forked from schacon/perl
/
mg.c
1581 lines (1468 loc) · 28.6 KB
/
mg.c
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/* mg.c
*
* Copyright (c) 1991-1994, 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.
*
*/
/*
* "Sam sat on the ground and put his head in his hands. 'I wish I had never
* come here, and I don't want to see no more magic,' he said, and fell silent."
*/
#include "EXTERN.h"
#include "perl.h"
/* XXX If this causes problems, set i_unistd=undef in the hint file. */
#ifdef I_UNISTD
# include <unistd.h>
#endif
#ifdef HAS_GETGROUPS
# ifndef NGROUPS
# define NGROUPS 32
# endif
#endif
/*
* Use the "DESTRUCTOR" scope cleanup to reinstate magic.
*/
struct magic_state {
SV* mgs_sv;
U32 mgs_flags;
};
typedef struct magic_state MGS;
static void restore_magic _((void *p));
static void
save_magic(mgs, sv)
MGS* mgs;
SV* sv;
{
assert(SvMAGICAL(sv));
mgs->mgs_sv = sv;
mgs->mgs_flags = SvMAGICAL(sv) | SvREADONLY(sv);
SAVEDESTRUCTOR(restore_magic, mgs);
SvMAGICAL_off(sv);
SvREADONLY_off(sv);
SvFLAGS(sv) |= (SvFLAGS(sv) & (SVp_IOK|SVp_NOK|SVp_POK)) >> PRIVSHIFT;
}
static void
restore_magic(p)
void* p;
{
MGS* mgs = (MGS*)p;
SV* sv = mgs->mgs_sv;
if (SvTYPE(sv) >= SVt_PVMG && SvMAGIC(sv))
{
if (mgs->mgs_flags)
SvFLAGS(sv) |= mgs->mgs_flags;
else
mg_magical(sv);
if (SvGMAGICAL(sv))
SvFLAGS(sv) &= ~(SVf_IOK|SVf_NOK|SVf_POK);
}
}
void
mg_magical(sv)
SV* sv;
{
MAGIC* mg;
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
MGVTBL* vtbl = mg->mg_virtual;
if (vtbl) {
if (vtbl->svt_get && !(mg->mg_flags & MGf_GSKIP))
SvGMAGICAL_on(sv);
if (vtbl->svt_set)
SvSMAGICAL_on(sv);
if (!(SvFLAGS(sv) & (SVs_GMG|SVs_SMG)) || vtbl->svt_clear)
SvRMAGICAL_on(sv);
}
}
}
int
mg_get(sv)
SV* sv;
{
MGS mgs;
MAGIC* mg;
MAGIC** mgp;
int mgp_valid = 0;
ENTER;
save_magic(&mgs, sv);
mgp = &SvMAGIC(sv);
while ((mg = *mgp) != 0) {
MGVTBL* vtbl = mg->mg_virtual;
if (!(mg->mg_flags & MGf_GSKIP) && vtbl && vtbl->svt_get) {
(*vtbl->svt_get)(sv, mg);
/* Ignore this magic if it's been deleted */
if ((mg == (mgp_valid ? *mgp : SvMAGIC(sv))) &&
(mg->mg_flags & MGf_GSKIP))
mgs.mgs_flags = 0;
}
/* Advance to next magic (complicated by possible deletion) */
if (mg == (mgp_valid ? *mgp : SvMAGIC(sv))) {
mgp = &mg->mg_moremagic;
mgp_valid = 1;
}
else
mgp = &SvMAGIC(sv); /* Re-establish pointer after sv_upgrade */
}
LEAVE;
return 0;
}
int
mg_set(sv)
SV* sv;
{
MGS mgs;
MAGIC* mg;
MAGIC* nextmg;
ENTER;
save_magic(&mgs, sv);
for (mg = SvMAGIC(sv); mg; mg = nextmg) {
MGVTBL* vtbl = mg->mg_virtual;
nextmg = mg->mg_moremagic; /* it may delete itself */
if (mg->mg_flags & MGf_GSKIP) {
mg->mg_flags &= ~MGf_GSKIP; /* setting requires another read */
mgs.mgs_flags = 0;
}
if (vtbl && vtbl->svt_set)
(*vtbl->svt_set)(sv, mg);
}
LEAVE;
return 0;
}
U32
mg_len(sv)
SV* sv;
{
MAGIC* mg;
char *junk;
STRLEN len;
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
MGVTBL* vtbl = mg->mg_virtual;
if (vtbl && vtbl->svt_len) {
MGS mgs;
ENTER;
save_magic(&mgs, sv);
/* omit MGf_GSKIP -- not changed here */
len = (*vtbl->svt_len)(sv, mg);
LEAVE;
return len;
}
}
junk = SvPV(sv, len);
return len;
}
int
mg_clear(sv)
SV* sv;
{
MGS mgs;
MAGIC* mg;
ENTER;
save_magic(&mgs, sv);
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
MGVTBL* vtbl = mg->mg_virtual;
/* omit GSKIP -- never set here */
if (vtbl && vtbl->svt_clear)
(*vtbl->svt_clear)(sv, mg);
}
LEAVE;
return 0;
}
MAGIC*
mg_find(sv, type)
SV* sv;
int type;
{
MAGIC* mg;
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
if (mg->mg_type == type)
return mg;
}
return 0;
}
int
mg_copy(sv, nsv, key, klen)
SV* sv;
SV* nsv;
char *key;
I32 klen;
{
int count = 0;
MAGIC* mg;
for (mg = SvMAGIC(sv); mg; mg = mg->mg_moremagic) {
if (isUPPER(mg->mg_type)) {
sv_magic(nsv, mg->mg_obj, toLOWER(mg->mg_type), key, klen);
count++;
}
}
return count;
}
int
mg_free(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')
if (mg->mg_len >= 0)
Safefree(mg->mg_ptr);
else if (mg->mg_len == HEf_SVKEY)
SvREFCNT_dec((SV*)mg->mg_ptr);
if (mg->mg_flags & MGf_REFCOUNTED)
SvREFCNT_dec(mg->mg_obj);
Safefree(mg);
}
SvMAGIC(sv) = 0;
return 0;
}
#if !defined(NSIG) || defined(M_UNIX) || defined(M_XENIX)
#include <signal.h>
#endif
U32
magic_len(sv, mg)
SV *sv;
MAGIC *mg;
{
register I32 paren;
register char *s;
register I32 i;
register REGEXP *rx;
char *t;
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 && (rx = curpm->op_pmregexp)) {
paren = atoi(mg->mg_ptr);
getparen:
if (paren <= rx->nparens &&
(s = rx->startp[paren]) &&
(t = rx->endp[paren]))
{
i = t - s;
if (i >= 0)
return i;
}
}
return 0;
break;
case '+':
if (curpm && (rx = curpm->op_pmregexp)) {
paren = rx->lastparen;
if (paren)
goto getparen;
}
return 0;
break;
case '`':
if (curpm && (rx = curpm->op_pmregexp)) {
if ((s = rx->subbeg) && rx->startp[0]) {
i = rx->startp[0] - s;
if (i >= 0)
return i;
}
}
return 0;
case '\'':
if (curpm && (rx = curpm->op_pmregexp)) {
if (rx->subend && (s = rx->endp[0])) {
i = rx->subend - s;
if (i >= 0)
return 0;
}
}
return 0;
case ',':
return (STRLEN)ofslen;
case '\\':
return (STRLEN)orslen;
}
magic_get(sv,mg);
if (!SvPOK(sv) && SvNIOK(sv))
sv_2pv(sv, &na);
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;
register REGEXP *rx;
char *t;
switch (*mg->mg_ptr) {
case '\001': /* ^A */
sv_setsv(sv, bodytarget);
break;
case '\004': /* ^D */
sv_setiv(sv, (IV)(debug & 32767));
break;
case '\005': /* ^E */
#ifdef VMS
{
# include <descrip.h>
# include <starlet.h>
char msg[255];
$DESCRIPTOR(msgdsc,msg);
sv_setnv(sv,(double) vaxc$errno);
if (sys$getmsg(vaxc$errno,&msgdsc.dsc$w_length,&msgdsc,0,0) & 1)
sv_setpvn(sv,msgdsc.dsc$a_pointer,msgdsc.dsc$w_length);
else
sv_setpv(sv,"");
}
#else
#ifdef OS2
sv_setnv(sv, (double)Perl_rc);
sv_setpv(sv, os2error(Perl_rc));
#else
sv_setnv(sv, (double)errno);
sv_setpv(sv, errno ? Strerror(errno) : "");
#endif
#endif
SvNOK_on(sv); /* what a wonderful hack! */
break;
case '\006': /* ^F */
sv_setiv(sv, (IV)maxsysfd);
break;
case '\010': /* ^H */
sv_setiv(sv, (IV)hints);
break;
case '\t': /* ^I */
if (inplace)
sv_setpv(sv, inplace);
else
sv_setsv(sv, &sv_undef);
break;
case '\017': /* ^O */
sv_setpv(sv, osname);
break;
case '\020': /* ^P */
sv_setiv(sv, (IV)perldb);
break;
case '\024': /* ^T */
#ifdef BIG_TIME
sv_setnv(sv, basetime);
#else
sv_setiv(sv, (IV)basetime);
#endif
break;
case '\027': /* ^W */
sv_setiv(sv, (IV)dowarn);
break;
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9': case '&':
if (curpm && (rx = curpm->op_pmregexp)) {
paren = atoi(GvENAME((GV*)mg->mg_obj));
getparen:
if (paren <= rx->nparens &&
(s = rx->startp[paren]) &&
(t = rx->endp[paren]))
{
i = t - s;
getrx:
if (i >= 0) {
bool was_tainted;
if (tainting) {
was_tainted = tainted;
tainted = FALSE;
}
sv_setpvn(sv,s,i);
if (tainting)
tainted = was_tainted || rx->exec_tainted;
break;
}
}
}
sv_setsv(sv,&sv_undef);
break;
case '+':
if (curpm && (rx = curpm->op_pmregexp)) {
paren = rx->lastparen;
if (paren)
goto getparen;
}
sv_setsv(sv,&sv_undef);
break;
case '`':
if (curpm && (rx = curpm->op_pmregexp)) {
if ((s = rx->subbeg) && rx->startp[0]) {
i = rx->startp[0] - s;
goto getrx;
}
}
sv_setsv(sv,&sv_undef);
break;
case '\'':
if (curpm && (rx = curpm->op_pmregexp)) {
if (rx->subend && (s = rx->endp[0])) {
i = rx->subend - s;
goto getrx;
}
}
sv_setsv(sv,&sv_undef);
break;
case '.':
#ifndef lint
if (GvIO(last_in_gv)) {
sv_setiv(sv, (IV)IoLINES(GvIO(last_in_gv)));
}
#endif
break;
case '?':
sv_setiv(sv, (IV)STATUS_CURRENT);
#ifdef COMPLEX_STATUS
LvTARGOFF(sv) = statusvalue;
LvTARGLEN(sv) = statusvalue_vms;
#endif
break;
case '^':
s = IoTOP_NAME(GvIOp(defoutgv));
if (s)
sv_setpv(sv,s);
else {
sv_setpv(sv,GvENAME(defoutgv));
sv_catpv(sv,"_TOP");
}
break;
case '~':
s = IoFMT_NAME(GvIOp(defoutgv));
if (!s)
s = GvENAME(defoutgv);
sv_setpv(sv,s);
break;
#ifndef lint
case '=':
sv_setiv(sv, (IV)IoPAGE_LEN(GvIOp(defoutgv)));
break;
case '-':
sv_setiv(sv, (IV)IoLINES_LEFT(GvIOp(defoutgv)));
break;
case '%':
sv_setiv(sv, (IV)IoPAGE(GvIOp(defoutgv)));
break;
#endif
case ':':
break;
case '/':
break;
case '[':
sv_setiv(sv, (IV)curcop->cop_arybase);
break;
case '|':
sv_setiv(sv, (IV)(IoFLAGS(GvIOp(defoutgv)) & 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 '!':
#ifdef VMS
sv_setnv(sv, (double)((errno == EVMSERR) ? vaxc$errno : errno));
sv_setpv(sv, errno ? Strerror(errno) : "");
#else
{
int saveerrno = errno;
sv_setnv(sv, (double)errno);
#ifdef OS2
if (errno == errno_isOS2) sv_setpv(sv, os2error(Perl_rc));
else
#endif
sv_setpv(sv, errno ? Strerror(errno) : "");
errno = saveerrno;
}
#endif
SvNOK_on(sv); /* what a wonderful hack! */
break;
case '<':
sv_setiv(sv, (IV)uid);
break;
case '>':
sv_setiv(sv, (IV)euid);
break;
case '(':
sv_setiv(sv, (IV)gid);
s = buf;
(void)sprintf(s,"%d",(int)gid);
goto add_groups;
case ')':
sv_setiv(sv, (IV)egid);
s = buf;
(void)sprintf(s,"%d",(int)egid);
add_groups:
while (*s) s++;
#ifdef HAS_GETGROUPS
{
Groups_t gary[NGROUPS];
i = getgroups(NGROUPS,gary);
while (--i >= 0) {
(void)sprintf(s," %d", (int)gary[i]);
while (*s) s++;
}
}
#endif
sv_setpv(sv,buf);
SvIOK_on(sv); /* what a wonderful hack! */
break;
case '*':
break;
case '0':
break;
}
return 0;
}
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;
char *ptr;
STRLEN len;
I32 i;
s = SvPV(sv,len);
ptr = MgPV(mg);
my_setenv(ptr, s);
#ifdef DYNAMIC_ENV_FETCH
/* We just undefd an environment var. Is a replacement */
/* waiting in the wings? */
if (!len) {
HE *envhe;
SV *keysv;
if (mg->mg_len == HEf_SVKEY) keysv = (SV *)mg->mg_ptr;
else keysv = newSVpv(mg->mg_ptr,mg->mg_len);
if (envhe = hv_fetch_ent(GvHVn(envgv),keysv,FALSE,0))
s = SvPV(HeVAL(envhe),len);
if (mg->mg_len != HEf_SVKEY) SvREFCNT_dec(keysv);
}
#endif
/* And you'll never guess what the dog had */
/* in its mouth... */
if (tainting) {
if (s && strEQ(ptr,"PATH")) {
char *strend = s + len;
while (s < strend) {
s = cpytill(tokenbuf,s,strend,':',&i);
s++;
if (*tokenbuf != '/'
|| (Stat(tokenbuf,&statbuf) && (statbuf.st_mode & 2)) )
MgTAINTEDDIR_on(mg);
}
}
}
return 0;
}
int
magic_clearenv(sv,mg)
SV* sv;
MAGIC* mg;
{
my_setenv(MgPV(mg),Nullch);
return 0;
}
int
magic_getsig(sv,mg)
SV* sv;
MAGIC* mg;
{
I32 i;
/* Are we fetching a signal entry? */
i = whichsig(MgPV(mg));
if (i) {
if(psig_ptr[i])
sv_setsv(sv,psig_ptr[i]);
else {
Sighandler_t sigstate = rsignal_state(i);
/* cache state so we don't fetch it again */
if(sigstate == SIG_IGN)
sv_setpv(sv,"IGNORE");
else
sv_setsv(sv,&sv_undef);
psig_ptr[i] = SvREFCNT_inc(sv);
SvTEMP_off(sv);
}
}
return 0;
}
int
magic_clearsig(sv,mg)
SV* sv;
MAGIC* mg;
{
I32 i;
/* Are we clearing a signal entry? */
i = whichsig(MgPV(mg));
if (i) {
if(psig_ptr[i]) {
SvREFCNT_dec(psig_ptr[i]);
psig_ptr[i]=0;
}
if(psig_name[i]) {
SvREFCNT_dec(psig_name[i]);
psig_name[i]=0;
}
}
return 0;
}
int
magic_setsig(sv,mg)
SV* sv;
MAGIC* mg;
{
register char *s;
I32 i;
SV** svp;
s = MgPV(mg);
if (*s == '_') {
if (strEQ(s,"__DIE__"))
svp = &diehook;
else if (strEQ(s,"__WARN__"))
svp = &warnhook;
else if (strEQ(s,"__PARSE__"))
svp = &parsehook;
else
croak("No such hook: %s", s);
i = 0;
if (*svp) {
SvREFCNT_dec(*svp);
*svp = 0;
}
}
else {
i = whichsig(s); /* ...no, a brick */
if (!i) {
if (dowarn || strEQ(s,"ALARM"))
warn("No such signal: SIG%s", s);
return 0;
}
SvREFCNT_dec(psig_name[i]);
SvREFCNT_dec(psig_ptr[i]);
psig_ptr[i] = SvREFCNT_inc(sv);
SvTEMP_off(sv); /* Make sure it doesn't go away on us */
psig_name[i] = newSVpv(s, strlen(s));
SvREADONLY_on(psig_name[i]);
}
if (SvTYPE(sv) == SVt_PVGV || SvROK(sv)) {
if (i)
(void)rsignal(i, sighandler);
else
*svp = SvREFCNT_inc(sv);
return 0;
}
s = SvPV_force(sv,na);
if (strEQ(s,"IGNORE")) {
if (i)
(void)rsignal(i, SIG_IGN);
else
*svp = 0;
}
else if (strEQ(s,"DEFAULT") || !*s) {
if (i)
(void)rsignal(i, SIG_DFL);
else
*svp = 0;
}
else {
if(hints & HINT_STRICT_REFS)
die(no_symref,s,"a subroutine");
if (!strchr(s,':') && !strchr(s,'\'')) {
sprintf(tokenbuf, "main::%s",s);
sv_setpv(sv,tokenbuf);
}
if (i)
(void)rsignal(i, sighandler);
else
*svp = SvREFCNT_inc(sv);
}
return 0;
}
int
magic_setisa(sv,mg)
SV* sv;
MAGIC* mg;
{
sub_generation++;
return 0;
}
#ifdef OVERLOAD
int
magic_setamagic(sv,mg)
SV* sv;
MAGIC* mg;
{
/* HV_badAMAGIC_on(Sv_STASH(sv)); */
amagic_generation++;
return 0;
}
#endif /* OVERLOAD */
int
magic_setnkeys(sv,mg)
SV* sv;
MAGIC* mg;
{
if (LvTARG(sv)) {
hv_ksplit((HV*)LvTARG(sv), SvIV(sv));
LvTARG(sv) = Nullsv; /* Don't allow a ref to reassign this. */
}
return 0;
}
static int
magic_methpack(sv,mg,meth)
SV* sv;
MAGIC* mg;
char *meth;
{
dSP;
ENTER;
SAVETMPS;
PUSHMARK(sp);
EXTEND(sp, 2);
PUSHs(mg->mg_obj);
if (mg->mg_ptr) {
if (mg->mg_len >= 0)
PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
else if (mg->mg_len == HEf_SVKEY)
PUSHs((SV*)mg->mg_ptr);
}
else if (mg->mg_type == 'p')
PUSHs(sv_2mortal(newSViv(mg->mg_len)));
PUTBACK;
if (perl_call_method(meth, G_SCALAR))
sv_setsv(sv, *stack_sp--);
FREETMPS;
LEAVE;
return 0;
}
int
magic_getpack(sv,mg)
SV* sv;
MAGIC* mg;
{
magic_methpack(sv,mg,"FETCH");
if (mg->mg_ptr)
mg->mg_flags |= MGf_GSKIP;
return 0;
}
int
magic_setpack(sv,mg)
SV* sv;
MAGIC* mg;
{
dSP;
PUSHMARK(sp);
EXTEND(sp, 3);
PUSHs(mg->mg_obj);
if (mg->mg_ptr) {
if (mg->mg_len >= 0)
PUSHs(sv_2mortal(newSVpv(mg->mg_ptr, mg->mg_len)));
else if (mg->mg_len == HEf_SVKEY)
PUSHs((SV*)mg->mg_ptr);
}
else if (mg->mg_type == 'p')
PUSHs(sv_2mortal(newSViv(mg->mg_len)));
PUSHs(sv);
PUTBACK;
perl_call_method("STORE", G_SCALAR|G_DISCARD);
return 0;
}
int
magic_clearpack(sv,mg)
SV* sv;
MAGIC* mg;
{
return magic_methpack(sv,mg,"DELETE");
}
int magic_wipepack(sv,mg)
SV* sv;
MAGIC* mg;
{
dSP;
PUSHMARK(sp);
XPUSHs(mg->mg_obj);
PUTBACK;
perl_call_method("CLEAR", G_SCALAR|G_DISCARD);
return 0;
}
int
magic_nextpack(sv,mg,key)
SV* sv;
MAGIC* mg;
SV* key;
{
dSP;
char *meth = SvOK(key) ? "NEXTKEY" : "FIRSTKEY";
ENTER;
SAVETMPS;
PUSHMARK(sp);
EXTEND(sp, 2);
PUSHs(mg->mg_obj);
if (SvOK(key))
PUSHs(key);
PUTBACK;
if (perl_call_method(meth, G_SCALAR))
sv_setsv(key, *stack_sp--);
FREETMPS;
LEAVE;
return 0;
}
int
magic_existspack(sv,mg)
SV* sv;
MAGIC* mg;
{
return magic_methpack(sv,mg,"EXISTS");
}
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(MgPV(mg)), FALSE);
if (svp && SvIOKp(*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) + curcop->cop_arybase);
return 0;
}
int
magic_setarylen(sv,mg)
SV* sv;
MAGIC* mg;
{
av_fill((AV*)mg->mg_obj, SvIV(sv) - curcop->cop_arybase);
return 0;
}
int
magic_getpos(sv,mg)
SV* sv;
MAGIC* mg;
{
SV* lsv = LvTARG(sv);
if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv)) {
mg = mg_find(lsv, 'g');
if (mg && mg->mg_len >= 0) {
sv_setiv(sv, mg->mg_len + curcop->cop_arybase);
return 0;
}
}
(void)SvOK_off(sv);
return 0;
}
int
magic_setpos(sv,mg)
SV* sv;
MAGIC* mg;
{
SV* lsv = LvTARG(sv);
SSize_t pos;
STRLEN len;
mg = 0;
if (SvTYPE(lsv) >= SVt_PVMG && SvMAGIC(lsv))
mg = mg_find(lsv, 'g');
if (!mg) {
if (!SvOK(sv))
return 0;
sv_magic(lsv, (SV*)0, 'g', Nullch, 0);
mg = mg_find(lsv, 'g');
}
else if (!SvOK(sv)) {
mg->mg_len = -1;
return 0;
}
len = SvPOK(lsv) ? SvCUR(lsv) : sv_len(lsv);
pos = SvIV(sv) - curcop->cop_arybase;
if (pos < 0) {
pos += len;
if (pos < 0)
pos = 0;
}
else if (pos > len)
pos = len;