[perl5.git] / mg.c

/* $RCSfile: hash.c,v $$Revision: 4.1 $$Date: 92/08/07 18:21:48 $
 *
 *    Copyright (c) 1993, Larry Wall
 *
 *    You may distribute under the terms of either the GNU General Public
 *    License or the Artistic License, as specified in the README file.
 *
 * $Log:        hash.c,v $
 */

#include "EXTERN.h"
#include "perl.h"

int
mg_get(sv)
SV* sv;
{
    MAGIC* mg;
    for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
	MGVTBL* vtbl = mg->mg_virtual;
	if (vtbl && vtbl->svt_get)
	    (*vtbl->svt_get)(sv, mg);
    }
    return 0;
}

int
mg_set(sv)
SV* sv;
{
    MAGIC* mg;
    for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
	MGVTBL* vtbl = mg->mg_virtual;
	if (vtbl && vtbl->svt_set)
	    (*vtbl->svt_set)(sv, mg);
    }
    return 0;
}

U32
mg_len(sv)
SV* sv;
{
    MAGIC* mg;
    for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
	MGVTBL* vtbl = mg->mg_virtual;
	if (vtbl && vtbl->svt_len)
	    return (*vtbl->svt_len)(sv, mg);
    }
    mg_get(sv);
    if (!SvPOK(sv) && SvNIOK(sv))
	sv_2pv(sv);
    if (SvPOK(sv))
	return SvCUR(sv);
    return 0;
}

int
mg_clear(sv)
SV* sv;
{
    MAGIC* mg;
    for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
	MGVTBL* vtbl = mg->mg_virtual;
	if (vtbl && vtbl->svt_clear)
	    (*vtbl->svt_clear)(sv, mg);
    }
    return 0;
}

MAGIC*
mg_find(sv, type)
SV* sv;
char type;
{
    MAGIC* mg;
    MAGIC** mgp = &SvMAGIC(sv);
    for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
	if (mg->mg_type == type)
	    return mg;
    }
    return 0;
}

int
mg_free(sv, type)
SV* sv;
char type;
{
    MAGIC* mg;
    MAGIC** mgp = &SvMAGIC(sv);
    for (mg = *mgp; mg; mg = *mgp) {
	if (mg->mg_type == type) {
	    MGVTBL* vtbl = mg->mg_virtual;
	    *mgp = mg->mg_moremagic;
	    if (vtbl && vtbl->svt_free)
		(*vtbl->svt_free)(sv, mg);
	    if (mg->mg_ptr && mg->mg_type != 'g')
		Safefree(mg->mg_ptr);
	    Safefree(mg);
	}
	else
	    mgp = &mg->mg_moremagic;
    }
    return 0;
}

int
mg_freeall(sv)
SV* sv;
{
    MAGIC* mg;
    MAGIC* moremagic;
    for (mg = SvMAGIC(sv); mg; mg = moremagic) {
	MGVTBL* vtbl = mg->mg_virtual;
	moremagic = mg->mg_moremagic;
	if (vtbl && vtbl->svt_free)
	    (*vtbl->svt_free)(sv, mg);
	if (mg->mg_ptr && mg->mg_type != 'g')
	    Safefree(mg->mg_ptr);
	Safefree(mg);
    }
    SvMAGIC(sv) = 0;
    return 0;
}

#if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
#include <signal.h>
#endif

#ifdef VOIDSIG
#define handlertype void
#else
#define handlertype int
#endif

static handlertype sighandler();

U32
magic_len(sv, mg)
SV *sv;
MAGIC *mg;
{
    register I32 paren;
    register char *s;
    register I32 i;

    switch (*mg->mg_ptr) {
    case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9': case '&':
	if (curpm) {
	    paren = atoi(mg->mg_ptr);
	  getparen:
	    if (curpm->op_pmregexp &&
	      paren <= curpm->op_pmregexp->nparens &&
	      (s = curpm->op_pmregexp->startp[paren]) ) {
		i = curpm->op_pmregexp->endp[paren] - s;
		if (i >= 0)
		    return i;
		else
		    return 0;
	    }
	    else
		return 0;
	}
	break;
    case '+':
	if (curpm) {
	    paren = curpm->op_pmregexp->lastparen;
	    goto getparen;
	}
	break;
    case '`':
	if (curpm) {
	    if (curpm->op_pmregexp &&
	      (s = curpm->op_pmregexp->subbeg) ) {
		i = curpm->op_pmregexp->startp[0] - s;
		if (i >= 0)
		    return i;
		else
		    return 0;
	    }
	    else
		return 0;
	}
	break;
    case '\'':
	if (curpm) {
	    if (curpm->op_pmregexp &&
	      (s = curpm->op_pmregexp->endp[0]) ) {
		return (STRLEN) (curpm->op_pmregexp->subend - s);
	    }
	    else
		return 0;
	}
	break;
    case ',':
	return (STRLEN)ofslen;
    case '\\':
	return (STRLEN)orslen;
    }
    magic_get(sv,mg);
    if (!SvPOK(sv) && SvNIOK(sv))
	sv_2pv(sv);
    if (SvPOK(sv))
	return SvCUR(sv);
    return 0;
}

int
magic_get(sv, mg)
SV *sv;
MAGIC *mg;
{
    register I32 paren;
    register char *s;
    register I32 i;

    switch (*mg->mg_ptr) {
    case '\004':		/* ^D */
	sv_setiv(sv,(I32)(debug & 32767));
	break;
    case '\006':		/* ^F */
	sv_setiv(sv,(I32)maxsysfd);
	break;
    case '\t':			/* ^I */
	if (inplace)
	    sv_setpv(sv, inplace);
	else
	    sv_setsv(sv,&sv_undef);
	break;
    case '\020':		/* ^P */
	sv_setiv(sv,(I32)perldb);
	break;
    case '\024':		/* ^T */
	sv_setiv(sv,(I32)basetime);
	break;
    case '\027':		/* ^W */
	sv_setiv(sv,(I32)dowarn);
	break;
    case '1': case '2': case '3': case '4':
    case '5': case '6': case '7': case '8': case '9': case '&':
	if (curpm) {
	    paren = atoi(GvENAME(mg->mg_obj));
	  getparen:
	    if (curpm->op_pmregexp &&
	      paren <= curpm->op_pmregexp->nparens &&
	      (s = curpm->op_pmregexp->startp[paren]) ) {
		i = curpm->op_pmregexp->endp[paren] - s;
		if (i >= 0)
		    sv_setpvn(sv,s,i);
		else
		    sv_setsv(sv,&sv_undef);
	    }
	    else
		sv_setsv(sv,&sv_undef);
	}
	break;
    case '+':
	if (curpm) {
	    paren = curpm->op_pmregexp->lastparen;
	    goto getparen;
	}
	break;
    case '`':
	if (curpm) {
	    if (curpm->op_pmregexp &&
	      (s = curpm->op_pmregexp->subbeg) ) {
		i = curpm->op_pmregexp->startp[0] - s;
		if (i >= 0)
		    sv_setpvn(sv,s,i);
		else
		    sv_setpvn(sv,"",0);
	    }
	    else
		sv_setpvn(sv,"",0);
	}
	break;
    case '\'':
	if (curpm) {
	    if (curpm->op_pmregexp &&
	      (s = curpm->op_pmregexp->endp[0]) ) {
		sv_setpvn(sv,s, curpm->op_pmregexp->subend - s);
	    }
	    else
		sv_setpvn(sv,"",0);
	}
	break;
    case '.':
#ifndef lint
	if (last_in_gv && GvIO(last_in_gv)) {
	    sv_setiv(sv,(I32)GvIO(last_in_gv)->lines);
	}
#endif
	break;
    case '?':
	sv_setiv(sv,(I32)statusvalue);
	break;
    case '^':
	s = GvIO(defoutgv)->top_name;
	if (s)
	    sv_setpv(sv,s);
	else {
	    sv_setpv(sv,GvENAME(defoutgv));
	    sv_catpv(sv,"_TOP");
	}
	break;
    case '~':
	s = GvIO(defoutgv)->fmt_name;
	if (!s)
	    s = GvENAME(defoutgv);
	sv_setpv(sv,s);
	break;
#ifndef lint
    case '=':
	sv_setiv(sv,(I32)GvIO(defoutgv)->page_len);
	break;
    case '-':
	sv_setiv(sv,(I32)GvIO(defoutgv)->lines_left);
	break;
    case '%':
	sv_setiv(sv,(I32)GvIO(defoutgv)->page);
	break;
#endif
    case ':':
	break;
    case '/':
	break;
    case '[':
	sv_setiv(sv,(I32)arybase);
	break;
    case '|':
	if (!GvIO(defoutgv))
	    GvIO(defoutgv) = newIO();
	sv_setiv(sv, (GvIO(defoutgv)->flags & IOf_FLUSH) != 0 );
	break;
    case ',':
	sv_setpvn(sv,ofs,ofslen);
	break;
    case '\\':
	sv_setpvn(sv,ors,orslen);
	break;
    case '#':
	sv_setpv(sv,ofmt);
	break;
    case '!':
	sv_setnv(sv,(double)errno);
	sv_setpv(sv, errno ? strerror(errno) : "");
	SvNOK_on(sv);	/* what a wonderful hack! */
	break;
    case '<':
	sv_setiv(sv,(I32)uid);
	break;
    case '>':
	sv_setiv(sv,(I32)euid);
	break;
    case '(':
	s = buf;
	(void)sprintf(s,"%d",(int)gid);
	goto add_groups;
    case ')':
	s = buf;
	(void)sprintf(s,"%d",(int)egid);
      add_groups:
	while (*s) s++;
#ifdef HAS_GETGROUPS
#ifndef NGROUPS
#define NGROUPS 32
#endif
	{
	    GROUPSTYPE gary[NGROUPS];

	    i = getgroups(NGROUPS,gary);
	    while (--i >= 0) {
		(void)sprintf(s," %ld", (long)gary[i]);
		while (*s) s++;
	    }
	}
#endif
	sv_setpv(sv,buf);
	break;
    case '*':
	break;
    case '0':
	break;
    }
}

int
magic_getuvar(sv, mg)
SV *sv;
MAGIC *mg;
{
    struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;

    if (uf && uf->uf_val)
	(*uf->uf_val)(uf->uf_index, sv);
    return 0;
}

int
magic_setenv(sv,mg)
SV* sv;
MAGIC* mg;
{
    register char *s;
    I32 i;
    s = SvPV(sv);
    my_setenv(mg->mg_ptr,s);
			    /* And you'll never guess what the dog had */
			    /*   in its mouth... */
#ifdef TAINT
    if (s && strEQ(mg->mg_ptr,"PATH")) {
	char *strend = SvEND(sv);

	while (s < strend) {
	    s = cpytill(tokenbuf,s,strend,':',&i);
	    s++;
	    if (*tokenbuf != '/'
	      || (stat(tokenbuf,&statbuf) && (statbuf.st_mode & 2)) )
		sv->sv_tainted = 2;
	}
    }
#endif
    return 0;
}

int
magic_setsig(sv,mg)
SV* sv;
MAGIC* mg;
{
    register char *s;
    I32 i;
    s = SvPV(sv);
    i = whichsig(mg->mg_ptr);	/* ...no, a brick */
    if (!i && (dowarn || strEQ(mg->mg_ptr,"ALARM")))
	warn("No such signal: SIG%s", mg->mg_ptr);
    if (strEQ(s,"IGNORE"))
#ifndef lint
	(void)signal(i,SIG_IGN);
#else
	;
#endif
    else if (strEQ(s,"DEFAULT") || !*s)
	(void)signal(i,SIG_DFL);
    else {
	(void)signal(i,sighandler);
	if (!strchr(s,'\'')) {
	    sprintf(tokenbuf, "main'%s",s);
	    sv_setpv(sv,tokenbuf);
	}
    }
    return 0;
}

int
magic_setdbm(sv,mg)
SV* sv;
MAGIC* mg;
{
    HV* hv = (HV*)mg->mg_obj;
    hv_dbmstore(hv,mg->mg_ptr,mg->mg_len,sv);	/* XXX slurp? */
    return 0;
}

int
magic_setdbline(sv,mg)
SV* sv;
MAGIC* mg;
{
    OP *o;
    I32 i;
    GV* gv;
    SV** svp;

    gv = DBline;
    i = SvTRUE(sv);
    svp = av_fetch(GvAV(gv),atoi(mg->mg_ptr), FALSE);
    if (svp && SvIOK(*svp) && (o = (OP*)SvSTASH(*svp)))
	o->op_private = i;
    else
	warn("Can't break at that line\n");
    return 0;
}

int
magic_getarylen(sv,mg)
SV* sv;
MAGIC* mg;
{
    sv_setiv(sv, AvFILL((AV*)mg->mg_obj) + arybase);
    return 0;
}

int
magic_setarylen(sv,mg)
SV* sv;
MAGIC* mg;
{
    av_fill((AV*)mg->mg_obj, (SvIOK(sv) ? SvIV(sv) : sv_2iv(sv)) - arybase);
    return 0;
}

int
magic_getglob(sv,mg)
SV* sv;
MAGIC* mg;
{
    gv_efullname(sv,((GV*)sv));/* a gv value, be nice */
    return 0;
}

int
magic_setglob(sv,mg)
SV* sv;
MAGIC* mg;
{
    register char *s;
    GV* gv;

    if (!SvOK(sv))
	return 0;
    s = SvPOK(sv) ? SvPV(sv) : sv_2pv(sv);
    if (*s == '*' && s[1])
	s++;
    gv = gv_fetchpv(s,TRUE);
    if (sv == (SV*)gv)
	return 0;
    if (GvGP(sv))
	gp_free(sv);
    GvGP(sv) = gp_ref(GvGP(gv));
    if (!GvAV(gv))
	gv_AVadd(gv);
    if (!GvHV(gv))
	gv_HVadd(gv);
    if (!GvIO(gv))
	GvIO(gv) = newIO();
    return 0;
}

int
magic_setsubstr(sv,mg)
SV* sv;
MAGIC* mg;
{
    char *tmps = SvPV(sv);
    if (!tmps)
	tmps = "";
    sv_insert(LvTARG(sv),LvTARGOFF(sv),LvTARGLEN(sv), tmps,SvCUR(sv));
    return 0;
}

int
magic_setvec(sv,mg)
SV* sv;
MAGIC* mg;
{
    do_vecset(sv);	/* XXX slurp this routine */
    return 0;
}

int
magic_setmglob(sv,mg)
SV* sv;
MAGIC* mg;
{
    mg->mg_ptr = 0;
    mg->mg_len = 0;
    return 0;
}

int
magic_setbm(sv,mg)
SV* sv;
MAGIC* mg;
{
    mg_free(sv, 'B');
    SvVALID_off(sv);
    return 0;
}

int
magic_setuvar(sv,mg)
SV* sv;
MAGIC* mg;
{
    struct ufuncs *uf = (struct ufuncs *)mg->mg_ptr;

    if (uf && uf->uf_set)
	(*uf->uf_set)(uf->uf_index, sv);
    return 0;
}

int
magic_set(sv,mg)
SV* sv;
MAGIC* mg;
{
    register char *s;
    I32 i;
    switch (*mg->mg_ptr) {
    case '\004':	/* ^D */
	debug = (SvIOK(sv) ? SvIV(sv) : sv_2iv(sv)) | 32768;
	DEBUG_x(dump_all());
	break;
    case '\006':	/* ^F */
	maxsysfd = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	break;
    case '\t':	/* ^I */
	if (inplace)
	    Safefree(inplace);
	if (SvOK(sv))
	    inplace = savestr(SvPV(sv));
	else
	    inplace = Nullch;
	break;
    case '\020':	/* ^P */
	i = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	if (i != perldb) {
	    if (perldb)
		oldlastpm = curpm;
	    else
		curpm = oldlastpm;
	}
	perldb = i;
	break;
    case '\024':	/* ^T */
	basetime = (time_t)(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
	break;
    case '\027':	/* ^W */
	dowarn = (bool)(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
	break;
    case '.':
	if (localizing)
	    save_sptr((SV**)&last_in_gv);
	break;
    case '^':
	Safefree(GvIO(defoutgv)->top_name);
	GvIO(defoutgv)->top_name = s = savestr(SvPV(sv));
	GvIO(defoutgv)->top_gv = gv_fetchpv(s,TRUE);
	break;
    case '~':
	Safefree(GvIO(defoutgv)->fmt_name);
	GvIO(defoutgv)->fmt_name = s = savestr(SvPV(sv));
	GvIO(defoutgv)->fmt_gv = gv_fetchpv(s,TRUE);
	break;
    case '=':
	GvIO(defoutgv)->page_len = (long)(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
	break;
    case '-':
	GvIO(defoutgv)->lines_left = (long)(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
	if (GvIO(defoutgv)->lines_left < 0L)
	    GvIO(defoutgv)->lines_left = 0L;
	break;
    case '%':
	GvIO(defoutgv)->page = (long)(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
	break;
    case '|':
	if (!GvIO(defoutgv))
	    GvIO(defoutgv) = newIO();
	GvIO(defoutgv)->flags &= ~IOf_FLUSH;
	if ((SvIOK(sv) ? SvIV(sv) : sv_2iv(sv)) != 0) {
	    GvIO(defoutgv)->flags |= IOf_FLUSH;
	}
	break;
    case '*':
	i = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	multiline = (i != 0);
	break;
    case '/':
	if (SvPOK(sv)) {
	    nrs = rs = SvPV(sv);
	    nrslen = rslen = SvCUR(sv);
	    if (rspara = !rslen) {
		nrs = rs = "\n\n";
		nrslen = rslen = 2;
	    }
	    nrschar = rschar = rs[rslen - 1];
	}
	else {
	    nrschar = rschar = 0777;	/* fake a non-existent char */
	    nrslen = rslen = 1;
	}
	break;
    case '\\':
	if (ors)
	    Safefree(ors);
	ors = savestr(SvPV(sv));
	orslen = SvCUR(sv);
	break;
    case ',':
	if (ofs)
	    Safefree(ofs);
	ofs = savestr(SvPV(sv));
	ofslen = SvCUR(sv);
	break;
    case '#':
	if (ofmt)
	    Safefree(ofmt);
	ofmt = savestr(SvPV(sv));
	break;
    case '[':
	arybase = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	break;
    case '?':
	statusvalue = U_S(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
	break;
    case '!':
	errno = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);		/* will anyone ever use this? */
	break;
    case '<':
	uid = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	if (delaymagic) {
	    delaymagic |= DM_RUID;
	    break;				/* don't do magic till later */
	}
#ifdef HAS_SETRUID
	(void)setruid((UIDTYPE)uid);
#else
#ifdef HAS_SETREUID
	(void)setreuid((UIDTYPE)uid, (UIDTYPE)-1);
#else
	if (uid == euid)		/* special case $< = $> */
	    (void)setuid(uid);
	else
	    fatal("setruid() not implemented");
#endif
#endif
	uid = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	break;
    case '>':
	euid = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	if (delaymagic) {
	    delaymagic |= DM_EUID;
	    break;				/* don't do magic till later */
	}
#ifdef HAS_SETEUID
	(void)seteuid((UIDTYPE)euid);
#else
#ifdef HAS_SETREUID
	(void)setreuid((UIDTYPE)-1, (UIDTYPE)euid);
#else
	if (euid == uid)		/* special case $> = $< */
	    setuid(euid);
	else
	    fatal("seteuid() not implemented");
#endif
#endif
	euid = (I32)geteuid();
	break;
    case '(':
	gid = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	if (delaymagic) {
	    delaymagic |= DM_RGID;
	    break;				/* don't do magic till later */
	}
#ifdef HAS_SETRGID
	(void)setrgid((GIDTYPE)gid);
#else
#ifdef HAS_SETREGID
	(void)setregid((GIDTYPE)gid, (GIDTYPE)-1);
#else
	if (gid == egid)			/* special case $( = $) */
	    (void)setgid(gid);
	else
	    fatal("setrgid() not implemented");
#endif
#endif
	gid = (I32)getgid();
	break;
    case ')':
	egid = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	if (delaymagic) {
	    delaymagic |= DM_EGID;
	    break;				/* don't do magic till later */
	}
#ifdef HAS_SETEGID
	(void)setegid((GIDTYPE)egid);
#else
#ifdef HAS_SETREGID
	(void)setregid((GIDTYPE)-1, (GIDTYPE)egid);
#else
	if (egid == gid)			/* special case $) = $( */
	    (void)setgid(egid);
	else
	    fatal("setegid() not implemented");
#endif
#endif
	egid = (I32)getegid();
	break;
    case ':':
	chopset = SvPV(sv);
	break;
    case '0':
	if (!origalen) {
	    s = origargv[0];
	    s += strlen(s);
	    /* See if all the arguments are contiguous in memory */
	    for (i = 1; i < origargc; i++) {
		if (origargv[i] == s + 1)
		    s += strlen(++s);	/* this one is ok too */
	    }
	    if (origenviron[0] == s + 1) {	/* can grab env area too? */
		my_setenv("NoNeSuCh", Nullch);
					    /* force copy of environment */
		for (i = 0; origenviron[i]; i++)
		    if (origenviron[i] == s + 1)
			s += strlen(++s);
	    }
	    origalen = s - origargv[0];
	}
	s = SvPV(sv);
	i = SvCUR(sv);
	if (i >= origalen) {
	    i = origalen;
	    SvCUR_set(sv, i);
	    *SvEND(sv) = '\0';
	    Copy(s, origargv[0], i, char);
	}
	else {
	    Copy(s, origargv[0], i, char);
	    s = origargv[0]+i;
	    *s++ = '\0';
	    while (++i < origalen)
		*s++ = ' ';
	}
	break;
    }
    return 0;
}

I32
whichsig(sig)
char *sig;
{
    register char **sigv;

    for (sigv = sig_name+1; *sigv; sigv++)
	if (strEQ(sig,*sigv))
	    return sigv - sig_name;
#ifdef SIGCLD
    if (strEQ(sig,"CHLD"))
	return SIGCLD;
#endif
#ifdef SIGCHLD
    if (strEQ(sig,"CLD"))
	return SIGCHLD;
#endif
    return 0;
}

static handlertype
sighandler(sig)
I32 sig;
{
    dSP;
    GV *gv;
    SV *sv;
    CV *cv;
    CONTEXT *cx;
    AV *oldstack;
    I32 hasargs = 1;
    I32 items = 1;
    I32 gimme = G_SCALAR;

#ifdef OS2		/* or anybody else who requires SIG_ACK */
    signal(sig, SIG_ACK);
#endif

    gv = gv_fetchpv(
	SvPVnx(*hv_fetch(GvHVn(siggv),sig_name[sig],strlen(sig_name[sig]),
	  TRUE)), TRUE);
    cv = GvCV(gv);
    if (!cv && *sig_name[sig] == 'C' && instr(sig_name[sig],"LD")) {
	if (sig_name[sig][1] == 'H')
	    gv = gv_fetchpv(SvPVnx(*hv_fetch(GvHVn(siggv),"CLD",3,TRUE)),
	      TRUE);
	else
	    gv = gv_fetchpv(SvPVnx(*hv_fetch(GvHVn(siggv),"CHLD",4,TRUE)),
	      TRUE);
	cv = GvCV(gv);	/* gag */
    }
    if (!cv) {
	if (dowarn)
	    warn("SIG%s handler \"%s\" not defined.\n",
		sig_name[sig], GvENAME(gv) );
	return;
    }

    oldstack = stack;
    SWITCHSTACK(stack, signalstack);

    sv = sv_mortalcopy(&sv_undef);
    sv_setpv(sv,sig_name[sig]);
    PUSHs(sv);

    ENTER;
    SAVETMPS;

    push_return(op);
    push_return(0);
    PUSHBLOCK(cx, CXt_SUB, sp);
    PUSHSUB(cx);
    cx->blk_sub.savearray = GvAV(defgv);
    cx->blk_sub.argarray = av_fake(items, sp);
    GvAV(defgv) = cx->blk_sub.argarray;
    CvDEPTH(cv)++;
    if (CvDEPTH(cv) >= 2) {
	if (CvDEPTH(cv) == 100 && dowarn)
	    warn("Deep recursion on subroutine \"%s\"",GvENAME(gv));
    }
    op = CvSTART(cv);
    PUTBACK;
    run();		/* Does the LEAVE for us. */

    SWITCHSTACK(signalstack, oldstack);
    op = pop_return();

    return;
}
Commit	Line	Data
79072805 LW	1	/* $RCSfile: hash.c,v $$Revision: 4.1 $$Date: 92/08/07 18:21:48 $
	2	*
	3	* Copyright (c) 1993, Larry Wall
	4	*
	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.
	7	*
	8	* $Log: hash.c,v $
	9	*/
	10
	11	#include "EXTERN.h"
	12	#include "perl.h"
	13
	14	int
	15	mg_get(sv)
	16	SV* sv;
	17	{
	18	MAGIC* mg;
	19	for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
	20	MGVTBL* vtbl = mg->mg_virtual;
	21	if (vtbl && vtbl->svt_get)
	22	(*vtbl->svt_get)(sv, mg);
	23	}
	24	return 0;
	25	}
	26
	27	int
	28	mg_set(sv)
	29	SV* sv;
	30	{
	31	MAGIC* mg;
	32	for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
	33	MGVTBL* vtbl = mg->mg_virtual;
	34	if (vtbl && vtbl->svt_set)
	35	(*vtbl->svt_set)(sv, mg);
	36	}
	37	return 0;
	38	}
	39
	40	U32
	41	mg_len(sv)
	42	SV* sv;
	43	{
	44	MAGIC* mg;
	45	for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
	46	MGVTBL* vtbl = mg->mg_virtual;
	47	if (vtbl && vtbl->svt_len)
	48	return (*vtbl->svt_len)(sv, mg);
	49	}
93a17b20	50	mg_get(sv);
79072805 LW	51	if (!SvPOK(sv) && SvNIOK(sv))
	52	sv_2pv(sv);
	53	if (SvPOK(sv))
	54	return SvCUR(sv);
	55	return 0;
	56	}
	57
	58	int
	59	mg_clear(sv)
	60	SV* sv;
	61	{
	62	MAGIC* mg;
	63	for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
	64	MGVTBL* vtbl = mg->mg_virtual;
	65	if (vtbl && vtbl->svt_clear)
	66	(*vtbl->svt_clear)(sv, mg);
	67	}
	68	return 0;
	69	}
	70
93a17b20 LW	71	MAGIC*
	72	mg_find(sv, type)
	73	SV* sv;
	74	char type;
	75	{
	76	MAGIC* mg;
	77	MAGIC** mgp = &SvMAGIC(sv);
	78	for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
	79	if (mg->mg_type == type)
	80	return mg;
	81	}
	82	return 0;
	83	}
	84
79072805 LW	85	int
	86	mg_free(sv, type)
	87	SV* sv;
	88	char type;
	89	{
	90	MAGIC* mg;
	91	MAGIC** mgp = &SvMAGIC(sv);
	92	for (mg = mgp; mg; mg = mgp) {
	93	if (mg->mg_type == type) {
	94	MGVTBL* vtbl = mg->mg_virtual;
	95	*mgp = mg->mg_moremagic;
	96	if (vtbl && vtbl->svt_free)
	97	(*vtbl->svt_free)(sv, mg);
93a17b20	98	if (mg->mg_ptr && mg->mg_type != 'g')
79072805 LW	99	Safefree(mg->mg_ptr);
	100	Safefree(mg);
	101	}
	102	else
	103	mgp = &mg->mg_moremagic;
	104	}
	105	return 0;
	106	}
	107
	108	int
	109	mg_freeall(sv)
	110	SV* sv;
	111	{
	112	MAGIC* mg;
	113	MAGIC* moremagic;
	114	for (mg = SvMAGIC(sv); mg; mg = moremagic) {
	115	MGVTBL* vtbl = mg->mg_virtual;
	116	moremagic = mg->mg_moremagic;
	117	if (vtbl && vtbl->svt_free)
	118	(*vtbl->svt_free)(sv, mg);
93a17b20	119	if (mg->mg_ptr && mg->mg_type != 'g')
79072805 LW	120	Safefree(mg->mg_ptr);
	121	Safefree(mg);
	122	}
	123	SvMAGIC(sv) = 0;
	124	return 0;
	125	}
	126
	127	#if !defined(NSIG) \|\| defined(M_UNIX) \|\| defined(M_XENIX)
	128	#include <signal.h>
	129	#endif
	130
	131	#ifdef VOIDSIG
	132	#define handlertype void
	133	#else
	134	#define handlertype int
	135	#endif
	136
	137	static handlertype sighandler();
	138
93a17b20 LW	139	U32
	140	magic_len(sv, mg)
	141	SV *sv;
	142	MAGIC *mg;
	143	{
	144	register I32 paren;
	145	register char *s;
	146	register I32 i;
	147
	148	switch (*mg->mg_ptr) {
	149	case '1': case '2': case '3': case '4':
	150	case '5': case '6': case '7': case '8': case '9': case '&':
	151	if (curpm) {
	152	paren = atoi(mg->mg_ptr);
	153	getparen:
	154	if (curpm->op_pmregexp &&
	155	paren <= curpm->op_pmregexp->nparens &&
	156	(s = curpm->op_pmregexp->startp[paren]) ) {
	157	i = curpm->op_pmregexp->endp[paren] - s;
	158	if (i >= 0)
	159	return i;
	160	else
	161	return 0;
	162	}
	163	else
	164	return 0;
	165	}
	166	break;
	167	case '+':
	168	if (curpm) {
	169	paren = curpm->op_pmregexp->lastparen;
	170	goto getparen;
	171	}
	172	break;
	173	case '`':
	174	if (curpm) {
	175	if (curpm->op_pmregexp &&
	176	(s = curpm->op_pmregexp->subbeg) ) {
	177	i = curpm->op_pmregexp->startp[0] - s;
	178	if (i >= 0)
	179	return i;
	180	else
	181	return 0;
	182	}
	183	else
	184	return 0;
	185	}
	186	break;
	187	case '\'':
	188	if (curpm) {
	189	if (curpm->op_pmregexp &&
	190	(s = curpm->op_pmregexp->endp[0]) ) {
	191	return (STRLEN) (curpm->op_pmregexp->subend - s);
	192	}
	193	else
	194	return 0;
	195	}
	196	break;
	197	case ',':
	198	return (STRLEN)ofslen;
	199	case '\\':
	200	return (STRLEN)orslen;
	201	}
	202	magic_get(sv,mg);
203	if (!SvPOK(sv) && SvNIOK(sv))
204	sv_2pv(sv);
205	if (SvPOK(sv))
206	return SvCUR(sv);
207	return 0;
208	}
209
79072805 LW	210	int
	211	magic_get(sv, mg)
	212	SV *sv;
	213	MAGIC *mg;
	214	{
	215	register I32 paren;
	216	register char *s;
	217	register I32 i;
	218
	219	switch (*mg->mg_ptr) {
	220	case '\004': /* ^D */
	221	sv_setiv(sv,(I32)(debug & 32767));
	222	break;
	223	case '\006': /* ^F */
	224	sv_setiv(sv,(I32)maxsysfd);
	225	break;
	226	case '\t': /* ^I */
	227	if (inplace)
	228	sv_setpv(sv, inplace);
	229	else
	230	sv_setsv(sv,&sv_undef);
	231	break;
	232	case '\020': /* ^P */
	233	sv_setiv(sv,(I32)perldb);
	234	break;
	235	case '\024': /* ^T */
	236	sv_setiv(sv,(I32)basetime);
	237	break;
	238	case '\027': /* ^W */
	239	sv_setiv(sv,(I32)dowarn);
	240	break;
	241	case '1': case '2': case '3': case '4':
	242	case '5': case '6': case '7': case '8': case '9': case '&':
	243	if (curpm) {
	244	paren = atoi(GvENAME(mg->mg_obj));
	245	getparen:
	246	if (curpm->op_pmregexp &&
	247	paren <= curpm->op_pmregexp->nparens &&
	248	(s = curpm->op_pmregexp->startp[paren]) ) {
	249	i = curpm->op_pmregexp->endp[paren] - s;
	250	if (i >= 0)
	251	sv_setpvn(sv,s,i);
	252	else
	253	sv_setsv(sv,&sv_undef);
	254	}
	255	else
	256	sv_setsv(sv,&sv_undef);
	257	}
	258	break;
	259	case '+':
	260	if (curpm) {
	261	paren = curpm->op_pmregexp->lastparen;
	262	goto getparen;
	263	}
	264	break;
	265	case '`':
	266	if (curpm) {
	267	if (curpm->op_pmregexp &&
	268	(s = curpm->op_pmregexp->subbeg) ) {
	269	i = curpm->op_pmregexp->startp[0] - s;
	270	if (i >= 0)
	271	sv_setpvn(sv,s,i);
	272	else
	273	sv_setpvn(sv,"",0);
274	}
275	else
276	sv_setpvn(sv,"",0);
277	}
278	break;
279	case '\'':
280	if (curpm) {
281	if (curpm->op_pmregexp &&
282	(s = curpm->op_pmregexp->endp[0]) ) {
283	sv_setpvn(sv,s, curpm->op_pmregexp->subend - s);
284	}
285	else
286	sv_setpvn(sv,"",0);
287	}
288	break;
289	case '.':
290	#ifndef lint
291	if (last_in_gv && GvIO(last_in_gv)) {
292	sv_setiv(sv,(I32)GvIO(last_in_gv)->lines);
293	}
294	#endif
295	break;
296	case '?':
297	sv_setiv(sv,(I32)statusvalue);
298	break;
299	case '^':
300	s = GvIO(defoutgv)->top_name;
301	if (s)
302	sv_setpv(sv,s);
303	else {
304	sv_setpv(sv,GvENAME(defoutgv));
305	sv_catpv(sv,"_TOP");
306	}
307	break;
308	case '~':
309	s = GvIO(defoutgv)->fmt_name;
310	if (!s)
311	s = GvENAME(defoutgv);
312	sv_setpv(sv,s);
313	break;
314	#ifndef lint
315	case '=':
316	sv_setiv(sv,(I32)GvIO(defoutgv)->page_len);
317	break;
318	case '-':
319	sv_setiv(sv,(I32)GvIO(defoutgv)->lines_left);
320	break;
321	case '%':
322	sv_setiv(sv,(I32)GvIO(defoutgv)->page);
323	break;
324	#endif
325	case ':':
326	break;
327	case '/':
328	break;
329	case '[':
330	sv_setiv(sv,(I32)arybase);
331	break;
332	case '\|':
333	if (!GvIO(defoutgv))
334	GvIO(defoutgv) = newIO();
335	sv_setiv(sv, (GvIO(defoutgv)->flags & IOf_FLUSH) != 0 );
336	break;
337	case ',':
338	sv_setpvn(sv,ofs,ofslen);
339	break;
340	case '\\':
341	sv_setpvn(sv,ors,orslen);
342	break;
343	case '#':
344	sv_setpv(sv,ofmt);
345	break;
346	case '!':
347	sv_setnv(sv,(double)errno);
348	sv_setpv(sv, errno ? strerror(errno) : "");
349	SvNOK_on(sv); /* what a wonderful hack! */
350	break;
351	case '<':
352	sv_setiv(sv,(I32)uid);
353	break;
354	case '>':
355	sv_setiv(sv,(I32)euid);
356	break;
357	case '(':
358	s = buf;
359	(void)sprintf(s,"%d",(int)gid);
360	goto add_groups;
361	case ')':
362	s = buf;
363	(void)sprintf(s,"%d",(int)egid);
364	add_groups:
365	while (*s) s++;
366	#ifdef HAS_GETGROUPS
367	#ifndef NGROUPS
368	#define NGROUPS 32
369	#endif
370	{
371	GROUPSTYPE gary[NGROUPS];
372
373	i = getgroups(NGROUPS,gary);
374	while (--i >= 0) {
375	(void)sprintf(s," %ld", (long)gary[i]);
376	while (*s) s++;
377	}
378	}
379	#endif
380	sv_setpv(sv,buf);
381	break;
382	case '*':
383	break;
384	case '0':
385	break;
386	}
387	}
388
389	int
390	magic_getuvar(sv, mg)
391	SV *sv;
392	MAGIC *mg;
393	{
394	struct ufuncs uf = (struct ufuncs )mg->mg_ptr;
395
396	if (uf && uf->uf_val)
397	(*uf->uf_val)(uf->uf_index, sv);
398	return 0;
399	}
400
401	int
402	magic_setenv(sv,mg)
403	SV* sv;
404	MAGIC* mg;
405	{
406	register char *s;
407	I32 i;
408	s = SvPV(sv);
409	my_setenv(mg->mg_ptr,s);
410	/* And you'll never guess what the dog had */
411	/* in its mouth... */
412	#ifdef TAINT
413	if (s && strEQ(mg->mg_ptr,"PATH")) {
414	char *strend = SvEND(sv);
415
416	while (s < strend) {
417	s = cpytill(tokenbuf,s,strend,':',&i);
418	s++;
419	if (*tokenbuf != '/'
420	\|\| (stat(tokenbuf,&statbuf) && (statbuf.st_mode & 2)) )
421	sv->sv_tainted = 2;
422	}
423	}
424	#endif
425	return 0;
426	}
427
428	int
429	magic_setsig(sv,mg)
430	SV* sv;
431	MAGIC* mg;
432	{
433	register char *s;
434	I32 i;
435	s = SvPV(sv);
436	i = whichsig(mg->mg_ptr); /* ...no, a brick */
437	if (!i && (dowarn \|\| strEQ(mg->mg_ptr,"ALARM")))
438	warn("No such signal: SIG%s", mg->mg_ptr);
439	if (strEQ(s,"IGNORE"))
440	#ifndef lint
441	(void)signal(i,SIG_IGN);
442	#else
443	;
444	#endif
445	else if (strEQ(s,"DEFAULT") \|\| !*s)
446	(void)signal(i,SIG_DFL);
447	else {
448	(void)signal(i,sighandler);
93a17b20	449	if (!strchr(s,'\'')) {
79072805 LW	450	sprintf(tokenbuf, "main'%s",s);
	451	sv_setpv(sv,tokenbuf);
	452	}
	453	}
	454	return 0;
	455	}
	456
	457	int
	458	magic_setdbm(sv,mg)
	459	SV* sv;
	460	MAGIC* mg;
	461	{
	462	HV* hv = (HV*)mg->mg_obj;
	463	hv_dbmstore(hv,mg->mg_ptr,mg->mg_len,sv); /* XXX slurp? */
	464	return 0;
	465	}
	466
	467	int
	468	magic_setdbline(sv,mg)
	469	SV* sv;
	470	MAGIC* mg;
	471	{
	472	OP *o;
	473	I32 i;
	474	GV* gv;
	475	SV** svp;
	476
	477	gv = DBline;
	478	i = SvTRUE(sv);
	479	svp = av_fetch(GvAV(gv),atoi(mg->mg_ptr), FALSE);
93a17b20 LW	480	if (svp && SvIOK(svp) && (o = (OP)SvSTASH(*svp)))
93a17b20 LW	481	o->op_private = i;
79072805 LW	482	else
	483	warn("Can't break at that line\n");
	484	return 0;
	485	}
	486
	487	int
	488	magic_getarylen(sv,mg)
	489	SV* sv;
	490	MAGIC* mg;
	491	{
	492	sv_setiv(sv, AvFILL((AV*)mg->mg_obj) + arybase);
	493	return 0;
	494	}
	495
	496	int
	497	magic_setarylen(sv,mg)
	498	SV* sv;
	499	MAGIC* mg;
	500	{
	501	av_fill((AV*)mg->mg_obj, (SvIOK(sv) ? SvIV(sv) : sv_2iv(sv)) - arybase);
	502	return 0;
	503	}
	504
	505	int
	506	magic_getglob(sv,mg)
	507	SV* sv;
	508	MAGIC* mg;
	509	{
	510	gv_efullname(sv,((GV)sv));/ a gv value, be nice */
	511	return 0;
	512	}
	513
	514	int
	515	magic_setglob(sv,mg)
	516	SV* sv;
	517	MAGIC* mg;
	518	{
	519	register char *s;
	520	GV* gv;
	521
	522	if (!SvOK(sv))
	523	return 0;
	524	s = SvPOK(sv) ? SvPV(sv) : sv_2pv(sv);
	525	if (s == '' && s[1])
	526	s++;
	527	gv = gv_fetchpv(s,TRUE);
	528	if (sv == (SV*)gv)
	529	return 0;
	530	if (GvGP(sv))
	531	gp_free(sv);
	532	GvGP(sv) = gp_ref(GvGP(gv));
	533	if (!GvAV(gv))
	534	gv_AVadd(gv);
	535	if (!GvHV(gv))
	536	gv_HVadd(gv);
	537	if (!GvIO(gv))
	538	GvIO(gv) = newIO();
	539	return 0;
	540	}
	541
	542	int
	543	magic_setsubstr(sv,mg)
	544	SV* sv;
	545	MAGIC* mg;
546	{
547	char *tmps = SvPV(sv);
548	if (!tmps)
549	tmps = "";
550	sv_insert(LvTARG(sv),LvTARGOFF(sv),LvTARGLEN(sv), tmps,SvCUR(sv));
551	return 0;
552	}
553
554	int
555	magic_setvec(sv,mg)
556	SV* sv;
557	MAGIC* mg;
558	{
559	do_vecset(sv); /* XXX slurp this routine */
560	return 0;
561	}
562
563	int
93a17b20 LW	564	magic_setmglob(sv,mg)
	565	SV* sv;
	566	MAGIC* mg;
	567	{
	568	mg->mg_ptr = 0;
	569	mg->mg_len = 0;
	570	return 0;
	571	}
	572
	573	int
79072805 LW	574	magic_setbm(sv,mg)
	575	SV* sv;
	576	MAGIC* mg;
	577	{
	578	mg_free(sv, 'B');
	579	SvVALID_off(sv);
	580	return 0;
	581	}
	582
	583	int
	584	magic_setuvar(sv,mg)
	585	SV* sv;
	586	MAGIC* mg;
	587	{
	588	struct ufuncs uf = (struct ufuncs )mg->mg_ptr;
	589
	590	if (uf && uf->uf_set)
	591	(*uf->uf_set)(uf->uf_index, sv);
	592	return 0;
	593	}
	594
	595	int
	596	magic_set(sv,mg)
	597	SV* sv;
	598	MAGIC* mg;
	599	{
	600	register char *s;
	601	I32 i;
	602	switch (*mg->mg_ptr) {
	603	case '\004': /* ^D */
	604	debug = (SvIOK(sv) ? SvIV(sv) : sv_2iv(sv)) \| 32768;
	605	DEBUG_x(dump_all());
	606	break;
	607	case '\006': /* ^F */
	608	maxsysfd = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	609	break;
	610	case '\t': /* ^I */
	611	if (inplace)
	612	Safefree(inplace);
	613	if (SvOK(sv))
	614	inplace = savestr(SvPV(sv));
	615	else
	616	inplace = Nullch;
	617	break;
	618	case '\020': /* ^P */
	619	i = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	620	if (i != perldb) {
	621	if (perldb)
	622	oldlastpm = curpm;
	623	else
	624	curpm = oldlastpm;
	625	}
	626	perldb = i;
	627	break;
	628	case '\024': /* ^T */
	629	basetime = (time_t)(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
	630	break;
	631	case '\027': /* ^W */
	632	dowarn = (bool)(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
	633	break;
	634	case '.':
	635	if (localizing)
	636	save_sptr((SV**)&last_in_gv);
	637	break;
638	case '^':
639	Safefree(GvIO(defoutgv)->top_name);
640	GvIO(defoutgv)->top_name = s = savestr(SvPV(sv));
641	GvIO(defoutgv)->top_gv = gv_fetchpv(s,TRUE);
642	break;
643	case '~':
644	Safefree(GvIO(defoutgv)->fmt_name);
645	GvIO(defoutgv)->fmt_name = s = savestr(SvPV(sv));
646	GvIO(defoutgv)->fmt_gv = gv_fetchpv(s,TRUE);
647	break;
648	case '=':
649	GvIO(defoutgv)->page_len = (long)(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
650	break;
651	case '-':
652	GvIO(defoutgv)->lines_left = (long)(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
653	if (GvIO(defoutgv)->lines_left < 0L)
654	GvIO(defoutgv)->lines_left = 0L;
655	break;
656	case '%':
657	GvIO(defoutgv)->page = (long)(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
658	break;
659	case '\|':
660	if (!GvIO(defoutgv))
661	GvIO(defoutgv) = newIO();
662	GvIO(defoutgv)->flags &= ~IOf_FLUSH;
663	if ((SvIOK(sv) ? SvIV(sv) : sv_2iv(sv)) != 0) {
664	GvIO(defoutgv)->flags \|= IOf_FLUSH;
665	}
666	break;
667	case '*':
668	i = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
669	multiline = (i != 0);
670	break;
671	case '/':
672	if (SvPOK(sv)) {
93a17b20 LW	673	nrs = rs = SvPV(sv);
93a17b20 LW	674	nrslen = rslen = SvCUR(sv);
79072805	675	if (rspara = !rslen) {
93a17b20 LW	676	nrs = rs = "\n\n";
93a17b20 LW	677	nrslen = rslen = 2;
79072805	678	}
93a17b20	679	nrschar = rschar = rs[rslen - 1];
79072805 LW	680	}
79072805 LW	681	else {
93a17b20 LW	682	nrschar = rschar = 0777; /* fake a non-existent char */
93a17b20 LW	683	nrslen = rslen = 1;
79072805 LW	684	}
	685	break;
	686	case '\\':
	687	if (ors)
	688	Safefree(ors);
	689	ors = savestr(SvPV(sv));
	690	orslen = SvCUR(sv);
	691	break;
	692	case ',':
	693	if (ofs)
	694	Safefree(ofs);
	695	ofs = savestr(SvPV(sv));
	696	ofslen = SvCUR(sv);
	697	break;
	698	case '#':
	699	if (ofmt)
	700	Safefree(ofmt);
	701	ofmt = savestr(SvPV(sv));
	702	break;
	703	case '[':
	704	arybase = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	705	break;
	706	case '?':
	707	statusvalue = U_S(SvIOK(sv) ? SvIV(sv) : sv_2iv(sv));
	708	break;
	709	case '!':
	710	errno = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv); /* will anyone ever use this? */
	711	break;
	712	case '<':
	713	uid = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	714	if (delaymagic) {
	715	delaymagic \|= DM_RUID;
	716	break; /* don't do magic till later */
	717	}
	718	#ifdef HAS_SETRUID
	719	(void)setruid((UIDTYPE)uid);
	720	#else
	721	#ifdef HAS_SETREUID
	722	(void)setreuid((UIDTYPE)uid, (UIDTYPE)-1);
	723	#else
	724	if (uid == euid) /* special case $< = $> */
	725	(void)setuid(uid);
	726	else
	727	fatal("setruid() not implemented");
	728	#endif
	729	#endif
	730	uid = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	731	break;
	732	case '>':
	733	euid = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
	734	if (delaymagic) {
	735	delaymagic \|= DM_EUID;
	736	break; /* don't do magic till later */
	737	}
	738	#ifdef HAS_SETEUID
	739	(void)seteuid((UIDTYPE)euid);
	740	#else
	741	#ifdef HAS_SETREUID
	742	(void)setreuid((UIDTYPE)-1, (UIDTYPE)euid);
	743	#else
	744	if (euid == uid) /* special case $> = $< */
	745	setuid(euid);
	746	else
	747	fatal("seteuid() not implemented");
748	#endif
749	#endif
750	euid = (I32)geteuid();
751	break;
752	case '(':
753	gid = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
754	if (delaymagic) {
755	delaymagic \|= DM_RGID;
756	break; /* don't do magic till later */
757	}
758	#ifdef HAS_SETRGID
759	(void)setrgid((GIDTYPE)gid);
760	#else
761	#ifdef HAS_SETREGID
762	(void)setregid((GIDTYPE)gid, (GIDTYPE)-1);
763	#else
764	if (gid == egid) /* special case $( = $) */
765	(void)setgid(gid);
766	else
767	fatal("setrgid() not implemented");
768	#endif
769	#endif
770	gid = (I32)getgid();
771	break;
772	case ')':
773	egid = SvIOK(sv) ? SvIV(sv) : sv_2iv(sv);
774	if (delaymagic) {
775	delaymagic \|= DM_EGID;
776	break; /* don't do magic till later */
777	}
778	#ifdef HAS_SETEGID
779	(void)setegid((GIDTYPE)egid);
780	#else
781	#ifdef HAS_SETREGID
782	(void)setregid((GIDTYPE)-1, (GIDTYPE)egid);
783	#else
784	if (egid == gid) /* special case $) = $( */
785	(void)setgid(egid);
786	else
787	fatal("setegid() not implemented");
788	#endif
789	#endif
790	egid = (I32)getegid();
791	break;
792	case ':':
793	chopset = SvPV(sv);
794	break;
795	case '0':
796	if (!origalen) {
797	s = origargv[0];
798	s += strlen(s);
799	/* See if all the arguments are contiguous in memory */
800	for (i = 1; i < origargc; i++) {
801	if (origargv[i] == s + 1)
802	s += strlen(++s); /* this one is ok too */
803	}
804	if (origenviron[0] == s + 1) { /* can grab env area too? */
805	my_setenv("NoNeSuCh", Nullch);
806	/* force copy of environment */
807	for (i = 0; origenviron[i]; i++)
808	if (origenviron[i] == s + 1)
809	s += strlen(++s);
810	}
811	origalen = s - origargv[0];
812	}
813	s = SvPV(sv);
814	i = SvCUR(sv);
815	if (i >= origalen) {
816	i = origalen;
817	SvCUR_set(sv, i);
818	*SvEND(sv) = '\0';
819	Copy(s, origargv[0], i, char);
820	}
821	else {
822	Copy(s, origargv[0], i, char);
823	s = origargv[0]+i;
824	*s++ = '\0';
825	while (++i < origalen)
826	*s++ = ' ';
827	}
828	break;
829	}
830	return 0;
831	}
832
833	I32
834	whichsig(sig)
835	char *sig;
836	{
837	register char **sigv;
838
839	for (sigv = sig_name+1; *sigv; sigv++)
840	if (strEQ(sig,*sigv))
841	return sigv - sig_name;
842	#ifdef SIGCLD
843	if (strEQ(sig,"CHLD"))
844	return SIGCLD;
845	#endif
846	#ifdef SIGCHLD
847	if (strEQ(sig,"CLD"))
848	return SIGCHLD;
849	#endif
850	return 0;
851	}
852
853	static handlertype
854	sighandler(sig)
855	I32 sig;
856	{
857	dSP;
858	GV *gv;
859	SV *sv;
860	CV *cv;
861	CONTEXT *cx;
862	AV *oldstack;
863	I32 hasargs = 1;
864	I32 items = 1;
865	I32 gimme = G_SCALAR;
866
867	#ifdef OS2 /* or anybody else who requires SIG_ACK */
868	signal(sig, SIG_ACK);
869	#endif
870
871	gv = gv_fetchpv(
872	SvPVnx(*hv_fetch(GvHVn(siggv),sig_name[sig],strlen(sig_name[sig]),
873	TRUE)), TRUE);
874	cv = GvCV(gv);
875	if (!cv && *sig_name[sig] == 'C' && instr(sig_name[sig],"LD")) {
876	if (sig_name[sig][1] == 'H')
877	gv = gv_fetchpv(SvPVnx(*hv_fetch(GvHVn(siggv),"CLD",3,TRUE)),
878	TRUE);
879	else
880	gv = gv_fetchpv(SvPVnx(*hv_fetch(GvHVn(siggv),"CHLD",4,TRUE)),
881	TRUE);
882	cv = GvCV(gv); /* gag */
883	}
884	if (!cv) {
885	if (dowarn)
886	warn("SIG%s handler \"%s\" not defined.\n",
887	sig_name[sig], GvENAME(gv) );
888	return;
889	}
890
891	oldstack = stack;
892	SWITCHSTACK(stack, signalstack);
893
894	sv = sv_mortalcopy(&sv_undef);
895	sv_setpv(sv,sig_name[sig]);
896	PUSHs(sv);
897
898	ENTER;
899	SAVETMPS;
900
901	push_return(op);
902	push_return(0);
903	PUSHBLOCK(cx, CXt_SUB, sp);
904	PUSHSUB(cx);
905	cx->blk_sub.savearray = GvAV(defgv);
906	cx->blk_sub.argarray = av_fake(items, sp);
907	GvAV(defgv) = cx->blk_sub.argarray;
908	CvDEPTH(cv)++;
909	if (CvDEPTH(cv) >= 2) {
910	if (CvDEPTH(cv) == 100 && dowarn)
911	warn("Deep recursion on subroutine \"%s\"",GvENAME(gv));
912	}
913	op = CvSTART(cv);
914	PUTBACK;
915	run(); /* Does the LEAVE for us. */
916
917	SWITCHSTACK(signalstack, oldstack);
918	op = pop_return();
919
920	return;
921	}