3 * Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
4 * 2000, 2001, 2002, 2003, 2004, 2005 by Larry Wall and others
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.
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."
17 =head1 Magical Functions
19 "Magic" is special data attached to SV structures in order to give them
20 "magical" properties. When any Perl code tries to read from, or assign to,
21 an SV marked as magical, it calls the 'get' or 'set' function associated
22 with that SV's magic. A get is called prior to reading an SV, in order to
23 give it a chance to update its internal value (get on $. writes the line
24 number of the last read filehandle into to the SV's IV slot), while
25 set is called after an SV has been written to, in order to allow it to make
26 use of its changed value (set on $/ copies the SV's new value to the
27 PL_rs global variable).
29 Magic is implemented as a linked list of MAGIC structures attached to the
30 SV. Each MAGIC struct holds the type of the magic, a pointer to an array
31 of functions that implement the get(), set(), length() etc functions,
32 plus space for some flags and pointers. For example, a tied variable has
33 a MAGIC structure that contains a pointer to the object associated with the
42 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
52 # include <sys/pstat.h>
55 Signal_t Perl_csighandler(int sig);
57 static void restore_magic(pTHX_ const void *p);
58 static void unwind_handler_stack(pTHX_ const void *p);
61 /* Missing protos on LynxOS */
62 void setruid(uid_t id);
63 void seteuid(uid_t id);
64 void setrgid(uid_t id);
65 void setegid(uid_t id);
69 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
77 /* MGS is typedef'ed to struct magic_state in perl.h */
80 S_save_magic(pTHX_ I32 mgs_ix, SV *sv)
83 assert(SvMAGICAL(sv));
84 #ifdef PERL_OLD_COPY_ON_WRITE
85 /* Turning READONLY off for a copy-on-write scalar is a bad idea. */
90 SAVEDESTRUCTOR_X(restore_magic, INT2PTR(void*, (IV)mgs_ix));
92 mgs = SSPTR(mgs_ix, MGS*);
94 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
95 mgs->mgs_ss_ix = PL_savestack_ix; /* points after the saved destructor */
99 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_NOK|SVp_POK)) >> PRIVSHIFT;
103 =for apidoc mg_magical
105 Turns on the magical status of an SV. See C<sv_magic>.
111 Perl_mg_magical(pTHX_ SV *sv)
114 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
115 const MGVTBL* const vtbl = mg->mg_virtual;
117 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
121 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)) || vtbl->svt_clear)
130 Do magic after a value is retrieved from the SV. See C<sv_magic>.
136 Perl_mg_get(pTHX_ SV *sv)
138 const I32 mgs_ix = SSNEW(sizeof(MGS));
139 const bool was_temp = (bool)SvTEMP(sv);
141 MAGIC *newmg, *head, *cur, *mg;
142 /* guard against sv having being freed midway by holding a private
145 /* sv_2mortal has this side effect of turning on the TEMP flag, which can
146 cause the SV's buffer to get stolen (and maybe other stuff).
149 sv_2mortal(SvREFCNT_inc(sv));
154 save_magic(mgs_ix, sv);
156 /* We must call svt_get(sv, mg) for each valid entry in the linked
157 list of magic. svt_get() may delete the current entry, add new
158 magic to the head of the list, or upgrade the SV. AMS 20010810 */
160 newmg = cur = head = mg = SvMAGIC(sv);
162 const MGVTBL * const vtbl = mg->mg_virtual;
164 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
165 CALL_FPTR(vtbl->svt_get)(aTHX_ sv, mg);
167 /* guard against magic having been deleted - eg FETCH calling
172 /* Don't restore the flags for this entry if it was deleted. */
173 if (mg->mg_flags & MGf_GSKIP)
174 (SSPTR(mgs_ix, MGS *))->mgs_flags = 0;
177 mg = mg->mg_moremagic;
180 /* Have we finished with the new entries we saw? Start again
181 where we left off (unless there are more new entries). */
189 /* Were any new entries added? */
190 if (!have_new && (newmg = SvMAGIC(sv)) != head) {
197 restore_magic(aTHX_ INT2PTR(void *, (IV)mgs_ix));
199 if (SvREFCNT(sv) == 1) {
200 /* We hold the last reference to this SV, which implies that the
201 SV was deleted as a side effect of the routines we called. */
210 Do magic after a value is assigned to the SV. See C<sv_magic>.
216 Perl_mg_set(pTHX_ SV *sv)
218 const I32 mgs_ix = SSNEW(sizeof(MGS));
222 save_magic(mgs_ix, sv);
224 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
225 const MGVTBL* vtbl = mg->mg_virtual;
226 nextmg = mg->mg_moremagic; /* it may delete itself */
227 if (mg->mg_flags & MGf_GSKIP) {
228 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
229 (SSPTR(mgs_ix, MGS*))->mgs_flags = 0;
231 if (vtbl && vtbl->svt_set)
232 CALL_FPTR(vtbl->svt_set)(aTHX_ sv, mg);
235 restore_magic(aTHX_ INT2PTR(void*, (IV)mgs_ix));
240 =for apidoc mg_length
242 Report on the SV's length. See C<sv_magic>.
248 Perl_mg_length(pTHX_ SV *sv)
253 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
254 const MGVTBL * const vtbl = mg->mg_virtual;
255 if (vtbl && vtbl->svt_len) {
256 const I32 mgs_ix = SSNEW(sizeof(MGS));
257 save_magic(mgs_ix, sv);
258 /* omit MGf_GSKIP -- not changed here */
259 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
260 restore_magic(aTHX_ INT2PTR(void*, (IV)mgs_ix));
266 const U8 *s = (U8*)SvPV_const(sv, len);
267 len = Perl_utf8_length(aTHX_ s, s + len);
270 (void)SvPV_const(sv, len);
275 Perl_mg_size(pTHX_ SV *sv)
279 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
280 const MGVTBL* const vtbl = mg->mg_virtual;
281 if (vtbl && vtbl->svt_len) {
282 const I32 mgs_ix = SSNEW(sizeof(MGS));
284 save_magic(mgs_ix, sv);
285 /* omit MGf_GSKIP -- not changed here */
286 len = CALL_FPTR(vtbl->svt_len)(aTHX_ sv, mg);
287 restore_magic(aTHX_ INT2PTR(void*, (IV)mgs_ix));
294 return AvFILLp((AV *) sv); /* Fallback to non-tied array */
298 Perl_croak(aTHX_ "Size magic not implemented");
307 Clear something magical that the SV represents. See C<sv_magic>.
313 Perl_mg_clear(pTHX_ SV *sv)
315 const I32 mgs_ix = SSNEW(sizeof(MGS));
318 save_magic(mgs_ix, sv);
320 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
321 const MGVTBL* const vtbl = mg->mg_virtual;
322 /* omit GSKIP -- never set here */
324 if (vtbl && vtbl->svt_clear)
325 CALL_FPTR(vtbl->svt_clear)(aTHX_ sv, mg);
328 restore_magic(aTHX_ INT2PTR(void*, (IV)mgs_ix));
335 Finds the magic pointer for type matching the SV. See C<sv_magic>.
341 Perl_mg_find(pTHX_ const SV *sv, int type)
345 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
346 if (mg->mg_type == type)
356 Copies the magic from one SV to another. See C<sv_magic>.
362 Perl_mg_copy(pTHX_ SV *sv, SV *nsv, const char *key, I32 klen)
366 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
367 const MGVTBL* const vtbl = mg->mg_virtual;
368 if ((mg->mg_flags & MGf_COPY) && vtbl->svt_copy){
369 count += CALL_FPTR(vtbl->svt_copy)(aTHX_ sv, mg, nsv, key, klen);
371 else if (isUPPER(mg->mg_type)) {
373 mg->mg_type == PERL_MAGIC_tied ? SvTIED_obj(sv, mg) :
374 (mg->mg_type == PERL_MAGIC_regdata && mg->mg_obj)
376 toLOWER(mg->mg_type), key, klen);
386 Free any magic storage used by the SV. See C<sv_magic>.
392 Perl_mg_free(pTHX_ SV *sv)
396 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
397 const MGVTBL* const vtbl = mg->mg_virtual;
398 moremagic = mg->mg_moremagic;
399 if (vtbl && vtbl->svt_free)
400 CALL_FPTR(vtbl->svt_free)(aTHX_ sv, mg);
401 if (mg->mg_ptr && mg->mg_type != PERL_MAGIC_regex_global) {
402 if (mg->mg_len > 0 || mg->mg_type == PERL_MAGIC_utf8)
403 Safefree(mg->mg_ptr);
404 else if (mg->mg_len == HEf_SVKEY)
405 SvREFCNT_dec((SV*)mg->mg_ptr);
407 if (mg->mg_flags & MGf_REFCOUNTED)
408 SvREFCNT_dec(mg->mg_obj);
411 SvMAGIC_set(sv, NULL);
418 Perl_magic_regdata_cnt(pTHX_ SV *sv, MAGIC *mg)
420 register const REGEXP *rx;
423 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
424 if (mg->mg_obj) /* @+ */
427 return rx->lastparen;
434 Perl_magic_regdatum_get(pTHX_ SV *sv, MAGIC *mg)
438 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
439 register const I32 paren = mg->mg_len;
444 if (paren <= (I32)rx->nparens &&
445 (s = rx->startp[paren]) != -1 &&
446 (t = rx->endp[paren]) != -1)
449 if (mg->mg_obj) /* @+ */
454 if (i > 0 && RX_MATCH_UTF8(rx)) {
455 char *b = rx->subbeg;
457 i = Perl_utf8_length(aTHX_ (U8*)b, (U8*)(b+i));
467 Perl_magic_regdatum_set(pTHX_ SV *sv, MAGIC *mg)
470 Perl_croak(aTHX_ PL_no_modify);
471 NORETURN_FUNCTION_END;
475 Perl_magic_len(pTHX_ SV *sv, MAGIC *mg)
479 register const REGEXP *rx;
482 switch (*mg->mg_ptr) {
483 case '1': case '2': case '3': case '4':
484 case '5': case '6': case '7': case '8': case '9': case '&':
485 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
487 paren = atoi(mg->mg_ptr); /* $& is in [0] */
489 if (paren <= (I32)rx->nparens &&
490 (s1 = rx->startp[paren]) != -1 &&
491 (t1 = rx->endp[paren]) != -1)
495 if (i > 0 && RX_MATCH_UTF8(rx)) {
496 const char * const s = rx->subbeg + s1;
501 if (is_utf8_string_loclen((U8*)s, i, &ep, &el))
505 Perl_croak(aTHX_ "panic: magic_len: %"IVdf, (IV)i);
509 if (ckWARN(WARN_UNINITIALIZED))
514 if (ckWARN(WARN_UNINITIALIZED))
519 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
520 paren = rx->lastparen;
525 case '\016': /* ^N */
526 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
527 paren = rx->lastcloseparen;
533 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
534 if (rx->startp[0] != -1) {
545 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
546 if (rx->endp[0] != -1) {
547 i = rx->sublen - rx->endp[0];
558 if (!SvPOK(sv) && SvNIOK(sv)) {
567 Perl_magic_get(pTHX_ SV *sv, MAGIC *mg)
571 register char *s = NULL;
575 switch (*mg->mg_ptr) {
576 case '\001': /* ^A */
577 sv_setsv(sv, PL_bodytarget);
579 case '\003': /* ^C, ^CHILD_ERROR_NATIVE */
580 if (*(mg->mg_ptr+1) == '\0') {
581 sv_setiv(sv, (IV)PL_minus_c);
583 else if (strEQ(mg->mg_ptr, "\003HILD_ERROR_NATIVE")) {
584 sv_setiv(sv, (IV)STATUS_NATIVE);
588 case '\004': /* ^D */
589 sv_setiv(sv, (IV)(PL_debug & DEBUG_MASK));
591 case '\005': /* ^E */
592 if (*(mg->mg_ptr+1) == '\0') {
593 #ifdef MACOS_TRADITIONAL
597 sv_setnv(sv,(double)gMacPerl_OSErr);
598 sv_setpv(sv, gMacPerl_OSErr ? GetSysErrText(gMacPerl_OSErr, msg) : "");
603 # include <descrip.h>
604 # include <starlet.h>
606 $DESCRIPTOR(msgdsc,msg);
607 sv_setnv(sv,(NV) vaxc$errno);
608 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
609 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
615 if (!(_emx_env & 0x200)) { /* Under DOS */
616 sv_setnv(sv, (NV)errno);
617 sv_setpv(sv, errno ? Strerror(errno) : "");
619 if (errno != errno_isOS2) {
620 int tmp = _syserrno();
621 if (tmp) /* 2nd call to _syserrno() makes it 0 */
624 sv_setnv(sv, (NV)Perl_rc);
625 sv_setpv(sv, os2error(Perl_rc));
630 DWORD dwErr = GetLastError();
631 sv_setnv(sv, (NV)dwErr);
634 PerlProc_GetOSError(sv, dwErr);
637 sv_setpvn(sv, "", 0);
642 int saveerrno = errno;
643 sv_setnv(sv, (NV)errno);
644 sv_setpv(sv, errno ? Strerror(errno) : "");
651 SvNOK_on(sv); /* what a wonderful hack! */
653 else if (strEQ(mg->mg_ptr+1, "NCODING"))
654 sv_setsv(sv, PL_encoding);
656 case '\006': /* ^F */
657 sv_setiv(sv, (IV)PL_maxsysfd);
659 case '\010': /* ^H */
660 sv_setiv(sv, (IV)PL_hints);
662 case '\011': /* ^I */ /* NOT \t in EBCDIC */
664 sv_setpv(sv, PL_inplace);
666 sv_setsv(sv, &PL_sv_undef);
668 case '\017': /* ^O & ^OPEN */
669 if (*(mg->mg_ptr+1) == '\0') {
670 sv_setpv(sv, PL_osname);
673 else if (strEQ(mg->mg_ptr, "\017PEN")) {
674 if (!PL_compiling.cop_io)
675 sv_setsv(sv, &PL_sv_undef);
677 sv_setsv(sv, PL_compiling.cop_io);
681 case '\020': /* ^P */
682 sv_setiv(sv, (IV)PL_perldb);
684 case '\023': /* ^S */
685 if (*(mg->mg_ptr+1) == '\0') {
686 if (PL_lex_state != LEX_NOTPARSING)
689 sv_setiv(sv, PL_in_eval & ~(EVAL_INREQUIRE));
694 case '\024': /* ^T */
695 if (*(mg->mg_ptr+1) == '\0') {
697 sv_setnv(sv, PL_basetime);
699 sv_setiv(sv, (IV)PL_basetime);
702 else if (strEQ(mg->mg_ptr, "\024AINT"))
703 sv_setiv(sv, PL_tainting
704 ? (PL_taint_warn || PL_unsafe ? -1 : 1)
707 case '\025': /* $^UNICODE, $^UTF8LOCALE */
708 if (strEQ(mg->mg_ptr, "\025NICODE"))
709 sv_setuv(sv, (UV) PL_unicode);
710 else if (strEQ(mg->mg_ptr, "\025TF8LOCALE"))
711 sv_setuv(sv, (UV) PL_utf8locale);
713 case '\027': /* ^W & $^WARNING_BITS */
714 if (*(mg->mg_ptr+1) == '\0')
715 sv_setiv(sv, (IV)((PL_dowarn & G_WARN_ON) ? TRUE : FALSE));
716 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
717 if (PL_compiling.cop_warnings == pWARN_NONE ||
718 PL_compiling.cop_warnings == pWARN_STD)
720 sv_setpvn(sv, WARN_NONEstring, WARNsize) ;
722 else if (PL_compiling.cop_warnings == pWARN_ALL) {
723 /* Get the bit mask for $warnings::Bits{all}, because
724 * it could have been extended by warnings::register */
726 HV *bits=get_hv("warnings::Bits", FALSE);
727 if (bits && (bits_all=hv_fetch(bits, "all", 3, FALSE))) {
728 sv_setsv(sv, *bits_all);
731 sv_setpvn(sv, WARN_ALLstring, WARNsize) ;
735 sv_setsv(sv, PL_compiling.cop_warnings);
740 case '1': case '2': case '3': case '4':
741 case '5': case '6': case '7': case '8': case '9': case '&':
742 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
746 * Pre-threads, this was paren = atoi(GvENAME((GV*)mg->mg_obj));
747 * XXX Does the new way break anything?
749 paren = atoi(mg->mg_ptr); /* $& is in [0] */
751 if (paren <= (I32)rx->nparens &&
752 (s1 = rx->startp[paren]) != -1 &&
753 (t1 = rx->endp[paren]) != -1)
763 if (RX_MATCH_UTF8(rx) && is_utf8_string((U8*)s, i))
768 if (RX_MATCH_TAINTED(rx)) {
769 MAGIC* mg = SvMAGIC(sv);
772 SvMAGIC_set(sv, mg->mg_moremagic);
774 if ((mgt = SvMAGIC(sv))) {
775 mg->mg_moremagic = mgt;
785 sv_setsv(sv,&PL_sv_undef);
788 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
789 paren = rx->lastparen;
793 sv_setsv(sv,&PL_sv_undef);
795 case '\016': /* ^N */
796 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
797 paren = rx->lastcloseparen;
801 sv_setsv(sv,&PL_sv_undef);
804 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
805 if ((s = rx->subbeg) && rx->startp[0] != -1) {
810 sv_setsv(sv,&PL_sv_undef);
813 if (PL_curpm && (rx = PM_GETRE(PL_curpm))) {
814 if (rx->subbeg && rx->endp[0] != -1) {
815 s = rx->subbeg + rx->endp[0];
816 i = rx->sublen - rx->endp[0];
820 sv_setsv(sv,&PL_sv_undef);
823 if (GvIO(PL_last_in_gv)) {
824 sv_setiv(sv, (IV)IoLINES(GvIOp(PL_last_in_gv)));
829 sv_setiv(sv, (IV)STATUS_CURRENT);
830 #ifdef COMPLEX_STATUS
831 LvTARGOFF(sv) = PL_statusvalue;
832 LvTARGLEN(sv) = PL_statusvalue_vms;
837 if (GvIOp(PL_defoutgv))
838 s = IoTOP_NAME(GvIOp(PL_defoutgv));
842 sv_setpv(sv,GvENAME(PL_defoutgv));
847 if (GvIOp(PL_defoutgv))
848 s = IoFMT_NAME(GvIOp(PL_defoutgv));
850 s = GvENAME(PL_defoutgv);
854 if (GvIOp(PL_defoutgv))
855 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(PL_defoutgv)));
858 if (GvIOp(PL_defoutgv))
859 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(PL_defoutgv)));
862 if (GvIOp(PL_defoutgv))
863 sv_setiv(sv, (IV)IoPAGE(GvIOp(PL_defoutgv)));
870 WITH_THR(sv_setiv(sv, (IV)PL_curcop->cop_arybase));
873 if (GvIOp(PL_defoutgv))
874 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(PL_defoutgv)) & IOf_FLUSH) != 0 );
880 sv_copypv(sv, PL_ors_sv);
883 sv_setpv(sv,PL_ofmt);
887 sv_setnv(sv, (NV)((errno == EVMSERR) ? vaxc$errno : errno));
888 sv_setpv(sv, errno ? Strerror(errno) : "");
891 int saveerrno = errno;
892 sv_setnv(sv, (NV)errno);
894 if (errno == errno_isOS2 || errno == errno_isOS2_set)
895 sv_setpv(sv, os2error(Perl_rc));
898 sv_setpv(sv, errno ? Strerror(errno) : "");
902 SvNOK_on(sv); /* what a wonderful hack! */
905 sv_setiv(sv, (IV)PL_uid);
908 sv_setiv(sv, (IV)PL_euid);
911 sv_setiv(sv, (IV)PL_gid);
913 Perl_sv_setpvf(aTHX_ sv, "%"Gid_t_f, (long unsigned int)PL_gid);
917 sv_setiv(sv, (IV)PL_egid);
919 Perl_sv_setpvf(aTHX_ sv, "%"Gid_t_f, (long unsigned int)PL_egid);
924 Groups_t gary[NGROUPS];
925 I32 j = getgroups(NGROUPS,gary);
927 Perl_sv_catpvf(aTHX_ sv, " %"Gid_t_f, (long unsigned int)gary[j]);
930 (void)SvIOK_on(sv); /* what a wonderful hack! */
932 #ifndef MACOS_TRADITIONAL
941 Perl_magic_getuvar(pTHX_ SV *sv, MAGIC *mg)
943 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
945 if (uf && uf->uf_val)
946 (*uf->uf_val)(aTHX_ uf->uf_index, sv);
951 Perl_magic_setenv(pTHX_ SV *sv, MAGIC *mg)
958 s = SvPV_const(sv,len);
959 ptr = MgPV_const(mg,klen);
962 #ifdef DYNAMIC_ENV_FETCH
963 /* We just undefd an environment var. Is a replacement */
964 /* waiting in the wings? */
967 if ((valp = hv_fetch(GvHVn(PL_envgv), ptr, klen, FALSE)))
968 s = SvPV_const(*valp, len);
972 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32) && !defined(MSDOS)
973 /* And you'll never guess what the dog had */
974 /* in its mouth... */
976 MgTAINTEDDIR_off(mg);
978 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
979 char pathbuf[256], eltbuf[256], *cp, *elt = s;
983 do { /* DCL$PATH may be a search list */
984 while (1) { /* as may dev portion of any element */
985 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
986 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
987 cando_by_name(S_IWUSR,0,elt) ) {
992 if ((cp = strchr(elt, ':')) != Nullch)
994 if (my_trnlnm(elt, eltbuf, j++))
1000 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
1003 if (s && klen == 4 && strEQ(ptr,"PATH")) {
1004 const char *strend = s + len;
1006 while (s < strend) {
1010 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
1011 s, strend, ':', &i);
1013 if (i >= sizeof tmpbuf /* too long -- assume the worst */
1015 || (PerlLIO_stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
1016 MgTAINTEDDIR_on(mg);
1022 #endif /* neither OS2 nor AMIGAOS nor WIN32 nor MSDOS */
1028 Perl_magic_clearenv(pTHX_ SV *sv, MAGIC *mg)
1031 my_setenv(MgPV_nolen_const(mg),Nullch);
1036 Perl_magic_set_all_env(pTHX_ SV *sv, MAGIC *mg)
1038 #if defined(VMS) || defined(EPOC) || defined(SYMBIAN)
1039 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1041 if (PL_localizing) {
1043 magic_clear_all_env(sv,mg);
1044 hv_iterinit((HV*)sv);
1045 while ((entry = hv_iternext((HV*)sv))) {
1047 my_setenv(hv_iterkey(entry, &keylen),
1048 SvPV_nolen_const(hv_iterval((HV*)sv, entry)));
1056 Perl_magic_clear_all_env(pTHX_ SV *sv, MAGIC *mg)
1060 #if defined(VMS) || defined(EPOC) || defined(SYMBIAN)
1061 Perl_die(aTHX_ "Can't make list assignment to %%ENV on this system");
1063 # if defined(PERL_IMPLICIT_SYS) || defined(WIN32)
1066 # ifdef USE_ENVIRON_ARRAY
1067 # if defined(USE_ITHREADS)
1068 /* only the parent thread can clobber the process environment */
1069 if (PL_curinterp == aTHX)
1072 # ifndef PERL_USE_SAFE_PUTENV
1073 if (!PL_use_safe_putenv) {
1076 if (environ == PL_origenviron)
1077 environ = (char**)safesysmalloc(sizeof(char*));
1079 for (i = 0; environ[i]; i++)
1080 safesysfree(environ[i]);
1082 # endif /* PERL_USE_SAFE_PUTENV */
1084 environ[0] = Nullch;
1086 # endif /* USE_ENVIRON_ARRAY */
1087 # endif /* PERL_IMPLICIT_SYS || WIN32 */
1088 #endif /* VMS || EPOC */
1089 #endif /* !PERL_MICRO */
1096 #ifdef HAS_SIGPROCMASK
1098 restore_sigmask(pTHX_ SV *save_sv)
1100 const sigset_t *ossetp = (const sigset_t *) SvPV_nolen_const( save_sv );
1101 (void)sigprocmask(SIG_SETMASK, ossetp, (sigset_t *)0);
1105 Perl_magic_getsig(pTHX_ SV *sv, MAGIC *mg)
1108 /* Are we fetching a signal entry? */
1109 i = whichsig(MgPV_nolen_const(mg));
1112 sv_setsv(sv,PL_psig_ptr[i]);
1114 Sighandler_t sigstate;
1115 sigstate = rsignal_state(i);
1116 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1117 if (PL_sig_handlers_initted && PL_sig_ignoring[i]) sigstate = SIG_IGN;
1119 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1120 if (PL_sig_handlers_initted && PL_sig_defaulting[i]) sigstate = SIG_DFL;
1122 /* cache state so we don't fetch it again */
1123 if(sigstate == SIG_IGN)
1124 sv_setpv(sv,"IGNORE");
1126 sv_setsv(sv,&PL_sv_undef);
1127 PL_psig_ptr[i] = SvREFCNT_inc(sv);
1134 Perl_magic_clearsig(pTHX_ SV *sv, MAGIC *mg)
1136 /* XXX Some of this code was copied from Perl_magic_setsig. A little
1137 * refactoring might be in order.
1140 register const char *s = MgPV_nolen_const(mg);
1144 if (strEQ(s,"__DIE__"))
1146 else if (strEQ(s,"__WARN__"))
1149 Perl_croak(aTHX_ "No such hook: %s", s);
1153 SvREFCNT_dec(to_dec);
1158 /* Are we clearing a signal entry? */
1161 #ifdef HAS_SIGPROCMASK
1164 /* Avoid having the signal arrive at a bad time, if possible. */
1167 sigprocmask(SIG_BLOCK, &set, &save);
1169 save_sv = newSVpv((char *)(&save), sizeof(sigset_t));
1170 SAVEFREESV(save_sv);
1171 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1174 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1175 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1177 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1178 PL_sig_defaulting[i] = 1;
1179 (void)rsignal(i, PL_csighandlerp);
1181 (void)rsignal(i, SIG_DFL);
1183 if(PL_psig_name[i]) {
1184 SvREFCNT_dec(PL_psig_name[i]);
1187 if(PL_psig_ptr[i]) {
1188 SV *to_dec=PL_psig_ptr[i];
1191 SvREFCNT_dec(to_dec);
1201 S_raise_signal(pTHX_ int sig)
1203 /* Set a flag to say this signal is pending */
1204 PL_psig_pend[sig]++;
1205 /* And one to say _a_ signal is pending */
1210 Perl_csighandler(int sig)
1212 #ifdef PERL_GET_SIG_CONTEXT
1213 dTHXa(PERL_GET_SIG_CONTEXT);
1217 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1218 (void) rsignal(sig, PL_csighandlerp);
1219 if (PL_sig_ignoring[sig]) return;
1221 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1222 if (PL_sig_defaulting[sig])
1223 #ifdef KILL_BY_SIGPRC
1224 exit((Perl_sig_to_vmscondition(sig)&STS$M_COND_ID)|STS$K_SEVERE|STS$M_INHIB_MSG);
1229 if (PL_signals & PERL_SIGNALS_UNSAFE_FLAG)
1230 /* Call the perl level handler now--
1231 * with risk we may be in malloc() etc. */
1232 (*PL_sighandlerp)(sig);
1234 S_raise_signal(aTHX_ sig);
1237 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1239 Perl_csighandler_init(void)
1242 if (PL_sig_handlers_initted) return;
1244 for (sig = 1; sig < SIG_SIZE; sig++) {
1245 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1247 PL_sig_defaulting[sig] = 1;
1248 (void) rsignal(sig, PL_csighandlerp);
1250 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1251 PL_sig_ignoring[sig] = 0;
1254 PL_sig_handlers_initted = 1;
1259 Perl_despatch_signals(pTHX)
1263 for (sig = 1; sig < SIG_SIZE; sig++) {
1264 if (PL_psig_pend[sig]) {
1265 PERL_BLOCKSIG_ADD(set, sig);
1266 PL_psig_pend[sig] = 0;
1267 PERL_BLOCKSIG_BLOCK(set);
1268 (*PL_sighandlerp)(sig);
1269 PERL_BLOCKSIG_UNBLOCK(set);
1275 Perl_magic_setsig(pTHX_ SV *sv, MAGIC *mg)
1280 /* Need to be careful with SvREFCNT_dec(), because that can have side
1281 * effects (due to closures). We must make sure that the new disposition
1282 * is in place before it is called.
1286 #ifdef HAS_SIGPROCMASK
1291 register const char *s = MgPV_const(mg,len);
1293 if (strEQ(s,"__DIE__"))
1295 else if (strEQ(s,"__WARN__"))
1298 Perl_croak(aTHX_ "No such hook: %s", s);
1306 i = whichsig(s); /* ...no, a brick */
1308 if (ckWARN(WARN_SIGNAL))
1309 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "No such signal: SIG%s", s);
1312 #ifdef HAS_SIGPROCMASK
1313 /* Avoid having the signal arrive at a bad time, if possible. */
1316 sigprocmask(SIG_BLOCK, &set, &save);
1318 save_sv = newSVpv((char *)(&save), sizeof(sigset_t));
1319 SAVEFREESV(save_sv);
1320 SAVEDESTRUCTOR_X(restore_sigmask, save_sv);
1323 #if defined(FAKE_PERSISTENT_SIGNAL_HANDLERS) || defined(FAKE_DEFAULT_SIGNAL_HANDLERS)
1324 if (!PL_sig_handlers_initted) Perl_csighandler_init();
1326 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1327 PL_sig_ignoring[i] = 0;
1329 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1330 PL_sig_defaulting[i] = 0;
1332 SvREFCNT_dec(PL_psig_name[i]);
1333 to_dec = PL_psig_ptr[i];
1334 PL_psig_ptr[i] = SvREFCNT_inc(sv);
1335 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
1336 PL_psig_name[i] = newSVpvn(s, len);
1337 SvREADONLY_on(PL_psig_name[i]);
1339 if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) {
1341 (void)rsignal(i, PL_csighandlerp);
1342 #ifdef HAS_SIGPROCMASK
1347 *svp = SvREFCNT_inc(sv);
1349 SvREFCNT_dec(to_dec);
1352 s = SvPV_force(sv,len);
1353 if (strEQ(s,"IGNORE")) {
1355 #ifdef FAKE_PERSISTENT_SIGNAL_HANDLERS
1356 PL_sig_ignoring[i] = 1;
1357 (void)rsignal(i, PL_csighandlerp);
1359 (void)rsignal(i, SIG_IGN);
1363 else if (strEQ(s,"DEFAULT") || !*s) {
1365 #ifdef FAKE_DEFAULT_SIGNAL_HANDLERS
1367 PL_sig_defaulting[i] = 1;
1368 (void)rsignal(i, PL_csighandlerp);
1371 (void)rsignal(i, SIG_DFL);
1376 * We should warn if HINT_STRICT_REFS, but without
1377 * access to a known hint bit in a known OP, we can't
1378 * tell whether HINT_STRICT_REFS is in force or not.
1380 if (!strchr(s,':') && !strchr(s,'\''))
1381 sv_insert(sv, 0, 0, "main::", 6);
1383 (void)rsignal(i, PL_csighandlerp);
1385 *svp = SvREFCNT_inc(sv);
1387 #ifdef HAS_SIGPROCMASK
1392 SvREFCNT_dec(to_dec);
1395 #endif /* !PERL_MICRO */
1398 Perl_magic_setisa(pTHX_ SV *sv, MAGIC *mg)
1402 PL_sub_generation++;
1407 Perl_magic_setamagic(pTHX_ SV *sv, MAGIC *mg)
1411 /* HV_badAMAGIC_on(Sv_STASH(sv)); */
1412 PL_amagic_generation++;
1418 Perl_magic_getnkeys(pTHX_ SV *sv, MAGIC *mg)
1420 HV * const hv = (HV*)LvTARG(sv);
1425 (void) hv_iterinit(hv);
1426 if (! SvTIED_mg((SV*)hv, PERL_MAGIC_tied))
1429 while (hv_iternext(hv))
1434 sv_setiv(sv, (IV)i);
1439 Perl_magic_setnkeys(pTHX_ SV *sv, MAGIC *mg)
1443 hv_ksplit((HV*)LvTARG(sv), SvIV(sv));
1448 /* caller is responsible for stack switching/cleanup */
1450 S_magic_methcall(pTHX_ SV *sv, const MAGIC *mg, const char *meth, I32 flags, int n, SV *val)
1456 PUSHs(SvTIED_obj(sv, mg));
1459 if (mg->mg_len >= 0)
1460 PUSHs(sv_2mortal(newSVpvn(mg->mg_ptr, mg->mg_len)));
1461 else if (mg->mg_len == HEf_SVKEY)
1462 PUSHs((SV*)mg->mg_ptr);
1464 else if (mg->mg_type == PERL_MAGIC_tiedelem) {
1465 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
1473 return call_method(meth, flags);
1477 S_magic_methpack(pTHX_ SV *sv, const MAGIC *mg, const char *meth)
1483 PUSHSTACKi(PERLSI_MAGIC);
1485 if (magic_methcall(sv, mg, meth, G_SCALAR, 2, NULL)) {
1486 sv_setsv(sv, *PL_stack_sp--);
1496 Perl_magic_getpack(pTHX_ SV *sv, MAGIC *mg)
1499 mg->mg_flags |= MGf_GSKIP;
1500 magic_methpack(sv,mg,"FETCH");
1505 Perl_magic_setpack(pTHX_ SV *sv, MAGIC *mg)
1509 PUSHSTACKi(PERLSI_MAGIC);
1510 magic_methcall(sv, mg, "STORE", G_SCALAR|G_DISCARD, 3, sv);
1517 Perl_magic_clearpack(pTHX_ SV *sv, MAGIC *mg)
1519 return magic_methpack(sv,mg,"DELETE");
1524 Perl_magic_sizepack(pTHX_ SV *sv, MAGIC *mg)
1531 PUSHSTACKi(PERLSI_MAGIC);
1532 if (magic_methcall(sv, mg, "FETCHSIZE", G_SCALAR, 2, NULL)) {
1533 sv = *PL_stack_sp--;
1534 retval = (U32) SvIV(sv)-1;
1543 Perl_magic_wipepack(pTHX_ SV *sv, MAGIC *mg)
1548 PUSHSTACKi(PERLSI_MAGIC);
1550 XPUSHs(SvTIED_obj(sv, mg));
1552 call_method("CLEAR", G_SCALAR|G_DISCARD);
1560 Perl_magic_nextpack(pTHX_ SV *sv, MAGIC *mg, SV *key)
1563 const char * const meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1567 PUSHSTACKi(PERLSI_MAGIC);
1570 PUSHs(SvTIED_obj(sv, mg));
1575 if (call_method(meth, G_SCALAR))
1576 sv_setsv(key, *PL_stack_sp--);
1585 Perl_magic_existspack(pTHX_ SV *sv, MAGIC *mg)
1587 return magic_methpack(sv,mg,"EXISTS");
1591 Perl_magic_scalarpack(pTHX_ HV *hv, MAGIC *mg)
1594 SV *retval = &PL_sv_undef;
1595 SV *tied = SvTIED_obj((SV*)hv, mg);
1596 HV *pkg = SvSTASH((SV*)SvRV(tied));
1598 if (!gv_fetchmethod_autoload(pkg, "SCALAR", FALSE)) {
1600 if (HvEITER_get(hv))
1601 /* we are in an iteration so the hash cannot be empty */
1603 /* no xhv_eiter so now use FIRSTKEY */
1604 key = sv_newmortal();
1605 magic_nextpack((SV*)hv, mg, key);
1606 HvEITER_set(hv, NULL); /* need to reset iterator */
1607 return SvOK(key) ? &PL_sv_yes : &PL_sv_no;
1610 /* there is a SCALAR method that we can call */
1612 PUSHSTACKi(PERLSI_MAGIC);
1618 if (call_method("SCALAR", G_SCALAR))
1619 retval = *PL_stack_sp--;
1626 Perl_magic_setdbline(pTHX_ SV *sv, MAGIC *mg)
1635 svp = av_fetch(GvAV(gv),
1636 atoi(MgPV_nolen_const(mg)), FALSE);
1637 if (svp && SvIOKp(*svp) && (o = INT2PTR(OP*,SvIVX(*svp)))) {
1638 /* set or clear breakpoint in the relevant control op */
1640 o->op_flags |= OPf_SPECIAL;
1642 o->op_flags &= ~OPf_SPECIAL;
1648 Perl_magic_getarylen(pTHX_ SV *sv, MAGIC *mg)
1650 AV *obj = (AV*)mg->mg_obj;
1652 sv_setiv(sv, AvFILL(obj) + PL_curcop->cop_arybase);
1660 Perl_magic_setarylen(pTHX_ SV *sv, MAGIC *mg)
1662 AV *obj = (AV*)mg->mg_obj;
1664 av_fill(obj, SvIV(sv) - PL_curcop->cop_arybase);
1666 if (ckWARN(WARN_MISC))
1667 Perl_warner(aTHX_ packWARN(WARN_MISC),
1668 "Attempt to set length of freed array");
1674 Perl_magic_freearylen_p(pTHX_ SV *sv, MAGIC *mg)
1676 mg = mg_find (mg->mg_obj, PERL_MAGIC_arylen);
1679 /* arylen scalar holds a pointer back to the array, but doesn't own a
1680 reference. Hence the we (the array) are about to go away with it
1681 still pointing at us. Clear its pointer, else it would be pointing
1682 at free memory. See the comment in sv_magic about reference loops,
1683 and why it can't own a reference to us. */
1690 Perl_magic_getpos(pTHX_ SV *sv, MAGIC *mg)
1692 SV* lsv = LvTARG(sv);
1694 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1695 mg = mg_find(lsv, PERL_MAGIC_regex_global);
1696 if (mg && mg->mg_len >= 0) {
1699 sv_pos_b2u(lsv, &i);
1700 sv_setiv(sv, i + PL_curcop->cop_arybase);
1709 Perl_magic_setpos(pTHX_ SV *sv, MAGIC *mg)
1711 SV* lsv = LvTARG(sv);
1718 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
1719 mg = mg_find(lsv, PERL_MAGIC_regex_global);
1723 sv_magic(lsv, (SV*)0, PERL_MAGIC_regex_global, Nullch, 0);
1724 mg = mg_find(lsv, PERL_MAGIC_regex_global);
1726 else if (!SvOK(sv)) {
1730 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1732 pos = SvIV(sv) - PL_curcop->cop_arybase;
1735 ulen = sv_len_utf8(lsv);
1745 else if (pos > (SSize_t)len)
1750 sv_pos_u2b(lsv, &p, 0);
1755 mg->mg_flags &= ~MGf_MINMATCH;
1761 Perl_magic_getglob(pTHX_ SV *sv, MAGIC *mg)
1764 if (SvFAKE(sv)) { /* FAKE globs can get coerced */
1766 gv_efullname3(sv,((GV*)sv), "*");
1770 gv_efullname3(sv,((GV*)sv), "*"); /* a gv value, be nice */
1775 Perl_magic_setglob(pTHX_ SV *sv, MAGIC *mg)
1782 gv = gv_fetchsv(sv,TRUE, SVt_PVGV);
1787 GvGP(sv) = gp_ref(GvGP(gv));
1792 Perl_magic_getsubstr(pTHX_ SV *sv, MAGIC *mg)
1795 SV * const lsv = LvTARG(sv);
1796 const char * const tmps = SvPV_const(lsv,len);
1797 I32 offs = LvTARGOFF(sv);
1798 I32 rem = LvTARGLEN(sv);
1802 sv_pos_u2b(lsv, &offs, &rem);
1803 if (offs > (I32)len)
1805 if (rem + offs > (I32)len)
1807 sv_setpvn(sv, tmps + offs, (STRLEN)rem);
1814 Perl_magic_setsubstr(pTHX_ SV *sv, MAGIC *mg)
1817 const char *tmps = SvPV_const(sv, len);
1818 SV * const lsv = LvTARG(sv);
1819 I32 lvoff = LvTARGOFF(sv);
1820 I32 lvlen = LvTARGLEN(sv);
1824 sv_utf8_upgrade(lsv);
1825 sv_pos_u2b(lsv, &lvoff, &lvlen);
1826 sv_insert(lsv, lvoff, lvlen, tmps, len);
1827 LvTARGLEN(sv) = sv_len_utf8(sv);
1830 else if (lsv && SvUTF8(lsv)) {
1831 sv_pos_u2b(lsv, &lvoff, &lvlen);
1832 LvTARGLEN(sv) = len;
1833 tmps = (char*)bytes_to_utf8((U8*)tmps, &len);
1834 sv_insert(lsv, lvoff, lvlen, tmps, len);
1838 sv_insert(lsv, lvoff, lvlen, tmps, len);
1839 LvTARGLEN(sv) = len;
1847 Perl_magic_gettaint(pTHX_ SV *sv, MAGIC *mg)
1849 TAINT_IF((mg->mg_len & 1) ||
1850 ((mg->mg_len & 2) && mg->mg_obj == sv)); /* kludge */
1855 Perl_magic_settaint(pTHX_ SV *sv, MAGIC *mg)
1858 if (PL_localizing) {
1859 if (PL_localizing == 1)
1864 else if (PL_tainted)
1872 Perl_magic_getvec(pTHX_ SV *sv, MAGIC *mg)
1874 SV * const lsv = LvTARG(sv);
1882 sv_setuv(sv, do_vecget(lsv, LvTARGOFF(sv), LvTARGLEN(sv)));
1887 Perl_magic_setvec(pTHX_ SV *sv, MAGIC *mg)
1890 do_vecset(sv); /* XXX slurp this routine */
1895 Perl_magic_getdefelem(pTHX_ SV *sv, MAGIC *mg)
1898 if (LvTARGLEN(sv)) {
1900 SV *ahv = LvTARG(sv);
1901 HE *he = hv_fetch_ent((HV*)ahv, mg->mg_obj, FALSE, 0);
1906 AV* av = (AV*)LvTARG(sv);
1907 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
1908 targ = AvARRAY(av)[LvTARGOFF(sv)];
1910 if (targ && targ != &PL_sv_undef) {
1911 /* somebody else defined it for us */
1912 SvREFCNT_dec(LvTARG(sv));
1913 LvTARG(sv) = SvREFCNT_inc(targ);
1915 SvREFCNT_dec(mg->mg_obj);
1916 mg->mg_obj = Nullsv;
1917 mg->mg_flags &= ~MGf_REFCOUNTED;
1922 sv_setsv(sv, targ ? targ : &PL_sv_undef);
1927 Perl_magic_setdefelem(pTHX_ SV *sv, MAGIC *mg)
1933 sv_setsv(LvTARG(sv), sv);
1934 SvSETMAGIC(LvTARG(sv));
1940 Perl_vivify_defelem(pTHX_ SV *sv)
1945 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, PERL_MAGIC_defelem)))
1948 SV *ahv = LvTARG(sv);
1949 HE *he = hv_fetch_ent((HV*)ahv, mg->mg_obj, TRUE, 0);
1952 if (!value || value == &PL_sv_undef)
1953 Perl_croak(aTHX_ PL_no_helem_sv, mg->mg_obj);
1956 AV* av = (AV*)LvTARG(sv);
1957 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
1958 LvTARG(sv) = Nullsv; /* array can't be extended */
1960 SV** svp = av_fetch(av, LvTARGOFF(sv), TRUE);
1961 if (!svp || (value = *svp) == &PL_sv_undef)
1962 Perl_croak(aTHX_ PL_no_aelem, (I32)LvTARGOFF(sv));
1965 (void)SvREFCNT_inc(value);
1966 SvREFCNT_dec(LvTARG(sv));
1969 SvREFCNT_dec(mg->mg_obj);
1970 mg->mg_obj = Nullsv;
1971 mg->mg_flags &= ~MGf_REFCOUNTED;
1975 Perl_magic_killbackrefs(pTHX_ SV *sv, MAGIC *mg)
1977 AV *av = (AV*)mg->mg_obj;
1978 SV **svp = AvARRAY(av);
1979 I32 i = AvFILLp(av);
1984 if (!SvWEAKREF(svp[i]))
1985 Perl_croak(aTHX_ "panic: magic_killbackrefs");
1986 /* XXX Should we check that it hasn't changed? */
1987 SvRV_set(svp[i], 0);
1989 SvWEAKREF_off(svp[i]);
1994 SvREFCNT_dec(av); /* remove extra count added by sv_add_backref() */
1999 Perl_magic_setmglob(pTHX_ SV *sv, MAGIC *mg)
2007 Perl_magic_setbm(pTHX_ SV *sv, MAGIC *mg)
2010 sv_unmagic(sv, PERL_MAGIC_bm);
2016 Perl_magic_setfm(pTHX_ SV *sv, MAGIC *mg)
2019 sv_unmagic(sv, PERL_MAGIC_fm);
2025 Perl_magic_setuvar(pTHX_ SV *sv, MAGIC *mg)
2027 const struct ufuncs * const uf = (struct ufuncs *)mg->mg_ptr;
2029 if (uf && uf->uf_set)
2030 (*uf->uf_set)(aTHX_ uf->uf_index, sv);
2035 Perl_magic_setregexp(pTHX_ SV *sv, MAGIC *mg)
2038 sv_unmagic(sv, PERL_MAGIC_qr);
2043 Perl_magic_freeregexp(pTHX_ SV *sv, MAGIC *mg)
2045 regexp *re = (regexp *)mg->mg_obj;
2051 #ifdef USE_LOCALE_COLLATE
2053 Perl_magic_setcollxfrm(pTHX_ SV *sv, MAGIC *mg)
2056 * RenE<eacute> Descartes said "I think not."
2057 * and vanished with a faint plop.
2061 Safefree(mg->mg_ptr);
2067 #endif /* USE_LOCALE_COLLATE */
2069 /* Just clear the UTF-8 cache data. */
2071 Perl_magic_setutf8(pTHX_ SV *sv, MAGIC *mg)
2074 Safefree(mg->mg_ptr); /* The mg_ptr holds the pos cache. */
2076 mg->mg_len = -1; /* The mg_len holds the len cache. */
2081 Perl_magic_set(pTHX_ SV *sv, MAGIC *mg)
2083 register const char *s;
2086 switch (*mg->mg_ptr) {
2087 case '\001': /* ^A */
2088 sv_setsv(PL_bodytarget, sv);
2090 case '\003': /* ^C */
2091 PL_minus_c = (bool)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
2094 case '\004': /* ^D */
2096 s = SvPV_nolen_const(sv);
2097 PL_debug = get_debug_opts(&s, 0) | DEBUG_TOP_FLAG;
2098 DEBUG_x(dump_all());
2100 PL_debug = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) | DEBUG_TOP_FLAG;
2103 case '\005': /* ^E */
2104 if (*(mg->mg_ptr+1) == '\0') {
2105 #ifdef MACOS_TRADITIONAL
2106 gMacPerl_OSErr = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
2109 set_vaxc_errno(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
2112 SetLastError( SvIV(sv) );
2115 os2_setsyserrno(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
2117 /* will anyone ever use this? */
2118 SETERRNO(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv), 4);
2124 else if (strEQ(mg->mg_ptr+1, "NCODING")) {
2126 SvREFCNT_dec(PL_encoding);
2127 if (SvOK(sv) || SvGMAGICAL(sv)) {
2128 PL_encoding = newSVsv(sv);
2131 PL_encoding = Nullsv;
2135 case '\006': /* ^F */
2136 PL_maxsysfd = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
2138 case '\010': /* ^H */
2139 PL_hints = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
2141 case '\011': /* ^I */ /* NOT \t in EBCDIC */
2143 Safefree(PL_inplace);
2145 PL_inplace = savesvpv(sv);
2147 PL_inplace = Nullch;
2149 case '\017': /* ^O */
2150 if (*(mg->mg_ptr+1) == '\0') {
2152 Safefree(PL_osname);
2156 TAINT_PROPER("assigning to $^O");
2157 PL_osname = savesvpv(sv);
2160 else if (strEQ(mg->mg_ptr, "\017PEN")) {
2161 if (!PL_compiling.cop_io)
2162 PL_compiling.cop_io = newSVsv(sv);
2164 sv_setsv(PL_compiling.cop_io,sv);
2167 case '\020': /* ^P */
2168 PL_perldb = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
2169 if (PL_perldb && !PL_DBsingle)
2172 case '\024': /* ^T */
2174 PL_basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
2176 PL_basetime = (Time_t)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
2179 case '\027': /* ^W & $^WARNING_BITS */
2180 if (*(mg->mg_ptr+1) == '\0') {
2181 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2182 i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
2183 PL_dowarn = (PL_dowarn & ~G_WARN_ON)
2184 | (i ? G_WARN_ON : G_WARN_OFF) ;
2187 else if (strEQ(mg->mg_ptr+1, "ARNING_BITS")) {
2188 if ( ! (PL_dowarn & G_WARN_ALL_MASK)) {
2189 if (!SvPOK(sv) && PL_localizing) {
2190 sv_setpvn(sv, WARN_NONEstring, WARNsize);
2191 PL_compiling.cop_warnings = pWARN_NONE;
2196 int accumulate = 0 ;
2197 int any_fatals = 0 ;
2198 const char * const ptr = SvPV_const(sv, len) ;
2199 for (i = 0 ; i < len ; ++i) {
2200 accumulate |= ptr[i] ;
2201 any_fatals |= (ptr[i] & 0xAA) ;
2204 PL_compiling.cop_warnings = pWARN_NONE;
2205 else if (isWARN_on(sv, WARN_ALL) && !any_fatals) {
2206 PL_compiling.cop_warnings = pWARN_ALL;
2207 PL_dowarn |= G_WARN_ONCE ;
2210 if (specialWARN(PL_compiling.cop_warnings))
2211 PL_compiling.cop_warnings = newSVsv(sv) ;
2213 sv_setsv(PL_compiling.cop_warnings, sv);
2214 if (isWARN_on(PL_compiling.cop_warnings, WARN_ONCE))
2215 PL_dowarn |= G_WARN_ONCE ;
2223 if (PL_localizing) {
2224 if (PL_localizing == 1)
2225 SAVESPTR(PL_last_in_gv);
2227 else if (SvOK(sv) && GvIO(PL_last_in_gv))
2228 IoLINES(GvIOp(PL_last_in_gv)) = SvIV(sv);
2231 Safefree(IoTOP_NAME(GvIOp(PL_defoutgv)));
2232 s = IoTOP_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2233 IoTOP_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv,TRUE, SVt_PVIO);
2236 Safefree(IoFMT_NAME(GvIOp(PL_defoutgv)));
2237 s = IoFMT_NAME(GvIOp(PL_defoutgv)) = savesvpv(sv);
2238 IoFMT_GV(GvIOp(PL_defoutgv)) = gv_fetchsv(sv,TRUE, SVt_PVIO);
2241 IoPAGE_LEN(GvIOp(PL_defoutgv)) = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
2244 IoLINES_LEFT(GvIOp(PL_defoutgv)) = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
2245 if (IoLINES_LEFT(GvIOp(PL_defoutgv)) < 0L)
2246 IoLINES_LEFT(GvIOp(PL_defoutgv)) = 0L;
2249 IoPAGE(GvIOp(PL_defoutgv)) = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
2253 IO *io = GvIOp(PL_defoutgv);
2256 if ((SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) == 0)
2257 IoFLAGS(io) &= ~IOf_FLUSH;
2259 if (!(IoFLAGS(io) & IOf_FLUSH)) {
2260 PerlIO *ofp = IoOFP(io);
2262 (void)PerlIO_flush(ofp);
2263 IoFLAGS(io) |= IOf_FLUSH;
2269 SvREFCNT_dec(PL_rs);
2270 PL_rs = newSVsv(sv);
2274 SvREFCNT_dec(PL_ors_sv);
2275 if (SvOK(sv) || SvGMAGICAL(sv)) {
2276 PL_ors_sv = newSVsv(sv);
2284 SvREFCNT_dec(PL_ofs_sv);
2285 if (SvOK(sv) || SvGMAGICAL(sv)) {
2286 PL_ofs_sv = newSVsv(sv);
2295 PL_ofmt = savesvpv(sv);
2298 PL_compiling.cop_arybase = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
2301 #ifdef COMPLEX_STATUS
2302 if (PL_localizing == 2) {
2303 PL_statusvalue = LvTARGOFF(sv);
2304 PL_statusvalue_vms = LvTARGLEN(sv);
2308 #ifdef VMSISH_STATUS
2310 STATUS_NATIVE_SET((U32)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)));
2313 STATUS_UNIX_SET(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
2318 # define PERL_VMS_BANG vaxc$errno
2320 # define PERL_VMS_BANG 0
2322 SETERRNO(SvIOK(sv) ? SvIVX(sv) : SvOK(sv) ? sv_2iv(sv) : 0,
2323 (SvIV(sv) == EVMSERR) ? 4 : PERL_VMS_BANG);
2327 PL_uid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
2328 if (PL_delaymagic) {
2329 PL_delaymagic |= DM_RUID;
2330 break; /* don't do magic till later */
2333 (void)setruid((Uid_t)PL_uid);
2336 (void)setreuid((Uid_t)PL_uid, (Uid_t)-1);
2338 #ifdef HAS_SETRESUID
2339 (void)setresuid((Uid_t)PL_uid, (Uid_t)-1, (Uid_t)-1);
2341 if (PL_uid == PL_euid) { /* special case $< = $> */
2343 /* workaround for Darwin's setuid peculiarity, cf [perl #24122] */
2344 if (PL_uid != 0 && PerlProc_getuid() == 0)
2345 (void)PerlProc_setuid(0);
2347 (void)PerlProc_setuid(PL_uid);
2349 PL_uid = PerlProc_getuid();
2350 Perl_croak(aTHX_ "setruid() not implemented");
2355 PL_uid = PerlProc_getuid();
2356 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2359 PL_euid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
2360 if (PL_delaymagic) {
2361 PL_delaymagic |= DM_EUID;
2362 break; /* don't do magic till later */
2365 (void)seteuid((Uid_t)PL_euid);
2368 (void)setreuid((Uid_t)-1, (Uid_t)PL_euid);
2370 #ifdef HAS_SETRESUID
2371 (void)setresuid((Uid_t)-1, (Uid_t)PL_euid, (Uid_t)-1);
2373 if (PL_euid == PL_uid) /* special case $> = $< */
2374 PerlProc_setuid(PL_euid);
2376 PL_euid = PerlProc_geteuid();
2377 Perl_croak(aTHX_ "seteuid() not implemented");
2382 PL_euid = PerlProc_geteuid();
2383 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2386 PL_gid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
2387 if (PL_delaymagic) {
2388 PL_delaymagic |= DM_RGID;
2389 break; /* don't do magic till later */
2392 (void)setrgid((Gid_t)PL_gid);
2395 (void)setregid((Gid_t)PL_gid, (Gid_t)-1);
2397 #ifdef HAS_SETRESGID
2398 (void)setresgid((Gid_t)PL_gid, (Gid_t)-1, (Gid_t) 1);
2400 if (PL_gid == PL_egid) /* special case $( = $) */
2401 (void)PerlProc_setgid(PL_gid);
2403 PL_gid = PerlProc_getgid();
2404 Perl_croak(aTHX_ "setrgid() not implemented");
2409 PL_gid = PerlProc_getgid();
2410 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2413 #ifdef HAS_SETGROUPS
2415 const char *p = SvPV_const(sv, len);
2416 Groups_t gary[NGROUPS];
2421 for (i = 0; i < NGROUPS; ++i) {
2422 while (*p && !isSPACE(*p))
2431 (void)setgroups(i, gary);
2433 #else /* HAS_SETGROUPS */
2434 PL_egid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
2435 #endif /* HAS_SETGROUPS */
2436 if (PL_delaymagic) {
2437 PL_delaymagic |= DM_EGID;
2438 break; /* don't do magic till later */
2441 (void)setegid((Gid_t)PL_egid);
2444 (void)setregid((Gid_t)-1, (Gid_t)PL_egid);
2446 #ifdef HAS_SETRESGID
2447 (void)setresgid((Gid_t)-1, (Gid_t)PL_egid, (Gid_t)-1);
2449 if (PL_egid == PL_gid) /* special case $) = $( */
2450 (void)PerlProc_setgid(PL_egid);
2452 PL_egid = PerlProc_getegid();
2453 Perl_croak(aTHX_ "setegid() not implemented");
2458 PL_egid = PerlProc_getegid();
2459 PL_tainting |= (PL_uid && (PL_euid != PL_uid || PL_egid != PL_gid));
2462 PL_chopset = SvPV_force(sv,len);
2464 #ifndef MACOS_TRADITIONAL
2466 LOCK_DOLLARZERO_MUTEX;
2467 #ifdef HAS_SETPROCTITLE
2468 /* The BSDs don't show the argv[] in ps(1) output, they
2469 * show a string from the process struct and provide
2470 * the setproctitle() routine to manipulate that. */
2472 s = SvPV_const(sv, len);
2473 # if __FreeBSD_version > 410001
2474 /* The leading "-" removes the "perl: " prefix,
2475 * but not the "(perl) suffix from the ps(1)
2476 * output, because that's what ps(1) shows if the
2477 * argv[] is modified. */
2478 setproctitle("-%s", s);
2479 # else /* old FreeBSDs, NetBSD, OpenBSD, anyBSD */
2480 /* This doesn't really work if you assume that
2481 * $0 = 'foobar'; will wipe out 'perl' from the $0
2482 * because in ps(1) output the result will be like
2483 * sprintf("perl: %s (perl)", s)
2484 * I guess this is a security feature:
2485 * one (a user process) cannot get rid of the original name.
2487 setproctitle("%s", s);
2491 #if defined(__hpux) && defined(PSTAT_SETCMD)
2494 s = SvPV_const(sv, len);
2495 un.pst_command = (char *)s;
2496 pstat(PSTAT_SETCMD, un, len, 0, 0);
2499 /* PL_origalen is set in perl_parse(). */
2500 s = SvPV_force(sv,len);
2501 if (len >= (STRLEN)PL_origalen-1) {
2502 /* Longer than original, will be truncated. We assume that
2503 * PL_origalen bytes are available. */
2504 Copy(s, PL_origargv[0], PL_origalen-1, char);
2507 /* Shorter than original, will be padded. */
2508 Copy(s, PL_origargv[0], len, char);
2509 PL_origargv[0][len] = 0;
2510 memset(PL_origargv[0] + len + 1,
2511 /* Is the space counterintuitive? Yes.
2512 * (You were expecting \0?)
2513 * Does it work? Seems to. (In Linux 2.4.20 at least.)
2516 PL_origalen - len - 1);
2518 PL_origargv[0][PL_origalen-1] = 0;
2519 for (i = 1; i < PL_origargc; i++)
2521 UNLOCK_DOLLARZERO_MUTEX;
2529 Perl_whichsig(pTHX_ const char *sig)
2531 register char* const* sigv;
2533 for (sigv = (char* const*)PL_sig_name; *sigv; sigv++)
2534 if (strEQ(sig,*sigv))
2535 return PL_sig_num[sigv - (char* const*)PL_sig_name];
2537 if (strEQ(sig,"CHLD"))
2541 if (strEQ(sig,"CLD"))
2548 Perl_sighandler(int sig)
2550 #ifdef PERL_GET_SIG_CONTEXT
2551 dTHXa(PERL_GET_SIG_CONTEXT);
2558 SV *sv = Nullsv, *tSv = PL_Sv;
2564 if (PL_savestack_ix + 15 <= PL_savestack_max)
2566 if (PL_markstack_ptr < PL_markstack_max - 2)
2568 if (PL_scopestack_ix < PL_scopestack_max - 3)
2571 if (!PL_psig_ptr[sig]) {
2572 PerlIO_printf(Perl_error_log, "Signal SIG%s received, but no signal handler set.\n",
2577 /* Max number of items pushed there is 3*n or 4. We cannot fix
2578 infinity, so we fix 4 (in fact 5): */
2580 PL_savestack_ix += 5; /* Protect save in progress. */
2581 SAVEDESTRUCTOR_X(unwind_handler_stack, (void*)&flags);
2584 PL_markstack_ptr++; /* Protect mark. */
2586 PL_scopestack_ix += 1;
2587 /* sv_2cv is too complicated, try a simpler variant first: */
2588 if (!SvROK(PL_psig_ptr[sig]) || !(cv = (CV*)SvRV(PL_psig_ptr[sig]))
2589 || SvTYPE(cv) != SVt_PVCV)
2590 cv = sv_2cv(PL_psig_ptr[sig],&st,&gv,TRUE);
2592 if (!cv || !CvROOT(cv)) {
2593 if (ckWARN(WARN_SIGNAL))
2594 Perl_warner(aTHX_ packWARN(WARN_SIGNAL), "SIG%s handler \"%s\" not defined.\n",
2595 PL_sig_name[sig], (gv ? GvENAME(gv)
2602 if(PL_psig_name[sig]) {
2603 sv = SvREFCNT_inc(PL_psig_name[sig]);
2605 #if !defined(PERL_IMPLICIT_CONTEXT)
2609 sv = sv_newmortal();
2610 sv_setpv(sv,PL_sig_name[sig]);
2613 PUSHSTACKi(PERLSI_SIGNAL);
2618 call_sv((SV*)cv, G_DISCARD|G_EVAL);
2621 if (SvTRUE(ERRSV)) {
2623 #ifdef HAS_SIGPROCMASK
2624 /* Handler "died", for example to get out of a restart-able read().
2625 * Before we re-do that on its behalf re-enable the signal which was
2626 * blocked by the system when we entered.
2630 sigaddset(&set,sig);
2631 sigprocmask(SIG_UNBLOCK, &set, NULL);
2633 /* Not clear if this will work */
2634 (void)rsignal(sig, SIG_IGN);
2635 (void)rsignal(sig, PL_csighandlerp);
2637 #endif /* !PERL_MICRO */
2642 PL_savestack_ix -= 8; /* Unprotect save in progress. */
2646 PL_scopestack_ix -= 1;
2649 PL_op = myop; /* Apparently not needed... */
2651 PL_Sv = tSv; /* Restore global temporaries. */
2658 restore_magic(pTHX_ const void *p)
2660 MGS* mgs = SSPTR(PTR2IV(p), MGS*);
2661 SV* sv = mgs->mgs_sv;
2666 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
2668 #ifdef PERL_OLD_COPY_ON_WRITE
2669 /* While magic was saved (and off) sv_setsv may well have seen
2670 this SV as a prime candidate for COW. */
2672 sv_force_normal(sv);
2676 SvFLAGS(sv) |= mgs->mgs_flags;
2680 SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK);
2683 mgs->mgs_sv = NULL; /* mark the MGS structure as restored */
2685 /* If we're still on top of the stack, pop us off. (That condition
2686 * will be satisfied if restore_magic was called explicitly, but *not*
2687 * if it's being called via leave_scope.)
2688 * The reason for doing this is that otherwise, things like sv_2cv()
2689 * may leave alloc gunk on the savestack, and some code
2690 * (e.g. sighandler) doesn't expect that...
2692 if (PL_savestack_ix == mgs->mgs_ss_ix)
2694 I32 popval = SSPOPINT;
2695 assert(popval == SAVEt_DESTRUCTOR_X);
2696 PL_savestack_ix -= 2;
2698 assert(popval == SAVEt_ALLOC);
2700 PL_savestack_ix -= popval;
2706 unwind_handler_stack(pTHX_ const void *p)
2709 const U32 flags = *(const U32*)p;
2712 PL_savestack_ix -= 5; /* Unprotect save in progress. */
2713 /* cxstack_ix-- Not needed, die already unwound it. */
2714 #if !defined(PERL_IMPLICIT_CONTEXT)
2716 SvREFCNT_dec(PL_sig_sv);
2722 * c-indentation-style: bsd
2724 * indent-tabs-mode: t
2727 * ex: set ts=8 sts=4 sw=4 noet: