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Merge the bulk of Perl_magic_clearsig() into Perl_magic_setsig().
[perl5.git] / mg.c
CommitLineData
a0d0e21e 1/* mg.c
79072805 2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
4ac71550
TC
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
14 *
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
79072805
LW
16 */
17
ccfc67b7
JH
18/*
19=head1 Magical Functions
166f8a29
DM
20
21"Magic" is special data attached to SV structures in order to give them
22"magical" properties. When any Perl code tries to read from, or assign to,
23an SV marked as magical, it calls the 'get' or 'set' function associated
24with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 25give it a chance to update its internal value (get on $. writes the line
166f8a29
DM
26number of the last read filehandle into to the SV's IV slot), while
27set is called after an SV has been written to, in order to allow it to make
ddfa107c 28use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
29PL_rs global variable).
30
31Magic is implemented as a linked list of MAGIC structures attached to the
32SV. Each MAGIC struct holds the type of the magic, a pointer to an array
33of functions that implement the get(), set(), length() etc functions,
34plus space for some flags and pointers. For example, a tied variable has
35a MAGIC structure that contains a pointer to the object associated with the
36tie.
37
ccfc67b7
JH
38*/
39
79072805 40#include "EXTERN.h"
864dbfa3 41#define PERL_IN_MG_C
79072805
LW
42#include "perl.h"
43
5cd24f17 44#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
45# ifdef I_GRP
46# include <grp.h>
47# endif
188ea221
CS
48#endif
49
757f63d8
SP
50#if defined(HAS_SETGROUPS)
51# ifndef NGROUPS
52# define NGROUPS 32
53# endif
54#endif
55
17aa7f3d
JH
56#ifdef __hpux
57# include <sys/pstat.h>
58#endif
59
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;
463ee0b2 386
7918f24d
NC
387 PERL_ARGS_ASSERT_MG_CLEAR;
388
455ece5e 389 save_magic(mgs_ix, sv);
463ee0b2 390
79072805 391 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 392 const MGVTBL* const vtbl = mg->mg_virtual;
a0d0e21e 393 /* omit GSKIP -- never set here */
727405f8 394
2b260de0 395 if (vtbl && vtbl->svt_clear)
fc0dc3b3 396 CALL_FPTR(vtbl->svt_clear)(aTHX_ sv, mg);
79072805 397 }
463ee0b2 398
8772537c 399 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
400 return 0;
401}
402
954c1994
GS
403/*
404=for apidoc mg_find
405
406Finds the magic pointer for type matching the SV. See C<sv_magic>.
407
408=cut
409*/
410
93a17b20 411MAGIC*
35a4481c 412Perl_mg_find(pTHX_ const SV *sv, int type)
93a17b20 413{
96a5add6 414 PERL_UNUSED_CONTEXT;
35a4481c
AL
415 if (sv) {
416 MAGIC *mg;
417 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
418 if (mg->mg_type == type)
419 return mg;
420 }
93a17b20 421 }
5f66b61c 422 return NULL;
93a17b20
LW
423}
424
954c1994
GS
425/*
426=for apidoc mg_copy
427
428Copies the magic from one SV to another. See C<sv_magic>.
429
430=cut
431*/
432
79072805 433int
864dbfa3 434Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
79072805 435{
463ee0b2 436 int count = 0;
79072805 437 MAGIC* mg;
7918f24d
NC
438
439 PERL_ARGS_ASSERT_MG_COPY;
440
463ee0b2 441 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 442 const MGVTBL* const vtbl = mg->mg_virtual;
68795e93
NIS
443 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
444 count += CALL_FPTR(vtbl->svt_copy)(aTHX_ sv, mg, nsv, key, klen);
445 }
823a54a3
AL
446 else {
447 const char type = mg->mg_type;
1e73acc8 448 if (isUPPER(type) && type != PERL_MAGIC_uvar) {
823a54a3
AL
449 sv_magic(nsv,
450 (type == PERL_MAGIC_tied)
451 ? SvTIED_obj(sv, mg)
452 : (type == PERL_MAGIC_regdata && mg->mg_obj)
453 ? sv
454 : mg->mg_obj,
455 toLOWER(type), key, klen);
456 count++;
457 }
79072805 458 }
79072805 459 }
463ee0b2 460 return count;
79072805
LW
461}
462
954c1994 463/*
0cbee0a4
DM
464=for apidoc mg_localize
465
9711599e
CS
466Copy some of the magic from an existing SV to new localized version of that
467SV. Container magic (eg %ENV, $1, tie) gets copied, value magic doesn't (eg
468taint, pos).
469
af7df257 470If setmagic is false then no set magic will be called on the new (empty) SV.
9711599e
CS
471This typically means that assignment will soon follow (e.g. 'local $x = $y'),
472and that will handle the magic.
0cbee0a4
DM
473
474=cut
475*/
476
477void
af7df257 478Perl_mg_localize(pTHX_ SV *sv, SV *nsv, bool setmagic)
0cbee0a4 479{
97aff369 480 dVAR;
0cbee0a4 481 MAGIC *mg;
7918f24d
NC
482
483 PERL_ARGS_ASSERT_MG_LOCALIZE;
484
0cbee0a4 485 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
2b1b43ea 486 const MGVTBL* const vtbl = mg->mg_virtual;
2767dea0 487 if (!S_is_container_magic(mg))
0cbee0a4 488 continue;
0cbee0a4 489
a5063e7c
DM
490 if ((mg->mg_flags & MGf_LOCAL) && vtbl->svt_local)
491 (void)CALL_FPTR(vtbl->svt_local)(aTHX_ nsv, mg);
492 else
0cbee0a4
DM
493 sv_magicext(nsv, mg->mg_obj, mg->mg_type, vtbl,
494 mg->mg_ptr, mg->mg_len);
a5063e7c 495
0cbee0a4
DM
496 /* container types should remain read-only across localization */
497 SvFLAGS(nsv) |= SvREADONLY(sv);
498 }
499
500 if (SvTYPE(nsv) >= SVt_PVMG && SvMAGIC(nsv)) {
501 SvFLAGS(nsv) |= SvMAGICAL(sv);
af7df257 502 if (setmagic) {
9711599e
CS
503 PL_localizing = 1;
504 SvSETMAGIC(nsv);
505 PL_localizing = 0;
506 }
0cbee0a4
DM
507 }
508}
509
510/*
954c1994
GS
511=for apidoc mg_free
512
513Free any magic storage used by the SV. See C<sv_magic>.
514
515=cut
516*/
517
79072805 518int
864dbfa3 519Perl_mg_free(pTHX_ SV *sv)
79072805
LW
520{
521 MAGIC* mg;
522 MAGIC* moremagic;
7918f24d
NC
523
524 PERL_ARGS_ASSERT_MG_FREE;
525
79072805 526 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
35a4481c 527 const MGVTBL* const vtbl = mg->mg_virtual;
79072805 528 moremagic = mg->mg_moremagic;
2b260de0 529 if (vtbl && vtbl->svt_free)
fc0dc3b3 530 CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg);
14befaf4 531 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
979acdb5 532 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
88e89b8a 533 Safefree(mg->mg_ptr);
565764a8 534 else if (mg->mg_len == HEf_SVKEY)
ad64d0ec 535 SvREFCNT_dec(MUTABLE_SV(mg->mg_ptr));
d460ef45 536 }
b881518d
JH
537 if (mg->mg_flags & MGf_REFCOUNTED)
538 SvREFCNT_dec(mg->mg_obj);
79072805 539 Safefree(mg);
c826f41b 540 SvMAGIC_set(sv, moremagic);
79072805 541 }
b162af07 542 SvMAGIC_set(sv, NULL);
68f8932e 543 SvMAGICAL_off(sv);
79072805
LW
544 return 0;
545}
546
79072805 547#include <signal.h>
79072805 548
942e002e 549U32
864dbfa3 550Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 551{
97aff369 552 dVAR;
8772537c 553 PERL_UNUSED_ARG(sv);
6cef1e77 554
7918f24d
NC
555 PERL_ARGS_ASSERT_MAGIC_REGDATA_CNT;
556
0bd48802
AL
557 if (PL_curpm) {
558 register const REGEXP * const rx = PM_GETRE(PL_curpm);
559 if (rx) {
a678b0e4
YO
560 if (mg->mg_obj) { /* @+ */
561 /* return the number possible */
07bc277f 562 return RX_NPARENS(rx);
a678b0e4 563 } else { /* @- */
07bc277f 564 I32 paren = RX_LASTPAREN(rx);
a678b0e4
YO
565
566 /* return the last filled */
f46c4081 567 while ( paren >= 0
07bc277f
NC
568 && (RX_OFFS(rx)[paren].start == -1
569 || RX_OFFS(rx)[paren].end == -1) )
f46c4081 570 paren--;
a678b0e4
YO
571 return (U32)paren;
572 }
0bd48802 573 }
8f580fb8 574 }
ac27b0f5 575
942e002e 576 return (U32)-1;
6cef1e77
IZ
577}
578
579int
864dbfa3 580Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
6cef1e77 581{
97aff369 582 dVAR;
7918f24d
NC
583
584 PERL_ARGS_ASSERT_MAGIC_REGDATUM_GET;
585
0bd48802
AL
586 if (PL_curpm) {
587 register const REGEXP * const rx = PM_GETRE(PL_curpm);
588 if (rx) {
589 register const I32 paren = mg->mg_len;
590 register I32 s;
591 register I32 t;
592 if (paren < 0)
593 return 0;
07bc277f
NC
594 if (paren <= (I32)RX_NPARENS(rx) &&
595 (s = RX_OFFS(rx)[paren].start) != -1 &&
596 (t = RX_OFFS(rx)[paren].end) != -1)
0bd48802
AL
597 {
598 register I32 i;
599 if (mg->mg_obj) /* @+ */
600 i = t;
601 else /* @- */
602 i = s;
603
604 if (i > 0 && RX_MATCH_UTF8(rx)) {
07bc277f 605 const char * const b = RX_SUBBEG(rx);
0bd48802 606 if (b)
f5a63d97 607 i = utf8_length((U8*)b, (U8*)(b+i));
0bd48802 608 }
727405f8 609
0bd48802 610 sv_setiv(sv, i);
1aa99e6b 611 }
0bd48802 612 }
6cef1e77
IZ
613 }
614 return 0;
615}
616
e4b89193 617int
a29d06ed
MG
618Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
619{
7918f24d 620 PERL_ARGS_ASSERT_MAGIC_REGDATUM_SET;
d4c19fe8
AL
621 PERL_UNUSED_ARG(sv);
622 PERL_UNUSED_ARG(mg);
f1f66076 623 Perl_croak(aTHX_ "%s", PL_no_modify);
0dbb1585 624 NORETURN_FUNCTION_END;
a29d06ed
MG
625}
626
93a17b20 627U32
864dbfa3 628Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
93a17b20 629{
97aff369 630 dVAR;
93a17b20 631 register I32 paren;
93a17b20 632 register I32 i;
2fdbfb4d
AB
633 register const REGEXP * rx;
634 const char * const remaining = mg->mg_ptr + 1;
93a17b20 635
7918f24d
NC
636 PERL_ARGS_ASSERT_MAGIC_LEN;
637
93a17b20 638 switch (*mg->mg_ptr) {
2fdbfb4d
AB
639 case '\020':
640 if (*remaining == '\0') { /* ^P */
641 break;
642 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
643 goto do_prematch;
644 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
645 goto do_postmatch;
646 }
647 break;
648 case '\015': /* $^MATCH */
649 if (strEQ(remaining, "ATCH")) {
650 goto do_match;
651 } else {
652 break;
653 }
654 case '`':
655 do_prematch:
f1b875a0 656 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB
657 goto maybegetparen;
658 case '\'':
659 do_postmatch:
f1b875a0 660 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB
661 goto maybegetparen;
662 case '&':
663 do_match:
f1b875a0 664 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d 665 goto maybegetparen;
93a17b20 666 case '1': case '2': case '3': case '4':
2fdbfb4d
AB
667 case '5': case '6': case '7': case '8': case '9':
668 paren = atoi(mg->mg_ptr);
669 maybegetparen:
aaa362c4 670 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d
AB
671 getparen:
672 i = CALLREG_NUMBUF_LENGTH((REGEXP * const)rx, sv, paren);
cf93c79d 673
ffc61ed2 674 if (i < 0)
0844c848 675 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
ffc61ed2 676 return i;
2fdbfb4d 677 } else {
235bddc8 678 if (ckWARN(WARN_UNINITIALIZED))
29489e7c 679 report_uninit(sv);
2fdbfb4d 680 return 0;
93a17b20 681 }
93a17b20 682 case '+':
aaa362c4 683 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f 684 paren = RX_LASTPAREN(rx);
13f57bf8
CS
685 if (paren)
686 goto getparen;
93a17b20 687 }
748a9306 688 return 0;
a01268b5
JH
689 case '\016': /* ^N */
690 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f 691 paren = RX_LASTCLOSEPAREN(rx);
a01268b5
JH
692 if (paren)
693 goto getparen;
694 }
695 return 0;
93a17b20
LW
696 }
697 magic_get(sv,mg);
2d8e6c8d 698 if (!SvPOK(sv) && SvNIOK(sv)) {
8b6b16e7 699 sv_2pv(sv, 0);
2d8e6c8d 700 }
93a17b20
LW
701 if (SvPOK(sv))
702 return SvCUR(sv);
703 return 0;
704}
705
ad3296c6 706#define SvRTRIM(sv) STMT_START { \
eae92ea0
GA
707 if (SvPOK(sv)) { \
708 STRLEN len = SvCUR(sv); \
709 char * const p = SvPVX(sv); \
8e6b4db6
PC
710 while (len > 0 && isSPACE(p[len-1])) \
711 --len; \
712 SvCUR_set(sv, len); \
713 p[len] = '\0'; \
714 } \
ad3296c6
SH
715} STMT_END
716
8b850bd5
NC
717void
718Perl_emulate_cop_io(pTHX_ const COP *const c, SV *const sv)
719{
7918f24d
NC
720 PERL_ARGS_ASSERT_EMULATE_COP_IO;
721
8b850bd5
NC
722 if (!(CopHINTS_get(c) & (HINT_LEXICAL_IO_IN|HINT_LEXICAL_IO_OUT)))
723 sv_setsv(sv, &PL_sv_undef);
724 else {
725 sv_setpvs(sv, "");
726 SvUTF8_off(sv);
727 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_IN)) {
728 SV *const value = Perl_refcounted_he_fetch(aTHX_
729 c->cop_hints_hash,
730 0, "open<", 5, 0, 0);
731 assert(value);
732 sv_catsv(sv, value);
733 }
734 sv_catpvs(sv, "\0");
735 if ((CopHINTS_get(c) & HINT_LEXICAL_IO_OUT)) {
736 SV *const value = Perl_refcounted_he_fetch(aTHX_
737 c->cop_hints_hash,
738 0, "open>", 5, 0, 0);
739 assert(value);
740 sv_catsv(sv, value);
741 }
742 }
743}
744
79072805 745int
864dbfa3 746Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
79072805 747{
27da23d5 748 dVAR;
79072805 749 register I32 paren;
35272f84 750 register char *s = NULL;
d9f97599 751 register REGEXP *rx;
823a54a3
AL
752 const char * const remaining = mg->mg_ptr + 1;
753 const char nextchar = *remaining;
79072805 754
7918f24d
NC
755 PERL_ARGS_ASSERT_MAGIC_GET;
756
79072805 757 switch (*mg->mg_ptr) {
748a9306 758 case '\001': /* ^A */
3280af22 759 sv_setsv(sv, PL_bodytarget);
748a9306 760 break;
e5218da5 761 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
823a54a3 762 if (nextchar == '\0') {
e5218da5
GA
763 sv_setiv(sv, (IV)PL_minus_c);
764 }
823a54a3 765 else if (strEQ(remaining, "HILD_ERROR_NATIVE")) {
e5218da5
GA
766 sv_setiv(sv, (IV)STATUS_NATIVE);
767 }
49460fe6
NIS
768 break;
769
79072805 770 case '\004': /* ^D */
aea4f609 771 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
79072805 772 break;
28f23441 773 case '\005': /* ^E */
823a54a3 774 if (nextchar == '\0') {
e37778c2 775#if defined(VMS)
0a378802
JH
776 {
777# include <descrip.h>
778# include <starlet.h>
779 char msg[255];
780 $DESCRIPTOR(msgdsc,msg);
781 sv_setnv(sv,(NV) vaxc$errno);
782 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
783 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
784 else
76f68e9b 785 sv_setpvs(sv,"");
0a378802 786 }
4b645107 787#elif defined(OS2)
0a378802
JH
788 if (!(_emx_env & 0x200)) { /* Under DOS */
789 sv_setnv(sv, (NV)errno);
790 sv_setpv(sv, errno ? Strerror(errno) : "");
791 } else {
792 if (errno != errno_isOS2) {
823a54a3 793 const int tmp = _syserrno();
0a378802
JH
794 if (tmp) /* 2nd call to _syserrno() makes it 0 */
795 Perl_rc = tmp;
796 }
797 sv_setnv(sv, (NV)Perl_rc);
798 sv_setpv(sv, os2error(Perl_rc));
799 }
4b645107 800#elif defined(WIN32)
0a378802 801 {
d4c19fe8 802 const DWORD dwErr = GetLastError();
0a378802 803 sv_setnv(sv, (NV)dwErr);
823a54a3 804 if (dwErr) {
0a378802
JH
805 PerlProc_GetOSError(sv, dwErr);
806 }
807 else
76f68e9b 808 sv_setpvs(sv, "");
0a378802
JH
809 SetLastError(dwErr);
810 }
22fae026 811#else
f6c8f21d 812 {
4ee39169 813 dSAVE_ERRNO;
f6c8f21d 814 sv_setnv(sv, (NV)errno);
666ea192 815 sv_setpv(sv, errno ? Strerror(errno) : "");
4ee39169 816 RESTORE_ERRNO;
f6c8f21d 817 }
28f23441 818#endif
ad3296c6 819 SvRTRIM(sv);
0a378802
JH
820 SvNOK_on(sv); /* what a wonderful hack! */
821 }
823a54a3 822 else if (strEQ(remaining, "NCODING"))
0a378802
JH
823 sv_setsv(sv, PL_encoding);
824 break;
79072805 825 case '\006': /* ^F */
3280af22 826 sv_setiv(sv, (IV)PL_maxsysfd);
79072805 827 break;
a0d0e21e 828 case '\010': /* ^H */
3280af22 829 sv_setiv(sv, (IV)PL_hints);
a0d0e21e 830 break;
9d116dd7 831 case '\011': /* ^I */ /* NOT \t in EBCDIC */
120f7abe 832 sv_setpv(sv, PL_inplace); /* Will undefine sv if PL_inplace is NULL */
79072805 833 break;
ac27b0f5 834 case '\017': /* ^O & ^OPEN */
823a54a3 835 if (nextchar == '\0') {
ac27b0f5 836 sv_setpv(sv, PL_osname);
3511154c
DM
837 SvTAINTED_off(sv);
838 }
823a54a3 839 else if (strEQ(remaining, "PEN")) {
8b850bd5 840 Perl_emulate_cop_io(aTHX_ &PL_compiling, sv);
ac27b0f5 841 }
28f23441 842 break;
cde0cee5
YO
843 case '\020':
844 if (nextchar == '\0') { /* ^P */
845 sv_setiv(sv, (IV)PL_perldb);
846 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
847 goto do_prematch_fetch;
848 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
849 goto do_postmatch_fetch;
850 }
79072805 851 break;
fb73857a 852 case '\023': /* ^S */
823a54a3 853 if (nextchar == '\0') {
bc177e6b 854 if (PL_parser && PL_parser->lex_state != LEX_NOTPARSING)
0c34ef67 855 SvOK_off(sv);
3280af22 856 else if (PL_in_eval)
6dc8a9e4 857 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
a4268c0a
AMS
858 else
859 sv_setiv(sv, 0);
d58bf5aa 860 }
fb73857a 861 break;
79072805 862 case '\024': /* ^T */
823a54a3 863 if (nextchar == '\0') {
88e89b8a 864#ifdef BIG_TIME
7c36658b 865 sv_setnv(sv, PL_basetime);
88e89b8a 866#else
7c36658b 867 sv_setiv(sv, (IV)PL_basetime);
88e89b8a 868#endif
7c36658b 869 }
823a54a3 870 else if (strEQ(remaining, "AINT"))
9aa05f58
RGS
871 sv_setiv(sv, PL_tainting
872 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
873 : 0);
7c36658b 874 break;
e07ea26a 875 case '\025': /* $^UNICODE, $^UTF8LOCALE, $^UTF8CACHE */
823a54a3 876 if (strEQ(remaining, "NICODE"))
a05d7ebb 877 sv_setuv(sv, (UV) PL_unicode);
823a54a3 878 else if (strEQ(remaining, "TF8LOCALE"))
7cebcbc0 879 sv_setuv(sv, (UV) PL_utf8locale);
e07ea26a
NC
880 else if (strEQ(remaining, "TF8CACHE"))
881 sv_setiv(sv, (IV) PL_utf8cache);
fde18df1
JH
882 break;
883 case '\027': /* ^W & $^WARNING_BITS */
823a54a3 884 if (nextchar == '\0')
4438c4b7 885 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
823a54a3 886 else if (strEQ(remaining, "ARNING_BITS")) {
013b78e8 887 if (PL_compiling.cop_warnings == pWARN_NONE) {
4438c4b7 888 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
013b78e8
RGS
889 }
890 else if (PL_compiling.cop_warnings == pWARN_STD) {
666ea192
JH
891 sv_setpvn(
892 sv,
893 (PL_dowarn & G_WARN_ON) ? WARN_ALLstring : WARN_NONEstring,
894 WARNsize
895 );
013b78e8 896 }
d3a7d8c7 897 else if (PL_compiling.cop_warnings == pWARN_ALL) {
75b6c4ca
RGS
898 /* Get the bit mask for $warnings::Bits{all}, because
899 * it could have been extended by warnings::register */
6673a63c 900 HV * const bits=get_hv("warnings::Bits", 0);
f5a63d97
AL
901 if (bits) {
902 SV ** const bits_all = hv_fetchs(bits, "all", FALSE);
903 if (bits_all)
904 sv_setsv(sv, *bits_all);
75b6c4ca
RGS
905 }
906 else {
907 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
908 }
ac27b0f5 909 }
4438c4b7 910 else {
72dc9ed5
NC
911 sv_setpvn(sv, (char *) (PL_compiling.cop_warnings + 1),
912 *PL_compiling.cop_warnings);
ac27b0f5 913 }
d3a7d8c7 914 SvPOK_only(sv);
4438c4b7 915 }
79072805 916 break;
cde0cee5
YO
917 case '\015': /* $^MATCH */
918 if (strEQ(remaining, "ATCH")) {
79072805
LW
919 case '1': case '2': case '3': case '4':
920 case '5': case '6': case '7': case '8': case '9': case '&':
cde0cee5
YO
921 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
922 /*
159b6efe 923 * Pre-threads, this was paren = atoi(GvENAME((const GV *)mg->mg_obj));
cde0cee5
YO
924 * XXX Does the new way break anything?
925 */
926 paren = atoi(mg->mg_ptr); /* $& is in [0] */
2fdbfb4d 927 CALLREG_NUMBUF_FETCH(rx,paren,sv);
cde0cee5
YO
928 break;
929 }
930 sv_setsv(sv,&PL_sv_undef);
79072805
LW
931 }
932 break;
933 case '+':
aaa362c4 934 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f
NC
935 if (RX_LASTPAREN(rx)) {
936 CALLREG_NUMBUF_FETCH(rx,RX_LASTPAREN(rx),sv);
44a2ac75
YO
937 break;
938 }
79072805 939 }
3280af22 940 sv_setsv(sv,&PL_sv_undef);
79072805 941 break;
a01268b5
JH
942 case '\016': /* ^N */
943 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
07bc277f
NC
944 if (RX_LASTCLOSEPAREN(rx)) {
945 CALLREG_NUMBUF_FETCH(rx,RX_LASTCLOSEPAREN(rx),sv);
44a2ac75
YO
946 break;
947 }
948
a01268b5
JH
949 }
950 sv_setsv(sv,&PL_sv_undef);
951 break;
79072805 952 case '`':
cde0cee5 953 do_prematch_fetch:
aaa362c4 954 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d 955 CALLREG_NUMBUF_FETCH(rx,-2,sv);
93b32b6d 956 break;
79072805 957 }
3280af22 958 sv_setsv(sv,&PL_sv_undef);
79072805
LW
959 break;
960 case '\'':
cde0cee5 961 do_postmatch_fetch:
aaa362c4 962 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d 963 CALLREG_NUMBUF_FETCH(rx,-1,sv);
93b32b6d 964 break;
79072805 965 }
3280af22 966 sv_setsv(sv,&PL_sv_undef);
79072805
LW
967 break;
968 case '.':
3280af22 969 if (GvIO(PL_last_in_gv)) {
357c8808 970 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
79072805 971 }
79072805
LW
972 break;
973 case '?':
809a5acc 974 {
809a5acc 975 sv_setiv(sv, (IV)STATUS_CURRENT);
ff0cee69 976#ifdef COMPLEX_STATUS
6b88bc9c
GS
977 LvTARGOFF(sv) = PL_statusvalue;
978 LvTARGLEN(sv) = PL_statusvalue_vms;
ff0cee69 979#endif
809a5acc 980 }
79072805
LW
981 break;
982 case '^':
0daa599b
RGS
983 if (GvIOp(PL_defoutgv))
984 s = IoTOP_NAME(GvIOp(PL_defoutgv));
79072805
LW
985 if (s)
986 sv_setpv(sv,s);
987 else {
3280af22 988 sv_setpv(sv,GvENAME(PL_defoutgv));
cb421d5e 989 sv_catpvs(sv,"_TOP");
79072805
LW
990 }
991 break;
992 case '~':
0daa599b
RGS
993 if (GvIOp(PL_defoutgv))
994 s = IoFMT_NAME(GvIOp(PL_defoutgv));
79072805 995 if (!s)
3280af22 996 s = GvENAME(PL_defoutgv);
79072805
LW
997 sv_setpv(sv,s);
998 break;
79072805 999 case '=':
0daa599b
RGS
1000 if (GvIOp(PL_defoutgv))
1001 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
79072805
LW
1002 break;
1003 case '-':
0daa599b
RGS
1004 if (GvIOp(PL_defoutgv))
1005 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
79072805
LW
1006 break;
1007 case '%':
0daa599b
RGS
1008 if (GvIOp(PL_defoutgv))
1009 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
79072805 1010 break;
79072805
LW
1011 case ':':
1012 break;
1013 case '/':
1014 break;
1015 case '[':
11206fdd 1016 sv_setiv(sv, (IV)CopARYBASE_get(PL_curcop));
79072805
LW
1017 break;
1018 case '|':
0daa599b
RGS
1019 if (GvIOp(PL_defoutgv))
1020 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
79072805 1021 break;
79072805 1022 case '\\':
b2ce0fda 1023 if (PL_ors_sv)
f28098ff 1024 sv_copypv(sv, PL_ors_sv);
79072805 1025 break;
79072805 1026 case '!':
a5f75d66 1027#ifdef VMS
65202027 1028 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
88e89b8a 1029 sv_setpv(sv, errno ? Strerror(errno) : "");
a5f75d66 1030#else
88e89b8a 1031 {
4ee39169 1032 dSAVE_ERRNO;
65202027 1033 sv_setnv(sv, (NV)errno);
88e89b8a 1034#ifdef OS2
ed344e4f
IZ
1035 if (errno == errno_isOS2 || errno == errno_isOS2_set)
1036 sv_setpv(sv, os2error(Perl_rc));
88e89b8a 1037 else
a5f75d66 1038#endif
666ea192 1039 sv_setpv(sv, errno ? Strerror(errno) : "");
4ee39169 1040 RESTORE_ERRNO;
88e89b8a
PP
1041 }
1042#endif
ad3296c6 1043 SvRTRIM(sv);
946ec16e 1044 SvNOK_on(sv); /* what a wonderful hack! */
79072805
LW
1045 break;
1046 case '<':
3280af22 1047 sv_setiv(sv, (IV)PL_uid);
79072805
LW
1048 break;
1049 case '>':
3280af22 1050 sv_setiv(sv, (IV)PL_euid);
79072805
LW
1051 break;
1052 case '(':
3280af22 1053 sv_setiv(sv, (IV)PL_gid);
79072805
LW
1054 goto add_groups;
1055 case ')':
3280af22 1056 sv_setiv(sv, (IV)PL_egid);
79072805 1057 add_groups:
79072805 1058#ifdef HAS_GETGROUPS
79072805 1059 {
57d7c65e 1060 Groups_t *gary = NULL;
fb45abb2 1061 I32 i, num_groups = getgroups(0, gary);
57d7c65e
JC
1062 Newx(gary, num_groups, Groups_t);
1063 num_groups = getgroups(num_groups, gary);
fb45abb2
GA
1064 for (i = 0; i < num_groups; i++)
1065 Perl_sv_catpvf(aTHX_ sv, " %"IVdf, (IV)gary[i]);
57d7c65e 1066 Safefree(gary);
79072805 1067 }
155aba94 1068 (void)SvIOK_on(sv); /* what a wonderful hack! */
cd70abae 1069#endif
79072805 1070 break;
79072805
LW
1071 case '0':
1072 break;
1073 }
a0d0e21e 1074 return 0;
79072805
LW
1075}
1076
1077int
864dbfa3 1078Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 1079{
8772537c 1080 struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 1081
7918f24d
NC
1082 PERL_ARGS_ASSERT_MAGIC_GETUVAR;
1083
79072805 1084 if (uf && uf->uf_val)
24f81a43 1085 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
79072805
LW
1086 return 0;
1087}
1088
1089int
864dbfa3 1090Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
79072805 1091{
27da23d5 1092 dVAR;
9ae3433d 1093 STRLEN len = 0, klen;
666ea192 1094 const char *s = SvOK(sv) ? SvPV_const(sv,len) : "";
fabdb6c0 1095 const char * const ptr = MgPV_const(mg,klen);
88e89b8a 1096 my_setenv(ptr, s);
1e422769 1097
7918f24d
NC
1098 PERL_ARGS_ASSERT_MAGIC_SETENV;
1099
a0d0e21e
LW
1100#ifdef DYNAMIC_ENV_FETCH
1101 /* We just undefd an environment var. Is a replacement */
1102 /* waiting in the wings? */
1103 if (!len) {
fabdb6c0
AL
1104 SV ** const valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE);
1105 if (valp)
4ab59fcc 1106 s = SvOK(*valp) ? SvPV_const(*valp, len) : "";
a0d0e21e
LW
1107 }
1108#endif
1e422769 1109
39e571d4 1110#if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
79072805
LW
1111 /* And you'll never guess what the dog had */
1112 /* in its mouth... */
3280af22 1113 if (PL_tainting) {
1e422769
PP
1114 MgTAINTEDDIR_off(mg);
1115#ifdef VMS
5aabfad6 1116 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
b8ffc8df 1117 char pathbuf[256], eltbuf[256], *cp, *elt;
c623ac67 1118 Stat_t sbuf;
1e422769
PP
1119 int i = 0, j = 0;
1120
6fca0082 1121 my_strlcpy(eltbuf, s, sizeof(eltbuf));
b8ffc8df 1122 elt = eltbuf;
1e422769
PP
1123 do { /* DCL$PATH may be a search list */
1124 while (1) { /* as may dev portion of any element */
1125 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
1126 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
1127 cando_by_name(S_IWUSR,0,elt) ) {
1128 MgTAINTEDDIR_on(mg);
1129 return 0;
1130 }
1131 }
bd61b366 1132 if ((cp = strchr(elt, ':')) != NULL)
1e422769
PP
1133 *cp = '\0';
1134 if (my_trnlnm(elt, eltbuf, j++))
1135 elt = eltbuf;
1136 else
1137 break;
1138 }
1139 j = 0;
1140 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1141 }
1142#endif /* VMS */
5aabfad6 1143 if (s && klen == 4 && strEQ(ptr,"PATH")) {
8772537c 1144 const char * const strend = s + len;
463ee0b2
LW
1145
1146 while (s < strend) {
96827780 1147 char tmpbuf[256];
c623ac67 1148 Stat_t st;
5f74f29c 1149 I32 i;
f5a63d97
AL
1150#ifdef VMS /* Hmm. How do we get $Config{path_sep} from C? */
1151 const char path_sep = '|';
1152#else
1153 const char path_sep = ':';
1154#endif
96827780 1155 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
427eaa01 1156 s, strend, path_sep, &i);
463ee0b2 1157 s++;
bb7a0f54 1158 if (i >= (I32)sizeof tmpbuf /* too long -- assume the worst */
326b5008
CB
1159#ifdef VMS
1160 || !strchr(tmpbuf, ':') /* no colon thus no device name -- assume relative path */
1161#else
1162 || *tmpbuf != '/' /* no starting slash -- assume relative path */
1163#endif
c6ed36e1 1164 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
8990e307 1165 MgTAINTEDDIR_on(mg);
1e422769
PP
1166 return 0;
1167 }
463ee0b2 1168 }
79072805
LW
1169 }
1170 }
39e571d4 1171#endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1e422769 1172
79072805
LW
1173 return 0;
1174}
1175
1176int
864dbfa3 1177Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
85e6fe83 1178{
7918f24d 1179 PERL_ARGS_ASSERT_MAGIC_CLEARENV;
8772537c 1180 PERL_UNUSED_ARG(sv);
bd61b366 1181 my_setenv(MgPV_nolen_const(mg),NULL);
85e6fe83
LW
1182 return 0;
1183}
1184
88e89b8a 1185int
864dbfa3 1186Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
fb73857a 1187{
97aff369 1188 dVAR;
7918f24d 1189 PERL_ARGS_ASSERT_MAGIC_SET_ALL_ENV;
65e66c80 1190 PERL_UNUSED_ARG(mg);
b0269e46 1191#if defined(VMS)
cea2e8a9 1192 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
fb73857a 1193#else
3280af22 1194 if (PL_localizing) {
fb73857a 1195 HE* entry;
b0269e46 1196 my_clearenv();
85fbaab2
NC
1197 hv_iterinit(MUTABLE_HV(sv));
1198 while ((entry = hv_iternext(MUTABLE_HV(sv)))) {
fb73857a
PP
1199 I32 keylen;
1200 my_setenv(hv_iterkey(entry, &keylen),
85fbaab2 1201 SvPV_nolen_const(hv_iterval(MUTABLE_HV(sv), entry)));
fb73857a
PP
1202 }
1203 }
1204#endif
1205 return 0;
1206}
1207
1208int
864dbfa3 1209Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
66b1d557 1210{
27da23d5 1211 dVAR;
7918f24d 1212 PERL_ARGS_ASSERT_MAGIC_CLEAR_ALL_ENV;
8772537c
AL
1213 PERL_UNUSED_ARG(sv);
1214 PERL_UNUSED_ARG(mg);
b0269e46
AB
1215#if defined(VMS)
1216 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1217#else
1218 my_clearenv();
1219#endif
3e3baf6d 1220 return 0;
66b1d557
HM
1221}
1222
64ca3a65 1223#ifndef PERL_MICRO
2d4fcd5e
AJ
1224#ifdef HAS_SIGPROCMASK
1225static void
1226restore_sigmask(pTHX_ SV *save_sv)
1227{
0bd48802 1228 const sigset_t * const ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
f5a63d97 1229 (void)sigprocmask(SIG_SETMASK, ossetp, NULL);
2d4fcd5e
AJ
1230}
1231#endif
66b1d557 1232int
864dbfa3 1233Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1234{
97aff369 1235 dVAR;
88e89b8a 1236 /* Are we fetching a signal entry? */
8772537c 1237 const I32 i = whichsig(MgPV_nolen_const(mg));
7918f24d
NC
1238
1239 PERL_ARGS_ASSERT_MAGIC_GETSIG;
1240
e02bfb16 1241 if (i > 0) {
22c35a8c
GS
1242 if(PL_psig_ptr[i])
1243 sv_setsv(sv,PL_psig_ptr[i]);
88e89b8a 1244 else {
46da273f 1245 Sighandler_t sigstate = rsignal_state(i);
23ada85b 1246#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
46da273f
AL
1247 if (PL_sig_handlers_initted && PL_sig_ignoring[i])
1248 sigstate = SIG_IGN;
2e34cc90
CL
1249#endif
1250#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
46da273f
AL
1251 if (PL_sig_handlers_initted && PL_sig_defaulting[i])
1252 sigstate = SIG_DFL;
85b332e2 1253#endif
88e89b8a 1254 /* cache state so we don't fetch it again */
8aad04aa 1255 if(sigstate == (Sighandler_t) SIG_IGN)
6502358f 1256 sv_setpvs(sv,"IGNORE");
88e89b8a 1257 else
3280af22 1258 sv_setsv(sv,&PL_sv_undef);
46da273f 1259 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
88e89b8a
PP
1260 SvTEMP_off(sv);
1261 }
1262 }
1263 return 0;
1264}
1265int
864dbfa3 1266Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
88e89b8a 1267{
7918f24d 1268 PERL_ARGS_ASSERT_MAGIC_CLEARSIG;
8772537c 1269 PERL_UNUSED_ARG(sv);
179c85a2 1270
38a124f0 1271 magic_setsig(NULL, mg);
179c85a2 1272 return sv_unmagic(sv, mg->mg_type);
88e89b8a 1273}
3d37d572 1274
0a8e0eff 1275Signal_t
8aad04aa 1276#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 1277Perl_csighandler(int sig, siginfo_t *sip PERL_UNUSED_DECL, void *uap PERL_UNUSED_DECL)
8aad04aa 1278#else
0a8e0eff 1279Perl_csighandler(int sig)
8aad04aa 1280#endif
0a8e0eff 1281{
1018e26f
NIS
1282#ifdef PERL_GET_SIG_CONTEXT
1283 dTHXa(PERL_GET_SIG_CONTEXT);
1284#else
85b332e2
CL
1285 dTHX;
1286#endif
23ada85b 1287#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
5c1546dc 1288 (void) rsignal(sig, PL_csighandlerp);
27da23d5 1289 if (PL_sig_ignoring[sig]) return;
85b332e2 1290#endif
2e34cc90 1291#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1292 if (PL_sig_defaulting[sig])
2e34cc90
CL
1293#ifdef KILL_BY_SIGPRC
1294 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1295#else
1296 exit(1);
1297#endif
1298#endif
406878dd 1299 if (
853d2c32
RGS
1300#ifdef SIGILL
1301 sig == SIGILL ||
1302#endif
1303#ifdef SIGBUS
1304 sig == SIGBUS ||
1305#endif
1306#ifdef SIGSEGV
1307 sig == SIGSEGV ||
1308#endif
1309 (PL_signals & PERL_SIGNALS_UNSAFE_FLAG))
4ffa73a3
JH
1310 /* Call the perl level handler now--
1311 * with risk we may be in malloc() etc. */
6e324d09 1312#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1313 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1314#else
1315 (*PL_sighandlerp)(sig);
92807b6d 1316#endif
406878dd
GA
1317 else {
1318 /* Set a flag to say this signal is pending, that is awaiting delivery after
1319 * the current Perl opcode completes */
1320 PL_psig_pend[sig]++;
1321
1322#ifndef SIG_PENDING_DIE_COUNT
1323# define SIG_PENDING_DIE_COUNT 120
1324#endif
1325 /* And one to say _a_ signal is pending */
1326 if (++PL_sig_pending >= SIG_PENDING_DIE_COUNT)
1327 Perl_croak(aTHX_ "Maximal count of pending signals (%lu) exceeded",
1328 (unsigned long)SIG_PENDING_DIE_COUNT);
1329 }
0a8e0eff
NIS
1330}
1331
2e34cc90
CL
1332#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1333void
1334Perl_csighandler_init(void)
1335{
1336 int sig;
27da23d5 1337 if (PL_sig_handlers_initted) return;
2e34cc90
CL
1338
1339 for (sig = 1; sig < SIG_SIZE; sig++) {
1340#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
218fdd94 1341 dTHX;
27da23d5 1342 PL_sig_defaulting[sig] = 1;
5c1546dc 1343 (void) rsignal(sig, PL_csighandlerp);
2e34cc90
CL
1344#endif
1345#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1346 PL_sig_ignoring[sig] = 0;
2e34cc90
CL
1347#endif
1348 }
27da23d5 1349 PL_sig_handlers_initted = 1;
2e34cc90
CL
1350}
1351#endif
1352
0a8e0eff
NIS
1353void
1354Perl_despatch_signals(pTHX)
1355{
97aff369 1356 dVAR;
0a8e0eff
NIS
1357 int sig;
1358 PL_sig_pending = 0;
1359 for (sig = 1; sig < SIG_SIZE; sig++) {
1360 if (PL_psig_pend[sig]) {
25da4428
JH
1361 PERL_BLOCKSIG_ADD(set, sig);
1362 PL_psig_pend[sig] = 0;
1363 PERL_BLOCKSIG_BLOCK(set);
6e324d09 1364#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
80626cf1 1365 (*PL_sighandlerp)(sig, NULL, NULL);
6e324d09
CB
1366#else
1367 (*PL_sighandlerp)(sig);
92807b6d 1368#endif
25da4428 1369 PERL_BLOCKSIG_UNBLOCK(set);
0a8e0eff
NIS
1370 }
1371 }
1372}
1373
38a124f0 1374/* sv of NULL signifies that we're acting as magic_clearsig. */
85e6fe83 1375int
864dbfa3 1376Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
79072805 1377{
27da23d5 1378 dVAR;
79072805 1379 I32 i;
cbbf8932 1380 SV** svp = NULL;
2d4fcd5e
AJ
1381 /* Need to be careful with SvREFCNT_dec(), because that can have side
1382 * effects (due to closures). We must make sure that the new disposition
1383 * is in place before it is called.
1384 */
cbbf8932 1385 SV* to_dec = NULL;
e72dc28c 1386 STRLEN len;
2d4fcd5e
AJ
1387#ifdef HAS_SIGPROCMASK
1388 sigset_t set, save;
1389 SV* save_sv;
1390#endif
d5263905 1391 register const char *s = MgPV_const(mg,len);
7918f24d
NC
1392
1393 PERL_ARGS_ASSERT_MAGIC_SETSIG;
1394
748a9306
LW
1395 if (*s == '_') {
1396 if (strEQ(s,"__DIE__"))
3280af22 1397 svp = &PL_diehook;
38a124f0
NC
1398 else if (strEQ(s,"__WARN__")
1399 && (sv ? 1 : PL_warnhook != PERL_WARNHOOK_FATAL)) {
1400 /* Merge the existing behaviours, which are as follows:
1401 magic_setsig, we always set svp to &PL_warnhook
1402 (hence we always change the warnings handler)
1403 For magic_clearsig, we don't change the warnings handler if it's
1404 set to the &PL_warnhook. */
3280af22 1405 svp = &PL_warnhook;
38a124f0 1406 } else if (sv)
cea2e8a9 1407 Perl_croak(aTHX_ "No such hook: %s", s);
748a9306 1408 i = 0;
38a124f0 1409 if (svp && *svp) {
9289f461
RGS
1410 if (*svp != PERL_WARNHOOK_FATAL)
1411 to_dec = *svp;
cbbf8932 1412 *svp = NULL;
4633a7c4 1413 }
748a9306
LW
1414 }
1415 else {
1416 i = whichsig(s); /* ...no, a brick */
86d86cad 1417 if (i <= 0) {
38a124f0 1418 if (sv && ckWARN(WARN_SIGNAL))
9014280d 1419 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
748a9306
LW
1420 return 0;
1421 }
2d4fcd5e
AJ
1422#ifdef HAS_SIGPROCMASK
1423 /* Avoid having the signal arrive at a bad time, if possible. */
1424 sigemptyset(&set);
1425 sigaddset(&set,i);
1426 sigprocmask(SIG_BLOCK, &set, &save);
1427 ENTER;
9ff8e806 1428 save_sv = newSVpvn((char *)(&save), sizeof(sigset_t));
2d4fcd5e
AJ
1429 SAVEFREESV(save_sv);
1430 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1431#endif
1432 PERL_ASYNC_CHECK();
2e34cc90 1433#if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
27da23d5 1434 if (!PL_sig_handlers_initted) Perl_csighandler_init();
2e34cc90 1435#endif
23ada85b 1436#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1437 PL_sig_ignoring[i] = 0;
85b332e2 1438#endif
2e34cc90 1439#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1440 PL_sig_defaulting[i] = 0;
2e34cc90 1441#endif
22c35a8c 1442 SvREFCNT_dec(PL_psig_name[i]);
2d4fcd5e 1443 to_dec = PL_psig_ptr[i];
38a124f0
NC
1444 if (sv) {
1445 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1446 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1447 PL_psig_name[i] = newSVpvn(s, len);
1448 SvREADONLY_on(PL_psig_name[i]);
1449 } else {
1450 PL_psig_name[i] = NULL;
1451 PL_psig_ptr[i] = NULL;
1452 }
748a9306 1453 }
38a124f0 1454 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1455 if (i) {
5c1546dc 1456 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e
AJ
1457#ifdef HAS_SIGPROCMASK
1458 LEAVE;
1459#endif
1460 }
748a9306 1461 else
b37c2d43 1462 *svp = SvREFCNT_inc_simple_NN(sv);
2d4fcd5e
AJ
1463 if(to_dec)
1464 SvREFCNT_dec(to_dec);
a0d0e21e
LW
1465 return 0;
1466 }
38a124f0
NC
1467 if (sv && SvOK(sv)) {
1468 s = SvPV_force(sv, len);
1469 } else {
1470 sv = NULL;
1471 }
1472 if (sv && strEQ(s,"IGNORE")) {
85b332e2 1473 if (i) {
23ada85b 1474#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
27da23d5 1475 PL_sig_ignoring[i] = 1;
5c1546dc 1476 (void)rsignal(i, PL_csighandlerp);
85b332e2 1477#else
8aad04aa 1478 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1479#endif
2d4fcd5e 1480 }
748a9306 1481 }
38a124f0 1482 else if (!sv || strEQ(s,"DEFAULT") || !len) {
136e0459 1483 if (i) {
2e34cc90 1484#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
27da23d5 1485 PL_sig_defaulting[i] = 1;
5c1546dc 1486 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1487#else
8aad04aa 1488 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1489#endif
136e0459 1490 }
748a9306 1491 }
79072805 1492 else {
5aabfad6
PP
1493 /*
1494 * We should warn if HINT_STRICT_REFS, but without
1495 * access to a known hint bit in a known OP, we can't
1496 * tell whether HINT_STRICT_REFS is in force or not.
1497 */
46fc3d4c 1498 if (!strchr(s,':') && !strchr(s,'\''))
84335ee9
NC
1499 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1500 SV_GMAGIC);
748a9306 1501 if (i)
5c1546dc 1502 (void)rsignal(i, PL_csighandlerp);
748a9306 1503 else
46da273f 1504 *svp = SvREFCNT_inc_simple_NN(sv);
79072805 1505 }
2d4fcd5e
AJ
1506#ifdef HAS_SIGPROCMASK
1507 if(i)
1508 LEAVE;
1509#endif
1510 if(to_dec)
1511 SvREFCNT_dec(to_dec);
79072805
LW
1512 return 0;
1513}
64ca3a65 1514#endif /* !PERL_MICRO */
79072805
LW
1515
1516int
864dbfa3 1517Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1518{
97aff369 1519 dVAR;
08aeb9f7 1520 HV* stash;
7918f24d
NC
1521
1522 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1523 PERL_UNUSED_ARG(sv);
e1a479c5 1524
08aeb9f7
BB
1525 /* Bail out if destruction is going on */
1526 if(PL_dirty) return 0;
1527
89c14e2e
BB
1528 /* Skip _isaelem because _isa will handle it shortly */
1529 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1530 return 0;
1531
70cd14a1
CB
1532 /* XXX Once it's possible, we need to
1533 detect that our @ISA is aliased in
1534 other stashes, and act on the stashes
1535 of all of the aliases */
1536
e1a479c5
BB
1537 /* The first case occurs via setisa,
1538 the second via setisa_elem, which
1539 calls this same magic */
08aeb9f7
BB
1540 stash = GvSTASH(
1541 SvTYPE(mg->mg_obj) == SVt_PVGV
159b6efe
NC
1542 ? (const GV *)mg->mg_obj
1543 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
e1a479c5
BB
1544 );
1545
5562fa71
RGS
1546 if (stash)
1547 mro_isa_changed_in(stash);
08aeb9f7 1548
463ee0b2
LW
1549 return 0;
1550}
1551
1552int
52b45067
RD
1553Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1554{
1555 dVAR;
1556 HV* stash;
1557
7918f24d
NC
1558 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1559
52b45067
RD
1560 /* Bail out if destruction is going on */
1561 if(PL_dirty) return 0;
1562
502c6561 1563 av_clear(MUTABLE_AV(sv));
52b45067
RD
1564
1565 /* XXX see comments in magic_setisa */
1566 stash = GvSTASH(
1567 SvTYPE(mg->mg_obj) == SVt_PVGV
159b6efe
NC
1568 ? (const GV *)mg->mg_obj
1569 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
52b45067
RD
1570 );
1571
5562fa71
RGS
1572 if (stash)
1573 mro_isa_changed_in(stash);
52b45067
RD
1574
1575 return 0;
1576}
1577
1578int
864dbfa3 1579Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1580{
97aff369 1581 dVAR;
7918f24d 1582 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
8772537c
AL
1583 PERL_UNUSED_ARG(sv);
1584 PERL_UNUSED_ARG(mg);
3280af22 1585 PL_amagic_generation++;
463ee0b2 1586
a0d0e21e
LW
1587 return 0;
1588}
463ee0b2 1589
946ec16e 1590int
864dbfa3 1591Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1592{
85fbaab2 1593 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1594 I32 i = 0;
7918f24d
NC
1595
1596 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1597 PERL_UNUSED_ARG(mg);
7719e241 1598
6ff81951 1599 if (hv) {
497b47a8 1600 (void) hv_iterinit(hv);
ad64d0ec 1601 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
497b47a8
JH
1602 i = HvKEYS(hv);
1603 else {
1604 while (hv_iternext(hv))
1605 i++;
1606 }
6ff81951
GS
1607 }
1608
1609 sv_setiv(sv, (IV)i);
1610 return 0;
1611}
1612
1613int
864dbfa3 1614Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1615{
7918f24d 1616 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1617 PERL_UNUSED_ARG(mg);
946ec16e 1618 if (LvTARG(sv)) {
85fbaab2 1619 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1620 }
1621 return 0;
ac27b0f5 1622}
946ec16e 1623
e336de0d 1624/* caller is responsible for stack switching/cleanup */
565764a8 1625STATIC int
e1ec3a88 1626S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
a0d0e21e 1627{
97aff369 1628 dVAR;
a0d0e21e 1629 dSP;
463ee0b2 1630
7918f24d
NC
1631 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1632
924508f0
GS
1633 PUSHMARK(SP);
1634 EXTEND(SP, n);
33c27489 1635 PUSHs(SvTIED_obj(sv, mg));
ac27b0f5 1636 if (n > 1) {
93965878 1637 if (mg->mg_ptr) {
565764a8 1638 if (mg->mg_len >= 0)
6e449a3a 1639 mPUSHp(mg->mg_ptr, mg->mg_len);
565764a8 1640 else if (mg->mg_len == HEf_SVKEY)
ad64d0ec 1641 PUSHs(MUTABLE_SV(mg->mg_ptr));
93965878 1642 }
14befaf4 1643 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
6e449a3a 1644 mPUSHi(mg->mg_len);
93965878
NIS
1645 }
1646 }
1647 if (n > 2) {
1648 PUSHs(val);
88e89b8a 1649 }
463ee0b2
LW
1650 PUTBACK;
1651
864dbfa3 1652 return call_method(meth, flags);
946ec16e
PP
1653}
1654
76e3520e 1655STATIC int
e1ec3a88 1656S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
a0d0e21e 1657{
27da23d5 1658 dVAR; dSP;
463ee0b2 1659
7918f24d
NC
1660 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1661
a0d0e21e
LW
1662 ENTER;
1663 SAVETMPS;
e788e7d3 1664 PUSHSTACKi(PERLSI_MAGIC);
463ee0b2 1665
33c27489 1666 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
3280af22 1667 sv_setsv(sv, *PL_stack_sp--);
93965878 1668 }
463ee0b2 1669
d3acc0f7 1670 POPSTACK;
a0d0e21e
LW
1671 FREETMPS;
1672 LEAVE;
1673 return 0;
1674}
463ee0b2 1675
a0d0e21e 1676int
864dbfa3 1677Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1678{
7918f24d
NC
1679 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1680
a0d0e21e
LW
1681 if (mg->mg_ptr)
1682 mg->mg_flags |= MGf_GSKIP;
58f82c5c 1683 magic_methpack(sv,mg,"FETCH");
463ee0b2
LW
1684 return 0;
1685}
1686
1687int
864dbfa3 1688Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1689{
27da23d5 1690 dVAR; dSP;
7918f24d
NC
1691
1692 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1693
a60c0954 1694 ENTER;
e788e7d3 1695 PUSHSTACKi(PERLSI_MAGIC);
33c27489 1696 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
d3acc0f7 1697 POPSTACK;
a60c0954 1698 LEAVE;
463ee0b2
LW
1699 return 0;
1700}
1701
1702int
864dbfa3 1703Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1704{
7918f24d
NC
1705 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1706
a0d0e21e
LW
1707 return magic_methpack(sv,mg,"DELETE");
1708}
463ee0b2 1709
93965878
NIS
1710
1711U32
864dbfa3 1712Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1713{
27da23d5 1714 dVAR; dSP;
22846ab4 1715 I32 retval = 0;
93965878 1716
7918f24d
NC
1717 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1718
93965878
NIS
1719 ENTER;
1720 SAVETMPS;
e788e7d3 1721 PUSHSTACKi(PERLSI_MAGIC);
33c27489 1722 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
3280af22 1723 sv = *PL_stack_sp--;
22846ab4
AB
1724 retval = SvIV(sv)-1;
1725 if (retval < -1)
1726 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1727 }
d3acc0f7 1728 POPSTACK;
93965878
NIS
1729 FREETMPS;
1730 LEAVE;
22846ab4 1731 return (U32) retval;
93965878
NIS
1732}
1733
cea2e8a9
GS
1734int
1735Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1736{
27da23d5 1737 dVAR; dSP;
463ee0b2 1738
7918f24d
NC
1739 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1740
e336de0d 1741 ENTER;
e788e7d3 1742 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1743 PUSHMARK(SP);
33c27489 1744 XPUSHs(SvTIED_obj(sv, mg));
463ee0b2 1745 PUTBACK;
864dbfa3 1746 call_method("CLEAR", G_SCALAR|G_DISCARD);
d3acc0f7 1747 POPSTACK;
a60c0954 1748 LEAVE;
a3bcc51e 1749
463ee0b2
LW
1750 return 0;
1751}
1752
1753int
864dbfa3 1754Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1755{
27da23d5 1756 dVAR; dSP;
666ea192 1757 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
463ee0b2 1758
7918f24d
NC
1759 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1760
463ee0b2 1761 ENTER;
a0d0e21e 1762 SAVETMPS;
e788e7d3 1763 PUSHSTACKi(PERLSI_MAGIC);
924508f0
GS
1764 PUSHMARK(SP);
1765 EXTEND(SP, 2);
33c27489 1766 PUSHs(SvTIED_obj(sv, mg));
463ee0b2
LW
1767 if (SvOK(key))
1768 PUSHs(key);
1769 PUTBACK;
1770
864dbfa3 1771 if (call_method(meth, G_SCALAR))
3280af22 1772 sv_setsv(key, *PL_stack_sp--);
463ee0b2 1773
d3acc0f7 1774 POPSTACK;
a0d0e21e
LW
1775 FREETMPS;
1776 LEAVE;
79072805
LW
1777 return 0;
1778}
1779
1780int
1146e912 1781Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1782{
7918f24d
NC
1783 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1784
a0d0e21e 1785 return magic_methpack(sv,mg,"EXISTS");
ac27b0f5 1786}
a0d0e21e 1787
a3bcc51e
TP
1788SV *
1789Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1790{
27da23d5 1791 dVAR; dSP;
5fcbf73d 1792 SV *retval;
ad64d0ec
NC
1793 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1794 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1795
7918f24d
NC
1796 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1797
a3bcc51e
TP
1798 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1799 SV *key;
bfcb3514 1800 if (HvEITER_get(hv))
a3bcc51e
TP
1801 /* we are in an iteration so the hash cannot be empty */
1802 return &PL_sv_yes;
1803 /* no xhv_eiter so now use FIRSTKEY */
1804 key = sv_newmortal();
ad64d0ec 1805 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1806 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
1807 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1808 }
1809
1810 /* there is a SCALAR method that we can call */
1811 ENTER;
1812 PUSHSTACKi(PERLSI_MAGIC);
1813 PUSHMARK(SP);
1814 EXTEND(SP, 1);
1815 PUSHs(tied);
1816 PUTBACK;
1817
1818 if (call_method("SCALAR", G_SCALAR))
1819 retval = *PL_stack_sp--;
5fcbf73d
AL
1820 else
1821 retval = &PL_sv_undef;
a3bcc51e
TP
1822 POPSTACK;
1823 LEAVE;
1824 return retval;
1825}
1826
a0d0e21e 1827int
864dbfa3 1828Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1829{
97aff369 1830 dVAR;
8772537c
AL
1831 GV * const gv = PL_DBline;
1832 const I32 i = SvTRUE(sv);
1833 SV ** const svp = av_fetch(GvAV(gv),
01b8bcb7 1834 atoi(MgPV_nolen_const(mg)), FALSE);
7918f24d
NC
1835
1836 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1837
8772537c
AL
1838 if (svp && SvIOKp(*svp)) {
1839 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1840 if (o) {
1841 /* set or clear breakpoint in the relevant control op */
1842 if (i)
1843 o->op_flags |= OPf_SPECIAL;
1844 else
1845 o->op_flags &= ~OPf_SPECIAL;
1846 }
5df8de69 1847 }
79072805
LW
1848 return 0;
1849}
1850
1851int
8772537c 1852Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 1853{
97aff369 1854 dVAR;
502c6561 1855 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
1856
1857 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1858
83bf042f 1859 if (obj) {
fc15ae8f 1860 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
83bf042f
NC
1861 } else {
1862 SvOK_off(sv);
1863 }
79072805
LW
1864 return 0;
1865}
1866
1867int
864dbfa3 1868Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 1869{
97aff369 1870 dVAR;
502c6561 1871 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
1872
1873 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1874
83bf042f 1875 if (obj) {
fc15ae8f 1876 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
83bf042f
NC
1877 } else {
1878 if (ckWARN(WARN_MISC))
1879 Perl_warner(aTHX_ packWARN(WARN_MISC),
1880 "Attempt to set length of freed array");
1881 }
1882 return 0;
1883}
1884
1885int
1886Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1887{
97aff369 1888 dVAR;
7918f24d
NC
1889
1890 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 1891 PERL_UNUSED_ARG(sv);
7918f24d 1892
94f3782b
DM
1893 /* during global destruction, mg_obj may already have been freed */
1894 if (PL_in_clean_all)
1ea47f64 1895 return 0;
94f3782b 1896
83bf042f
NC
1897 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1898
1899 if (mg) {
1900 /* arylen scalar holds a pointer back to the array, but doesn't own a
1901 reference. Hence the we (the array) are about to go away with it
1902 still pointing at us. Clear its pointer, else it would be pointing
1903 at free memory. See the comment in sv_magic about reference loops,
1904 and why it can't own a reference to us. */
1905 mg->mg_obj = 0;
1906 }
a0d0e21e
LW
1907 return 0;
1908}
1909
1910int
864dbfa3 1911Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1912{
97aff369 1913 dVAR;
8772537c 1914 SV* const lsv = LvTARG(sv);
7918f24d
NC
1915
1916 PERL_ARGS_ASSERT_MAGIC_GETPOS;
3881461a 1917 PERL_UNUSED_ARG(mg);
ac27b0f5 1918
a0d0e21e 1919 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
3881461a
AL
1920 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1921 if (found && found->mg_len >= 0) {
1922 I32 i = found->mg_len;
7e2040f0 1923 if (DO_UTF8(lsv))
a0ed51b3 1924 sv_pos_b2u(lsv, &i);
fc15ae8f 1925 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
a0d0e21e
LW
1926 return 0;
1927 }
1928 }
0c34ef67 1929 SvOK_off(sv);
a0d0e21e
LW
1930 return 0;
1931}
1932
1933int
864dbfa3 1934Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1935{
97aff369 1936 dVAR;
8772537c 1937 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
1938 SSize_t pos;
1939 STRLEN len;
c00206c8 1940 STRLEN ulen = 0;
53d44271 1941 MAGIC* found;
a0d0e21e 1942
7918f24d 1943 PERL_ARGS_ASSERT_MAGIC_SETPOS;
3881461a 1944 PERL_UNUSED_ARG(mg);
ac27b0f5 1945
a0d0e21e 1946 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
3881461a
AL
1947 found = mg_find(lsv, PERL_MAGIC_regex_global);
1948 else
1949 found = NULL;
1950 if (!found) {
a0d0e21e
LW
1951 if (!SvOK(sv))
1952 return 0;
d83f0a82
NC
1953#ifdef PERL_OLD_COPY_ON_WRITE
1954 if (SvIsCOW(lsv))
1955 sv_force_normal_flags(lsv, 0);
1956#endif
3881461a 1957 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
53d44271 1958 NULL, 0);
a0d0e21e
LW
1959 }
1960 else if (!SvOK(sv)) {
3881461a 1961 found->mg_len = -1;
a0d0e21e
LW
1962 return 0;
1963 }
1964 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1965
fc15ae8f 1966 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
a0ed51b3 1967
7e2040f0 1968 if (DO_UTF8(lsv)) {
a0ed51b3
LW
1969 ulen = sv_len_utf8(lsv);
1970 if (ulen)
1971 len = ulen;
a0ed51b3
LW
1972 }
1973
a0d0e21e
LW
1974 if (pos < 0) {
1975 pos += len;
1976 if (pos < 0)
1977 pos = 0;
1978 }
eb160463 1979 else if (pos > (SSize_t)len)
a0d0e21e 1980 pos = len;
a0ed51b3
LW
1981
1982 if (ulen) {
1983 I32 p = pos;
1984 sv_pos_u2b(lsv, &p, 0);
1985 pos = p;
1986 }
727405f8 1987
3881461a
AL
1988 found->mg_len = pos;
1989 found->mg_flags &= ~MGf_MINMATCH;
a0d0e21e 1990
79072805
LW
1991 return 0;
1992}
1993
1994int
864dbfa3 1995Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
1996{
1997 STRLEN len;
35a4481c 1998 SV * const lsv = LvTARG(sv);
b83604b4 1999 const char * const tmps = SvPV_const(lsv,len);
6ff81951
GS
2000 I32 offs = LvTARGOFF(sv);
2001 I32 rem = LvTARGLEN(sv);
7918f24d
NC
2002
2003 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2004 PERL_UNUSED_ARG(mg);
6ff81951 2005
9aa983d2
JH
2006 if (SvUTF8(lsv))
2007 sv_pos_u2b(lsv, &offs, &rem);
eb160463 2008 if (offs > (I32)len)
6ff81951 2009 offs = len;
eb160463 2010 if (rem + offs > (I32)len)
6ff81951
GS
2011 rem = len - offs;
2012 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
9aa983d2 2013 if (SvUTF8(lsv))
2ef4b674 2014 SvUTF8_on(sv);
6ff81951
GS
2015 return 0;
2016}
2017
2018int
864dbfa3 2019Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2020{
97aff369 2021 dVAR;
9aa983d2 2022 STRLEN len;
5fcbf73d 2023 const char * const tmps = SvPV_const(sv, len);
dd374669 2024 SV * const lsv = LvTARG(sv);
9aa983d2
JH
2025 I32 lvoff = LvTARGOFF(sv);
2026 I32 lvlen = LvTARGLEN(sv);
7918f24d
NC
2027
2028 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2029 PERL_UNUSED_ARG(mg);
075a4a2b 2030
1aa99e6b 2031 if (DO_UTF8(sv)) {
9aa983d2
JH
2032 sv_utf8_upgrade(lsv);
2033 sv_pos_u2b(lsv, &lvoff, &lvlen);
2034 sv_insert(lsv, lvoff, lvlen, tmps, len);
b76f3ce2 2035 LvTARGLEN(sv) = sv_len_utf8(sv);
9aa983d2
JH
2036 SvUTF8_on(lsv);
2037 }
9bf12eaf 2038 else if (lsv && SvUTF8(lsv)) {
5fcbf73d 2039 const char *utf8;
9aa983d2 2040 sv_pos_u2b(lsv, &lvoff, &lvlen);
b76f3ce2 2041 LvTARGLEN(sv) = len;
5fcbf73d
AL
2042 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2043 sv_insert(lsv, lvoff, lvlen, utf8, len);
2044 Safefree(utf8);
1aa99e6b 2045 }
b76f3ce2
GB
2046 else {
2047 sv_insert(lsv, lvoff, lvlen, tmps, len);
2048 LvTARGLEN(sv) = len;
2049 }
2050
1aa99e6b 2051
79072805
LW
2052 return 0;
2053}
2054
2055int
864dbfa3 2056Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2057{
97aff369 2058 dVAR;
7918f24d
NC
2059
2060 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2061 PERL_UNUSED_ARG(sv);
7918f24d 2062
27cc343c 2063 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW
2064 return 0;
2065}
2066
2067int
864dbfa3 2068Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2069{
97aff369 2070 dVAR;
7918f24d
NC
2071
2072 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2073 PERL_UNUSED_ARG(sv);
7918f24d 2074
b01e650a
DM
2075 /* update taint status */
2076 if (PL_tainted)
2077 mg->mg_len |= 1;
2078 else
2079 mg->mg_len &= ~1;
463ee0b2
LW
2080 return 0;
2081}
2082
2083int
864dbfa3 2084Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2085{
35a4481c 2086 SV * const lsv = LvTARG(sv);
7918f24d
NC
2087
2088 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2089 PERL_UNUSED_ARG(mg);
6ff81951 2090
6136c704
AL
2091 if (lsv)
2092 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2093 else
0c34ef67 2094 SvOK_off(sv);
6ff81951 2095
6ff81951
GS
2096 return 0;
2097}
2098
2099int
864dbfa3 2100Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2101{
7918f24d 2102 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2103 PERL_UNUSED_ARG(mg);
79072805
LW
2104 do_vecset(sv); /* XXX slurp this routine */
2105 return 0;
2106}
2107
2108int
864dbfa3 2109Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2110{
97aff369 2111 dVAR;
a0714e2c 2112 SV *targ = NULL;
7918f24d
NC
2113
2114 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2115
5f05dabc 2116 if (LvTARGLEN(sv)) {
68dc0745 2117 if (mg->mg_obj) {
8772537c 2118 SV * const ahv = LvTARG(sv);
85fbaab2 2119 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2120 if (he)
2121 targ = HeVAL(he);
68dc0745
PP
2122 }
2123 else {
502c6561 2124 AV *const av = MUTABLE_AV(LvTARG(sv));
68dc0745
PP
2125 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2126 targ = AvARRAY(av)[LvTARGOFF(sv)];
2127 }
46da273f 2128 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2129 /* somebody else defined it for us */
2130 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2131 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2132 LvTARGLEN(sv) = 0;
2133 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2134 mg->mg_obj = NULL;
68dc0745
PP
2135 mg->mg_flags &= ~MGf_REFCOUNTED;
2136 }
5f05dabc 2137 }
71be2cbc
PP
2138 else
2139 targ = LvTARG(sv);
3280af22 2140 sv_setsv(sv, targ ? targ : &PL_sv_undef);
71be2cbc
PP
2141 return 0;
2142}
2143
2144int
864dbfa3 2145Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2146{
7918f24d 2147 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2148 PERL_UNUSED_ARG(mg);
71be2cbc 2149 if (LvTARGLEN(sv))
68dc0745
PP
2150 vivify_defelem(sv);
2151 if (LvTARG(sv)) {
5f05dabc 2152 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2153 SvSETMAGIC(LvTARG(sv));
2154 }
5f05dabc
PP
2155 return 0;
2156}
2157
71be2cbc 2158void
864dbfa3 2159Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2160{
97aff369 2161 dVAR;
74e13ce4 2162 MAGIC *mg;
a0714e2c 2163 SV *value = NULL;
71be2cbc 2164
7918f24d
NC
2165 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2166
14befaf4 2167 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2168 return;
68dc0745 2169 if (mg->mg_obj) {
8772537c 2170 SV * const ahv = LvTARG(sv);
85fbaab2 2171 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2172 if (he)
2173 value = HeVAL(he);
3280af22 2174 if (!value || value == &PL_sv_undef)
be2597df 2175 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2176 }
68dc0745 2177 else {
502c6561 2178 AV *const av = MUTABLE_AV(LvTARG(sv));
5aabfad6 2179 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
a0714e2c 2180 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2181 else {
d4c19fe8 2182 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
3280af22 2183 if (!svp || (value = *svp) == &PL_sv_undef)
cea2e8a9 2184 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
68dc0745
PP
2185 }
2186 }
b37c2d43 2187 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2188 SvREFCNT_dec(LvTARG(sv));
2189 LvTARG(sv) = value;
71be2cbc 2190 LvTARGLEN(sv) = 0;
68dc0745 2191 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2192 mg->mg_obj = NULL;
68dc0745 2193 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2194}
2195
2196int
864dbfa3 2197Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2198{
7918f24d 2199 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
502c6561 2200 return Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
810b8aa5
GS
2201}
2202
2203int
864dbfa3 2204Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2205{
7918f24d 2206 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2207 PERL_UNUSED_CONTEXT;
565764a8 2208 mg->mg_len = -1;
c6496cc7 2209 SvSCREAM_off(sv);
93a17b20
LW
2210 return 0;
2211}
2212
2213int
864dbfa3 2214Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2215{
35a4481c 2216 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2217
7918f24d
NC
2218 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2219
79072805 2220 if (uf && uf->uf_set)
24f81a43 2221 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2222 return 0;
2223}
2224
c277df42 2225int
faf82a0b
AE
2226Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2227{
488344d2 2228 const char type = mg->mg_type;
7918f24d
NC
2229
2230 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2231
488344d2
NC
2232 if (type == PERL_MAGIC_qr) {
2233 } else if (type == PERL_MAGIC_bm) {
2234 SvTAIL_off(sv);
2235 SvVALID_off(sv);
2236 } else {
2237 assert(type == PERL_MAGIC_fm);
2238 SvCOMPILED_off(sv);
2239 }
2240 return sv_unmagic(sv, type);
faf82a0b
AE
2241}
2242
7a4c00b4 2243#ifdef USE_LOCALE_COLLATE
79072805 2244int
864dbfa3 2245Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2246{
7918f24d
NC
2247 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2248
bbce6d69 2249 /*
838b5b74 2250 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2251 * and vanished with a faint plop.
2252 */
96a5add6 2253 PERL_UNUSED_CONTEXT;
8772537c 2254 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2255 if (mg->mg_ptr) {
2256 Safefree(mg->mg_ptr);
2257 mg->mg_ptr = NULL;
565764a8 2258 mg->mg_len = -1;
7a4c00b4 2259 }
bbce6d69
PP
2260 return 0;
2261}
7a4c00b4 2262#endif /* USE_LOCALE_COLLATE */
bbce6d69 2263
7e8c5dac
HS
2264/* Just clear the UTF-8 cache data. */
2265int
2266Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2267{
7918f24d 2268 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2269 PERL_UNUSED_CONTEXT;
8772537c 2270 PERL_UNUSED_ARG(sv);
7e8c5dac 2271 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2272 mg->mg_ptr = NULL;
7e8c5dac
HS
2273 mg->mg_len = -1; /* The mg_len holds the len cache. */
2274 return 0;
2275}
2276
bbce6d69 2277int
864dbfa3 2278Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2279{
97aff369 2280 dVAR;
e1ec3a88 2281 register const char *s;
2fdbfb4d
AB
2282 register I32 paren;
2283 register const REGEXP * rx;
2284 const char * const remaining = mg->mg_ptr + 1;
79072805 2285 I32 i;
8990e307 2286 STRLEN len;
2fdbfb4d 2287
7918f24d
NC
2288 PERL_ARGS_ASSERT_MAGIC_SET;
2289
79072805 2290 switch (*mg->mg_ptr) {
2fdbfb4d
AB
2291 case '\015': /* $^MATCH */
2292 if (strEQ(remaining, "ATCH"))
2293 goto do_match;
2294 case '`': /* ${^PREMATCH} caught below */
2295 do_prematch:
f1b875a0 2296 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB
2297 goto setparen;
2298 case '\'': /* ${^POSTMATCH} caught below */
2299 do_postmatch:
f1b875a0 2300 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB
2301 goto setparen;
2302 case '&':
2303 do_match:
f1b875a0 2304 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d
AB
2305 goto setparen;
2306 case '1': case '2': case '3': case '4':
2307 case '5': case '6': case '7': case '8': case '9':
104a8018 2308 paren = atoi(mg->mg_ptr);
2fdbfb4d 2309 setparen:
1e05feb3 2310 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d
AB
2311 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2312 break;
1e05feb3 2313 } else {
2fdbfb4d
AB
2314 /* Croak with a READONLY error when a numbered match var is
2315 * set without a previous pattern match. Unless it's C<local $1>
2316 */
2317 if (!PL_localizing) {
f1f66076 2318 Perl_croak(aTHX_ "%s", PL_no_modify);
2fdbfb4d
AB
2319 }
2320 }
748a9306 2321 case '\001': /* ^A */
3280af22 2322 sv_setsv(PL_bodytarget, sv);
748a9306 2323 break;
49460fe6 2324 case '\003': /* ^C */
38ab35f8 2325 PL_minus_c = (bool)SvIV(sv);
49460fe6
NIS
2326 break;
2327
79072805 2328 case '\004': /* ^D */
b4ab917c 2329#ifdef DEBUGGING
b83604b4 2330 s = SvPV_nolen_const(sv);
ddcf8bc1 2331 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
79072805 2332 DEBUG_x(dump_all());
b4ab917c 2333#else
38ab35f8 2334 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2335#endif
79072805 2336 break;
28f23441 2337 case '\005': /* ^E */
d0063567 2338 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2339#ifdef VMS
38ab35f8 2340 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2341#else
2342# ifdef WIN32
d0063567 2343 SetLastError( SvIV(sv) );
e37778c2
NC
2344# else
2345# ifdef OS2
38ab35f8 2346 os2_setsyserrno(SvIV(sv));
e37778c2 2347# else
d0063567 2348 /* will anyone ever use this? */
38ab35f8 2349 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2350# endif
2351# endif
22fae026 2352#endif
d0063567
DK
2353 }
2354 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2355 if (PL_encoding)
2356 SvREFCNT_dec(PL_encoding);
2357 if (SvOK(sv) || SvGMAGICAL(sv)) {
2358 PL_encoding = newSVsv(sv);
2359 }
2360 else {
a0714e2c 2361 PL_encoding = NULL;
d0063567
DK
2362 }
2363 }
2364 break;
79072805 2365 case '\006': /* ^F */
38ab35f8 2366 PL_maxsysfd = SvIV(sv);
79072805 2367 break;
a0d0e21e 2368 case '\010': /* ^H */
38ab35f8 2369 PL_hints = SvIV(sv);
a0d0e21e 2370 break;
9d116dd7 2371 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2372 Safefree(PL_inplace);
bd61b366 2373 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2374 break;
28f23441 2375 case '\017': /* ^O */
ac27b0f5 2376 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2377 Safefree(PL_osname);
bd61b366 2378 PL_osname = NULL;
3511154c
DM
2379 if (SvOK(sv)) {
2380 TAINT_PROPER("assigning to $^O");
2e0de35c 2381 PL_osname = savesvpv(sv);
3511154c 2382 }
ac27b0f5
NIS
2383 }
2384 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2385 STRLEN len;
2386 const char *const start = SvPV(sv, len);
b54fc2b6 2387 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5
NC
2388 SV *tmp;
2389 struct refcounted_he *tmp_he;
2390
2391
2392 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2393 PL_hints
2394 |= HINT_LOCALIZE_HH | HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2395
2396 /* Opening for input is more common than opening for output, so
2397 ensure that hints for input are sooner on linked list. */
59cd0e26
NC
2398 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2399 SVs_TEMP | SvUTF8(sv))
76f68e9b 2400 : newSVpvs_flags("", SVs_TEMP | SvUTF8(sv));
8b850bd5
NC
2401
2402 tmp_he
2403 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
84bafc02
NC
2404 newSVpvs_flags("open>", SVs_TEMP),
2405 tmp);
8b850bd5
NC
2406
2407 /* The UTF-8 setting is carried over */
2408 sv_setpvn(tmp, start, out ? (STRLEN)(out - start) : len);
2409
11bcd5da 2410 PL_compiling.cop_hints_hash
8b850bd5 2411 = Perl_refcounted_he_new(aTHX_ tmp_he,
84bafc02
NC
2412 newSVpvs_flags("open<", SVs_TEMP),
2413 tmp);
ac27b0f5 2414 }
28f23441 2415 break;
79072805 2416 case '\020': /* ^P */
2fdbfb4d
AB
2417 if (*remaining == '\0') { /* ^P */
2418 PL_perldb = SvIV(sv);
2419 if (PL_perldb && !PL_DBsingle)
2420 init_debugger();
2421 break;
2422 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2423 goto do_prematch;
2424 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2425 goto do_postmatch;
2426 }
79072805 2427 case '\024': /* ^T */
88e89b8a 2428#ifdef BIG_TIME
6b88bc9c 2429 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2430#else
38ab35f8 2431 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2432#endif
79072805 2433 break;
e07ea26a
NC
2434 case '\025': /* ^UTF8CACHE */
2435 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2436 PL_utf8cache = (signed char) sv_2iv(sv);
2437 }
2438 break;
fde18df1 2439 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2440 if (*(mg->mg_ptr+1) == '\0') {
2441 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2442 i = SvIV(sv);
ac27b0f5 2443 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2444 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2445 }
599cee73 2446 }
0a378802 2447 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2448 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
d775746e
GS
2449 if (!SvPOK(sv) && PL_localizing) {
2450 sv_setpvn(sv, WARN_NONEstring, WARNsize);
d3a7d8c7 2451 PL_compiling.cop_warnings = pWARN_NONE;
d775746e
GS
2452 break;
2453 }
f4fc7782 2454 {
b5477537 2455 STRLEN len, i;
d3a7d8c7 2456 int accumulate = 0 ;
f4fc7782 2457 int any_fatals = 0 ;
b83604b4 2458 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2459 for (i = 0 ; i < len ; ++i) {
2460 accumulate |= ptr[i] ;
2461 any_fatals |= (ptr[i] & 0xAA) ;
2462 }
4243c432
NC
2463 if (!accumulate) {
2464 if (!specialWARN(PL_compiling.cop_warnings))
2465 PerlMemShared_free(PL_compiling.cop_warnings);
2466 PL_compiling.cop_warnings = pWARN_NONE;
2467 }
72dc9ed5
NC
2468 /* Yuck. I can't see how to abstract this: */
2469 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2470 WARN_ALL) && !any_fatals) {
4243c432
NC
2471 if (!specialWARN(PL_compiling.cop_warnings))
2472 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH
2473 PL_compiling.cop_warnings = pWARN_ALL;
2474 PL_dowarn |= G_WARN_ONCE ;
727405f8 2475 }
d3a7d8c7 2476 else {
72dc9ed5
NC
2477 STRLEN len;
2478 const char *const p = SvPV_const(sv, len);
2479
2480 PL_compiling.cop_warnings
8ee4cf24 2481 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2482 p, len);
2483
d3a7d8c7
GS
2484 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2485 PL_dowarn |= G_WARN_ONCE ;
2486 }
f4fc7782 2487
d3a7d8c7 2488 }
4438c4b7 2489 }
971a9dd3 2490 }
79072805
LW
2491 break;
2492 case '.':
3280af22
NIS
2493 if (PL_localizing) {
2494 if (PL_localizing == 1)
7766f137 2495 SAVESPTR(PL_last_in_gv);
748a9306 2496 }
3280af22 2497 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2498 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2499 break;
2500 case '^':
3280af22 2501 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
e1ec3a88 2502 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
f776e3cd 2503 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2504 break;
2505 case '~':
3280af22 2506 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
e1ec3a88 2507 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
f776e3cd 2508 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2509 break;
2510 case '=':
38ab35f8 2511 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2512 break;
2513 case '-':
38ab35f8 2514 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
3280af22
NIS
2515 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2516 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2517 break;
2518 case '%':
38ab35f8 2519 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2520 break;
2521 case '|':
4b65379b 2522 {
8772537c 2523 IO * const io = GvIOp(PL_defoutgv);
720f287d
AB
2524 if(!io)
2525 break;
38ab35f8 2526 if ((SvIV(sv)) == 0)
4b65379b
CS
2527 IoFLAGS(io) &= ~IOf_FLUSH;
2528 else {
2529 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2530 PerlIO *ofp = IoOFP(io);
2531 if (ofp)
2532 (void)PerlIO_flush(ofp);
2533 IoFLAGS(io) |= IOf_FLUSH;
2534 }
2535 }
79072805
LW
2536 }
2537 break;
79072805 2538 case '/':
3280af22 2539 SvREFCNT_dec(PL_rs);
8bfdd7d9 2540 PL_rs = newSVsv(sv);
79072805
LW
2541 break;
2542 case '\\':
7889fe52
NIS
2543 if (PL_ors_sv)
2544 SvREFCNT_dec(PL_ors_sv);
009c130f 2545 if (SvOK(sv) || SvGMAGICAL(sv)) {
7889fe52 2546 PL_ors_sv = newSVsv(sv);
009c130f 2547 }
e3c19b7b 2548 else {
a0714e2c 2549 PL_ors_sv = NULL;
e3c19b7b 2550 }
79072805 2551 break;
79072805 2552 case '[':
38ab35f8 2553 CopARYBASE_set(&PL_compiling, SvIV(sv));
79072805
LW
2554 break;
2555 case '?':
ff0cee69 2556#ifdef COMPLEX_STATUS
6b88bc9c
GS
2557 if (PL_localizing == 2) {
2558 PL_statusvalue = LvTARGOFF(sv);
2559 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2560 }
2561 else
2562#endif
2563#ifdef VMSISH_STATUS
2564 if (VMSISH_STATUS)
fb38d079 2565 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2566 else
2567#endif
38ab35f8 2568 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2569 break;
2570 case '!':
93189314
JH
2571 {
2572#ifdef VMS
2573# define PERL_VMS_BANG vaxc$errno
2574#else
2575# define PERL_VMS_BANG 0
2576#endif
91487cfc 2577 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314
JH
2578 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2579 }
79072805
LW
2580 break;
2581 case '<':
38ab35f8 2582 PL_uid = SvIV(sv);
3280af22
NIS
2583 if (PL_delaymagic) {
2584 PL_delaymagic |= DM_RUID;
79072805
LW
2585 break; /* don't do magic till later */
2586 }
2587#ifdef HAS_SETRUID
b28d0864 2588 (void)setruid((Uid_t)PL_uid);
79072805
LW
2589#else
2590#ifdef HAS_SETREUID
3280af22 2591 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
748a9306 2592#else
85e6fe83 2593#ifdef HAS_SETRESUID
b28d0864 2594 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2595#else
75870ed3 2596 if (PL_uid == PL_euid) { /* special case $< = $> */
2597#ifdef PERL_DARWIN
2598 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2599 if (PL_uid != 0 && PerlProc_getuid() == 0)
2600 (void)PerlProc_setuid(0);
2601#endif
b28d0864 2602 (void)PerlProc_setuid(PL_uid);
75870ed3 2603 } else {
d8eceb89 2604 PL_uid = PerlProc_getuid();
cea2e8a9 2605 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2606 }
79072805
LW
2607#endif
2608#endif
85e6fe83 2609#endif
d8eceb89 2610 PL_uid = PerlProc_getuid();
3280af22 2611 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2612 break;
2613 case '>':
38ab35f8 2614 PL_euid = SvIV(sv);
3280af22
NIS
2615 if (PL_delaymagic) {
2616 PL_delaymagic |= DM_EUID;
79072805
LW
2617 break; /* don't do magic till later */
2618 }
2619#ifdef HAS_SETEUID
3280af22 2620 (void)seteuid((Uid_t)PL_euid);
79072805
LW
2621#else
2622#ifdef HAS_SETREUID
b28d0864 2623 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
85e6fe83
LW
2624#else
2625#ifdef HAS_SETRESUID
6b88bc9c 2626 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
79072805 2627#else
b28d0864
NIS
2628 if (PL_euid == PL_uid) /* special case $> = $< */
2629 PerlProc_setuid(PL_euid);
a0d0e21e 2630 else {
e8ee3774 2631 PL_euid = PerlProc_geteuid();
cea2e8a9 2632 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2633 }
79072805
LW
2634#endif
2635#endif
85e6fe83 2636#endif
d8eceb89 2637 PL_euid = PerlProc_geteuid();
3280af22 2638 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2639 break;
2640 case '(':
38ab35f8 2641 PL_gid = SvIV(sv);
3280af22
NIS
2642 if (PL_delaymagic) {
2643 PL_delaymagic |= DM_RGID;
79072805
LW
2644 break; /* don't do magic till later */
2645 }
2646#ifdef HAS_SETRGID
b28d0864 2647 (void)setrgid((Gid_t)PL_gid);
79072805
LW
2648#else
2649#ifdef HAS_SETREGID
3280af22 2650 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
85e6fe83
LW
2651#else
2652#ifdef HAS_SETRESGID
b28d0864 2653 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
79072805 2654#else
b28d0864
NIS
2655 if (PL_gid == PL_egid) /* special case $( = $) */
2656 (void)PerlProc_setgid(PL_gid);
748a9306 2657 else {
d8eceb89 2658 PL_gid = PerlProc_getgid();
cea2e8a9 2659 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2660 }
79072805
LW
2661#endif
2662#endif
85e6fe83 2663#endif
d8eceb89 2664 PL_gid = PerlProc_getgid();
3280af22 2665 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2666 break;
2667 case ')':
5cd24f17
PP
2668#ifdef HAS_SETGROUPS
2669 {
b83604b4 2670 const char *p = SvPV_const(sv, len);
757f63d8
SP
2671 Groups_t *gary = NULL;
2672
2673 while (isSPACE(*p))
2674 ++p;
2675 PL_egid = Atol(p);
2676 for (i = 0; i < NGROUPS; ++i) {
2677 while (*p && !isSPACE(*p))
2678 ++p;
2679 while (isSPACE(*p))
2680 ++p;
2681 if (!*p)
2682 break;
2683 if(!gary)
2684 Newx(gary, i + 1, Groups_t);
2685 else
2686 Renew(gary, i + 1, Groups_t);
2687 gary[i] = Atol(p);
2688 }
2689 if (i)
2690 (void)setgroups(i, gary);
f5a63d97 2691 Safefree(gary);
5cd24f17
PP
2692 }
2693#else /* HAS_SETGROUPS */
38ab35f8 2694 PL_egid = SvIV(sv);
5cd24f17 2695#endif /* HAS_SETGROUPS */
3280af22
NIS
2696 if (PL_delaymagic) {
2697 PL_delaymagic |= DM_EGID;
79072805
LW
2698 break; /* don't do magic till later */
2699 }
2700#ifdef HAS_SETEGID
3280af22 2701 (void)setegid((Gid_t)PL_egid);
79072805
LW
2702#else
2703#ifdef HAS_SETREGID
b28d0864 2704 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
85e6fe83
LW
2705#else
2706#ifdef HAS_SETRESGID
b28d0864 2707 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
79072805 2708#else
b28d0864
NIS
2709 if (PL_egid == PL_gid) /* special case $) = $( */
2710 (void)PerlProc_setgid(PL_egid);
748a9306 2711 else {
d8eceb89 2712 PL_egid = PerlProc_getegid();
cea2e8a9 2713 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2714 }
79072805
LW
2715#endif
2716#endif
85e6fe83 2717#endif
d8eceb89 2718 PL_egid = PerlProc_getegid();
3280af22 2719 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2720 break;
2721 case ':':
2d8e6c8d 2722 PL_chopset = SvPV_force(sv,len);
79072805
LW
2723 break;
2724 case '0':
e2975953 2725 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS
2726#ifdef HAS_SETPROCTITLE
2727 /* The BSDs don't show the argv[] in ps(1) output, they
2728 * show a string from the process struct and provide
2729 * the setproctitle() routine to manipulate that. */
a2722ac9 2730 if (PL_origalen != 1) {
b83604b4 2731 s = SvPV_const(sv, len);
98b76f99 2732# if __FreeBSD_version > 410001
9aad2c0e 2733 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS
2734 * but not the "(perl) suffix from the ps(1)
2735 * output, because that's what ps(1) shows if the
2736 * argv[] is modified. */
6f2ad931 2737 setproctitle("-%s", s);
9aad2c0e 2738# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS
2739 /* This doesn't really work if you assume that
2740 * $0 = 'foobar'; will wipe out 'perl' from the $0
2741 * because in ps(1) output the result will be like
2742 * sprintf("perl: %s (perl)", s)
2743 * I guess this is a security feature:
2744 * one (a user process) cannot get rid of the original name.
2745 * --jhi */
2746 setproctitle("%s", s);
2747# endif
2748 }
9d3968b2 2749#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 2750 if (PL_origalen != 1) {
17aa7f3d 2751 union pstun un;
b83604b4 2752 s = SvPV_const(sv, len);
6867be6d 2753 un.pst_command = (char *)s;
17aa7f3d
JH
2754 pstat(PSTAT_SETCMD, un, len, 0, 0);
2755 }
9d3968b2 2756#else
2d2af554
GA
2757 if (PL_origalen > 1) {
2758 /* PL_origalen is set in perl_parse(). */
2759 s = SvPV_force(sv,len);
2760 if (len >= (STRLEN)PL_origalen-1) {
2761 /* Longer than original, will be truncated. We assume that
2762 * PL_origalen bytes are available. */
2763 Copy(s, PL_origargv[0], PL_origalen-1, char);
2764 }
2765 else {
2766 /* Shorter than original, will be padded. */
235ac35d 2767#ifdef PERL_DARWIN
60777a0d
JH
2768 /* Special case for Mac OS X: see [perl #38868] */
2769 const int pad = 0;
235ac35d 2770#else
8a89a4f1
MB
2771 /* Is the space counterintuitive? Yes.
2772 * (You were expecting \0?)
2773 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2774 * --jhi */
60777a0d 2775 const int pad = ' ';
235ac35d 2776#endif
60777a0d
JH
2777 Copy(s, PL_origargv[0], len, char);
2778 PL_origargv[0][len] = 0;
2779 memset(PL_origargv[0] + len + 1,
2780 pad, PL_origalen - len - 1);
2d2af554
GA
2781 }
2782 PL_origargv[0][PL_origalen-1] = 0;
2783 for (i = 1; i < PL_origargc; i++)
2784 PL_origargv[i] = 0;
79072805 2785 }
9d3968b2 2786#endif
e2975953 2787 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
2788 break;
2789 }
2790 return 0;
2791}
2792
2793I32
35a4481c 2794Perl_whichsig(pTHX_ const char *sig)
79072805 2795{
aadb217d 2796 register char* const* sigv;
7918f24d
NC
2797
2798 PERL_ARGS_ASSERT_WHICHSIG;
96a5add6 2799 PERL_UNUSED_CONTEXT;
79072805 2800
aadb217d 2801 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
79072805 2802 if (strEQ(sig,*sigv))
aadb217d 2803 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805
LW
2804#ifdef SIGCLD
2805 if (strEQ(sig,"CHLD"))
2806 return SIGCLD;
2807#endif
2808#ifdef SIGCHLD
2809 if (strEQ(sig,"CLD"))
2810 return SIGCHLD;
2811#endif
7f1236c0 2812 return -1;
79072805
LW
2813}
2814
ecfc5424 2815Signal_t
1e82f5a6 2816#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 2817Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
1e82f5a6
SH
2818#else
2819Perl_sighandler(int sig)
2820#endif
79072805 2821{
1018e26f
NIS
2822#ifdef PERL_GET_SIG_CONTEXT
2823 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 2824#else
cea2e8a9 2825 dTHX;
71d280e3 2826#endif
79072805 2827 dSP;
a0714e2c
SS
2828 GV *gv = NULL;
2829 SV *sv = NULL;
8772537c 2830 SV * const tSv = PL_Sv;
601f1833 2831 CV *cv = NULL;
533c011a 2832 OP *myop = PL_op;
84902520 2833 U32 flags = 0;
8772537c 2834 XPV * const tXpv = PL_Xpv;
71d280e3 2835
3280af22 2836 if (PL_savestack_ix + 15 <= PL_savestack_max)
84902520 2837 flags |= 1;
3280af22 2838 if (PL_markstack_ptr < PL_markstack_max - 2)
84902520 2839 flags |= 4;
3280af22 2840 if (PL_scopestack_ix < PL_scopestack_max - 3)
84902520
TB
2841 flags |= 16;
2842
727405f8 2843 if (!PL_psig_ptr[sig]) {
99ef548b 2844 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
2845 PL_sig_name[sig]);
2846 exit(sig);
2847 }
ff0cee69 2848
84902520
TB
2849 /* Max number of items pushed there is 3*n or 4. We cannot fix
2850 infinity, so we fix 4 (in fact 5): */
2851 if (flags & 1) {
3280af22 2852 PL_savestack_ix += 5; /* Protect save in progress. */
8772537c 2853 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
84902520 2854 }
ac27b0f5 2855 if (flags & 4)
3280af22 2856 PL_markstack_ptr++; /* Protect mark. */
84902520 2857 if (flags & 16)
3280af22 2858 PL_scopestack_ix += 1;
84902520 2859 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 2860 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
2861 || SvTYPE(cv) != SVt_PVCV) {
2862 HV *st;
f2c0649b 2863 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 2864 }
84902520 2865
a0d0e21e 2866 if (!cv || !CvROOT(cv)) {
599cee73 2867 if (ckWARN(WARN_SIGNAL))
9014280d 2868 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
22c35a8c 2869 PL_sig_name[sig], (gv ? GvENAME(gv)
00d579c5
GS
2870 : ((cv && CvGV(cv))
2871 ? GvENAME(CvGV(cv))
2872 : "__ANON__")));
2873 goto cleanup;
79072805
LW
2874 }
2875
22c35a8c 2876 if(PL_psig_name[sig]) {
b37c2d43 2877 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
84902520 2878 flags |= 64;
df3728a2 2879#if !defined(PERL_IMPLICIT_CONTEXT)
27da23d5 2880 PL_sig_sv = sv;
df3728a2 2881#endif
84902520 2882 } else {
ff0cee69 2883 sv = sv_newmortal();
22c35a8c 2884 sv_setpv(sv,PL_sig_name[sig]);
88e89b8a 2885 }
e336de0d 2886
e788e7d3 2887 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 2888 PUSHMARK(SP);
79072805 2889 PUSHs(sv);
8aad04aa
JH
2890#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2891 {
2892 struct sigaction oact;
2893
2894 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
2895 if (sip) {
2896 HV *sih = newHV();
ad64d0ec 2897 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
2898 /* The siginfo fields signo, code, errno, pid, uid,
2899 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
2900 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2901 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 2902#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
2903 hv_stores(sih, "errno", newSViv(sip->si_errno));
2904 hv_stores(sih, "status", newSViv(sip->si_status));
2905 hv_stores(sih, "uid", newSViv(sip->si_uid));
2906 hv_stores(sih, "pid", newSViv(sip->si_pid));
2907 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2908 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 2909#endif
8aad04aa 2910 EXTEND(SP, 2);
ad64d0ec 2911 PUSHs(rv);
22f1178f 2912 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 2913 }
b4552a27 2914
8aad04aa
JH
2915 }
2916 }
2917#endif
79072805 2918 PUTBACK;
a0d0e21e 2919
ad64d0ec 2920 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 2921
d3acc0f7 2922 POPSTACK;
1b266415 2923 if (SvTRUE(ERRSV)) {
1d615522 2924#ifndef PERL_MICRO
983dbef6 2925#ifdef HAS_SIGPROCMASK
1b266415
NIS
2926 /* Handler "died", for example to get out of a restart-able read().
2927 * Before we re-do that on its behalf re-enable the signal which was
2928 * blocked by the system when we entered.
2929 */
2930 sigset_t set;
2931 sigemptyset(&set);
2932 sigaddset(&set,sig);
2933 sigprocmask(SIG_UNBLOCK, &set, NULL);
2934#else
2935 /* Not clear if this will work */
2936 (void)rsignal(sig, SIG_IGN);
5c1546dc 2937 (void)rsignal(sig, PL_csighandlerp);
1b266415 2938#endif
1d615522 2939#endif /* !PERL_MICRO */
bd61b366 2940 Perl_die(aTHX_ NULL);
1b266415 2941 }
00d579c5 2942cleanup:
84902520 2943 if (flags & 1)
3280af22 2944 PL_savestack_ix -= 8; /* Unprotect save in progress. */
ac27b0f5 2945 if (flags & 4)
3280af22 2946 PL_markstack_ptr--;
84902520 2947 if (flags & 16)
3280af22 2948 PL_scopestack_ix -= 1;
84902520
TB
2949 if (flags & 64)
2950 SvREFCNT_dec(sv);
533c011a 2951 PL_op = myop; /* Apparently not needed... */
ac27b0f5 2952
3280af22
NIS
2953 PL_Sv = tSv; /* Restore global temporaries. */
2954 PL_Xpv = tXpv;
53bb94e2 2955 return;
79072805 2956}
4e35701f
NIS
2957
2958
51371543 2959static void
8772537c 2960S_restore_magic(pTHX_ const void *p)
51371543 2961{
97aff369 2962 dVAR;
8772537c
AL
2963 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
2964 SV* const sv = mgs->mgs_sv;
51371543
GS
2965
2966 if (!sv)
2967 return;
2968
2969 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
2970 {
f8c7b90f 2971#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC
2972 /* While magic was saved (and off) sv_setsv may well have seen
2973 this SV as a prime candidate for COW. */
2974 if (SvIsCOW(sv))
e424a81e 2975 sv_force_normal_flags(sv, 0);
f9701176
NC
2976#endif
2977
51371543
GS
2978 if (mgs->mgs_flags)
2979 SvFLAGS(sv) |= mgs->mgs_flags;
2980 else
2981 mg_magical(sv);
2b77b520
YST
2982 if (SvGMAGICAL(sv)) {
2983 /* downgrade public flags to private,
2984 and discard any other private flags */
2985
10edeb5d
JH
2986 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
2987 if (pubflags) {
2988 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
2989 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
2b77b520
YST
2990 }
2991 }
51371543
GS
2992 }
2993
2994 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
2995
2996 /* If we're still on top of the stack, pop us off. (That condition
2997 * will be satisfied if restore_magic was called explicitly, but *not*
2998 * if it's being called via leave_scope.)
2999 * The reason for doing this is that otherwise, things like sv_2cv()
3000 * may leave alloc gunk on the savestack, and some code
3001 * (e.g. sighandler) doesn't expect that...
3002 */
3003 if (PL_savestack_ix == mgs->mgs_ss_ix)
3004 {
3005 I32 popval = SSPOPINT;
c76ac1ee 3006 assert(popval == SAVEt_DESTRUCTOR_X);
51371543
GS
3007 PL_savestack_ix -= 2;
3008 popval = SSPOPINT;
3009 assert(popval == SAVEt_ALLOC);
3010 popval = SSPOPINT;
3011 PL_savestack_ix -= popval;
3012 }
3013
3014}
3015
3016static void
8772537c 3017S_unwind_handler_stack(pTHX_ const void *p)
51371543 3018{
27da23d5 3019 dVAR;
e1ec3a88 3020 const U32 flags = *(const U32*)p;
51371543 3021
7918f24d
NC
3022 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3023
51371543
GS
3024 if (flags & 1)
3025 PL_savestack_ix -= 5; /* Unprotect save in progress. */
df3728a2 3026#if !defined(PERL_IMPLICIT_CONTEXT)
51371543 3027 if (flags & 64)
27da23d5 3028 SvREFCNT_dec(PL_sig_sv);
df3728a2 3029#endif
51371543 3030}
1018e26f 3031
66610fdd 3032/*
b3ca2e83
NC
3033=for apidoc magic_sethint
3034
3035Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC
3036C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3037anything that would need a deep copy. Maybe we should warn if we find a
3038reference.
b3ca2e83
NC
3039
3040=cut
3041*/
3042int
3043Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3044{
3045 dVAR;
ad64d0ec 3046 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3047 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3048
7918f24d
NC
3049 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3050
e6e3e454
NC
3051 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3052 an alternative leaf in there, with PL_compiling.cop_hints being used if
3053 it's NULL. If needed for threads, the alternative could lock a mutex,
3054 or take other more complex action. */
3055
5b9c0671
NC
3056 /* Something changed in %^H, so it will need to be restored on scope exit.
3057 Doing this here saves a lot of doing it manually in perl code (and
3058 forgetting to do it, and consequent subtle errors. */
3059 PL_hints |= HINT_LOCALIZE_HH;
c28fe1ec 3060 PL_compiling.cop_hints_hash
fc92a12d 3061 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
b3ca2e83
NC
3062 return 0;
3063}
3064
3065/*
f175cff5 3066=for apidoc magic_clearhint
b3ca2e83 3067
c28fe1ec
NC
3068Triggered by a delete from %^H, records the key to
3069C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC
3070
3071=cut
3072*/
3073int
3074Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3075{
3076 dVAR;
7918f24d
NC
3077
3078 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL
3079 PERL_UNUSED_ARG(sv);
3080
b3ca2e83
NC
3081 assert(mg->mg_len == HEf_SVKEY);
3082
b3f24c00
MHM
3083 PERL_UNUSED_ARG(sv);
3084
5b9c0671 3085 PL_hints |= HINT_LOCALIZE_HH;
c28fe1ec
NC
3086 PL_compiling.cop_hints_hash
3087 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
ad64d0ec 3088 MUTABLE_SV(mg->mg_ptr), &PL_sv_placeholder);
b3ca2e83
NC
3089 return 0;
3090}
3091
3092/*
66610fdd
RGS
3093 * Local variables:
3094 * c-indentation-style: bsd
3095 * c-basic-offset: 4
3096 * indent-tabs-mode: t
3097 * End:
3098 *
37442d52
RGS
3099 * ex: set ts=8 sts=4 sw=4 noet:
3100 */