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)
104 mgs = save_magic(sv);
107 while ((mg = *mgp) != 0) {
108 MGVTBL* vtbl = mg->mg_virtual;
109 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
110 (*vtbl->svt_get)(sv, mg);
111 /* Ignore this magic if it's been deleted */
112 if (*mgp == mg && (mg->mg_flags & MGf_GSKIP))
115 /* Advance to next magic (complicated by possible deletion) */
117 mgp = &mg->mg_moremagic;
133 mgs = save_magic(sv);
135 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
136 MGVTBL* vtbl = mg->mg_virtual;
137 nextmg = mg->mg_moremagic; /* it may delete itself */
138 if (mg->mg_flags & MGf_GSKIP) {
139 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
142 if (vtbl && vtbl->svt_set)
143 (*vtbl->svt_set)(sv, mg);
158 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
159 MGVTBL* vtbl = mg->mg_virtual;
160 if (vtbl && vtbl->svt_len) {
163 /* omit MGf_GSKIP -- not changed here */
164 len = (*vtbl->svt_len)(sv, mg);
170 junk = SvPV(sv, len);
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);
201 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
202 if (mg->mg_type == type)
209 mg_copy(sv, nsv, key, klen)
217 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
218 if (isUPPER(mg->mg_type)) {
219 sv_magic(nsv, mg->mg_obj, toLOWER(mg->mg_type), key, klen);
232 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
233 MGVTBL* vtbl = mg->mg_virtual;
234 moremagic = mg->mg_moremagic;
235 if (vtbl && vtbl->svt_free)
236 (*vtbl->svt_free)(sv, mg);
237 if (mg->mg_ptr && mg->mg_type != 'g')
238 Safefree(mg->mg_ptr);
239 if (mg->mg_flags & MGf_REFCOUNTED)
240 SvREFCNT_dec(mg->mg_obj);
247 #if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
261 switch (*mg->mg_ptr) {
262 case '1': case '2': case '3': case '4':
263 case '5': case '6': case '7': case '8': case '9': case '&':
265 paren = atoi(mg->mg_ptr);
267 if (curpm->op_pmregexp &&
268 paren <= curpm->op_pmregexp->nparens &&
269 (s = curpm->op_pmregexp->startp[paren]) &&
270 (t = curpm->op_pmregexp->endp[paren]) ) {
280 paren = curpm->op_pmregexp->lastparen;
289 if (curpm->op_pmregexp &&
290 (s = curpm->op_pmregexp->subbeg) ) {
291 i = curpm->op_pmregexp->startp[0] - s;
299 if (curpm->op_pmregexp &&
300 (s = curpm->op_pmregexp->endp[0]) ) {
301 return (STRLEN) (curpm->op_pmregexp->subend - s);
306 return (STRLEN)ofslen;
308 return (STRLEN)orslen;
311 if (!SvPOK(sv) && SvNIOK(sv))
328 switch (*mg->mg_ptr) {
329 case '\001': /* ^A */
330 sv_setsv(sv, bodytarget);
332 case '\004': /* ^D */
333 sv_setiv(sv,(I32)(debug & 32767));
335 case '\006': /* ^F */
336 sv_setiv(sv,(I32)maxsysfd);
338 case '\010': /* ^H */
339 sv_setiv(sv,(I32)hints);
343 sv_setpv(sv, inplace);
345 sv_setsv(sv,&sv_undef);
347 case '\020': /* ^P */
348 sv_setiv(sv,(I32)perldb);
350 case '\024': /* ^T */
351 sv_setiv(sv,(I32)basetime);
353 case '\027': /* ^W */
354 sv_setiv(sv,(I32)dowarn);
356 case '1': case '2': case '3': case '4':
357 case '5': case '6': case '7': case '8': case '9': case '&':
359 paren = atoi(GvENAME(mg->mg_obj));
361 if (curpm->op_pmregexp &&
362 paren <= curpm->op_pmregexp->nparens &&
363 (s = curpm->op_pmregexp->startp[paren]) &&
364 (t = curpm->op_pmregexp->endp[paren]) ) {
369 if (tainting && (tmg = mg_find(sv,'t')))
370 tmg->mg_len = 0; /* guarantee $1 untainted */
375 sv_setsv(sv,&sv_undef);
379 paren = curpm->op_pmregexp->lastparen;
383 sv_setsv(sv,&sv_undef);
387 if (curpm->op_pmregexp &&
388 (s = curpm->op_pmregexp->subbeg) ) {
389 i = curpm->op_pmregexp->startp[0] - s;
396 sv_setsv(sv,&sv_undef);
400 if (curpm->op_pmregexp &&
401 (s = curpm->op_pmregexp->endp[0]) ) {
402 sv_setpvn(sv,s, curpm->op_pmregexp->subend - s);
406 sv_setsv(sv,&sv_undef);
410 if (GvIO(last_in_gv)) {
411 sv_setiv(sv,(I32)IoLINES(GvIO(last_in_gv)));
416 sv_setiv(sv,(I32)statusvalue);
419 s = IoTOP_NAME(GvIOp(defoutgv));
423 sv_setpv(sv,GvENAME(defoutgv));
428 s = IoFMT_NAME(GvIOp(defoutgv));
430 s = GvENAME(defoutgv);
435 sv_setiv(sv,(I32)IoPAGE_LEN(GvIOp(defoutgv)));
438 sv_setiv(sv,(I32)IoLINES_LEFT(GvIOp(defoutgv)));
441 sv_setiv(sv,(I32)IoPAGE(GvIOp(defoutgv)));
449 sv_setiv(sv,(I32)curcop->cop_arybase);
452 sv_setiv(sv, (IoFLAGS(GvIOp(defoutgv)) & IOf_FLUSH) != 0 );
455 sv_setpvn(sv,ofs,ofslen);
458 sv_setpvn(sv,ors,orslen);
464 sv_setnv(sv,(double)errno);
465 sv_setpv(sv, errno ? Strerror(errno) : "");
466 SvNOK_on(sv); /* what a wonderful hack! */
469 sv_setiv(sv,(I32)uid);
472 sv_setiv(sv,(I32)euid);
476 (void)sprintf(s,"%d",(int)gid);
480 (void)sprintf(s,"%d",(int)egid);
488 Groups_t gary[NGROUPS];
490 i = getgroups(NGROUPS,gary);
492 (void)sprintf(s," %ld", (long)gary[i]);
508 magic_getuvar(sv, mg)
512 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
514 if (uf && uf->uf_val)
515 (*uf->uf_val)(uf->uf_index, sv);
528 my_setenv(mg->mg_ptr,s);
529 #ifdef DYNAMIC_ENV_FETCH
530 /* We just undefd an environment var. Is a replacement */
531 /* waiting in the wings? */
534 if (envsvp = hv_fetch(GvHVn(envgv),mg->mg_ptr,mg->mg_len,FALSE))
535 s = SvPV(*envsvp,len);
538 /* And you'll never guess what the dog had */
539 /* in its mouth... */
541 if (s && strEQ(mg->mg_ptr,"PATH")) {
542 char *strend = s + len;
545 s = cpytill(tokenbuf,s,strend,':',&i);
548 || (Stat(tokenbuf,&statbuf) && (statbuf.st_mode & 2)) )
557 magic_clearenv(sv,mg)
561 my_setenv(mg->mg_ptr,Nullch);
566 /* set up reliable signal() clone */
568 typedef void (*Sigfunc) _((int));
571 Sigfunc rsignal(signo,handler)
575 struct sigaction act,oact;
577 act.sa_handler = handler;
578 sigemptyset(&act.sa_mask);
581 if (signo == SIGALRM) {
586 act.sa_flags |= SA_INTERRUPT; /* SunOS */
590 act.sa_flags |= SA_RESTART; /* SVR4, 4.3+BSD */
593 if (sigaction(signo, &act, &oact) < 0)
596 return(oact.sa_handler);
601 /* ah well, so much for reliability */
603 #define rsignal(x,y) signal(x,y)
619 if (strEQ(s,"__DIE__"))
621 else if (strEQ(s,"__WARN__"))
623 else if (strEQ(s,"__PARSE__"))
626 croak("No such hook: %s", s);
634 i = whichsig(s); /* ...no, a brick */
636 if (dowarn || strEQ(s,"ALARM"))
637 warn("No such signal: SIG%s", s);
641 if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) {
643 (void)rsignal(i,sighandler);
645 *svp = SvREFCNT_inc(sv);
648 s = SvPV_force(sv,na);
649 if (strEQ(s,"IGNORE")) {
651 (void)rsignal(i,SIG_IGN);
655 else if (strEQ(s,"DEFAULT") || !*s) {
657 (void)rsignal(i,SIG_DFL);
662 if (!strchr(s,':') && !strchr(s,'\'')) {
663 sprintf(tokenbuf, "main::%s",s);
664 sv_setpv(sv,tokenbuf);
667 (void)rsignal(i,sighandler);
669 *svp = SvREFCNT_inc(sv);
686 magic_setamagic(sv,mg)
690 /* HV_badAMAGIC_on(Sv_STASH(sv)); */
695 #endif /* OVERLOAD */
698 magic_methpack(sv,mg,meth)
711 PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
712 else if (mg->mg_type == 'p')
713 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
716 if (perl_call_method(meth, G_SCALAR))
717 sv_setsv(sv, *stack_sp--);
729 magic_methpack(sv,mg,"FETCH");
731 mg->mg_flags |= MGf_GSKIP;
746 PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
747 else if (mg->mg_type == 'p')
748 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
752 perl_call_method("STORE", G_SCALAR|G_DISCARD);
758 magic_clearpack(sv,mg)
762 return magic_methpack(sv,mg,"DELETE");
765 int magic_wipepack(sv,mg)
775 perl_call_method("CLEAR", G_SCALAR|G_DISCARD);
781 magic_nextpack(sv,mg,key)
787 char *meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
798 if (perl_call_method(meth, G_SCALAR))
799 sv_setsv(key, *stack_sp--);
807 magic_existspack(sv,mg)
811 return magic_methpack(sv,mg,"EXISTS");
815 magic_setdbline(sv,mg)
826 svp = av_fetch(GvAV(gv),atoi(mg->mg_ptr), FALSE);
827 if (svp && SvIOKp(*svp) && (o = (OP*)SvSTASH(*svp)))
830 warn("Can't break at that line\n");
835 magic_getarylen(sv,mg)
839 sv_setiv(sv, AvFILL((AV*)mg->mg_obj) + curcop->cop_arybase);
844 magic_setarylen(sv,mg)
848 av_fill((AV*)mg->mg_obj, SvIV(sv) - curcop->cop_arybase);
857 SV* lsv = LvTARG(sv);
859 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
860 mg = mg_find(lsv, 'g');
861 if (mg && mg->mg_len >= 0) {
862 sv_setiv(sv, mg->mg_len + curcop->cop_arybase);
875 SV* lsv = LvTARG(sv);
881 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
882 mg = mg_find(lsv, 'g');
886 sv_magic(lsv, (SV*)0, 'g', Nullch, 0);
887 mg = mg_find(lsv, 'g');
889 else if (!SvOK(sv)) {
893 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
895 pos = SvIV(sv) - curcop->cop_arybase;
913 gv_efullname(sv,((GV*)sv));/* a gv value, be nice */
928 if (*s == '*' && s[1])
930 gv = gv_fetchpv(s,TRUE, SVt_PVGV);
935 GvGP(sv) = gp_ref(GvGP(gv));
946 magic_setsubstr(sv,mg)
951 char *tmps = SvPV(sv,len);
952 sv_insert(LvTARG(sv),LvTARGOFF(sv),LvTARGLEN(sv), tmps, len);
957 magic_gettaint(sv,mg)
963 else if (mg->mg_len & 2 && mg->mg_obj == sv) /* kludge */
969 magic_settaint(sv,mg)
991 do_vecset(sv); /* XXX slurp this routine */
996 magic_setmglob(sv,mg)
1010 sv_unmagic(sv, 'B');
1016 magic_setuvar(sv,mg)
1020 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
1022 if (uf && uf->uf_set)
1023 (*uf->uf_set)(uf->uf_index, sv);
1035 switch (*mg->mg_ptr) {
1036 case '\001': /* ^A */
1037 sv_setsv(bodytarget, sv);
1039 case '\004': /* ^D */
1040 debug = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) | 0x80000000;
1041 DEBUG_x(dump_all());
1043 case '\006': /* ^F */
1044 maxsysfd = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1046 case '\010': /* ^H */
1047 hints = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1053 inplace = savepv(SvPV(sv,na));
1057 case '\020': /* ^P */
1058 i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1067 case '\024': /* ^T */
1068 basetime = (Time_t)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1070 case '\027': /* ^W */
1071 dowarn = (bool)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1075 if (localizing == 1)
1076 save_sptr((SV**)&last_in_gv);
1079 IoLINES(GvIOp(last_in_gv)) = (long)SvIV(sv);
1082 Safefree(IoTOP_NAME(GvIOp(defoutgv)));
1083 IoTOP_NAME(GvIOp(defoutgv)) = s = savepv(SvPV(sv,na));
1084 IoTOP_GV(GvIOp(defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO);
1087 Safefree(IoFMT_NAME(GvIOp(defoutgv)));
1088 IoFMT_NAME(GvIOp(defoutgv)) = s = savepv(SvPV(sv,na));
1089 IoFMT_GV(GvIOp(defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO);
1092 IoPAGE_LEN(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1095 IoLINES_LEFT(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1096 if (IoLINES_LEFT(GvIOp(defoutgv)) < 0L)
1097 IoLINES_LEFT(GvIOp(defoutgv)) = 0L;
1100 IoPAGE(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1103 IoFLAGS(GvIOp(defoutgv)) &= ~IOf_FLUSH;
1104 if ((SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) != 0) {
1105 IoFLAGS(GvIOp(defoutgv)) |= IOf_FLUSH;
1109 i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1110 multiline = (i != 0);
1116 rs = SvREFCNT_inc(nrs);
1121 ors = savepv(SvPV(sv,orslen));
1126 ofs = savepv(SvPV(sv, ofslen));
1131 ofmt = savepv(SvPV(sv,na));
1134 compiling.cop_arybase = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1137 statusvalue = FIXSTATUS(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1140 SETERRNO(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv),SS$_ABORT); /* will anyone ever use this? */
1143 uid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1145 delaymagic |= DM_RUID;
1146 break; /* don't do magic till later */
1149 (void)setruid((Uid_t)uid);
1152 (void)setreuid((Uid_t)uid, (Uid_t)-1);
1154 #ifdef HAS_SETRESUID
1155 (void)setresuid((Uid_t)uid, (Uid_t)-1, (Uid_t)-1);
1157 if (uid == euid) /* special case $< = $> */
1160 uid = (I32)getuid();
1161 croak("setruid() not implemented");
1166 uid = (I32)getuid();
1167 tainting |= (uid && (euid != uid || egid != gid));
1170 euid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1172 delaymagic |= DM_EUID;
1173 break; /* don't do magic till later */
1176 (void)seteuid((Uid_t)euid);
1179 (void)setreuid((Uid_t)-1, (Uid_t)euid);
1181 #ifdef HAS_SETRESUID
1182 (void)setresuid((Uid_t)-1, (Uid_t)euid, (Uid_t)-1);
1184 if (euid == uid) /* special case $> = $< */
1187 euid = (I32)geteuid();
1188 croak("seteuid() not implemented");
1193 euid = (I32)geteuid();
1194 tainting |= (uid && (euid != uid || egid != gid));
1197 gid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1199 delaymagic |= DM_RGID;
1200 break; /* don't do magic till later */
1203 (void)setrgid((Gid_t)gid);
1206 (void)setregid((Gid_t)gid, (Gid_t)-1);
1208 #ifdef HAS_SETRESGID
1209 (void)setresgid((Gid_t)gid, (Gid_t)-1, (Gid_t) 1);
1211 if (gid == egid) /* special case $( = $) */
1214 gid = (I32)getgid();
1215 croak("setrgid() not implemented");
1220 gid = (I32)getgid();
1221 tainting |= (uid && (euid != uid || egid != gid));
1224 egid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1226 delaymagic |= DM_EGID;
1227 break; /* don't do magic till later */
1230 (void)setegid((Gid_t)egid);
1233 (void)setregid((Gid_t)-1, (Gid_t)egid);
1235 #ifdef HAS_SETRESGID
1236 (void)setresgid((Gid_t)-1, (Gid_t)egid, (Gid_t)-1);
1238 if (egid == gid) /* special case $) = $( */
1241 egid = (I32)getegid();
1242 croak("setegid() not implemented");
1247 egid = (I32)getegid();
1248 tainting |= (uid && (euid != uid || egid != gid));
1251 chopset = SvPV_force(sv,na);
1257 /* See if all the arguments are contiguous in memory */
1258 for (i = 1; i < origargc; i++) {
1259 if (origargv[i] == s + 1)
1260 s += strlen(++s); /* this one is ok too */
1262 if (origenviron[0] == s + 1) { /* can grab env area too? */
1263 my_setenv("NoNeSuCh", Nullch);
1264 /* force copy of environment */
1265 for (i = 0; origenviron[i]; i++)
1266 if (origenviron[i] == s + 1)
1269 origalen = s - origargv[0];
1271 s = SvPV_force(sv,len);
1273 if (i >= origalen) {
1277 Copy(s, origargv[0], i, char);
1280 Copy(s, origargv[0], i, char);
1283 while (++i < origalen)
1286 for (i = 1; i < origargc; i++)
1287 origargv[i] = Nullch;
1298 register char **sigv;
1300 for (sigv = sig_name+1; *sigv; sigv++)
1301 if (strEQ(sig,*sigv))
1302 return sig_num[sigv - sig_name];
1304 if (strEQ(sig,"CHLD"))
1308 if (strEQ(sig,"CLD"))
1326 #ifdef OS2 /* or anybody else who requires SIG_ACK */
1327 signal(sig, SIG_ACK);
1330 signame = sig_name[sig];
1331 cv = sv_2cv(*hv_fetch(GvHVn(siggv),signame,strlen(signame),
1334 if (!cv || !CvROOT(cv) &&
1335 *signame == 'C' && instr(signame,"LD")) {
1337 if (signame[1] == 'H')
1338 cv = sv_2cv(*hv_fetch(GvHVn(siggv),"CLD",3,TRUE),
1341 cv = sv_2cv(*hv_fetch(GvHVn(siggv),"CHLD",4,TRUE),
1345 if (!cv || !CvROOT(cv)) {
1347 warn("SIG%s handler \"%s\" not defined.\n",
1348 signame, GvENAME(gv) );
1353 if (stack != signalstack)
1354 AvFILL(signalstack) = 0;
1355 SWITCHSTACK(stack, signalstack);
1357 sv = sv_newmortal();
1358 sv_setpv(sv,signame);
1363 perl_call_sv((SV*)cv, G_DISCARD);
1365 SWITCHSTACK(signalstack, oldstack);