3 * Copyright (c) 1991-1997, Larry Wall
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
11 * "Sam sat on the ground and put his head in his hands. 'I wish I had never
12 * come here, and I don't want to see no more magic,' he said, and fell silent."
18 /* XXX If this causes problems, set i_unistd=undef in the hint file. */
23 #if defined(HAS_GETGROUPS) || defined(HAS_SETGROUPS)
30 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
37 typedef struct magic_state MGS;
39 static void restore_magic _((void *p));
42 save_magic(MGS *mgs, SV *sv)
44 assert(SvMAGICAL(sv));
47 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
48 SAVEDESTRUCTOR(restore_magic, mgs);
52 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
56 restore_magic(void *p)
61 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
64 SvFLAGS(sv) |= mgs->mgs_flags;
68 SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK);
77 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
78 MGVTBL* vtbl = mg->mg_virtual;
80 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
84 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)) || vtbl->svt_clear)
102 while ((mg = *mgp) != 0) {
103 MGVTBL* vtbl = mg->mg_virtual;
104 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
105 (*vtbl->svt_get)(sv, mg);
106 /* Ignore this magic if it's been deleted */
107 if ((mg == (mgp_valid ? *mgp : SvMAGIC(sv))) &&
108 (mg->mg_flags & MGf_GSKIP))
111 /* Advance to next magic (complicated by possible deletion) */
112 if (mg == (mgp_valid ? *mgp : SvMAGIC(sv))) {
113 mgp = &mg->mg_moremagic;
117 mgp = &SvMAGIC(sv); /* Re-establish pointer after sv_upgrade */
132 save_magic(&mgs, sv);
134 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
135 MGVTBL* vtbl = mg->mg_virtual;
136 nextmg = mg->mg_moremagic; /* it may delete itself */
137 if (mg->mg_flags & MGf_GSKIP) {
138 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
141 if (vtbl && vtbl->svt_set)
142 (*vtbl->svt_set)(sv, mg);
156 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
157 MGVTBL* vtbl = mg->mg_virtual;
158 if (vtbl && vtbl->svt_len) {
162 save_magic(&mgs, sv);
163 /* omit MGf_GSKIP -- not changed here */
164 len = (*vtbl->svt_len)(sv, mg);
170 junk = SvPV(sv, len);
181 save_magic(&mgs, sv);
183 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
184 MGVTBL* vtbl = mg->mg_virtual;
185 /* omit GSKIP -- never set here */
187 if (vtbl && vtbl->svt_clear)
188 (*vtbl->svt_clear)(sv, mg);
196 mg_find(SV *sv, int type)
199 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
200 if (mg->mg_type == type)
207 mg_copy(SV *sv, SV *nsv, char *key, I32 klen)
211 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
212 if (isUPPER(mg->mg_type)) {
213 sv_magic(nsv, mg->mg_obj, toLOWER(mg->mg_type), key, klen);
225 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
226 MGVTBL* vtbl = mg->mg_virtual;
227 moremagic = mg->mg_moremagic;
228 if (vtbl && vtbl->svt_free)
229 (*vtbl->svt_free)(sv, mg);
230 if (mg->mg_ptr && mg->mg_type != 'g')
232 Safefree(mg->mg_ptr);
233 else if (mg->mg_len == HEf_SVKEY)
234 SvREFCNT_dec((SV*)mg->mg_ptr);
235 if (mg->mg_flags & MGf_REFCOUNTED)
236 SvREFCNT_dec(mg->mg_obj);
243 #if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
248 magic_len(SV *sv, MAGIC *mg)
257 switch (*mg->mg_ptr) {
258 case '1': case '2': case '3': case '4':
259 case '5': case '6': case '7': case '8': case '9': case '&':
260 if (curpm && (rx = curpm->op_pmregexp)) {
261 paren = atoi(mg->mg_ptr);
263 if (paren <= rx->nparens &&
264 (s = rx->startp[paren]) &&
265 (t = rx->endp[paren]))
274 if (curpm && (rx = curpm->op_pmregexp)) {
275 paren = rx->lastparen;
281 if (curpm && (rx = curpm->op_pmregexp)) {
282 if ((s = rx->subbeg) && rx->startp[0]) {
283 i = rx->startp[0] - s;
290 if (curpm && (rx = curpm->op_pmregexp)) {
291 if (rx->subend && (s = rx->endp[0])) {
299 return (STRLEN)ofslen;
301 return (STRLEN)orslen;
304 if (!SvPOK(sv) && SvNIOK(sv))
312 magic_get(SV *sv, MAGIC *mg)
321 switch (*mg->mg_ptr) {
322 case '\001': /* ^A */
323 sv_setsv(sv, bodytarget);
325 case '\004': /* ^D */
326 sv_setiv(sv, (IV)(debug & 32767));
328 case '\005': /* ^E */
331 # include <descrip.h>
332 # include <starlet.h>
334 $DESCRIPTOR(msgdsc,msg);
335 sv_setnv(sv,(double) vaxc$errno);
336 if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
337 sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
343 if (!(_emx_env & 0x200)) { /* Under DOS */
344 sv_setnv(sv, (double)errno);
345 sv_setpv(sv, errno ? Strerror(errno) : "");
347 if (errno != errno_isOS2)
348 Perl_rc = _syserrno();
349 sv_setnv(sv, (double)Perl_rc);
350 sv_setpv(sv, os2error(Perl_rc));
353 sv_setnv(sv, (double)errno);
354 sv_setpv(sv, errno ? Strerror(errno) : "");
357 SvNOK_on(sv); /* what a wonderful hack! */
359 case '\006': /* ^F */
360 sv_setiv(sv, (IV)maxsysfd);
362 case '\010': /* ^H */
363 sv_setiv(sv, (IV)hints);
367 sv_setpv(sv, inplace);
369 sv_setsv(sv, &sv_undef);
371 case '\017': /* ^O */
372 sv_setpv(sv, osname);
374 case '\020': /* ^P */
375 sv_setiv(sv, (IV)perldb);
377 case '\023': /* ^S */
380 if (lex_state != LEX_NOTPARSING)
388 case '\024': /* ^T */
390 sv_setnv(sv, basetime);
392 sv_setiv(sv, (IV)basetime);
395 case '\027': /* ^W */
396 sv_setiv(sv, (IV)dowarn);
398 case '1': case '2': case '3': case '4':
399 case '5': case '6': case '7': case '8': case '9': case '&':
400 if (curpm && (rx = curpm->op_pmregexp)) {
402 * Pre-threads, this was paren = atoi(GvENAME((GV*)mg->mg_obj));
403 * XXX Does the new way break anything?
405 paren = atoi(mg->mg_ptr);
407 if (paren <= rx->nparens &&
408 (s = rx->startp[paren]) &&
409 (t = rx->endp[paren]))
416 was_tainted = tainted;
421 tainted = was_tainted || rx->exec_tainted;
426 sv_setsv(sv,&sv_undef);
429 if (curpm && (rx = curpm->op_pmregexp)) {
430 paren = rx->lastparen;
434 sv_setsv(sv,&sv_undef);
437 if (curpm && (rx = curpm->op_pmregexp)) {
438 if ((s = rx->subbeg) && rx->startp[0]) {
439 i = rx->startp[0] - s;
443 sv_setsv(sv,&sv_undef);
446 if (curpm && (rx = curpm->op_pmregexp)) {
447 if (rx->subend && (s = rx->endp[0])) {
452 sv_setsv(sv,&sv_undef);
456 if (GvIO(last_in_gv)) {
457 sv_setiv(sv, (IV)IoLINES(GvIO(last_in_gv)));
464 sv_setiv(sv, (IV)STATUS_CURRENT);
465 #ifdef COMPLEX_STATUS
466 LvTARGOFF(sv) = statusvalue;
467 LvTARGLEN(sv) = statusvalue_vms;
472 s = IoTOP_NAME(GvIOp(defoutgv));
476 sv_setpv(sv,GvENAME(defoutgv));
481 s = IoFMT_NAME(GvIOp(defoutgv));
483 s = GvENAME(defoutgv);
488 sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(defoutgv)));
491 sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(defoutgv)));
494 sv_setiv(sv, (IV)IoPAGE(GvIOp(defoutgv)));
502 WITH_THR(sv_setiv(sv, (IV)curcop->cop_arybase));
505 sv_setiv(sv, (IV)(IoFLAGS(GvIOp(defoutgv)) & IOf_FLUSH) != 0 );
508 sv_setpvn(sv,ofs,ofslen);
511 sv_setpvn(sv,ors,orslen);
518 sv_setnv(sv, (double)((errno == EVMSERR) ? vaxc$errno : errno));
519 sv_setpv(sv, errno ? Strerror(errno) : "");
522 int saveerrno = errno;
523 sv_setnv(sv, (double)errno);
525 if (errno == errno_isOS2) sv_setpv(sv, os2error(Perl_rc));
528 sv_setpv(sv, errno ? Strerror(errno) : "");
532 SvNOK_on(sv); /* what a wonderful hack! */
535 sv_setiv(sv, (IV)uid);
538 sv_setiv(sv, (IV)euid);
541 sv_setiv(sv, (IV)gid);
542 sv_setpvf(sv, "%Vd", (IV)gid);
545 sv_setiv(sv, (IV)egid);
546 sv_setpvf(sv, "%Vd", (IV)egid);
550 Groups_t gary[NGROUPS];
551 i = getgroups(NGROUPS,gary);
553 sv_catpvf(sv, " %Vd", (IV)gary[i]);
556 SvIOK_on(sv); /* what a wonderful hack! */
564 sv_setsv(sv, thr->errsv);
566 #endif /* USE_THREADS */
572 magic_getuvar(SV *sv, MAGIC *mg)
574 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
576 if (uf && uf->uf_val)
577 (*uf->uf_val)(uf->uf_index, sv);
582 magic_setenv(SV *sv, MAGIC *mg)
593 #ifdef DYNAMIC_ENV_FETCH
594 /* We just undefd an environment var. Is a replacement */
595 /* waiting in the wings? */
598 if ((valp = hv_fetch(GvHVn(envgv), ptr, klen, FALSE)))
599 s = SvPV(*valp, len);
603 #if !defined(OS2) && !defined(AMIGAOS) && !defined(WIN32)
604 /* And you'll never guess what the dog had */
605 /* in its mouth... */
607 MgTAINTEDDIR_off(mg);
609 if (s && klen == 8 && strEQ(ptr, "DCL$PATH")) {
610 char pathbuf[256], eltbuf[256], *cp, *elt = s;
614 do { /* DCL$PATH may be a search list */
615 while (1) { /* as may dev portion of any element */
616 if ( ((cp = strchr(elt,'[')) || (cp = strchr(elt,'<'))) ) {
617 if ( *(cp+1) == '.' || *(cp+1) == '-' ||
618 cando_by_name(S_IWUSR,0,elt) ) {
623 if ((cp = strchr(elt, ':')) != Nullch)
625 if (my_trnlnm(elt, eltbuf, j++))
631 } while (my_trnlnm(s, pathbuf, i++) && (elt = pathbuf));
634 if (s && klen == 4 && strEQ(ptr,"PATH")) {
635 char *strend = s + len;
640 s = delimcpy(tmpbuf, tmpbuf + sizeof tmpbuf,
643 if (i >= sizeof tmpbuf /* too long -- assume the worst */
645 || (Stat(tmpbuf, &st) == 0 && (st.st_mode & 2)) ) {
652 #endif /* neither OS2 nor AMIGAOS nor WIN32 */
658 magic_clearenv(SV *sv, MAGIC *mg)
660 my_setenv(MgPV(mg,na),Nullch);
665 magic_set_all_env(SV *sv, MAGIC *mg)
668 die("Can't make list assignment to %%ENV on this system");
673 magic_clear_all_env(sv,mg);
674 hv_iterinit((HV*)sv);
675 while (entry = hv_iternext((HV*)sv)) {
677 my_setenv(hv_iterkey(entry, &keylen),
678 SvPV(hv_iterval((HV*)sv, entry), na));
686 magic_clear_all_env(SV *sv, MAGIC *mg)
689 die("Can't make list assignment to %%ENV on this system");
692 char *envv = GetEnvironmentStrings();
696 char *end = strchr(cur,'=');
697 if (end && end != cur) {
699 my_setenv(cur,Nullch);
701 cur += strlen(end+1)+1;
703 else if ((len = strlen(cur)))
706 FreeEnvironmentStrings(envv);
710 if (environ == origenviron)
711 New(901, environ, 1, char*);
713 for (i = 0; environ[i]; i++)
714 Safefree(environ[i]);
723 magic_getsig(SV *sv, MAGIC *mg)
726 /* Are we fetching a signal entry? */
727 i = whichsig(MgPV(mg,na));
730 sv_setsv(sv,psig_ptr[i]);
732 Sighandler_t sigstate = rsignal_state(i);
734 /* cache state so we don't fetch it again */
735 if(sigstate == SIG_IGN)
736 sv_setpv(sv,"IGNORE");
738 sv_setsv(sv,&sv_undef);
739 psig_ptr[i] = SvREFCNT_inc(sv);
746 magic_clearsig(SV *sv, MAGIC *mg)
749 /* Are we clearing a signal entry? */
750 i = whichsig(MgPV(mg,na));
753 SvREFCNT_dec(psig_ptr[i]);
757 SvREFCNT_dec(psig_name[i]);
765 magic_setsig(SV *sv, MAGIC *mg)
774 if (strEQ(s,"__DIE__"))
776 else if (strEQ(s,"__WARN__"))
778 else if (strEQ(s,"__PARSE__"))
781 croak("No such hook: %s", s);
789 i = whichsig(s); /* ...no, a brick */
791 if (dowarn || strEQ(s,"ALARM"))
792 warn("No such signal: SIG%s", s);
795 SvREFCNT_dec(psig_name[i]);
796 SvREFCNT_dec(psig_ptr[i]);
797 psig_ptr[i] = SvREFCNT_inc(sv);
798 SvTEMP_off(sv); /* Make sure it doesn't go away on us */
799 psig_name[i] = newSVpv(s, strlen(s));
800 SvREADONLY_on(psig_name[i]);
802 if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) {
804 (void)rsignal(i, sighandlerp);
806 *svp = SvREFCNT_inc(sv);
809 s = SvPV_force(sv,na);
810 if (strEQ(s,"IGNORE")) {
812 (void)rsignal(i, SIG_IGN);
816 else if (strEQ(s,"DEFAULT") || !*s) {
818 (void)rsignal(i, SIG_DFL);
824 * We should warn if HINT_STRICT_REFS, but without
825 * access to a known hint bit in a known OP, we can't
826 * tell whether HINT_STRICT_REFS is in force or not.
828 if (!strchr(s,':') && !strchr(s,'\''))
829 sv_setpv(sv, form("main::%s", s));
831 (void)rsignal(i, sighandlerp);
833 *svp = SvREFCNT_inc(sv);
839 magic_setisa(SV *sv, MAGIC *mg)
844 HV *basefields = Nullhv;
848 static char *FIELDS = "FIELDS";
852 if (mg->mg_type == 'i')
853 return 0; /* Ignore lower-case version of the magic */
855 stash = GvSTASH(mg->mg_obj);
856 svp = AvARRAY((AV*)sv);
858 for (fill = AvFILL((AV*)sv); fill >= 0; fill--, svp++) {
859 HV *basestash = gv_stashsv(*svp, FALSE);
863 warn("No such package \"%_\" in @ISA assignment", *svp);
866 gvp = (GV**)hv_fetch(basestash, FIELDS, 6, FALSE);
867 if (gvp && *gvp && GvHV(*gvp)) {
869 croak("Can't multiply inherit %%FIELDS");
870 basefields = GvHV(*gvp);
877 gv = (GV*)*hv_fetch(stash, FIELDS, 6, TRUE);
879 gv_init(gv, stash, FIELDS, 6, TRUE);
882 if (HvKEYS(GvHV(gv)))
883 croak("Inherited %%FIELDS can't override existing %%FIELDS");
885 hv_iterinit(GvHV(gv));
886 while ((he = hv_iternext(basefields)))
887 hv_store(GvHV(gv), HeKEY(he), HeKLEN(he), HeVAL(he), HeHASH(he));
895 magic_setamagic(SV *sv, MAGIC *mg)
897 /* HV_badAMAGIC_on(Sv_STASH(sv)); */
902 #endif /* OVERLOAD */
905 magic_setnkeys(SV *sv, MAGIC *mg)
908 hv_ksplit((HV*)LvTARG(sv), SvIV(sv));
909 LvTARG(sv) = Nullsv; /* Don't allow a ref to reassign this. */
915 magic_methpack(SV *sv, MAGIC *mg, char *meth)
926 PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
927 else if (mg->mg_len == HEf_SVKEY)
928 PUSHs((SV*)mg->mg_ptr);
930 else if (mg->mg_type == 'p')
931 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
934 if (perl_call_method(meth, G_SCALAR))
935 sv_setsv(sv, *stack_sp--);
943 magic_getpack(SV *sv, MAGIC *mg)
945 magic_methpack(sv,mg,"FETCH");
947 mg->mg_flags |= MGf_GSKIP;
952 magic_setpack(SV *sv, MAGIC *mg)
961 PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
962 else if (mg->mg_len == HEf_SVKEY)
963 PUSHs((SV*)mg->mg_ptr);
965 else if (mg->mg_type == 'p')
966 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
970 perl_call_method("STORE", G_SCALAR|G_DISCARD);
976 magic_clearpack(SV *sv, MAGIC *mg)
978 return magic_methpack(sv,mg,"DELETE");
981 int magic_wipepack(SV *sv, MAGIC *mg)
989 perl_call_method("CLEAR", G_SCALAR|G_DISCARD);
995 magic_nextpack(SV *sv, MAGIC *mg, SV *key)
998 char *meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
1009 if (perl_call_method(meth, G_SCALAR))
1010 sv_setsv(key, *stack_sp--);
1018 magic_existspack(SV *sv, MAGIC *mg)
1020 return magic_methpack(sv,mg,"EXISTS");
1024 magic_setdbline(SV *sv, MAGIC *mg)
1034 svp = av_fetch(GvAV(gv),
1035 atoi(MgPV(mg,na)), FALSE);
1036 if (svp && SvIOKp(*svp) && (o = (OP*)SvSTASH(*svp)))
1039 warn("Can't break at that line\n");
1044 magic_getarylen(SV *sv, MAGIC *mg)
1047 sv_setiv(sv, AvFILL((AV*)mg->mg_obj) + curcop->cop_arybase);
1052 magic_setarylen(SV *sv, MAGIC *mg)
1055 av_fill((AV*)mg->mg_obj, SvIV(sv) - curcop->cop_arybase);
1060 magic_getpos(SV *sv, MAGIC *mg)
1062 SV* lsv = LvTARG(sv);
1064 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
1065 mg = mg_find(lsv, 'g');
1066 if (mg && mg->mg_len >= 0) {
1068 sv_setiv(sv, mg->mg_len + curcop->cop_arybase);
1077 magic_setpos(SV *sv, MAGIC *mg)
1079 SV* lsv = LvTARG(sv);
1085 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
1086 mg = mg_find(lsv, 'g');
1090 sv_magic(lsv, (SV*)0, 'g', Nullch, 0);
1091 mg = mg_find(lsv, 'g');
1093 else if (!SvOK(sv)) {
1097 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
1099 WITH_THR(pos = SvIV(sv) - curcop->cop_arybase);
1108 mg->mg_flags &= ~MGf_MINMATCH;
1114 magic_getglob(SV *sv, MAGIC *mg)
1116 if (SvFAKE(sv)) { /* FAKE globs can get coerced */
1118 gv_efullname3(sv,((GV*)sv), "*");
1122 gv_efullname3(sv,((GV*)sv), "*"); /* a gv value, be nice */
1127 magic_setglob(SV *sv, MAGIC *mg)
1135 if (*s == '*' && s[1])
1137 gv = gv_fetchpv(s,TRUE, SVt_PVGV);
1142 GvGP(sv) = gp_ref(GvGP(gv));
1147 magic_setsubstr(SV *sv, MAGIC *mg)
1150 char *tmps = SvPV(sv,len);
1151 sv_insert(LvTARG(sv),LvTARGOFF(sv),LvTARGLEN(sv), tmps, len);
1156 magic_gettaint(SV *sv, MAGIC *mg)
1159 TAINT_IF((mg->mg_len & 1) ||
1160 (mg->mg_len & 2) && mg->mg_obj == sv); /* kludge */
1165 magic_settaint(SV *sv, MAGIC *mg)
1169 if (localizing == 1)
1182 magic_setvec(SV *sv, MAGIC *mg)
1184 do_vecset(sv); /* XXX slurp this routine */
1189 magic_getdefelem(SV *sv, MAGIC *mg)
1192 if (LvTARGLEN(sv)) {
1194 HV* hv = (HV*)LvTARG(sv);
1195 HE* he = hv_fetch_ent(hv, mg->mg_obj, FALSE, 0);
1200 AV* av = (AV*)LvTARG(sv);
1201 if ((I32)LvTARGOFF(sv) <= AvFILL(av))
1202 targ = AvARRAY(av)[LvTARGOFF(sv)];
1204 if (targ && targ != &sv_undef) {
1205 dTHR; /* just for SvREFCNT_dec */
1206 /* somebody else defined it for us */
1207 SvREFCNT_dec(LvTARG(sv));
1208 LvTARG(sv) = SvREFCNT_inc(targ);
1210 SvREFCNT_dec(mg->mg_obj);
1211 mg->mg_obj = Nullsv;
1212 mg->mg_flags &= ~MGf_REFCOUNTED;
1217 sv_setsv(sv, targ ? targ : &sv_undef);
1222 magic_setdefelem(SV *sv, MAGIC *mg)
1227 sv_setsv(LvTARG(sv), sv);
1228 SvSETMAGIC(LvTARG(sv));
1234 magic_freedefelem(SV *sv, MAGIC *mg)
1236 SvREFCNT_dec(LvTARG(sv));
1241 vivify_defelem(SV *sv)
1243 dTHR; /* just for SvREFCNT_inc and SvREFCNT_dec*/
1247 if (!LvTARGLEN(sv) || !(mg = mg_find(sv, 'y')))
1250 HV* hv = (HV*)LvTARG(sv);
1251 HE* he = hv_fetch_ent(hv, mg->mg_obj, TRUE, 0);
1252 if (!he || (value = HeVAL(he)) == &sv_undef)
1253 croak(no_helem, SvPV(mg->mg_obj, na));
1256 AV* av = (AV*)LvTARG(sv);
1257 if ((I32)LvTARGLEN(sv) < 0 && (I32)LvTARGOFF(sv) > AvFILL(av))
1258 LvTARG(sv) = Nullsv; /* array can't be extended */
1260 SV** svp = av_fetch(av, LvTARGOFF(sv), TRUE);
1261 if (!svp || (value = *svp) == &sv_undef)
1262 croak(no_aelem, (I32)LvTARGOFF(sv));
1265 (void)SvREFCNT_inc(value);
1266 SvREFCNT_dec(LvTARG(sv));
1269 SvREFCNT_dec(mg->mg_obj);
1270 mg->mg_obj = Nullsv;
1271 mg->mg_flags &= ~MGf_REFCOUNTED;
1275 magic_setmglob(SV *sv, MAGIC *mg)
1283 magic_setbm(SV *sv, MAGIC *mg)
1285 sv_unmagic(sv, 'B');
1291 magic_setfm(SV *sv, MAGIC *mg)
1293 sv_unmagic(sv, 'f');
1299 magic_setuvar(SV *sv, MAGIC *mg)
1301 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
1303 if (uf && uf->uf_set)
1304 (*uf->uf_set)(uf->uf_index, sv);
1308 #ifdef USE_LOCALE_COLLATE
1310 magic_setcollxfrm(SV *sv, MAGIC *mg)
1313 * René Descartes said "I think not."
1314 * and vanished with a faint plop.
1317 Safefree(mg->mg_ptr);
1323 #endif /* USE_LOCALE_COLLATE */
1326 magic_set(SV *sv, MAGIC *mg)
1332 switch (*mg->mg_ptr) {
1333 case '\001': /* ^A */
1334 sv_setsv(bodytarget, sv);
1336 case '\004': /* ^D */
1337 debug = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) | 0x80000000;
1338 DEBUG_x(dump_all());
1340 case '\005': /* ^E */
1342 set_vaxc_errno(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1344 /* will anyone ever use this? */
1345 SETERRNO(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv), 4);
1348 case '\006': /* ^F */
1349 maxsysfd = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1351 case '\010': /* ^H */
1352 hints = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1358 inplace = savepv(SvPV(sv,na));
1362 case '\017': /* ^O */
1366 osname = savepv(SvPV(sv,na));
1370 case '\020': /* ^P */
1371 perldb = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1373 case '\024': /* ^T */
1375 basetime = (Time_t)(SvNOK(sv) ? SvNVX(sv) : sv_2nv(sv));
1377 basetime = (Time_t)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1380 case '\027': /* ^W */
1381 dowarn = (bool)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1385 if (localizing == 1)
1386 save_sptr((SV**)&last_in_gv);
1388 else if (SvOK(sv) && GvIO(last_in_gv))
1389 IoLINES(GvIOp(last_in_gv)) = (long)SvIV(sv);
1392 Safefree(IoTOP_NAME(GvIOp(defoutgv)));
1393 IoTOP_NAME(GvIOp(defoutgv)) = s = savepv(SvPV(sv,na));
1394 IoTOP_GV(GvIOp(defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO);
1397 Safefree(IoFMT_NAME(GvIOp(defoutgv)));
1398 IoFMT_NAME(GvIOp(defoutgv)) = s = savepv(SvPV(sv,na));
1399 IoFMT_GV(GvIOp(defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO);
1402 IoPAGE_LEN(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1405 IoLINES_LEFT(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1406 if (IoLINES_LEFT(GvIOp(defoutgv)) < 0L)
1407 IoLINES_LEFT(GvIOp(defoutgv)) = 0L;
1410 IoPAGE(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1414 IO *io = GvIOp(defoutgv);
1415 if ((SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) == 0)
1416 IoFLAGS(io) &= ~IOf_FLUSH;
1418 if (!(IoFLAGS(io) & IOf_FLUSH)) {
1419 PerlIO *ofp = IoOFP(io);
1421 (void)PerlIO_flush(ofp);
1422 IoFLAGS(io) |= IOf_FLUSH;
1428 i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1429 multiline = (i != 0);
1435 rs = SvREFCNT_inc(nrs);
1440 if (SvOK(sv) || SvGMAGICAL(sv))
1441 ors = savepv(SvPV(sv,orslen));
1450 ofs = savepv(SvPV(sv, ofslen));
1455 ofmt = savepv(SvPV(sv,na));
1458 compiling.cop_arybase = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1461 #ifdef COMPLEX_STATUS
1462 if (localizing == 2) {
1463 statusvalue = LvTARGOFF(sv);
1464 statusvalue_vms = LvTARGLEN(sv);
1468 #ifdef VMSISH_STATUS
1470 STATUS_NATIVE_SET((U32)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)));
1473 STATUS_POSIX_SET(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1476 SETERRNO(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv),
1477 (SvIV(sv) == EVMSERR) ? 4 : vaxc$errno);
1480 uid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1482 delaymagic |= DM_RUID;
1483 break; /* don't do magic till later */
1486 (void)setruid((Uid_t)uid);
1489 (void)setreuid((Uid_t)uid, (Uid_t)-1);
1491 #ifdef HAS_SETRESUID
1492 (void)setresuid((Uid_t)uid, (Uid_t)-1, (Uid_t)-1);
1494 if (uid == euid) /* special case $< = $> */
1497 uid = (I32)getuid();
1498 croak("setruid() not implemented");
1503 uid = (I32)getuid();
1504 tainting |= (uid && (euid != uid || egid != gid));
1507 euid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1509 delaymagic |= DM_EUID;
1510 break; /* don't do magic till later */
1513 (void)seteuid((Uid_t)euid);
1516 (void)setreuid((Uid_t)-1, (Uid_t)euid);
1518 #ifdef HAS_SETRESUID
1519 (void)setresuid((Uid_t)-1, (Uid_t)euid, (Uid_t)-1);
1521 if (euid == uid) /* special case $> = $< */
1524 euid = (I32)geteuid();
1525 croak("seteuid() not implemented");
1530 euid = (I32)geteuid();
1531 tainting |= (uid && (euid != uid || egid != gid));
1534 gid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1536 delaymagic |= DM_RGID;
1537 break; /* don't do magic till later */
1540 (void)setrgid((Gid_t)gid);
1543 (void)setregid((Gid_t)gid, (Gid_t)-1);
1545 #ifdef HAS_SETRESGID
1546 (void)setresgid((Gid_t)gid, (Gid_t)-1, (Gid_t) 1);
1548 if (gid == egid) /* special case $( = $) */
1551 gid = (I32)getgid();
1552 croak("setrgid() not implemented");
1557 gid = (I32)getgid();
1558 tainting |= (uid && (euid != uid || egid != gid));
1561 #ifdef HAS_SETGROUPS
1563 char *p = SvPV(sv, na);
1564 Groups_t gary[NGROUPS];
1566 SET_NUMERIC_STANDARD();
1569 egid = I_V(atof(p));
1570 for (i = 0; i < NGROUPS; ++i) {
1571 while (*p && !isSPACE(*p))
1577 gary[i] = I_V(atof(p));
1580 (void)setgroups(i, gary);
1582 #else /* HAS_SETGROUPS */
1583 egid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1584 #endif /* HAS_SETGROUPS */
1586 delaymagic |= DM_EGID;
1587 break; /* don't do magic till later */
1590 (void)setegid((Gid_t)egid);
1593 (void)setregid((Gid_t)-1, (Gid_t)egid);
1595 #ifdef HAS_SETRESGID
1596 (void)setresgid((Gid_t)-1, (Gid_t)egid, (Gid_t)-1);
1598 if (egid == gid) /* special case $) = $( */
1601 egid = (I32)getegid();
1602 croak("setegid() not implemented");
1607 egid = (I32)getegid();
1608 tainting |= (uid && (euid != uid || egid != gid));
1611 chopset = SvPV_force(sv,na);
1617 /* See if all the arguments are contiguous in memory */
1618 for (i = 1; i < origargc; i++) {
1619 if (origargv[i] == s + 1
1621 || origargv[i] == s + 2
1624 s += strlen(++s); /* this one is ok too */
1628 /* can grab env area too? */
1629 if (origenviron && (origenviron[0] == s + 1
1631 || (origenviron[0] == s + 9 && (s += 8))
1634 my_setenv("NoNe SuCh", Nullch);
1635 /* force copy of environment */
1636 for (i = 0; origenviron[i]; i++)
1637 if (origenviron[i] == s + 1)
1642 origalen = s - origargv[0];
1644 s = SvPV_force(sv,len);
1646 if (i >= origalen) {
1648 /* don't allow system to limit $0 seen by script */
1649 /* SvCUR_set(sv, i); *SvEND(sv) = '\0'; */
1650 Copy(s, origargv[0], i, char);
1655 Copy(s, origargv[0], i, char);
1658 while (++i < origalen)
1661 for (i = 1; i < origargc; i++)
1662 origargv[i] = Nullch;
1667 sv_setsv(thr->errsv, sv);
1669 #endif /* USE_THREADS */
1676 magic_mutexfree(SV *sv, MAGIC *mg)
1679 DEBUG_L(PerlIO_printf(PerlIO_stderr(), "0x%lx: magic_mutexfree 0x%lx\n",
1680 (unsigned long)thr, (unsigned long)sv);)
1682 croak("panic: magic_mutexfree");
1683 MUTEX_DESTROY(MgMUTEXP(mg));
1684 COND_DESTROY(MgCONDP(mg));
1688 #endif /* USE_THREADS */
1693 register char **sigv;
1695 for (sigv = sig_name+1; *sigv; sigv++)
1696 if (strEQ(sig,*sigv))
1697 return sig_num[sigv - sig_name];
1699 if (strEQ(sig,"CHLD"))
1703 if (strEQ(sig,"CLD"))
1712 unwind_handler_stack(void *p)
1715 U32 flags = *(U32*)p;
1718 savestack_ix -= 5; /* Unprotect save in progress. */
1719 /* cxstack_ix-- Not needed, die already unwound it. */
1721 SvREFCNT_dec(sig_sv);
1735 I32 o_save_i = savestack_ix, type;
1739 if (savestack_ix + 15 <= savestack_max)
1741 if (cxstack_ix < cxstack_max - 2)
1743 if (markstack_ptr < markstack_max - 2)
1745 if (retstack_ix < retstack_max - 2)
1747 if (scopestack_ix < scopestack_max - 3)
1750 if (flags & 2) { /* POPBLOCK may decrease cxstack too early. */
1751 cxstack_ix++; /* Protect from overwrite. */
1752 cx = &cxstack[cxstack_ix];
1753 type = cx->cx_type; /* Can be during partial write. */
1754 cx->cx_type = CXt_NULL; /* Make it safe for unwind. */
1757 die("Signal SIG%s received, but no signal handler set.\n",
1760 /* Max number of items pushed there is 3*n or 4. We cannot fix
1761 infinity, so we fix 4 (in fact 5): */
1763 savestack_ix += 5; /* Protect save in progress. */
1764 o_save_i = savestack_ix;
1765 SAVEDESTRUCTOR(unwind_handler_stack, (void*)&flags);
1768 markstack_ptr++; /* Protect mark. */
1771 retstack[retstack_ix] = NULL;
1775 /* sv_2cv is too complicated, try a simpler variant first: */
1776 if (!SvROK(psig_ptr[sig]) || !(cv = (CV*)SvRV(psig_ptr[sig]))
1777 || SvTYPE(cv) != SVt_PVCV)
1778 cv = sv_2cv(psig_ptr[sig],&st,&gv,TRUE);
1780 if (!cv || !CvROOT(cv)) {
1782 warn("SIG%s handler \"%s\" not defined.\n",
1783 sig_name[sig], GvENAME(gv) );
1787 oldstack = curstack;
1788 if (curstack != signalstack)
1789 AvFILL(signalstack) = 0;
1790 SWITCHSTACK(curstack, signalstack);
1792 if(psig_name[sig]) {
1793 sv = SvREFCNT_inc(psig_name[sig]);
1797 sv = sv_newmortal();
1798 sv_setpv(sv,sig_name[sig]);
1804 perl_call_sv((SV*)cv, G_DISCARD);
1806 SWITCHSTACK(signalstack, oldstack);
1808 savestack_ix -= 8; /* Unprotect save in progress. */
1810 cxstack[cxstack_ix].cx_type = type;
1821 op = myop; /* Apparently not needed... */
1823 Sv = tSv; /* Restore global temporaries. */