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a0d0e21e 1/* mg.c
79072805 2 *
1129b882
NC
3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 * 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
79072805
LW
5 *
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
8 *
a0d0e21e
LW
9 */
10
11/*
4ac71550
TC
12 * Sam sat on the ground and put his head in his hands. 'I wish I had never
13 * come here, and I don't want to see no more magic,' he said, and fell silent.
14 *
15 * [p.363 of _The Lord of the Rings_, II/vii: "The Mirror of Galadriel"]
79072805
LW
16 */
17
ccfc67b7
JH
18/*
19=head1 Magical Functions
166f8a29
DM
20
21"Magic" is special data attached to SV structures in order to give them
22"magical" properties. When any Perl code tries to read from, or assign to,
23an SV marked as magical, it calls the 'get' or 'set' function associated
24with that SV's magic. A get is called prior to reading an SV, in order to
ddfa107c 25give it a chance to update its internal value (get on $. writes the line
166f8a29
DM
26number of the last read filehandle into to the SV's IV slot), while
27set is called after an SV has been written to, in order to allow it to make
ddfa107c 28use of its changed value (set on $/ copies the SV's new value to the
166f8a29
DM
29PL_rs global variable).
30
31Magic is implemented as a linked list of MAGIC structures attached to the
32SV. Each MAGIC struct holds the type of the magic, a pointer to an array
33of functions that implement the get(), set(), length() etc functions,
34plus space for some flags and pointers. For example, a tied variable has
35a MAGIC structure that contains a pointer to the object associated with the
36tie.
37
ccfc67b7
JH
38*/
39
79072805 40#include "EXTERN.h"
864dbfa3 41#define PERL_IN_MG_C
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LW
42#include "perl.h"
43
5cd24f17 44#if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
b7953727
JH
45# ifdef I_GRP
46# include <grp.h>
47# endif
188ea221
CS
48#endif
49
757f63d8
SP
50#if defined(HAS_SETGROUPS)
51# ifndef NGROUPS
52# define NGROUPS 32
53# endif
54#endif
55
17aa7f3d
JH
56#ifdef __hpux
57# include <sys/pstat.h>
58#endif
59
8aad04aa 60#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 61Signal_t Perl_csighandler(int sig, siginfo_t *, void *);
8aad04aa 62#else
e69880a5 63Signal_t Perl_csighandler(int sig);
8aad04aa 64#endif
e69880a5 65
9cffb111
OS
66#ifdef __Lynx__
67/* Missing protos on LynxOS */
68void setruid(uid_t id);
69void seteuid(uid_t id);
70void setrgid(uid_t id);
71void setegid(uid_t id);
72#endif
73
c07a80fd
PP
74/*
75 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
76 */
77
78struct magic_state {
79 SV* mgs_sv;
80 U32 mgs_flags;
455ece5e 81 I32 mgs_ss_ix;
c07a80fd 82};
455ece5e 83/* MGS is typedef'ed to struct magic_state in perl.h */
76e3520e
GS
84
85STATIC void
8fb26106 86S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
c07a80fd 87{
97aff369 88 dVAR;
455ece5e 89 MGS* mgs;
7918f24d
NC
90
91 PERL_ARGS_ASSERT_SAVE_MAGIC;
92
c07a80fd 93 assert(SvMAGICAL(sv));
d8b2590f
NC
94 /* Turning READONLY off for a copy-on-write scalar (including shared
95 hash keys) is a bad idea. */
765f542d 96 if (SvIsCOW(sv))
9a265e59 97 sv_force_normal_flags(sv, 0);
c07a80fd 98
8772537c 99 SAVEDESTRUCTOR_X(S_restore_magic, INT2PTR(void*, (IV)mgs_ix));
455ece5e
AD
100
101 mgs = SSPTR(mgs_ix, MGS*);
c07a80fd
PP
102 mgs->mgs_sv = sv;
103 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
455ece5e 104 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
c07a80fd
PP
105
106 SvMAGICAL_off(sv);
107 SvREADONLY_off(sv);
085bde85
NC
108 if (!(SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK))) {
109 /* No public flags are set, so promote any private flags to public. */
110 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
111 }
c07a80fd
PP
112}
113
954c1994
GS
114/*
115=for apidoc mg_magical
116
117Turns on the magical status of an SV. See C<sv_magic>.
118
119=cut
120*/
121
8990e307 122void
864dbfa3 123Perl_mg_magical(pTHX_ SV *sv)
8990e307 124{
e1ec3a88 125 const MAGIC* mg;
7918f24d 126 PERL_ARGS_ASSERT_MG_MAGICAL;
96a5add6 127 PERL_UNUSED_CONTEXT;
218787bd
VP
128 if ((mg = SvMAGIC(sv))) {
129 SvRMAGICAL_off(sv);
130 do {
131 const MGVTBL* const vtbl = mg->mg_virtual;
132 if (vtbl) {
133 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
134 SvGMAGICAL_on(sv);
135 if (vtbl->svt_set)
136 SvSMAGICAL_on(sv);
137 if (vtbl->svt_clear)
138 SvRMAGICAL_on(sv);
139 }
140 } while ((mg = mg->mg_moremagic));
141 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)))
142 SvRMAGICAL_on(sv);
8990e307
LW
143 }
144}
145
2767dea0
DM
146
147/* is this container magic (%ENV, $1 etc), or value magic (pos, taint etc)? */
148
149STATIC bool
150S_is_container_magic(const MAGIC *mg)
151{
7918f24d 152 assert(mg);
2767dea0
DM
153 switch (mg->mg_type) {
154 case PERL_MAGIC_bm:
155 case PERL_MAGIC_fm:
156 case PERL_MAGIC_regex_global:
157 case PERL_MAGIC_nkeys:
158#ifdef USE_LOCALE_COLLATE
159 case PERL_MAGIC_collxfrm:
160#endif
161 case PERL_MAGIC_qr:
162 case PERL_MAGIC_taint:
163 case PERL_MAGIC_vec:
164 case PERL_MAGIC_vstring:
165 case PERL_MAGIC_utf8:
166 case PERL_MAGIC_substr:
167 case PERL_MAGIC_defelem:
168 case PERL_MAGIC_arylen:
169 case PERL_MAGIC_pos:
170 case PERL_MAGIC_backref:
171 case PERL_MAGIC_arylen_p:
172 case PERL_MAGIC_rhash:
173 case PERL_MAGIC_symtab:
174 return 0;
175 default:
176 return 1;
177 }
178}
179
954c1994
GS
180/*
181=for apidoc mg_get
182
183Do magic after a value is retrieved from the SV. See C<sv_magic>.
184
185=cut
186*/
187
79072805 188int
864dbfa3 189Perl_mg_get(pTHX_ SV *sv)
79072805 190{
97aff369 191 dVAR;
35a4481c 192 const I32 mgs_ix = SSNEW(sizeof(MGS));
fe2774ed 193 const bool was_temp = (bool)SvTEMP(sv);
0723351e 194 int have_new = 0;
ff76feab 195 MAGIC *newmg, *head, *cur, *mg;
20135930 196 /* guard against sv having being freed midway by holding a private
6683b158
NC
197 reference. */
198
7918f24d
NC
199 PERL_ARGS_ASSERT_MG_GET;
200
6683b158
NC
201 /* sv_2mortal has this side effect of turning on the TEMP flag, which can
202 cause the SV's buffer to get stolen (and maybe other stuff).
203 So restore it.
204 */
46da273f 205 sv_2mortal(SvREFCNT_inc_simple_NN(sv));
6683b158
NC
206 if (!was_temp) {
207 SvTEMP_off(sv);
208 }
209
455ece5e 210 save_magic(mgs_ix, sv);
463ee0b2 211
ff76feab
AMS
212 /* We must call svt_get(sv, mg) for each valid entry in the linked
213 list of magic. svt_get() may delete the current entry, add new
214 magic to the head of the list, or upgrade the SV. AMS 20010810 */
215
216 newmg = cur = head = mg = SvMAGIC(sv);
217 while (mg) {
35a4481c 218 const MGVTBL * const vtbl = mg->mg_virtual;
ff76feab 219
2b260de0 220 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
316ad4fe 221 CALL_FPTR(vtbl->svt_get)(aTHX_ sv, mg);
b77f7d40 222
58f82c5c
DM
223 /* guard against magic having been deleted - eg FETCH calling
224 * untie */
225 if (!SvMAGIC(sv))
226 break;
b77f7d40 227
ff76feab
AMS
228 /* Don't restore the flags for this entry if it was deleted. */
229 if (mg->mg_flags & MGf_GSKIP)
230 (SSPTR(mgs_ix, MGS *))->mgs_flags = 0;
a0d0e21e 231 }
ff76feab
AMS
232
233 mg = mg->mg_moremagic;
234
0723351e 235 if (have_new) {
ff76feab
AMS
236 /* Have we finished with the new entries we saw? Start again
237 where we left off (unless there are more new entries). */
238 if (mg == head) {
0723351e 239 have_new = 0;
ff76feab
AMS
240 mg = cur;
241 head = newmg;
242 }
243 }
244
245 /* Were any new entries added? */
0723351e
NC
246 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
247 have_new = 1;
ff76feab
AMS
248 cur = mg;
249 mg = newmg;
760ac839 250 }
79072805 251 }
463ee0b2 252
8772537c 253 restore_magic(INT2PTR(void *, (IV)mgs_ix));
6683b158
NC
254
255 if (SvREFCNT(sv) == 1) {
256 /* We hold the last reference to this SV, which implies that the
257 SV was deleted as a side effect of the routines we called. */
0c34ef67 258 SvOK_off(sv);
6683b158 259 }
79072805
LW
260 return 0;
261}
262
954c1994
GS
263/*
264=for apidoc mg_set
265
266Do magic after a value is assigned to the SV. See C<sv_magic>.
267
268=cut
269*/
270
79072805 271int
864dbfa3 272Perl_mg_set(pTHX_ SV *sv)
79072805 273{
97aff369 274 dVAR;
35a4481c 275 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 276 MAGIC* mg;
463ee0b2
LW
277 MAGIC* nextmg;
278
7918f24d
NC
279 PERL_ARGS_ASSERT_MG_SET;
280
455ece5e 281 save_magic(mgs_ix, sv);
463ee0b2
LW
282
283 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
e1ec3a88 284 const MGVTBL* vtbl = mg->mg_virtual;
463ee0b2 285 nextmg = mg->mg_moremagic; /* it may delete itself */
a0d0e21e
LW
286 if (mg->mg_flags & MGf_GSKIP) {
287 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
455ece5e 288 (SSPTR(mgs_ix, MGS*))->mgs_flags = 0;
a0d0e21e 289 }
e7cbf6c6
DM
290 if (PL_localizing == 2 && !S_is_container_magic(mg))
291 continue;
2b260de0 292 if (vtbl && vtbl->svt_set)
fc0dc3b3 293 CALL_FPTR(vtbl->svt_set)(aTHX_ sv, mg);
79072805 294 }
463ee0b2 295
8772537c 296 restore_magic(INT2PTR(void*, (IV)mgs_ix));
79072805
LW
297 return 0;
298}
299
954c1994
GS
300/*
301=for apidoc mg_length
302
303Report on the SV's length. See C<sv_magic>.
304
305=cut
306*/
307
79072805 308U32
864dbfa3 309Perl_mg_length(pTHX_ SV *sv)
79072805 310{
97aff369 311 dVAR;
79072805 312 MAGIC* mg;
463ee0b2 313 STRLEN len;
463ee0b2 314
7918f24d
NC
315 PERL_ARGS_ASSERT_MG_LENGTH;
316
79072805 317 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 318 const MGVTBL * const vtbl = mg->mg_virtual;
2b260de0 319 if (vtbl && vtbl->svt_len) {
35a4481c 320 const I32 mgs_ix = SSNEW(sizeof(MGS));
455ece5e 321 save_magic(mgs_ix, sv);
a0d0e21e 322 /* omit MGf_GSKIP -- not changed here */
fc0dc3b3 323 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
8772537c 324 restore_magic(INT2PTR(void*, (IV)mgs_ix));
85e6fe83
LW
325 return len;
326 }
327 }
328
d0644529
NC
329 {
330 /* You can't know whether it's UTF-8 until you get the string again...
331 */
10516c54 332 const U8 *s = (U8*)SvPV_const(sv, len);
d0644529
NC
333
334 if (DO_UTF8(sv)) {
335 len = utf8_length(s, s + len);
336 }
5636d518 337 }
463ee0b2 338 return len;
79072805
LW
339}
340
8fb26106 341I32
864dbfa3 342Perl_mg_size(pTHX_ SV *sv)
93965878
NIS
343{
344 MAGIC* mg;
ac27b0f5 345
7918f24d
NC
346 PERL_ARGS_ASSERT_MG_SIZE;
347
93965878 348 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
35a4481c 349 const MGVTBL* const vtbl = mg->mg_virtual;
2b260de0 350 if (vtbl && vtbl->svt_len) {
35a4481c
AL
351 const I32 mgs_ix = SSNEW(sizeof(MGS));
352 I32 len;
455ece5e 353 save_magic(mgs_ix, sv);
93965878 354 /* omit MGf_GSKIP -- not changed here */
fc0dc3b3 355 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
8772537c 356 restore_magic(INT2PTR(void*, (IV)mgs_ix));
93965878
NIS
357 return len;
358 }
359 }
360
361 switch(SvTYPE(sv)) {
362 case SVt_PVAV:
502c6561 363 return AvFILLp((const AV *) sv); /* Fallback to non-tied array */
93965878
NIS
364 case SVt_PVHV:
365 /* FIXME */
366 default:
cea2e8a9 367 Perl_croak(aTHX_ "Size magic not implemented");
93965878
NIS
368 break;
369 }
370 return 0;
371}
372
954c1994
GS
373/*
374=for apidoc mg_clear
375
376Clear something magical that the SV represents. See C<sv_magic>.
377
378=cut
379*/
380
79072805 381int
864dbfa3 382Perl_mg_clear(pTHX_ SV *sv)
79072805 383{
35a4481c 384 const I32 mgs_ix = SSNEW(sizeof(MGS));
79072805 385 MAGIC* mg;
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
2d4fcd5e 1442 to_dec = PL_psig_ptr[i];
38a124f0
NC
1443 if (sv) {
1444 PL_psig_ptr[i] = SvREFCNT_inc_simple_NN(sv);
1445 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
79fd3822
NC
1446
1447 /* Signals don't change name during the program's execution, so once
1448 they're cached in the appropriate slot of PL_psig_name, they can
1449 stay there.
1450
1451 Ideally we'd find some way of making SVs at (C) compile time, or
1452 at least, doing most of the work. */
1453 if (!PL_psig_name[i]) {
1454 PL_psig_name[i] = newSVpvn(s, len);
1455 SvREADONLY_on(PL_psig_name[i]);
1456 }
38a124f0 1457 } else {
79fd3822 1458 SvREFCNT_dec(PL_psig_name[i]);
38a124f0
NC
1459 PL_psig_name[i] = NULL;
1460 PL_psig_ptr[i] = NULL;
1461 }
748a9306 1462 }
38a124f0 1463 if (sv && (isGV_with_GP(sv) || SvROK(sv))) {
2d4fcd5e 1464 if (i) {
5c1546dc 1465 (void)rsignal(i, PL_csighandlerp);
2d4fcd5e 1466 }
748a9306 1467 else
b37c2d43 1468 *svp = SvREFCNT_inc_simple_NN(sv);
38a124f0 1469 } else {
9dfa190b
NC
1470 if (sv && SvOK(sv)) {
1471 s = SvPV_force(sv, len);
1472 } else {
1473 sv = NULL;
1474 }
1475 if (sv && strEQ(s,"IGNORE")) {
1476 if (i) {
23ada85b 1477#ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
9dfa190b
NC
1478 PL_sig_ignoring[i] = 1;
1479 (void)rsignal(i, PL_csighandlerp);
85b332e2 1480#else
9dfa190b 1481 (void)rsignal(i, (Sighandler_t) SIG_IGN);
85b332e2 1482#endif
9dfa190b 1483 }
2d4fcd5e 1484 }
9dfa190b
NC
1485 else if (!sv || strEQ(s,"DEFAULT") || !len) {
1486 if (i) {
2e34cc90 1487#ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
9dfa190b
NC
1488 PL_sig_defaulting[i] = 1;
1489 (void)rsignal(i, PL_csighandlerp);
2e34cc90 1490#else
9dfa190b 1491 (void)rsignal(i, (Sighandler_t) SIG_DFL);
2e34cc90 1492#endif
9dfa190b
NC
1493 }
1494 }
1495 else {
1496 /*
1497 * We should warn if HINT_STRICT_REFS, but without
1498 * access to a known hint bit in a known OP, we can't
1499 * tell whether HINT_STRICT_REFS is in force or not.
1500 */
1501 if (!strchr(s,':') && !strchr(s,'\''))
1502 Perl_sv_insert_flags(aTHX_ sv, 0, 0, STR_WITH_LEN("main::"),
1503 SV_GMAGIC);
1504 if (i)
1505 (void)rsignal(i, PL_csighandlerp);
1506 else
1507 *svp = SvREFCNT_inc_simple_NN(sv);
136e0459 1508 }
748a9306 1509 }
9dfa190b 1510
2d4fcd5e
AJ
1511#ifdef HAS_SIGPROCMASK
1512 if(i)
1513 LEAVE;
1514#endif
1515 if(to_dec)
1516 SvREFCNT_dec(to_dec);
79072805
LW
1517 return 0;
1518}
64ca3a65 1519#endif /* !PERL_MICRO */
79072805
LW
1520
1521int
864dbfa3 1522Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
79072805 1523{
97aff369 1524 dVAR;
08aeb9f7 1525 HV* stash;
7918f24d
NC
1526
1527 PERL_ARGS_ASSERT_MAGIC_SETISA;
8772537c 1528 PERL_UNUSED_ARG(sv);
e1a479c5 1529
08aeb9f7
BB
1530 /* Bail out if destruction is going on */
1531 if(PL_dirty) return 0;
1532
89c14e2e
BB
1533 /* Skip _isaelem because _isa will handle it shortly */
1534 if (PL_delaymagic & DM_ARRAY && mg->mg_type == PERL_MAGIC_isaelem)
1535 return 0;
1536
70cd14a1
CB
1537 /* XXX Once it's possible, we need to
1538 detect that our @ISA is aliased in
1539 other stashes, and act on the stashes
1540 of all of the aliases */
1541
e1a479c5
BB
1542 /* The first case occurs via setisa,
1543 the second via setisa_elem, which
1544 calls this same magic */
08aeb9f7
BB
1545 stash = GvSTASH(
1546 SvTYPE(mg->mg_obj) == SVt_PVGV
159b6efe
NC
1547 ? (const GV *)mg->mg_obj
1548 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
e1a479c5
BB
1549 );
1550
5562fa71
RGS
1551 if (stash)
1552 mro_isa_changed_in(stash);
08aeb9f7 1553
463ee0b2
LW
1554 return 0;
1555}
1556
1557int
52b45067
RD
1558Perl_magic_clearisa(pTHX_ SV *sv, MAGIC *mg)
1559{
1560 dVAR;
1561 HV* stash;
1562
7918f24d
NC
1563 PERL_ARGS_ASSERT_MAGIC_CLEARISA;
1564
52b45067
RD
1565 /* Bail out if destruction is going on */
1566 if(PL_dirty) return 0;
1567
502c6561 1568 av_clear(MUTABLE_AV(sv));
52b45067
RD
1569
1570 /* XXX see comments in magic_setisa */
1571 stash = GvSTASH(
1572 SvTYPE(mg->mg_obj) == SVt_PVGV
159b6efe
NC
1573 ? (const GV *)mg->mg_obj
1574 : (const GV *)mg_find(mg->mg_obj, PERL_MAGIC_isa)->mg_obj
52b45067
RD
1575 );
1576
5562fa71
RGS
1577 if (stash)
1578 mro_isa_changed_in(stash);
52b45067
RD
1579
1580 return 0;
1581}
1582
1583int
864dbfa3 1584Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1585{
97aff369 1586 dVAR;
7918f24d 1587 PERL_ARGS_ASSERT_MAGIC_SETAMAGIC;
8772537c
AL
1588 PERL_UNUSED_ARG(sv);
1589 PERL_UNUSED_ARG(mg);
3280af22 1590 PL_amagic_generation++;
463ee0b2 1591
a0d0e21e
LW
1592 return 0;
1593}
463ee0b2 1594
946ec16e 1595int
864dbfa3 1596Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
6ff81951 1597{
85fbaab2 1598 HV * const hv = MUTABLE_HV(LvTARG(sv));
6ff81951 1599 I32 i = 0;
7918f24d
NC
1600
1601 PERL_ARGS_ASSERT_MAGIC_GETNKEYS;
8772537c 1602 PERL_UNUSED_ARG(mg);
7719e241 1603
6ff81951 1604 if (hv) {
497b47a8 1605 (void) hv_iterinit(hv);
ad64d0ec 1606 if (! SvTIED_mg((const SV *)hv, PERL_MAGIC_tied))
497b47a8
JH
1607 i = HvKEYS(hv);
1608 else {
1609 while (hv_iternext(hv))
1610 i++;
1611 }
6ff81951
GS
1612 }
1613
1614 sv_setiv(sv, (IV)i);
1615 return 0;
1616}
1617
1618int
864dbfa3 1619Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
946ec16e 1620{
7918f24d 1621 PERL_ARGS_ASSERT_MAGIC_SETNKEYS;
8772537c 1622 PERL_UNUSED_ARG(mg);
946ec16e 1623 if (LvTARG(sv)) {
85fbaab2 1624 hv_ksplit(MUTABLE_HV(LvTARG(sv)), SvIV(sv));
946ec16e
PP
1625 }
1626 return 0;
ac27b0f5 1627}
946ec16e 1628
e336de0d 1629/* caller is responsible for stack switching/cleanup */
565764a8 1630STATIC int
e1ec3a88 1631S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
a0d0e21e 1632{
97aff369 1633 dVAR;
a0d0e21e 1634 dSP;
463ee0b2 1635
7918f24d
NC
1636 PERL_ARGS_ASSERT_MAGIC_METHCALL;
1637
924508f0
GS
1638 PUSHMARK(SP);
1639 EXTEND(SP, n);
33c27489 1640 PUSHs(SvTIED_obj(sv, mg));
ac27b0f5 1641 if (n > 1) {
93965878 1642 if (mg->mg_ptr) {
565764a8 1643 if (mg->mg_len >= 0)
6e449a3a 1644 mPUSHp(mg->mg_ptr, mg->mg_len);
565764a8 1645 else if (mg->mg_len == HEf_SVKEY)
ad64d0ec 1646 PUSHs(MUTABLE_SV(mg->mg_ptr));
93965878 1647 }
14befaf4 1648 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
6e449a3a 1649 mPUSHi(mg->mg_len);
93965878
NIS
1650 }
1651 }
1652 if (n > 2) {
1653 PUSHs(val);
88e89b8a 1654 }
463ee0b2
LW
1655 PUTBACK;
1656
864dbfa3 1657 return call_method(meth, flags);
946ec16e
PP
1658}
1659
76e3520e 1660STATIC int
e1ec3a88 1661S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
a0d0e21e 1662{
27da23d5 1663 dVAR; dSP;
463ee0b2 1664
7918f24d
NC
1665 PERL_ARGS_ASSERT_MAGIC_METHPACK;
1666
a0d0e21e
LW
1667 ENTER;
1668 SAVETMPS;
e788e7d3 1669 PUSHSTACKi(PERLSI_MAGIC);
463ee0b2 1670
33c27489 1671 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
3280af22 1672 sv_setsv(sv, *PL_stack_sp--);
93965878 1673 }
463ee0b2 1674
d3acc0f7 1675 POPSTACK;
a0d0e21e
LW
1676 FREETMPS;
1677 LEAVE;
1678 return 0;
1679}
463ee0b2 1680
a0d0e21e 1681int
864dbfa3 1682Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1683{
7918f24d
NC
1684 PERL_ARGS_ASSERT_MAGIC_GETPACK;
1685
a0d0e21e
LW
1686 if (mg->mg_ptr)
1687 mg->mg_flags |= MGf_GSKIP;
58f82c5c 1688 magic_methpack(sv,mg,"FETCH");
463ee0b2
LW
1689 return 0;
1690}
1691
1692int
864dbfa3 1693Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
e336de0d 1694{
27da23d5 1695 dVAR; dSP;
7918f24d
NC
1696
1697 PERL_ARGS_ASSERT_MAGIC_SETPACK;
1698
a60c0954 1699 ENTER;
e788e7d3 1700 PUSHSTACKi(PERLSI_MAGIC);
33c27489 1701 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
d3acc0f7 1702 POPSTACK;
a60c0954 1703 LEAVE;
463ee0b2
LW
1704 return 0;
1705}
1706
1707int
864dbfa3 1708Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 1709{
7918f24d
NC
1710 PERL_ARGS_ASSERT_MAGIC_CLEARPACK;
1711
a0d0e21e
LW
1712 return magic_methpack(sv,mg,"DELETE");
1713}
463ee0b2 1714
93965878
NIS
1715
1716U32
864dbfa3 1717Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
ac27b0f5 1718{
27da23d5 1719 dVAR; dSP;
22846ab4 1720 I32 retval = 0;
93965878 1721
7918f24d
NC
1722 PERL_ARGS_ASSERT_MAGIC_SIZEPACK;
1723
93965878
NIS
1724 ENTER;
1725 SAVETMPS;
e788e7d3 1726 PUSHSTACKi(PERLSI_MAGIC);
33c27489 1727 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
3280af22 1728 sv = *PL_stack_sp--;
22846ab4
AB
1729 retval = SvIV(sv)-1;
1730 if (retval < -1)
1731 Perl_croak(aTHX_ "FETCHSIZE returned a negative value");
93965878 1732 }
d3acc0f7 1733 POPSTACK;
93965878
NIS
1734 FREETMPS;
1735 LEAVE;
22846ab4 1736 return (U32) retval;
93965878
NIS
1737}
1738
cea2e8a9
GS
1739int
1740Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1741{
27da23d5 1742 dVAR; dSP;
463ee0b2 1743
7918f24d
NC
1744 PERL_ARGS_ASSERT_MAGIC_WIPEPACK;
1745
e336de0d 1746 ENTER;
e788e7d3 1747 PUSHSTACKi(PERLSI_MAGIC);
924508f0 1748 PUSHMARK(SP);
33c27489 1749 XPUSHs(SvTIED_obj(sv, mg));
463ee0b2 1750 PUTBACK;
864dbfa3 1751 call_method("CLEAR", G_SCALAR|G_DISCARD);
d3acc0f7 1752 POPSTACK;
a60c0954 1753 LEAVE;
a3bcc51e 1754
463ee0b2
LW
1755 return 0;
1756}
1757
1758int
864dbfa3 1759Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
463ee0b2 1760{
27da23d5 1761 dVAR; dSP;
666ea192 1762 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
463ee0b2 1763
7918f24d
NC
1764 PERL_ARGS_ASSERT_MAGIC_NEXTPACK;
1765
463ee0b2 1766 ENTER;
a0d0e21e 1767 SAVETMPS;
e788e7d3 1768 PUSHSTACKi(PERLSI_MAGIC);
924508f0
GS
1769 PUSHMARK(SP);
1770 EXTEND(SP, 2);
33c27489 1771 PUSHs(SvTIED_obj(sv, mg));
463ee0b2
LW
1772 if (SvOK(key))
1773 PUSHs(key);
1774 PUTBACK;
1775
864dbfa3 1776 if (call_method(meth, G_SCALAR))
3280af22 1777 sv_setsv(key, *PL_stack_sp--);
463ee0b2 1778
d3acc0f7 1779 POPSTACK;
a0d0e21e
LW
1780 FREETMPS;
1781 LEAVE;
79072805
LW
1782 return 0;
1783}
1784
1785int
1146e912 1786Perl_magic_existspack(pTHX_ SV *sv, const MAGIC *mg)
a0d0e21e 1787{
7918f24d
NC
1788 PERL_ARGS_ASSERT_MAGIC_EXISTSPACK;
1789
a0d0e21e 1790 return magic_methpack(sv,mg,"EXISTS");
ac27b0f5 1791}
a0d0e21e 1792
a3bcc51e
TP
1793SV *
1794Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1795{
27da23d5 1796 dVAR; dSP;
5fcbf73d 1797 SV *retval;
ad64d0ec
NC
1798 SV * const tied = SvTIED_obj(MUTABLE_SV(hv), mg);
1799 HV * const pkg = SvSTASH((const SV *)SvRV(tied));
a3bcc51e 1800
7918f24d
NC
1801 PERL_ARGS_ASSERT_MAGIC_SCALARPACK;
1802
a3bcc51e
TP
1803 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1804 SV *key;
bfcb3514 1805 if (HvEITER_get(hv))
a3bcc51e
TP
1806 /* we are in an iteration so the hash cannot be empty */
1807 return &PL_sv_yes;
1808 /* no xhv_eiter so now use FIRSTKEY */
1809 key = sv_newmortal();
ad64d0ec 1810 magic_nextpack(MUTABLE_SV(hv), mg, key);
bfcb3514 1811 HvEITER_set(hv, NULL); /* need to reset iterator */
a3bcc51e
TP
1812 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1813 }
1814
1815 /* there is a SCALAR method that we can call */
1816 ENTER;
1817 PUSHSTACKi(PERLSI_MAGIC);
1818 PUSHMARK(SP);
1819 EXTEND(SP, 1);
1820 PUSHs(tied);
1821 PUTBACK;
1822
1823 if (call_method("SCALAR", G_SCALAR))
1824 retval = *PL_stack_sp--;
5fcbf73d
AL
1825 else
1826 retval = &PL_sv_undef;
a3bcc51e
TP
1827 POPSTACK;
1828 LEAVE;
1829 return retval;
1830}
1831
a0d0e21e 1832int
864dbfa3 1833Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
79072805 1834{
97aff369 1835 dVAR;
8772537c
AL
1836 GV * const gv = PL_DBline;
1837 const I32 i = SvTRUE(sv);
1838 SV ** const svp = av_fetch(GvAV(gv),
01b8bcb7 1839 atoi(MgPV_nolen_const(mg)), FALSE);
7918f24d
NC
1840
1841 PERL_ARGS_ASSERT_MAGIC_SETDBLINE;
1842
8772537c
AL
1843 if (svp && SvIOKp(*svp)) {
1844 OP * const o = INT2PTR(OP*,SvIVX(*svp));
1845 if (o) {
1846 /* set or clear breakpoint in the relevant control op */
1847 if (i)
1848 o->op_flags |= OPf_SPECIAL;
1849 else
1850 o->op_flags &= ~OPf_SPECIAL;
1851 }
5df8de69 1852 }
79072805
LW
1853 return 0;
1854}
1855
1856int
8772537c 1857Perl_magic_getarylen(pTHX_ SV *sv, const MAGIC *mg)
79072805 1858{
97aff369 1859 dVAR;
502c6561 1860 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
1861
1862 PERL_ARGS_ASSERT_MAGIC_GETARYLEN;
1863
83bf042f 1864 if (obj) {
fc15ae8f 1865 sv_setiv(sv, AvFILL(obj) + CopARYBASE_get(PL_curcop));
83bf042f
NC
1866 } else {
1867 SvOK_off(sv);
1868 }
79072805
LW
1869 return 0;
1870}
1871
1872int
864dbfa3 1873Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
79072805 1874{
97aff369 1875 dVAR;
502c6561 1876 AV * const obj = MUTABLE_AV(mg->mg_obj);
7918f24d
NC
1877
1878 PERL_ARGS_ASSERT_MAGIC_SETARYLEN;
1879
83bf042f 1880 if (obj) {
fc15ae8f 1881 av_fill(obj, SvIV(sv) - CopARYBASE_get(PL_curcop));
83bf042f
NC
1882 } else {
1883 if (ckWARN(WARN_MISC))
1884 Perl_warner(aTHX_ packWARN(WARN_MISC),
1885 "Attempt to set length of freed array");
1886 }
1887 return 0;
1888}
1889
1890int
1891Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1892{
97aff369 1893 dVAR;
7918f24d
NC
1894
1895 PERL_ARGS_ASSERT_MAGIC_FREEARYLEN_P;
53c1dcc0 1896 PERL_UNUSED_ARG(sv);
7918f24d 1897
94f3782b
DM
1898 /* during global destruction, mg_obj may already have been freed */
1899 if (PL_in_clean_all)
1ea47f64 1900 return 0;
94f3782b 1901
83bf042f
NC
1902 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1903
1904 if (mg) {
1905 /* arylen scalar holds a pointer back to the array, but doesn't own a
1906 reference. Hence the we (the array) are about to go away with it
1907 still pointing at us. Clear its pointer, else it would be pointing
1908 at free memory. See the comment in sv_magic about reference loops,
1909 and why it can't own a reference to us. */
1910 mg->mg_obj = 0;
1911 }
a0d0e21e
LW
1912 return 0;
1913}
1914
1915int
864dbfa3 1916Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1917{
97aff369 1918 dVAR;
8772537c 1919 SV* const lsv = LvTARG(sv);
7918f24d
NC
1920
1921 PERL_ARGS_ASSERT_MAGIC_GETPOS;
3881461a 1922 PERL_UNUSED_ARG(mg);
ac27b0f5 1923
a0d0e21e 1924 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
3881461a
AL
1925 MAGIC * const found = mg_find(lsv, PERL_MAGIC_regex_global);
1926 if (found && found->mg_len >= 0) {
1927 I32 i = found->mg_len;
7e2040f0 1928 if (DO_UTF8(lsv))
a0ed51b3 1929 sv_pos_b2u(lsv, &i);
fc15ae8f 1930 sv_setiv(sv, i + CopARYBASE_get(PL_curcop));
a0d0e21e
LW
1931 return 0;
1932 }
1933 }
0c34ef67 1934 SvOK_off(sv);
a0d0e21e
LW
1935 return 0;
1936}
1937
1938int
864dbfa3 1939Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
a0d0e21e 1940{
97aff369 1941 dVAR;
8772537c 1942 SV* const lsv = LvTARG(sv);
a0d0e21e
LW
1943 SSize_t pos;
1944 STRLEN len;
c00206c8 1945 STRLEN ulen = 0;
53d44271 1946 MAGIC* found;
a0d0e21e 1947
7918f24d 1948 PERL_ARGS_ASSERT_MAGIC_SETPOS;
3881461a 1949 PERL_UNUSED_ARG(mg);
ac27b0f5 1950
a0d0e21e 1951 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
3881461a
AL
1952 found = mg_find(lsv, PERL_MAGIC_regex_global);
1953 else
1954 found = NULL;
1955 if (!found) {
a0d0e21e
LW
1956 if (!SvOK(sv))
1957 return 0;
d83f0a82
NC
1958#ifdef PERL_OLD_COPY_ON_WRITE
1959 if (SvIsCOW(lsv))
1960 sv_force_normal_flags(lsv, 0);
1961#endif
3881461a 1962 found = sv_magicext(lsv, NULL, PERL_MAGIC_regex_global, &PL_vtbl_mglob,
53d44271 1963 NULL, 0);
a0d0e21e
LW
1964 }
1965 else if (!SvOK(sv)) {
3881461a 1966 found->mg_len = -1;
a0d0e21e
LW
1967 return 0;
1968 }
1969 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1970
fc15ae8f 1971 pos = SvIV(sv) - CopARYBASE_get(PL_curcop);
a0ed51b3 1972
7e2040f0 1973 if (DO_UTF8(lsv)) {
a0ed51b3
LW
1974 ulen = sv_len_utf8(lsv);
1975 if (ulen)
1976 len = ulen;
a0ed51b3
LW
1977 }
1978
a0d0e21e
LW
1979 if (pos < 0) {
1980 pos += len;
1981 if (pos < 0)
1982 pos = 0;
1983 }
eb160463 1984 else if (pos > (SSize_t)len)
a0d0e21e 1985 pos = len;
a0ed51b3
LW
1986
1987 if (ulen) {
1988 I32 p = pos;
1989 sv_pos_u2b(lsv, &p, 0);
1990 pos = p;
1991 }
727405f8 1992
3881461a
AL
1993 found->mg_len = pos;
1994 found->mg_flags &= ~MGf_MINMATCH;
a0d0e21e 1995
79072805
LW
1996 return 0;
1997}
1998
1999int
864dbfa3 2000Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
6ff81951
GS
2001{
2002 STRLEN len;
35a4481c 2003 SV * const lsv = LvTARG(sv);
b83604b4 2004 const char * const tmps = SvPV_const(lsv,len);
6ff81951
GS
2005 I32 offs = LvTARGOFF(sv);
2006 I32 rem = LvTARGLEN(sv);
7918f24d
NC
2007
2008 PERL_ARGS_ASSERT_MAGIC_GETSUBSTR;
8772537c 2009 PERL_UNUSED_ARG(mg);
6ff81951 2010
9aa983d2
JH
2011 if (SvUTF8(lsv))
2012 sv_pos_u2b(lsv, &offs, &rem);
eb160463 2013 if (offs > (I32)len)
6ff81951 2014 offs = len;
eb160463 2015 if (rem + offs > (I32)len)
6ff81951
GS
2016 rem = len - offs;
2017 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
9aa983d2 2018 if (SvUTF8(lsv))
2ef4b674 2019 SvUTF8_on(sv);
6ff81951
GS
2020 return 0;
2021}
2022
2023int
864dbfa3 2024Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
79072805 2025{
97aff369 2026 dVAR;
9aa983d2 2027 STRLEN len;
5fcbf73d 2028 const char * const tmps = SvPV_const(sv, len);
dd374669 2029 SV * const lsv = LvTARG(sv);
9aa983d2
JH
2030 I32 lvoff = LvTARGOFF(sv);
2031 I32 lvlen = LvTARGLEN(sv);
7918f24d
NC
2032
2033 PERL_ARGS_ASSERT_MAGIC_SETSUBSTR;
8772537c 2034 PERL_UNUSED_ARG(mg);
075a4a2b 2035
1aa99e6b 2036 if (DO_UTF8(sv)) {
9aa983d2
JH
2037 sv_utf8_upgrade(lsv);
2038 sv_pos_u2b(lsv, &lvoff, &lvlen);
2039 sv_insert(lsv, lvoff, lvlen, tmps, len);
b76f3ce2 2040 LvTARGLEN(sv) = sv_len_utf8(sv);
9aa983d2
JH
2041 SvUTF8_on(lsv);
2042 }
9bf12eaf 2043 else if (lsv && SvUTF8(lsv)) {
5fcbf73d 2044 const char *utf8;
9aa983d2 2045 sv_pos_u2b(lsv, &lvoff, &lvlen);
b76f3ce2 2046 LvTARGLEN(sv) = len;
5fcbf73d
AL
2047 utf8 = (char*)bytes_to_utf8((U8*)tmps, &len);
2048 sv_insert(lsv, lvoff, lvlen, utf8, len);
2049 Safefree(utf8);
1aa99e6b 2050 }
b76f3ce2
GB
2051 else {
2052 sv_insert(lsv, lvoff, lvlen, tmps, len);
2053 LvTARGLEN(sv) = len;
2054 }
2055
1aa99e6b 2056
79072805
LW
2057 return 0;
2058}
2059
2060int
864dbfa3 2061Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2062{
97aff369 2063 dVAR;
7918f24d
NC
2064
2065 PERL_ARGS_ASSERT_MAGIC_GETTAINT;
8772537c 2066 PERL_UNUSED_ARG(sv);
7918f24d 2067
27cc343c 2068 TAINT_IF((PL_localizing != 1) && (mg->mg_len & 1));
463ee0b2
LW
2069 return 0;
2070}
2071
2072int
864dbfa3 2073Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
463ee0b2 2074{
97aff369 2075 dVAR;
7918f24d
NC
2076
2077 PERL_ARGS_ASSERT_MAGIC_SETTAINT;
8772537c 2078 PERL_UNUSED_ARG(sv);
7918f24d 2079
b01e650a
DM
2080 /* update taint status */
2081 if (PL_tainted)
2082 mg->mg_len |= 1;
2083 else
2084 mg->mg_len &= ~1;
463ee0b2
LW
2085 return 0;
2086}
2087
2088int
864dbfa3 2089Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
6ff81951 2090{
35a4481c 2091 SV * const lsv = LvTARG(sv);
7918f24d
NC
2092
2093 PERL_ARGS_ASSERT_MAGIC_GETVEC;
8772537c 2094 PERL_UNUSED_ARG(mg);
6ff81951 2095
6136c704
AL
2096 if (lsv)
2097 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
2098 else
0c34ef67 2099 SvOK_off(sv);
6ff81951 2100
6ff81951
GS
2101 return 0;
2102}
2103
2104int
864dbfa3 2105Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
79072805 2106{
7918f24d 2107 PERL_ARGS_ASSERT_MAGIC_SETVEC;
8772537c 2108 PERL_UNUSED_ARG(mg);
79072805
LW
2109 do_vecset(sv); /* XXX slurp this routine */
2110 return 0;
2111}
2112
2113int
864dbfa3 2114Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
5f05dabc 2115{
97aff369 2116 dVAR;
a0714e2c 2117 SV *targ = NULL;
7918f24d
NC
2118
2119 PERL_ARGS_ASSERT_MAGIC_GETDEFELEM;
2120
5f05dabc 2121 if (LvTARGLEN(sv)) {
68dc0745 2122 if (mg->mg_obj) {
8772537c 2123 SV * const ahv = LvTARG(sv);
85fbaab2 2124 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, FALSE, 0);
6d822dc4
MS
2125 if (he)
2126 targ = HeVAL(he);
68dc0745
PP
2127 }
2128 else {
502c6561 2129 AV *const av = MUTABLE_AV(LvTARG(sv));
68dc0745
PP
2130 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
2131 targ = AvARRAY(av)[LvTARGOFF(sv)];
2132 }
46da273f 2133 if (targ && (targ != &PL_sv_undef)) {
68dc0745
PP
2134 /* somebody else defined it for us */
2135 SvREFCNT_dec(LvTARG(sv));
b37c2d43 2136 LvTARG(sv) = SvREFCNT_inc_simple_NN(targ);
68dc0745
PP
2137 LvTARGLEN(sv) = 0;
2138 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2139 mg->mg_obj = NULL;
68dc0745
PP
2140 mg->mg_flags &= ~MGf_REFCOUNTED;
2141 }
5f05dabc 2142 }
71be2cbc
PP
2143 else
2144 targ = LvTARG(sv);
3280af22 2145 sv_setsv(sv, targ ? targ : &PL_sv_undef);
71be2cbc
PP
2146 return 0;
2147}
2148
2149int
864dbfa3 2150Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
71be2cbc 2151{
7918f24d 2152 PERL_ARGS_ASSERT_MAGIC_SETDEFELEM;
8772537c 2153 PERL_UNUSED_ARG(mg);
71be2cbc 2154 if (LvTARGLEN(sv))
68dc0745
PP
2155 vivify_defelem(sv);
2156 if (LvTARG(sv)) {
5f05dabc 2157 sv_setsv(LvTARG(sv), sv);
68dc0745
PP
2158 SvSETMAGIC(LvTARG(sv));
2159 }
5f05dabc
PP
2160 return 0;
2161}
2162
71be2cbc 2163void
864dbfa3 2164Perl_vivify_defelem(pTHX_ SV *sv)
71be2cbc 2165{
97aff369 2166 dVAR;
74e13ce4 2167 MAGIC *mg;
a0714e2c 2168 SV *value = NULL;
71be2cbc 2169
7918f24d
NC
2170 PERL_ARGS_ASSERT_VIVIFY_DEFELEM;
2171
14befaf4 2172 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
71be2cbc 2173 return;
68dc0745 2174 if (mg->mg_obj) {
8772537c 2175 SV * const ahv = LvTARG(sv);
85fbaab2 2176 HE * const he = hv_fetch_ent(MUTABLE_HV(ahv), mg->mg_obj, TRUE, 0);
6d822dc4
MS
2177 if (he)
2178 value = HeVAL(he);
3280af22 2179 if (!value || value == &PL_sv_undef)
be2597df 2180 Perl_croak(aTHX_ PL_no_helem_sv, SVfARG(mg->mg_obj));
71be2cbc 2181 }
68dc0745 2182 else {
502c6561 2183 AV *const av = MUTABLE_AV(LvTARG(sv));
5aabfad6 2184 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
a0714e2c 2185 LvTARG(sv) = NULL; /* array can't be extended */
68dc0745 2186 else {
d4c19fe8 2187 SV* const * const svp = av_fetch(av, LvTARGOFF(sv), TRUE);
3280af22 2188 if (!svp || (value = *svp) == &PL_sv_undef)
cea2e8a9 2189 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
68dc0745
PP
2190 }
2191 }
b37c2d43 2192 SvREFCNT_inc_simple_void(value);
68dc0745
PP
2193 SvREFCNT_dec(LvTARG(sv));
2194 LvTARG(sv) = value;
71be2cbc 2195 LvTARGLEN(sv) = 0;
68dc0745 2196 SvREFCNT_dec(mg->mg_obj);
a0714e2c 2197 mg->mg_obj = NULL;
68dc0745 2198 mg->mg_flags &= ~MGf_REFCOUNTED;
5f05dabc
PP
2199}
2200
2201int
864dbfa3 2202Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
810b8aa5 2203{
7918f24d 2204 PERL_ARGS_ASSERT_MAGIC_KILLBACKREFS;
502c6561 2205 return Perl_sv_kill_backrefs(aTHX_ sv, MUTABLE_AV(mg->mg_obj));
810b8aa5
GS
2206}
2207
2208int
864dbfa3 2209Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
93a17b20 2210{
7918f24d 2211 PERL_ARGS_ASSERT_MAGIC_SETMGLOB;
96a5add6 2212 PERL_UNUSED_CONTEXT;
565764a8 2213 mg->mg_len = -1;
c6496cc7 2214 SvSCREAM_off(sv);
93a17b20
LW
2215 return 0;
2216}
2217
2218int
864dbfa3 2219Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
79072805 2220{
35a4481c 2221 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
79072805 2222
7918f24d
NC
2223 PERL_ARGS_ASSERT_MAGIC_SETUVAR;
2224
79072805 2225 if (uf && uf->uf_set)
24f81a43 2226 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
79072805
LW
2227 return 0;
2228}
2229
c277df42 2230int
faf82a0b
AE
2231Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2232{
488344d2 2233 const char type = mg->mg_type;
7918f24d
NC
2234
2235 PERL_ARGS_ASSERT_MAGIC_SETREGEXP;
2236
488344d2
NC
2237 if (type == PERL_MAGIC_qr) {
2238 } else if (type == PERL_MAGIC_bm) {
2239 SvTAIL_off(sv);
2240 SvVALID_off(sv);
2241 } else {
2242 assert(type == PERL_MAGIC_fm);
2243 SvCOMPILED_off(sv);
2244 }
2245 return sv_unmagic(sv, type);
faf82a0b
AE
2246}
2247
7a4c00b4 2248#ifdef USE_LOCALE_COLLATE
79072805 2249int
864dbfa3 2250Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
bbce6d69 2251{
7918f24d
NC
2252 PERL_ARGS_ASSERT_MAGIC_SETCOLLXFRM;
2253
bbce6d69 2254 /*
838b5b74 2255 * RenE<eacute> Descartes said "I think not."
bbce6d69
PP
2256 * and vanished with a faint plop.
2257 */
96a5add6 2258 PERL_UNUSED_CONTEXT;
8772537c 2259 PERL_UNUSED_ARG(sv);
7a4c00b4
PP
2260 if (mg->mg_ptr) {
2261 Safefree(mg->mg_ptr);
2262 mg->mg_ptr = NULL;
565764a8 2263 mg->mg_len = -1;
7a4c00b4 2264 }
bbce6d69
PP
2265 return 0;
2266}
7a4c00b4 2267#endif /* USE_LOCALE_COLLATE */
bbce6d69 2268
7e8c5dac
HS
2269/* Just clear the UTF-8 cache data. */
2270int
2271Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2272{
7918f24d 2273 PERL_ARGS_ASSERT_MAGIC_SETUTF8;
96a5add6 2274 PERL_UNUSED_CONTEXT;
8772537c 2275 PERL_UNUSED_ARG(sv);
7e8c5dac 2276 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
3881461a 2277 mg->mg_ptr = NULL;
7e8c5dac
HS
2278 mg->mg_len = -1; /* The mg_len holds the len cache. */
2279 return 0;
2280}
2281
bbce6d69 2282int
864dbfa3 2283Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
79072805 2284{
97aff369 2285 dVAR;
e1ec3a88 2286 register const char *s;
2fdbfb4d
AB
2287 register I32 paren;
2288 register const REGEXP * rx;
2289 const char * const remaining = mg->mg_ptr + 1;
79072805 2290 I32 i;
8990e307 2291 STRLEN len;
2fdbfb4d 2292
7918f24d
NC
2293 PERL_ARGS_ASSERT_MAGIC_SET;
2294
79072805 2295 switch (*mg->mg_ptr) {
2fdbfb4d
AB
2296 case '\015': /* $^MATCH */
2297 if (strEQ(remaining, "ATCH"))
2298 goto do_match;
2299 case '`': /* ${^PREMATCH} caught below */
2300 do_prematch:
f1b875a0 2301 paren = RX_BUFF_IDX_PREMATCH;
2fdbfb4d
AB
2302 goto setparen;
2303 case '\'': /* ${^POSTMATCH} caught below */
2304 do_postmatch:
f1b875a0 2305 paren = RX_BUFF_IDX_POSTMATCH;
2fdbfb4d
AB
2306 goto setparen;
2307 case '&':
2308 do_match:
f1b875a0 2309 paren = RX_BUFF_IDX_FULLMATCH;
2fdbfb4d
AB
2310 goto setparen;
2311 case '1': case '2': case '3': case '4':
2312 case '5': case '6': case '7': case '8': case '9':
104a8018 2313 paren = atoi(mg->mg_ptr);
2fdbfb4d 2314 setparen:
1e05feb3 2315 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
2fdbfb4d
AB
2316 CALLREG_NUMBUF_STORE((REGEXP * const)rx,paren,sv);
2317 break;
1e05feb3 2318 } else {
2fdbfb4d
AB
2319 /* Croak with a READONLY error when a numbered match var is
2320 * set without a previous pattern match. Unless it's C<local $1>
2321 */
2322 if (!PL_localizing) {
f1f66076 2323 Perl_croak(aTHX_ "%s", PL_no_modify);
2fdbfb4d
AB
2324 }
2325 }
748a9306 2326 case '\001': /* ^A */
3280af22 2327 sv_setsv(PL_bodytarget, sv);
748a9306 2328 break;
49460fe6 2329 case '\003': /* ^C */
38ab35f8 2330 PL_minus_c = (bool)SvIV(sv);
49460fe6
NIS
2331 break;
2332
79072805 2333 case '\004': /* ^D */
b4ab917c 2334#ifdef DEBUGGING
b83604b4 2335 s = SvPV_nolen_const(sv);
ddcf8bc1 2336 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
79072805 2337 DEBUG_x(dump_all());
b4ab917c 2338#else
38ab35f8 2339 PL_debug = (SvIV(sv)) | DEBUG_TOP_FLAG;
b4ab917c 2340#endif
79072805 2341 break;
28f23441 2342 case '\005': /* ^E */
d0063567 2343 if (*(mg->mg_ptr+1) == '\0') {
e37778c2 2344#ifdef VMS
38ab35f8 2345 set_vaxc_errno(SvIV(sv));
e37778c2
NC
2346#else
2347# ifdef WIN32
d0063567 2348 SetLastError( SvIV(sv) );
e37778c2
NC
2349# else
2350# ifdef OS2
38ab35f8 2351 os2_setsyserrno(SvIV(sv));
e37778c2 2352# else
d0063567 2353 /* will anyone ever use this? */
38ab35f8 2354 SETERRNO(SvIV(sv), 4);
048c1ddf
IZ
2355# endif
2356# endif
22fae026 2357#endif
d0063567
DK
2358 }
2359 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2360 if (PL_encoding)
2361 SvREFCNT_dec(PL_encoding);
2362 if (SvOK(sv) || SvGMAGICAL(sv)) {
2363 PL_encoding = newSVsv(sv);
2364 }
2365 else {
a0714e2c 2366 PL_encoding = NULL;
d0063567
DK
2367 }
2368 }
2369 break;
79072805 2370 case '\006': /* ^F */
38ab35f8 2371 PL_maxsysfd = SvIV(sv);
79072805 2372 break;
a0d0e21e 2373 case '\010': /* ^H */
38ab35f8 2374 PL_hints = SvIV(sv);
a0d0e21e 2375 break;
9d116dd7 2376 case '\011': /* ^I */ /* NOT \t in EBCDIC */
43c5f42d 2377 Safefree(PL_inplace);
bd61b366 2378 PL_inplace = SvOK(sv) ? savesvpv(sv) : NULL;
da78da6e 2379 break;
28f23441 2380 case '\017': /* ^O */
ac27b0f5 2381 if (*(mg->mg_ptr+1) == '\0') {
43c5f42d 2382 Safefree(PL_osname);
bd61b366 2383 PL_osname = NULL;
3511154c
DM
2384 if (SvOK(sv)) {
2385 TAINT_PROPER("assigning to $^O");
2e0de35c 2386 PL_osname = savesvpv(sv);
3511154c 2387 }
ac27b0f5
NIS
2388 }
2389 else if (strEQ(mg->mg_ptr, "\017PEN")) {
8b850bd5
NC
2390 STRLEN len;
2391 const char *const start = SvPV(sv, len);
b54fc2b6 2392 const char *out = (const char*)memchr(start, '\0', len);
8b850bd5
NC
2393 SV *tmp;
2394 struct refcounted_he *tmp_he;
2395
2396
2397 PL_compiling.cop_hints |= HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2398 PL_hints
2399 |= HINT_LOCALIZE_HH | HINT_LEXICAL_IO_IN | HINT_LEXICAL_IO_OUT;
2400
2401 /* Opening for input is more common than opening for output, so
2402 ensure that hints for input are sooner on linked list. */
59cd0e26
NC
2403 tmp = out ? newSVpvn_flags(out + 1, start + len - out - 1,
2404 SVs_TEMP | SvUTF8(sv))
76f68e9b 2405 : newSVpvs_flags("", SVs_TEMP | SvUTF8(sv));
8b850bd5
NC
2406
2407 tmp_he
2408 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
84bafc02
NC
2409 newSVpvs_flags("open>", SVs_TEMP),
2410 tmp);
8b850bd5
NC
2411
2412 /* The UTF-8 setting is carried over */
2413 sv_setpvn(tmp, start, out ? (STRLEN)(out - start) : len);
2414
11bcd5da 2415 PL_compiling.cop_hints_hash
8b850bd5 2416 = Perl_refcounted_he_new(aTHX_ tmp_he,
84bafc02
NC
2417 newSVpvs_flags("open<", SVs_TEMP),
2418 tmp);
ac27b0f5 2419 }
28f23441 2420 break;
79072805 2421 case '\020': /* ^P */
2fdbfb4d
AB
2422 if (*remaining == '\0') { /* ^P */
2423 PL_perldb = SvIV(sv);
2424 if (PL_perldb && !PL_DBsingle)
2425 init_debugger();
2426 break;
2427 } else if (strEQ(remaining, "REMATCH")) { /* $^PREMATCH */
2428 goto do_prematch;
2429 } else if (strEQ(remaining, "OSTMATCH")) { /* $^POSTMATCH */
2430 goto do_postmatch;
2431 }
79072805 2432 case '\024': /* ^T */
88e89b8a 2433#ifdef BIG_TIME
6b88bc9c 2434 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
88e89b8a 2435#else
38ab35f8 2436 PL_basetime = (Time_t)SvIV(sv);
88e89b8a 2437#endif
79072805 2438 break;
e07ea26a
NC
2439 case '\025': /* ^UTF8CACHE */
2440 if (strEQ(mg->mg_ptr+1, "TF8CACHE")) {
2441 PL_utf8cache = (signed char) sv_2iv(sv);
2442 }
2443 break;
fde18df1 2444 case '\027': /* ^W & $^WARNING_BITS */
4438c4b7
JH
2445 if (*(mg->mg_ptr+1) == '\0') {
2446 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
38ab35f8 2447 i = SvIV(sv);
ac27b0f5 2448 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
0453d815 2449 | (i ? G_WARN_ON : G_WARN_OFF) ;
4438c4b7 2450 }
599cee73 2451 }
0a378802 2452 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
4438c4b7 2453 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
d775746e
GS
2454 if (!SvPOK(sv) && PL_localizing) {
2455 sv_setpvn(sv, WARN_NONEstring, WARNsize);
d3a7d8c7 2456 PL_compiling.cop_warnings = pWARN_NONE;
d775746e
GS
2457 break;
2458 }
f4fc7782 2459 {
b5477537 2460 STRLEN len, i;
d3a7d8c7 2461 int accumulate = 0 ;
f4fc7782 2462 int any_fatals = 0 ;
b83604b4 2463 const char * const ptr = SvPV_const(sv, len) ;
f4fc7782
JH
2464 for (i = 0 ; i < len ; ++i) {
2465 accumulate |= ptr[i] ;
2466 any_fatals |= (ptr[i] & 0xAA) ;
2467 }
4243c432
NC
2468 if (!accumulate) {
2469 if (!specialWARN(PL_compiling.cop_warnings))
2470 PerlMemShared_free(PL_compiling.cop_warnings);
2471 PL_compiling.cop_warnings = pWARN_NONE;
2472 }
72dc9ed5
NC
2473 /* Yuck. I can't see how to abstract this: */
2474 else if (isWARN_on(((STRLEN *)SvPV_nolen_const(sv)) - 1,
2475 WARN_ALL) && !any_fatals) {
4243c432
NC
2476 if (!specialWARN(PL_compiling.cop_warnings))
2477 PerlMemShared_free(PL_compiling.cop_warnings);
f4fc7782
JH
2478 PL_compiling.cop_warnings = pWARN_ALL;
2479 PL_dowarn |= G_WARN_ONCE ;
727405f8 2480 }
d3a7d8c7 2481 else {
72dc9ed5
NC
2482 STRLEN len;
2483 const char *const p = SvPV_const(sv, len);
2484
2485 PL_compiling.cop_warnings
8ee4cf24 2486 = Perl_new_warnings_bitfield(aTHX_ PL_compiling.cop_warnings,
72dc9ed5
NC
2487 p, len);
2488
d3a7d8c7
GS
2489 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2490 PL_dowarn |= G_WARN_ONCE ;
2491 }
f4fc7782 2492
d3a7d8c7 2493 }
4438c4b7 2494 }
971a9dd3 2495 }
79072805
LW
2496 break;
2497 case '.':
3280af22
NIS
2498 if (PL_localizing) {
2499 if (PL_localizing == 1)
7766f137 2500 SAVESPTR(PL_last_in_gv);
748a9306 2501 }
3280af22 2502 else if (SvOK(sv) && GvIO(PL_last_in_gv))
632db599 2503 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
79072805
LW
2504 break;
2505 case '^':
3280af22 2506 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
e1ec3a88 2507 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
f776e3cd 2508 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2509 break;
2510 case '~':
3280af22 2511 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
e1ec3a88 2512 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
f776e3cd 2513 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv, GV_ADD, SVt_PVIO);
79072805
LW
2514 break;
2515 case '=':
38ab35f8 2516 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2517 break;
2518 case '-':
38ab35f8 2519 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIV(sv));
3280af22
NIS
2520 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2521 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
79072805
LW
2522 break;
2523 case '%':
38ab35f8 2524 IoPAGE(GvIOp(PL_defoutgv)) = (SvIV(sv));
79072805
LW
2525 break;
2526 case '|':
4b65379b 2527 {
8772537c 2528 IO * const io = GvIOp(PL_defoutgv);
720f287d
AB
2529 if(!io)
2530 break;
38ab35f8 2531 if ((SvIV(sv)) == 0)
4b65379b
CS
2532 IoFLAGS(io) &= ~IOf_FLUSH;
2533 else {
2534 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2535 PerlIO *ofp = IoOFP(io);
2536 if (ofp)
2537 (void)PerlIO_flush(ofp);
2538 IoFLAGS(io) |= IOf_FLUSH;
2539 }
2540 }
79072805
LW
2541 }
2542 break;
79072805 2543 case '/':
3280af22 2544 SvREFCNT_dec(PL_rs);
8bfdd7d9 2545 PL_rs = newSVsv(sv);
79072805
LW
2546 break;
2547 case '\\':
7889fe52
NIS
2548 if (PL_ors_sv)
2549 SvREFCNT_dec(PL_ors_sv);
009c130f 2550 if (SvOK(sv) || SvGMAGICAL(sv)) {
7889fe52 2551 PL_ors_sv = newSVsv(sv);
009c130f 2552 }
e3c19b7b 2553 else {
a0714e2c 2554 PL_ors_sv = NULL;
e3c19b7b 2555 }
79072805 2556 break;
79072805 2557 case '[':
38ab35f8 2558 CopARYBASE_set(&PL_compiling, SvIV(sv));
79072805
LW
2559 break;
2560 case '?':
ff0cee69 2561#ifdef COMPLEX_STATUS
6b88bc9c
GS
2562 if (PL_localizing == 2) {
2563 PL_statusvalue = LvTARGOFF(sv);
2564 PL_statusvalue_vms = LvTARGLEN(sv);
ff0cee69
PP
2565 }
2566 else
2567#endif
2568#ifdef VMSISH_STATUS
2569 if (VMSISH_STATUS)
fb38d079 2570 STATUS_NATIVE_CHILD_SET((U32)SvIV(sv));
ff0cee69
PP
2571 else
2572#endif
38ab35f8 2573 STATUS_UNIX_EXIT_SET(SvIV(sv));
79072805
LW
2574 break;
2575 case '!':
93189314
JH
2576 {
2577#ifdef VMS
2578# define PERL_VMS_BANG vaxc$errno
2579#else
2580# define PERL_VMS_BANG 0
2581#endif
91487cfc 2582 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
93189314
JH
2583 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2584 }
79072805
LW
2585 break;
2586 case '<':
38ab35f8 2587 PL_uid = SvIV(sv);
3280af22
NIS
2588 if (PL_delaymagic) {
2589 PL_delaymagic |= DM_RUID;
79072805
LW
2590 break; /* don't do magic till later */
2591 }
2592#ifdef HAS_SETRUID
b28d0864 2593 (void)setruid((Uid_t)PL_uid);
79072805
LW
2594#else
2595#ifdef HAS_SETREUID
3280af22 2596 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
748a9306 2597#else
85e6fe83 2598#ifdef HAS_SETRESUID
b28d0864 2599 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
79072805 2600#else
75870ed3 2601 if (PL_uid == PL_euid) { /* special case $< = $> */
2602#ifdef PERL_DARWIN
2603 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2604 if (PL_uid != 0 && PerlProc_getuid() == 0)
2605 (void)PerlProc_setuid(0);
2606#endif
b28d0864 2607 (void)PerlProc_setuid(PL_uid);
75870ed3 2608 } else {
d8eceb89 2609 PL_uid = PerlProc_getuid();
cea2e8a9 2610 Perl_croak(aTHX_ "setruid() not implemented");
a0d0e21e 2611 }
79072805
LW
2612#endif
2613#endif
85e6fe83 2614#endif
d8eceb89 2615 PL_uid = PerlProc_getuid();
3280af22 2616 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2617 break;
2618 case '>':
38ab35f8 2619 PL_euid = SvIV(sv);
3280af22
NIS
2620 if (PL_delaymagic) {
2621 PL_delaymagic |= DM_EUID;
79072805
LW
2622 break; /* don't do magic till later */
2623 }
2624#ifdef HAS_SETEUID
3280af22 2625 (void)seteuid((Uid_t)PL_euid);
79072805
LW
2626#else
2627#ifdef HAS_SETREUID
b28d0864 2628 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
85e6fe83
LW
2629#else
2630#ifdef HAS_SETRESUID
6b88bc9c 2631 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
79072805 2632#else
b28d0864
NIS
2633 if (PL_euid == PL_uid) /* special case $> = $< */
2634 PerlProc_setuid(PL_euid);
a0d0e21e 2635 else {
e8ee3774 2636 PL_euid = PerlProc_geteuid();
cea2e8a9 2637 Perl_croak(aTHX_ "seteuid() not implemented");
a0d0e21e 2638 }
79072805
LW
2639#endif
2640#endif
85e6fe83 2641#endif
d8eceb89 2642 PL_euid = PerlProc_geteuid();
3280af22 2643 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2644 break;
2645 case '(':
38ab35f8 2646 PL_gid = SvIV(sv);
3280af22
NIS
2647 if (PL_delaymagic) {
2648 PL_delaymagic |= DM_RGID;
79072805
LW
2649 break; /* don't do magic till later */
2650 }
2651#ifdef HAS_SETRGID
b28d0864 2652 (void)setrgid((Gid_t)PL_gid);
79072805
LW
2653#else
2654#ifdef HAS_SETREGID
3280af22 2655 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
85e6fe83
LW
2656#else
2657#ifdef HAS_SETRESGID
b28d0864 2658 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
79072805 2659#else
b28d0864
NIS
2660 if (PL_gid == PL_egid) /* special case $( = $) */
2661 (void)PerlProc_setgid(PL_gid);
748a9306 2662 else {
d8eceb89 2663 PL_gid = PerlProc_getgid();
cea2e8a9 2664 Perl_croak(aTHX_ "setrgid() not implemented");
748a9306 2665 }
79072805
LW
2666#endif
2667#endif
85e6fe83 2668#endif
d8eceb89 2669 PL_gid = PerlProc_getgid();
3280af22 2670 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2671 break;
2672 case ')':
5cd24f17
PP
2673#ifdef HAS_SETGROUPS
2674 {
b83604b4 2675 const char *p = SvPV_const(sv, len);
757f63d8
SP
2676 Groups_t *gary = NULL;
2677
2678 while (isSPACE(*p))
2679 ++p;
2680 PL_egid = Atol(p);
2681 for (i = 0; i < NGROUPS; ++i) {
2682 while (*p && !isSPACE(*p))
2683 ++p;
2684 while (isSPACE(*p))
2685 ++p;
2686 if (!*p)
2687 break;
2688 if(!gary)
2689 Newx(gary, i + 1, Groups_t);
2690 else
2691 Renew(gary, i + 1, Groups_t);
2692 gary[i] = Atol(p);
2693 }
2694 if (i)
2695 (void)setgroups(i, gary);
f5a63d97 2696 Safefree(gary);
5cd24f17
PP
2697 }
2698#else /* HAS_SETGROUPS */
38ab35f8 2699 PL_egid = SvIV(sv);
5cd24f17 2700#endif /* HAS_SETGROUPS */
3280af22
NIS
2701 if (PL_delaymagic) {
2702 PL_delaymagic |= DM_EGID;
79072805
LW
2703 break; /* don't do magic till later */
2704 }
2705#ifdef HAS_SETEGID
3280af22 2706 (void)setegid((Gid_t)PL_egid);
79072805
LW
2707#else
2708#ifdef HAS_SETREGID
b28d0864 2709 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
85e6fe83
LW
2710#else
2711#ifdef HAS_SETRESGID
b28d0864 2712 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
79072805 2713#else
b28d0864
NIS
2714 if (PL_egid == PL_gid) /* special case $) = $( */
2715 (void)PerlProc_setgid(PL_egid);
748a9306 2716 else {
d8eceb89 2717 PL_egid = PerlProc_getegid();
cea2e8a9 2718 Perl_croak(aTHX_ "setegid() not implemented");
748a9306 2719 }
79072805
LW
2720#endif
2721#endif
85e6fe83 2722#endif
d8eceb89 2723 PL_egid = PerlProc_getegid();
3280af22 2724 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
79072805
LW
2725 break;
2726 case ':':
2d8e6c8d 2727 PL_chopset = SvPV_force(sv,len);
79072805
LW
2728 break;
2729 case '0':
e2975953 2730 LOCK_DOLLARZERO_MUTEX;
4bc88a62
PS
2731#ifdef HAS_SETPROCTITLE
2732 /* The BSDs don't show the argv[] in ps(1) output, they
2733 * show a string from the process struct and provide
2734 * the setproctitle() routine to manipulate that. */
a2722ac9 2735 if (PL_origalen != 1) {
b83604b4 2736 s = SvPV_const(sv, len);
98b76f99 2737# if __FreeBSD_version > 410001
9aad2c0e 2738 /* The leading "-" removes the "perl: " prefix,
4bc88a62
PS
2739 * but not the "(perl) suffix from the ps(1)
2740 * output, because that's what ps(1) shows if the
2741 * argv[] is modified. */
6f2ad931 2742 setproctitle("-%s", s);
9aad2c0e 2743# else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
4bc88a62
PS
2744 /* This doesn't really work if you assume that
2745 * $0 = 'foobar'; will wipe out 'perl' from the $0
2746 * because in ps(1) output the result will be like
2747 * sprintf("perl: %s (perl)", s)
2748 * I guess this is a security feature:
2749 * one (a user process) cannot get rid of the original name.
2750 * --jhi */
2751 setproctitle("%s", s);
2752# endif
2753 }
9d3968b2 2754#elif defined(__hpux) && defined(PSTAT_SETCMD)
a2722ac9 2755 if (PL_origalen != 1) {
17aa7f3d 2756 union pstun un;
b83604b4 2757 s = SvPV_const(sv, len);
6867be6d 2758 un.pst_command = (char *)s;
17aa7f3d
JH
2759 pstat(PSTAT_SETCMD, un, len, 0, 0);
2760 }
9d3968b2 2761#else
2d2af554
GA
2762 if (PL_origalen > 1) {
2763 /* PL_origalen is set in perl_parse(). */
2764 s = SvPV_force(sv,len);
2765 if (len >= (STRLEN)PL_origalen-1) {
2766 /* Longer than original, will be truncated. We assume that
2767 * PL_origalen bytes are available. */
2768 Copy(s, PL_origargv[0], PL_origalen-1, char);
2769 }
2770 else {
2771 /* Shorter than original, will be padded. */
235ac35d 2772#ifdef PERL_DARWIN
60777a0d
JH
2773 /* Special case for Mac OS X: see [perl #38868] */
2774 const int pad = 0;
235ac35d 2775#else
8a89a4f1
MB
2776 /* Is the space counterintuitive? Yes.
2777 * (You were expecting \0?)
2778 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2779 * --jhi */
60777a0d 2780 const int pad = ' ';
235ac35d 2781#endif
60777a0d
JH
2782 Copy(s, PL_origargv[0], len, char);
2783 PL_origargv[0][len] = 0;
2784 memset(PL_origargv[0] + len + 1,
2785 pad, PL_origalen - len - 1);
2d2af554
GA
2786 }
2787 PL_origargv[0][PL_origalen-1] = 0;
2788 for (i = 1; i < PL_origargc; i++)
2789 PL_origargv[i] = 0;
79072805 2790 }
9d3968b2 2791#endif
e2975953 2792 UNLOCK_DOLLARZERO_MUTEX;
79072805
LW
2793 break;
2794 }
2795 return 0;
2796}
2797
2798I32
35a4481c 2799Perl_whichsig(pTHX_ const char *sig)
79072805 2800{
aadb217d 2801 register char* const* sigv;
7918f24d
NC
2802
2803 PERL_ARGS_ASSERT_WHICHSIG;
96a5add6 2804 PERL_UNUSED_CONTEXT;
79072805 2805
aadb217d 2806 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
79072805 2807 if (strEQ(sig,*sigv))
aadb217d 2808 return PL_sig_num[sigv - (char* const*)PL_sig_name];
79072805
LW
2809#ifdef SIGCLD
2810 if (strEQ(sig,"CHLD"))
2811 return SIGCLD;
2812#endif
2813#ifdef SIGCHLD
2814 if (strEQ(sig,"CLD"))
2815 return SIGCHLD;
2816#endif
7f1236c0 2817 return -1;
79072805
LW
2818}
2819
ecfc5424 2820Signal_t
1e82f5a6 2821#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
b6455c53 2822Perl_sighandler(int sig, siginfo_t *sip, void *uap PERL_UNUSED_DECL)
1e82f5a6
SH
2823#else
2824Perl_sighandler(int sig)
2825#endif
79072805 2826{
1018e26f
NIS
2827#ifdef PERL_GET_SIG_CONTEXT
2828 dTHXa(PERL_GET_SIG_CONTEXT);
71d280e3 2829#else
cea2e8a9 2830 dTHX;
71d280e3 2831#endif
79072805 2832 dSP;
a0714e2c
SS
2833 GV *gv = NULL;
2834 SV *sv = NULL;
8772537c 2835 SV * const tSv = PL_Sv;
601f1833 2836 CV *cv = NULL;
533c011a 2837 OP *myop = PL_op;
84902520 2838 U32 flags = 0;
8772537c 2839 XPV * const tXpv = PL_Xpv;
71d280e3 2840
3280af22 2841 if (PL_savestack_ix + 15 <= PL_savestack_max)
84902520 2842 flags |= 1;
3280af22 2843 if (PL_markstack_ptr < PL_markstack_max - 2)
84902520 2844 flags |= 4;
3280af22 2845 if (PL_scopestack_ix < PL_scopestack_max - 3)
84902520
TB
2846 flags |= 16;
2847
727405f8 2848 if (!PL_psig_ptr[sig]) {
99ef548b 2849 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
727405f8
NIS
2850 PL_sig_name[sig]);
2851 exit(sig);
2852 }
ff0cee69 2853
84902520
TB
2854 /* Max number of items pushed there is 3*n or 4. We cannot fix
2855 infinity, so we fix 4 (in fact 5): */
2856 if (flags & 1) {
3280af22 2857 PL_savestack_ix += 5; /* Protect save in progress. */
8772537c 2858 SAVEDESTRUCTOR_X(S_unwind_handler_stack, (void*)&flags);
84902520 2859 }
ac27b0f5 2860 if (flags & 4)
3280af22 2861 PL_markstack_ptr++; /* Protect mark. */
84902520 2862 if (flags & 16)
3280af22 2863 PL_scopestack_ix += 1;
84902520 2864 /* sv_2cv is too complicated, try a simpler variant first: */
ea726b52 2865 if (!SvROK(PL_psig_ptr[sig]) || !(cv = MUTABLE_CV(SvRV(PL_psig_ptr[sig])))
8772537c
AL
2866 || SvTYPE(cv) != SVt_PVCV) {
2867 HV *st;
f2c0649b 2868 cv = sv_2cv(PL_psig_ptr[sig], &st, &gv, GV_ADD);
8772537c 2869 }
84902520 2870
a0d0e21e 2871 if (!cv || !CvROOT(cv)) {
599cee73 2872 if (ckWARN(WARN_SIGNAL))
9014280d 2873 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
22c35a8c 2874 PL_sig_name[sig], (gv ? GvENAME(gv)
00d579c5
GS
2875 : ((cv && CvGV(cv))
2876 ? GvENAME(CvGV(cv))
2877 : "__ANON__")));
2878 goto cleanup;
79072805
LW
2879 }
2880
22c35a8c 2881 if(PL_psig_name[sig]) {
b37c2d43 2882 sv = SvREFCNT_inc_NN(PL_psig_name[sig]);
84902520 2883 flags |= 64;
df3728a2 2884#if !defined(PERL_IMPLICIT_CONTEXT)
27da23d5 2885 PL_sig_sv = sv;
df3728a2 2886#endif
84902520 2887 } else {
ff0cee69 2888 sv = sv_newmortal();
22c35a8c 2889 sv_setpv(sv,PL_sig_name[sig]);
88e89b8a 2890 }
e336de0d 2891
e788e7d3 2892 PUSHSTACKi(PERLSI_SIGNAL);
924508f0 2893 PUSHMARK(SP);
79072805 2894 PUSHs(sv);
8aad04aa
JH
2895#if defined(HAS_SIGACTION) && defined(SA_SIGINFO)
2896 {
2897 struct sigaction oact;
2898
2899 if (sigaction(sig, 0, &oact) == 0 && oact.sa_flags & SA_SIGINFO) {
8aad04aa
JH
2900 if (sip) {
2901 HV *sih = newHV();
ad64d0ec 2902 SV *rv = newRV_noinc(MUTABLE_SV(sih));
8aad04aa
JH
2903 /* The siginfo fields signo, code, errno, pid, uid,
2904 * addr, status, and band are defined by POSIX/SUSv3. */
85771703
NC
2905 (void)hv_stores(sih, "signo", newSViv(sip->si_signo));
2906 (void)hv_stores(sih, "code", newSViv(sip->si_code));
79dec0f4 2907#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
2908 hv_stores(sih, "errno", newSViv(sip->si_errno));
2909 hv_stores(sih, "status", newSViv(sip->si_status));
2910 hv_stores(sih, "uid", newSViv(sip->si_uid));
2911 hv_stores(sih, "pid", newSViv(sip->si_pid));
2912 hv_stores(sih, "addr", newSVuv(PTR2UV(sip->si_addr)));
2913 hv_stores(sih, "band", newSViv(sip->si_band));
79dec0f4 2914#endif
8aad04aa 2915 EXTEND(SP, 2);
ad64d0ec 2916 PUSHs(rv);
22f1178f 2917 mPUSHp((char *)sip, sizeof(*sip));
8aad04aa 2918 }
b4552a27 2919
8aad04aa
JH
2920 }
2921 }
2922#endif
79072805 2923 PUTBACK;
a0d0e21e 2924
ad64d0ec 2925 call_sv(MUTABLE_SV(cv), G_DISCARD|G_EVAL);
79072805 2926
d3acc0f7 2927 POPSTACK;
1b266415 2928 if (SvTRUE(ERRSV)) {
1d615522 2929#ifndef PERL_MICRO
983dbef6 2930#ifdef HAS_SIGPROCMASK
1b266415
NIS
2931 /* Handler "died", for example to get out of a restart-able read().
2932 * Before we re-do that on its behalf re-enable the signal which was
2933 * blocked by the system when we entered.
2934 */
2935 sigset_t set;
2936 sigemptyset(&set);
2937 sigaddset(&set,sig);
2938 sigprocmask(SIG_UNBLOCK, &set, NULL);
2939#else
2940 /* Not clear if this will work */
2941 (void)rsignal(sig, SIG_IGN);
5c1546dc 2942 (void)rsignal(sig, PL_csighandlerp);
1b266415 2943#endif
1d615522 2944#endif /* !PERL_MICRO */
bd61b366 2945 Perl_die(aTHX_ NULL);
1b266415 2946 }
00d579c5 2947cleanup:
84902520 2948 if (flags & 1)
3280af22 2949 PL_savestack_ix -= 8; /* Unprotect save in progress. */
ac27b0f5 2950 if (flags & 4)
3280af22 2951 PL_markstack_ptr--;
84902520 2952 if (flags & 16)
3280af22 2953 PL_scopestack_ix -= 1;
84902520
TB
2954 if (flags & 64)
2955 SvREFCNT_dec(sv);
533c011a 2956 PL_op = myop; /* Apparently not needed... */
ac27b0f5 2957
3280af22
NIS
2958 PL_Sv = tSv; /* Restore global temporaries. */
2959 PL_Xpv = tXpv;
53bb94e2 2960 return;
79072805 2961}
4e35701f
NIS
2962
2963
51371543 2964static void
8772537c 2965S_restore_magic(pTHX_ const void *p)
51371543 2966{
97aff369 2967 dVAR;
8772537c
AL
2968 MGS* const mgs = SSPTR(PTR2IV(p), MGS*);
2969 SV* const sv = mgs->mgs_sv;
51371543
GS
2970
2971 if (!sv)
2972 return;
2973
2974 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
2975 {
f8c7b90f 2976#ifdef PERL_OLD_COPY_ON_WRITE
f9701176
NC
2977 /* While magic was saved (and off) sv_setsv may well have seen
2978 this SV as a prime candidate for COW. */
2979 if (SvIsCOW(sv))
e424a81e 2980 sv_force_normal_flags(sv, 0);
f9701176
NC
2981#endif
2982
51371543
GS
2983 if (mgs->mgs_flags)
2984 SvFLAGS(sv) |= mgs->mgs_flags;
2985 else
2986 mg_magical(sv);
2b77b520
YST
2987 if (SvGMAGICAL(sv)) {
2988 /* downgrade public flags to private,
2989 and discard any other private flags */
2990
10edeb5d
JH
2991 const U32 pubflags = SvFLAGS(sv) & (SVf_IOK|SVf_NOK|SVf_POK);
2992 if (pubflags) {
2993 SvFLAGS(sv) &= ~( pubflags | (SVp_IOK|SVp_NOK|SVp_POK) );
2994 SvFLAGS(sv) |= ( pubflags << PRIVSHIFT );
2b77b520
YST
2995 }
2996 }
51371543
GS
2997 }
2998
2999 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
3000
3001 /* If we're still on top of the stack, pop us off. (That condition
3002 * will be satisfied if restore_magic was called explicitly, but *not*
3003 * if it's being called via leave_scope.)
3004 * The reason for doing this is that otherwise, things like sv_2cv()
3005 * may leave alloc gunk on the savestack, and some code
3006 * (e.g. sighandler) doesn't expect that...
3007 */
3008 if (PL_savestack_ix == mgs->mgs_ss_ix)
3009 {
3010 I32 popval = SSPOPINT;
c76ac1ee 3011 assert(popval == SAVEt_DESTRUCTOR_X);
51371543
GS
3012 PL_savestack_ix -= 2;
3013 popval = SSPOPINT;
3014 assert(popval == SAVEt_ALLOC);
3015 popval = SSPOPINT;
3016 PL_savestack_ix -= popval;
3017 }
3018
3019}
3020
3021static void
8772537c 3022S_unwind_handler_stack(pTHX_ const void *p)
51371543 3023{
27da23d5 3024 dVAR;
e1ec3a88 3025 const U32 flags = *(const U32*)p;
51371543 3026
7918f24d
NC
3027 PERL_ARGS_ASSERT_UNWIND_HANDLER_STACK;
3028
51371543
GS
3029 if (flags & 1)
3030 PL_savestack_ix -= 5; /* Unprotect save in progress. */
df3728a2 3031#if !defined(PERL_IMPLICIT_CONTEXT)
51371543 3032 if (flags & 64)
27da23d5 3033 SvREFCNT_dec(PL_sig_sv);
df3728a2 3034#endif
51371543 3035}
1018e26f 3036
66610fdd 3037/*
b3ca2e83
NC
3038=for apidoc magic_sethint
3039
3040Triggered by a store to %^H, records the key/value pair to
c28fe1ec
NC
3041C<PL_compiling.cop_hints_hash>. It is assumed that hints aren't storing
3042anything that would need a deep copy. Maybe we should warn if we find a
3043reference.
b3ca2e83
NC
3044
3045=cut
3046*/
3047int
3048Perl_magic_sethint(pTHX_ SV *sv, MAGIC *mg)
3049{
3050 dVAR;
ad64d0ec 3051 SV *key = (mg->mg_len == HEf_SVKEY) ? MUTABLE_SV(mg->mg_ptr)
59cd0e26 3052 : newSVpvn_flags(mg->mg_ptr, mg->mg_len, SVs_TEMP);
b3ca2e83 3053
7918f24d
NC
3054 PERL_ARGS_ASSERT_MAGIC_SETHINT;
3055
e6e3e454
NC
3056 /* mg->mg_obj isn't being used. If needed, it would be possible to store
3057 an alternative leaf in there, with PL_compiling.cop_hints being used if
3058 it's NULL. If needed for threads, the alternative could lock a mutex,
3059 or take other more complex action. */
3060
5b9c0671
NC
3061 /* Something changed in %^H, so it will need to be restored on scope exit.
3062 Doing this here saves a lot of doing it manually in perl code (and
3063 forgetting to do it, and consequent subtle errors. */
3064 PL_hints |= HINT_LOCALIZE_HH;
c28fe1ec 3065 PL_compiling.cop_hints_hash
fc92a12d 3066 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash, key, sv);
b3ca2e83
NC
3067 return 0;
3068}
3069
3070/*
f175cff5 3071=for apidoc magic_clearhint
b3ca2e83 3072
c28fe1ec
NC
3073Triggered by a delete from %^H, records the key to
3074C<PL_compiling.cop_hints_hash>.
b3ca2e83
NC
3075
3076=cut
3077*/
3078int
3079Perl_magic_clearhint(pTHX_ SV *sv, MAGIC *mg)
3080{
3081 dVAR;
7918f24d
NC
3082
3083 PERL_ARGS_ASSERT_MAGIC_CLEARHINT;
f5a63d97
AL
3084 PERL_UNUSED_ARG(sv);
3085
b3ca2e83
NC
3086 assert(mg->mg_len == HEf_SVKEY);
3087
b3f24c00
MHM
3088 PERL_UNUSED_ARG(sv);
3089
5b9c0671 3090 PL_hints |= HINT_LOCALIZE_HH;
c28fe1ec
NC
3091 PL_compiling.cop_hints_hash
3092 = Perl_refcounted_he_new(aTHX_ PL_compiling.cop_hints_hash,
ad64d0ec 3093 MUTABLE_SV(mg->mg_ptr), &PL_sv_placeholder);
b3ca2e83
NC
3094 return 0;
3095}
3096
3097/*
66610fdd
RGS
3098 * Local variables:
3099 * c-indentation-style: bsd
3100 * c-basic-offset: 4
3101 * indent-tabs-mode: t
3102 * End:
3103 *
37442d52
RGS
3104 * ex: set ts=8 sts=4 sw=4 noet:
3105 */