040 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
1041 *PL_compiling.cop_warnings);
ac27b0f5 1042 }
4438c4b7 1043 }
79072805 1044 break;
79072805 1045 case '+':
aaa362c4 1046 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM		 1047 paren = RX_LASTPAREN(rx);
1048 if (paren)
1049 goto do_numbuf_fetch;
79072805 1050 }
3280af22 1051 sv_setsv(sv,&PL_sv_undef);
79072805 1052 break;
a01268b5
JH		 1053 case '\016': /* ^N */
1054 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2c7b5d76
DM		 1055 paren = RX_LASTCLOSEPAREN(rx);
1056 if (paren)
1057 goto do_numbuf_fetch;
a01268b5
JH		 1058 }
1059 sv_setsv(sv,&PL_sv_undef);
1060 break;
79072805 1061 case '.':
3280af22 1062 if (GvIO(PL_last_in_gv)) {
357c8808 1063 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 1064 }
79072805
LW		 1065 break;
1066 case '?':
809a5acc 1067 {
809a5acc 1068 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 1069#ifdef COMPLEX_STATUS
41cb7b2b 1070 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS		 1071 LvTARGOFF(sv) = PL_statusvalue;
1072 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 1073#endif
809a5acc 1074 }
79072805
LW		 1075 break;
1076 case '^':
acbe1b9d 1077 if (GvIOp(PL_defoutgv))
099be4f1 1078 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW		 1079 if (s)
1080 sv_setpv(sv,s);
1081 else {
3280af22 1082 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 1083 sv_catpvs(sv,"_TOP");
79072805
LW		 1084 }
1085 break;
1086 case '~':
acbe1b9d 1087 if (GvIOp(PL_defoutgv))
0daa599b 1088 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 1089 if (!s)
3280af22 1090 s = GvENAME(PL_defoutgv);
79072805
LW		 1091 sv_setpv(sv,s);
1092 break;
79072805 1093 case '=':
099be4f1 1094 if (GvIO(PL_defoutgv))
0daa599b 1095 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW		 1096 break;
1097 case '-':
099be4f1 1098 if (GvIO(PL_defoutgv))
0daa599b 1099 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW		 1100 break;
1101 case '%':
099be4f1 1102 if (GvIO(PL_defoutgv))
0daa599b 1103 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1104 break;
79072805
LW		 1105 case ':':
1106 break;
1107 case '/':
1108 break;
1109 case '[':
e1dccc0d 1110 sv_setiv(sv, 0);
79072805
LW		 1111 break;
1112 case '|':
099be4f1 1113 if (GvIO(PL_defoutgv))
0daa599b 1114 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1115 break;
79072805 1116 case '\\':
b2ce0fda 1117 if (PL_ors_sv)
f28098ff 1118 sv_copypv(sv, PL_ors_sv);
4bac9ae4
CS		 1119 else
1120 sv_setsv(sv, &PL_sv_undef);
79072805 1121 break;
0e219455 1122 case '$': /* $$ */
9cdac2a2
FC		 1123 {
1124 IV const pid = (IV)PerlProc_getpid();
19db9fb7 1125 if (isGV(mg->mg_obj) || SvIV(mg->mg_obj) != pid) {
9cdac2a2
FC		 1126 /* never set manually, or at least not since last fork */
1127 sv_setiv(sv, pid);
19db9fb7
Z		 1128 /* never unsafe, even if reading in a tainted expression */
1129 SvTAINTED_off(sv);
1130 }
9cdac2a2
FC		 1131 /* else a value has been assigned manually, so do nothing */
1132 }
0e219455 1133 break;
79072805 1134 case '<':
dfff4baf 1135 sv_setuid(sv, PerlProc_getuid());
79072805
LW		 1136 break;
1137 case '>':
dfff4baf 1138 sv_setuid(sv, PerlProc_geteuid());
79072805
LW		 1139 break;
1140 case '(':
dfff4baf 1141 sv_setgid(sv, PerlProc_getgid());
79072805
LW		 1142 goto add_groups;
1143 case ')':
dfff4baf 1144 sv_setgid(sv, PerlProc_getegid());
79072805 1145 add_groups:
79072805 1146#ifdef HAS_GETGROUPS
79072805 1147 {
57d7c65e 1148 Groups_t *gary = NULL;
375ed12a
JH		 1149 I32 i;
1150 I32 num_groups = getgroups(0, gary);
1151 if (num_groups > 0) {
1152 Newx(gary, num_groups, Groups_t);
1153 num_groups = getgroups(num_groups, gary);
1154 for (i = 0; i < num_groups; i++)
1155 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
1156 Safefree(gary);
1157 }
79072805 1158 }
155aba94 1159 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1160#endif
79072805 1161 break;
79072805
LW		 1162 case '0':
1163 break;
1164 }
a0d0e21e 1165 return 0;
79072805
LW		 1166}
1167
1168int
864dbfa3 1169Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1170{
8772537c 1171 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1172
7918f24d
NC		 1173 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1174
79072805 1175 if (uf && uf->uf_val)
24f81a43 1176 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW		 1177 return 0;
1178}
1179
1180int
864dbfa3 1181Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1182{
9ae3433d 1183 STRLEN len = 0, klen;
12033064 1184 const char * const key = MgPV_const(mg,klen);
888a67f6 1185 const char *s = "";
1e422769 1186
7918f24d
NC		 1187 PERL_ARGS_ASSERT_MAGIC_SETENV;
1188
613c63b4 1189 SvGETMAGIC(sv);
12033064 1190 if (SvOK(sv)) {
613c63b4
CS		 1191 /* defined environment variables are byte strings; unfortunately
1192 there is no SvPVbyte_force_nomg(), so we must do this piecewise */
1193 (void)SvPV_force_nomg_nolen(sv);
1194 sv_utf8_downgrade(sv, /* fail_ok */ TRUE);
1195 if (SvUTF8(sv)) {
1196 Perl_ck_warner_d(aTHX_ packWARN(WARN_UTF8), "Wide character in %s", "setenv");
1197 SvUTF8_off(sv);
1198 }
1199 s = SvPVX(sv);
1200 len = SvCUR(sv);
12033064
CS		 1201 }
1202 my_setenv(key, s); /* does the deed */
1203
a0d0e21e
LW		 1204#ifdef DYNAMIC_ENV_FETCH
1205 /* We just undefd an environment var. Is a replacement */
1206 /* waiting in the wings? */
1207 if (!len) {
6bd66ee9 1208 SV ** const valp = hv_fetch(GvHVn(PL_envgv), key, klen, FALSE);
fabdb6c0 1209 if (valp)
4ab59fcc 1210 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW		 1211 }
1212#endif
1e422769 1213
39e571d4 1214#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW		 1215 /* And you'll never guess what the dog had */
1216 /* in its mouth... */
284167a5 1217 if (TAINTING_get) {
1e422769 1218 MgTAINTEDDIR_off(mg);
1219#ifdef VMS
6bd66ee9 1220 if (s && klen == 8 && strEQ(key, "DCL$PATH")) {
b8ffc8df 1221 char pathbuf[256], eltbuf[256], *cp, *elt;
1e422769 1222 int i = 0, j = 0;
1223
6fca0082 1224 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1225 elt = eltbuf;
1e422769 1226 do { /* DCL$PATH may be a search list */
1227 while (1) { /* as may dev portion of any element */
1228 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1229 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1230 cando_by_name(S_IWUSR,0,elt) ) {
1231 MgTAINTEDDIR_on(mg);
1232 return 0;
1233 }
1234 }
bd61b366 1235 if ((cp = strchr(elt, ':')) != NULL)
1e422769 1236 *cp = '\0';
1237 if (my_trnlnm(elt, eltbuf, j++))
1238 elt = eltbuf;
1239 else
1240 break;
1241 }
1242 j = 0;
1243 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1244 }
1245#endif /* VMS */
12033064 1246 if (s && klen == 4 && strEQ(key,"PATH")) {
8772537c 1247 const char * const strend = s + len;
463ee0b2
LW		 1248
1249 while (s < strend) {
96827780 1250 char tmpbuf[256];
c623ac67 1251 Stat_t st;
5f74f29c 1252 I32 i;
f5a63d97
AL		 1253#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1254 const char path_sep = '|';
1255#else
1256 const char path_sep = ':';
1257#endif
96827780 1258 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1259 s, strend, path_sep, &i);
463ee0b2 1260 s++;
bb7a0f54 1261 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB		 1262#ifdef VMS
1263 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1264#else
1265 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1266#endif
c6ed36e1 1267 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1268 MgTAINTEDDIR_on(mg);
1e422769 1269 return 0;
1270 }
463ee0b2 1271 }
79072805
LW		 1272 }
1273 }
39e571d4 1274#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1275
79072805
LW		 1276 return 0;
1277}
1278
1279int
864dbfa3 1280Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1281{
7918f24d 1282 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1283 PERL_UNUSED_ARG(sv);
bd61b366 1284 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW		 1285 return 0;
1286}
1287
88e89b8a 1288int
864dbfa3 1289Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1290{
7918f24d 1291 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1292 PERL_UNUSED_ARG(mg);
b0269e46 1293#if defined(VMS)
cea2e8a9 1294 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1295#else
3280af22 1296 if (PL_localizing) {
fb73857a 1297 HE* entry;
b0269e46 1298 my_clearenv();
85fbaab2
NC		 1299 hv_iterinit(MUTABLE_HV(sv));
1300 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a 1301 I32 keylen;
1302 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1303 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a 1304 }
1305 }
1306#endif
1307 return 0;
1308}
1309
1310int
864dbfa3 1311Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1312{
7918f24d 1313 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL		 1314 PERL_UNUSED_ARG(sv);
1315 PERL_UNUSED_ARG(mg);
b0269e46
AB		 1316#if defined(VMS)
1317 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1318#else
1319 my_clearenv();
1320#endif
3e3baf6d 1321 return 0;
66b1d557
HM		 1322}
1323
64ca3a65 1324#ifndef PERL_MICRO
2d4fcd5e
AJ		 1325#ifdef HAS_SIGPROCMASK
1326static void
1327restore_sigmask(pTHX_ SV *save_sv)
1328{
0bd48802 1329 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1330 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ		 1331}
1332#endif
66b1d557 1333int
864dbfa3 1334Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1335{
88e89b8a 1336 /* Are we fetching a signal entry? */
708854f2 1337 int i = (I16)mg->mg_private;
7918f24d
NC		 1338
1339 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1340
708854f2 1341 if (!i) {
84c7b88c
BF		 1342 STRLEN siglen;
1343 const char * sig = MgPV_const(mg, siglen);
1344 mg->mg_private = i = whichsig_pvn(sig, siglen);
708854f2
NC		 1345 }
1346
e02bfb16 1347 if (i > 0) {
22c35a8c
GS		 1348 if(PL_psig_ptr[i])
1349 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1350 else {
46da273f 1351 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1352#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL		 1353 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1354 sigstate = SIG_IGN;
2e34cc90
CL		 1355#endif
1356#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL		 1357 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1358 sigstate = SIG_DFL;
85b332e2 1359#endif
88e89b8a 1360 /* cache state so we don't fetch it again */
8aad04aa 1361 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1362 sv_setpvs(sv,"IGNORE");
88e89b8a 1363 else
3280af22 1364 sv_setsv(sv,&PL_sv_undef);
46da273f 1365 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a 1366 SvTEMP_off(sv);
1367 }
1368 }
1369 return 0;
1370}
1371int
864dbfa3 1372Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1373{
7918f24d 1374 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
179c85a2 1375
38a124f0 1376 magic_setsig(NULL, mg);
179c85a2 1377 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1378}
3d37d572 1379
0a8e0eff 1380Signal_t
8aad04aa 1381#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1382Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1383#else
0a8e0eff 1384Perl_csighandler(int sig)
8aad04aa 1385#endif
0a8e0eff 1386{
1018e26f
NIS		 1387#ifdef PERL_GET_SIG_CONTEXT
1388 dTHXa(PERL_GET_SIG_CONTEXT);
1389#else
85b332e2
CL		 1390 dTHX;
1391#endif
ffb6256b
JH		 1392#if defined(__cplusplus) && defined(__GNUC__)
1393 /* g++ doesn't support PERL_UNUSED_DECL, so the sip and uap
1394 * parameters would be warned about. */
1395 PERL_UNUSED_ARG(sip);
1396 PERL_UNUSED_ARG(uap);
1397#endif
23ada85b 1398#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1399 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1400 if (PL_sig_ignoring[sig]) return;
85b332e2 1401#endif
2e34cc90 1402#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1403 if (PL_sig_defaulting[sig])
2e34cc90
CL		 1404#ifdef KILL_BY_SIGPRC
1405 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1406#else
1407 exit(1);
1408#endif
1409#endif
406878dd 1410 if (
853d2c32
RGS		 1411#ifdef SIGILL
1412 sig == SIGILL ||
1413#endif
1414#ifdef SIGBUS
1415 sig == SIGBUS ||
1416#endif
1417#ifdef SIGSEGV
1418 sig == SIGSEGV ||
1419#endif
1420 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1421 /* Call the perl level handler now--
31c91b43 1422 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1423#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1424 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB		 1425#else
1426 (*PL_sighandlerp)(sig);
92807b6d 1427#endif
406878dd 1428 else {
31c91b43 1429 if (!PL_psig_pend) return;
406878dd
GA		 1430 /* Set a flag to say this signal is pending, that is awaiting delivery after
1431 * the current Perl opcode completes */
1432 PL_psig_pend[sig]++;
1433
1434#ifndef SIG_PENDING_DIE_COUNT
1435# define SIG_PENDING_DIE_COUNT 120
1436#endif
fe13d51d 1437 /* Add one to say _a_ signal is pending */
406878dd
GA		 1438 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1439 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1440 (unsigned long)SIG_PENDING_DIE_COUNT);
1441 }
0a8e0eff
NIS		 1442}
1443
2e34cc90
CL		 1444#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1445void
1446Perl_csighandler_init(void)
1447{
1448 int sig;
27da23d5 1449 if (PL_sig_handlers_initted) return;
2e34cc90
CL		 1450
1451 for (sig = 1; sig < SIG_SIZE; sig++) {
1452#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1453 dTHX;
27da23d5 1454 PL_sig_defaulting[sig] = 1;
5c1546dc 1455 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL		 1456#endif
1457#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1458 PL_sig_ignoring[sig] = 0;
2e34cc90
CL		 1459#endif
1460 }
27da23d5 1461 PL_sig_handlers_initted = 1;
2e34cc90
CL		 1462}
1463#endif
1464
7fe50b8b
LT		 1465#if defined HAS_SIGPROCMASK
1466static void
1467unblock_sigmask(pTHX_ void* newset)
1468{
dc3bf405 1469 PERL_UNUSED_CONTEXT;
7fe50b8b
LT		 1470 sigprocmask(SIG_UNBLOCK, (sigset_t*)newset, NULL);
1471}
1472#endif
1473
0a8e0eff
NIS		 1474void
1475Perl_despatch_signals(pTHX)
1476{
1477 int sig;
1478 PL_sig_pending = 0;
1479 for (sig = 1; sig < SIG_SIZE; sig++) {
1480 if (PL_psig_pend[sig]) {
d0166017 1481 dSAVE_ERRNO;
7fe50b8b 1482#ifdef HAS_SIGPROCMASK
55534442
LT		 1483 /* From sigaction(2) (FreeBSD man page):
1484 * | Signal routines normally execute with the signal that
1485 * | caused their invocation blocked, but other signals may
1486 * | yet occur.
1487 * Emulation of this behavior (from within Perl) is enabled
1488 * using sigprocmask
1489 */
1490 int was_blocked;
1491 sigset_t newset, oldset;
1492
1493 sigemptyset(&newset);
1494 sigaddset(&newset, sig);
1495 sigprocmask(SIG_BLOCK, &newset, &oldset);
1496 was_blocked = sigismember(&oldset, sig);
7fe50b8b
LT		 1497 if (!was_blocked) {
1498 SV* save_sv = newSVpvn((char *)(&newset), sizeof(sigset_t));
1499 ENTER;
1500 SAVEFREESV(save_sv);
1501 SAVEDESTRUCTOR_X(unblock_sigmask, SvPV_nolen(save_sv));
1502 }
55534442 1503#endif
25da4428 1504 PL_psig_pend[sig] = 0;
6e324d09 1505#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1506 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB		 1507#else
1508 (*PL_sighandlerp)(sig);
92807b6d 1509#endif
7fe50b8b 1510#ifdef HAS_SIGPROCMASK
55534442 1511 if (!was_blocked)
7fe50b8b 1512 LEAVE;
55534442 1513#endif
d0166017 1514 RESTORE_ERRNO;
0a8e0eff
NIS		 1515 }
1516 }
1517}
1518
38a124f0 1519/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1520int
864dbfa3 1521Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1522{
27da23d5 1523 dVAR;
79072805 1524 I32 i;
cbbf8932 1525 SV** svp = NULL;
2d4fcd5e
AJ		 1526 /* Need to be careful with SvREFCNT_dec(), because that can have side
1527 * effects (due to closures). We must make sure that the new disposition
1528 * is in place before it is called.
1529 */
cbbf8932 1530 SV* to_dec = NULL;
e72dc28c 1531 STRLEN len;
2d4fcd5e
AJ		 1532#ifdef HAS_SIGPROCMASK
1533 sigset_t set, save;
1534 SV* save_sv;
1535#endif
eb578fdb 1536 const char *s = MgPV_const(mg,len);
7918f24d
NC		 1537
1538 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1539
748a9306 1540 if (*s == '_') {
84c7b88c 1541 if (memEQs(s, len, "__DIE__"))
3280af22 1542 svp = &PL_diehook;
84c7b88c 1543 else if (memEQs(s, len, "__WARN__")
38a124f0
NC		 1544 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1545 /* Merge the existing behaviours, which are as follows:
1546 magic_setsig, we always set svp to &PL_warnhook
1547 (hence we always change the warnings handler)
1548 For magic_clearsig, we don't change the warnings handler if it's
1549 set to the &PL_warnhook. */
3280af22 1550 svp = &PL_warnhook;
84c7b88c
BF		 1551 } else if (sv) {
1552 SV *tmp = sv_newmortal();
1553 Perl_croak(aTHX_ "No such hook: %s",
1554 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1555 }
748a9306 1556 i = 0;
38a124f0 1557 if (svp && *svp) {
9289f461
RGS		 1558 if (*svp != PERL_WARNHOOK_FATAL)
1559 to_dec = *svp;
cbbf8932 1560 *svp = NULL;
4633a7c4 1561 }
748a9306
LW		 1562 }
1563 else {
708854f2
NC		 1564 i = (I16)mg->mg_private;
1565 if (!i) {
84c7b88c 1566 i = whichsig_pvn(s, len); /* ...no, a brick */
58a26b12 1567 mg->mg_private = (U16)i;
708854f2 1568 }
86d86cad 1569 if (i <= 0) {
84c7b88c
BF		 1570 if (sv) {
1571 SV *tmp = sv_newmortal();
1572 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s",
1573 pv_pretty(tmp, s, len, 0, NULL, NULL, 0));
1574 }
748a9306
LW		 1575 return 0;
1576 }
2d4fcd5e
AJ		 1577#ifdef HAS_SIGPROCMASK
1578 /* Avoid having the signal arrive at a bad time, if possible. */
1579 sigemptyset(&set);
1580 sigaddset(&set,i);
1581 sigprocmask(SIG_BLOCK, &set, &save);
1582 ENTER;
9ff8e806 1583 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ		 1584 SAVEFREESV(save_sv);
1585 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1586#endif
1587 PERL_ASYNC_CHECK();
2e34cc90 1588#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1589 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1590#endif
23ada85b 1591#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1592 PL_sig_ignoring[i] = 0;
85b332e2 1593#endif
2e34cc90 1594#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1595 PL_sig_defaulting[i] = 0;
2e34cc90 1596#endif
2d4fcd5e 1597 to_dec = PL_psig_ptr[i];
38a124f0
NC		 1598 if (sv) {
1599 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1600 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC		 1601
1602 /* Signals don't change name during the program's execution, so once
1603 they're cached in the appropriate slot of PL_psig_name, they can
1604 stay there.
1605
1606 Ideally we'd find some way of making SVs at (C) compile time, or
1607 at least, doing most of the work. */
1608 if (!PL_psig_name[i]) {
1609 PL_psig_name[i] = newSVpvn(s, len);
1610 SvREADONLY_on(PL_psig_name[i]);
1611 }
38a124f0 1612 } else {
79fd3822 1613 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC		 1614 PL_psig_name[i] = NULL;
1615 PL_psig_ptr[i] = NULL;
1616 }
748a9306 1617 }
38a124f0 1618 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1619 if (i) {
5c1546dc 1620 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1621 }
748a9306 1622 else
b37c2d43 1623 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1624 } else {
9dfa190b
NC		 1625 if (sv && SvOK(sv)) {
1626 s = SvPV_force(sv, len);
1627 } else {
1628 sv = NULL;
1629 }
84c7b88c 1630 if (sv && memEQs(s, len,"IGNORE")) {
9dfa190b 1631 if (i) {
23ada85b 1632#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC		 1633 PL_sig_ignoring[i] = 1;
1634 (void)rsignal(i, PL_csighandlerp);
85b332e2 1635#else
9dfa190b 1636 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1637#endif
9dfa190b 1638 }
2d4fcd5e 1639 }
84c7b88c 1640 else if (!sv || memEQs(s, len,"DEFAULT") || !len) {
9dfa190b 1641 if (i) {
2e34cc90 1642#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC		 1643 PL_sig_defaulting[i] = 1;
1644 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1645#else
9dfa190b 1646 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1647#endif
9dfa190b
NC		 1648 }
1649 }
1650 else {
1651 /*
1652 * We should warn if HINT_STRICT_REFS, but without
1653 * access to a known hint bit in a known OP, we can't
1654 * tell whether HINT_STRICT_REFS is in force or not.
1655 */
1656 if (!strchr(s,':') && !strchr(s,'\''))
1657 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1658 SV_GMAGIC);
1659 if (i)
1660 (void)rsignal(i, PL_csighandlerp);
1661 else
1662 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1663 }
748a9306 1664 }
9dfa190b 1665
2d4fcd5e
AJ		 1666#ifdef HAS_SIGPROCMASK
1667 if(i)
1668 LEAVE;
1669#endif
ef8d46e8 1670 SvREFCNT_dec(to_dec);
79072805
LW		 1671 return 0;
1672}
64ca3a65 1673#endif /* !PERL_MICRO */
79072805
LW		 1674
1675int
864dbfa3 1676Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1677{
7918f24d 1678 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1679 PERL_UNUSED_ARG(sv);
e1a479c5 1680
89c14e2e 1681 /* Skip _isaelem because _isa will handle it shortly */
354b0578 1682 if (PL_delaymagic & DM_ARRAY_ISA && mg->mg_type == PERL_MAGIC_isaelem)
89c14e2e
BB		 1683 return 0;
1684
0e446081 1685 return magic_clearisa(NULL, mg);
463ee0b2
LW		 1686}
1687
0e446081 1688/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1689int
52b45067
RD		 1690Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1691{
52b45067 1692 HV* stash;
7918f24d
NC		 1693 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1694
52b45067 1695 /* Bail out if destruction is going on */
627364f1 1696 if(PL_phase == PERL_PHASE_DESTRUCT) return 0;
52b45067 1697
0e446081
NC		 1698 if (sv)
1699 av_clear(MUTABLE_AV(sv));
52b45067 1700
6624142a
FC		 1701 if (SvTYPE(mg->mg_obj) != SVt_PVGV && SvSMAGICAL(mg->mg_obj))
1702 /* This occurs with setisa_elem magic, which calls this
1703 same function. */
1704 mg = mg_find(mg->mg_obj, PERL_MAGIC_isa);
1705
316ebaf2 1706 assert(mg);
6624142a
FC		 1707 if (SvTYPE(mg->mg_obj) == SVt_PVAV) { /* multiple stashes */
1708 SV **svp = AvARRAY((AV *)mg->mg_obj);
1709 I32 items = AvFILLp((AV *)mg->mg_obj) + 1;
1710 while (items--) {
1711 stash = GvSTASH((GV *)*svp++);
1712 if (stash && HvENAME(stash)) mro_isa_changed_in(stash);
1713 }
1714
1715 return 0;
1716 }
1717
52b45067 1718 stash = GvSTASH(
6624142a 1719 (const GV *)mg->mg_obj
52b45067
RD		 1720 );
1721
00169e2c
FC		 1722 /* The stash may have been detached from the symbol table, so check its
1723 name before doing anything. */
1724 if (stash && HvENAME_get(stash))
5562fa71 1725 mro_isa_changed_in(stash);
52b45067
RD		 1726
1727 return 0;
1728}
1729
1730int
864dbfa3 1731Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1732{
85fbaab2 1733 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1734 I32 i = 0;
7918f24d
NC		 1735
1736 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1737 PERL_UNUSED_ARG(mg);
7719e241 1738
6ff81951 1739 if (hv) {
497b47a8 1740 (void) hv_iterinit(hv);
ad64d0ec 1741 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
1b95d04f 1742 i = HvUSEDKEYS(hv);
497b47a8
JH		 1743 else {
1744 while (hv_iternext(hv))
1745 i++;
1746 }
6ff81951
GS		 1747 }
1748
1749 sv_setiv(sv, (IV)i);
1750 return 0;
1751}
1752
1753int
864dbfa3 1754Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1755{
7918f24d 1756 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1757 PERL_UNUSED_ARG(mg);
946ec16e 1758 if (LvTARG(sv)) {
85fbaab2 1759 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e 1760 }
1761 return 0;
ac27b0f5 1762}
946ec16e 1763
efaf3674
DM		 1764/*
1765=for apidoc magic_methcall
1766
1767Invoke a magic method (like FETCH).
1768
2baee27b
FC		 1769C<sv> and C<mg> are the tied thingy and the tie magic.
1770
1771C<meth> is the name of the method to call.
1772
1773C<argc> is the number of args (in addition to $self) to pass to the method.
1774
1775The C<flags> can be:
1776
1777 G_DISCARD invoke method with G_DISCARD flag and don't
1778 return a value
1779 G_UNDEF_FILL fill the stack with argc pointers to
1780 PL_sv_undef
1781
1782The arguments themselves are any values following the C<flags> argument.
efaf3674
DM		 1783
1784Returns the SV (if any) returned by the method, or NULL on failure.
1785
1786
1787=cut
1788*/
1789
1790SV*
36925d9e 1791Perl_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
046b0c7d 1792 U32 argc, ...)
a0d0e21e
LW		 1793{
1794 dSP;
efaf3674 1795 SV* ret = NULL;
463ee0b2 1796
7918f24d
NC		 1797 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1798
efaf3674 1799 ENTER;
d1d7a15d
NC		 1800
1801 if (flags & G_WRITING_TO_STDERR) {
1802 SAVETMPS;
1803
d1d7a15d
NC		 1804 SAVESPTR(PL_stderrgv);
1805 PL_stderrgv = NULL;
1806 }
1807
efaf3674 1808 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1809 PUSHMARK(SP);
efaf3674 1810
67549bd2
NC		 1811 EXTEND(SP, argc+1);
1812 PUSHs(SvTIED_obj(sv, mg));
1813 if (flags & G_UNDEF_FILL) {
1814 while (argc--) {
efaf3674 1815 PUSHs(&PL_sv_undef);
93965878 1816 }
67549bd2 1817 } else if (argc > 0) {
046b0c7d
NC		 1818 va_list args;
1819 va_start(args, argc);
1820
1821 do {
1822 SV *const sv = va_arg(args, SV *);
1823 PUSHs(sv);
1824 } while (--argc);
1825
1826 va_end(args);
88e89b8a 1827 }
463ee0b2 1828 PUTBACK;
efaf3674 1829 if (flags & G_DISCARD) {
36925d9e 1830 call_sv(meth, G_SCALAR|G_DISCARD|G_METHOD_NAMED);
efaf3674
DM		 1831 }
1832 else {
36925d9e 1833 if (call_sv(meth, G_SCALAR|G_METHOD_NAMED))
efaf3674
DM		 1834 ret = *PL_stack_sp--;
1835 }
1836 POPSTACK;
d1d7a15d
NC		 1837 if (flags & G_WRITING_TO_STDERR)
1838 FREETMPS;
efaf3674
DM		 1839 LEAVE;
1840 return ret;
1841}
1842
efaf3674 1843/* wrapper for magic_methcall that creates the first arg */
463ee0b2 1844
efaf3674 1845STATIC SV*
36925d9e 1846S_magic_methcall1(pTHX_ SV *sv, const MAGIC *mg, SV *meth, U32 flags,
efaf3674
DM		 1847 int n, SV *val)
1848{
efaf3674
DM		 1849 SV* arg1 = NULL;
1850
1851 PERL_ARGS_ASSERT_MAGIC_METHCALL1;
1852
1853 if (mg->mg_ptr) {
1854 if (mg->mg_len >= 0) {
db4b3a1d 1855 arg1 = newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
efaf3674
DM		 1856 }
1857 else if (mg->mg_len == HEf_SVKEY)
1858 arg1 = MUTABLE_SV(mg->mg_ptr);
1859 }
1860 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
db4b3a1d 1861 arg1 = newSViv((IV)(mg->mg_len));
efaf3674
DM		 1862 sv_2mortal(arg1);
1863 }
1864 if (!arg1) {
046b0c7d 1865 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n - 1, val);
efaf3674 1866 }
046b0c7d 1867 return Perl_magic_methcall(aTHX_ sv, mg, meth, flags, n, arg1, val);
946ec16e 1868}
1869
76e3520e 1870STATIC int
36925d9e 1871S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, SV *meth)
a0d0e21e 1872{
efaf3674 1873 SV* ret;
463ee0b2 1874
7918f24d
NC		 1875 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1876
efaf3674
DM		 1877 ret = magic_methcall1(sv, mg, meth, 0, 1, NULL);
1878 if (ret)
1879 sv_setsv(sv, ret);
a0d0e21e
LW		 1880 return 0;
1881}
463ee0b2 1882
a0d0e21e 1883int
864dbfa3 1884Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1885{
7918f24d
NC		 1886 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1887
fd69380d 1888 if (mg->mg_type == PERL_MAGIC_tiedelem)
a0d0e21e 1889 mg->mg_flags |= MGf_GSKIP;
36925d9e 1890 magic_methpack(sv,mg,SV_CONST(FETCH));
463ee0b2
LW		 1891 return 0;
1892}
1893
1894int
864dbfa3 1895Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1896{
b112cff9
DM		 1897 MAGIC *tmg;
1898 SV *val;
7918f24d
NC		 1899
1900 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1901
b112cff9
DM		 1902 /* in the code C<$tied{foo} = $val>, the "thing" that gets passed to
1903 * STORE() is not $val, but rather a PVLV (the sv in this call), whose
1904 * public flags indicate its value based on copying from $val. Doing
1905 * mg_set() on the PVLV temporarily does SvMAGICAL_off(), then calls us.
1906 * So STORE()'s $_[2] arg is a temporarily disarmed PVLV. This goes
1907 * wrong if $val happened to be tainted, as sv hasn't got magic
1908 * enabled, even though taint magic is in the chain. In which case,
1909 * fake up a temporary tainted value (this is easier than temporarily
1910 * re-enabling magic on sv). */
1911
284167a5 1912 if (TAINTING_get && (tmg = mg_find(sv, PERL_MAGIC_taint))
b112cff9
DM		 1913 && (tmg->mg_len & 1))
1914 {
1915 val = sv_mortalcopy(sv);
1916 SvTAINTED_on(val);
1917 }
1918 else
1919 val = sv;
1920
36925d9e 1921 magic_methcall1(sv, mg, SV_CONST(STORE), G_DISCARD, 2, val);
463ee0b2
LW		 1922 return 0;
1923}
1924
1925int
864dbfa3 1926Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1927{
7918f24d
NC		 1928 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1929
4c13be3f 1930 if (mg->mg_type == PERL_MAGIC_tiedscalar) return 0;
36925d9e 1931 return magic_methpack(sv,mg,SV_CONST(DELETE));
a0d0e21e 1932}
463ee0b2 1933
93965878
NIS		 1934
1935U32
864dbfa3 1936Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1937{
22846ab4 1938 I32 retval = 0;
efaf3674 1939 SV* retsv;
93965878 1940
7918f24d
NC		 1941 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1942
36925d9e 1943 retsv = magic_methcall1(sv, mg, SV_CONST(FETCHSIZE), 0, 1, NULL);
efaf3674
DM		 1944 if (retsv) {
1945 retval = SvIV(retsv)-1;
22846ab4
AB		 1946 if (retval < -1)
1947 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1948 }
22846ab4 1949 return (U32) retval;
93965878
NIS		 1950}
1951
cea2e8a9
GS		 1952int
1953Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1954{
7918f24d
NC		 1955 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1956
36925d9e 1957 Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(CLEAR), G_DISCARD, 0);
463ee0b2
LW		 1958 return 0;
1959}
1960
1961int
864dbfa3 1962Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1963{
efaf3674 1964 SV* ret;
463ee0b2 1965
7918f24d
NC		 1966 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1967
36925d9e
RZ		 1968 ret = SvOK(key) ? Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(NEXTKEY), 0, 1, key)
1969 : Perl_magic_methcall(aTHX_ sv, mg, SV_CONST(FIRSTKEY), 0, 0);
efaf3674
DM		 1970 if (ret)
1971 sv_setsv(key,ret);
79072805
LW		 1972 return 0;
1973}
1974
1975int
1146e912 1976Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1977{
7918f24d
NC		 1978 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1979
36925d9e 1980 return magic_methpack(sv,mg,SV_CONST(EXISTS));
ac27b0f5 1981}
a0d0e21e 1982
a3bcc51e
TP		 1983SV *
1984Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1985{
5fcbf73d 1986 SV *retval;
ad64d0ec
NC		 1987 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1988 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1989
7918f24d
NC		 1990 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1991
a3bcc51e
TP		 1992 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1993 SV *key;
bfcb3514 1994 if (HvEITER_get(hv))
a3bcc51e
TP		 1995 /* we are in an iteration so the hash cannot be empty */
1996 return &PL_sv_yes;
1997 /* no xhv_eiter so now use FIRSTKEY */
1998 key = sv_newmortal();
ad64d0ec 1999 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 2000 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP		 2001 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
2002 }
2003
2004 /* there is a SCALAR method that we can call */
36925d9e 2005 retval = Perl_magic_methcall(aTHX_ MUTABLE_SV(hv), mg, SV_CONST(SCALAR), 0, 0);
efaf3674 2006 if (!retval)
5fcbf73d 2007 retval = &PL_sv_undef;
a3bcc51e
TP		 2008 return retval;
2009}
2010
a0d0e21e 2011int
864dbfa3 2012Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 2013{
089b5c60 2014 SV **svp;
7918f24d
NC		 2015
2016 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
2017
089b5c60
NC		 2018 /* The magic ptr/len for the debugger's hash should always be an SV. */
2019 if (UNLIKELY(mg->mg_len != HEf_SVKEY)) {
2020 Perl_croak(aTHX_ "panic: magic_setdbline len=%"IVdf", ptr='%s'",
7b0eb0b8 2021 (IV)mg->mg_len, mg->mg_ptr);
089b5c60
NC		 2022 }
2023
2024 /* Use sv_2iv instead of SvIV() as the former generates smaller code, and
2025 setting/clearing debugger breakpoints is not a hot path. */
43e4250a
FC		 2026 svp = av_fetch(MUTABLE_AV(mg->mg_obj),
2027 sv_2iv(MUTABLE_SV((mg)->mg_ptr)), FALSE);
089b5c60 2028
8772537c 2029 if (svp && SvIOKp(*svp)) {
88df5f01
FC		 2030 OP * const o = INT2PTR(OP*,SvIVX(*svp));
2031 if (o) {
2032#ifdef PERL_DEBUG_READONLY_OPS
2033 Slab_to_rw(OpSLAB(o));
2034#endif
2035 /* set or clear breakpoint in the relevant control op */
089b5c60 2036 if (SvTRUE(sv))
88df5f01 2037 o->op_flags |= OPf_SPECIAL;
8772537c 2038 else
88df5f01
FC		 2039 o->op_flags &= ~OPf_SPECIAL;
2040#ifdef PERL_DEBUG_READONLY_OPS
2041 Slab_to_ro(OpSLAB(o));
2042#endif
8772537c 2043 }
5df8de69 2044 }
79072805
LW		 2045 return 0;
2046}
2047
2048int
8772537c 2049Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 2050{
502c6561 2051 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC		 2052
2053 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
2054
83bf042f 2055 if (obj) {
e1dccc0d 2056 sv_setiv(sv, AvFILL(obj));
83bf042f 2057 } else {
d4a823b3 2058 sv_setsv(sv, NULL);
83bf042f 2059 }
79072805
LW		 2060 return 0;
2061}
2062
2063int
864dbfa3 2064Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 2065{
502c6561 2066 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC		 2067
2068 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
2069
83bf042f 2070 if (obj) {
e1dccc0d 2071 av_fill(obj, SvIV(sv));
83bf042f 2072 } else {
a2a5de95
NC		 2073 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
2074 "Attempt to set length of freed array");
83bf042f
NC		 2075 }
2076 return 0;
2077}
2078
2079int
83f29afa
VP		 2080Perl_magic_cleararylen_p(pTHX_ SV *sv, MAGIC *mg)
2081{
83f29afa
VP		 2082 PERL_ARGS_ASSERT_MAGIC_CLEARARYLEN_P;
2083 PERL_UNUSED_ARG(sv);
dc3bf405 2084 PERL_UNUSED_CONTEXT;
83f29afa
VP		 2085
2086 /* Reset the iterator when the array is cleared */
3565fbf3
VP		 2087#if IVSIZE == I32SIZE
2088 *((IV *) &(mg->mg_len)) = 0;
2089#else
83f29afa
VP		 2090 if (mg->mg_ptr)
2091 *((IV *) mg->mg_ptr) = 0;
3565fbf3 2092#endif
83f29afa
VP		 2093
2094 return 0;
2095}
2096
2097int
83bf042f
NC		 2098Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
2099{
7918f24d 2100 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 2101 PERL_UNUSED_ARG(sv);
7918f24d 2102
94f3782b
DM		 2103 /* during global destruction, mg_obj may already have been freed */
2104 if (PL_in_clean_all)
1ea47f64 2105 return 0;
94f3782b 2106
83bf042f
NC		 2107 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
2108
2109 if (mg) {
2110 /* arylen scalar holds a pointer back to the array, but doesn't own a
2111 reference. Hence the we (the array) are about to go away with it
2112 still pointing at us. Clear its pointer, else it would be pointing
2113 at free memory. See the comment in sv_magic about reference loops,
2114 and why it can't own a reference to us. */
2115 mg->mg_obj = 0;
2116 }
a0d0e21e
LW		 2117 return 0;
2118}
2119
2120int
864dbfa3 2121Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2122{
16eb5365 2123 SV* const lsv = LvTARG(sv);
96c2a8ff 2124 MAGIC * const found = mg_find_mglob(lsv);
7918f24d
NC		 2125
2126 PERL_ARGS_ASSERT_MAGIC_GETPOS;
16eb5365 2127 PERL_UNUSED_ARG(mg);
ac27b0f5 2128
6174b39a
FC		 2129 if (found && found->mg_len != -1) {
2130 STRLEN i = found->mg_len;
25fdce4a 2131 if (found->mg_flags & MGf_BYTES && DO_UTF8(lsv))
6174b39a
FC		 2132 i = sv_pos_b2u_flags(lsv, i, SV_GMAGIC|SV_CONST_RETURN);
2133 sv_setuv(sv, i);
a0d0e21e 2134 return 0;
a0d0e21e 2135 }
35995e5c 2136 sv_setsv(sv,NULL);
a0d0e21e
LW		 2137 return 0;
2138}
2139
2140int
864dbfa3 2141Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 2142{
16eb5365 2143 SV* const lsv = LvTARG(sv);
a0d0e21e
LW		 2144 SSize_t pos;
2145 STRLEN len;
c00206c8 2146 STRLEN ulen = 0;
53d44271 2147 MAGIC* found;
aec43834 2148 const char *s;
a0d0e21e 2149
7918f24d 2150 PERL_ARGS_ASSERT_MAGIC_SETPOS;
16eb5365 2151 PERL_UNUSED_ARG(mg);
ac27b0f5 2152
96c2a8ff 2153 found = mg_find_mglob(lsv);
3881461a 2154 if (!found) {
a0d0e21e
LW		 2155 if (!SvOK(sv))
2156 return 0;
96c2a8ff 2157 found = sv_magicext_mglob(lsv);
a0d0e21e
LW		 2158 }
2159 else if (!SvOK(sv)) {
3881461a 2160 found->mg_len = -1;
a0d0e21e
LW		 2161 return 0;
2162 }
aec43834 2163 s = SvPV_const(lsv, len);
a0d0e21e 2164
e1dccc0d 2165 pos = SvIV(sv);
a0ed51b3 2166
7e2040f0 2167 if (DO_UTF8(lsv)) {
aec43834 2168 ulen = sv_or_pv_len_utf8(lsv, s, len);
a0ed51b3
LW		 2169 if (ulen)
2170 len = ulen;
a0ed51b3
LW		 2171 }
2172
a0d0e21e
LW		 2173 if (pos < 0) {
2174 pos += len;
2175 if (pos < 0)
2176 pos = 0;
2177 }
eb160463 2178 else if (pos > (SSize_t)len)
a0d0e21e 2179 pos = len;
a0ed51b3 2180
3881461a 2181 found->mg_len = pos;
25fdce4a 2182 found->mg_flags &= ~(MGf_MINMATCH|MGf_BYTES);
a0d0e21e 2183
79072805
LW		 2184 return 0;
2185}
2186
2187int
864dbfa3 2188Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS		 2189{
2190 STRLEN len;
35a4481c 2191 SV * const lsv = LvTARG(sv);
b83604b4 2192 const char * const tmps = SvPV_const(lsv,len);
777f7c56
EB		 2193 STRLEN offs = LvTARGOFF(sv);
2194 STRLEN rem = LvTARGLEN(sv);
83f78d1a
FC		 2195 const bool negoff = LvFLAGS(sv) & 1;
2196 const bool negrem = LvFLAGS(sv) & 2;
7918f24d
NC		 2197
2198 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2199 PERL_UNUSED_ARG(mg);
6ff81951 2200
83f78d1a 2201 if (!translate_substr_offsets(
4ddea69a 2202 SvUTF8(lsv) ? sv_or_pv_len_utf8(lsv, tmps, len) : len,
83f78d1a
FC		 2203 negoff ? -(IV)offs : (IV)offs, !negoff,
2204 negrem ? -(IV)rem : (IV)rem, !negrem, &offs, &rem
2205 )) {
2206 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR), "substr outside of string");
2207 sv_setsv_nomg(sv, &PL_sv_undef);
2208 return 0;
2209 }
2210
9aa983d2 2211 if (SvUTF8(lsv))
4ddea69a 2212 offs = sv_or_pv_pos_u2b(lsv, tmps, offs, &rem);
1c900557 2213 sv_setpvn(sv, tmps + offs, rem);
9aa983d2 2214 if (SvUTF8(lsv))
2ef4b674 2215 SvUTF8_on(sv);
6ff81951
GS		 2216 return 0;
2217}
2218
2219int
864dbfa3 2220Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2221{
83f78d1a 2222 STRLEN len, lsv_len, oldtarglen, newtarglen;
5fcbf73d 2223 const char * const tmps = SvPV_const(sv, len);
dd374669 2224 SV * const lsv = LvTARG(sv);
777f7c56
EB		 2225 STRLEN lvoff = LvTARGOFF(sv);
2226 STRLEN lvlen = LvTARGLEN(sv);
83f78d1a
FC		 2227 const bool negoff = LvFLAGS(sv) & 1;
2228 const bool neglen = LvFLAGS(sv) & 2;
7918f24d
NC		 2229
2230 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2231 PERL_UNUSED_ARG(mg);
075a4a2b 2232
a74fb2cd
FC		 2233 SvGETMAGIC(lsv);
2234 if (SvROK(lsv))
2235 Perl_ck_warner(aTHX_ packWARN(WARN_SUBSTR),
2236 "Attempt to use reference as lvalue in substr"
2237 );
fc061ed8
FC		 2238 SvPV_force_nomg(lsv,lsv_len);
2239 if (SvUTF8(lsv)) lsv_len = sv_len_utf8_nomg(lsv);
83f78d1a
FC		 2240 if (!translate_substr_offsets(
2241 lsv_len,
2242 negoff ? -(IV)lvoff : (IV)lvoff, !negoff,
2243 neglen ? -(IV)lvlen : (IV)lvlen, !neglen, &lvoff, &lvlen
2244 ))
2245 Perl_croak(aTHX_ "substr outside of string");
2246 oldtarglen = lvlen;
1aa99e6b 2247 if (DO_UTF8(sv)) {
73a087f0 2248 sv_utf8_upgrade_nomg(lsv);
d931b1be 2249 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
a74fb2cd 2250 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
7a385470 2251 newtarglen = sv_or_pv_len_utf8(sv, tmps, len);
9aa983d2
JH		 2252 SvUTF8_on(lsv);
2253 }
0d336106 2254 else if (SvUTF8(lsv)) {
5fcbf73d 2255 const char *utf8;
d931b1be 2256 lvoff = sv_pos_u2b_flags(lsv, lvoff, &lvlen, SV_CONST_RETURN);
83f78d1a 2257 newtarglen = len;
5fcbf73d 2258 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
a74fb2cd 2259 sv_insert_flags(lsv, lvoff, lvlen, utf8, len, 0);
5fcbf73d 2260 Safefree(utf8);
1aa99e6b 2261 }
b76f3ce2 2262 else {
a74fb2cd 2263 sv_insert_flags(lsv, lvoff, lvlen, tmps, len, 0);
83f78d1a 2264 newtarglen = len;
b76f3ce2 2265 }
83f78d1a
FC		 2266 if (!neglen) LvTARGLEN(sv) = newtarglen;
2267 if (negoff) LvTARGOFF(sv) += newtarglen - oldtarglen;
b76f3ce2 2268
79072805
LW		 2269 return 0;
2270}
2271
2272int
864dbfa3 2273Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2274{
7918f24d 2275 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2276 PERL_UNUSED_ARG(sv);
9a9b5ec9
DM		 2277#ifdef NO_TAINT_SUPPORT
2278 PERL_UNUSED_ARG(mg);
2279#endif
7918f24d 2280
64ff300b 2281 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1) && IN_PERL_RUNTIME);
463ee0b2
LW		 2282 return 0;
2283}
2284
2285int
864dbfa3 2286Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2287{
7918f24d 2288 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2289 PERL_UNUSED_ARG(sv);
7918f24d 2290
b01e650a 2291 /* update taint status */
284167a5 2292 if (TAINT_get)
b01e650a
DM		 2293 mg->mg_len |= 1;
2294 else
2295 mg->mg_len &= ~1;
463ee0b2
LW		 2296 return 0;
2297}
2298
2299int
864dbfa3 2300Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2301{
35a4481c 2302 SV * const lsv = LvTARG(sv);
7918f24d
NC		 2303
2304 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2305 PERL_UNUSED_ARG(mg);
6ff81951 2306
2e9e14dd 2307 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
6ff81951 2308
6ff81951
GS		 2309 return 0;
2310}
2311
2312int
864dbfa3 2313Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2314{
7918f24d 2315 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2316 PERL_UNUSED_ARG(mg);
79072805
LW		 2317 do_vecset(sv); /* XXX slurp this routine */
2318 return 0;
2319}
2320
13733cde
FC		 2321SV *
2322Perl_defelem_target(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2323{
a0714e2c 2324 SV *targ = NULL;
13733cde
FC		 2325 PERL_ARGS_ASSERT_DEFELEM_TARGET;
2326 if (!mg) mg = mg_find(sv, PERL_MAGIC_defelem);
2327 assert(mg);
5f05dabc 2328 if (LvTARGLEN(sv)) {
68dc0745 2329 if (mg->mg_obj) {
8772537c 2330 SV * const ahv = LvTARG(sv);
85fbaab2 2331 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS		 2332 if (he)
2333 targ = HeVAL(he);
68dc0745 2334 }
bbfdc870 2335 else if (LvSTARGOFF(sv) >= 0) {
502c6561 2336 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2337 if (LvSTARGOFF(sv) <= AvFILL(av))
ca58dfd9
FC		 2338 {
2339 if (SvRMAGICAL(av)) {
2340 SV * const * const svp = av_fetch(av, LvSTARGOFF(sv), 0);
2341 targ = svp ? *svp : NULL;
2342 }
2343 else
bbfdc870 2344 targ = AvARRAY(av)[LvSTARGOFF(sv)];
ca58dfd9 2345 }
68dc0745 2346 }
46da273f 2347 if (targ && (targ != &PL_sv_undef)) {
68dc0745 2348 /* somebody else defined it for us */
2349 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2350 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745 2351 LvTARGLEN(sv) = 0;
2352 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2353 mg->mg_obj = NULL;
68dc0745 2354 mg->mg_flags &= ~MGf_REFCOUNTED;
2355 }
13733cde 2356 return targ;
5f05dabc 2357 }
71be2cbc 2358 else
13733cde
FC		 2359 return LvTARG(sv);
2360}
2361
2362int
2363Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
2364{
2365 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2366
2367 sv_setsv(sv, defelem_target(sv, mg));
71be2cbc 2368 return 0;
2369}
2370
2371int
864dbfa3 2372Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2373{
7918f24d 2374 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2375 PERL_UNUSED_ARG(mg);
71be2cbc 2376 if (LvTARGLEN(sv))
68dc0745 2377 vivify_defelem(sv);
2378 if (LvTARG(sv)) {
5f05dabc 2379 sv_setsv(LvTARG(sv), sv);
68dc0745 2380 SvSETMAGIC(LvTARG(sv));
2381 }
5f05dabc 2382 return 0;
2383}
2384
71be2cbc 2385void
864dbfa3 2386Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2387{
74e13ce4 2388 MAGIC *mg;
a0714e2c 2389 SV *value = NULL;
71be2cbc 2390
7918f24d
NC		 2391 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2392
14befaf4 2393 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2394 return;
68dc0745 2395 if (mg->mg_obj) {
8772537c 2396 SV * const ahv = LvTARG(sv);
85fbaab2 2397 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS		 2398 if (he)
2399 value = HeVAL(he);
3280af22 2400 if (!value || value == &PL_sv_undef)
be2597df 2401 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2402 }
bbfdc870
FC		 2403 else if (LvSTARGOFF(sv) < 0)
2404 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2405 else {
502c6561 2406 AV *const av = MUTABLE_AV(LvTARG(sv));
bbfdc870 2407 if ((I32)LvTARGLEN(sv) < 0 && LvSTARGOFF(sv) > AvFILL(av))
a0714e2c 2408 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2409 else {
bbfdc870 2410 SV* const * const svp = av_fetch(av, LvSTARGOFF(sv), TRUE);
031c6d82 2411 if (!svp || !(value = *svp))
bbfdc870 2412 Perl_croak(aTHX_ PL_no_aelem, LvSTARGOFF(sv));
68dc0745 2413 }
2414 }
b37c2d43 2415 SvREFCNT_inc_simple_void(value);
68dc0745 2416 SvREFCNT_dec(LvTARG(sv));
2417 LvTARG(sv) = value;
71be2cbc 2418 LvTARGLEN(sv) = 0;
68dc0745 2419 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2420 mg->mg_obj = NULL;
68dc0745 2421 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc 2422}
2423
2424int
864dbfa3 2425Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2426{
7918f24d 2427 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
5648c0ae
DM		 2428 Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
2429 return 0;
810b8aa5
GS		 2430}
2431
2432int
864dbfa3 2433Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2434{
7918f24d 2435 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2436 PERL_UNUSED_CONTEXT;
0177730e 2437 PERL_UNUSED_ARG(sv);
565764a8 2438 mg->mg_len = -1;
93a17b20
LW		 2439 return 0;
2440}
2441
2442int
864dbfa3 2443Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2444{
35a4481c 2445 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2446
7918f24d
NC		 2447 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2448
79072805 2449 if (uf && uf->uf_set)
24f81a43 2450 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW		 2451 return 0;
2452}
2453
c277df42 2454int
faf82a0b
AE		 2455Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2456{
488344d2 2457 const char type = mg->mg_type;
7918f24d
NC		 2458
2459 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2460
488344d2
NC		 2461 if (type == PERL_MAGIC_qr) {
2462 } else if (type == PERL_MAGIC_bm) {
2463 SvTAIL_off(sv);
2464 SvVALID_off(sv);
2465 } else {
2466 assert(type == PERL_MAGIC_fm);
488344d2
NC		 2467 }
2468 return sv_unmagic(sv, type);
faf82a0b
AE		 2469}
2470
7a4c00b4 2471#ifdef USE_LOCALE_COLLATE
79072805 2472int
864dbfa3 2473Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2474{
7918f24d
NC		 2475 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2476
bbce6d69 2477 /*
838b5b74 2478 * RenE<eacute> Descartes said "I think not."
bbce6d69 2479 * and vanished with a faint plop.
2480 */
96a5add6 2481 PERL_UNUSED_CONTEXT;
8772537c 2482 PERL_UNUSED_ARG(sv);
7a4c00b4 2483 if (mg->mg_ptr) {
2484 Safefree(mg->mg_ptr);
2485 mg->mg_ptr = NULL;
565764a8 2486 mg->mg_len = -1;
7a4c00b4 2487 }
bbce6d69 2488 return 0;
2489}
7a4c00b4 2490#endif /* USE_LOCALE_COLLATE */
bbce6d69 2491
7e8c5dac
HS		 2492/* Just clear the UTF-8 cache data. */
2493int
2494Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2495{
7918f24d 2496 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2497 PERL_UNUSED_CONTEXT;
8772537c 2498 PERL_UNUSED_ARG(sv);
7e8c5dac 2499 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2500 mg->mg_ptr = NULL;
7e8c5dac
HS		 2501 mg->mg_len = -1; /* The mg_len holds the len cache. */
2502 return 0;
2503}
2504
bbce6d69 2505int
9cce4f9a
FC		 2506Perl_magic_setlvref(pTHX_ SV *sv, MAGIC *mg)
2507{
9782ce69 2508 const char *bad = NULL;
9cce4f9a 2509 PERL_ARGS_ASSERT_MAGIC_SETLVREF;
26a50d99 2510 if (!SvROK(sv)) Perl_croak(aTHX_ "Assigned value is not a reference");
9782ce69
FC		 2511 switch (mg->mg_private & OPpLVREF_TYPE) {
2512 case OPpLVREF_SV:
2513 if (SvTYPE(SvRV(sv)) > SVt_PVLV)
2514 bad = " SCALAR";
2515 break;
2516 case OPpLVREF_AV:
2517 if (SvTYPE(SvRV(sv)) != SVt_PVAV)
2518 bad = "n ARRAY";
2519 break;
2520 case OPpLVREF_HV:
2521 if (SvTYPE(SvRV(sv)) != SVt_PVHV)
2522 bad = " HASH";
2523 break;
2524 case OPpLVREF_CV:
2525 if (SvTYPE(SvRV(sv)) != SVt_PVCV)
2526 bad = " CODE";
2527 }
2528 if (bad)
26a50d99 2529 /* diag_listed_as: Assigned value is not %s reference */
9782ce69 2530 Perl_croak(aTHX_ "Assigned value is not a%s reference", bad);
c146a62a
FC		 2531 switch (mg->mg_obj ? SvTYPE(mg->mg_obj) : 0) {
2532 case 0:
2533 {
2534 SV * const old = PAD_SV(mg->mg_len);
2535 PAD_SETSV(mg->mg_len, SvREFCNT_inc_NN(SvRV(sv)));
2536 SvREFCNT_dec(old);
2537 break;
2538 }
2539 case SVt_PVGV:
2540 gv_setref(mg->mg_obj, sv);
2541 SvSETMAGIC(mg->mg_obj);
6102323a
FC		 2542 break;
2543 case SVt_PVAV:
2544 av_store((AV *)mg->mg_obj, SvIV((SV *)mg->mg_ptr),
2545 SvREFCNT_inc_simple_NN(SvRV(sv)));
5f94141d
FC		 2546 break;
2547 case SVt_PVHV:
7fcb36d5
JH		 2548 (void)hv_store_ent((HV *)mg->mg_obj, (SV *)mg->mg_ptr,
2549 SvREFCNT_inc_simple_NN(SvRV(sv)), 0);
c146a62a 2550 }
d39c26a6
FC		 2551 if (mg->mg_flags & MGf_PERSIST)
2552 NOOP; /* This sv is in use as an iterator var and will be reused,
2553 so we must leave the magic. */
2554 else
2555 /* This sv could be returned by the assignment op, so clear the
2556 magic, as lvrefs are an implementation detail that must not be
2557 leaked to the user. */
2558 sv_unmagic(sv, PERL_MAGIC_lvref);
9cce4f9a
FC		 2559 return 0;
2560}
2561
2562int
864dbfa3 2563Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2564{
20b7effb 2565#ifdef USE_ITHREADS
97aff369 2566 dVAR;
20b7effb 2567#endif
eb578fdb
KW		 2568 const char *s;
2569 I32 paren;
2570 const REGEXP * rx;
79072805 2571 I32 i;
8990e307 2572 STRLEN len;
125b9982 2573 MAGIC *tmg;
2fdbfb4d 2574
7918f24d
NC		 2575 PERL_ARGS_ASSERT_MAGIC_SET;
2576
e91d8259 2577 if (!mg->mg_ptr) {
960b831f 2578 paren = mg->mg_len;
1e05feb3 2579 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
e91d8259 2580 setparen_got_rx:
2fdbfb4d 2581 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
1e05feb3 2582 } else {
2fdbfb4d
AB		 2583 /* Croak with a READONLY error when a numbered match var is
2584 * set without a previous pattern match. Unless it's C<local $1>
2585 */
e91d8259 2586 croakparen:
2fdbfb4d 2587 if (!PL_localizing) {
cb077ed2 2588 Perl_croak_no_modify();
2fdbfb4d
AB		 2589 }
2590 }
e91d8259
NC		 2591 return 0;
2592 }
2593
2594 switch (*mg->mg_ptr) {
748a9306 2595 case '\001': /* ^A */
f2da823f
FC		 2596 if (SvOK(sv)) sv_copypv(PL_bodytarget, sv);
2597 else SvOK_off(PL_bodytarget);
64eff8b7
DM		 2598 FmLINES(PL_bodytarget) = 0;
2599 if (SvPOK(PL_bodytarget)) {
2600 char *s = SvPVX(PL_bodytarget);
2601 while ( ((s = strchr(s, '\n'))) ) {
2602 FmLINES(PL_bodytarget)++;
2603 s++;
2604 }
2605 }
125b9982 2606 /* mg_set() has temporarily made sv non-magical */
284167a5 2607 if (TAINTING_get) {
125b9982
NT		 2608 if ((tmg = mg_find(sv,PERL_MAGIC_taint)) && tmg->mg_len & 1)
2609 SvTAINTED_on(PL_bodytarget);
2610 else
2611 SvTAINTED_off(PL_bodytarget);
2612 }
748a9306 2613 break;
49460fe6 2614 case '\003': /* ^C */
f2338a2e 2615 PL_minus_c = cBOOL(SvIV(sv));
49460fe6
NIS		 2616 break;
2617
79072805 2618 case '\004': /* ^D */
b4ab917c 2619#ifdef DEBUGGING
b83604b4 2620 s = SvPV_nolen_const(sv);
ddcf8bc1 2621 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS		 2622 if (DEBUG_x_TEST || DEBUG_B_TEST)
2623 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2624#else
38ab35f8 2625 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2626#endif
79072805 2627 break;
28f23441 2628 case '\005': /* ^E */
d0063567 2629 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2630#ifdef VMS
38ab35f8 2631 set_vaxc_errno(SvIV(sv));
e37778c2
NC		 2632#else
2633# ifdef WIN32
d0063567 2634 SetLastError( SvIV(sv) );
e37778c2
NC		 2635# else
2636# ifdef OS2
38ab35f8 2637 os2_setsyserrno(SvIV(sv));
e37778c2 2638# else
d0063567 2639 /* will anyone ever use this? */
38ab35f8 2640 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ		 2641# endif
2642# endif
22fae026 2643#endif
d0063567 2644 }
3e669301
KW		 2645 else {
2646 unsigned int offset = 1;
2647 bool lex = FALSE;
2648
2649 /* It may be the shadow variable ${E_NCODING} which has lexical
2650 * scope. See comments at Perl__get_encoding in this file */
2651 if (*(mg->mg_ptr + 1) == '_') {
199670db
FC		 2652 if (CopSTASH(PL_curcop) != get_hv("encoding::",0))
2653 Perl_croak_no_modify();
3e669301
KW		 2654 lex = TRUE;
2655 offset++;
2656 }
2657 if (strEQ(mg->mg_ptr + offset, "NCODING")) {
2658 if (lex) { /* Use the shadow global */
2659 SvREFCNT_dec(PL_lex_encoding);
2660 if (SvOK(sv) || SvGMAGICAL(sv)) {
2661 PL_lex_encoding = newSVsv(sv);
2662 }
2663 else {
2664 PL_lex_encoding = NULL;
2665 }
2666 }
2667 else { /* Use the regular global */
050e2cbf
KW		 2668 SvREFCNT_dec(PL_encoding);
2669 if (SvOK(sv) || SvGMAGICAL(sv)) {
d5b4785c
DIM		 2670 if (PL_localizing != 2) {
2671 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
2672 "Setting ${^ENCODING} is deprecated");
2673 }
050e2cbf
KW		 2674 PL_encoding = newSVsv(sv);
2675 }
2676 else {
2677 PL_encoding = NULL;
2678 }
2679 }
3e669301
KW		 2680 }
2681 }
d0063567 2682 break;
79072805 2683 case '\006': /* ^F */
38ab35f8 2684 PL_maxsysfd = SvIV(sv);
79072805 2685 break;
a0d0e21e 2686 case '\010': /* ^H */
38ab35f8 2687 PL_hints = SvIV(sv);
a0d0e21e 2688 break;
9d116dd7 2689 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2690 Safefree(PL_inplace);
bd61b366 2691 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2692 break;
d9bad346
FC		 2693 case '\016': /* ^N */
2694 if (PL_curpm && (rx = PM_GETRE(PL_curpm))
2695 && (paren = RX_LASTCLOSEPAREN(rx))) goto setparen_got_rx;
2696 goto croakparen;
28f23441 2697 case '\017': /* ^O */
ac27b0f5 2698 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2699 Safefree(PL_osname);
bd61b366 2700 PL_osname = NULL;
3511154c
DM		 2701 if (SvOK(sv)) {
2702 TAINT_PROPER("assigning to $^O");
2e0de35c 2703 PL_osname = savesvpv(sv);
3511154c 2704 }
ac27b0f5
NIS		 2705 }
2706 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC		 2707 STRLEN len;
2708 const char *const start = SvPV(sv, len);
b54fc2b6 2709 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2710 SV *tmp;
8b850bd5
NC		 2711
2712
2713 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2714 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC		 2715
2716 /* Opening for input is more common than opening for output, so
2717 ensure that hints for input are sooner on linked list. */
59cd0e26 2718 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z		 2719 SvUTF8(sv))
2720 : newSVpvs_flags("", SvUTF8(sv));
2721 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2722 mg_set(tmp);
8b850bd5 2723
f747ebd6
Z		 2724 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2725 SvUTF8(sv));
2726 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2727 mg_set(tmp);
ac27b0f5 2728 }
28f23441 2729 break;
79072805 2730 case '\020': /* ^P */
2fdbfb4d
AB		 2731 PL_perldb = SvIV(sv);
2732 if (PL_perldb && !PL_DBsingle)
2733 init_debugger();
9b9e0be4 2734 break;
79072805 2735 case '\024': /* ^T */
88e89b8a 2736#ifdef BIG_TIME
6b88bc9c 2737 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2738#else
38ab35f8 2739 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2740#endif
79072805 2741 break;
e07ea26a
NC		 2742 case '\025': /* ^UTF8CACHE */
2743 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2744 PL_utf8cache = (signed char) sv_2iv(sv);
2745 }
2746 break;
fde18df1 2747 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH		 2748 if (*(mg->mg_ptr+1) == '\0') {
2749 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2750 i = SvIV(sv);
ac27b0f5 2751 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2752 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2753 }
599cee73 2754 }
0a378802 2755 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2756 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
7e4f0450
FC		 2757 if (!SvPOK(sv)) {
2758 PL_compiling.cop_warnings = pWARN_STD;
d775746e
GS		 2759 break;
2760 }
f4fc7782 2761 {
b5477537 2762 STRLEN len, i;
d3a7d8c7 2763 int accumulate = 0 ;
f4fc7782 2764 int any_fatals = 0 ;
b83604b4 2765 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH		 2766 for (i = 0 ; i < len ; ++i) {
2767 accumulate |= ptr[i] ;
2768 any_fatals |= (ptr[i] & 0xAA) ;
2769 }
4243c432
NC		 2770 if (!accumulate) {
2771 if (!specialWARN(PL_compiling.cop_warnings))
2772 PerlMemShared_free(PL_compiling.cop_warnings);
2773 PL_compiling.cop_warnings = pWARN_NONE;
2774 }
72dc9ed5 2775 /* Yuck. I can't see how to abstract this: */
2f3f0b56
KW		 2776 else if (isWARN_on(
2777 ((STRLEN *)SvPV_nolen_const(sv)) - 1,
2778 WARN_ALL)
2779 && !any_fatals)
2780 {
4243c432
NC		 2781 if (!specialWARN(PL_compiling.cop_warnings))
2782 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH		 2783 PL_compiling.cop_warnings = pWARN_ALL;
2784 PL_dowarn |= G_WARN_ONCE ;
727405f8 2785 }
d3a7d8c7 2786 else {
72dc9ed5
NC		 2787 STRLEN len;
2788 const char *const p = SvPV_const(sv, len);
2789
2790 PL_compiling.cop_warnings
8ee4cf24 2791 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC		 2792 p, len);
2793
d3a7d8c7
GS		 2794 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2795 PL_dowarn |= G_WARN_ONCE ;
2796 }
f4fc7782 2797
d3a7d8c7 2798 }
4438c4b7 2799 }
971a9dd3 2800 }
79072805
LW		 2801 break;
2802 case '.':
3280af22
NIS		 2803 if (PL_localizing) {
2804 if (PL_localizing == 1)
7766f137 2805 SAVESPTR(PL_last_in_gv);
748a9306 2806 }
3280af22 2807 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2808 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW		 2809 break;
2810 case '^':
acbe1b9d
FC		 2811 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2812 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2813 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW		 2814 break;
2815 case '~':
acbe1b9d
FC		 2816 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2817 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2818 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW		 2819 break;
2820 case '=':
acbe1b9d 2821 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW		 2822 break;
2823 case '-':
acbe1b9d
FC		 2824 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
2825 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
099be4f1 2826 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW		 2827 break;
2828 case '%':
acbe1b9d 2829 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW		 2830 break;
2831 case '|':
4b65379b 2832 {
099be4f1 2833 IO * const io = GvIO(PL_defoutgv);
720f287d
AB		 2834 if(!io)
2835 break;
38ab35f8 2836 if ((SvIV(sv)) == 0)
4b65379b
CS		 2837 IoFLAGS(io) &= ~IOf_FLUSH;
2838 else {
2839 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2840 PerlIO *ofp = IoOFP(io);
2841 if (ofp)
2842 (void)PerlIO_flush(ofp);
2843 IoFLAGS(io) |= IOf_FLUSH;
2844 }
2845 }
79072805
LW		 2846 }
2847 break;
79072805 2848 case '/':
1ab48e3a
YO		 2849 {
2850 SV *tmpsv= sv;
2851 if (SvROK(sv)) {
2852 SV *referent= SvRV(sv);
2853 const char *reftype= sv_reftype(referent, 0);
2854 /* XXX: dodgy type check: This leaves me feeling dirty, but the alternative
2855 * is to copy pretty much the entire sv_reftype() into this routine, or to do
2856 * a full string comparison on the return of sv_reftype() both of which
2857 * make me feel worse! NOTE, do not modify this comment without reviewing the
2858 * corresponding comment in sv_reftype(). - Yves */
2859 if (reftype[0] == 'S' || reftype[0] == 'L') {
2860 IV val= SvIV(referent);
2861 if (val <= 0) {
2862 tmpsv= &PL_sv_undef;
ddc3d23f 2863 Perl_ck_warner_d(aTHX_ packWARN(WARN_DEPRECATED),
1ab48e3a
YO		 2864 "Setting $/ to a reference to %s as a form of slurp is deprecated, treating as undef",
2865 SvIV(SvRV(sv)) < 0 ? "a negative integer" : "zero"
2866 );
2867 }
2868 } else {
ee0ba734 2869 /* diag_listed_as: Setting $/ to %s reference is forbidden */
a48e4205
FC		 2870 Perl_croak(aTHX_ "Setting $/ to a%s %s reference is forbidden",
2871 *reftype == 'A' ? "n" : "", reftype);
1ab48e3a
YO		 2872 }
2873 }
b3a2acfa 2874 SvREFCNT_dec(PL_rs);
1ab48e3a 2875 PL_rs = newSVsv(tmpsv);
b3a2acfa 2876 }
79072805
LW		 2877 break;
2878 case '\\':
ef8d46e8 2879 SvREFCNT_dec(PL_ors_sv);
6bc2995b 2880 if (SvOK(sv)) {
7889fe52 2881 PL_ors_sv = newSVsv(sv);
009c130f 2882 }
e3c19b7b 2883 else {
a0714e2c 2884 PL_ors_sv = NULL;
e3c19b7b 2885 }
79072805 2886 break;
7d69d4a6
FC		 2887 case '[':
2888 if (SvIV(sv) != 0)
2889 Perl_croak(aTHX_ "Assigning non-zero to $[ is no longer possible");
2890 break;
79072805 2891 case '?':
ff0cee69 2892#ifdef COMPLEX_STATUS
6b88bc9c 2893 if (PL_localizing == 2) {
41cb7b2b 2894 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS		 2895 PL_statusvalue = LvTARGOFF(sv);
2896 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69 2897 }
2898 else
2899#endif
2900#ifdef VMSISH_STATUS
2901 if (VMSISH_STATUS)
fb38d079 2902 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69 2903 else
2904#endif
38ab35f8 2905 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW		 2906 break;
2907 case '!':
93189314
JH		 2908 {
2909#ifdef VMS
2910# define PERL_VMS_BANG vaxc$errno
2911#else
2912# define PERL_VMS_BANG 0
2913#endif
27329181 2914#if defined(WIN32) && ! defined(UNDER_CE)
c9beaf97
SH		 2915 SETERRNO(win32_get_errno(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0),
2916 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2917#else
91487cfc 2918 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314 2919 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
c9beaf97 2920#endif
93189314 2921 }
79072805
LW		 2922 break;
2923 case '<':
985213f2 2924 {
b469f1e0 2925 /* XXX $< currently silently ignores failures */
dfff4baf 2926 const Uid_t new_uid = SvUID(sv);
985213f2 2927 PL_delaymagic_uid = new_uid;
3280af22
NIS		 2928 if (PL_delaymagic) {
2929 PL_delaymagic |= DM_RUID;
79072805
LW		 2930 break; /* don't do magic till later */
2931 }
2932#ifdef HAS_SETRUID
b469f1e0 2933 PERL_UNUSED_RESULT(setruid(new_uid));
79072805
LW		 2934#else
2935#ifdef HAS_SETREUID
b469f1e0 2936 PERL_UNUSED_RESULT(setreuid(new_uid, (Uid_t)-1));
748a9306 2937#else
85e6fe83 2938#ifdef HAS_SETRESUID
b469f1e0 2939 PERL_UNUSED_RESULT(setresuid(new_uid, (Uid_t)-1, (Uid_t)-1));
79072805 2940#else
985213f2 2941 if (new_uid == PerlProc_geteuid()) { /* special case $< = $> */
75870ed3 2942#ifdef PERL_DARWIN
2943 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
985213f2 2944 if (new_uid != 0 && PerlProc_getuid() == 0)
b469f1e0 2945 PERL_UNUSED_RESULT(PerlProc_setuid(0));
75870ed3 2946#endif
b469f1e0 2947 PERL_UNUSED_RESULT(PerlProc_setuid(new_uid));
75870ed3 2948 } else {
cea2e8a9 2949 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2950 }
79072805
LW		 2951#endif
2952#endif
85e6fe83 2953#endif
79072805 2954 break;
985213f2 2955 }
79072805 2956 case '>':
985213f2 2957 {
b469f1e0 2958 /* XXX $> currently silently ignores failures */
dfff4baf 2959 const Uid_t new_euid = SvUID(sv);
985213f2 2960 PL_delaymagic_euid = new_euid;
3280af22
NIS		 2961 if (PL_delaymagic) {
2962 PL_delaymagic |= DM_EUID;
79072805
LW		 2963 break; /* don't do magic till later */
2964 }
2965#ifdef HAS_SETEUID
b469f1e0 2966 PERL_UNUSED_RESULT(seteuid(new_euid));
79072805
LW		 2967#else
2968#ifdef HAS_SETREUID
b469f1e0 2969 PERL_UNUSED_RESULT(setreuid((Uid_t)-1, new_euid));
85e6fe83
LW		 2970#else
2971#ifdef HAS_SETRESUID
b469f1e0 2972 PERL_UNUSED_RESULT(setresuid((Uid_t)-1, new_euid, (Uid_t)-1));
79072805 2973#else
985213f2 2974 if (new_euid == PerlProc_getuid()) /* special case $> = $< */
b469f1e0 2975 PERL_UNUSED_RESULT(PerlProc_setuid(new_euid));
a0d0e21e 2976 else {
cea2e8a9 2977 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2978 }
79072805
LW		 2979#endif
2980#endif
85e6fe83 2981#endif
79072805 2982 break;
985213f2 2983 }
79072805 2984 case '(':
985213f2 2985 {
b469f1e0 2986 /* XXX $( currently silently ignores failures */
dfff4baf 2987 const Gid_t new_gid = SvGID(sv);
985213f2 2988 PL_delaymagic_gid = new_gid;
3280af22
NIS		 2989 if (PL_delaymagic) {
2990 PL_delaymagic |= DM_RGID;
79072805
LW		 2991 break; /* don't do magic till later */
2992 }
2993#ifdef HAS_SETRGID
b469f1e0 2994 PERL_UNUSED_RESULT(setrgid(new_gid));
79072805
LW		 2995#else
2996#ifdef HAS_SETREGID
b469f1e0 2997 PERL_UNUSED_RESULT(setregid(new_gid, (Gid_t)-1));
85e6fe83
LW		 2998#else
2999#ifdef HAS_SETRESGID
b469f1e0 3000 PERL_UNUSED_RESULT(setresgid(new_gid, (Gid_t)-1, (Gid_t) -1));
79072805 3001#else
985213f2 3002 if (new_gid == PerlProc_getegid()) /* special case $( = $) */
b469f1e0 3003 PERL_UNUSED_RESULT(PerlProc_setgid(new_gid));
748a9306 3004 else {
cea2e8a9 3005 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 3006 }
79072805
LW		 3007#endif
3008#endif
85e6fe83 3009#endif
79072805 3010 break;
985213f2 3011 }
79072805 3012 case ')':
985213f2 3013 {
b469f1e0 3014 /* XXX $) currently silently ignores failures */
dfff4baf 3015 Gid_t new_egid;
5cd24f17 3016#ifdef HAS_SETGROUPS
3017 {
b83604b4 3018 const char *p = SvPV_const(sv, len);
757f63d8 3019 Groups_t *gary = NULL;
fdadaf77 3020 const char* endptr;
fb4089e0 3021#ifdef _SC_NGROUPS_MAX
3022 int maxgrp = sysconf(_SC_NGROUPS_MAX);
3023
3024 if (maxgrp < 0)
3025 maxgrp = NGROUPS;
3026#else
3027 int maxgrp = NGROUPS;
3028#endif
757f63d8
SP		 3029
3030 while (isSPACE(*p))
3031 ++p;
fdadaf77 3032 new_egid = (Gid_t)grok_atou(p, &endptr);
fb4089e0 3033 for (i = 0; i < maxgrp; ++i) {
fdadaf77
JH		 3034 if (endptr == NULL)
3035 break;
3036 p = endptr;
757f63d8
SP		 3037 while (isSPACE(*p))
3038 ++p;
3039 if (!*p)
3040 break;
fdadaf77 3041 if (!gary)
757f63d8
SP		 3042 Newx(gary, i + 1, Groups_t);
3043 else
3044 Renew(gary, i + 1, Groups_t);
fdadaf77 3045 gary[i] = (Groups_t)grok_atou(p, &endptr);
757f63d8
SP		 3046 }
3047 if (i)
b469f1e0 3048 PERL_UNUSED_RESULT(setgroups(i, gary));
f5a63d97 3049 Safefree(gary);
5cd24f17 3050 }
3051#else /* HAS_SETGROUPS */
dfff4baf 3052 new_egid = SvGID(sv);
5cd24f17 3053#endif /* HAS_SETGROUPS */
985213f2 3054 PL_delaymagic_egid = new_egid;
3280af22
NIS		 3055 if (PL_delaymagic) {
3056 PL_delaymagic |= DM_EGID;
79072805
LW		 3057 break; /* don't do magic till later */
3058 }
3059#ifdef HAS_SETEGID
b469f1e0 3060 PERL_UNUSED_RESULT(setegid(new_egid));
79072805
LW		 3061#else
3062#ifdef HAS_SETREGID
b469f1e0 3063 PERL_UNUSED_RESULT(setregid((Gid_t)-1, new_egid));
85e6fe83
LW		 3064#else
3065#ifdef HAS_SETRESGID
b469f1e0 3066 PERL_UNUSED_RESULT(setresgid((Gid_t)-1, new_egid, (Gid_t)-1));
79072805 3067#else
985213f2 3068 if (new_egid == PerlProc_getgid()) /* special case $) = $( */
b469f1e0 3069 PERL_UNUSED_RESULT(PerlProc_setgid(new_egid));
748a9306 3070 else {
cea2e8a9 3071 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 3072 }
79072805
LW		 3073#endif
3074#endif
85e6fe83 3075#endif
79072805 3076 break;
985213f2 3077 }
79072805 3078 case ':':
2d8e6c8d 3079 PL_chopset = SvPV_force(sv,len);
79072805 3080 break;
9cdac2a2
FC		 3081 case '$': /* $$ */
3082 /* Store the pid in mg->mg_obj so we can tell when a fork has
3083 occurred. mg->mg_obj points to *$ by default, so clear it. */
3084 if (isGV(mg->mg_obj)) {
3085 if (mg->mg_flags & MGf_REFCOUNTED) /* probably never true */
3086 SvREFCNT_dec(mg->mg_obj);
3087 mg->mg_flags |= MGf_REFCOUNTED;
3088 mg->mg_obj = newSViv((IV)PerlProc_getpid());
3089 }
3090 else sv_setiv(mg->mg_obj, (IV)PerlProc_getpid());
3091 break;
79072805 3092 case '0':
e2975953 3093 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS		 3094#ifdef HAS_SETPROCTITLE
3095 /* The BSDs don't show the argv[] in ps(1) output, they
3096 * show a string from the process struct and provide
3097 * the setproctitle() routine to manipulate that. */
a2722ac9 3098 if (PL_origalen != 1) {
b83604b4 3099 s = SvPV_const(sv, len);
98b76f99 3100# if __FreeBSD_version > 410001
9aad2c0e 3101 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS		 3102 * but not the "(perl) suffix from the ps(1)
3103 * output, because that's what ps(1) shows if the
3104 * argv[] is modified. */
6f2ad931 3105 setproctitle("-%s", s);
9aad2c0e 3106# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS		 3107 /* This doesn't really work if you assume that
3108 * $0 = 'foobar'; will wipe out 'perl' from the $0
3109 * because in ps(1) output the result will be like
3110 * sprintf("perl: %s (perl)", s)
3111 * I guess this is a security feature:
3112 * one (a user process) cannot get rid of the original name.
3113 * --jhi */
3114 setproctitle("%s", s);
3115# endif
3116 }
9d3968b2 3117#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 3118 if (PL_origalen != 1) {
17aa7f3d 3119 union pstun un;
b83604b4 3120 s = SvPV_const(sv, len);
6867be6d 3121 un.pst_command = (char *)s;
17aa7f3d
JH		 3122 pstat(PSTAT_SETCMD, un, len, 0, 0);
3123 }
9d3968b2 3124#else
2d2af554
GA		 3125 if (PL_origalen > 1) {
3126 /* PL_origalen is set in perl_parse(). */
3127 s = SvPV_force(sv,len);
3128 if (len >= (STRLEN)PL_origalen-1) {
3129 /* Longer than original, will be truncated. We assume that
3130 * PL_origalen bytes are available. */
3131 Copy(s, PL_origargv[0], PL_origalen-1, char);
3132 }
3133 else {
3134 /* Shorter than original, will be padded. */
235ac35d 3135#ifdef PERL_DARWIN
60777a0d
JH		 3136 /* Special case for Mac OS X: see [perl #38868] */
3137 const int pad = 0;
235ac35d 3138#else
8a89a4f1
MB		 3139 /* Is the space counterintuitive? Yes.
3140 * (You were expecting \0?)
3141 * Does it work? Seems to. (In Linux 2.4.20 at least.)
3142 * --jhi */
60777a0d 3143 const int pad = ' ';
235ac35d 3144#endif
60777a0d
JH		 3145 Copy(s, PL_origargv[0], len, char);
3146 PL_origargv[0][len] = 0;
3147 memset(PL_origargv[0] + len + 1,
3148 pad, PL_origalen - len - 1);
2d2af554
GA		 3149 }
3150 PL_origargv[0][PL_origalen-1] = 0;
3151 for (i = 1; i < PL_origargc; i++)
3152 PL_origargv[i] = 0;
7636ea95
AB		 3153#ifdef HAS_PRCTL_SET_NAME
3154 /* Set the legacy process name in addition to the POSIX name on Linux */
3155 if (prctl(PR_SET_NAME, (unsigned long)s, 0, 0, 0) != 0) {
3156 /* diag_listed_as: SKIPME */
3157 Perl_croak(aTHX_ "Can't set $0 with prctl(): %s", Strerror(errno));
3158 }
3159#endif
79072805 3160 }
9d3968b2 3161#endif
e2975953 3162 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW		 3163 break;
3164 }
3165 return 0;
3166}
3167
3168I32
84c7b88c
BF		 3169Perl_whichsig_sv(pTHX_ SV *sigsv)
3170{
3171 const char *sigpv;
3172 STRLEN siglen;
3173 PERL_ARGS_ASSERT_WHICHSIG_SV;
84c7b88c
BF		 3174 sigpv = SvPV_const(sigsv, siglen);
3175 return whichsig_pvn(sigpv, siglen);
3176}
3177
3178I32
3179Perl_whichsig_pv(pTHX_ const char *sig)
3180{
3181 PERL_ARGS_ASSERT_WHICHSIG_PV;
84c7b88c
BF		 3182 return whichsig_pvn(sig, strlen(sig));
3183}
3184
3185I32
3186Perl_whichsig_pvn(pTHX_ const char *sig, STRLEN len)
79072805 3187{
eb578fdb 3188 char* const* sigv;
7918f24d 3189
84c7b88c 3190 PERL_ARGS_ASSERT_WHICHSIG_PVN;
96a5add6 3191 PERL_UNUSED_CONTEXT;
79072805 3192
aadb217d 3193 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
84c7b88c 3194 if (strlen(*sigv) == len && memEQ(sig,*sigv, len))
aadb217d 3195 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805 3196#ifdef SIGCLD
84c7b88c 3197 if (memEQs(sig, len, "CHLD"))
79072805
LW		 3198 return SIGCLD;
3199#endif
3200#ifdef SIGCHLD
84c7b88c 3201 if (memEQs(sig, len, "CLD"))
79072805
LW		 3202 return SIGCHLD;
3203#endif
7f1236c0 3204 return -1;
79072805
LW		 3205}
3206
ecfc5424 3207Signal_t
1e82f5a6 3208#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b3dbdd48 3209Perl_sighandler(int sig, siginfo_t *sip, void *uap)
1e82f5a6
SH		 3210#else
3211Perl_sighandler(int sig)
3212#endif
79072805 3213{
1018e26f
NIS		 3214#ifdef PERL_GET_SIG_CONTEXT
3215 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 3216#else
cea2e8a9 3217 dTHX;
71d280e3 3218#endif
79072805 3219 dSP;
a0714e2c
SS		 3220 GV *gv = NULL;
3221 SV *sv = NULL;
8772537c 3222 SV * const tSv = PL_Sv;
601f1833 3223 CV *cv = NULL;
533c011a 3224 OP *myop = PL_op;
84902520 3225 U32 flags = 0;
8772537c 3226 XPV * const tXpv = PL_Xpv;
0c4d3b5e 3227 I32 old_ss_ix = PL_savestack_ix;
100c03aa 3228 SV *errsv_save = NULL;
71d280e3 3229
84902520 3230
727405f8 3231 if (!PL_psig_ptr[sig]) {
99ef548b 3232 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS		 3233 PL_sig_name[sig]);
3234 exit(sig);
3235 }
ff0cee69 3236
a0d63a7b
DM		 3237 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3238 /* Max number of items pushed there is 3*n or 4. We cannot fix
3239 infinity, so we fix 4 (in fact 5): */
3240 if (PL_savestack_ix + 15 <= PL_savestack_max) {
3241 flags |= 1;
3242 PL_savestack_ix += 5; /* Protect save in progress. */
3243 SAVEDESTRUCTOR_X(S_unwind_handler_stack, NULL);
3244 }
84902520 3245 }
84902520 3246 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 3247 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL		 3248 || SvTYPE(cv) != SVt_PVCV) {
3249 HV *st;
f2c0649b 3250 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 3251 }
84902520 3252
a0d0e21e 3253 if (!cv || !CvROOT(cv)) {
07c325bb 3254 const HEK * const hek = gv
1d6bb9ae
FC		 3255 ? GvENAME_HEK(gv)
3256 : cv && CvNAMED(cv)
3257 ? CvNAME_HEK(cv)
07c325bb
FC		 3258 : cv && CvGV(cv) ? GvENAME_HEK(CvGV(cv)) : NULL;
3259 if (hek)
3260 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3261 "SIG%s handler \"%"HEKf"\" not defined.\n",
3262 PL_sig_name[sig], hek);
3263 /* diag_listed_as: SIG%s handler "%s" not defined */
3264 else Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL),
3265 "SIG%s handler \"__ANON__\" not defined.\n",
3266 PL_sig_name[sig]);
00d579c5 3267 goto cleanup;
79072805
LW		 3268 }
3269
0c4d3b5e
DM		 3270 sv = PL_psig_name[sig]
3271 ? SvREFCNT_inc_NN(PL_psig_name[sig])
3272 : newSVpv(PL_sig_name[sig],0);
72048cfe 3273 flags |= 8;
0c4d3b5e
DM		 3274 SAVEFREESV(sv);
3275
a0d63a7b
DM		 3276 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG) {
3277 /* make sure our assumption about the size of the SAVEs are correct:
3278 * 3 for SAVEDESTRUCTOR_X, 2 for SAVEFREESV */
3279 assert(old_ss_ix + 2 + ((flags & 1) ? 3+5 : 0) == PL_savestack_ix);
3280 }
e336de0d 3281
e788e7d3 3282 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 3283 PUSHMARK(SP);
79072805 3284 PUSHs(sv);
8aad04aa
JH		 3285#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
3286 {
3287 struct sigaction oact;
3288
3289 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH		 3290 if (sip) {
3291 HV *sih = newHV();
ad64d0ec 3292 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH		 3293 /* The siginfo fields signo, code, errno, pid, uid,
3294 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC		 3295 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
3296 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 3297#if 0 /* XXX TODO: Configure scan for the existence of these, but even that does not help if the SA_SIGINFO is not implemented according to the spec. */
85771703
NC		 3298 hv_stores(sih, "errno", newSViv(sip->si_errno));
3299 hv_stores(sih, "status", newSViv(sip->si_status));
3300 hv_stores(sih, "uid", newSViv(sip->si_uid));
3301 hv_stores(sih, "pid", newSViv(sip->si_pid));
3302 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
3303 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 3304#endif
8aad04aa 3305 EXTEND(SP, 2);
ad64d0ec 3306 PUSHs(rv);
22f1178f 3307 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 3308 }
b4552a27 3309
8aad04aa
JH		 3310 }
3311 }
3312#endif
79072805 3313 PUTBACK;
a0d0e21e 3314
100c03aa
JL		 3315 errsv_save = newSVsv(ERRSV);
3316
ad64d0ec 3317 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 3318
d3acc0f7 3319 POPSTACK;
eed484f9
DD		 3320 {
3321 SV * const errsv = ERRSV;
3322 if (SvTRUE_NN(errsv)) {
3323 SvREFCNT_dec(errsv_save);
c22d665b 3324#ifndef PERL_MICRO
1b266415
NIS		 3325 /* Handler "died", for example to get out of a restart-able read().
3326 * Before we re-do that on its behalf re-enable the signal which was
3327 * blocked by the system when we entered.
3328 */
c22d665b 3329#ifdef HAS_SIGPROCMASK
d488af49 3330#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
eed484f9 3331 if (sip || uap)
c22d665b 3332#endif
eed484f9
DD		 3333 {
3334 sigset_t set;
3335 sigemptyset(&set);
3336 sigaddset(&set,sig);
3337 sigprocmask(SIG_UNBLOCK, &set, NULL);
3338 }
c22d665b 3339#else
eed484f9
DD		 3340 /* Not clear if this will work */
3341 (void)rsignal(sig, SIG_IGN);
3342 (void)rsignal(sig, PL_csighandlerp);
c22d665b
LT		 3343#endif
3344#endif /* !PERL_MICRO */
eed484f9
DD		 3345 die_sv(errsv);
3346 }
3347 else {
3348 sv_setsv(errsv, errsv_save);
3349 SvREFCNT_dec(errsv_save);
3350 }
100c03aa
JL		 3351 }
3352
00d579c5 3353cleanup:
0c4d3b5e
DM		 3354 /* pop any of SAVEFREESV, SAVEDESTRUCTOR_X and "save in progress" */
3355 PL_savestack_ix = old_ss_ix;
72048cfe 3356 if (flags & 8)
2357bae7 3357 SvREFCNT_dec_NN(sv);
533c011a 3358 PL_op = myop; /* Apparently not needed... */
ac27b0f5 3359
3280af22
NIS		 3360 PL_Sv = tSv; /* Restore global temporaries. */
3361 PL_Xpv = tXpv;
53bb94e2 3362 return;
79072805 3363}
4e35701f
NIS		 3364
3365
51371543 3366static void
8772537c 3367S_restore_magic(pTHX_ const void *p)
51371543 3368{
8772537c
AL		 3369 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
3370 SV* const sv = mgs->mgs_sv;
150b625d 3371 bool bumped;
51371543
GS		 3372
3373 if (!sv)
3374 return;
3375
4bac9ae4
CS		 3376 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv)) {
3377 SvTEMP_off(sv); /* if it's still magical, this value isn't temporary */
f8c7b90f 3378#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC		 3379 /* While magic was saved (and off) sv_setsv may well have seen
3380 this SV as a prime candidate for COW. */
3381 if (SvIsCOW(sv))
e424a81e 3382 sv_force_normal_flags(sv, 0);
f9701176 3383#endif
a623f893
FC		 3384 if (mgs->mgs_flags)
3385 SvFLAGS(sv) |= mgs->mgs_flags;
51371543
GS		 3386 else
3387 mg_magical(sv);
51371543
GS		 3388 }
3389
150b625d 3390 bumped = mgs->mgs_bumped;
51371543
GS		 3391 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3392
3393 /* If we're still on top of the stack, pop us off. (That condition
3394 * will be satisfied if restore_magic was called explicitly, but *not*
3395 * if it's being called via leave_scope.)
3396 * The reason for doing this is that otherwise, things like sv_2cv()
3397 * may leave alloc gunk on the savestack, and some code
3398 * (e.g. sighandler) doesn't expect that...
3399 */
3400 if (PL_savestack_ix == mgs->mgs_ss_ix)
3401 {
1be36ce0
NC		 3402 UV popval = SSPOPUV;
3403 assert(popval == SAVEt_DESTRUCTOR_X);
51371543 3404 PL_savestack_ix -= 2;
1be36ce0
NC		 3405 popval = SSPOPUV;
3406 assert((popval & SAVE_MASK) == SAVEt_ALLOC);
3407 PL_savestack_ix -= popval >> SAVE_TIGHT_SHIFT;
51371543 3408 }
150b625d
DM		 3409 if (bumped) {
3410 if (SvREFCNT(sv) == 1) {
3411 /* We hold the last reference to this SV, which implies that the
3412 SV was deleted as a side effect of the routines we called.
3413 So artificially keep it alive a bit longer.
3414 We avoid turning on the TEMP flag, which can cause the SV's
3415 buffer to get stolen (and maybe other stuff). */
150b625d 3416 sv_2mortal(sv);
4bac9ae4 3417 SvTEMP_off(sv);
8985fe98 3418 }
150b625d 3419 else
2357bae7 3420 SvREFCNT_dec_NN(sv); /* undo the inc in S_save_magic() */
8985fe98 3421 }
51371543
GS		 3422}
3423
0c4d3b5e
DM		 3424/* clean up the mess created by Perl_sighandler().
3425 * Note that this is only called during an exit in a signal handler;
3426 * a die is trapped by the call_sv() and the SAVEDESTRUCTOR_X manually
9a7f166c 3427 * skipped over. */
0c4d3b5e 3428
51371543 3429static void
8772537c 3430S_unwind_handler_stack(pTHX_ const void *p)
51371543 3431{
0c4d3b5e 3432 PERL_UNUSED_ARG(p);
7918f24d 3433
0c4d3b5e 3434 PL_savestack_ix -= 5; /* Unprotect save in progress. */
51371543 3435}
1018e26f 3436
66610fdd 3437/*
b3ca2e83
NC		 3438=for apidoc magic_sethint
3439
3440Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC		 3441C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3442anything that would need a deep copy. Maybe we should warn if we find a
3443reference.
b3ca2e83
NC		 3444
3445=cut
3446*/
3447int
3448Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3449{
ad64d0ec 3450 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3451 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3452
7918f24d
NC		 3453 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3454
e6e3e454
NC		 3455 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3456 an alternative leaf in there, with PL_compiling.cop_hints being used if
3457 it's NULL. If needed for threads, the alternative could lock a mutex,
3458 or take other more complex action. */
3459
5b9c0671
NC		 3460 /* Something changed in %^H, so it will need to be restored on scope exit.
3461 Doing this here saves a lot of doing it manually in perl code (and
3462 forgetting to do it, and consequent subtle errors. */
3463 PL_hints |= HINT_LOCALIZE_HH;
20439bc7
Z		 3464 CopHINTHASH_set(&PL_compiling,
3465 cophh_store_sv(CopHINTHASH_get(&PL_compiling), key, 0, sv, 0));
b3ca2e83
NC		 3466 return 0;
3467}
3468
3469/*
f175cff5 3470=for apidoc magic_clearhint
b3ca2e83 3471
c28fe1ec
NC		 3472Triggered by a delete from %^H, records the key to
3473C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC		 3474
3475=cut
3476*/
3477int
3478Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3479{
7918f24d 3480 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL		 3481 PERL_UNUSED_ARG(sv);
3482
5b9c0671 3483 PL_hints |= HINT_LOCALIZE_HH;
20439bc7 3484 CopHINTHASH_set(&PL_compiling,
e3352591
FC		 3485 mg->mg_len == HEf_SVKEY
3486 ? cophh_delete_sv(CopHINTHASH_get(&PL_compiling),
3487 MUTABLE_SV(mg->mg_ptr), 0, 0)
3488 : cophh_delete_pvn(CopHINTHASH_get(&PL_compiling),
3489 mg->mg_ptr, mg->mg_len, 0, 0));
b3ca2e83
NC		 3490 return 0;
3491}
3492
3493/*
f747ebd6
Z		 3494=for apidoc magic_clearhints
3495
3496Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3497
3498=cut
3499*/
3500int
3501Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3502{
3503 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3504 PERL_UNUSED_ARG(sv);
3505 PERL_UNUSED_ARG(mg);
20439bc7
Z		 3506 cophh_free(CopHINTHASH_get(&PL_compiling));
3507 CopHINTHASH_set(&PL_compiling, cophh_new_empty());
f747ebd6
Z		 3508 return 0;
3509}
3510
09fb282d
FC		 3511int
3512Perl_magic_copycallchecker(pTHX_ SV *sv, MAGIC *mg, SV *nsv,
3513 const char *name, I32 namlen)
3514{
3515 MAGIC *nmg;
3516
3517 PERL_ARGS_ASSERT_MAGIC_COPYCALLCHECKER;
4f8dbb2d 3518 PERL_UNUSED_ARG(sv);
09fb282d
FC		 3519 PERL_UNUSED_ARG(name);
3520 PERL_UNUSED_ARG(namlen);
3521
3522 sv_magic(nsv, &PL_sv_undef, mg->mg_type, NULL, 0);
3523 nmg = mg_find(nsv, mg->mg_type);
316ebaf2 3524 assert(nmg);
09fb282d
FC		 3525 if (nmg->mg_flags & MGf_REFCOUNTED) SvREFCNT_dec(nmg->mg_obj);
3526 nmg->mg_ptr = mg->mg_ptr;
3527 nmg->mg_obj = SvREFCNT_inc_simple(mg->mg_obj);
3528 nmg->mg_flags |= MGf_REFCOUNTED;
3529 return 1;
3530}
3531
a6d69523
TC		 3532int
3533Perl_magic_setdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3534 PERL_ARGS_ASSERT_MAGIC_SETDEBUGVAR;
3535
23270f96
DM		 3536#if DBVARMG_SINGLE != 0
3537 assert(mg->mg_private >= DBVARMG_SINGLE);
3538#endif
3539 assert(mg->mg_private < DBVARMG_COUNT);
a6d69523
TC		 3540
3541 PL_DBcontrol[mg->mg_private] = SvIV_nomg(sv);
3542
3543 return 1;
3544}
3545
3546int
3547Perl_magic_getdebugvar(pTHX_ SV *sv, MAGIC *mg) {
3548 PERL_ARGS_ASSERT_MAGIC_GETDEBUGVAR;
3549
23270f96
DM		 3550#if DBVARMG_SINGLE != 0
3551 assert(mg->mg_private >= DBVARMG_SINGLE);
3552#endif
3553 assert(mg->mg_private < DBVARMG_COUNT);
a6d69523
TC		 3554 sv_setiv(sv, PL_DBcontrol[mg->mg_private]);
3555
3556 return 0;
3557}
3558
f747ebd6 3559/*
66610fdd
RGS		 3560 * Local variables:
3561 * c-indentation-style: bsd
3562 * c-basic-offset: 4
14d04a33 3563 * indent-tabs-mode: nil
66610fdd
RGS		 3564 * End:
3565 *
14d04a33 3566 * ex: set ts=8 sts=4 sw=4 et:
37442d52 3567 */
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