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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 seperate 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)
{
dVAR;
const struct mro_meta *const meta = HvMROMETA(stash);
HV *const isa = meta->isa ? meta->isa : Perl_get_isa_hash(aTHX_ stash);
STRLEN len = strlen(name);
const HV *our_stash;
PERL_ARGS_ASSERT_ISA_LOOKUP;
if (hv_common(isa, NULL, name, len, 0 /* No "UTF-8" flag possible with only
a char * argument*/,
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 name in the stash itself, which is canonical. */
our_stash = gv_stashpvn(name, len, 0);
if (our_stash) {
HEK *const 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
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.
=cut
*/
bool
Perl_sv_derived_from(pTHX_ SV *sv, const char *const name)
{
dVAR;
HV *stash;
PERL_ARGS_ASSERT_SV_DERIVED_FROM;
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) : FALSE;
}
/*
=for apidoc sv_does
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(pTHX_ SV *sv, const char *const name)
{
const char *classname;
bool does_it;
SV *methodname;
dSP;
PERL_ARGS_ASSERT_SV_DOES;
ENTER;
SAVETMPS;
SvGETMAGIC(sv);
if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))
|| (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv))))
return FALSE;
if (sv_isobject(sv)) {
classname = sv_reftype(SvRV(sv),TRUE);
} else {
classname = SvPV_nolen(sv);
}
if (strEQ(name,classname))
return TRUE;
PUSHMARK(SP);
XPUSHs(sv);
mXPUSHs(newSVpv(name, 0));
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;
}
PERL_XS_EXPORT_C void XS_UNIVERSAL_isa(pTHX_ CV *cv);
PERL_XS_EXPORT_C void XS_UNIVERSAL_can(pTHX_ CV *cv);
PERL_XS_EXPORT_C void XS_UNIVERSAL_DOES(pTHX_ CV *cv);
PERL_XS_EXPORT_C void XS_UNIVERSAL_VERSION(pTHX_ CV *cv);
XS(XS_version_new);
XS(XS_version_stringify);
XS(XS_version_numify);
XS(XS_version_normal);
XS(XS_version_vcmp);
XS(XS_version_boolean);
#ifdef HASATTRIBUTE_NORETURN
XS(XS_version_noop) __attribute__noreturn__;
#else
XS(XS_version_noop);
#endif
XS(XS_version_is_alpha);
XS(XS_version_qv);
XS(XS_utf8_is_utf8);
XS(XS_utf8_valid);
XS(XS_utf8_encode);
XS(XS_utf8_decode);
XS(XS_utf8_upgrade);
XS(XS_utf8_downgrade);
XS(XS_utf8_unicode_to_native);
XS(XS_utf8_native_to_unicode);
XS(XS_Internals_SvREADONLY);
XS(XS_Internals_SvREFCNT);
XS(XS_Internals_hv_clear_placehold);
XS(XS_PerlIO_get_layers);
XS(XS_Regexp_DESTROY);
XS(XS_Internals_hash_seed);
XS(XS_Internals_rehash_seed);
XS(XS_Internals_HvREHASH);
XS(XS_Internals_inc_sub_generation);
XS(XS_re_is_regexp);
XS(XS_re_regname);
XS(XS_re_regnames);
XS(XS_re_regnames_count);
XS(XS_re_regexp_pattern);
XS(XS_Tie_Hash_NamedCapture_FETCH);
XS(XS_Tie_Hash_NamedCapture_STORE);
XS(XS_Tie_Hash_NamedCapture_DELETE);
XS(XS_Tie_Hash_NamedCapture_CLEAR);
XS(XS_Tie_Hash_NamedCapture_EXISTS);
XS(XS_Tie_Hash_NamedCapture_FIRSTK);
XS(XS_Tie_Hash_NamedCapture_NEXTK);
XS(XS_Tie_Hash_NamedCapture_SCALAR);
XS(XS_Tie_Hash_NamedCapture_flags);
void
Perl_boot_core_UNIVERSAL(pTHX)
{
dVAR;
static const char file[] = __FILE__;
newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
newXS("UNIVERSAL::DOES", XS_UNIVERSAL_DOES, file);
newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
{
/* register the overloading (type 'A') magic */
PL_amagic_generation++;
/* Make it findable via fetchmethod */
newXS("version::()", XS_version_noop, file);
newXS("version::new", XS_version_new, file);
newXS("version::(\"\"", XS_version_stringify, file);
newXS("version::stringify", XS_version_stringify, file);
newXS("version::(0+", XS_version_numify, file);
newXS("version::numify", XS_version_numify, file);
newXS("version::normal", XS_version_normal, file);
newXS("version::(cmp", XS_version_vcmp, file);
newXS("version::(<=>", XS_version_vcmp, file);
newXS("version::vcmp", XS_version_vcmp, file);
newXS("version::(bool", XS_version_boolean, file);
newXS("version::boolean", XS_version_boolean, file);
newXS("version::(nomethod", XS_version_noop, file);
newXS("version::noop", XS_version_noop, file);
newXS("version::is_alpha", XS_version_is_alpha, file);
newXS("version::qv", XS_version_qv, file);
}
newXS("utf8::is_utf8", XS_utf8_is_utf8, file);
newXS("utf8::valid", XS_utf8_valid, file);
newXS("utf8::encode", XS_utf8_encode, file);
newXS("utf8::decode", XS_utf8_decode, file);
newXS("utf8::upgrade", XS_utf8_upgrade, file);
newXS("utf8::downgrade", XS_utf8_downgrade, file);
newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file);
newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file);
newXSproto("Internals::SvREADONLY",XS_Internals_SvREADONLY, file, "\\[$%@];$");
newXSproto("Internals::SvREFCNT",XS_Internals_SvREFCNT, file, "\\[$%@];$");
newXSproto("Internals::hv_clear_placeholders",
XS_Internals_hv_clear_placehold, file, "\\%");
newXSproto("PerlIO::get_layers",
XS_PerlIO_get_layers, file, "*;@");
newXS("Regexp::DESTROY", XS_Regexp_DESTROY, file);
newXSproto("Internals::hash_seed",XS_Internals_hash_seed, file, "");
newXSproto("Internals::rehash_seed",XS_Internals_rehash_seed, file, "");
newXSproto("Internals::HvREHASH", XS_Internals_HvREHASH, file, "\\%");
newXSproto("re::is_regexp", XS_re_is_regexp, file, "$");
newXSproto("re::regname", XS_re_regname, file, ";$$");
newXSproto("re::regnames", XS_re_regnames, file, ";$");
newXSproto("re::regnames_count", XS_re_regnames_count, file, "");
newXSproto("re::regexp_pattern", XS_re_regexp_pattern, file, "$");
newXS("Tie::Hash::NamedCapture::FETCH", XS_Tie_Hash_NamedCapture_FETCH, file);
newXS("Tie::Hash::NamedCapture::STORE", XS_Tie_Hash_NamedCapture_STORE, file);
newXS("Tie::Hash::NamedCapture::DELETE", XS_Tie_Hash_NamedCapture_DELETE, file);
newXS("Tie::Hash::NamedCapture::CLEAR", XS_Tie_Hash_NamedCapture_CLEAR, file);
newXS("Tie::Hash::NamedCapture::EXISTS", XS_Tie_Hash_NamedCapture_EXISTS, file);
newXS("Tie::Hash::NamedCapture::FIRSTKEY", XS_Tie_Hash_NamedCapture_FIRSTK, file);
newXS("Tie::Hash::NamedCapture::NEXTKEY", XS_Tie_Hash_NamedCapture_NEXTK, file);
newXS("Tie::Hash::NamedCapture::SCALAR", XS_Tie_Hash_NamedCapture_SCALAR, file);
newXS("Tie::Hash::NamedCapture::flags", XS_Tie_Hash_NamedCapture_flags, file);
}
/*
=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 %s::%s(%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 char *const gvname = GvNAME(gv);
const HV *const stash = GvSTASH(gv);
const char *const hvname = stash ? HvNAME_get(stash) : NULL;
if (hvname)
Perl_croak(aTHX_ "Usage: %s::%s(%s)", hvname, gvname, params);
else
Perl_croak(aTHX_ "Usage: %s(%s)", gvname, 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);
const char *name;
SvGETMAGIC(sv);
if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))
|| (SvGMAGICAL(sv) && SvPOKp(sv) && SvCUR(sv))))
XSRETURN_UNDEF;
name = SvPV_nolen_const(ST(1));
ST(0) = boolSV(sv_derived_from(sv, name));
XSRETURN(1);
}
}
XS(XS_UNIVERSAL_can)
{
dVAR;
dXSARGS;
SV *sv;
const char *name;
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;
name = SvPV_nolen_const(ST(1));
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_autoload(pkg, name, FALSE);
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);
const char *name;
name = SvPV_nolen_const(ST(1));
if (sv_does( sv, name ))
XSRETURN_YES;
XSRETURN_NO;
}
}
XS(XS_UNIVERSAL_VERSION)
{
dVAR;
dXSARGS;
HV *pkg;
GV **gvp;
GV *gv;
SV *sv;
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)) {
SV * const nsv = sv_newmortal();
sv_setsv(nsv, sv);
sv = nsv;
if ( !sv_derived_from(sv, "version"))
upg_version(sv, FALSE);
undef = NULL;
}
else {
sv = &PL_sv_undef;
undef = "(undef)";
}
if (items > 1) {
SV *req = ST(1);
if (undef) {
if (pkg) {
const char * const name = HvNAME_get(pkg);
Perl_croak(aTHX_
"%s does not define $%s::VERSION--version check failed",
name, name);
} else {
Perl_croak(aTHX_
"%s defines neither package nor VERSION--version check failed",
SvPVx_nolen_const(ST(0)) );
}
}
if ( !sv_derived_from(req, "version")) {
/* 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_ "%s version %"SVf" required--"
"this is only version %"SVf"", HvNAME_get(pkg),
SVfARG(vnormal(req)),
SVfARG(vnormal(sv)));
} else {
Perl_croak(aTHX_ "%s version %"SVf" required--"
"this is only version %"SVf"", HvNAME_get(pkg),
SVfARG(vstringify(req)),
SVfARG(vstringify(sv)));
}
}
}
if ( SvOK(sv) && sv_derived_from(sv, "version") ) {
ST(0) = vstringify(sv);
} else {
ST(0) = sv;
}
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;
const char * const classname =
sv_isobject(ST(0)) /* get the class if called as an object method */
? HvNAME(SvSTASH(SvRV(ST(0))))
: (char *)SvPV_nolen(ST(0));
if ( items == 1 || vs == &PL_sv_undef ) { /* no param or explicit undef */
/* create empty object */
vs = sv_newmortal();
sv_setpvs(vs,"");
}
else if ( items == 3 ) {
vs = sv_newmortal();
Perl_sv_setpvf(aTHX_ vs,"v%s",SvPV_nolen_const(ST(2)));
}
rv = new_version(vs);
if ( strcmp(classname,"version") != 0 ) /* inherited new() */
sv_bless(rv, gv_stashpv(classname, GV_ADD));
mPUSHs(rv);
PUTBACK;
return;
}
}
XS(XS_version_stringify)
{
dVAR;
dXSARGS;
if (items < 1)
croak_xs_usage(cv, "lobj, ...");
SP -= items;
{
SV * lobj;
if (sv_derived_from(ST(0), "version")) {
lobj = SvRV(ST(0));
}
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;
if (sv_derived_from(ST(0), "version")) {
lobj = SvRV(ST(0));
}
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;
if (sv_derived_from(ST(0), "version")) {
lobj = SvRV(ST(0));
}
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;
if (sv_derived_from(ST(0), "version")) {
lobj = SvRV(ST(0));
}
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") )
{
robj = new_version(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")) {
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"))
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")) {
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;
if (items != 1)
croak_xs_usage(cv, "ver");
SP -= items;
{
SV * ver = ST(0);
if ( !SvVOK(ver) ) { /* only need to do with if not already v-string */
SV * const rv = sv_newmortal();
sv_setsv(rv,ver); /* make a duplicate */
upg_version(rv, TRUE);
PUSHs(rv);
}
else
{
mPUSHs(new_version(ver));
}
PUTBACK;
return;
}
}
XS(XS_utf8_is_utf8)
{
dVAR;
dXSARGS;
if (items != 1)
croak_xs_usage(cv, "sv");
else {
const SV * const sv = ST(0);
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);
const bool RETVAL = sv_utf8_decode(sv);
ST(0) = boolSV(RETVAL);
sv_2mortal(ST(0));
}
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);
sv_2mortal(ST(0));
}
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 sv = SvRV(ST(0));
PERL_UNUSED_ARG(cv);
if (items == 1) {
if (SvREADONLY(sv))
XSRETURN_YES;
else
XSRETURN_NO;
}
else if (items == 2) {
if (SvTRUE(ST(1))) {
SvREADONLY_on(sv);
XSRETURN_YES;
}
else {
/* I hope you really know what you are doing. */
SvREADONLY_off(sv);
XSRETURN_NO;
}
}
XSRETURN_UNDEF; /* Can't happen. */
}
XS(XS_Internals_SvREFCNT) /* This is dangerous stuff. */
{
dVAR;
dXSARGS;
SV * const sv = SvRV(ST(0));
PERL_UNUSED_ARG(cv);
if (items == 1)
XSRETURN_IV(SvREFCNT(sv) - 1); /* Minus the ref created for us. */
else if (items == 2) {
/* I hope you really know what you are doing. */
SvREFCNT(sv) = SvIV(ST(1));
XSRETURN_IV(SvREFCNT(sv));
}
XSRETURN_UNDEF; /* Can't happen. */
}
XS(XS_Internals_hv_clear_placehold)
{
dVAR;
dXSARGS;
if (items != 1)
croak_xs_usage(cv, "hv");
else {
HV * const hv = MUTABLE_HV(SvRV(ST(0)));
hv_clear_placeholders(hv);
XSRETURN(0);
}
}
XS(XS_Regexp_DESTROY)
{
PERL_UNUSED_CONTEXT;
PERL_UNUSED_ARG(cv);
}
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);
}
sv = POPs;
gv = MUTABLE_GV(sv);
if (!isGV(sv)) {
if (SvROK(sv) && isGV(SvRV(sv)))
gv = MUTABLE_GV(SvRV(sv));
else if (SvPOKp(sv))
gv = gv_fetchsv(sv, 0, SVt_PVIO);
}
if (gv && (io = GvIO(gv))) {
AV* const av = PerlIO_get_layers(aTHX_ input ?
IoIFP(io) : IoOFP(io));
I32 i;
const I32 last = av_len(av);
I32 nitem = 0;
for (i = last; i >= 0; i -= 3) {
SV * const * const namsvp = av_fetch(av, i - 2, FALSE);
SV * const * const argsvp = av_fetch(av, i - 1, FALSE);
SV * const * const flgsvp = av_fetch(av, i, FALSE);
const bool namok = namsvp && *namsvp && SvPOK(*namsvp);
const bool argok = argsvp && *argsvp && SvPOK(*argsvp);
const bool flgok = flgsvp && *flgsvp && SvIOK(*flgsvp);
if (details) {
/* Indents of 5? Yuck. */
/* We know that PerlIO_get_layers creates a new SV for
the name and flags, so we can just take a reference
and "steal" it when we free the AV below. */
XPUSHs(namok
? sv_2mortal(SvREFCNT_inc_simple_NN(*namsvp))
: &PL_sv_undef);
XPUSHs(argok
? newSVpvn_flags(SvPVX_const(*argsvp),
SvCUR(*argsvp),
(SvUTF8(*argsvp) ? SVf_UTF8 : 0)
| SVs_TEMP)
: &PL_sv_undef);
XPUSHs(namok
? sv_2mortal(SvREFCNT_inc_simple_NN(*flgsvp))
: &PL_sv_undef);
nitem += 3;
}
else {
if (namok && argok)
XPUSHs(sv_2mortal(Perl_newSVpvf(aTHX_ "%"SVf"(%"SVf")",