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.
30 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
31 MGVTBL* vtbl = mg->mg_virtual;
33 if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
37 if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)) || vtbl->svt_clear)
48 U32 savemagic = SvMAGICAL(sv) | SvREADONLY(sv);
50 assert(SvGMAGICAL(sv));
53 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
55 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
56 MGVTBL* vtbl = mg->mg_virtual;
57 if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
58 (*vtbl->svt_get)(sv, mg);
59 if (mg->mg_flags & MGf_GSKIP)
65 SvFLAGS(sv) |= savemagic;
69 SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK);
80 U32 savemagic = SvMAGICAL(sv);
83 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
85 for (mg = SvMAGIC(sv); mg; mg = nextmg) {
86 MGVTBL* vtbl = mg->mg_virtual;
87 nextmg = mg->mg_moremagic; /* it may delete itself */
88 if (mg->mg_flags & MGf_GSKIP) {
89 mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
92 if (vtbl && vtbl->svt_set)
93 (*vtbl->svt_set)(sv, mg);
98 SvFLAGS(sv) |= savemagic;
102 SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK);
116 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
117 MGVTBL* vtbl = mg->mg_virtual;
118 if (vtbl && vtbl->svt_len) {
119 U32 savemagic = SvMAGICAL(sv);
122 SvFLAGS(sv) |= (SvFLAGS(sv)&(SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
124 /* omit MGf_GSKIP -- not changed here */
125 len = (*vtbl->svt_len)(sv, mg);
127 SvFLAGS(sv) |= savemagic;
129 SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK);
135 junk = SvPV(sv, len);
144 U32 savemagic = SvMAGICAL(sv);
147 SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
149 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
150 MGVTBL* vtbl = mg->mg_virtual;
151 /* omit GSKIP -- never set here */
153 if (vtbl && vtbl->svt_clear)
154 (*vtbl->svt_clear)(sv, mg);
157 SvFLAGS(sv) |= savemagic;
159 SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK);
170 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
171 if (mg->mg_type == type)
178 mg_copy(sv, nsv, key, klen)
186 for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
187 if (isUPPER(mg->mg_type)) {
188 sv_magic(nsv, mg->mg_obj, toLOWER(mg->mg_type), key, klen);
201 for (mg = SvMAGIC(sv); mg; mg = moremagic) {
202 MGVTBL* vtbl = mg->mg_virtual;
203 moremagic = mg->mg_moremagic;
204 if (vtbl && vtbl->svt_free)
205 (*vtbl->svt_free)(sv, mg);
206 if (mg->mg_ptr && mg->mg_type != 'g')
207 Safefree(mg->mg_ptr);
208 if (mg->mg_flags & MGf_REFCOUNTED)
209 SvREFCNT_dec(mg->mg_obj);
216 #if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
230 switch (*mg->mg_ptr) {
231 case '1': case '2': case '3': case '4':
232 case '5': case '6': case '7': case '8': case '9': case '&':
234 paren = atoi(mg->mg_ptr);
236 if (curpm->op_pmregexp &&
237 paren <= curpm->op_pmregexp->nparens &&
238 (s = curpm->op_pmregexp->startp[paren]) &&
239 (t = curpm->op_pmregexp->endp[paren]) ) {
249 paren = curpm->op_pmregexp->lastparen;
258 if (curpm->op_pmregexp &&
259 (s = curpm->op_pmregexp->subbeg) ) {
260 i = curpm->op_pmregexp->startp[0] - s;
268 if (curpm->op_pmregexp &&
269 (s = curpm->op_pmregexp->endp[0]) ) {
270 return (STRLEN) (curpm->op_pmregexp->subend - s);
275 return (STRLEN)ofslen;
277 return (STRLEN)orslen;
280 if (!SvPOK(sv) && SvNIOK(sv))
297 switch (*mg->mg_ptr) {
298 case '\001': /* ^A */
299 sv_setsv(sv, bodytarget);
301 case '\004': /* ^D */
302 sv_setiv(sv,(I32)(debug & 32767));
304 case '\006': /* ^F */
305 sv_setiv(sv,(I32)maxsysfd);
307 case '\010': /* ^H */
308 sv_setiv(sv,(I32)hints);
312 sv_setpv(sv, inplace);
314 sv_setsv(sv,&sv_undef);
316 case '\020': /* ^P */
317 sv_setiv(sv,(I32)perldb);
319 case '\024': /* ^T */
320 sv_setiv(sv,(I32)basetime);
322 case '\027': /* ^W */
323 sv_setiv(sv,(I32)dowarn);
325 case '1': case '2': case '3': case '4':
326 case '5': case '6': case '7': case '8': case '9': case '&':
328 paren = atoi(GvENAME(mg->mg_obj));
330 if (curpm->op_pmregexp &&
331 paren <= curpm->op_pmregexp->nparens &&
332 (s = curpm->op_pmregexp->startp[paren]) &&
333 (t = curpm->op_pmregexp->endp[paren]) ) {
338 if (tainting && (tmg = mg_find(sv,'t')))
339 tmg->mg_len = 0; /* guarantee $1 untainted */
344 sv_setsv(sv,&sv_undef);
348 paren = curpm->op_pmregexp->lastparen;
352 sv_setsv(sv,&sv_undef);
356 if (curpm->op_pmregexp &&
357 (s = curpm->op_pmregexp->subbeg) ) {
358 i = curpm->op_pmregexp->startp[0] - s;
365 sv_setsv(sv,&sv_undef);
369 if (curpm->op_pmregexp &&
370 (s = curpm->op_pmregexp->endp[0]) ) {
371 sv_setpvn(sv,s, curpm->op_pmregexp->subend - s);
375 sv_setsv(sv,&sv_undef);
379 if (GvIO(last_in_gv)) {
380 sv_setiv(sv,(I32)IoLINES(GvIO(last_in_gv)));
385 sv_setiv(sv,(I32)statusvalue);
388 s = IoTOP_NAME(GvIOp(defoutgv));
392 sv_setpv(sv,GvENAME(defoutgv));
397 s = IoFMT_NAME(GvIOp(defoutgv));
399 s = GvENAME(defoutgv);
404 sv_setiv(sv,(I32)IoPAGE_LEN(GvIOp(defoutgv)));
407 sv_setiv(sv,(I32)IoLINES_LEFT(GvIOp(defoutgv)));
410 sv_setiv(sv,(I32)IoPAGE(GvIOp(defoutgv)));
418 sv_setiv(sv,(I32)curcop->cop_arybase);
421 sv_setiv(sv, (IoFLAGS(GvIOp(defoutgv)) & IOf_FLUSH) != 0 );
424 sv_setpvn(sv,ofs,ofslen);
427 sv_setpvn(sv,ors,orslen);
433 sv_setnv(sv,(double)errno);
434 sv_setpv(sv, errno ? Strerror(errno) : "");
435 SvNOK_on(sv); /* what a wonderful hack! */
438 sv_setiv(sv,(I32)uid);
441 sv_setiv(sv,(I32)euid);
445 (void)sprintf(s,"%d",(int)gid);
449 (void)sprintf(s,"%d",(int)egid);
457 Groups_t gary[NGROUPS];
459 i = getgroups(NGROUPS,gary);
461 (void)sprintf(s," %ld", (long)gary[i]);
477 magic_getuvar(sv, mg)
481 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
483 if (uf && uf->uf_val)
484 (*uf->uf_val)(uf->uf_index, sv);
497 my_setenv(mg->mg_ptr,s);
498 #ifdef DYNAMIC_ENV_FETCH
499 /* We just undefd an environment var. Is a replacement */
500 /* waiting in the wings? */
503 if (envsvp = hv_fetch(GvHVn(envgv),mg->mg_ptr,mg->mg_len,FALSE))
504 s = SvPV(*envsvp,len);
507 /* And you'll never guess what the dog had */
508 /* in its mouth... */
510 if (s && strEQ(mg->mg_ptr,"PATH")) {
511 char *strend = s + len;
514 s = cpytill(tokenbuf,s,strend,':',&i);
517 || (Stat(tokenbuf,&statbuf) && (statbuf.st_mode & 2)) )
526 magic_clearenv(sv,mg)
530 my_setenv(mg->mg_ptr,Nullch);
535 /* set up reliable signal() clone */
537 typedef void (*Sigfunc) _((int));
540 Sigfunc rsignal(signo,handler)
544 struct sigaction act,oact;
546 act.sa_handler = handler;
547 sigemptyset(&act.sa_mask);
550 if (signo == SIGALRM) {
555 act.sa_flags |= SA_INTERRUPT; /* SunOS */
559 act.sa_flags |= SA_RESTART; /* SVR4, 4.3+BSD */
562 if (sigaction(signo, &act, &oact) < 0)
565 return(oact.sa_handler);
570 /* ah well, so much for reliability */
572 #define rsignal(x,y) signal(x,y)
588 if (strEQ(s,"__DIE__"))
590 else if (strEQ(s,"__WARN__"))
592 else if (strEQ(s,"__PARSE__"))
595 croak("No such hook: %s", s);
603 i = whichsig(s); /* ...no, a brick */
605 if (dowarn || strEQ(s,"ALARM"))
606 warn("No such signal: SIG%s", s);
610 if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) {
612 (void)rsignal(i,sighandler);
614 *svp = SvREFCNT_inc(sv);
617 s = SvPV_force(sv,na);
618 if (strEQ(s,"IGNORE")) {
620 (void)rsignal(i,SIG_IGN);
624 else if (strEQ(s,"DEFAULT") || !*s) {
626 (void)rsignal(i,SIG_DFL);
631 if (!strchr(s,':') && !strchr(s,'\'')) {
632 sprintf(tokenbuf, "main::%s",s);
633 sv_setpv(sv,tokenbuf);
636 (void)rsignal(i,sighandler);
638 *svp = SvREFCNT_inc(sv);
655 magic_setamagic(sv,mg)
659 /* HV_badAMAGIC_on(Sv_STASH(sv)); */
664 #endif /* OVERLOAD */
667 magic_methpack(sv,mg,meth)
680 PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
681 else if (mg->mg_type == 'p')
682 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
685 if (perl_call_method(meth, G_SCALAR))
686 sv_setsv(sv, *stack_sp--);
698 magic_methpack(sv,mg,"FETCH");
700 mg->mg_flags |= MGf_GSKIP;
715 PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
716 else if (mg->mg_type == 'p')
717 PUSHs(sv_2mortal(newSViv(mg->mg_len)));
721 perl_call_method("STORE", G_SCALAR|G_DISCARD);
727 magic_clearpack(sv,mg)
731 return magic_methpack(sv,mg,"DELETE");
734 int magic_wipepack(sv,mg)
744 perl_call_method("CLEAR", G_SCALAR|G_DISCARD);
750 magic_nextpack(sv,mg,key)
756 char *meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
767 if (perl_call_method(meth, G_SCALAR))
768 sv_setsv(key, *stack_sp--);
776 magic_existspack(sv,mg)
780 return magic_methpack(sv,mg,"EXISTS");
784 magic_setdbline(sv,mg)
795 svp = av_fetch(GvAV(gv),atoi(mg->mg_ptr), FALSE);
796 if (svp && SvIOKp(*svp) && (o = (OP*)SvSTASH(*svp)))
799 warn("Can't break at that line\n");
804 magic_getarylen(sv,mg)
808 sv_setiv(sv, AvFILL((AV*)mg->mg_obj) + curcop->cop_arybase);
813 magic_setarylen(sv,mg)
817 av_fill((AV*)mg->mg_obj, SvIV(sv) - curcop->cop_arybase);
826 SV* lsv = LvTARG(sv);
828 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
829 mg = mg_find(lsv, 'g');
830 if (mg && mg->mg_len >= 0) {
831 sv_setiv(sv, mg->mg_len + curcop->cop_arybase);
844 SV* lsv = LvTARG(sv);
850 if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
851 mg = mg_find(lsv, 'g');
855 sv_magic(lsv, (SV*)0, 'g', Nullch, 0);
856 mg = mg_find(lsv, 'g');
858 else if (!SvOK(sv)) {
862 len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
864 pos = SvIV(sv) - curcop->cop_arybase;
882 gv_efullname(sv,((GV*)sv));/* a gv value, be nice */
897 if (*s == '*' && s[1])
899 gv = gv_fetchpv(s,TRUE, SVt_PVGV);
904 GvGP(sv) = gp_ref(GvGP(gv));
915 magic_setsubstr(sv,mg)
920 char *tmps = SvPV(sv,len);
921 sv_insert(LvTARG(sv),LvTARGOFF(sv),LvTARGLEN(sv), tmps, len);
926 magic_gettaint(sv,mg)
932 else if (mg->mg_len & 2 && mg->mg_obj == sv) /* kludge */
938 magic_settaint(sv,mg)
960 do_vecset(sv); /* XXX slurp this routine */
965 magic_setmglob(sv,mg)
988 struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;
990 if (uf && uf->uf_set)
991 (*uf->uf_set)(uf->uf_index, sv);
1003 switch (*mg->mg_ptr) {
1004 case '\001': /* ^A */
1005 sv_setsv(bodytarget, sv);
1007 case '\004': /* ^D */
1008 debug = (SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) | 0x80000000;
1009 DEBUG_x(dump_all());
1011 case '\006': /* ^F */
1012 maxsysfd = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1014 case '\010': /* ^H */
1015 hints = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1021 inplace = savepv(SvPV(sv,na));
1025 case '\020': /* ^P */
1026 i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1035 case '\024': /* ^T */
1036 basetime = (Time_t)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1038 case '\027': /* ^W */
1039 dowarn = (bool)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1043 if (localizing == 1)
1044 save_sptr((SV**)&last_in_gv);
1047 IoLINES(GvIOp(last_in_gv)) = (long)SvIV(sv);
1050 Safefree(IoTOP_NAME(GvIOp(defoutgv)));
1051 IoTOP_NAME(GvIOp(defoutgv)) = s = savepv(SvPV(sv,na));
1052 IoTOP_GV(GvIOp(defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO);
1055 Safefree(IoFMT_NAME(GvIOp(defoutgv)));
1056 IoFMT_NAME(GvIOp(defoutgv)) = s = savepv(SvPV(sv,na));
1057 IoFMT_GV(GvIOp(defoutgv)) = gv_fetchpv(s,TRUE, SVt_PVIO);
1060 IoPAGE_LEN(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1063 IoLINES_LEFT(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1064 if (IoLINES_LEFT(GvIOp(defoutgv)) < 0L)
1065 IoLINES_LEFT(GvIOp(defoutgv)) = 0L;
1068 IoPAGE(GvIOp(defoutgv)) = (long)(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1071 IoFLAGS(GvIOp(defoutgv)) &= ~IOf_FLUSH;
1072 if ((SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv)) != 0) {
1073 IoFLAGS(GvIOp(defoutgv)) |= IOf_FLUSH;
1077 i = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1078 multiline = (i != 0);
1082 nrs = rs = SvPV_force(sv,rslen);
1084 if (rspara = !rslen) {
1088 nrschar = rschar = rs[rslen - 1];
1091 nrschar = rschar = 0777; /* fake a non-existent char */
1098 ors = savepv(SvPV(sv,orslen));
1103 ofs = savepv(SvPV(sv, ofslen));
1108 ofmt = savepv(SvPV(sv,na));
1111 compiling.cop_arybase = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1114 statusvalue = FIXSTATUS(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv));
1117 SETERRNO(SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv),SS$_ABORT); /* will anyone ever use this? */
1120 uid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1122 delaymagic |= DM_RUID;
1123 break; /* don't do magic till later */
1126 (void)setruid((Uid_t)uid);
1129 (void)setreuid((Uid_t)uid, (Uid_t)-1);
1131 #ifdef HAS_SETRESUID
1132 (void)setresuid((Uid_t)uid, (Uid_t)-1, (Uid_t)-1);
1134 if (uid == euid) /* special case $< = $> */
1137 uid = (I32)getuid();
1138 croak("setruid() not implemented");
1143 uid = (I32)getuid();
1144 tainting |= (uid && (euid != uid || egid != gid));
1147 euid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1149 delaymagic |= DM_EUID;
1150 break; /* don't do magic till later */
1153 (void)seteuid((Uid_t)euid);
1156 (void)setreuid((Uid_t)-1, (Uid_t)euid);
1158 #ifdef HAS_SETRESUID
1159 (void)setresuid((Uid_t)-1, (Uid_t)euid, (Uid_t)-1);
1161 if (euid == uid) /* special case $> = $< */
1164 euid = (I32)geteuid();
1165 croak("seteuid() not implemented");
1170 euid = (I32)geteuid();
1171 tainting |= (uid && (euid != uid || egid != gid));
1174 gid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1176 delaymagic |= DM_RGID;
1177 break; /* don't do magic till later */
1180 (void)setrgid((Gid_t)gid);
1183 (void)setregid((Gid_t)gid, (Gid_t)-1);
1185 #ifdef HAS_SETRESGID
1186 (void)setresgid((Gid_t)gid, (Gid_t)-1, (Gid_t) 1);
1188 if (gid == egid) /* special case $( = $) */
1191 gid = (I32)getgid();
1192 croak("setrgid() not implemented");
1197 gid = (I32)getgid();
1198 tainting |= (uid && (euid != uid || egid != gid));
1201 egid = SvIOK(sv) ? SvIVX(sv) : sv_2iv(sv);
1203 delaymagic |= DM_EGID;
1204 break; /* don't do magic till later */
1207 (void)setegid((Gid_t)egid);
1210 (void)setregid((Gid_t)-1, (Gid_t)egid);
1212 #ifdef HAS_SETRESGID
1213 (void)setresgid((Gid_t)-1, (Gid_t)egid, (Gid_t)-1);
1215 if (egid == gid) /* special case $) = $( */
1218 egid = (I32)getegid();
1219 croak("setegid() not implemented");
1224 egid = (I32)getegid();
1225 tainting |= (uid && (euid != uid || egid != gid));
1228 chopset = SvPV_force(sv,na);
1234 /* See if all the arguments are contiguous in memory */
1235 for (i = 1; i < origargc; i++) {
1236 if (origargv[i] == s + 1)
1237 s += strlen(++s); /* this one is ok too */
1239 if (origenviron[0] == s + 1) { /* can grab env area too? */
1240 my_setenv("NoNeSuCh", Nullch);
1241 /* force copy of environment */
1242 for (i = 0; origenviron[i]; i++)
1243 if (origenviron[i] == s + 1)
1246 origalen = s - origargv[0];
1248 s = SvPV_force(sv,len);
1250 if (i >= origalen) {
1254 Copy(s, origargv[0], i, char);
1257 Copy(s, origargv[0], i, char);
1260 while (++i < origalen)
1263 for (i = 1; i < origargc; i++)
1264 origargv[i] = Nullch;
1275 register char **sigv;
1277 for (sigv = sig_name+1; *sigv; sigv++)
1278 if (strEQ(sig,*sigv))
1279 return sig_num[sigv - sig_name];
1281 if (strEQ(sig,"CHLD"))
1285 if (strEQ(sig,"CLD"))
1303 #ifdef OS2 /* or anybody else who requires SIG_ACK */
1304 signal(sig, SIG_ACK);
1307 signame = sig_name[sig];
1308 cv = sv_2cv(*hv_fetch(GvHVn(siggv),signame,strlen(signame),
1311 if (!cv || !CvROOT(cv) &&
1312 *signame == 'C' && instr(signame,"LD")) {
1314 if (signame[1] == 'H')
1315 cv = sv_2cv(*hv_fetch(GvHVn(siggv),"CLD",3,TRUE),
1318 cv = sv_2cv(*hv_fetch(GvHVn(siggv),"CHLD",4,TRUE),
1322 if (!cv || !CvROOT(cv)) {
1324 warn("SIG%s handler \"%s\" not defined.\n",
1325 signame, GvENAME(gv) );
1330 if (stack != signalstack)
1331 AvFILL(signalstack) = 0;
1332 SWITCHSTACK(stack, signalstack);
1334 sv = sv_newmortal();
1335 sv_setpv(sv,signame);
1340 perl_call_sv((SV*)cv, G_DISCARD);
1342 SWITCHSTACK(signalstack, oldstack);