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pp_hot.c
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pp_hot.c
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/* pp_hot.c
*
* Copyright (c) 1991-1997, 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.
*
*/
/*
* Then he heard Merry change the note, and up went the Horn-cry of Buckland,
* shaking the air.
*
* Awake! Awake! Fear, Fire, Foes! Awake!
* Fire, Foes! Awake!
*/
#include "EXTERN.h"
#include "perl.h"
/* Hot code. */
PP(pp_const)
{
dSP;
XPUSHs(cSVOP->op_sv);
RETURN;
}
PP(pp_nextstate)
{
curcop = (COP*)op;
TAINT_NOT; /* Each statement is presumed innocent */
stack_sp = stack_base + cxstack[cxstack_ix].blk_oldsp;
FREETMPS;
return NORMAL;
}
PP(pp_gvsv)
{
dSP;
EXTEND(sp,1);
if (op->op_private & OPpLVAL_INTRO)
PUSHs(save_scalar(cGVOP->op_gv));
else
PUSHs(GvSV(cGVOP->op_gv));
RETURN;
}
PP(pp_null)
{
return NORMAL;
}
PP(pp_pushmark)
{
PUSHMARK(stack_sp);
return NORMAL;
}
PP(pp_stringify)
{
dSP; dTARGET;
STRLEN len;
char *s;
s = SvPV(TOPs,len);
sv_setpvn(TARG,s,len);
SETTARG;
RETURN;
}
PP(pp_gv)
{
dSP;
XPUSHs((SV*)cGVOP->op_gv);
RETURN;
}
PP(pp_gelem)
{
GV *gv;
SV *sv;
SV *ref;
char *elem;
dSP;
sv = POPs;
elem = SvPV(sv, na);
gv = (GV*)POPs;
ref = Nullsv;
sv = Nullsv;
switch (elem ? *elem : '\0')
{
case 'A':
if (strEQ(elem, "ARRAY"))
ref = (SV*)GvAV(gv);
break;
case 'C':
if (strEQ(elem, "CODE"))
ref = (SV*)GvCVu(gv);
break;
case 'F':
if (strEQ(elem, "FILEHANDLE")) /* XXX deprecate in 5.005 */
ref = (SV*)GvIOp(gv);
break;
case 'G':
if (strEQ(elem, "GLOB"))
ref = (SV*)gv;
break;
case 'H':
if (strEQ(elem, "HASH"))
ref = (SV*)GvHV(gv);
break;
case 'I':
if (strEQ(elem, "IO"))
ref = (SV*)GvIOp(gv);
break;
case 'N':
if (strEQ(elem, "NAME"))
sv = newSVpv(GvNAME(gv), GvNAMELEN(gv));
break;
case 'P':
if (strEQ(elem, "PACKAGE"))
sv = newSVpv(HvNAME(GvSTASH(gv)), 0);
break;
case 'S':
if (strEQ(elem, "SCALAR"))
ref = GvSV(gv);
break;
}
if (ref)
sv = newRV(ref);
if (sv)
sv_2mortal(sv);
else
sv = &sv_undef;
XPUSHs(sv);
RETURN;
}
PP(pp_and)
{
dSP;
if (!SvTRUE(TOPs))
RETURN;
else {
--SP;
RETURNOP(cLOGOP->op_other);
}
}
PP(pp_sassign)
{
dSP; dPOPTOPssrl;
MAGIC *mg;
if (op->op_private & OPpASSIGN_BACKWARDS) {
SV *temp;
temp = left; left = right; right = temp;
}
if (tainting && tainted && !SvTAINTED(left))
TAINT_NOT;
SvSetSV(right, left);
SvSETMAGIC(right);
SETs(right);
RETURN;
}
PP(pp_cond_expr)
{
dSP;
if (SvTRUEx(POPs))
RETURNOP(cCONDOP->op_true);
else
RETURNOP(cCONDOP->op_false);
}
PP(pp_unstack)
{
I32 oldsave;
TAINT_NOT; /* Each statement is presumed innocent */
stack_sp = stack_base + cxstack[cxstack_ix].blk_oldsp;
FREETMPS;
oldsave = scopestack[scopestack_ix - 1];
LEAVE_SCOPE(oldsave);
return NORMAL;
}
PP(pp_concat)
{
dSP; dATARGET; tryAMAGICbin(concat,opASSIGN);
{
dPOPTOPssrl;
STRLEN len;
char *s;
if (TARG != left) {
s = SvPV(left,len);
sv_setpvn(TARG,s,len);
}
else if (SvGMAGICAL(TARG))
mg_get(TARG);
else if (!SvOK(TARG) && SvTYPE(TARG) <= SVt_PVMG) {
sv_setpv(TARG, ""); /* Suppress warning. */
s = SvPV_force(TARG, len);
}
s = SvPV(right,len);
sv_catpvn(TARG,s,len);
SETTARG;
RETURN;
}
}
PP(pp_padsv)
{
dSP; dTARGET;
XPUSHs(TARG);
if (op->op_flags & OPf_MOD) {
if (op->op_private & OPpLVAL_INTRO)
SAVECLEARSV(curpad[op->op_targ]);
else if (op->op_private & OPpDEREF)
provide_ref(op, curpad[op->op_targ]);
}
RETURN;
}
PP(pp_readline)
{
last_in_gv = (GV*)(*stack_sp--);
return do_readline();
}
PP(pp_eq)
{
dSP; tryAMAGICbinSET(eq,0);
{
dPOPnv;
SETs((TOPn == value) ? &sv_yes : &sv_no);
RETURN;
}
}
PP(pp_preinc)
{
dSP;
if (SvREADONLY(TOPs))
croak(no_modify);
if (SvIOK(TOPs) && !SvNOK(TOPs) && !SvPOK(TOPs) &&
SvIVX(TOPs) != IV_MAX)
{
++SvIVX(TOPs);
SvFLAGS(TOPs) &= ~(SVp_NOK|SVp_POK);
}
else
sv_inc(TOPs);
SvSETMAGIC(TOPs);
return NORMAL;
}
PP(pp_or)
{
dSP;
if (SvTRUE(TOPs))
RETURN;
else {
--SP;
RETURNOP(cLOGOP->op_other);
}
}
PP(pp_add)
{
dSP; dATARGET; tryAMAGICbin(add,opASSIGN);
{
dPOPTOPnnrl_ul;
SETn( left + right );
RETURN;
}
}
PP(pp_aelemfast)
{
dSP;
AV *av = GvAV((GV*)cSVOP->op_sv);
SV** svp = av_fetch(av, op->op_private, op->op_flags & OPf_MOD);
PUSHs(svp ? *svp : &sv_undef);
RETURN;
}
PP(pp_join)
{
dSP; dMARK; dTARGET;
MARK++;
do_join(TARG, *MARK, MARK, SP);
SP = MARK;
SETs(TARG);
RETURN;
}
PP(pp_pushre)
{
dSP;
#ifdef DEBUGGING
/*
* We ass_u_me that LvTARGOFF() comes first, and that two STRLENs
* will be enough to hold an OP*.
*/
SV* sv = sv_newmortal();
sv_upgrade(sv, SVt_PVLV);
LvTYPE(sv) = '/';
Copy(&op, &LvTARGOFF(sv), 1, OP*);
XPUSHs(sv);
#else
XPUSHs((SV*)op);
#endif
RETURN;
}
/* Oversized hot code. */
PP(pp_print)
{
dSP; dMARK; dORIGMARK;
GV *gv;
IO *io;
register PerlIO *fp;
MAGIC *mg;
if (op->op_flags & OPf_STACKED)
gv = (GV*)*++MARK;
else
gv = defoutgv;
if (SvMAGICAL(gv) && (mg = mg_find((SV*)gv, 'q'))) {
SV *sv;
PUSHMARK(MARK-1);
*MARK = mg->mg_obj;
ENTER;
perl_call_method("PRINT", G_SCALAR);
LEAVE;
SPAGAIN;
sv = POPs;
SP = ORIGMARK;
PUSHs(sv);
RETURN;
}
if (!(io = GvIO(gv))) {
if (dowarn) {
SV* sv = sv_newmortal();
gv_fullname3(sv, gv, Nullch);
warn("Filehandle %s never opened", SvPV(sv,na));
}
SETERRNO(EBADF,RMS$_IFI);
goto just_say_no;
}
else if (!(fp = IoOFP(io))) {
if (dowarn) {
SV* sv = sv_newmortal();
gv_fullname3(sv, gv, Nullch);
if (IoIFP(io))
warn("Filehandle %s opened only for input", SvPV(sv,na));
else
warn("print on closed filehandle %s", SvPV(sv,na));
}
SETERRNO(EBADF,IoIFP(io)?RMS$_FAC:RMS$_IFI);
goto just_say_no;
}
else {
MARK++;
if (ofslen) {
while (MARK <= SP) {
if (!do_print(*MARK, fp))
break;
MARK++;
if (MARK <= SP) {
if (PerlIO_write(fp, ofs, ofslen) == 0 || PerlIO_error(fp)) {
MARK--;
break;
}
}
}
}
else {
while (MARK <= SP) {
if (!do_print(*MARK, fp))
break;
MARK++;
}
}
if (MARK <= SP)
goto just_say_no;
else {
if (orslen)
if (PerlIO_write(fp, ors, orslen) == 0 || PerlIO_error(fp))
goto just_say_no;
if (IoFLAGS(io) & IOf_FLUSH)
if (PerlIO_flush(fp) == EOF)
goto just_say_no;
}
}
SP = ORIGMARK;
PUSHs(&sv_yes);
RETURN;
just_say_no:
SP = ORIGMARK;
PUSHs(&sv_undef);
RETURN;
}
PP(pp_rv2av)
{
dSP; dPOPss;
AV *av;
if (SvROK(sv)) {
wasref:
av = (AV*)SvRV(sv);
if (SvTYPE(av) != SVt_PVAV)
DIE("Not an ARRAY reference");
if (op->op_private & OPpLVAL_INTRO)
av = (AV*)save_svref((SV**)sv);
if (op->op_flags & OPf_REF) {
PUSHs((SV*)av);
RETURN;
}
}
else {
if (SvTYPE(sv) == SVt_PVAV) {
av = (AV*)sv;
if (op->op_flags & OPf_REF) {
PUSHs((SV*)av);
RETURN;
}
}
else {
GV *gv;
if (SvTYPE(sv) != SVt_PVGV) {
char *sym;
if (SvGMAGICAL(sv)) {
mg_get(sv);
if (SvROK(sv))
goto wasref;
}
if (!SvOK(sv)) {
if (op->op_flags & OPf_REF ||
op->op_private & HINT_STRICT_REFS)
DIE(no_usym, "an ARRAY");
if (GIMME == G_ARRAY)
RETURN;
RETPUSHUNDEF;
}
sym = SvPV(sv,na);
if (op->op_private & HINT_STRICT_REFS)
DIE(no_symref, sym, "an ARRAY");
gv = (GV*)gv_fetchpv(sym, TRUE, SVt_PVAV);
} else {
gv = (GV*)sv;
}
av = GvAVn(gv);
if (op->op_private & OPpLVAL_INTRO)
av = save_ary(gv);
if (op->op_flags & OPf_REF) {
PUSHs((SV*)av);
RETURN;
}
}
}
if (GIMME == G_ARRAY) {
I32 maxarg = AvFILL(av) + 1;
EXTEND(SP, maxarg);
Copy(AvARRAY(av), SP+1, maxarg, SV*);
SP += maxarg;
}
else {
dTARGET;
I32 maxarg = AvFILL(av) + 1;
PUSHi(maxarg);
}
RETURN;
}
PP(pp_rv2hv)
{
dSP; dTOPss;
HV *hv;
if (SvROK(sv)) {
wasref:
hv = (HV*)SvRV(sv);
if (SvTYPE(hv) != SVt_PVHV)
DIE("Not a HASH reference");
if (op->op_private & OPpLVAL_INTRO)
hv = (HV*)save_svref((SV**)sv);
if (op->op_flags & OPf_REF) {
SETs((SV*)hv);
RETURN;
}
}
else {
if (SvTYPE(sv) == SVt_PVHV) {
hv = (HV*)sv;
if (op->op_flags & OPf_REF) {
SETs((SV*)hv);
RETURN;
}
}
else {
GV *gv;
if (SvTYPE(sv) != SVt_PVGV) {
char *sym;
if (SvGMAGICAL(sv)) {
mg_get(sv);
if (SvROK(sv))
goto wasref;
}
if (!SvOK(sv)) {
if (op->op_flags & OPf_REF ||
op->op_private & HINT_STRICT_REFS)
DIE(no_usym, "a HASH");
if (GIMME == G_ARRAY) {
SP--;
RETURN;
}
RETSETUNDEF;
}
sym = SvPV(sv,na);
if (op->op_private & HINT_STRICT_REFS)
DIE(no_symref, sym, "a HASH");
gv = (GV*)gv_fetchpv(sym, TRUE, SVt_PVHV);
} else {
gv = (GV*)sv;
}
hv = GvHVn(gv);
if (op->op_private & OPpLVAL_INTRO)
hv = save_hash(gv);
if (op->op_flags & OPf_REF) {
SETs((SV*)hv);
RETURN;
}
}
}
if (GIMME == G_ARRAY) { /* array wanted */
*stack_sp = (SV*)hv;
return do_kv(ARGS);
}
else {
dTARGET;
if (HvFILL(hv)) {
sprintf(buf, "%ld/%ld", (long)HvFILL(hv), (long)HvMAX(hv)+1);
sv_setpv(TARG, buf);
}
else
sv_setiv(TARG, 0);
SETTARG;
RETURN;
}
}
PP(pp_aassign)
{
dSP;
SV **lastlelem = stack_sp;
SV **lastrelem = stack_base + POPMARK;
SV **firstrelem = stack_base + POPMARK + 1;
SV **firstlelem = lastrelem + 1;
register SV **relem;
register SV **lelem;
register SV *sv;
register AV *ary;
HV *hash;
I32 i;
int magic;
delaymagic = DM_DELAY; /* catch simultaneous items */
/* If there's a common identifier on both sides we have to take
* special care that assigning the identifier on the left doesn't
* clobber a value on the right that's used later in the list.
*/
if (op->op_private & OPpASSIGN_COMMON) {
for (relem = firstrelem; relem <= lastrelem; relem++) {
/*SUPPRESS 560*/
if (sv = *relem)
*relem = sv_mortalcopy(sv);
}
}
relem = firstrelem;
lelem = firstlelem;
ary = Null(AV*);
hash = Null(HV*);
while (lelem <= lastlelem) {
TAINT_NOT; /* Each item stands on its own, taintwise. */
sv = *lelem++;
switch (SvTYPE(sv)) {
case SVt_PVAV:
ary = (AV*)sv;
magic = SvMAGICAL(ary) != 0;
av_clear(ary);
av_extend(ary, lastrelem - relem);
i = 0;
while (relem <= lastrelem) { /* gobble up all the rest */
sv = NEWSV(28,0);
assert(*relem);
sv_setsv(sv,*relem);
*(relem++) = sv;
(void)av_store(ary,i++,sv);
if (magic)
mg_set(sv);
TAINT_NOT;
}
break;
case SVt_PVHV: {
SV *tmpstr;
hash = (HV*)sv;
magic = SvMAGICAL(hash) != 0;
hv_clear(hash);
while (relem < lastrelem) { /* gobble up all the rest */
STRLEN len;
if (*relem)
sv = *(relem++);
else
sv = &sv_no, relem++;
tmpstr = NEWSV(29,0);
if (*relem)
sv_setsv(tmpstr,*relem); /* value */
*(relem++) = tmpstr;
(void)hv_store_ent(hash,sv,tmpstr,0);
if (magic)
mg_set(tmpstr);
TAINT_NOT;
}
if (relem == lastrelem)
warn("Odd number of elements in hash list");
}
break;
default:
if (SvTHINKFIRST(sv)) {
if (SvREADONLY(sv) && curcop != &compiling) {
if (sv != &sv_undef && sv != &sv_yes && sv != &sv_no)
DIE(no_modify);
if (relem <= lastrelem)
relem++;
break;
}
if (SvROK(sv))
sv_unref(sv);
}
if (relem <= lastrelem) {
sv_setsv(sv, *relem);
*(relem++) = sv;
}
else
sv_setsv(sv, &sv_undef);
SvSETMAGIC(sv);
break;
}
}
if (delaymagic & ~DM_DELAY) {
if (delaymagic & DM_UID) {
#ifdef HAS_SETRESUID
(void)setresuid(uid,euid,(Uid_t)-1);
#else
# ifdef HAS_SETREUID
(void)setreuid(uid,euid);
# else
# ifdef HAS_SETRUID
if ((delaymagic & DM_UID) == DM_RUID) {
(void)setruid(uid);
delaymagic &= ~DM_RUID;
}
# endif /* HAS_SETRUID */
# ifdef HAS_SETEUID
if ((delaymagic & DM_UID) == DM_EUID) {
(void)seteuid(uid);
delaymagic &= ~DM_EUID;
}
# endif /* HAS_SETEUID */
if (delaymagic & DM_UID) {
if (uid != euid)
DIE("No setreuid available");
(void)setuid(uid);
}
# endif /* HAS_SETREUID */
#endif /* HAS_SETRESUID */
uid = (int)getuid();
euid = (int)geteuid();
}
if (delaymagic & DM_GID) {
#ifdef HAS_SETRESGID
(void)setresgid(gid,egid,(Gid_t)-1);
#else
# ifdef HAS_SETREGID
(void)setregid(gid,egid);
# else
# ifdef HAS_SETRGID
if ((delaymagic & DM_GID) == DM_RGID) {
(void)setrgid(gid);
delaymagic &= ~DM_RGID;
}
# endif /* HAS_SETRGID */
# ifdef HAS_SETEGID
if ((delaymagic & DM_GID) == DM_EGID) {
(void)setegid(gid);
delaymagic &= ~DM_EGID;
}
# endif /* HAS_SETEGID */
if (delaymagic & DM_GID) {
if (gid != egid)
DIE("No setregid available");
(void)setgid(gid);
}
# endif /* HAS_SETREGID */
#endif /* HAS_SETRESGID */
gid = (int)getgid();
egid = (int)getegid();
}
tainting |= (uid && (euid != uid || egid != gid));
}
delaymagic = 0;
if (GIMME == G_ARRAY) {
if (ary || hash)
SP = lastrelem;
else
SP = firstrelem + (lastlelem - firstlelem);
lelem = firstlelem + (relem - firstrelem);
while (relem <= SP)
*relem++ = (lelem <= lastlelem) ? *lelem++ : &sv_undef;
RETURN;
}
else {
dTARGET;
SP = firstrelem;
SETi(lastrelem - firstrelem + 1);
RETURN;
}
}
PP(pp_match)
{
dSP; dTARG;
register PMOP *pm = cPMOP;
register char *t;
register char *s;
char *strend;
I32 global;
I32 safebase;
char *truebase;
register REGEXP *rx = pm->op_pmregexp;
I32 gimme = GIMME;
STRLEN len;
I32 minmatch = 0;
I32 oldsave = savestack_ix;
I32 update_minmatch = 1;
if (op->op_flags & OPf_STACKED)
TARG = POPs;
else {
TARG = GvSV(defgv);
EXTEND(SP,1);
}
s = SvPV(TARG, len);
strend = s + len;
if (!s)
DIE("panic: do_match");
TAINT_NOT;
if (pm->op_pmflags & PMf_USED) {
if (gimme == G_ARRAY)
RETURN;
RETPUSHNO;
}
if (!rx->prelen && curpm) {
pm = curpm;
rx = pm->op_pmregexp;
}
truebase = t = s;
if (global = pm->op_pmflags & PMf_GLOBAL) {
rx->startp[0] = 0;
if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG)) {
MAGIC* mg = mg_find(TARG, 'g');
if (mg && mg->mg_len >= 0) {
rx->endp[0] = rx->startp[0] = s + mg->mg_len;
minmatch = (mg->mg_flags & MGf_MINMATCH);
update_minmatch = 0;
}
}
}
if (!rx->nparens && !global)
gimme = G_SCALAR; /* accidental array context? */
safebase = (((gimme == G_ARRAY) || global) && !sawampersand);
if (pm->op_pmflags & (PMf_MULTILINE|PMf_SINGLELINE)) {
SAVEINT(multiline);
multiline = pm->op_pmflags & PMf_MULTILINE;
}
play_it_again:
if (global && rx->startp[0]) {
t = s = rx->endp[0];
if (s >= strend)
goto nope;
if (update_minmatch++)
minmatch = (s == rx->startp[0]);
}
if (pm->op_pmshort) {
if (pm->op_pmflags & PMf_SCANFIRST) {
if (SvSCREAM(TARG)) {
if (screamfirst[BmRARE(pm->op_pmshort)] < 0)
goto nope;
else if (!(s = screaminstr(TARG, pm->op_pmshort)))
goto nope;
else if (pm->op_pmflags & PMf_ALL)
goto yup;
}
else if (!(s = fbm_instr((unsigned char*)s,
(unsigned char*)strend, pm->op_pmshort)))
goto nope;
else if (pm->op_pmflags & PMf_ALL)
goto yup;
if (s && rx->regback >= 0) {
++BmUSEFUL(pm->op_pmshort);
s -= rx->regback;
if (s < t)
s = t;
}
else
s = t;
}
else if (!multiline) {
if (*SvPVX(pm->op_pmshort) != *s
|| (pm->op_pmslen > 1
&& memNE(SvPVX(pm->op_pmshort), s, pm->op_pmslen)))
goto nope;
}
if (!rx->naughty && --BmUSEFUL(pm->op_pmshort) < 0) {
SvREFCNT_dec(pm->op_pmshort);
pm->op_pmshort = Nullsv; /* opt is being useless */
}
}
if (pregexec(rx, s, strend, truebase, minmatch,
SvSCREAM(TARG) ? TARG : Nullsv, safebase))
{
curpm = pm;
if (pm->op_pmflags & PMf_ONCE)
pm->op_pmflags |= PMf_USED;
goto gotcha;
}
else
goto ret_no;
/*NOTREACHED*/
gotcha:
TAINT_IF(rx->exec_tainted);
if (gimme == G_ARRAY) {
I32 iters, i, len;
iters = rx->nparens;
if (global && !iters)
i = 1;
else
i = 0;
EXTEND(SP, iters + i);
EXTEND_MORTAL(iters + i);
for (i = !i; i <= iters; i++) {
PUSHs(sv_newmortal());
/*SUPPRESS 560*/
if ((s = rx->startp[i]) && rx->endp[i] ) {
len = rx->endp[i] - s;
sv_setpvn(*SP, s, len);
}
}
if (global) {
truebase = rx->subbeg;
strend = rx->subend;
if (rx->startp[0] && rx->startp[0] == rx->endp[0])
++rx->endp[0];
goto play_it_again;
}
LEAVE_SCOPE(oldsave);
RETURN;
}
else {
if (global) {
MAGIC* mg = 0;
if (SvTYPE(TARG) >= SVt_PVMG && SvMAGIC(TARG))
mg = mg_find(TARG, 'g');
if (!mg) {
sv_magic(TARG, (SV*)0, 'g', Nullch, 0);
mg = mg_find(TARG, 'g');
}
if (rx->startp[0]) {
mg->mg_len = rx->endp[0] - rx->subbeg;
if (rx->startp[0] == rx->endp[0])
mg->mg_flags |= MGf_MINMATCH;
else
mg->mg_flags &= ~MGf_MINMATCH;
}
}
LEAVE_SCOPE(oldsave);
RETPUSHYES;
}
yup:
TAINT_IF(rx->exec_tainted);
++BmUSEFUL(pm->op_pmshort);
curpm = pm;
if (pm->op_pmflags & PMf_ONCE)
pm->op_pmflags |= PMf_USED;
Safefree(rx->subbase);
rx->subbase = Nullch;
if (global) {
rx->subbeg = truebase;
rx->subend = strend;
rx->startp[0] = s;
rx->endp[0] = s + SvCUR(pm->op_pmshort);
goto gotcha;
}
if (sawampersand) {
char *tmps;
tmps = rx->subbase = savepvn(t, strend-t);
rx->subbeg = tmps;
rx->subend = tmps + (strend-t);
tmps = rx->startp[0] = tmps + (s - t);
rx->endp[0] = tmps + SvCUR(pm->op_pmshort);
}
LEAVE_SCOPE(oldsave);
RETPUSHYES;
nope:
if (pm->op_pmshort)
++BmUSEFUL(pm->op_pmshort);
ret_no:
LEAVE_SCOPE(oldsave);
if (gimme == G_ARRAY)
RETURN;
RETPUSHNO;
}
OP *
do_readline()
{
dSP; dTARGETSTACKED;
register SV *sv;
STRLEN tmplen = 0;
STRLEN offset;
PerlIO *fp;
register IO *io = GvIO(last_in_gv);
register I32 type = op->op_type;
MAGIC *mg;
if (SvMAGICAL(last_in_gv) && (mg = mg_find((SV*)last_in_gv, 'q'))) {
PUSHMARK(SP);
XPUSHs(mg->mg_obj);
PUTBACK;
ENTER;
perl_call_method("READLINE", GIMME);
LEAVE;
SPAGAIN;
if (GIMME == G_SCALAR)
SvSetSV_nosteal(TARG, TOPs);
RETURN;
}
fp = Nullfp;
if (io) {
fp = IoIFP(io);
if (!fp) {
if (IoFLAGS(io) & IOf_ARGV) {
if (IoFLAGS(io) & IOf_START) {
IoFLAGS(io) &= ~IOf_START;
IoLINES(io) = 0;
if (av_len(GvAVn(last_in_gv)) < 0) {
SV *tmpstr = newSVpv("-", 1); /* assume stdin */
av_push(GvAVn(last_in_gv), tmpstr);
}
}
fp = nextargv(last_in_gv);
if (!fp) { /* Note: fp != IoIFP(io) */
(void)do_close(last_in_gv, FALSE); /* now it does*/
IoFLAGS(io) |= IOf_START;