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ListUtil.xs
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ListUtil.xs
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/* Copyright (c) 1997-2000 Graham Barr <[email protected]>. All rights reserved.
* This program is free software; you can redistribute it and/or
* modify it under the same terms as Perl itself.
*/
#define PERL_NO_GET_CONTEXT /* we want efficiency */
#include <EXTERN.h>
#include <perl.h>
#include <XSUB.h>
#ifdef USE_PPPORT_H
# define NEED_sv_2pv_flags 1
# define NEED_newSVpvn_flags 1
# define NEED_sv_catpvn_flags
# include "ppport.h"
#endif
/* For uniqnum, define ACTUAL_NVSIZE to be the number *
* of bytes that are actually used to store the NV */
#if defined(USE_LONG_DOUBLE) && LDBL_MANT_DIG == 64
# define ACTUAL_NVSIZE 10
#else
# define ACTUAL_NVSIZE NVSIZE
#endif
/* Detect "DoubleDouble" nvtype */
#if defined(USE_LONG_DOUBLE) && LDBL_MANT_DIG == 106
# define NV_IS_DOUBLEDOUBLE
#endif
#ifndef PERL_VERSION_DECIMAL
# define PERL_VERSION_DECIMAL(r,v,s) (r*1000000 + v*1000 + s)
#endif
#ifndef PERL_DECIMAL_VERSION
# define PERL_DECIMAL_VERSION \
PERL_VERSION_DECIMAL(PERL_REVISION,PERL_VERSION,PERL_SUBVERSION)
#endif
#ifndef PERL_VERSION_GE
# define PERL_VERSION_GE(r,v,s) \
(PERL_DECIMAL_VERSION >= PERL_VERSION_DECIMAL(r,v,s))
#endif
#ifndef PERL_VERSION_LE
# define PERL_VERSION_LE(r,v,s) \
(PERL_DECIMAL_VERSION <= PERL_VERSION_DECIMAL(r,v,s))
#endif
#if PERL_VERSION_GE(5,6,0)
# include "multicall.h"
#endif
#if !PERL_VERSION_GE(5,23,8)
# define UNUSED_VAR_newsp PERL_UNUSED_VAR(newsp)
#else
# define UNUSED_VAR_newsp NOOP
#endif
#ifndef CvISXSUB
# define CvISXSUB(cv) CvXSUB(cv)
#endif
#ifndef HvNAMELEN_get
#define HvNAMELEN_get(stash) strlen(HvNAME(stash))
#endif
#ifndef HvNAMEUTF8
#define HvNAMEUTF8(stash) 0
#endif
#ifndef GvNAMEUTF8
#ifdef GvNAME_HEK
#define GvNAMEUTF8(gv) HEK_UTF8(GvNAME_HEK(gv))
#else
#define GvNAMEUTF8(gv) 0
#endif
#endif
#ifndef SV_CATUTF8
#define SV_CATUTF8 0
#endif
#ifndef SV_CATBYTES
#define SV_CATBYTES 0
#endif
#ifndef sv_catpvn_flags
#define sv_catpvn_flags(b,n,l,f) sv_catpvn(b,n,l)
#endif
#if !PERL_VERSION_GE(5,8,3)
static NV Perl_ceil(NV nv) {
return -Perl_floor(-nv);
}
#endif
/* Some platforms have strict exports. And before 5.7.3 cxinc (or Perl_cxinc)
was not exported. Therefore platforms like win32, VMS etc have problems
so we redefine it here -- GMB
*/
#if !PERL_VERSION_GE(5,7,0)
/* Not in 5.6.1. */
# ifdef cxinc
# undef cxinc
# endif
# define cxinc() my_cxinc(aTHX)
static I32
my_cxinc(pTHX)
{
cxstack_max = cxstack_max * 3 / 2;
Renew(cxstack, cxstack_max + 1, struct context); /* fencepost bug in older CXINC macros requires +1 here */
return cxstack_ix + 1;
}
#endif
#ifndef sv_copypv
#define sv_copypv(a, b) my_sv_copypv(aTHX_ a, b)
static void
my_sv_copypv(pTHX_ SV *const dsv, SV *const ssv)
{
STRLEN len;
const char * const s = SvPV_const(ssv,len);
sv_setpvn(dsv,s,len);
if(SvUTF8(ssv))
SvUTF8_on(dsv);
else
SvUTF8_off(dsv);
}
#endif
#ifdef SVf_IVisUV
# define slu_sv_value(sv) (SvIOK(sv)) ? (SvIOK_UV(sv)) ? (NV)(SvUVX(sv)) : (NV)(SvIVX(sv)) : (SvNV(sv))
#else
# define slu_sv_value(sv) (SvIOK(sv)) ? (NV)(SvIVX(sv)) : (SvNV(sv))
#endif
#if PERL_VERSION < 13 || (PERL_VERSION == 13 && PERL_SUBVERSION < 9)
# define PERL_HAS_BAD_MULTICALL_REFCOUNT
#endif
#ifndef SvNV_nomg
# define SvNV_nomg SvNV
#endif
#if PERL_VERSION_GE(5,16,0)
# define HAVE_UNICODE_PACKAGE_NAMES
# ifndef sv_sethek
# define sv_sethek(a, b) Perl_sv_sethek(aTHX_ a, b)
# endif
# ifndef sv_ref
# define sv_ref(dst, sv, ob) my_sv_ref(aTHX_ dst, sv, ob)
static SV *
my_sv_ref(pTHX_ SV *dst, const SV *sv, int ob)
{
/* cargoculted from perl 5.22's sv.c */
if(!dst)
dst = sv_newmortal();
if(ob && SvOBJECT(sv)) {
if(HvNAME_get(SvSTASH(sv)))
sv_sethek(dst, HvNAME_HEK(SvSTASH(sv)));
else
sv_setpvs(dst, "__ANON__");
}
else {
const char *reftype = sv_reftype(sv, 0);
sv_setpv(dst, reftype);
}
return dst;
}
# endif
#endif /* HAVE_UNICODE_PACKAGE_NAMES */
enum slu_accum {
ACC_IV,
ACC_NV,
ACC_SV,
};
static enum slu_accum accum_type(SV *sv) {
if(SvAMAGIC(sv))
return ACC_SV;
if(SvIOK(sv) && !SvNOK(sv) && !SvUOK(sv))
return ACC_IV;
return ACC_NV;
}
/* Magic for set_subname */
static MGVTBL subname_vtbl;
static void MY_initrand(pTHX)
{
#if (PERL_VERSION < 9)
struct op dmy_op;
struct op *old_op = PL_op;
/* We call pp_rand here so that Drand01 get initialized if rand()
or srand() has not already been called
*/
memzero((char*)(&dmy_op), sizeof(struct op));
/* we let pp_rand() borrow the TARG allocated for this XS sub */
dmy_op.op_targ = PL_op->op_targ;
PL_op = &dmy_op;
(void)*(PL_ppaddr[OP_RAND])(aTHX);
PL_op = old_op;
#else
/* Initialize Drand01 if rand() or srand() has
not already been called
*/
if(!PL_srand_called) {
(void)seedDrand01((Rand_seed_t)Perl_seed(aTHX));
PL_srand_called = TRUE;
}
#endif
}
static double MY_callrand(pTHX_ CV *randcv)
{
dSP;
double ret, dummy;
ENTER;
PUSHMARK(SP);
PUTBACK;
call_sv((SV *)randcv, G_SCALAR);
SPAGAIN;
ret = modf(POPn, &dummy); /* bound to < 1 */
if(ret < 0) ret += 1.0; /* bound to 0 <= ret < 1 */
LEAVE;
return ret;
}
#define sv_to_cv(sv, subname) MY_sv_to_cv(aTHX_ sv, subname);
static CV* MY_sv_to_cv(pTHX_ SV* sv, const char * const subname)
{
GV *gv;
HV *stash;
CV *cv = sv_2cv(sv, &stash, &gv, 0);
if(cv == Nullcv)
croak("Not a subroutine reference");
if(!CvROOT(cv) && !CvXSUB(cv))
croak("Undefined subroutine in %s", subname);
return cv;
}
enum {
ZIP_SHORTEST = 1,
ZIP_LONGEST = 2,
ZIP_MESH = 4,
ZIP_MESH_LONGEST = ZIP_MESH|ZIP_LONGEST,
ZIP_MESH_SHORTEST = ZIP_MESH|ZIP_SHORTEST,
};
MODULE=List::Util PACKAGE=List::Util
void
min(...)
PROTOTYPE: @
ALIAS:
min = 0
max = 1
CODE:
{
int index;
NV retval = 0.0; /* avoid 'uninit var' warning */
SV *retsv;
int magic;
if(!items)
XSRETURN_UNDEF;
retsv = ST(0);
SvGETMAGIC(retsv);
magic = SvAMAGIC(retsv);
if(!magic)
retval = slu_sv_value(retsv);
for(index = 1 ; index < items ; index++) {
SV *stacksv = ST(index);
SV *tmpsv;
SvGETMAGIC(stacksv);
if((magic || SvAMAGIC(stacksv)) && (tmpsv = amagic_call(retsv, stacksv, gt_amg, 0))) {
if(SvTRUE(tmpsv) ? !ix : ix) {
retsv = stacksv;
magic = SvAMAGIC(retsv);
if(!magic) {
retval = slu_sv_value(retsv);
}
}
}
else {
NV val = slu_sv_value(stacksv);
if(magic) {
retval = slu_sv_value(retsv);
magic = 0;
}
if(val < retval ? !ix : ix) {
retsv = stacksv;
retval = val;
}
}
}
ST(0) = retsv;
XSRETURN(1);
}
void
sum(...)
PROTOTYPE: @
ALIAS:
sum = 0
sum0 = 1
product = 2
CODE:
{
dXSTARG;
SV *sv;
IV retiv = 0;
NV retnv = 0.0;
SV *retsv = NULL;
int index;
enum slu_accum accum;
int is_product = (ix == 2);
SV *tmpsv;
if(!items)
switch(ix) {
case 0: XSRETURN_UNDEF;
case 1: ST(0) = sv_2mortal(newSViv(0)); XSRETURN(1);
case 2: ST(0) = sv_2mortal(newSViv(1)); XSRETURN(1);
}
sv = ST(0);
SvGETMAGIC(sv);
switch((accum = accum_type(sv))) {
case ACC_SV:
retsv = TARG;
sv_setsv(retsv, sv);
break;
case ACC_IV:
retiv = SvIV(sv);
break;
case ACC_NV:
retnv = slu_sv_value(sv);
break;
}
for(index = 1 ; index < items ; index++) {
sv = ST(index);
SvGETMAGIC(sv);
if(accum < ACC_SV && SvAMAGIC(sv)){
if(!retsv)
retsv = TARG;
sv_setnv(retsv, accum == ACC_NV ? retnv : retiv);
accum = ACC_SV;
}
switch(accum) {
case ACC_SV:
tmpsv = amagic_call(retsv, sv,
is_product ? mult_amg : add_amg,
SvAMAGIC(retsv) ? AMGf_assign : 0);
if(tmpsv) {
switch((accum = accum_type(tmpsv))) {
case ACC_SV:
retsv = tmpsv;
break;
case ACC_IV:
retiv = SvIV(tmpsv);
break;
case ACC_NV:
retnv = slu_sv_value(tmpsv);
break;
}
}
else {
/* fall back to default */
accum = ACC_NV;
is_product ? (retnv = SvNV(retsv) * SvNV(sv))
: (retnv = SvNV(retsv) + SvNV(sv));
}
break;
case ACC_IV:
if(is_product) {
/* TODO: Consider if product() should shortcircuit the moment its
* accumulator becomes zero
*/
/* XXX testing flags before running get_magic may
* cause some valid tied values to fallback to the NV path
* - DAPM */
if(!SvNOK(sv) && SvIOK(sv)) {
IV i = SvIV(sv);
if (retiv == 0) /* avoid later division by zero */
break;
if (retiv < -1) { /* avoid -1 because that causes SIGFPE */
if (i < 0) {
if (i >= IV_MAX / retiv) {
retiv *= i;
break;
}
}
else {
if (i <= IV_MIN / retiv) {
retiv *= i;
break;
}
}
}
else if (retiv > 0) {
if (i < 0) {
if (i >= IV_MIN / retiv) {
retiv *= i;
break;
}
}
else {
if (i <= IV_MAX / retiv) {
retiv *= i;
break;
}
}
}
}
/* else fallthrough */
}
else {
/* XXX testing flags before running get_magic may
* cause some valid tied values to fallback to the NV path
* - DAPM */
if(!SvNOK(sv) && SvIOK(sv)) {
IV i = SvIV(sv);
if (retiv >= 0 && i >= 0) {
if (retiv <= IV_MAX - i) {
retiv += i;
break;
}
/* else fallthrough */
}
else if (retiv < 0 && i < 0) {
if (retiv >= IV_MIN - i) {
retiv += i;
break;
}
/* else fallthrough */
}
else {
/* mixed signs can't overflow */
retiv += i;
break;
}
}
/* else fallthrough */
}
retnv = retiv;
accum = ACC_NV;
/* FALLTHROUGH */
case ACC_NV:
is_product ? (retnv *= slu_sv_value(sv))
: (retnv += slu_sv_value(sv));
break;
}
}
if(!retsv)
retsv = TARG;
switch(accum) {
case ACC_SV: /* nothing to do */
break;
case ACC_IV:
sv_setiv(retsv, retiv);
break;
case ACC_NV:
sv_setnv(retsv, retnv);
break;
}
ST(0) = retsv;
XSRETURN(1);
}
#define SLU_CMP_LARGER 1
#define SLU_CMP_SMALLER -1
void
minstr(...)
PROTOTYPE: @
ALIAS:
minstr = SLU_CMP_LARGER
maxstr = SLU_CMP_SMALLER
CODE:
{
SV *left;
int index;
if(!items)
XSRETURN_UNDEF;
left = ST(0);
#ifdef OPpLOCALE
if(MAXARG & OPpLOCALE) {
for(index = 1 ; index < items ; index++) {
SV *right = ST(index);
if(sv_cmp_locale(left, right) == ix)
left = right;
}
}
else {
#endif
for(index = 1 ; index < items ; index++) {
SV *right = ST(index);
if(sv_cmp(left, right) == ix)
left = right;
}
#ifdef OPpLOCALE
}
#endif
ST(0) = left;
XSRETURN(1);
}
void
reduce(block,...)
SV *block
PROTOTYPE: &@
ALIAS:
reduce = 0
reductions = 1
CODE:
{
SV *ret = sv_newmortal();
int index;
AV *retvals = NULL;
GV *agv,*bgv;
SV **args = &PL_stack_base[ax];
CV *cv = sv_to_cv(block, ix ? "reductions" : "reduce");
if(items <= 1) {
if(ix)
XSRETURN(0);
else
XSRETURN_UNDEF;
}
agv = gv_fetchpv("a", GV_ADD, SVt_PV);
bgv = gv_fetchpv("b", GV_ADD, SVt_PV);
SAVESPTR(GvSV(agv));
SAVESPTR(GvSV(bgv));
GvSV(agv) = ret;
SvSetMagicSV(ret, args[1]);
if(ix) {
/* Precreate an AV for return values; -1 for cv, -1 for top index */
retvals = newAV();
av_extend(retvals, items-1-1);
/* so if throw an exception they can be reclaimed */
SAVEFREESV(retvals);
av_push(retvals, newSVsv(ret));
}
#ifdef dMULTICALL
assert(cv);
if(!CvISXSUB(cv)) {
dMULTICALL;
I32 gimme = G_SCALAR;
UNUSED_VAR_newsp;
PUSH_MULTICALL(cv);
for(index = 2 ; index < items ; index++) {
GvSV(bgv) = args[index];
MULTICALL;
SvSetMagicSV(ret, *PL_stack_sp);
if(ix)
av_push(retvals, newSVsv(ret));
}
# ifdef PERL_HAS_BAD_MULTICALL_REFCOUNT
if(CvDEPTH(multicall_cv) > 1)
SvREFCNT_inc_simple_void_NN(multicall_cv);
# endif
POP_MULTICALL;
}
else
#endif
{
for(index = 2 ; index < items ; index++) {
dSP;
GvSV(bgv) = args[index];
PUSHMARK(SP);
call_sv((SV*)cv, G_SCALAR);
SvSetMagicSV(ret, *PL_stack_sp);
if(ix)
av_push(retvals, newSVsv(ret));
}
}
if(ix) {
int i;
SV **svs = AvARRAY(retvals);
/* steal the SVs from retvals */
for(i = 0; i < items-1; i++) {
ST(i) = sv_2mortal(svs[i]);
svs[i] = NULL;
}
XSRETURN(items-1);
}
else {
ST(0) = ret;
XSRETURN(1);
}
}
void
first(block,...)
SV *block
PROTOTYPE: &@
CODE:
{
int index;
SV **args = &PL_stack_base[ax];
CV *cv = sv_to_cv(block, "first");
if(items <= 1)
XSRETURN_UNDEF;
SAVESPTR(GvSV(PL_defgv));
#ifdef dMULTICALL
assert(cv);
if(!CvISXSUB(cv)) {
dMULTICALL;
I32 gimme = G_SCALAR;
UNUSED_VAR_newsp;
PUSH_MULTICALL(cv);
for(index = 1 ; index < items ; index++) {
SV *def_sv = GvSV(PL_defgv) = args[index];
# ifdef SvTEMP_off
SvTEMP_off(def_sv);
# endif
MULTICALL;
if(SvTRUEx(*PL_stack_sp)) {
# ifdef PERL_HAS_BAD_MULTICALL_REFCOUNT
if(CvDEPTH(multicall_cv) > 1)
SvREFCNT_inc_simple_void_NN(multicall_cv);
# endif
POP_MULTICALL;
ST(0) = ST(index);
XSRETURN(1);
}
}
# ifdef PERL_HAS_BAD_MULTICALL_REFCOUNT
if(CvDEPTH(multicall_cv) > 1)
SvREFCNT_inc_simple_void_NN(multicall_cv);
# endif
POP_MULTICALL;
}
else
#endif
{
for(index = 1 ; index < items ; index++) {
dSP;
GvSV(PL_defgv) = args[index];
PUSHMARK(SP);
call_sv((SV*)cv, G_SCALAR);
if(SvTRUEx(*PL_stack_sp)) {
ST(0) = ST(index);
XSRETURN(1);
}
}
}
XSRETURN_UNDEF;
}
void
any(block,...)
SV *block
ALIAS:
none = 0
all = 1
any = 2
notall = 3
PROTOTYPE: &@
PPCODE:
{
int ret_true = !(ix & 2); /* return true at end of loop for none/all; false for any/notall */
int invert = (ix & 1); /* invert block test for all/notall */
SV **args = &PL_stack_base[ax];
CV *cv = sv_to_cv(block,
ix == 0 ? "none" :
ix == 1 ? "all" :
ix == 2 ? "any" :
ix == 3 ? "notall" :
"unknown 'any' alias");
SAVESPTR(GvSV(PL_defgv));
#ifdef dMULTICALL
assert(cv);
if(!CvISXSUB(cv)) {
dMULTICALL;
I32 gimme = G_SCALAR;
int index;
UNUSED_VAR_newsp;
PUSH_MULTICALL(cv);
for(index = 1; index < items; index++) {
SV *def_sv = GvSV(PL_defgv) = args[index];
# ifdef SvTEMP_off
SvTEMP_off(def_sv);
# endif
MULTICALL;
if(SvTRUEx(*PL_stack_sp) ^ invert) {
POP_MULTICALL;
ST(0) = ret_true ? &PL_sv_no : &PL_sv_yes;
XSRETURN(1);
}
}
POP_MULTICALL;
}
else
#endif
{
int index;
for(index = 1; index < items; index++) {
dSP;
GvSV(PL_defgv) = args[index];
PUSHMARK(SP);
call_sv((SV*)cv, G_SCALAR);
if(SvTRUEx(*PL_stack_sp) ^ invert) {
ST(0) = ret_true ? &PL_sv_no : &PL_sv_yes;
XSRETURN(1);
}
}
}
ST(0) = ret_true ? &PL_sv_yes : &PL_sv_no;
XSRETURN(1);
}
void
head(size,...)
PROTOTYPE: $@
ALIAS:
head = 0
tail = 1
PPCODE:
{
int size = 0;
int start = 0;
int end = 0;
int i = 0;
size = SvIV( ST(0) );
if ( ix == 0 ) {
start = 1;
end = start + size;
if ( size < 0 ) {
end += items - 1;
}
if ( end > items ) {
end = items;
}
}
else {
end = items;
if ( size < 0 ) {
start = -size + 1;
}
else {
start = end - size;
}
if ( start < 1 ) {
start = 1;
}
}
if ( end <= start ) {
XSRETURN(0);
}
else {
EXTEND( SP, end - start );
for ( i = start; i < end; i++ ) {
PUSHs( sv_2mortal( newSVsv( ST(i) ) ) );
}
XSRETURN( end - start );
}
}
void
pairs(...)
PROTOTYPE: @
PPCODE:
{
int argi = 0;
int reti = 0;
HV *pairstash = get_hv("List::Util::_Pair::", GV_ADD);
if(items % 2 && ckWARN(WARN_MISC))
warn("Odd number of elements in pairs");
{
for(; argi < items; argi += 2) {
SV *a = ST(argi);
SV *b = argi < items-1 ? ST(argi+1) : &PL_sv_undef;
AV *av = newAV();
av_push(av, newSVsv(a));
av_push(av, newSVsv(b));
ST(reti) = sv_2mortal(newRV_noinc((SV *)av));
sv_bless(ST(reti), pairstash);
reti++;
}
}
XSRETURN(reti);
}
void
unpairs(...)
PROTOTYPE: @
PPCODE:
{
/* Unlike pairs(), we're going to trash the input values on the stack
* almost as soon as we start generating output. So clone them first
*/
int i;
SV **args_copy;
Newx(args_copy, items, SV *);
SAVEFREEPV(args_copy);
Copy(&ST(0), args_copy, items, SV *);
for(i = 0; i < items; i++) {
SV *pair = args_copy[i];
AV *pairav;
SvGETMAGIC(pair);
if(SvTYPE(pair) != SVt_RV)
croak("Not a reference at List::Util::unpairs() argument %d", i);
if(SvTYPE(SvRV(pair)) != SVt_PVAV)
croak("Not an ARRAY reference at List::Util::unpairs() argument %d", i);
/* TODO: assert pair is an ARRAY ref */
pairav = (AV *)SvRV(pair);
EXTEND(SP, 2);
if(AvFILL(pairav) >= 0)
mPUSHs(newSVsv(AvARRAY(pairav)[0]));
else
PUSHs(&PL_sv_undef);
if(AvFILL(pairav) >= 1)
mPUSHs(newSVsv(AvARRAY(pairav)[1]));
else
PUSHs(&PL_sv_undef);
}
XSRETURN(items * 2);
}
void
pairkeys(...)
PROTOTYPE: @
PPCODE:
{
int argi = 0;
int reti = 0;
if(items % 2 && ckWARN(WARN_MISC))
warn("Odd number of elements in pairkeys");
{
for(; argi < items; argi += 2) {
SV *a = ST(argi);
ST(reti++) = sv_2mortal(newSVsv(a));
}
}
XSRETURN(reti);
}
void
pairvalues(...)
PROTOTYPE: @
PPCODE:
{
int argi = 0;
int reti = 0;
if(items % 2 && ckWARN(WARN_MISC))
warn("Odd number of elements in pairvalues");
{
for(; argi < items; argi += 2) {
SV *b = argi < items-1 ? ST(argi+1) : &PL_sv_undef;
ST(reti++) = sv_2mortal(newSVsv(b));
}
}
XSRETURN(reti);
}
void
pairfirst(block,...)
SV *block
PROTOTYPE: &@
PPCODE:
{
GV *agv,*bgv;
CV *cv = sv_to_cv(block, "pairfirst");
I32 ret_gimme = GIMME_V;
int argi = 1; /* "shift" the block */
if(!(items % 2) && ckWARN(WARN_MISC))
warn("Odd number of elements in pairfirst");
agv = gv_fetchpv("a", GV_ADD, SVt_PV);
bgv = gv_fetchpv("b", GV_ADD, SVt_PV);
SAVESPTR(GvSV(agv));
SAVESPTR(GvSV(bgv));
#ifdef dMULTICALL
assert(cv);
if(!CvISXSUB(cv)) {
/* Since MULTICALL is about to move it */
SV **stack = PL_stack_base + ax;
dMULTICALL;
I32 gimme = G_SCALAR;
UNUSED_VAR_newsp;
PUSH_MULTICALL(cv);
for(; argi < items; argi += 2) {
SV *a = GvSV(agv) = stack[argi];
SV *b = GvSV(bgv) = argi < items-1 ? stack[argi+1] : &PL_sv_undef;
MULTICALL;
if(!SvTRUEx(*PL_stack_sp))
continue;
POP_MULTICALL;
if(ret_gimme == G_LIST) {
ST(0) = sv_mortalcopy(a);
ST(1) = sv_mortalcopy(b);
XSRETURN(2);
}
else
XSRETURN_YES;
}
POP_MULTICALL;
XSRETURN(0);
}
else
#endif
{
for(; argi < items; argi += 2) {
dSP;
SV *a = GvSV(agv) = ST(argi);
SV *b = GvSV(bgv) = argi < items-1 ? ST(argi+1) : &PL_sv_undef;
PUSHMARK(SP);
call_sv((SV*)cv, G_SCALAR);
SPAGAIN;
if(!SvTRUEx(*PL_stack_sp))
continue;
if(ret_gimme == G_LIST) {