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universal.c
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universal.c
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/* universal.c
*
* Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
* 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* '"The roots of those mountains must be roots indeed; there must be
* great secrets buried there which have not been discovered since the
* beginning."' --Gandalf, relating Gollum's history
*
* [p.54 of _The Lord of the Rings_, I/ii: "The Shadow of the Past"]
*/
/* This file contains the code that implements the functions in Perl's
* UNIVERSAL package, such as UNIVERSAL->can().
*
* It is also used to store XS functions that need to be present in
* miniperl for a lack of a better place to put them. It might be
* clever to move them to separate XS files which would then be pulled
* in by some to-be-written build process.
*/
#include "EXTERN.h"
#define PERL_IN_UNIVERSAL_C
#include "perl.h"
#ifdef USE_PERLIO
#include "perliol.h" /* For the PERLIO_F_XXX */
#endif
/*
* Contributed by Graham Barr <Graham.Barr@tiuk.ti.com>
* The main guts of traverse_isa was actually copied from gv_fetchmeth
*/
STATIC bool
S_isa_lookup(pTHX_ HV *stash, const char * const name, STRLEN len, U32 flags)
{
dVAR;
const struct mro_meta *const meta = HvMROMETA(stash);
HV *isa = meta->isa;
const HV *our_stash;
PERL_ARGS_ASSERT_ISA_LOOKUP;
if (!isa) {
(void)mro_get_linear_isa(stash);
isa = meta->isa;
}
if (hv_common(isa, NULL, name, len, ( flags & SVf_UTF8 ? HVhek_UTF8 : 0),
HV_FETCH_ISEXISTS, NULL, 0)) {
/* Direct name lookup worked. */
return TRUE;
}
/* A stash/class can go by many names (ie. User == main::User), so
we use the HvENAME in the stash itself, which is canonical, falling
back to HvNAME if necessary. */
our_stash = gv_stashpvn(name, len, flags);
if (our_stash) {
HEK *canon_name = HvENAME_HEK(our_stash);
if (!canon_name) canon_name = HvNAME_HEK(our_stash);
if (hv_common(isa, NULL, HEK_KEY(canon_name), HEK_LEN(canon_name),
HEK_FLAGS(canon_name),
HV_FETCH_ISEXISTS, NULL, HEK_HASH(canon_name))) {
return TRUE;
}
}
return FALSE;
}
/*
=head1 SV Manipulation Functions
=for apidoc sv_derived_from_pvn
Returns a boolean indicating whether the SV is derived from the specified class
I<at the C level>. To check derivation at the Perl level, call C<isa()> as a
normal Perl method.
Currently, the only significant value for C<flags> is SVf_UTF8.
=cut
=for apidoc sv_derived_from_sv
Exactly like L</sv_derived_from_pvn>, but takes the name string in the form
of an SV instead of a string/length pair.
=cut
*/
bool
Perl_sv_derived_from_sv(pTHX_ SV *sv, SV *namesv, U32 flags)
{
char *namepv;
STRLEN namelen;
PERL_ARGS_ASSERT_SV_DERIVED_FROM_SV;
namepv = SvPV(namesv, namelen);
if (SvUTF8(namesv))
flags |= SVf_UTF8;
return sv_derived_from_pvn(sv, namepv, namelen, flags);
}
/*
=for apidoc sv_derived_from
Exactly like L</sv_derived_from_pv>, but doesn't take a C<flags> parameter.
=cut
*/
bool
Perl_sv_derived_from(pTHX_ SV *sv, const char *const name)
{
PERL_ARGS_ASSERT_SV_DERIVED_FROM;
return sv_derived_from_pvn(sv, name, strlen(name), 0);
}
/*
=for apidoc sv_derived_from_pv
Exactly like L</sv_derived_from_pvn>, but takes a nul-terminated string
instead of a string/length pair.
=cut
*/
bool
Perl_sv_derived_from_pv(pTHX_ SV *sv, const char *const name, U32 flags)
{
PERL_ARGS_ASSERT_SV_DERIVED_FROM_PV;
return sv_derived_from_pvn(sv, name, strlen(name), flags);
}
bool
Perl_sv_derived_from_pvn(pTHX_ SV *sv, const char *const name, const STRLEN len, U32 flags)
{
dVAR;
HV *stash;
PERL_ARGS_ASSERT_SV_DERIVED_FROM_PVN;
SvGETMAGIC(sv);
if (SvROK(sv)) {
const char *type;
sv = SvRV(sv);
type = sv_reftype(sv,0);
if (type && strEQ(type,name))
return TRUE;
stash = SvOBJECT(sv) ? SvSTASH(sv) : NULL;
}
else {
stash = gv_stashsv(sv, 0);
}
return stash ? isa_lookup(stash, name, len, flags) : FALSE;
}
/*
=for apidoc sv_does_sv
Returns a boolean indicating whether the SV performs a specific, named role.
The SV can be a Perl object or the name of a Perl class.
=cut
*/
#include "XSUB.h"
bool
Perl_sv_does_sv(pTHX_ SV *sv, SV *namesv, U32 flags)
{
SV *classname;
bool does_it;
SV *methodname;
dSP;
PERL_ARGS_ASSERT_SV_DOES_SV;
PERL_UNUSED_ARG(flags);
ENTER;
SAVETMPS;
SvGETMAGIC(sv);
if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))
|| (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv)))) {
LEAVE;
return FALSE;
}
if (sv_isobject(sv)) {
classname = sv_ref(NULL,SvRV(sv),TRUE);
} else {
classname = sv;
}
if (sv_eq(classname, namesv)) {
LEAVE;
return TRUE;
}
PUSHMARK(SP);
EXTEND(SP, 2);
PUSHs(sv);
PUSHs(namesv);
PUTBACK;
methodname = newSVpvs_flags("isa", SVs_TEMP);
/* ugly hack: use the SvSCREAM flag so S_method_common
* can figure out we're calling DOES() and not isa(),
* and report eventual errors correctly. --rgs */
SvSCREAM_on(methodname);
call_sv(methodname, G_SCALAR | G_METHOD);
SPAGAIN;
does_it = SvTRUE( TOPs );
FREETMPS;
LEAVE;
return does_it;
}
/*
=for apidoc sv_does
Like L</sv_does_pv>, but doesn't take a C<flags> parameter.
=cut
*/
bool
Perl_sv_does(pTHX_ SV *sv, const char *const name)
{
PERL_ARGS_ASSERT_SV_DOES;
return sv_does_sv(sv, newSVpvn_flags(name, strlen(name), SVs_TEMP), 0);
}
/*
=for apidoc sv_does_pv
Like L</sv_does_sv>, but takes a nul-terminated string instead of an SV.
=cut
*/
bool
Perl_sv_does_pv(pTHX_ SV *sv, const char *const name, U32 flags)
{
PERL_ARGS_ASSERT_SV_DOES_PV;
return sv_does_sv(sv, newSVpvn_flags(name, strlen(name), SVs_TEMP | flags), flags);
}
/*
=for apidoc sv_does_pvn
Like L</sv_does_sv>, but takes a string/length pair instead of an SV.
=cut
*/
bool
Perl_sv_does_pvn(pTHX_ SV *sv, const char *const name, const STRLEN len, U32 flags)
{
PERL_ARGS_ASSERT_SV_DOES_PVN;
return sv_does_sv(sv, newSVpvn_flags(name, len, flags | SVs_TEMP), flags);
}
/*
=for apidoc croak_xs_usage
A specialised variant of C<croak()> for emitting the usage message for xsubs
croak_xs_usage(cv, "eee_yow");
works out the package name and subroutine name from C<cv>, and then calls
C<croak()>. Hence if C<cv> is C<&ouch::awk>, it would call C<croak> as:
Perl_croak(aTHX_ "Usage: %"SVf"::%"SVf"(%s)", "ouch" "awk", "eee_yow");
=cut
*/
void
Perl_croak_xs_usage(pTHX_ const CV *const cv, const char *const params)
{
const GV *const gv = CvGV(cv);
PERL_ARGS_ASSERT_CROAK_XS_USAGE;
if (gv) {
const HV *const stash = GvSTASH(gv);
if (HvNAME_get(stash))
Perl_croak(aTHX_ "Usage: %"HEKf"::%"HEKf"(%s)",
HEKfARG(HvNAME_HEK(stash)),
HEKfARG(GvNAME_HEK(gv)),
params);
else
Perl_croak(aTHX_ "Usage: %"HEKf"(%s)",
HEKfARG(GvNAME_HEK(gv)), params);
} else {
/* Pants. I don't think that it should be possible to get here. */
Perl_croak(aTHX_ "Usage: CODE(0x%"UVxf")(%s)", PTR2UV(cv), params);
}
}
XS(XS_UNIVERSAL_isa)
{
dVAR;
dXSARGS;
if (items != 2)
croak_xs_usage(cv, "reference, kind");
else {
SV * const sv = ST(0);
SvGETMAGIC(sv);
if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))
|| (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv))))
XSRETURN_UNDEF;
ST(0) = boolSV(sv_derived_from_sv(sv, ST(1), 0));
XSRETURN(1);
}
}
XS(XS_UNIVERSAL_can)
{
dVAR;
dXSARGS;
SV *sv;
SV *rv;
HV *pkg = NULL;
if (items != 2)
croak_xs_usage(cv, "object-ref, method");
sv = ST(0);
SvGETMAGIC(sv);
if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))
|| (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv))))
XSRETURN_UNDEF;
rv = &PL_sv_undef;
if (SvROK(sv)) {
sv = MUTABLE_SV(SvRV(sv));
if (SvOBJECT(sv))
pkg = SvSTASH(sv);
}
else {
pkg = gv_stashsv(sv, 0);
}
if (pkg) {
GV * const gv = gv_fetchmethod_sv_flags(pkg, ST(1), 0);
if (gv && isGV(gv))
rv = sv_2mortal(newRV(MUTABLE_SV(GvCV(gv))));
}
ST(0) = rv;
XSRETURN(1);
}
XS(XS_UNIVERSAL_DOES)
{
dVAR;
dXSARGS;
PERL_UNUSED_ARG(cv);
if (items != 2)
Perl_croak(aTHX_ "Usage: invocant->DOES(kind)");
else {
SV * const sv = ST(0);
if (sv_does_sv( sv, ST(1), 0 ))
XSRETURN_YES;
XSRETURN_NO;
}
}
XS(XS_UNIVERSAL_VERSION)
{
dVAR;
dXSARGS;
HV *pkg;
GV **gvp;
GV *gv;
SV *sv;
SV *ret;
const char *undef;
PERL_UNUSED_ARG(cv);
if (SvROK(ST(0))) {
sv = MUTABLE_SV(SvRV(ST(0)));
if (!SvOBJECT(sv))
Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
pkg = SvSTASH(sv);
}
else {
pkg = gv_stashsv(ST(0), 0);
}
gvp = pkg ? (GV**)hv_fetchs(pkg, "VERSION", FALSE) : NULL;
if (gvp && isGV(gv = *gvp) && (sv = GvSV(gv)) && SvOK(sv)) {
ret = sv_newmortal();
sv_setsv(ret, sv);
undef = NULL;
}
else {
sv = ret = &PL_sv_undef;
undef = "(undef)";
}
if (items > 1) {
SV *req = ST(1);
if (undef) {
if (pkg) {
const HEK * const name = HvNAME_HEK(pkg);
Perl_croak(aTHX_
"%"HEKf" does not define $%"HEKf
"::VERSION--version check failed",
HEKfARG(name), HEKfARG(name));
} else {
Perl_croak(aTHX_
"%"SVf" defines neither package nor VERSION--version check failed",
SVfARG(ST(0)) );
}
}
if ( !sv_derived_from(sv, "version") || !SvROK(sv))
upg_version(sv, FALSE);
if ( !sv_derived_from(req, "version") || !SvROK(req)) {
/* req may very well be R/O, so create a new object */
req = sv_2mortal( new_version(req) );
}
if ( vcmp( req, sv ) > 0 ) {
if ( hv_exists(MUTABLE_HV(SvRV(req)), "qv", 2 ) ) {
Perl_croak(aTHX_ "%"HEKf" version %"SVf" required--"
"this is only version %"SVf"",
HEKfARG(HvNAME_HEK(pkg)),
SVfARG(sv_2mortal(vnormal(req))),
SVfARG(sv_2mortal(vnormal(sv))));
} else {
Perl_croak(aTHX_ "%"HEKf" version %"SVf" required--"
"this is only version %"SVf,
HEKfARG(HvNAME_HEK(pkg)),
SVfARG(sv_2mortal(vstringify(req))),
SVfARG(sv_2mortal(vstringify(sv))));
}
}
}
ST(0) = ret;
XSRETURN(1);
}
XS(XS_version_new)
{
dVAR;
dXSARGS;
if (items > 3)
croak_xs_usage(cv, "class, version");
SP -= items;
{
SV *vs = ST(1);
SV *rv;
STRLEN len;
const char *classname;
U32 flags;
if ( sv_isobject(ST(0)) ) { /* get the class if called as an object method */
const HV * stash = SvSTASH(SvRV(ST(0)));
classname = HvNAME(stash);
len = HvNAMELEN(stash);
flags = HvNAMEUTF8(stash) ? SVf_UTF8 : 0;
}
else {
classname = SvPV(ST(0), len);
flags = SvUTF8(ST(0));
}
if ( items == 1 || ! SvOK(vs) ) { /* no param or explicit undef */
/* create empty object */
vs = sv_newmortal();
sv_setpvs(vs, "0");
}
else if ( items == 3 ) {
vs = sv_newmortal();
Perl_sv_setpvf(aTHX_ vs,"v%s",SvPV_nolen_const(ST(2)));
}
rv = new_version(vs);
if ( strnNE(classname,"version", len) ) /* inherited new() */
sv_bless(rv, gv_stashpvn(classname, len, GV_ADD | flags));
mPUSHs(rv);
PUTBACK;
return;
}
}
XS(XS_version_stringify)
{
dVAR;
dXSARGS;
if (items < 1)
croak_xs_usage(cv, "lobj, ...");
SP -= items;
{
SV * lobj = ST(0);
if (sv_derived_from(lobj, "version") && SvROK(lobj)) {
lobj = SvRV(lobj);
}
else
Perl_croak(aTHX_ "lobj is not of type version");
mPUSHs(vstringify(lobj));
PUTBACK;
return;
}
}
XS(XS_version_numify)
{
dVAR;
dXSARGS;
if (items < 1)
croak_xs_usage(cv, "lobj, ...");
SP -= items;
{
SV * lobj = ST(0);
if (sv_derived_from(lobj, "version") && SvROK(lobj)) {
lobj = SvRV(lobj);
}
else
Perl_croak(aTHX_ "lobj is not of type version");
mPUSHs(vnumify(lobj));
PUTBACK;
return;
}
}
XS(XS_version_normal)
{
dVAR;
dXSARGS;
if (items < 1)
croak_xs_usage(cv, "lobj, ...");
SP -= items;
{
SV * lobj = ST(0);
if (sv_derived_from(lobj, "version") && SvROK(lobj)) {
lobj = SvRV(lobj);
}
else
Perl_croak(aTHX_ "lobj is not of type version");
mPUSHs(vnormal(lobj));
PUTBACK;
return;
}
}
XS(XS_version_vcmp)
{
dVAR;
dXSARGS;
if (items < 1)
croak_xs_usage(cv, "lobj, ...");
SP -= items;
{
SV * lobj = ST(0);
if (sv_derived_from(lobj, "version") && SvROK(lobj)) {
lobj = SvRV(lobj);
}
else
Perl_croak(aTHX_ "lobj is not of type version");
{
SV *rs;
SV *rvs;
SV * robj = ST(1);
const IV swap = (IV)SvIV(ST(2));
if ( ! sv_derived_from(robj, "version") || !SvROK(robj) )
{
robj = new_version(SvOK(robj) ? robj : newSVpvs_flags("0", SVs_TEMP));
sv_2mortal(robj);
}
rvs = SvRV(robj);
if ( swap )
{
rs = newSViv(vcmp(rvs,lobj));
}
else
{
rs = newSViv(vcmp(lobj,rvs));
}
mPUSHs(rs);
}
PUTBACK;
return;
}
}
XS(XS_version_boolean)
{
dVAR;
dXSARGS;
if (items < 1)
croak_xs_usage(cv, "lobj, ...");
SP -= items;
if (sv_derived_from(ST(0), "version") && SvROK(ST(0))) {
SV * const lobj = SvRV(ST(0));
SV * const rs = newSViv( vcmp(lobj,new_version(newSVpvs("0"))) );
mPUSHs(rs);
PUTBACK;
return;
}
else
Perl_croak(aTHX_ "lobj is not of type version");
}
XS(XS_version_noop)
{
dVAR;
dXSARGS;
if (items < 1)
croak_xs_usage(cv, "lobj, ...");
if (sv_derived_from(ST(0), "version") && SvROK(ST(0)))
Perl_croak(aTHX_ "operation not supported with version object");
else
Perl_croak(aTHX_ "lobj is not of type version");
#ifndef HASATTRIBUTE_NORETURN
XSRETURN_EMPTY;
#endif
}
XS(XS_version_is_alpha)
{
dVAR;
dXSARGS;
if (items != 1)
croak_xs_usage(cv, "lobj");
SP -= items;
if (sv_derived_from(ST(0), "version") && SvROK(ST(0))) {
SV * const lobj = ST(0);
if ( hv_exists(MUTABLE_HV(SvRV(lobj)), "alpha", 5 ) )
XSRETURN_YES;
else
XSRETURN_NO;
PUTBACK;
return;
}
else
Perl_croak(aTHX_ "lobj is not of type version");
}
XS(XS_version_qv)
{
dVAR;
dXSARGS;
PERL_UNUSED_ARG(cv);
SP -= items;
{
SV * ver = ST(0);
SV * rv;
STRLEN len = 0;
const char * classname = "";
U32 flags = 0;
if ( items == 2 && SvOK(ST(1)) ) {
ver = ST(1);
if ( sv_isobject(ST(0)) ) { /* class called as an object method */
const HV * stash = SvSTASH(SvRV(ST(0)));
classname = HvNAME(stash);
len = HvNAMELEN(stash);
flags = HvNAMEUTF8(stash) ? SVf_UTF8 : 0;
}
else {
classname = SvPV(ST(0), len);
flags = SvUTF8(ST(0));
}
}
if ( !SvVOK(ver) ) { /* not already a v-string */
rv = sv_newmortal();
sv_setsv(rv,ver); /* make a duplicate */
upg_version(rv, TRUE);
} else {
rv = sv_2mortal(new_version(ver));
}
if ( items == 2
&& strnNE(classname,"version", len) ) { /* inherited new() */
sv_bless(rv, gv_stashpvn(classname, len, GV_ADD | flags));
}
PUSHs(rv);
}
PUTBACK;
return;
}
XS(XS_version_is_qv)
{
dVAR;
dXSARGS;
if (items != 1)
croak_xs_usage(cv, "lobj");
SP -= items;
if (sv_derived_from(ST(0), "version") && SvROK(ST(0))) {
SV * const lobj = ST(0);
if ( hv_exists(MUTABLE_HV(SvRV(lobj)), "qv", 2 ) )
XSRETURN_YES;
else
XSRETURN_NO;
PUTBACK;
return;
}
else
Perl_croak(aTHX_ "lobj is not of type version");
}
XS(XS_utf8_is_utf8)
{
dVAR;
dXSARGS;
if (items != 1)
croak_xs_usage(cv, "sv");
else {
SV * const sv = ST(0);
SvGETMAGIC(sv);
if (SvUTF8(sv))
XSRETURN_YES;
else
XSRETURN_NO;
}
XSRETURN_EMPTY;
}
XS(XS_utf8_valid)
{
dVAR;
dXSARGS;
if (items != 1)
croak_xs_usage(cv, "sv");
else {
SV * const sv = ST(0);
STRLEN len;
const char * const s = SvPV_const(sv,len);
if (!SvUTF8(sv) || is_utf8_string((const U8*)s,len))
XSRETURN_YES;
else
XSRETURN_NO;
}
XSRETURN_EMPTY;
}
XS(XS_utf8_encode)
{
dVAR;
dXSARGS;
if (items != 1)
croak_xs_usage(cv, "sv");
sv_utf8_encode(ST(0));
XSRETURN_EMPTY;
}
XS(XS_utf8_decode)
{
dVAR;
dXSARGS;
if (items != 1)
croak_xs_usage(cv, "sv");
else {
SV * const sv = ST(0);
bool RETVAL;
if (SvIsCOW(sv)) sv_force_normal(sv);
RETVAL = sv_utf8_decode(sv);
ST(0) = boolSV(RETVAL);
}
XSRETURN(1);
}
XS(XS_utf8_upgrade)
{
dVAR;
dXSARGS;
if (items != 1)
croak_xs_usage(cv, "sv");
else {
SV * const sv = ST(0);
STRLEN RETVAL;
dXSTARG;
RETVAL = sv_utf8_upgrade(sv);
XSprePUSH; PUSHi((IV)RETVAL);
}
XSRETURN(1);
}
XS(XS_utf8_downgrade)
{
dVAR;
dXSARGS;
if (items < 1 || items > 2)
croak_xs_usage(cv, "sv, failok=0");
else {
SV * const sv = ST(0);
const bool failok = (items < 2) ? 0 : (int)SvIV(ST(1));
const bool RETVAL = sv_utf8_downgrade(sv, failok);
ST(0) = boolSV(RETVAL);
}
XSRETURN(1);
}
XS(XS_utf8_native_to_unicode)
{
dVAR;
dXSARGS;
const UV uv = SvUV(ST(0));
if (items > 1)
croak_xs_usage(cv, "sv");
ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv)));
XSRETURN(1);
}
XS(XS_utf8_unicode_to_native)
{
dVAR;
dXSARGS;
const UV uv = SvUV(ST(0));
if (items > 1)
croak_xs_usage(cv, "sv");
ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv)));
XSRETURN(1);
}
XS(XS_Internals_SvREADONLY) /* This is dangerous stuff. */
{
dVAR;
dXSARGS;
SV * const svz = ST(0);
SV * sv;
PERL_UNUSED_ARG(cv);
/* [perl #77776] - called as &foo() not foo() */
if (!SvROK(svz))
croak_xs_usage(cv, "SCALAR[, ON]");
sv = SvRV(svz);
if (items == 1) {
if (SvREADONLY(sv) && !SvIsCOW(sv))
XSRETURN_YES;
else
XSRETURN_NO;
}
else if (items == 2) {
if (SvTRUE(ST(1))) {
if (SvIsCOW(sv)) sv_force_normal(sv);
SvREADONLY_on(sv);
XSRETURN_YES;
}
else {
/* I hope you really know what you are doing. */
if (!SvIsCOW(sv)) SvREADONLY_off(sv);
XSRETURN_NO;
}
}
XSRETURN_UNDEF; /* Can't happen. */
}
XS(XS_Internals_SvREFCNT) /* This is dangerous stuff. */
{
dVAR;
dXSARGS;
SV * const svz = ST(0);
SV * sv;
PERL_UNUSED_ARG(cv);
/* [perl #77776] - called as &foo() not foo() */
if (!SvROK(svz))
croak_xs_usage(cv, "SCALAR[, REFCOUNT]");
sv = SvRV(svz);
if (items == 1)
XSRETURN_UV(SvREFCNT(sv) - 1); /* Minus the ref created for us. */
else if (items == 2) {
/* I hope you really know what you are doing. */
SvREFCNT(sv) = SvUV(ST(1)) + 1; /* we free one ref on exit */
XSRETURN_UV(SvREFCNT(sv) - 1);
}
XSRETURN_UNDEF; /* Can't happen. */
}
XS(XS_Internals_hv_clear_placehold)
{
dVAR;
dXSARGS;
if (items != 1 || !SvROK(ST(0)))
croak_xs_usage(cv, "hv");
else {
HV * const hv = MUTABLE_HV(SvRV(ST(0)));
hv_clear_placeholders(hv);
XSRETURN(0);
}
}
XS(XS_PerlIO_get_layers)
{
dVAR;
dXSARGS;
if (items < 1 || items % 2 == 0)
croak_xs_usage(cv, "filehandle[,args]");
#ifdef USE_PERLIO
{
SV * sv;
GV * gv;
IO * io;
bool input = TRUE;
bool details = FALSE;
if (items > 1) {
SV * const *svp;
for (svp = MARK + 2; svp <= SP; svp += 2) {
SV * const * const varp = svp;
SV * const * const valp = svp + 1;
STRLEN klen;
const char * const key = SvPV_const(*varp, klen);
switch (*key) {
case 'i':
if (klen == 5 && memEQ(key, "input", 5)) {
input = SvTRUE(*valp);
break;
}
goto fail;
case 'o':
if (klen == 6 && memEQ(key, "output", 6)) {
input = !SvTRUE(*valp);
break;
}
goto fail;
case 'd':
if (klen == 7 && memEQ(key, "details", 7)) {
details = SvTRUE(*valp);
break;
}
goto fail;
default:
fail:
Perl_croak(aTHX_
"get_layers: unknown argument '%s'",
key);
}
}
SP -= (items - 1);
}