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a0d0e21e 1/* mg.c
79072805 2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
4ac71550
TC
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
14 *
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
79072805
LW
16 */
17
ccfc67b7
JH
18/*
19=head1 Magical Functions
166f8a29
DM
20
21"Magic" is special data attached to SV structures in order to give them
22"magical" properties. When any Perl code tries to read from, or assign to,
23an SV marked as magical, it calls the 'get' or 'set' function associated
24with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 25give it a chance to update its internal value (get on $. writes the line
166f8a29
DM
26number of the last read filehandle into to the SV's IV slot), while
27set is called after an SV has been written to, in order to allow it to make
ddfa107c 28use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
29PL_rs global variable).
30
31Magic is implemented as a linked list of MAGIC structures attached to the
32SV. Each MAGIC struct holds the type of the magic, a pointer to an array
33of functions that implement the get(), set(), length() etc functions,
34plus space for some flags and pointers. For example, a tied variable has
35a MAGIC structure that contains a pointer to the object associated with the
36tie.
37
ccfc67b7
JH
38*/
39
79072805 40#include "EXTERN.h"
864dbfa3 41#define PERL_IN_MG_C
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LW
42#include "perl.h"
43
5cd24f17 44#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
45# ifdef I_GRP
46# include <grp.h>
47# endif
188ea221
CS
48#endif
49
757f63d8
SP
50#if defined(HAS_SETGROUPS)
51# ifndef NGROUPS
52# define NGROUPS 32
53# endif
54#endif
55
17aa7f3d
JH
56#ifdef __hpux
57# include <sys/pstat.h>
58#endif
59
8aad04aa 60#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 61Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 62#else
e69880a5 63Signal_t Perl_csighandler(int sig);
8aad04aa 64#endif
e69880a5 65
9cffb111
OS
66#ifdef __Lynx__
67/* Missing protos on LynxOS */
68void setruid(uid_t id);
69void seteuid(uid_t id);
70void setrgid(uid_t id);
71void setegid(uid_t id);
72#endif
73
c07a80fd
PP
74/*
75 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
76 */
77
78struct magic_state {
79 SV* mgs_sv;
80 U32 mgs_flags;
455ece5e 81 I32 mgs_ss_ix;
c07a80fd 82};
455ece5e 83/* MGS is typedef'ed to struct magic_state in perl.h */
76e3520e
GS
84
85STATIC void
8fb26106 86S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
c07a80fd 87{
97aff369 88 dVAR;
455ece5e 89 MGS* mgs;
7918f24d
NC
90
91 PERL_ARGS_ASSERT_SAVE_MAGIC;
92
c07a80fd 93 assert(SvMAGICAL(sv));
d8b2590f
NC
94 /* Turning READONLY off for a copy-on-write scalar (including shared
95 hash keys) is a bad idea. */
765f542d 96 if (SvIsCOW(sv))
9a265e59 97 sv_force_normal_flags(sv, 0);
c07a80fd 98
8772537c 99 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
100
101 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd
PP
102 mgs->mgs_sv = sv;
103 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
455ece5e 104 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
c07a80fd
PP
105
106 SvMAGICAL_off(sv);
107 SvREADONLY_off(sv);
085bde85
NC
108 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
109 /* No public flags are set, so promote any private flags to public. */
110 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
111 }
c07a80fd
PP
112}
113
954c1994
GS
114/*
115=for apidoc mg_magical
116
117Turns on the magical status of an SV. See C<sv_magic>.
118
119=cut
120*/
121
8990e307 122void
864dbfa3 123Perl_mg_magical(pTHX_ SV *sv)
8990e307 124{
e1ec3a88 125 const MAGIC* mg;
7918f24d 126 PERL_ARGS_ASSERT_MG_MAGICAL;
96a5add6 127 PERL_UNUSED_CONTEXT;
218787bd
VP
128 if ((mg = SvMAGIC(sv))) {
129 SvRMAGICAL_off(sv);
130 do {
131 const MGVTBL* const vtbl = mg->mg_virtual;
132 if (vtbl) {
133 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
134 SvGMAGICAL_on(sv);
135 if (vtbl->svt_set)
136 SvSMAGICAL_on(sv);
137 if (vtbl->svt_clear)
138 SvRMAGICAL_on(sv);
139 }
140 } while ((mg = mg->mg_moremagic));
141 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
142 SvRMAGICAL_on(sv);
8990e307
LW
143 }
144}
145
2767dea0
DM
146
147/* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
148
149STATIC bool
150S_is_container_magic(const MAGIC *mg)
151{
7918f24d 152 assert(mg);
2767dea0
DM
153 switch (mg->mg_type) {
154 case PERL_MAGIC_bm:
155 case PERL_MAGIC_fm:
156 case PERL_MAGIC_regex_global:
157 case PERL_MAGIC_nkeys:
158#ifdef USE_LOCALE_COLLATE
159 case PERL_MAGIC_collxfrm:
160#endif
161 case PERL_MAGIC_qr:
162 case PERL_MAGIC_taint:
163 case PERL_MAGIC_vec:
164 case PERL_MAGIC_vstring:
165 case PERL_MAGIC_utf8:
166 case PERL_MAGIC_substr:
167 case PERL_MAGIC_defelem:
168 case PERL_MAGIC_arylen:
169 case PERL_MAGIC_pos:
170 case PERL_MAGIC_backref:
171 case PERL_MAGIC_arylen_p:
172 case PERL_MAGIC_rhash:
173 case PERL_MAGIC_symtab:
174 return 0;
175 default:
176 return 1;
177 }
178}
179
954c1994
GS
180/*
181=for apidoc mg_get
182
183Do magic after a value is retrieved from the SV. See C<sv_magic>.
184
185=cut
186*/
187
79072805 188int
864dbfa3 189Perl_mg_get(pTHX_ SV *sv)
79072805 190{
97aff369 191 dVAR;
35a4481c 192 const I32 mgs_ix = SSNEW(sizeof(MGS));
fe2774ed 193 const bool was_temp = (bool)SvTEMP(sv);
0723351e 194 int have_new = 0;
ff76feab 195 MAGIC *newmg, *head, *cur, *mg;
20135930 196 /* guard against sv having being freed midway by holding a private
6683b158
NC
197 reference. */
198
7918f24d
NC
199 PERL_ARGS_ASSERT_MG_GET;
200
6683b158
NC
201 /* sv_2mortal has this side effect of turning on the TEMP flag, which can
202 cause the SV's buffer to get stolen (and maybe other stuff).
203 So restore it.
204 */
46da273f 205 sv_2mortal(SvREFCNT_inc_simple_NN(sv));
6683b158
NC
206 if (!was_temp) {
207 SvTEMP_off(sv);
208 }
209
455ece5e 210 save_magic(mgs_ix, sv);
463ee0b2 211
ff76feab
AMS
212 /* We must call svt_get(sv, mg) for each valid entry in the linked
213 list of magic. svt_get() may delete the current entry, add new
214 magic to the head of the list, or upgrade the SV. AMS 20010810 */
215
216 newmg = cur = head = mg = SvMAGIC(sv);
217 while (mg) {
35a4481c 218 const MGVTBL * const vtbl = mg->mg_virtual;
ff76feab 219
2b260de0 220 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
316ad4fe 221 CALL_FPTR(vtbl->svt_get)(aTHX_ sv, mg);
b77f7d40 222
58f82c5c
DM
223 /* guard against magic having been deleted - eg FETCH calling
224 * untie */
225 if (!SvMAGIC(sv))
226 break;
b77f7d40 227
ff76feab
AMS
228 /* Don't restore the flags for this entry if it was deleted. */
229 if (mg->mg_flags & MGf_GSKIP)
230 (SSPTR(mgs_ix, MGS *))->mgs_flags = 0;
a0d0e21e 231 }
ff76feab
AMS
232
233 mg = mg->mg_moremagic;
234
0723351e 235 if (have_new) {
ff76feab
AMS
236 /* Have we finished with the new entries we saw? Start again
237 where we left off (unless there are more new entries). */
238 if (mg == head) {
0723351e 239 have_new = 0;
ff76feab
AMS
240 mg = cur;
241 head = newmg;
242 }
243 }
244
245 /* Were any new entries added? */
0723351e
NC
246 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
247 have_new = 1;
ff76feab
AMS
248 cur = mg;
249 mg = newmg;
760ac839 250 }
79072805 251 }
463ee0b2 252
8772537c 253 restore_magic(INT2PTR(void *, (IV)mgs_ix));
6683b158
NC
254
255 if (SvREFCNT(sv) == 1) {
256 /* We hold the last reference to this SV, which implies that the
257 SV was deleted as a side effect of the routines we called. */
0c34ef67 258 SvOK_off(sv);
6683b158 259 }
79072805
LW
260 return 0;
261}
262
954c1994
GS
263/*
264=for apidoc mg_set
265
266Do magic after a value is assigned to the SV. See C<sv_magic>.
267
268=cut
269*/
270
79072805 271int
864dbfa3 272Perl_mg_set(pTHX_ SV *sv)
79072805 273{
97aff369 274 dVAR;
35a4481c 275 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 276 MAGIC* mg;
463ee0b2
LW
277 MAGIC* nextmg;
278
7918f24d
NC
279 PERL_ARGS_ASSERT_MG_SET;
280
455ece5e 281 save_magic(mgs_ix, sv);
463ee0b2
LW
282
283 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 284 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 285 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
286 if (mg->mg_flags & MGf_GSKIP) {
287 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
455ece5e 288 (SSPTR(mgs_ix, MGS*))->mgs_flags = 0;
a0d0e21e 289 }
e7cbf6c6
DM
290 if (PL_localizing == 2 && !S_is_container_magic(mg))
291 continue;
2b260de0 292 if (vtbl && vtbl->svt_set)
fc0dc3b3 293 CALL_FPTR(vtbl->svt_set)(aTHX_ sv, mg);
79072805 294 }
463ee0b2 295
8772537c 296 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
297 return 0;
298}
299
954c1994
GS
300/*
301=for apidoc mg_length
302
303Report on the SV's length. See C<sv_magic>.
304
305=cut
306*/
307
79072805 308U32
864dbfa3 309Perl_mg_length(pTHX_ SV *sv)
79072805 310{
97aff369 311 dVAR;
79072805 312 MAGIC* mg;
463ee0b2 313 STRLEN len;
463ee0b2 314
7918f24d
NC
315 PERL_ARGS_ASSERT_MG_LENGTH;
316
79072805 317 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 318 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 319 if (vtbl && vtbl->svt_len) {
35a4481c 320 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 321 save_magic(mgs_ix, sv);
a0d0e21e 322 /* omit MGf_GSKIP -- not changed here */
fc0dc3b3 323 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
8772537c 324 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
325 return len;
326 }
327 }
328
d0644529
NC
329 {
330 /* You can't know whether it's UTF-8 until you get the string again...
331 */
10516c54 332 const U8 *s = (U8*)SvPV_const(sv, len);
d0644529
NC
333
334 if (DO_UTF8(sv)) {
335 len = utf8_length(s, s + len);
336 }
5636d518 337 }
463ee0b2 338 return len;
79072805
LW
339}
340
8fb26106 341I32
864dbfa3 342Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
343{
344 MAGIC* mg;
ac27b0f5 345
7918f24d
NC
346 PERL_ARGS_ASSERT_MG_SIZE;
347
93965878 348 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 349 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 350 if (vtbl && vtbl->svt_len) {
35a4481c
AL
351 const I32 mgs_ix = SSNEW(sizeof(MGS));
352 I32 len;
455ece5e 353 save_magic(mgs_ix, sv);
93965878 354 /* omit MGf_GSKIP -- not changed here */
fc0dc3b3 355 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
8772537c 356 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
357 return len;
358 }
359 }
360
361 switch(SvTYPE(sv)) {
362 case SVt_PVAV:
502c6561 363 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
364 case SVt_PVHV:
365 /* FIXME */
366 default:
cea2e8a9 367 Perl_croak(aTHX_ "Size magic not implemented");
93965878
NIS
368 break;
369 }
370 return 0;
371}
372
954c1994
GS
373/*
374=for apidoc mg_clear
375
376Clear something magical that the SV represents. See C<sv_magic>.
377
378=cut
379*/
380
79072805 381int
864dbfa3 382Perl_mg_clear(pTHX_ SV *sv)
79072805 383{
35a4481c 384 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 385 MAGIC* mg;
8ac77ac9 386 MAGIC *nextmg;
463ee0b2 387
7918f24d
NC
388 PERL_ARGS_ASSERT_MG_CLEAR;
389
455ece5e 390 save_magic(mgs_ix, sv);
463ee0b2 391
8ac77ac9 392 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
35a4481c 393 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 394 /* omit GSKIP -- never set here */
727405f8 395
8ac77ac9
NC
396 nextmg = mg->mg_moremagic; /* it may delete itself */
397
2b260de0 398 if (vtbl && vtbl->svt_clear)
fc0dc3b3 399 CALL_FPTR(vtbl->svt_clear)(aTHX_ sv, mg);
79072805 400 }
463ee0b2 401
8772537c 402 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
403 return 0;
404}
405
954c1994
GS
406/*
407=for apidoc mg_find
408
409Finds the magic pointer for type matching the SV. See C<sv_magic>.
410
411=cut
412*/
413
93a17b20 414MAGIC*
35a4481c 415Perl_mg_find(pTHX_ const SV *sv, int type)
93a17b20 416{
96a5add6 417 PERL_UNUSED_CONTEXT;
35a4481c
AL
418 if (sv) {
419 MAGIC *mg;
420 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
421 if (mg->mg_type == type)
422 return mg;
423 }
93a17b20 424 }
5f66b61c 425 return NULL;
93a17b20
LW
426}
427
954c1994
GS
428/*
429=for apidoc mg_copy
430
431Copies the magic from one SV to another. See C<sv_magic>.
432
433=cut
434*/
435
79072805 436int
864dbfa3 437Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 438{
463ee0b2 439 int count = 0;
79072805 440 MAGIC* mg;
7918f24d
NC
441
442 PERL_ARGS_ASSERT_MG_COPY;
443
463ee0b2 444 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 445 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93
NIS
446 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
447 count += CALL_FPTR(vtbl->svt_copy)(aTHX_ sv, mg, nsv, key, klen);
448 }
823a54a3
AL
449 else {
450 const char type = mg->mg_type;
1e73acc8 451 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
452 sv_magic(nsv,
453 (type == PERL_MAGIC_tied)
454 ? SvTIED_obj(sv, mg)
455 : (type == PERL_MAGIC_regdata && mg->mg_obj)
456 ? sv
457 : mg->mg_obj,
458 toLOWER(type), key, klen);
459 count++;
460 }
79072805 461 }
79072805 462 }
463ee0b2 463 return count;
79072805
LW
464}
465
954c1994 466/*
0cbee0a4
DM
467=for apidoc mg_localize
468
9711599e
CS
469Copy some of the magic from an existing SV to new localized version of that
470SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
471taint, pos).
472
af7df257 473If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS
474This typically means that assignment will soon follow (e.g. 'local $x = $y'),
475and that will handle the magic.
0cbee0a4
DM
476
477=cut
478*/
479
480void
af7df257 481Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4 482{
97aff369 483 dVAR;
0cbee0a4 484 MAGIC *mg;
7918f24d
NC
485
486 PERL_ARGS_ASSERT_MG_LOCALIZE;
487
0cbee0a4 488 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 489 const MGVTBL* const vtbl = mg->mg_virtual;
2767dea0 490 if (!S_is_container_magic(mg))
0cbee0a4 491 continue;
0cbee0a4 492
a5063e7c
DM
493 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
494 (void)CALL_FPTR(vtbl->svt_local)(aTHX_ nsv, mg);
495 else
0cbee0a4
DM
496 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
497 mg->mg_ptr, mg->mg_len);
a5063e7c 498
0cbee0a4
DM
499 /* container types should remain read-only across localization */
500 SvFLAGS(nsv) |= SvREADONLY(sv);
501 }
502
503 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
504 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 505 if (setmagic) {
9711599e
CS
506 PL_localizing = 1;
507 SvSETMAGIC(nsv);
508 PL_localizing = 0;
509 }
0cbee0a4
DM
510 }
511}
512
513/*
954c1994
GS
514=for apidoc mg_free
515
516Free any magic storage used by the SV. See C<sv_magic>.
517
518=cut
519*/
520
79072805 521int
864dbfa3 522Perl_mg_free(pTHX_ SV *sv)
79072805
LW
523{
524 MAGIC* mg;
525 MAGIC* moremagic;
7918f24d
NC
526
527 PERL_ARGS_ASSERT_MG_FREE;
528
79072805 529 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
35a4481c 530 const MGVTBL* const vtbl = mg->mg_virtual;
79072805 531 moremagic = mg->mg_moremagic;
2b260de0 532 if (vtbl && vtbl->svt_free)
fc0dc3b3 533 CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg);
14befaf4 534 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
979acdb5 535 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
88e89b8a 536 Safefree(mg->mg_ptr);
565764a8 537 else if (mg->mg_len == HEf_SVKEY)
ad64d0ec 538 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
d460ef45 539 }
b881518d
JH
540 if (mg->mg_flags & MGf_REFCOUNTED)
541 SvREFCNT_dec(mg->mg_obj);
79072805 542 Safefree(mg);
c826f41b 543 SvMAGIC_set(sv, moremagic);
79072805 544 }
b162af07 545 SvMAGIC_set(sv, NULL);
68f8932e 546 SvMAGICAL_off(sv);
79072805
LW
547 return 0;
548}
549
79072805 550#include <signal.h>
79072805 551
942e002e 552U32
864dbfa3 553Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 554{
97aff369 555 dVAR;
8772537c 556 PERL_UNUSED_ARG(sv);
6cef1e77 557
7918f24d
NC
558 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
559
0bd48802
AL
560 if (PL_curpm) {
561 register const REGEXP * const rx = PM_GETRE(PL_curpm);
562 if (rx) {
a678b0e4
YO
563 if (mg->mg_obj) { /* @+ */
564 /* return the number possible */
07bc277f 565 return RX_NPARENS(rx);
a678b0e4 566 } else { /* @- */
07bc277f 567 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
568
569 /* return the last filled */
f46c4081 570 while ( paren >= 0
07bc277f
NC
571 && (RX_OFFS(rx)[paren].start == -1
572 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 573 paren--;
a678b0e4
YO
574 return (U32)paren;
575 }
0bd48802 576 }
8f580fb8 577 }
ac27b0f5 578
942e002e 579 return (U32)-1;
6cef1e77
IZ
580}
581
582int
864dbfa3 583Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 584{
97aff369 585 dVAR;
7918f24d
NC
586
587 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
588
0bd48802
AL
589 if (PL_curpm) {
590 register const REGEXP * const rx = PM_GETRE(PL_curpm);
591 if (rx) {
592 register const I32 paren = mg->mg_len;
593 register I32 s;
594 register I32 t;
595 if (paren < 0)
596 return 0;
07bc277f
NC
597 if (paren <= (I32)RX_NPARENS(rx) &&
598 (s = RX_OFFS(rx)[paren].start) != -1 &&
599 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802
AL
600 {
601 register I32 i;
602 if (mg->mg_obj) /* @+ */
603 i = t;
604 else /* @- */
605 i = s;
606
607 if (i > 0 && RX_MATCH_UTF8(rx)) {
07bc277f 608 const char * const b = RX_SUBBEG(rx);
0bd48802 609 if (b)
f5a63d97 610 i = utf8_length((U8*)b, (U8*)(b+i));
0bd48802 611 }
727405f8 612
0bd48802 613 sv_setiv(sv, i);
1aa99e6b 614 }
0bd48802 615 }
6cef1e77
IZ
616 }
617 return 0;
618}
619
e4b89193 620int
a29d06ed
MG
621Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
622{
7918f24d 623 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
d4c19fe8
AL
624 PERL_UNUSED_ARG(sv);
625 PERL_UNUSED_ARG(mg);
f1f66076 626 Perl_croak(aTHX_ "%s", PL_no_modify);
0dbb1585 627 NORETURN_FUNCTION_END;
a29d06ed
MG
628}
629
93a17b20 630U32
864dbfa3 631Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
93a17b20 632{
97aff369 633 dVAR;
93a17b20 634 register I32 paren;
93a17b20 635 register I32 i;
2fdbfb4d
AB
636 register const REGEXP * rx;
637 const char * const remaining = mg->mg_ptr + 1;
93a17b20 638
7918f24d
NC
639 PERL_ARGS_ASSERT_MAGIC_LEN;
640
93a17b20 641 switch (*mg->mg_ptr) {
2fdbfb4d
AB
642 case '\020':
643 if (*remaining == '\0') { /* ^P */
644 break;
645 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
646 goto do_prematch;
647 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
648 goto do_postmatch;
649 }
650 break;
651 case '\015': /* $^MATCH */
652 if (strEQ(remaining, "ATCH")) {
653 goto do_match;
654 } else {
655 break;
656 }
657 case '`':
658 do_prematch:
f1b875a0 659 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB
660 goto maybegetparen;
661 case '\'':
662 do_postmatch:
f1b875a0 663 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB
664 goto maybegetparen;
665 case '&':
666 do_match:
f1b875a0 667 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d 668 goto maybegetparen;
93a17b20 669 case '1': case '2': case '3': case '4':
2fdbfb4d
AB
670 case '5': case '6': case '7': case '8': case '9':
671 paren = atoi(mg->mg_ptr);
672 maybegetparen:
aaa362c4 673 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d
AB
674 getparen:
675 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
cf93c79d 676
ffc61ed2 677 if (i < 0)
0844c848 678 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
ffc61ed2 679 return i;
2fdbfb4d 680 } else {
235bddc8 681 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 682 report_uninit(sv);
2fdbfb4d 683 return 0;
93a17b20 684 }
93a17b20 685 case '+':
aaa362c4 686 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f 687 paren = RX_LASTPAREN(rx);
13f57bf8
CS
688 if (paren)
689 goto getparen;
93a17b20 690 }
748a9306 691 return 0;
a01268b5
JH
692 case '\016': /* ^N */
693 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f 694 paren = RX_LASTCLOSEPAREN(rx);
a01268b5
JH
695 if (paren)
696 goto getparen;
697 }
698 return 0;
93a17b20
LW
699 }
700 magic_get(sv,mg);
2d8e6c8d 701 if (!SvPOK(sv) && SvNIOK(sv)) {
8b6b16e7 702 sv_2pv(sv, 0);
2d8e6c8d 703 }
93a17b20
LW
704 if (SvPOK(sv))
705 return SvCUR(sv);
706 return 0;
707}
708
ad3296c6 709#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
710 if (SvPOK(sv)) { \
711 STRLEN len = SvCUR(sv); \
712 char * const p = SvPVX(sv); \
8e6b4db6
PC
713 while (len > 0 && isSPACE(p[len-1])) \
714 --len; \
715 SvCUR_set(sv, len); \
716 p[len] = '\0'; \
717 } \
ad3296c6
SH
718} STMT_END
719
8b850bd5
NC
720void
721Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
722{
7918f24d
NC
723 PERL_ARGS_ASSERT_EMULATE_COP_IO;
724
8b850bd5
NC
725 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
726 sv_setsv(sv, &PL_sv_undef);
727 else {
728 sv_setpvs(sv, "");
729 SvUTF8_off(sv);
730 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
731 SV *const value = Perl_refcounted_he_fetch(aTHX_
732 c->cop_hints_hash,
733 0, "open<", 5, 0, 0);
734 assert(value);
735 sv_catsv(sv, value);
736 }
737 sv_catpvs(sv, "\0");
738 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
739 SV *const value = Perl_refcounted_he_fetch(aTHX_
740 c->cop_hints_hash,
741 0, "open>", 5, 0, 0);
742 assert(value);
743 sv_catsv(sv, value);
744 }
745 }
746}
747
79072805 748int
864dbfa3 749Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 750{
27da23d5 751 dVAR;
79072805 752 register I32 paren;
35272f84 753 register char *s = NULL;
d9f97599 754 register REGEXP *rx;
823a54a3
AL
755 const char * const remaining = mg->mg_ptr + 1;
756 const char nextchar = *remaining;
79072805 757
7918f24d
NC
758 PERL_ARGS_ASSERT_MAGIC_GET;
759
79072805 760 switch (*mg->mg_ptr) {
748a9306 761 case '\001': /* ^A */
3280af22 762 sv_setsv(sv, PL_bodytarget);
748a9306 763 break;
e5218da5 764 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 765 if (nextchar == '\0') {
e5218da5
GA
766 sv_setiv(sv, (IV)PL_minus_c);
767 }
823a54a3 768 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
769 sv_setiv(sv, (IV)STATUS_NATIVE);
770 }
49460fe6
NIS
771 break;
772
79072805 773 case '\004': /* ^D */
aea4f609 774 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 775 break;
28f23441 776 case '\005': /* ^E */
823a54a3 777 if (nextchar == '\0') {
e37778c2 778#if defined(VMS)
0a378802
JH
779 {
780# include <descrip.h>
781# include <starlet.h>
782 char msg[255];
783 $DESCRIPTOR(msgdsc,msg);
784 sv_setnv(sv,(NV) vaxc$errno);
785 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
786 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
787 else
76f68e9b 788 sv_setpvs(sv,"");
0a378802 789 }
4b645107 790#elif defined(OS2)
0a378802
JH
791 if (!(_emx_env & 0x200)) { /* Under DOS */
792 sv_setnv(sv, (NV)errno);
793 sv_setpv(sv, errno ? Strerror(errno) : "");
794 } else {
795 if (errno != errno_isOS2) {
823a54a3 796 const int tmp = _syserrno();
0a378802
JH
797 if (tmp) /* 2nd call to _syserrno() makes it 0 */
798 Perl_rc = tmp;
799 }
800 sv_setnv(sv, (NV)Perl_rc);
801 sv_setpv(sv, os2error(Perl_rc));
802 }
4b645107 803#elif defined(WIN32)
0a378802 804 {
d4c19fe8 805 const DWORD dwErr = GetLastError();
0a378802 806 sv_setnv(sv, (NV)dwErr);
823a54a3 807 if (dwErr) {
0a378802
JH
808 PerlProc_GetOSError(sv, dwErr);
809 }
810 else
76f68e9b 811 sv_setpvs(sv, "");
0a378802
JH
812 SetLastError(dwErr);
813 }
22fae026 814#else
f6c8f21d 815 {
4ee39169 816 dSAVE_ERRNO;
f6c8f21d 817 sv_setnv(sv, (NV)errno);
666ea192 818 sv_setpv(sv, errno ? Strerror(errno) : "");
4ee39169 819 RESTORE_ERRNO;
f6c8f21d 820 }
28f23441 821#endif
ad3296c6 822 SvRTRIM(sv);
0a378802
JH
823 SvNOK_on(sv); /* what a wonderful hack! */
824 }
823a54a3 825 else if (strEQ(remaining, "NCODING"))
0a378802
JH
826 sv_setsv(sv, PL_encoding);
827 break;
79072805 828 case '\006': /* ^F */
3280af22 829 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 830 break;
a0d0e21e 831 case '\010': /* ^H */
3280af22 832 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 833 break;
9d116dd7 834 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 835 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 836 break;
ac27b0f5 837 case '\017': /* ^O & ^OPEN */
823a54a3 838 if (nextchar == '\0') {
ac27b0f5 839 sv_setpv(sv, PL_osname);
3511154c
DM
840 SvTAINTED_off(sv);
841 }
823a54a3 842 else if (strEQ(remaining, "PEN")) {
8b850bd5 843 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 844 }
28f23441 845 break;
cde0cee5
YO
846 case '\020':
847 if (nextchar == '\0') { /* ^P */
848 sv_setiv(sv, (IV)PL_perldb);
849 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
850 goto do_prematch_fetch;
851 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
852 goto do_postmatch_fetch;
853 }
79072805 854 break;
fb73857a 855 case '\023': /* ^S */
823a54a3 856 if (nextchar == '\0') {
bc177e6b 857 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 858 SvOK_off(sv);
3280af22 859 else if (PL_in_eval)
6dc8a9e4 860 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
861 else
862 sv_setiv(sv, 0);
d58bf5aa 863 }
fb73857a 864 break;
79072805 865 case '\024': /* ^T */
823a54a3 866 if (nextchar == '\0') {
88e89b8a 867#ifdef BIG_TIME
7c36658b 868 sv_setnv(sv, PL_basetime);
88e89b8a 869#else
7c36658b 870 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 871#endif
7c36658b 872 }
823a54a3 873 else if (strEQ(remaining, "AINT"))
9aa05f58
RGS
874 sv_setiv(sv, PL_tainting
875 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
876 : 0);
7c36658b 877 break;
e07ea26a 878 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 879 if (strEQ(remaining, "NICODE"))
a05d7ebb 880 sv_setuv(sv, (UV) PL_unicode);
823a54a3 881 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 882 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
883 else if (strEQ(remaining, "TF8CACHE"))
884 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
885 break;
886 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 887 if (nextchar == '\0')
4438c4b7 888 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 889 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 890 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 891 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
892 }
893 else if (PL_compiling.cop_warnings == pWARN_STD) {
666ea192
JH
894 sv_setpvn(
895 sv,
896 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
897 WARNsize
898 );
013b78e8 899 }
d3a7d8c7 900 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
901 /* Get the bit mask for $warnings::Bits{all}, because
902 * it could have been extended by warnings::register */
6673a63c 903 HV * const bits=get_hv("warnings::Bits", 0);
f5a63d97
AL
904 if (bits) {
905 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
906 if (bits_all)
907 sv_setsv(sv, *bits_all);
75b6c4ca
RGS
908 }
909 else {
910 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
911 }
ac27b0f5 912 }
4438c4b7 913 else {
72dc9ed5
NC
914 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
915 *PL_compiling.cop_warnings);
ac27b0f5 916 }
d3a7d8c7 917 SvPOK_only(sv);
4438c4b7 918 }
79072805 919 break;
cde0cee5
YO
920 case '\015': /* $^MATCH */
921 if (strEQ(remaining, "ATCH")) {
79072805
LW
922 case '1': case '2': case '3': case '4':
923 case '5': case '6': case '7': case '8': case '9': case '&':
cde0cee5
YO
924 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
925 /*
159b6efe 926 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
cde0cee5
YO
927 * XXX Does the new way break anything?
928 */
929 paren = atoi(mg->mg_ptr); /* $& is in [0] */
2fdbfb4d 930 CALLREG_NUMBUF_FETCH(rx,paren,sv);
cde0cee5
YO
931 break;
932 }
933 sv_setsv(sv,&PL_sv_undef);
79072805
LW
934 }
935 break;
936 case '+':
aaa362c4 937 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f
NC
938 if (RX_LASTPAREN(rx)) {
939 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
44a2ac75
YO
940 break;
941 }
79072805 942 }
3280af22 943 sv_setsv(sv,&PL_sv_undef);
79072805 944 break;
a01268b5
JH
945 case '\016': /* ^N */
946 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f
NC
947 if (RX_LASTCLOSEPAREN(rx)) {
948 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
44a2ac75
YO
949 break;
950 }
951
a01268b5
JH
952 }
953 sv_setsv(sv,&PL_sv_undef);
954 break;
79072805 955 case '`':
cde0cee5 956 do_prematch_fetch:
aaa362c4 957 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d 958 CALLREG_NUMBUF_FETCH(rx,-2,sv);
93b32b6d 959 break;
79072805 960 }
3280af22 961 sv_setsv(sv,&PL_sv_undef);
79072805
LW
962 break;
963 case '\'':
cde0cee5 964 do_postmatch_fetch:
aaa362c4 965 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d 966 CALLREG_NUMBUF_FETCH(rx,-1,sv);
93b32b6d 967 break;
79072805 968 }
3280af22 969 sv_setsv(sv,&PL_sv_undef);
79072805
LW
970 break;
971 case '.':
3280af22 972 if (GvIO(PL_last_in_gv)) {
357c8808 973 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 974 }
79072805
LW
975 break;
976 case '?':
809a5acc 977 {
809a5acc 978 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 979#ifdef COMPLEX_STATUS
41cb7b2b 980 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
981 LvTARGOFF(sv) = PL_statusvalue;
982 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 983#endif
809a5acc 984 }
79072805
LW
985 break;
986 case '^':
0daa599b
RGS
987 if (GvIOp(PL_defoutgv))
988 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
989 if (s)
990 sv_setpv(sv,s);
991 else {
3280af22 992 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 993 sv_catpvs(sv,"_TOP");
79072805
LW
994 }
995 break;
996 case '~':
0daa599b
RGS
997 if (GvIOp(PL_defoutgv))
998 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 999 if (!s)
3280af22 1000 s = GvENAME(PL_defoutgv);
79072805
LW
1001 sv_setpv(sv,s);
1002 break;
79072805 1003 case '=':
0daa599b
RGS
1004 if (GvIOp(PL_defoutgv))
1005 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1006 break;
1007 case '-':
0daa599b
RGS
1008 if (GvIOp(PL_defoutgv))
1009 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1010 break;
1011 case '%':
0daa599b
RGS
1012 if (GvIOp(PL_defoutgv))
1013 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1014 break;
79072805
LW
1015 case ':':
1016 break;
1017 case '/':
1018 break;
1019 case '[':
11206fdd 1020 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
79072805
LW
1021 break;
1022 case '|':
0daa599b
RGS
1023 if (GvIOp(PL_defoutgv))
1024 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1025 break;
79072805 1026 case '\\':
b2ce0fda 1027 if (PL_ors_sv)
f28098ff 1028 sv_copypv(sv, PL_ors_sv);
79072805 1029 break;
79072805 1030 case '!':
a5f75d66 1031#ifdef VMS
65202027 1032 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
88e89b8a 1033 sv_setpv(sv, errno ? Strerror(errno) : "");
a5f75d66 1034#else
88e89b8a 1035 {
4ee39169 1036 dSAVE_ERRNO;
65202027 1037 sv_setnv(sv, (NV)errno);
88e89b8a 1038#ifdef OS2
ed344e4f
IZ
1039 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1040 sv_setpv(sv, os2error(Perl_rc));
88e89b8a 1041 else
a5f75d66 1042#endif
666ea192 1043 sv_setpv(sv, errno ? Strerror(errno) : "");
4ee39169 1044 RESTORE_ERRNO;
88e89b8a
PP
1045 }
1046#endif
ad3296c6 1047 SvRTRIM(sv);
946ec16e 1048 SvNOK_on(sv); /* what a wonderful hack! */
79072805
LW
1049 break;
1050 case '<':
3280af22 1051 sv_setiv(sv, (IV)PL_uid);
79072805
LW
1052 break;
1053 case '>':
3280af22 1054 sv_setiv(sv, (IV)PL_euid);
79072805
LW
1055 break;
1056 case '(':
3280af22 1057 sv_setiv(sv, (IV)PL_gid);
79072805
LW
1058 goto add_groups;
1059 case ')':
3280af22 1060 sv_setiv(sv, (IV)PL_egid);
79072805 1061 add_groups:
79072805 1062#ifdef HAS_GETGROUPS
79072805 1063 {
57d7c65e 1064 Groups_t *gary = NULL;
fb45abb2 1065 I32 i, num_groups = getgroups(0, gary);
57d7c65e
JC
1066 Newx(gary, num_groups, Groups_t);
1067 num_groups = getgroups(num_groups, gary);
fb45abb2
GA
1068 for (i = 0; i < num_groups; i++)
1069 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
57d7c65e 1070 Safefree(gary);
79072805 1071 }
155aba94 1072 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1073#endif
79072805 1074 break;
79072805
LW
1075 case '0':
1076 break;
1077 }
a0d0e21e 1078 return 0;
79072805
LW
1079}
1080
1081int
864dbfa3 1082Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1083{
8772537c 1084 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1085
7918f24d
NC
1086 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1087
79072805 1088 if (uf && uf->uf_val)
24f81a43 1089 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1090 return 0;
1091}
1092
1093int
864dbfa3 1094Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1095{
27da23d5 1096 dVAR;
9ae3433d 1097 STRLEN len = 0, klen;
666ea192 1098 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
fabdb6c0 1099 const char * const ptr = MgPV_const(mg,klen);
88e89b8a 1100 my_setenv(ptr, s);
1e422769 1101
7918f24d
NC
1102 PERL_ARGS_ASSERT_MAGIC_SETENV;
1103
a0d0e21e
LW
1104#ifdef DYNAMIC_ENV_FETCH
1105 /* We just undefd an environment var. Is a replacement */
1106 /* waiting in the wings? */
1107 if (!len) {
fabdb6c0
AL
1108 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1109 if (valp)
4ab59fcc 1110 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1111 }
1112#endif
1e422769 1113
39e571d4 1114#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1115 /* And you'll never guess what the dog had */
1116 /* in its mouth... */
3280af22 1117 if (PL_tainting) {
1e422769
PP
1118 MgTAINTEDDIR_off(mg);
1119#ifdef VMS
5aabfad6 1120 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
b8ffc8df 1121 char pathbuf[256], eltbuf[256], *cp, *elt;
c623ac67 1122 Stat_t sbuf;
1e422769
PP
1123 int i = 0, j = 0;
1124
6fca0082 1125 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1126 elt = eltbuf;
1e422769
PP
1127 do { /* DCL$PATH may be a search list */
1128 while (1) { /* as may dev portion of any element */
1129 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1130 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1131 cando_by_name(S_IWUSR,0,elt) ) {
1132 MgTAINTEDDIR_on(mg);
1133 return 0;
1134 }
1135 }
bd61b366 1136 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1137 *cp = '\0';
1138 if (my_trnlnm(elt, eltbuf, j++))
1139 elt = eltbuf;
1140 else
1141 break;
1142 }
1143 j = 0;
1144 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1145 }
1146#endif /* VMS */
5aabfad6 1147 if (s && klen == 4 && strEQ(ptr,"PATH")) {
8772537c 1148 const char * const strend = s + len;
463ee0b2
LW
1149
1150 while (s < strend) {
96827780 1151 char tmpbuf[256];
c623ac67 1152 Stat_t st;
5f74f29c 1153 I32 i;
f5a63d97
AL
1154#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1155 const char path_sep = '|';
1156#else
1157 const char path_sep = ':';
1158#endif
96827780 1159 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1160 s, strend, path_sep, &i);
463ee0b2 1161 s++;
bb7a0f54 1162 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB
1163#ifdef VMS
1164 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1165#else
1166 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1167#endif
c6ed36e1 1168 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1169 MgTAINTEDDIR_on(mg);
1e422769
PP
1170 return 0;
1171 }
463ee0b2 1172 }
79072805
LW
1173 }
1174 }
39e571d4 1175#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1176
79072805
LW
1177 return 0;
1178}
1179
1180int
864dbfa3 1181Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1182{
7918f24d 1183 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1184 PERL_UNUSED_ARG(sv);
bd61b366 1185 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1186 return 0;
1187}
1188
88e89b8a 1189int
864dbfa3 1190Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1191{
97aff369 1192 dVAR;
7918f24d 1193 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1194 PERL_UNUSED_ARG(mg);
b0269e46 1195#if defined(VMS)
cea2e8a9 1196 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1197#else
3280af22 1198 if (PL_localizing) {
fb73857a 1199 HE* entry;
b0269e46 1200 my_clearenv();
85fbaab2
NC
1201 hv_iterinit(MUTABLE_HV(sv));
1202 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1203 I32 keylen;
1204 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1205 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1206 }
1207 }
1208#endif
1209 return 0;
1210}
1211
1212int
864dbfa3 1213Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1214{
27da23d5 1215 dVAR;
7918f24d 1216 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1217 PERL_UNUSED_ARG(sv);
1218 PERL_UNUSED_ARG(mg);
b0269e46
AB
1219#if defined(VMS)
1220 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1221#else
1222 my_clearenv();
1223#endif
3e3baf6d 1224 return 0;
66b1d557
HM
1225}
1226
64ca3a65 1227#ifndef PERL_MICRO
2d4fcd5e
AJ
1228#ifdef HAS_SIGPROCMASK
1229static void
1230restore_sigmask(pTHX_ SV *save_sv)
1231{
0bd48802 1232 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1233 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1234}
1235#endif
66b1d557 1236int
864dbfa3 1237Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1238{
97aff369 1239 dVAR;
88e89b8a 1240 /* Are we fetching a signal entry? */
708854f2 1241 int i = (I16)mg->mg_private;
7918f24d
NC
1242
1243 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1244
708854f2
NC
1245 if (!i) {
1246 mg->mg_private = i = whichsig(MgPV_nolen_const(mg));
1247 }
1248
e02bfb16 1249 if (i > 0) {
22c35a8c
GS
1250 if(PL_psig_ptr[i])
1251 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1252 else {
46da273f 1253 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1254#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1255 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1256 sigstate = SIG_IGN;
2e34cc90
CL
1257#endif
1258#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1259 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1260 sigstate = SIG_DFL;
85b332e2 1261#endif
88e89b8a 1262 /* cache state so we don't fetch it again */
8aad04aa 1263 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1264 sv_setpvs(sv,"IGNORE");
88e89b8a 1265 else
3280af22 1266 sv_setsv(sv,&PL_sv_undef);
46da273f 1267 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1268 SvTEMP_off(sv);
1269 }
1270 }
1271 return 0;
1272}
1273int
864dbfa3 1274Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1275{
7918f24d 1276 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
8772537c 1277 PERL_UNUSED_ARG(sv);
179c85a2 1278
38a124f0 1279 magic_setsig(NULL, mg);
179c85a2 1280 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1281}
3d37d572 1282
0a8e0eff 1283Signal_t
8aad04aa 1284#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1285Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1286#else
0a8e0eff 1287Perl_csighandler(int sig)
8aad04aa 1288#endif
0a8e0eff 1289{
1018e26f
NIS
1290#ifdef PERL_GET_SIG_CONTEXT
1291 dTHXa(PERL_GET_SIG_CONTEXT);
1292#else
85b332e2
CL
1293 dTHX;
1294#endif
23ada85b 1295#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1296 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1297 if (PL_sig_ignoring[sig]) return;
85b332e2 1298#endif
2e34cc90 1299#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1300 if (PL_sig_defaulting[sig])
2e34cc90
CL
1301#ifdef KILL_BY_SIGPRC
1302 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1303#else
1304 exit(1);
1305#endif
1306#endif
406878dd 1307 if (
853d2c32
RGS
1308#ifdef SIGILL
1309 sig == SIGILL ||
1310#endif
1311#ifdef SIGBUS
1312 sig == SIGBUS ||
1313#endif
1314#ifdef SIGSEGV
1315 sig == SIGSEGV ||
1316#endif
1317 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3 1318 /* Call the perl level handler now--
31c91b43 1319 * with risk we may be in malloc() or being destructed etc. */
6e324d09 1320#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1321 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1322#else
1323 (*PL_sighandlerp)(sig);
92807b6d 1324#endif
406878dd 1325 else {
31c91b43 1326 if (!PL_psig_pend) return;
406878dd
GA
1327 /* Set a flag to say this signal is pending, that is awaiting delivery after
1328 * the current Perl opcode completes */
1329 PL_psig_pend[sig]++;
1330
1331#ifndef SIG_PENDING_DIE_COUNT
1332# define SIG_PENDING_DIE_COUNT 120
1333#endif
fe13d51d 1334 /* Add one to say _a_ signal is pending */
406878dd
GA
1335 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1336 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1337 (unsigned long)SIG_PENDING_DIE_COUNT);
1338 }
0a8e0eff
NIS
1339}
1340
2e34cc90
CL
1341#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1342void
1343Perl_csighandler_init(void)
1344{
1345 int sig;
27da23d5 1346 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1347
1348 for (sig = 1; sig < SIG_SIZE; sig++) {
1349#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1350 dTHX;
27da23d5 1351 PL_sig_defaulting[sig] = 1;
5c1546dc 1352 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1353#endif
1354#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1355 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1356#endif
1357 }
27da23d5 1358 PL_sig_handlers_initted = 1;
2e34cc90
CL
1359}
1360#endif
1361
0a8e0eff
NIS
1362void
1363Perl_despatch_signals(pTHX)
1364{
97aff369 1365 dVAR;
0a8e0eff
NIS
1366 int sig;
1367 PL_sig_pending = 0;
1368 for (sig = 1; sig < SIG_SIZE; sig++) {
1369 if (PL_psig_pend[sig]) {
25da4428
JH
1370 PERL_BLOCKSIG_ADD(set, sig);
1371 PL_psig_pend[sig] = 0;
1372 PERL_BLOCKSIG_BLOCK(set);
6e324d09 1373#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1374 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1375#else
1376 (*PL_sighandlerp)(sig);
92807b6d 1377#endif
25da4428 1378 PERL_BLOCKSIG_UNBLOCK(set);
0a8e0eff
NIS
1379 }
1380 }
1381}
1382
38a124f0 1383/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1384int
864dbfa3 1385Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1386{
27da23d5 1387 dVAR;
79072805 1388 I32 i;
cbbf8932 1389 SV** svp = NULL;
2d4fcd5e
AJ
1390 /* Need to be careful with SvREFCNT_dec(), because that can have side
1391 * effects (due to closures). We must make sure that the new disposition
1392 * is in place before it is called.
1393 */
cbbf8932 1394 SV* to_dec = NULL;
e72dc28c 1395 STRLEN len;
2d4fcd5e
AJ
1396#ifdef HAS_SIGPROCMASK
1397 sigset_t set, save;
1398 SV* save_sv;
1399#endif
d5263905 1400 register const char *s = MgPV_const(mg,len);
7918f24d
NC
1401
1402 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1403
748a9306
LW
1404 if (*s == '_') {
1405 if (strEQ(s,"__DIE__"))
3280af22 1406 svp = &PL_diehook;
38a124f0
NC
1407 else if (strEQ(s,"__WARN__")
1408 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1409 /* Merge the existing behaviours, which are as follows:
1410 magic_setsig, we always set svp to &PL_warnhook
1411 (hence we always change the warnings handler)
1412 For magic_clearsig, we don't change the warnings handler if it's
1413 set to the &PL_warnhook. */
3280af22 1414 svp = &PL_warnhook;
38a124f0 1415 } else if (sv)
cea2e8a9 1416 Perl_croak(aTHX_ "No such hook: %s", s);
748a9306 1417 i = 0;
38a124f0 1418 if (svp && *svp) {
9289f461
RGS
1419 if (*svp != PERL_WARNHOOK_FATAL)
1420 to_dec = *svp;
cbbf8932 1421 *svp = NULL;
4633a7c4 1422 }
748a9306
LW
1423 }
1424 else {
708854f2
NC
1425 i = (I16)mg->mg_private;
1426 if (!i) {
58a26b12
NC
1427 i = whichsig(s); /* ...no, a brick */
1428 mg->mg_private = (U16)i;
708854f2 1429 }
86d86cad 1430 if (i <= 0) {
a2a5de95
NC
1431 if (sv)
1432 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
748a9306
LW
1433 return 0;
1434 }
2d4fcd5e
AJ
1435#ifdef HAS_SIGPROCMASK
1436 /* Avoid having the signal arrive at a bad time, if possible. */
1437 sigemptyset(&set);
1438 sigaddset(&set,i);
1439 sigprocmask(SIG_BLOCK, &set, &save);
1440 ENTER;
9ff8e806 1441 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1442 SAVEFREESV(save_sv);
1443 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1444#endif
1445 PERL_ASYNC_CHECK();
2e34cc90 1446#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1447 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1448#endif
23ada85b 1449#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1450 PL_sig_ignoring[i] = 0;
85b332e2 1451#endif
2e34cc90 1452#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1453 PL_sig_defaulting[i] = 0;
2e34cc90 1454#endif
2d4fcd5e 1455 to_dec = PL_psig_ptr[i];
38a124f0
NC
1456 if (sv) {
1457 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1458 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1459
1460 /* Signals don't change name during the program's execution, so once
1461 they're cached in the appropriate slot of PL_psig_name, they can
1462 stay there.
1463
1464 Ideally we'd find some way of making SVs at (C) compile time, or
1465 at least, doing most of the work. */
1466 if (!PL_psig_name[i]) {
1467 PL_psig_name[i] = newSVpvn(s, len);
1468 SvREADONLY_on(PL_psig_name[i]);
1469 }
38a124f0 1470 } else {
79fd3822 1471 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1472 PL_psig_name[i] = NULL;
1473 PL_psig_ptr[i] = NULL;
1474 }
748a9306 1475 }
38a124f0 1476 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1477 if (i) {
5c1546dc 1478 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1479 }
748a9306 1480 else
b37c2d43 1481 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1482 } else {
9dfa190b
NC
1483 if (sv && SvOK(sv)) {
1484 s = SvPV_force(sv, len);
1485 } else {
1486 sv = NULL;
1487 }
1488 if (sv && strEQ(s,"IGNORE")) {
1489 if (i) {
23ada85b 1490#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1491 PL_sig_ignoring[i] = 1;
1492 (void)rsignal(i, PL_csighandlerp);
85b332e2 1493#else
9dfa190b 1494 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1495#endif
9dfa190b 1496 }
2d4fcd5e 1497 }
9dfa190b
NC
1498 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1499 if (i) {
2e34cc90 1500#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1501 PL_sig_defaulting[i] = 1;
1502 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1503#else
9dfa190b 1504 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1505#endif
9dfa190b
NC
1506 }
1507 }
1508 else {
1509 /*
1510 * We should warn if HINT_STRICT_REFS, but without
1511 * access to a known hint bit in a known OP, we can't
1512 * tell whether HINT_STRICT_REFS is in force or not.
1513 */
1514 if (!strchr(s,':') && !strchr(s,'\''))
1515 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1516 SV_GMAGIC);
1517 if (i)
1518 (void)rsignal(i, PL_csighandlerp);
1519 else
1520 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1521 }
748a9306 1522 }
9dfa190b 1523
2d4fcd5e
AJ
1524#ifdef HAS_SIGPROCMASK
1525 if(i)
1526 LEAVE;
1527#endif
1528 if(to_dec)
1529 SvREFCNT_dec(to_dec);
79072805
LW
1530 return 0;
1531}
64ca3a65 1532#endif /* !PERL_MICRO */
79072805
LW
1533
1534int
864dbfa3 1535Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1536{
97aff369 1537 dVAR;
7918f24d 1538 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1539 PERL_UNUSED_ARG(sv);
e1a479c5 1540
89c14e2e
BB
1541 /* Skip _isaelem because _isa will handle it shortly */
1542 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1543 return 0;
1544
0e446081 1545 return magic_clearisa(NULL, mg);
463ee0b2
LW
1546}
1547
0e446081 1548/* sv of NULL signifies that we're acting as magic_setisa. */
463ee0b2 1549int
52b45067
RD
1550Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1551{
1552 dVAR;
1553 HV* stash;
1554
7918f24d
NC
1555 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1556
52b45067
RD
1557 /* Bail out if destruction is going on */
1558 if(PL_dirty) return 0;
1559
0e446081
NC
1560 if (sv)
1561 av_clear(MUTABLE_AV(sv));
52b45067 1562
0e446081
NC
1563 /* XXX Once it's possible, we need to
1564 detect that our @ISA is aliased in
1565 other stashes, and act on the stashes
1566 of all of the aliases */
1567
1568 /* The first case occurs via setisa,
1569 the second via setisa_elem, which
1570 calls this same magic */
52b45067
RD
1571 stash = GvSTASH(
1572 SvTYPE(mg->mg_obj) == SVt_PVGV
159b6efe
NC
1573 ? (const GV *)mg->mg_obj
1574 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
52b45067
RD
1575 );
1576
5562fa71
RGS
1577 if (stash)
1578 mro_isa_changed_in(stash);
52b45067
RD
1579
1580 return 0;
1581}
1582
1583int
864dbfa3 1584Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1585{
97aff369 1586 dVAR;
7918f24d 1587 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
8772537c
AL
1588 PERL_UNUSED_ARG(sv);
1589 PERL_UNUSED_ARG(mg);
3280af22 1590 PL_amagic_generation++;
463ee0b2 1591
a0d0e21e
LW
1592 return 0;
1593}
463ee0b2 1594
946ec16e 1595int
864dbfa3 1596Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1597{
85fbaab2 1598 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1599 I32 i = 0;
7918f24d
NC
1600
1601 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1602 PERL_UNUSED_ARG(mg);
7719e241 1603
6ff81951 1604 if (hv) {
497b47a8 1605 (void) hv_iterinit(hv);
ad64d0ec 1606 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
497b47a8
JH
1607 i = HvKEYS(hv);
1608 else {
1609 while (hv_iternext(hv))
1610 i++;
1611 }
6ff81951
GS
1612 }
1613
1614 sv_setiv(sv, (IV)i);
1615 return 0;
1616}
1617
1618int
864dbfa3 1619Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1620{
7918f24d 1621 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1622 PERL_UNUSED_ARG(mg);
946ec16e 1623 if (LvTARG(sv)) {
85fbaab2 1624 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1625 }
1626 return 0;
ac27b0f5 1627}
946ec16e 1628
e336de0d 1629/* caller is responsible for stack switching/cleanup */
565764a8 1630STATIC int
e1ec3a88 1631S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
a0d0e21e 1632{
97aff369 1633 dVAR;
a0d0e21e 1634 dSP;
463ee0b2 1635
7918f24d
NC
1636 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1637
924508f0
GS
1638 PUSHMARK(SP);
1639 EXTEND(SP, n);
33c27489 1640 PUSHs(SvTIED_obj(sv, mg));
ac27b0f5 1641 if (n > 1) {
93965878 1642 if (mg->mg_ptr) {
565764a8 1643 if (mg->mg_len >= 0)
6e449a3a 1644 mPUSHp(mg->mg_ptr, mg->mg_len);
565764a8 1645 else if (mg->mg_len == HEf_SVKEY)
ad64d0ec 1646 PUSHs(MUTABLE_SV(mg->mg_ptr));
93965878 1647 }
14befaf4 1648 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
6e449a3a 1649 mPUSHi(mg->mg_len);
93965878
NIS
1650 }
1651 }
1652 if (n > 2) {
1653 PUSHs(val);
88e89b8a 1654 }
463ee0b2
LW
1655 PUTBACK;
1656
864dbfa3 1657 return call_method(meth, flags);
946ec16e
PP
1658}
1659
76e3520e 1660STATIC int
e1ec3a88 1661S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
a0d0e21e 1662{
27da23d5 1663 dVAR; dSP;
463ee0b2 1664
7918f24d
NC
1665 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1666
a0d0e21e
LW
1667 ENTER;
1668 SAVETMPS;
e788e7d3 1669 PUSHSTACKi(PERLSI_MAGIC);
463ee0b2 1670
33c27489 1671 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
3280af22 1672 sv_setsv(sv, *PL_stack_sp--);
93965878 1673 }
463ee0b2 1674
d3acc0f7 1675 POPSTACK;
a0d0e21e
LW
1676 FREETMPS;
1677 LEAVE;
1678 return 0;
1679}
463ee0b2 1680
a0d0e21e 1681int
864dbfa3 1682Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1683{
7918f24d
NC
1684 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1685
a0d0e21e
LW
1686 if (mg->mg_ptr)
1687 mg->mg_flags |= MGf_GSKIP;
58f82c5c 1688 magic_methpack(sv,mg,"FETCH");
463ee0b2
LW
1689 return 0;
1690}
1691
1692int
864dbfa3 1693Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1694{
27da23d5 1695 dVAR; dSP;
7918f24d
NC
1696
1697 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1698
a60c0954 1699 ENTER;
e788e7d3 1700 PUSHSTACKi(PERLSI_MAGIC);
33c27489 1701 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
d3acc0f7 1702 POPSTACK;
a60c0954 1703 LEAVE;
463ee0b2
LW
1704 return 0;
1705}
1706
1707int
864dbfa3 1708Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1709{
7918f24d
NC
1710 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1711
a0d0e21e
LW
1712 return magic_methpack(sv,mg,"DELETE");
1713}
463ee0b2 1714
93965878
NIS
1715
1716U32
864dbfa3 1717Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1718{
27da23d5 1719 dVAR; dSP;
22846ab4 1720 I32 retval = 0;
93965878 1721
7918f24d
NC
1722 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1723
93965878
NIS
1724 ENTER;
1725 SAVETMPS;
e788e7d3 1726 PUSHSTACKi(PERLSI_MAGIC);
33c27489 1727 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
3280af22 1728 sv = *PL_stack_sp--;
22846ab4
AB
1729 retval = SvIV(sv)-1;
1730 if (retval < -1)
1731 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1732 }
d3acc0f7 1733 POPSTACK;
93965878
NIS
1734 FREETMPS;
1735 LEAVE;
22846ab4 1736 return (U32) retval;
93965878
NIS
1737}
1738
cea2e8a9
GS
1739int
1740Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1741{
27da23d5 1742 dVAR; dSP;
463ee0b2 1743
7918f24d
NC
1744 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1745
e336de0d 1746 ENTER;
e788e7d3 1747 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1748 PUSHMARK(SP);
33c27489 1749 XPUSHs(SvTIED_obj(sv, mg));
463ee0b2 1750 PUTBACK;
864dbfa3 1751 call_method("CLEAR", G_SCALAR|G_DISCARD);
d3acc0f7 1752 POPSTACK;
a60c0954 1753 LEAVE;
a3bcc51e 1754
463ee0b2
LW
1755 return 0;
1756}
1757
1758int
864dbfa3 1759Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1760{
27da23d5 1761 dVAR; dSP;
666ea192 1762 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
463ee0b2 1763
7918f24d
NC
1764 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1765
463ee0b2 1766 ENTER;
a0d0e21e 1767 SAVETMPS;
e788e7d3 1768 PUSHSTACKi(PERLSI_MAGIC);
924508f0
GS
1769 PUSHMARK(SP);
1770 EXTEND(SP, 2);
33c27489 1771 PUSHs(SvTIED_obj(sv, mg));
463ee0b2
LW
1772 if (SvOK(key))
1773 PUSHs(key);
1774 PUTBACK;
1775
864dbfa3 1776 if (call_method(meth, G_SCALAR))
3280af22 1777 sv_setsv(key, *PL_stack_sp--);
463ee0b2 1778
d3acc0f7 1779 POPSTACK;
a0d0e21e
LW
1780 FREETMPS;
1781 LEAVE;
79072805
LW
1782 return 0;
1783}
1784
1785int
1146e912 1786Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1787{
7918f24d
NC
1788 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1789
a0d0e21e 1790 return magic_methpack(sv,mg,"EXISTS");
ac27b0f5 1791}
a0d0e21e 1792
a3bcc51e
TP
1793SV *
1794Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1795{
27da23d5 1796 dVAR; dSP;
5fcbf73d 1797 SV *retval;
ad64d0ec
NC
1798 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1799 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1800
7918f24d
NC
1801 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1802
a3bcc51e
TP
1803 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1804 SV *key;
bfcb3514 1805 if (HvEITER_get(hv))
a3bcc51e
TP
1806 /* we are in an iteration so the hash cannot be empty */
1807 return &PL_sv_yes;
1808 /* no xhv_eiter so now use FIRSTKEY */
1809 key = sv_newmortal();
ad64d0ec 1810 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1811 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
1812 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1813 }
1814
1815 /* there is a SCALAR method that we can call */
1816 ENTER;
1817 PUSHSTACKi(PERLSI_MAGIC);
1818 PUSHMARK(SP);
1819 EXTEND(SP, 1);
1820 PUSHs(tied);
1821 PUTBACK;
1822
1823 if (call_method("SCALAR", G_SCALAR))
1824 retval = *PL_stack_sp--;
5fcbf73d
AL
1825 else
1826 retval = &PL_sv_undef;
a3bcc51e
TP
1827 POPSTACK;
1828 LEAVE;
1829 return retval;
1830}
1831
a0d0e21e 1832int
864dbfa3 1833Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1834{
97aff369 1835 dVAR;
8772537c
AL
1836 GV * const gv = PL_DBline;
1837 const I32 i = SvTRUE(sv);
1838 SV ** const svp = av_fetch(GvAV(gv),
01b8bcb7 1839 atoi(MgPV_nolen_const(mg)), FALSE);
7918f24d
NC
1840
1841 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1842
8772537c
AL
1843 if (svp && SvIOKp(*svp)) {
1844 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1845 if (o) {
1846 /* set or clear breakpoint in the relevant control op */
1847 if (i)
1848 o->op_flags |= OPf_SPECIAL;
1849 else
1850 o->op_flags &= ~OPf_SPECIAL;
1851 }
5df8de69 1852 }
79072805
LW
1853 return 0;
1854}
1855
1856int
8772537c 1857Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 1858{
97aff369 1859 dVAR;
502c6561 1860 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
1861
1862 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1863
83bf042f 1864 if (obj) {
fc15ae8f 1865 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
83bf042f
NC
1866 } else {
1867 SvOK_off(sv);
1868 }
79072805
LW
1869 return 0;
1870}
1871
1872int
864dbfa3 1873Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 1874{
97aff369 1875 dVAR;
502c6561 1876 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
1877
1878 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1879
83bf042f 1880 if (obj) {
fc15ae8f 1881 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
83bf042f 1882 } else {
a2a5de95
NC
1883 Perl_ck_warner(aTHX_ packWARN(WARN_MISC),
1884 "Attempt to set length of freed array");
83bf042f
NC
1885 }
1886 return 0;
1887}
1888
1889int
1890Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1891{
97aff369 1892 dVAR;
7918f24d
NC
1893
1894 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 1895 PERL_UNUSED_ARG(sv);
7918f24d 1896
94f3782b
DM
1897 /* during global destruction, mg_obj may already have been freed */
1898 if (PL_in_clean_all)
1ea47f64 1899 return 0;
94f3782b 1900
83bf042f
NC
1901 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1902
1903 if (mg) {
1904 /* arylen scalar holds a pointer back to the array, but doesn't own a
1905 reference. Hence the we (the array) are about to go away with it
1906 still pointing at us. Clear its pointer, else it would be pointing
1907 at free memory. See the comment in sv_magic about reference loops,
1908 and why it can't own a reference to us. */
1909 mg->mg_obj = 0;
1910 }
a0d0e21e
LW
1911 return 0;
1912}
1913
1914int
864dbfa3 1915Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1916{
97aff369 1917 dVAR;
8772537c 1918 SV* const lsv = LvTARG(sv);
7918f24d
NC
1919
1920 PERL_ARGS_ASSERT_MAGIC_GETPOS;
3881461a 1921 PERL_UNUSED_ARG(mg);
ac27b0f5 1922
a0d0e21e 1923 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
3881461a
AL
1924 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1925 if (found && found->mg_len >= 0) {
1926 I32 i = found->mg_len;
7e2040f0 1927 if (DO_UTF8(lsv))
a0ed51b3 1928 sv_pos_b2u(lsv, &i);
fc15ae8f 1929 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
a0d0e21e
LW
1930 return 0;
1931 }
1932 }
0c34ef67 1933 SvOK_off(sv);
a0d0e21e
LW
1934 return 0;
1935}
1936
1937int
864dbfa3 1938Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1939{
97aff369 1940 dVAR;
8772537c 1941 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
1942 SSize_t pos;
1943 STRLEN len;
c00206c8 1944 STRLEN ulen = 0;
53d44271 1945 MAGIC* found;
a0d0e21e 1946
7918f24d 1947 PERL_ARGS_ASSERT_MAGIC_SETPOS;
3881461a 1948 PERL_UNUSED_ARG(mg);
ac27b0f5 1949
a0d0e21e 1950 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
3881461a
AL
1951 found = mg_find(lsv, PERL_MAGIC_regex_global);
1952 else
1953 found = NULL;
1954 if (!found) {
a0d0e21e
LW
1955 if (!SvOK(sv))
1956 return 0;
d83f0a82
NC
1957#ifdef PERL_OLD_COPY_ON_WRITE
1958 if (SvIsCOW(lsv))
1959 sv_force_normal_flags(lsv, 0);
1960#endif
3881461a 1961 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
53d44271 1962 NULL, 0);
a0d0e21e
LW
1963 }
1964 else if (!SvOK(sv)) {
3881461a 1965 found->mg_len = -1;
a0d0e21e
LW
1966 return 0;
1967 }
1968 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1969
fc15ae8f 1970 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
a0ed51b3 1971
7e2040f0 1972 if (DO_UTF8(lsv)) {
a0ed51b3
LW
1973 ulen = sv_len_utf8(lsv);
1974 if (ulen)
1975 len = ulen;
a0ed51b3
LW
1976 }
1977
a0d0e21e
LW
1978 if (pos < 0) {
1979 pos += len;
1980 if (pos < 0)
1981 pos = 0;
1982 }
eb160463 1983 else if (pos > (SSize_t)len)
a0d0e21e 1984 pos = len;
a0ed51b3
LW
1985
1986 if (ulen) {
1987 I32 p = pos;
1988 sv_pos_u2b(lsv, &p, 0);
1989 pos = p;
1990 }
727405f8 1991
3881461a
AL
1992 found->mg_len = pos;
1993 found->mg_flags &= ~MGf_MINMATCH;
a0d0e21e 1994
79072805
LW
1995 return 0;
1996}
1997
1998int
864dbfa3 1999Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2000{
2001 STRLEN len;
35a4481c 2002 SV * const lsv = LvTARG(sv);
b83604b4 2003 const char * const tmps = SvPV_const(lsv,len);
6ff81951
GS
2004 I32 offs = LvTARGOFF(sv);
2005 I32 rem = LvTARGLEN(sv);
7918f24d
NC
2006
2007 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2008 PERL_UNUSED_ARG(mg);
6ff81951 2009
9aa983d2
JH
2010 if (SvUTF8(lsv))
2011 sv_pos_u2b(lsv, &offs, &rem);
eb160463 2012 if (offs > (I32)len)
6ff81951 2013 offs = len;
eb160463 2014 if (rem + offs > (I32)len)
6ff81951
GS
2015 rem = len - offs;
2016 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
9aa983d2 2017 if (SvUTF8(lsv))
2ef4b674 2018 SvUTF8_on(sv);
6ff81951
GS
2019 return 0;
2020}
2021
2022int
864dbfa3 2023Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2024{
97aff369 2025 dVAR;
9aa983d2 2026 STRLEN len;
5fcbf73d 2027 const char * const tmps = SvPV_const(sv, len);
dd374669 2028 SV * const lsv = LvTARG(sv);
9aa983d2
JH
2029 I32 lvoff = LvTARGOFF(sv);
2030 I32 lvlen = LvTARGLEN(sv);
7918f24d
NC
2031
2032 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2033 PERL_UNUSED_ARG(mg);
075a4a2b 2034
1aa99e6b 2035 if (DO_UTF8(sv)) {
9aa983d2
JH
2036 sv_utf8_upgrade(lsv);
2037 sv_pos_u2b(lsv, &lvoff, &lvlen);
2038 sv_insert(lsv, lvoff, lvlen, tmps, len);
b76f3ce2 2039 LvTARGLEN(sv) = sv_len_utf8(sv);
9aa983d2
JH
2040 SvUTF8_on(lsv);
2041 }
9bf12eaf 2042 else if (lsv && SvUTF8(lsv)) {
5fcbf73d 2043 const char *utf8;
9aa983d2 2044 sv_pos_u2b(lsv, &lvoff, &lvlen);
b76f3ce2 2045 LvTARGLEN(sv) = len;
5fcbf73d
AL
2046 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2047 sv_insert(lsv, lvoff, lvlen, utf8, len);
2048 Safefree(utf8);
1aa99e6b 2049 }
b76f3ce2
GB
2050 else {
2051 sv_insert(lsv, lvoff, lvlen, tmps, len);
2052 LvTARGLEN(sv) = len;
2053 }
2054
1aa99e6b 2055
79072805
LW
2056 return 0;
2057}
2058
2059int
864dbfa3 2060Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2061{
97aff369 2062 dVAR;
7918f24d
NC
2063
2064 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2065 PERL_UNUSED_ARG(sv);
7918f24d 2066
27cc343c 2067 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW
2068 return 0;
2069}
2070
2071int
864dbfa3 2072Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2073{
97aff369 2074 dVAR;
7918f24d
NC
2075
2076 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2077 PERL_UNUSED_ARG(sv);
7918f24d 2078
b01e650a
DM
2079 /* update taint status */
2080 if (PL_tainted)
2081 mg->mg_len |= 1;
2082 else
2083 mg->mg_len &= ~1;
463ee0b2
LW
2084 return 0;
2085}
2086
2087int
864dbfa3 2088Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2089{
35a4481c 2090 SV * const lsv = LvTARG(sv);
7918f24d
NC
2091
2092 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2093 PERL_UNUSED_ARG(mg);
6ff81951 2094
6136c704
AL
2095 if (lsv)
2096 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2097 else
0c34ef67 2098 SvOK_off(sv);
6ff81951 2099
6ff81951
GS
2100 return 0;
2101}
2102
2103int
864dbfa3 2104Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2105{
7918f24d 2106 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2107 PERL_UNUSED_ARG(mg);
79072805
LW
2108 do_vecset(sv); /* XXX slurp this routine */
2109 return 0;
2110}
2111
2112int
864dbfa3 2113Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2114{
97aff369 2115 dVAR;
a0714e2c 2116 SV *targ = NULL;
7918f24d
NC
2117
2118 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2119
5f05dabc 2120 if (LvTARGLEN(sv)) {
68dc0745 2121 if (mg->mg_obj) {
8772537c 2122 SV * const ahv = LvTARG(sv);
85fbaab2 2123 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2124 if (he)
2125 targ = HeVAL(he);
68dc0745
PP
2126 }
2127 else {
502c6561 2128 AV *const av = MUTABLE_AV(LvTARG(sv));
68dc0745
PP
2129 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2130 targ = AvARRAY(av)[LvTARGOFF(sv)];
2131 }
46da273f 2132 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2133 /* somebody else defined it for us */
2134 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2135 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2136 LvTARGLEN(sv) = 0;
2137 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2138 mg->mg_obj = NULL;
68dc0745
PP
2139 mg->mg_flags &= ~MGf_REFCOUNTED;
2140 }
5f05dabc 2141 }
71be2cbc
PP
2142 else
2143 targ = LvTARG(sv);
3280af22 2144 sv_setsv(sv, targ ? targ : &PL_sv_undef);
71be2cbc
PP
2145 return 0;
2146}
2147
2148int
864dbfa3 2149Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2150{
7918f24d 2151 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2152 PERL_UNUSED_ARG(mg);
71be2cbc 2153 if (LvTARGLEN(sv))
68dc0745
PP
2154 vivify_defelem(sv);
2155 if (LvTARG(sv)) {
5f05dabc 2156 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2157 SvSETMAGIC(LvTARG(sv));
2158 }
5f05dabc
PP
2159 return 0;
2160}
2161
71be2cbc 2162void
864dbfa3 2163Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2164{
97aff369 2165 dVAR;
74e13ce4 2166 MAGIC *mg;
a0714e2c 2167 SV *value = NULL;
71be2cbc 2168
7918f24d
NC
2169 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2170
14befaf4 2171 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2172 return;
68dc0745 2173 if (mg->mg_obj) {
8772537c 2174 SV * const ahv = LvTARG(sv);
85fbaab2 2175 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2176 if (he)
2177 value = HeVAL(he);
3280af22 2178 if (!value || value == &PL_sv_undef)
be2597df 2179 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2180 }
68dc0745 2181 else {
502c6561 2182 AV *const av = MUTABLE_AV(LvTARG(sv));
5aabfad6 2183 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
a0714e2c 2184 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2185 else {
d4c19fe8 2186 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
3280af22 2187 if (!svp || (value = *svp) == &PL_sv_undef)
cea2e8a9 2188 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
68dc0745
PP
2189 }
2190 }
b37c2d43 2191 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2192 SvREFCNT_dec(LvTARG(sv));
2193 LvTARG(sv) = value;
71be2cbc 2194 LvTARGLEN(sv) = 0;
68dc0745 2195 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2196 mg->mg_obj = NULL;
68dc0745 2197 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2198}
2199
2200int
864dbfa3 2201Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2202{
7918f24d 2203 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
502c6561 2204 return Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
810b8aa5
GS
2205}
2206
2207int
864dbfa3 2208Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2209{
7918f24d 2210 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2211 PERL_UNUSED_CONTEXT;
565764a8 2212 mg->mg_len = -1;
c6496cc7 2213 SvSCREAM_off(sv);
93a17b20
LW
2214 return 0;
2215}
2216
2217int
864dbfa3 2218Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2219{
35a4481c 2220 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2221
7918f24d
NC
2222 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2223
79072805 2224 if (uf && uf->uf_set)
24f81a43 2225 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2226 return 0;
2227}
2228
c277df42 2229int
faf82a0b
AE
2230Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2231{
488344d2 2232 const char type = mg->mg_type;
7918f24d
NC
2233
2234 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2235
488344d2
NC
2236 if (type == PERL_MAGIC_qr) {
2237 } else if (type == PERL_MAGIC_bm) {
2238 SvTAIL_off(sv);
2239 SvVALID_off(sv);
2240 } else {
2241 assert(type == PERL_MAGIC_fm);
2242 SvCOMPILED_off(sv);
2243 }
2244 return sv_unmagic(sv, type);
faf82a0b
AE
2245}
2246
7a4c00b4 2247#ifdef USE_LOCALE_COLLATE
79072805 2248int
864dbfa3 2249Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2250{
7918f24d
NC
2251 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2252
bbce6d69 2253 /*
838b5b74 2254 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2255 * and vanished with a faint plop.
2256 */
96a5add6 2257 PERL_UNUSED_CONTEXT;
8772537c 2258 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2259 if (mg->mg_ptr) {
2260 Safefree(mg->mg_ptr);
2261 mg->mg_ptr = NULL;
565764a8 2262 mg->mg_len = -1;
7a4c00b4 2263 }
bbce6d69
PP
2264 return 0;
2265}
7a4c00b4 2266#endif /* USE_LOCALE_COLLATE */
bbce6d69 2267
7e8c5dac
HS
2268/* Just clear the UTF-8 cache data. */
2269int
2270Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2271{
7918f24d 2272 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2273 PERL_UNUSED_CONTEXT;
8772537c 2274 PERL_UNUSED_ARG(sv);
7e8c5dac 2275 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2276 mg->mg_ptr = NULL;
7e8c5dac
HS
2277 mg->mg_len = -1; /* The mg_len holds the len cache. */
2278 return 0;
2279}
2280
bbce6d69 2281int
864dbfa3 2282Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2283{
97aff369 2284 dVAR;
e1ec3a88 2285 register const char *s;
2fdbfb4d
AB
2286 register I32 paren;
2287 register const REGEXP * rx;
2288 const char * const remaining = mg->mg_ptr + 1;
79072805 2289 I32 i;
8990e307 2290 STRLEN len;
2fdbfb4d 2291
7918f24d
NC
2292 PERL_ARGS_ASSERT_MAGIC_SET;
2293
79072805 2294 switch (*mg->mg_ptr) {
2fdbfb4d
AB
2295 case '\015': /* $^MATCH */
2296 if (strEQ(remaining, "ATCH"))
2297 goto do_match;
2298 case '`': /* ${^PREMATCH} caught below */
2299 do_prematch:
f1b875a0 2300 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB
2301 goto setparen;
2302 case '\'': /* ${^POSTMATCH} caught below */
2303 do_postmatch:
f1b875a0 2304 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB
2305 goto setparen;
2306 case '&':
2307 do_match:
f1b875a0 2308 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d
AB
2309 goto setparen;
2310 case '1': case '2': case '3': case '4':
2311 case '5': case '6': case '7': case '8': case '9':
104a8018 2312 paren = atoi(mg->mg_ptr);
2fdbfb4d 2313 setparen:
1e05feb3 2314 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d
AB
2315 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2316 break;
1e05feb3 2317 } else {
2fdbfb4d
AB
2318 /* Croak with a READONLY error when a numbered match var is
2319 * set without a previous pattern match. Unless it's C<local $1>
2320 */
2321 if (!PL_localizing) {
f1f66076 2322 Perl_croak(aTHX_ "%s", PL_no_modify);
2fdbfb4d
AB
2323 }
2324 }
748a9306 2325 case '\001': /* ^A */
3280af22 2326 sv_setsv(PL_bodytarget, sv);
748a9306 2327 break;
49460fe6 2328 case '\003': /* ^C */
38ab35f8 2329 PL_minus_c = (bool)SvIV(sv);
49460fe6
NIS
2330 break;
2331
79072805 2332 case '\004': /* ^D */
b4ab917c 2333#ifdef DEBUGGING
b83604b4 2334 s = SvPV_nolen_const(sv);
ddcf8bc1 2335 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
a58fb6f9
CS
2336 if (DEBUG_x_TEST || DEBUG_B_TEST)
2337 dump_all_perl(!DEBUG_B_TEST);
b4ab917c 2338#else
38ab35f8 2339 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2340#endif
79072805 2341 break;
28f23441 2342 case '\005': /* ^E */
d0063567 2343 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2344#ifdef VMS
38ab35f8 2345 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2346#else
2347# ifdef WIN32
d0063567 2348 SetLastError( SvIV(sv) );
e37778c2
NC
2349# else
2350# ifdef OS2
38ab35f8 2351 os2_setsyserrno(SvIV(sv));
e37778c2 2352# else
d0063567 2353 /* will anyone ever use this? */
38ab35f8 2354 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2355# endif
2356# endif
22fae026 2357#endif
d0063567
DK
2358 }
2359 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2360 if (PL_encoding)
2361 SvREFCNT_dec(PL_encoding);
2362 if (SvOK(sv) || SvGMAGICAL(sv)) {
2363 PL_encoding = newSVsv(sv);
2364 }
2365 else {
a0714e2c 2366 PL_encoding = NULL;
d0063567
DK
2367 }
2368 }
2369 break;
79072805 2370 case '\006': /* ^F */
38ab35f8 2371 PL_maxsysfd = SvIV(sv);
79072805 2372 break;
a0d0e21e 2373 case '\010': /* ^H */
38ab35f8 2374 PL_hints = SvIV(sv);
a0d0e21e 2375 break;
9d116dd7 2376 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2377 Safefree(PL_inplace);
bd61b366 2378 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2379 break;
28f23441 2380 case '\017': /* ^O */
ac27b0f5 2381 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2382 Safefree(PL_osname);
bd61b366 2383 PL_osname = NULL;
3511154c
DM
2384 if (SvOK(sv)) {
2385 TAINT_PROPER("assigning to $^O");
2e0de35c 2386 PL_osname = savesvpv(sv);
3511154c 2387 }
ac27b0f5
NIS
2388 }
2389 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2390 STRLEN len;
2391 const char *const start = SvPV(sv, len);
b54fc2b6 2392 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5 2393 SV *tmp;
8b850bd5
NC
2394
2395
2396 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
f747ebd6 2397 PL_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
8b850bd5
NC
2398
2399 /* Opening for input is more common than opening for output, so
2400 ensure that hints for input are sooner on linked list. */
59cd0e26 2401 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
f747ebd6
Z
2402 SvUTF8(sv))
2403 : newSVpvs_flags("", SvUTF8(sv));
2404 (void)hv_stores(GvHV(PL_hintgv), "open>", tmp);
2405 mg_set(tmp);
8b850bd5 2406
f747ebd6
Z
2407 tmp = newSVpvn_flags(start, out ? (STRLEN)(out - start) : len,
2408 SvUTF8(sv));
2409 (void)hv_stores(GvHV(PL_hintgv), "open<", tmp);
2410 mg_set(tmp);
ac27b0f5 2411 }
28f23441 2412 break;
79072805 2413 case '\020': /* ^P */
2fdbfb4d
AB
2414 if (*remaining == '\0') { /* ^P */
2415 PL_perldb = SvIV(sv);
2416 if (PL_perldb && !PL_DBsingle)
2417 init_debugger();
2418 break;
2419 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2420 goto do_prematch;
2421 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2422 goto do_postmatch;
2423 }
79072805 2424 case '\024': /* ^T */
88e89b8a 2425#ifdef BIG_TIME
6b88bc9c 2426 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2427#else
38ab35f8 2428 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2429#endif
79072805 2430 break;
e07ea26a
NC
2431 case '\025': /* ^UTF8CACHE */
2432 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2433 PL_utf8cache = (signed char) sv_2iv(sv);
2434 }
2435 break;
fde18df1 2436 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2437 if (*(mg->mg_ptr+1) == '\0') {
2438 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2439 i = SvIV(sv);
ac27b0f5 2440 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2441 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2442 }
599cee73 2443 }
0a378802 2444 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2445 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
d775746e
GS
2446 if (!SvPOK(sv) && PL_localizing) {
2447 sv_setpvn(sv, WARN_NONEstring, WARNsize);
d3a7d8c7 2448 PL_compiling.cop_warnings = pWARN_NONE;
d775746e
GS
2449 break;
2450 }
f4fc7782 2451 {
b5477537 2452 STRLEN len, i;
d3a7d8c7 2453 int accumulate = 0 ;
f4fc7782 2454 int any_fatals = 0 ;
b83604b4 2455 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2456 for (i = 0 ; i < len ; ++i) {
2457 accumulate |= ptr[i] ;
2458 any_fatals |= (ptr[i] & 0xAA) ;
2459 }
4243c432
NC
2460 if (!accumulate) {
2461 if (!specialWARN(PL_compiling.cop_warnings))
2462 PerlMemShared_free(PL_compiling.cop_warnings);
2463 PL_compiling.cop_warnings = pWARN_NONE;
2464 }
72dc9ed5
NC
2465 /* Yuck. I can't see how to abstract this: */
2466 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2467 WARN_ALL) && !any_fatals) {
4243c432
NC
2468 if (!specialWARN(PL_compiling.cop_warnings))
2469 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH
2470 PL_compiling.cop_warnings = pWARN_ALL;
2471 PL_dowarn |= G_WARN_ONCE ;
727405f8 2472 }
d3a7d8c7 2473 else {
72dc9ed5
NC
2474 STRLEN len;
2475 const char *const p = SvPV_const(sv, len);
2476
2477 PL_compiling.cop_warnings
8ee4cf24 2478 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2479 p, len);
2480
d3a7d8c7
GS
2481 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2482 PL_dowarn |= G_WARN_ONCE ;
2483 }
f4fc7782 2484
d3a7d8c7 2485 }
4438c4b7 2486 }
971a9dd3 2487 }
79072805
LW
2488 break;
2489 case '.':
3280af22
NIS
2490 if (PL_localizing) {
2491 if (PL_localizing == 1)
7766f137 2492 SAVESPTR(PL_last_in_gv);
748a9306 2493 }
3280af22 2494 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2495 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2496 break;
2497 case '^':
3280af22 2498 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
e1ec3a88 2499 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
f776e3cd 2500 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2501 break;
2502 case '~':
3280af22 2503 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
e1ec3a88 2504 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
f776e3cd 2505 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2506 break;
2507 case '=':
38ab35f8 2508 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2509 break;
2510 case '-':
38ab35f8 2511 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
3280af22
NIS
2512 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2513 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2514 break;
2515 case '%':
38ab35f8 2516 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2517 break;
2518 case '|':
4b65379b 2519 {
8772537c 2520 IO * const io = GvIOp(PL_defoutgv);
720f287d
AB
2521 if(!io)
2522 break;
38ab35f8 2523 if ((SvIV(sv)) == 0)
4b65379b
CS
2524 IoFLAGS(io) &= ~IOf_FLUSH;
2525 else {
2526 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2527 PerlIO *ofp = IoOFP(io);
2528 if (ofp)
2529 (void)PerlIO_flush(ofp);
2530 IoFLAGS(io) |= IOf_FLUSH;
2531 }
2532 }
79072805
LW
2533 }
2534 break;
79072805 2535 case '/':
3280af22 2536 SvREFCNT_dec(PL_rs);
8bfdd7d9 2537 PL_rs = newSVsv(sv);
79072805
LW
2538 break;
2539 case '\\':
7889fe52
NIS
2540 if (PL_ors_sv)
2541 SvREFCNT_dec(PL_ors_sv);
009c130f 2542 if (SvOK(sv) || SvGMAGICAL(sv)) {
7889fe52 2543 PL_ors_sv = newSVsv(sv);
009c130f 2544 }
e3c19b7b 2545 else {
a0714e2c 2546 PL_ors_sv = NULL;
e3c19b7b 2547 }
79072805 2548 break;
79072805 2549 case '[':
38ab35f8 2550 CopARYBASE_set(&PL_compiling, SvIV(sv));
79072805
LW
2551 break;
2552 case '?':
ff0cee69 2553#ifdef COMPLEX_STATUS
6b88bc9c 2554 if (PL_localizing == 2) {
41cb7b2b 2555 SvUPGRADE(sv, SVt_PVLV);
6b88bc9c
GS
2556 PL_statusvalue = LvTARGOFF(sv);
2557 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2558 }
2559 else
2560#endif
2561#ifdef VMSISH_STATUS
2562 if (VMSISH_STATUS)
fb38d079 2563 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2564 else
2565#endif
38ab35f8 2566 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2567 break;
2568 case '!':
93189314
JH
2569 {
2570#ifdef VMS
2571# define PERL_VMS_BANG vaxc$errno
2572#else
2573# define PERL_VMS_BANG 0
2574#endif
91487cfc 2575 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314
JH
2576 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2577 }
79072805
LW
2578 break;
2579 case '<':
38ab35f8 2580 PL_uid = SvIV(sv);
3280af22
NIS
2581 if (PL_delaymagic) {
2582 PL_delaymagic |= DM_RUID;
79072805
LW
2583 break; /* don't do magic till later */
2584 }
2585#ifdef HAS_SETRUID
b28d0864 2586 (void)setruid((Uid_t)PL_uid);
79072805
LW
2587#else
2588#ifdef HAS_SETREUID
3280af22 2589 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
748a9306 2590#else
85e6fe83 2591#ifdef HAS_SETRESUID
b28d0864 2592 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2593#else
75870ed3 2594 if (PL_uid == PL_euid) { /* special case $< = $> */
2595#ifdef PERL_DARWIN
2596 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2597 if (PL_uid != 0 && PerlProc_getuid() == 0)
2598 (void)PerlProc_setuid(0);
2599#endif
b28d0864 2600 (void)PerlProc_setuid(PL_uid);
75870ed3 2601 } else {
d8eceb89 2602 PL_uid = PerlProc_getuid();
cea2e8a9 2603 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2604 }
79072805
LW
2605#endif
2606#endif
85e6fe83 2607#endif
d8eceb89 2608 PL_uid = PerlProc_getuid();
3280af22 2609 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2610 break;
2611 case '>':
38ab35f8 2612 PL_euid = SvIV(sv);
3280af22
NIS
2613 if (PL_delaymagic) {
2614 PL_delaymagic |= DM_EUID;
79072805
LW
2615 break; /* don't do magic till later */
2616 }
2617#ifdef HAS_SETEUID
3280af22 2618 (void)seteuid((Uid_t)PL_euid);
79072805
LW
2619#else
2620#ifdef HAS_SETREUID
b28d0864 2621 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
85e6fe83
LW
2622#else
2623#ifdef HAS_SETRESUID
6b88bc9c 2624 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
79072805 2625#else
b28d0864
NIS
2626 if (PL_euid == PL_uid) /* special case $> = $< */
2627 PerlProc_setuid(PL_euid);
a0d0e21e 2628 else {
e8ee3774 2629 PL_euid = PerlProc_geteuid();
cea2e8a9 2630 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2631 }
79072805
LW
2632#endif
2633#endif
85e6fe83 2634#endif
d8eceb89 2635 PL_euid = PerlProc_geteuid();
3280af22 2636 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2637 break;
2638 case '(':
38ab35f8 2639 PL_gid = SvIV(sv);
3280af22
NIS
2640 if (PL_delaymagic) {
2641 PL_delaymagic |= DM_RGID;
79072805
LW
2642 break; /* don't do magic till later */
2643 }
2644#ifdef HAS_SETRGID
b28d0864 2645 (void)setrgid((Gid_t)PL_gid);
79072805
LW
2646#else
2647#ifdef HAS_SETREGID
3280af22 2648 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
85e6fe83
LW
2649#else
2650#ifdef HAS_SETRESGID
b28d0864 2651 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
79072805 2652#else
b28d0864
NIS
2653 if (PL_gid == PL_egid) /* special case $( = $) */
2654 (void)PerlProc_setgid(PL_gid);
748a9306 2655 else {
d8eceb89 2656 PL_gid = PerlProc_getgid();
cea2e8a9 2657 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2658 }
79072805
LW
2659#endif
2660#endif
85e6fe83 2661#endif
d8eceb89 2662 PL_gid = PerlProc_getgid();
3280af22 2663 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2664 break;
2665 case ')':
5cd24f17
PP
2666#ifdef HAS_SETGROUPS
2667 {
b83604b4 2668 const char *p = SvPV_const(sv, len);
757f63d8
SP
2669 Groups_t *gary = NULL;
2670
2671 while (isSPACE(*p))
2672 ++p;
2673 PL_egid = Atol(p);
2674 for (i = 0; i < NGROUPS; ++i) {
2675 while (*p && !isSPACE(*p))
2676 ++p;
2677 while (isSPACE(*p))
2678 ++p;
2679 if (!*p)
2680 break;
2681 if(!gary)
2682 Newx(gary, i + 1, Groups_t);
2683 else
2684 Renew(gary, i + 1, Groups_t);
2685 gary[i] = Atol(p);
2686 }
2687 if (i)
2688 (void)setgroups(i, gary);
f5a63d97 2689 Safefree(gary);
5cd24f17
PP
2690 }
2691#else /* HAS_SETGROUPS */
38ab35f8 2692 PL_egid = SvIV(sv);
5cd24f17 2693#endif /* HAS_SETGROUPS */
3280af22
NIS
2694 if (PL_delaymagic) {
2695 PL_delaymagic |= DM_EGID;
79072805
LW
2696 break; /* don't do magic till later */
2697 }
2698#ifdef HAS_SETEGID
3280af22 2699 (void)setegid((Gid_t)PL_egid);
79072805
LW
2700#else
2701#ifdef HAS_SETREGID
b28d0864 2702 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
85e6fe83
LW
2703#else
2704#ifdef HAS_SETRESGID
b28d0864 2705 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
79072805 2706#else
b28d0864
NIS
2707 if (PL_egid == PL_gid) /* special case $) = $( */
2708 (void)PerlProc_setgid(PL_egid);
748a9306 2709 else {
d8eceb89 2710 PL_egid = PerlProc_getegid();
cea2e8a9 2711 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2712 }
79072805
LW
2713#endif
2714#endif
85e6fe83 2715#endif
d8eceb89 2716 PL_egid = PerlProc_getegid();
3280af22 2717 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2718 break;
2719 case ':':
2d8e6c8d 2720 PL_chopset = SvPV_force(sv,len);
79072805
LW
2721 break;
2722 case '0':
e2975953 2723 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS
2724#ifdef HAS_SETPROCTITLE
2725 /* The BSDs don't show the argv[] in ps(1) output, they
2726 * show a string from the process struct and provide
2727 * the setproctitle() routine to manipulate that. */
a2722ac9 2728 if (PL_origalen != 1) {
b83604b4 2729 s = SvPV_const(sv, len);
98b76f99 2730# if __FreeBSD_version > 410001
9aad2c0e 2731 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS
2732 * but not the "(perl) suffix from the ps(1)
2733 * output, because that's what ps(1) shows if the
2734 * argv[] is modified. */
6f2ad931 2735 setproctitle("-%s", s);
9aad2c0e 2736# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS
2737 /* This doesn't really work if you assume that
2738 * $0 = 'foobar'; will wipe out 'perl' from the $0
2739 * because in ps(1) output the result will be like
2740 * sprintf("perl: %s (perl)", s)
2741 * I guess this is a security feature:
2742 * one (a user process) cannot get rid of the original name.
2743 * --jhi */
2744 setproctitle("%s", s);
2745# endif
2746 }
9d3968b2 2747#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 2748 if (PL_origalen != 1) {
17aa7f3d 2749 union pstun un;
b83604b4 2750 s = SvPV_const(sv, len);
6867be6d 2751 un.pst_command = (char *)s;
17aa7f3d
JH
2752 pstat(PSTAT_SETCMD, un, len, 0, 0);
2753 }
9d3968b2 2754#else
2d2af554
GA
2755 if (PL_origalen > 1) {
2756 /* PL_origalen is set in perl_parse(). */
2757 s = SvPV_force(sv,len);
2758 if (len >= (STRLEN)PL_origalen-1) {
2759 /* Longer than original, will be truncated. We assume that
2760 * PL_origalen bytes are available. */
2761 Copy(s, PL_origargv[0], PL_origalen-1, char);
2762 }
2763 else {
2764 /* Shorter than original, will be padded. */
235ac35d 2765#ifdef PERL_DARWIN
60777a0d
JH
2766 /* Special case for Mac OS X: see [perl #38868] */
2767 const int pad = 0;
235ac35d 2768#else
8a89a4f1
MB
2769 /* Is the space counterintuitive? Yes.
2770 * (You were expecting \0?)
2771 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2772 * --jhi */
60777a0d 2773 const int pad = ' ';
235ac35d 2774#endif
60777a0d
JH
2775 Copy(s, PL_origargv[0], len, char);
2776 PL_origargv[0][len] = 0;
2777 memset(PL_origargv[0] + len + 1,
2778 pad, PL_origalen - len - 1);
2d2af554
GA
2779 }
2780 PL_origargv[0][PL_origalen-1] = 0;
2781 for (i = 1; i < PL_origargc; i++)
2782 PL_origargv[i] = 0;
79072805 2783 }
9d3968b2 2784#endif
e2975953 2785 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
2786 break;
2787 }
2788 return 0;
2789}
2790
2791I32
35a4481c 2792Perl_whichsig(pTHX_ const char *sig)
79072805 2793{
aadb217d 2794 register char* const* sigv;
7918f24d
NC
2795
2796 PERL_ARGS_ASSERT_WHICHSIG;
96a5add6 2797 PERL_UNUSED_CONTEXT;
79072805 2798
aadb217d 2799 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
79072805 2800 if (strEQ(sig,*sigv))
aadb217d 2801 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805
LW
2802#ifdef SIGCLD
2803 if (strEQ(sig,"CHLD"))
2804 return SIGCLD;
2805#endif
2806#ifdef SIGCHLD
2807 if (strEQ(sig,"CLD"))
2808 return SIGCHLD;
2809#endif
7f1236c0 2810 return -1;
79072805
LW
2811}
2812
ecfc5424 2813Signal_t
1e82f5a6 2814#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 2815Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
1e82f5a6
SH
2816#else
2817Perl_sighandler(int sig)
2818#endif
79072805 2819{
1018e26f
NIS
2820#ifdef PERL_GET_SIG_CONTEXT
2821 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 2822#else
cea2e8a9 2823 dTHX;
71d280e3 2824#endif
79072805 2825 dSP;
a0714e2c
SS
2826 GV *gv = NULL;
2827 SV *sv = NULL;
8772537c 2828 SV * const tSv = PL_Sv;
601f1833 2829 CV *cv = NULL;
533c011a 2830 OP *myop = PL_op;
84902520 2831 U32 flags = 0;
8772537c 2832 XPV * const tXpv = PL_Xpv;
71d280e3 2833
3280af22 2834 if (PL_savestack_ix + 15 <= PL_savestack_max)
84902520 2835 flags |= 1;
3280af22 2836 if (PL_markstack_ptr < PL_markstack_max - 2)
84902520 2837 flags |= 4;
3280af22 2838 if (PL_scopestack_ix < PL_scopestack_max - 3)
84902520
TB
2839 flags |= 16;
2840
727405f8 2841 if (!PL_psig_ptr[sig]) {
99ef548b 2842 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
2843 PL_sig_name[sig]);
2844 exit(sig);
2845 }
ff0cee69 2846
84902520
TB
2847 /* Max number of items pushed there is 3*n or 4. We cannot fix
2848 infinity, so we fix 4 (in fact 5): */
2849 if (flags & 1) {
3280af22 2850 PL_savestack_ix += 5; /* Protect save in progress. */
8772537c 2851 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
84902520 2852 }
ac27b0f5 2853 if (flags & 4)
3280af22 2854 PL_markstack_ptr++; /* Protect mark. */
84902520 2855 if (flags & 16)
3280af22 2856 PL_scopestack_ix += 1;
84902520 2857 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 2858 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
2859 || SvTYPE(cv) != SVt_PVCV) {
2860 HV *st;
f2c0649b 2861 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 2862 }
84902520 2863
a0d0e21e 2864 if (!cv || !CvROOT(cv)) {
a2a5de95
NC
2865 Perl_ck_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2866 PL_sig_name[sig], (gv ? GvENAME(gv)
2867 : ((cv && CvGV(cv))
2868 ? GvENAME(CvGV(cv))
2869 : "__ANON__")));
00d579c5 2870 goto cleanup;
79072805
LW
2871 }
2872
22c35a8c 2873 if(PL_psig_name[sig]) {
b37c2d43 2874 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
84902520 2875 flags |= 64;
df3728a2 2876#if !defined(PERL_IMPLICIT_CONTEXT)
27da23d5 2877 PL_sig_sv = sv;
df3728a2 2878#endif
84902520 2879 } else {
ff0cee69 2880 sv = sv_newmortal();
22c35a8c 2881 sv_setpv(sv,PL_sig_name[sig]);
88e89b8a 2882 }
e336de0d 2883
e788e7d3 2884 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 2885 PUSHMARK(SP);
79072805 2886 PUSHs(sv);
8aad04aa
JH
2887#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2888 {
2889 struct sigaction oact;
2890
2891 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
2892 if (sip) {
2893 HV *sih = newHV();
ad64d0ec 2894 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
2895 /* The siginfo fields signo, code, errno, pid, uid,
2896 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
2897 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2898 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 2899#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
2900 hv_stores(sih, "errno", newSViv(sip->si_errno));
2901 hv_stores(sih, "status", newSViv(sip->si_status));
2902 hv_stores(sih, "uid", newSViv(sip->si_uid));
2903 hv_stores(sih, "pid", newSViv(sip->si_pid));
2904 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2905 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 2906#endif
8aad04aa 2907 EXTEND(SP, 2);
ad64d0ec 2908 PUSHs(rv);
22f1178f 2909 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 2910 }
b4552a27 2911
8aad04aa
JH
2912 }
2913 }
2914#endif
79072805 2915 PUTBACK;
a0d0e21e 2916
ad64d0ec 2917 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 2918
d3acc0f7 2919 POPSTACK;
1b266415 2920 if (SvTRUE(ERRSV)) {
1d615522 2921#ifndef PERL_MICRO
983dbef6 2922#ifdef HAS_SIGPROCMASK
1b266415
NIS
2923 /* Handler "died", for example to get out of a restart-able read().
2924 * Before we re-do that on its behalf re-enable the signal which was
2925 * blocked by the system when we entered.
2926 */
2927 sigset_t set;
2928 sigemptyset(&set);
2929 sigaddset(&set,sig);
2930 sigprocmask(SIG_UNBLOCK, &set, NULL);
2931#else
2932 /* Not clear if this will work */
2933 (void)rsignal(sig, SIG_IGN);
5c1546dc 2934 (void)rsignal(sig, PL_csighandlerp);
1b266415 2935#endif
1d615522 2936#endif /* !PERL_MICRO */
bd61b366 2937 Perl_die(aTHX_ NULL);
1b266415 2938 }
00d579c5 2939cleanup:
84902520 2940 if (flags & 1)
3280af22 2941 PL_savestack_ix -= 8; /* Unprotect save in progress. */
ac27b0f5 2942 if (flags & 4)
3280af22 2943 PL_markstack_ptr--;
84902520 2944 if (flags & 16)
3280af22 2945 PL_scopestack_ix -= 1;
84902520
TB
2946 if (flags & 64)
2947 SvREFCNT_dec(sv);
533c011a 2948 PL_op = myop; /* Apparently not needed... */
ac27b0f5 2949
3280af22
NIS
2950 PL_Sv = tSv; /* Restore global temporaries. */
2951 PL_Xpv = tXpv;
53bb94e2 2952 return;
79072805 2953}
4e35701f
NIS
2954
2955
51371543 2956static void
8772537c 2957S_restore_magic(pTHX_ const void *p)
51371543 2958{
97aff369 2959 dVAR;
8772537c
AL
2960 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
2961 SV* const sv = mgs->mgs_sv;
51371543
GS
2962
2963 if (!sv)
2964 return;
2965
2966 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
2967 {
f8c7b90f 2968#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC
2969 /* While magic was saved (and off) sv_setsv may well have seen
2970 this SV as a prime candidate for COW. */
2971 if (SvIsCOW(sv))
e424a81e 2972 sv_force_normal_flags(sv, 0);
f9701176
NC
2973#endif
2974
51371543
GS
2975 if (mgs->mgs_flags)
2976 SvFLAGS(sv) |= mgs->mgs_flags;
2977 else
2978 mg_magical(sv);
2b77b520
YST
2979 if (SvGMAGICAL(sv)) {
2980 /* downgrade public flags to private,
2981 and discard any other private flags */
2982
10edeb5d
JH
2983 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
2984 if (pubflags) {
2985 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
2986 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
2b77b520
YST
2987 }
2988 }
51371543
GS
2989 }
2990
2991 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
2992
2993 /* If we're still on top of the stack, pop us off. (That condition
2994 * will be satisfied if restore_magic was called explicitly, but *not*
2995 * if it's being called via leave_scope.)
2996 * The reason for doing this is that otherwise, things like sv_2cv()
2997 * may leave alloc gunk on the savestack, and some code
2998 * (e.g. sighandler) doesn't expect that...
2999 */
3000 if (PL_savestack_ix == mgs->mgs_ss_ix)
3001 {
3002 I32 popval = SSPOPINT;
c76ac1ee 3003 assert(popval == SAVEt_DESTRUCTOR_X);
51371543
GS
3004 PL_savestack_ix -= 2;
3005 popval = SSPOPINT;
3006 assert(popval == SAVEt_ALLOC);
3007 popval = SSPOPINT;
3008 PL_savestack_ix -= popval;
3009 }
3010
3011}
3012
3013static void
8772537c 3014S_unwind_handler_stack(pTHX_ const void *p)
51371543 3015{
27da23d5 3016 dVAR;
e1ec3a88 3017 const U32 flags = *(const U32*)p;
51371543 3018
7918f24d
NC
3019 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3020
51371543
GS
3021 if (flags & 1)
3022 PL_savestack_ix -= 5; /* Unprotect save in progress. */
df3728a2 3023#if !defined(PERL_IMPLICIT_CONTEXT)
51371543 3024 if (flags & 64)
27da23d5 3025 SvREFCNT_dec(PL_sig_sv);
df3728a2 3026#endif
51371543 3027}
1018e26f 3028
66610fdd 3029/*
b3ca2e83
NC
3030=for apidoc magic_sethint
3031
3032Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC
3033C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3034anything that would need a deep copy. Maybe we should warn if we find a
3035reference.
b3ca2e83
NC
3036
3037=cut
3038*/
3039int
3040Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3041{
3042 dVAR;
ad64d0ec 3043 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3044 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3045
7918f24d
NC
3046 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3047
e6e3e454
NC
3048 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3049 an alternative leaf in there, with PL_compiling.cop_hints being used if
3050 it's NULL. If needed for threads, the alternative could lock a mutex,
3051 or take other more complex action. */
3052
5b9c0671
NC
3053 /* Something changed in %^H, so it will need to be restored on scope exit.
3054 Doing this here saves a lot of doing it manually in perl code (and
3055 forgetting to do it, and consequent subtle errors. */
3056 PL_hints |= HINT_LOCALIZE_HH;
c28fe1ec 3057 PL_compiling.cop_hints_hash
fc92a12d 3058 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
b3ca2e83
NC
3059 return 0;
3060}
3061
3062/*
f175cff5 3063=for apidoc magic_clearhint
b3ca2e83 3064
c28fe1ec
NC
3065Triggered by a delete from %^H, records the key to
3066C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC
3067
3068=cut
3069*/
3070int
3071Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3072{
3073 dVAR;
7918f24d
NC
3074
3075 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL
3076 PERL_UNUSED_ARG(sv);
3077
b3ca2e83
NC
3078 assert(mg->mg_len == HEf_SVKEY);
3079
b3f24c00
MHM
3080 PERL_UNUSED_ARG(sv);
3081
5b9c0671 3082 PL_hints |= HINT_LOCALIZE_HH;
c28fe1ec
NC
3083 PL_compiling.cop_hints_hash
3084 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
ad64d0ec 3085 MUTABLE_SV(mg->mg_ptr), &PL_sv_placeholder);
b3ca2e83
NC
3086 return 0;
3087}
3088
3089/*
f747ebd6
Z
3090=for apidoc magic_clearhints
3091
3092Triggered by clearing %^H, resets C<PL_compiling.cop_hints_hash>.
3093
3094=cut
3095*/
3096int
3097Perl_magic_clearhints(pTHX_ SV *sv, MAGIC *mg)
3098{
3099 PERL_ARGS_ASSERT_MAGIC_CLEARHINTS;
3100 PERL_UNUSED_ARG(sv);
3101 PERL_UNUSED_ARG(mg);
3102 if (PL_compiling.cop_hints_hash) {
3103 Perl_refcounted_he_free(aTHX_ PL_compiling.cop_hints_hash);
3104 PL_compiling.cop_hints_hash = NULL;
3105 }
3106 return 0;
3107}
3108
3109/*
66610fdd
RGS
3110 * Local variables:
3111 * c-indentation-style: bsd
3112 * c-basic-offset: 4
3113 * indent-tabs-mode: t
3114 * End:
3115 *
37442d52
RGS
3116 * ex: set ts=8 sts=4 sw=4 noet:
3117 */