3 * Copyright (c) 1991-1994, 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 /* Omit -- it causes too much grief on mixed systems.
25 * Use the "DESTRUCTOR" scope cleanup to reinstate magic.
32 typedef struct magic_state MGS;
34 static void restore_magic _((void *p));
42 assert(SvMAGICAL(sv));
44 mgs = (MGS*)safemalloc(sizeof(MGS));
46 mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
47 SAVEDESTRUCTOR(restore_magic, mgs);
51 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
63 if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
66 SvFLAGS(sv) |= mgs->mgs_flags;
70 SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK);
82 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
83 MGVTBL* vtbl = mg->mg_virtual;
85 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
89 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)) || vtbl->svt_clear)
103 mgs = save_magic(sv);
105 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
106 MGVTBL* vtbl = mg->mg_virtual;
107 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
108 (*vtbl->svt_get)(sv, mg);
109 if (mg->mg_flags & MGf_GSKIP)
127 mgs = save_magic(sv);
129 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
130 MGVTBL* vtbl = mg->mg_virtual;
131 nextmg = mg->mg_moremagic; /* it may delete itself */
132 if (mg->mg_flags & MGf_GSKIP) {
133 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
136 if (vtbl && vtbl->svt_set)
137 (*vtbl->svt_set)(sv, mg);
152 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
153 MGVTBL* vtbl = mg->mg_virtual;
154 if (vtbl && vtbl->svt_len) {
157 /* omit MGf_GSKIP -- not changed here */
158 len = (*vtbl->svt_len)(sv, mg);
164 junk = SvPV(sv, len);
177 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
178 MGVTBL* vtbl = mg->mg_virtual;
179 /* omit GSKIP -- never set here */
181 if (vtbl && vtbl->svt_clear)
182 (*vtbl->svt_clear)(sv, mg);
195 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
196 if (mg->mg_type == type)
203 mg_copy(sv, nsv, key, 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);
226 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
227 MGVTBL* vtbl = mg->mg_virtual;
228 moremagic = mg->mg_moremagic;
229 if (vtbl && vtbl->svt_free)
230 (*vtbl->svt_free)(sv, mg);
231 if (mg->mg_ptr && mg->mg_type != 'g')
232 Safefree(mg->mg_ptr);
233 if (mg->mg_flags & MGf_REFCOUNTED)
234 SvREFCNT_dec(mg->mg_obj);
241 #if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
255 switch (*mg->mg_ptr) {
256 case '1': case '2': case '3': case '4':
257 case '5': case '6': case '7': case '8': case '9': case '&':
259 paren = atoi(mg->mg_ptr);
261 if (curpm->op_pmregexp &&
262 paren <= curpm->op_pmregexp->nparens &&
263 (s = curpm->op_pmregexp->startp[paren]) &&
264 (t = curpm->op_pmregexp->endp[paren]) ) {
274 paren = curpm->op_pmregexp->lastparen;
283 if (curpm->op_pmregexp &&
284 (s = curpm->op_pmregexp->subbeg) ) {
285 i = curpm->op_pmregexp->startp[0] - s;
293 if (curpm->op_pmregexp &&
294 (s = curpm->op_pmregexp->endp[0]) ) {
295 return (STRLEN) (curpm->op_pmregexp->subend - s);
300 return (STRLEN)ofslen;
302 return (STRLEN)orslen;
305 if (!SvPOK(sv) && SvNIOK(sv))
322 switch (*mg->mg_ptr) {
323 case '\001': /* ^A */
324 sv_setsv(sv, bodytarget);
326 case '\004': /* ^D */
327 sv_setiv(sv,(I32)(debug & 32767));
329 case '\006': /* ^F */
330 sv_setiv(sv,(I32)maxsysfd);
332 case '\010': /* ^H */
333 sv_setiv(sv,(I32)hints);
337 sv_setpv(sv, inplace);
339 sv_setsv(sv,&sv_undef);
341 case '\020': /* ^P */
342 sv_setiv(sv,(I32)perldb);
344 case '\024': /* ^T */
345 sv_setiv(sv,(I32)basetime);
347 case '\027': /* ^W */
348 sv_setiv(sv,(I32)dowarn);
350 case '1': case '2': case '3': case '4':
351 case '5': case '6': case '7': case '8': case '9': case '&':
353 paren = atoi(GvENAME(mg->mg_obj));
355 if (curpm->op_pmregexp &&
356 paren <= curpm->op_pmregexp->nparens &&
357 (s = curpm->op_pmregexp->startp[paren]) &&
358 (t = curpm->op_pmregexp->endp[paren]) ) {
363 if (tainting && (tmg = mg_find(sv,'t')))
364 tmg->mg_len = 0; /* guarantee $1 untainted */
369 sv_setsv(sv,&sv_undef);
373 paren = curpm->op_pmregexp->lastparen;
377 sv_setsv(sv,&sv_undef);
381 if (curpm->op_pmregexp &&
382 (s = curpm->op_pmregexp->subbeg) ) {
383 i = curpm->op_pmregexp->startp[0] - s;
390 sv_setsv(sv,&sv_undef);
394 if (curpm->op_pmregexp &&
395 (s = curpm->op_pmregexp->endp[0]) ) {
396 sv_setpvn(sv,s, curpm->op_pmregexp->subend - s);
400 sv_setsv(sv,&sv_undef);
404 if (GvIO(last_in_gv)) {
405 sv_setiv(sv,(I32)IoLINES(GvIO(last_in_gv)));
410 sv_setiv(sv,(I32)statusvalue);
413 s = IoTOP_NAME(GvIOp(defoutgv));
417 sv_setpv(sv,GvENAME(defoutgv));
422 s = IoFMT_NAME(GvIOp(defoutgv));
424 s = GvENAME(defoutgv);
429 sv_setiv(sv,(I32)IoPAGE_LEN(GvIOp(defoutgv)));
432 sv_setiv(sv,(I32)IoLINES_LEFT(GvIOp(defoutgv)));
435 sv_setiv(sv,(I32)IoPAGE(GvIOp(defoutgv)));
443 sv_setiv(sv,(I32)curcop->cop_arybase);
446 sv_setiv(sv, (IoFLAGS(GvIOp(defoutgv)) & IOf_FLUSH) != 0 );
449 sv_setpvn(sv,ofs,ofslen);
452 sv_setpvn(sv,ors,orslen);
458 sv_setnv(sv,(double)errno);
459 sv_setpv(sv, errno ? Strerror(errno) : "");
460 SvNOK_on(sv); /* what a wonderful hack! */
463 sv_setiv(sv,(I32)uid);
466 sv_setiv(sv,(I32)euid);
470 (void)sprintf(s,"%d",(int)gid);
474 (void)sprintf(s,"%d",(int)egid);
482 Groups_t gary[NGROUPS];
484 i = getgroups(NGROUPS,gary);
486 (void)sprintf(s," %ld", (long)gary[i]);
502 magic_getuvar(sv, mg)
506 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
508 if (uf && uf->uf_val)
509 (*uf->uf_val)(uf->uf_index, sv);
522 my_setenv(mg->mg_ptr,s);
523 #ifdef DYNAMIC_ENV_FETCH
524 /* We just undefd an environment var. Is a replacement */
525 /* waiting in the wings? */
528 if (envsvp = hv_fetch(GvHVn(envgv),mg->mg_ptr,mg->mg_len,FALSE))
529 s = SvPV(*envsvp,len);
532 /* And you'll never guess what the dog had */
533 /* in its mouth... */
535 if (s && strEQ(mg->mg_ptr,"PATH")) {
536 char *strend = s + len;
539 s = cpytill(tokenbuf,s,strend,':',&i);
542 || (Stat(tokenbuf,&statbuf) && (statbuf.st_mode & 2)) )
551 magic_clearenv(sv,mg)
555 my_setenv(mg->mg_ptr,Nullch);
560 /* set up reliable signal() clone */
562 typedef void (*Sigfunc) _((int));
565 Sigfunc rsignal(signo,handler)
569 struct sigaction act,oact;
571 act.sa_handler = handler;
572 sigemptyset(&act.sa_mask);
575 if (signo == SIGALRM) {
580 act.sa_flags |= SA_INTERRUPT; /* SunOS */
584 act.sa_flags |= SA_RESTART; /* SVR4, 4.3+BSD */
587 if (sigaction(signo, &act, &oact) < 0)
590 return(oact.sa_handler);
595 /* ah well, so much for reliability */
597 #define rsignal(x,y) signal(x,y)
613 if (strEQ(s,"__DIE__"))
615 else if (strEQ(s,"__WARN__"))
617 else if (strEQ(s,"__PARSE__"))
620 croak("No such hook: %s", s);
628 i = whichsig(s); /* ...no, a brick */
630 if (dowarn || strEQ(s,"ALARM"))
631 warn("No such signal: SIG%s", s);
635 if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) {
637 (void)rsignal(i,sighandler);
639 *svp = SvREFCNT_inc(sv);
642 s = SvPV_force(sv,na);
643 if (strEQ(s,"IGNORE")) {
645 (void)rsignal(i,SIG_IGN);
649 else if (strEQ(s,"DEFAULT") || !*s) {
651 (void)rsignal(i,SIG_DFL);
656 if (!strchr(s,':') && !strchr(s,'\'')) {
657 sprintf(tokenbuf, "main::%s",s);
658 sv_setpv(sv,tokenbuf);
661 (void)rsignal(i,sighandler);
663 *svp = SvREFCNT_inc(sv);
680 magic_setamagic(sv,mg)
684 /* HV_badAMAGIC_on(Sv_STASH(sv)); */
689 #endif /* OVERLOAD */
692 magic_methpack(sv,mg,meth)
705 PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
706 else if (mg->mg_type == 'p')
707 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
710 if (perl_call_method(meth, G_SCALAR))
711 sv_setsv(sv, *stack_sp--);
723 magic_methpack(sv,mg,"FETCH");
725 mg->mg_flags |= MGf_GSKIP;
740 PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
741 else if (mg->mg_type == 'p')
742 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
746 perl_call_method("STORE", G_SCALAR|G_DISCARD);
752 magic_clearpack(sv,mg)
756 return magic_methpack(sv,mg,"DELETE");
759 int magic_wipepack(sv,mg)
769 perl_call_method("CLEAR", G_SCALAR|G_DISCARD);
775 magic_nextpack(sv,mg,key)
781 char *meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
792 if (perl_call_method(meth, G_SCALAR))
793 sv_setsv(key, *stack_sp--);
801 magic_existspack(sv,mg)
805 return magic_methpack(sv,mg,"EXISTS");
809 magic_setdbline(sv,mg)
820 svp = av_fetch(GvAV(gv),atoi(mg->mg_ptr), FALSE);
821 if (svp && SvIOKp(*svp) && (o = (OP*)SvSTASH(*svp)))
824 warn("Can't break at that line\n");
829 magic_getarylen(sv,mg)
833 sv_setiv(sv, AvFILL((AV*)mg->mg_obj) + curcop->cop_arybase);
838 magic_setarylen(sv,mg)
842 av_fill((AV*)mg->mg_obj, SvIV(sv) - curcop->cop_arybase);
851 SV* lsv = LvTARG(sv);
853 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
854 mg = mg_find(lsv, 'g');
855 if (mg && mg->mg_len >= 0) {
856 sv_setiv(sv, mg->mg_len + curcop->cop_arybase);
869 SV* lsv = LvTARG(sv);
875 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
876 mg = mg_find(lsv, 'g');
880 sv_magic(lsv, (SV*)0, 'g', Nullch, 0);
881 mg = mg_find(lsv, 'g');
883 else if (!SvOK(sv)) {
887 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
889 pos = SvIV(sv) - curcop->cop_arybase;
907 gv_efullname(sv,((GV*)sv));/* a gv value, be nice */
922 if (*s == '*' && s[1])
924 gv = gv_fetchpv(s,TRUE, SVt_PVGV);
929 GvGP(sv) = gp_ref(GvGP(gv));
940 magic_setsubstr(sv,mg)
945 char *tmps = SvPV(sv,len);
946 sv_insert(LvTARG(sv),LvTARGOFF(sv),LvTARGLEN(sv), tmps, len);
951 magic_gettaint(sv,mg)
957 else if (mg->mg_len & 2 && mg->mg_obj == sv) /* kludge */
963 magic_settaint(sv,mg)
985 do_vecset(sv); /* XXX slurp this routine */
990 magic_setmglob(sv,mg)
1003 sv_unmagic(sv, 'B');
1009 magic_setuvar(sv,mg)
1013 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
1015 if (uf && uf->uf_set)
1016 (*uf->uf_set)(uf->uf_index, sv);
1028 switch (*mg->mg_ptr) {
1029 case '\001': /* ^A */
1030 sv_setsv(bodytarget, sv);
1032 case '\004': /* ^D */
1033 debug = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) | 0x80000000;
1034 DEBUG_x(dump_all());
1036 case '\006': /* ^F */
1037 maxsysfd = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1039 case '\010': /* ^H */
1040 hints = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1046 inplace = savepv(SvPV(sv,na));
1050 case '\020': /* ^P */
1051 i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1060 case '\024': /* ^T */
1061 basetime = (Time_t)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1063 case '\027': /* ^W */
1064 dowarn = (bool)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1068 if (localizing == 1)
1069 save_sptr((SV**)&last_in_gv);
1072 IoLINES(GvIOp(last_in_gv)) = (long)SvIV(sv);
1075 Safefree(IoTOP_NAME(GvIOp(defoutgv)));
1076 IoTOP_NAME(GvIOp(defoutgv)) = s = savepv(SvPV(sv,na));
1077 IoTOP_GV(GvIOp(defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO);
1080 Safefree(IoFMT_NAME(GvIOp(defoutgv)));
1081 IoFMT_NAME(GvIOp(defoutgv)) = s = savepv(SvPV(sv,na));
1082 IoFMT_GV(GvIOp(defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO);
1085 IoPAGE_LEN(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1088 IoLINES_LEFT(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1089 if (IoLINES_LEFT(GvIOp(defoutgv)) < 0L)
1090 IoLINES_LEFT(GvIOp(defoutgv)) = 0L;
1093 IoPAGE(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1096 IoFLAGS(GvIOp(defoutgv)) &= ~IOf_FLUSH;
1097 if ((SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) != 0) {
1098 IoFLAGS(GvIOp(defoutgv)) |= IOf_FLUSH;
1102 i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1103 multiline = (i != 0);
1109 rs = SvREFCNT_inc(nrs);
1114 ors = savepv(SvPV(sv,orslen));
1119 ofs = savepv(SvPV(sv, ofslen));
1124 ofmt = savepv(SvPV(sv,na));
1127 compiling.cop_arybase = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1130 statusvalue = FIXSTATUS(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1133 SETERRNO(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv),SS$_ABORT); /* will anyone ever use this? */
1136 uid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1138 delaymagic |= DM_RUID;
1139 break; /* don't do magic till later */
1142 (void)setruid((Uid_t)uid);
1145 (void)setreuid((Uid_t)uid, (Uid_t)-1);
1147 #ifdef HAS_SETRESUID
1148 (void)setresuid((Uid_t)uid, (Uid_t)-1, (Uid_t)-1);
1150 if (uid == euid) /* special case $< = $> */
1153 uid = (I32)getuid();
1154 croak("setruid() not implemented");
1159 uid = (I32)getuid();
1160 tainting |= (uid && (euid != uid || egid != gid));
1163 euid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1165 delaymagic |= DM_EUID;
1166 break; /* don't do magic till later */
1169 (void)seteuid((Uid_t)euid);
1172 (void)setreuid((Uid_t)-1, (Uid_t)euid);
1174 #ifdef HAS_SETRESUID
1175 (void)setresuid((Uid_t)-1, (Uid_t)euid, (Uid_t)-1);
1177 if (euid == uid) /* special case $> = $< */
1180 euid = (I32)geteuid();
1181 croak("seteuid() not implemented");
1186 euid = (I32)geteuid();
1187 tainting |= (uid && (euid != uid || egid != gid));
1190 gid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1192 delaymagic |= DM_RGID;
1193 break; /* don't do magic till later */
1196 (void)setrgid((Gid_t)gid);
1199 (void)setregid((Gid_t)gid, (Gid_t)-1);
1201 #ifdef HAS_SETRESGID
1202 (void)setresgid((Gid_t)gid, (Gid_t)-1, (Gid_t) 1);
1204 if (gid == egid) /* special case $( = $) */
1207 gid = (I32)getgid();
1208 croak("setrgid() not implemented");
1213 gid = (I32)getgid();
1214 tainting |= (uid && (euid != uid || egid != gid));
1217 egid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1219 delaymagic |= DM_EGID;
1220 break; /* don't do magic till later */
1223 (void)setegid((Gid_t)egid);
1226 (void)setregid((Gid_t)-1, (Gid_t)egid);
1228 #ifdef HAS_SETRESGID
1229 (void)setresgid((Gid_t)-1, (Gid_t)egid, (Gid_t)-1);
1231 if (egid == gid) /* special case $) = $( */
1234 egid = (I32)getegid();
1235 croak("setegid() not implemented");
1240 egid = (I32)getegid();
1241 tainting |= (uid && (euid != uid || egid != gid));
1244 chopset = SvPV_force(sv,na);
1250 /* See if all the arguments are contiguous in memory */
1251 for (i = 1; i < origargc; i++) {
1252 if (origargv[i] == s + 1)
1253 s += strlen(++s); /* this one is ok too */
1255 if (origenviron[0] == s + 1) { /* can grab env area too? */
1256 my_setenv("NoNeSuCh", Nullch);
1257 /* force copy of environment */
1258 for (i = 0; origenviron[i]; i++)
1259 if (origenviron[i] == s + 1)
1262 origalen = s - origargv[0];
1264 s = SvPV_force(sv,len);
1266 if (i >= origalen) {
1270 Copy(s, origargv[0], i, char);
1273 Copy(s, origargv[0], i, char);
1276 while (++i < origalen)
1279 for (i = 1; i < origargc; i++)
1280 origargv[i] = Nullch;
1291 register char **sigv;
1293 for (sigv = sig_name+1; *sigv; sigv++)
1294 if (strEQ(sig,*sigv))
1295 return sig_num[sigv - sig_name];
1297 if (strEQ(sig,"CHLD"))
1301 if (strEQ(sig,"CLD"))
1319 #ifdef OS2 /* or anybody else who requires SIG_ACK */
1320 signal(sig, SIG_ACK);
1323 signame = sig_name[sig];
1324 cv = sv_2cv(*hv_fetch(GvHVn(siggv),signame,strlen(signame),
1327 if (!cv || !CvROOT(cv) &&
1328 *signame == 'C' && instr(signame,"LD")) {
1330 if (signame[1] == 'H')
1331 cv = sv_2cv(*hv_fetch(GvHVn(siggv),"CLD",3,TRUE),
1334 cv = sv_2cv(*hv_fetch(GvHVn(siggv),"CHLD",4,TRUE),
1338 if (!cv || !CvROOT(cv)) {
1340 warn("SIG%s handler \"%s\" not defined.\n",
1341 signame, GvENAME(gv) );
1346 if (stack != signalstack)
1347 AvFILL(signalstack) = 0;
1348 SWITCHSTACK(stack, signalstack);
1350 sv = sv_newmortal();
1351 sv_setpv(sv,signame);
1356 perl_call_sv((SV*)cv, G_DISCARD);
1358 SWITCHSTACK(signalstack, oldstack);