[p5sagit/p5-mst-13.2.git] / universal.c

/*    universal.c
 *
 *    Copyright (c) 1997-2002, 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.
 *
 */

/*
 * "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 story
 */

#include "EXTERN.h"
#define PERL_IN_UNIVERSAL_C
#include "perl.h"

/*
 * Contributed by Graham Barr  <Graham.Barr@tiuk.ti.com>
 * The main guts of traverse_isa was actually copied from gv_fetchmeth
 */

STATIC SV *
S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash,
             int len, int level)
{
    AV* av;
    GV* gv;
    GV** gvp;
    HV* hv = Nullhv;
    SV* subgen = Nullsv;

    /* A stash/class can go by many names (ie. User == main::User), so 
       we compare the stash itself just in case */
    if (name_stash && (stash == name_stash))
        return &PL_sv_yes;

    if (strEQ(HvNAME(stash), name))
	return &PL_sv_yes;

    if (level > 100)
	Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
		   HvNAME(stash));

    gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);

    if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (subgen = GvSV(gv))
	&& (hv = GvHV(gv)))
    {
	if (SvIV(subgen) == PL_sub_generation) {
	    SV* sv;
	    SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
	    if (svp && (sv = *svp) != (SV*)&PL_sv_undef) {
	        DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n",
				  name, HvNAME(stash)) );
		return sv;
	    }
	}
	else {
	    DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n",
			      HvNAME(stash)) );
	    hv_clear(hv);
	    sv_setiv(subgen, PL_sub_generation);
	}
    }

    gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);

    if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
	if (!hv || !subgen) {
	    gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);

	    gv = *gvp;

	    if (SvTYPE(gv) != SVt_PVGV)
		gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);

	    if (!hv)
		hv = GvHVn(gv);
	    if (!subgen) {
		subgen = newSViv(PL_sub_generation);
		GvSV(gv) = subgen;
	    }
	}
	if (hv) {
	    SV** svp = AvARRAY(av);
	    /* NOTE: No support for tied ISA */
	    I32 items = AvFILLp(av) + 1;
	    while (items--) {
		SV* sv = *svp++;
		HV* basestash = gv_stashsv(sv, FALSE);
		if (!basestash) {
		    if (ckWARN(WARN_MISC))
			Perl_warner(aTHX_ WARN_SYNTAX,
		             "Can't locate package %s for @%s::ISA",
			    SvPVX(sv), HvNAME(stash));
		    continue;
		}
		if (&PL_sv_yes == isa_lookup(basestash, name, name_stash, 
                                             len, level + 1)) {
		    (void)hv_store(hv,name,len,&PL_sv_yes,0);
		    return &PL_sv_yes;
		}
	    }
	    (void)hv_store(hv,name,len,&PL_sv_no,0);
	}
    }

    return boolSV(strEQ(name, "UNIVERSAL"));
}

/*
=head1 SV Manipulation Functions

=for apidoc sv_derived_from

Returns a boolean indicating whether the SV is derived from the specified
class.  This is the function that implements C<UNIVERSAL::isa>.  It works
for class names as well as for objects.

=cut
*/

bool
Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
{
    char *type;
    HV *stash;
    HV *name_stash;

    stash = Nullhv;
    type = Nullch;

    if (SvGMAGICAL(sv))
        mg_get(sv) ;

    if (SvROK(sv)) {
        sv = SvRV(sv);
        type = sv_reftype(sv,0);
        if (SvOBJECT(sv))
            stash = SvSTASH(sv);
    }
    else {
        stash = gv_stashsv(sv, FALSE);
    }

    name_stash = gv_stashpv(name, FALSE);

    return (type && strEQ(type,name)) ||
            (stash && isa_lookup(stash, name, name_stash, strlen(name), 0) 
             == &PL_sv_yes)
        ? TRUE
        : FALSE ;
}

#include "XSUB.h"

void XS_UNIVERSAL_isa(pTHX_ CV *cv);
void XS_UNIVERSAL_can(pTHX_ CV *cv);
void XS_UNIVERSAL_VERSION(pTHX_ CV *cv);
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_access_readonly);

void
Perl_boot_core_UNIVERSAL(pTHX)
{
    char *file = __FILE__;

    newXS("UNIVERSAL::isa",             XS_UNIVERSAL_isa,         file);
    newXS("UNIVERSAL::can",             XS_UNIVERSAL_can,         file);
    newXS("UNIVERSAL::VERSION", 	XS_UNIVERSAL_VERSION, 	  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("access::readonly",XS_access_readonly, file, "\\[$%@];$");
}


XS(XS_UNIVERSAL_isa)
{
    dXSARGS;
    SV *sv;
    char *name;
    STRLEN n_a;

    if (items != 2)
	Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");

    sv = ST(0);

    if (SvGMAGICAL(sv))
	mg_get(sv);

    if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))))
	XSRETURN_UNDEF;

    name = (char *)SvPV(ST(1),n_a);

    ST(0) = boolSV(sv_derived_from(sv, name));
    XSRETURN(1);
}

XS(XS_UNIVERSAL_can)
{
    dXSARGS;
    SV   *sv;
    char *name;
    SV   *rv;
    HV   *pkg = NULL;
    STRLEN n_a;

    if (items != 2)
	Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");

    sv = ST(0);

    if (SvGMAGICAL(sv))
	mg_get(sv);

    if (!SvOK(sv) || !(SvROK(sv) || (SvPOK(sv) && SvCUR(sv))))
	XSRETURN_UNDEF;

    name = (char *)SvPV(ST(1),n_a);
    rv = &PL_sv_undef;

    if (SvROK(sv)) {
        sv = (SV*)SvRV(sv);
        if (SvOBJECT(sv))
            pkg = SvSTASH(sv);
    }
    else {
        pkg = gv_stashsv(sv, FALSE);
    }

    if (pkg) {
        GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
        if (gv && isGV(gv))
	    rv = sv_2mortal(newRV((SV*)GvCV(gv)));
    }

    ST(0) = rv;
    XSRETURN(1);
}

XS(XS_UNIVERSAL_VERSION)
{
    dXSARGS;
    HV *pkg;
    GV **gvp;
    GV *gv;
    SV *sv;
    char *undef;

    if (SvROK(ST(0))) {
        sv = (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), FALSE);
    }

    gvp = pkg ? (GV**)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV**);

    if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
        SV *nsv = sv_newmortal();
        sv_setsv(nsv, sv);
        sv = nsv;
        undef = Nullch;
    }
    else {
        sv = (SV*)&PL_sv_undef;
        undef = "(undef)";
    }

    if (items > 1) {
	STRLEN len;
	SV *req = ST(1);

	if (undef)
	    Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed",
		       HvNAME(pkg), HvNAME(pkg));

	if (!SvNIOK(sv) && SvPOK(sv)) {
	    char *str = SvPVx(sv,len);
	    while (len) {
		--len;
		/* XXX could DWIM "1.2.3" here */
		if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
		    break;
	    }
	    if (len) {
		if (SvNOK(req) && SvPOK(req)) {
		    /* they said C<use Foo v1.2.3> and $Foo::VERSION
		     * doesn't look like a float: do string compare */
		    if (sv_cmp(req,sv) == 1) {
			Perl_croak(aTHX_ "%s v%"VDf" required--"
				   "this is only v%"VDf,
				   HvNAME(pkg), req, sv);
		    }
		    goto finish;
		}
		/* they said C<use Foo 1.002_003> and $Foo::VERSION
		 * doesn't look like a float: force numeric compare */
		(void)SvUPGRADE(sv, SVt_PVNV);
		SvNVX(sv) = str_to_version(sv);
		SvPOK_off(sv);
		SvNOK_on(sv);
	    }
	}
	/* if we get here, we're looking for a numeric comparison,
	 * so force the required version into a float, even if they
	 * said C<use Foo v1.2.3> */
	if (SvNOK(req) && SvPOK(req)) {
	    NV n = SvNV(req);
	    req = sv_newmortal();
	    sv_setnv(req, n);
	}

	if (SvNV(req) > SvNV(sv))
	    Perl_croak(aTHX_ "%s version %s required--this is only version %s",
		       HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv));
    }

finish:
    ST(0) = sv;

    XSRETURN(1);
}

XS(XS_utf8_valid)
{
    dXSARGS;
    if (items != 1)
	Perl_croak(aTHX_ "Usage: utf8::valid(sv)");
    {
	SV *	sv = ST(0);
 {
  STRLEN len;
  char *s = SvPV(sv,len);
  if (!SvUTF8(sv) || is_utf8_string((U8*)s,len))
   XSRETURN_YES;
  else
   XSRETURN_NO;
 }
    }
    XSRETURN_EMPTY;
}

XS(XS_utf8_encode)
{
    dXSARGS;
    if (items != 1)
	Perl_croak(aTHX_ "Usage: utf8::encode(sv)");
    {
	SV *	sv = ST(0);

	sv_utf8_encode(sv);
    }
    XSRETURN_EMPTY;
}

XS(XS_utf8_decode)
{
    dXSARGS;
    if (items != 1)
	Perl_croak(aTHX_ "Usage: utf8::decode(sv)");
    {
	SV *	sv = ST(0);
	bool	RETVAL;

	RETVAL = sv_utf8_decode(sv);
	ST(0) = boolSV(RETVAL);
	sv_2mortal(ST(0));
    }
    XSRETURN(1);
}

XS(XS_utf8_upgrade)
{
    dXSARGS;
    if (items != 1)
	Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)");
    {
	SV *	sv = ST(0);
	STRLEN	RETVAL;
	dXSTARG;

	RETVAL = sv_utf8_upgrade(sv);
	XSprePUSH; PUSHi((IV)RETVAL);
    }
    XSRETURN(1);
}

XS(XS_utf8_downgrade)
{
    dXSARGS;
    if (items < 1 || items > 2)
	Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)");
    {
	SV *	sv = ST(0);
	bool	failok;
	bool	RETVAL;

	if (items < 2)
	    failok = 0;
	else {
	    failok = (int)SvIV(ST(1));
	}

	RETVAL = sv_utf8_downgrade(sv, failok);
	ST(0) = boolSV(RETVAL);
	sv_2mortal(ST(0));
    }
    XSRETURN(1);
}

XS(XS_utf8_native_to_unicode)
{
 dXSARGS;
 UV uv = SvUV(ST(0));

 if (items > 1)
     Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)");

 ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv)));
 XSRETURN(1);
}

XS(XS_utf8_unicode_to_native)
{
 dXSARGS;
 UV uv = SvUV(ST(0));

 if (items > 1)
     Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)");

 ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv)));
 XSRETURN(1);
}

XS(XS_access_readonly)
{
    dXSARGS;
    SV *sv = SvRV(ST(0));
    IV old = SvREADONLY(sv);
    if (items == 2) {
	if (SvTRUE(ST(1))) {
	    SvREADONLY_on(sv);
	}
	else {
	    SvREADONLY_off(sv);
	}
    }
    if (old)
	XSRETURN_YES;
    else
	XSRETURN_NO;
}
Commit	Line	Data
d6376244	1	/* universal.c
	2	*
	3	* Copyright (c) 1997-2002, Larry Wall
	4	*
	5	* You may distribute under the terms of either the GNU General Public
	6	* License or the Artistic License, as specified in the README file.
	7	*
	8	*/
	9
d31a8517	10	/*
	11	* "The roots of those mountains must be roots indeed; there must be
	12	* great secrets buried there which have not been discovered since the
	13	* beginning." --Gandalf, relating Gollum's story
	14	*/
	15
6d4a7be2	16	#include "EXTERN.h"
864dbfa3	17	#define PERL_IN_UNIVERSAL_C
6d4a7be2	18	#include "perl.h"
6d4a7be2	19
	20	/*
	21	* Contributed by Graham Barr <Graham.Barr@tiuk.ti.com>
	22	* The main guts of traverse_isa was actually copied from gv_fetchmeth
	23	*/
	24
76e3520e	25	STATIC SV *
301daebc	26	S_isa_lookup(pTHX_ HV stash, const char name, HV* name_stash,
301daebc	27	int len, int level)
6d4a7be2	28	{
	29	AV* av;
	30	GV* gv;
	31	GV** gvp;
	32	HV* hv = Nullhv;
46e4b22b	33	SV* subgen = Nullsv;
6d4a7be2	34
301daebc	35	/* A stash/class can go by many names (ie. User == main::User), so
	36	we compare the stash itself just in case */
	37	if (name_stash && (stash == name_stash))
	38	return &PL_sv_yes;
6d4a7be2	39
46e4b22b	40	if (strEQ(HvNAME(stash), name))
3280af22	41	return &PL_sv_yes;
6d4a7be2	42
6d4a7be2	43	if (level > 100)
46e4b22b	44	Perl_croak(aTHX_ "Recursive inheritance detected in package '%s'",
46e4b22b	45	HvNAME(stash));
6d4a7be2	46
	47	gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
	48
46e4b22b	49	if (gvp && (gv = gvp) != (GV)&PL_sv_undef && (subgen = GvSV(gv))
	50	&& (hv = GvHV(gv)))
	51	{
	52	if (SvIV(subgen) == PL_sub_generation) {
	53	SV* sv;
	54	SV svp = (SV)hv_fetch(hv, name, len, FALSE);
	55	if (svp && (sv = svp) != (SV)&PL_sv_undef) {
	56	DEBUG_o( Perl_deb(aTHX_ "Using cached ISA %s for package %s\n",
	57	name, HvNAME(stash)) );
	58	return sv;
	59	}
	60	}
	61	else {
	62	DEBUG_o( Perl_deb(aTHX_ "ISA Cache in package %s is stale\n",
	63	HvNAME(stash)) );
	64	hv_clear(hv);
	65	sv_setiv(subgen, PL_sub_generation);
	66	}
6d4a7be2	67	}
	68
	69	gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
46e4b22b	70
3280af22	71	if (gvp && (gv = gvp) != (GV)&PL_sv_undef && (av = GvAV(gv))) {
46e4b22b	72	if (!hv \|\| !subgen) {
6d4a7be2	73	gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
	74
	75	gv = *gvp;
	76
	77	if (SvTYPE(gv) != SVt_PVGV)
	78	gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
	79
46e4b22b	80	if (!hv)
	81	hv = GvHVn(gv);
	82	if (!subgen) {
	83	subgen = newSViv(PL_sub_generation);
	84	GvSV(gv) = subgen;
	85	}
6d4a7be2	86	}
46e4b22b	87	if (hv) {
6d4a7be2	88	SV** svp = AvARRAY(av);
93965878	89	/* NOTE: No support for tied ISA */
93965878	90	I32 items = AvFILLp(av) + 1;
6d4a7be2	91	while (items--) {
	92	SV* sv = *svp++;
	93	HV* basestash = gv_stashsv(sv, FALSE);
	94	if (!basestash) {
599cee73	95	if (ckWARN(WARN_MISC))
cea2e8a9	96	Perl_warner(aTHX_ WARN_SYNTAX,
599cee73	97	"Can't locate package %s for @%s::ISA",
6d4a7be2	98	SvPVX(sv), HvNAME(stash));
	99	continue;
	100	}
301daebc	101	if (&PL_sv_yes == isa_lookup(basestash, name, name_stash,
301daebc	102	len, level + 1)) {
3280af22	103	(void)hv_store(hv,name,len,&PL_sv_yes,0);
3280af22	104	return &PL_sv_yes;
6d4a7be2	105	}
6d4a7be2	106	}
3280af22	107	(void)hv_store(hv,name,len,&PL_sv_no,0);
6d4a7be2	108	}
	109	}
	110
e09f3e01	111	return boolSV(strEQ(name, "UNIVERSAL"));
6d4a7be2	112	}
6d4a7be2	113
954c1994	114	/*
ccfc67b7	115	=head1 SV Manipulation Functions
ccfc67b7	116
954c1994	117	=for apidoc sv_derived_from
	118
	119	Returns a boolean indicating whether the SV is derived from the specified
	120	class. This is the function that implements C<UNIVERSAL::isa>. It works
	121	for class names as well as for objects.
	122
	123	=cut
	124	*/
	125
55497cff	126	bool
864dbfa3	127	Perl_sv_derived_from(pTHX_ SV sv, const char name)
55497cff	128	{
55497cff	129	char *type;
55497cff	130	HV *stash;
301daebc	131	HV *name_stash;
46e4b22b	132
55497cff	133	stash = Nullhv;
55497cff	134	type = Nullch;
46e4b22b	135
55497cff	136	if (SvGMAGICAL(sv))
	137	mg_get(sv) ;
	138
	139	if (SvROK(sv)) {
	140	sv = SvRV(sv);
	141	type = sv_reftype(sv,0);
46e4b22b	142	if (SvOBJECT(sv))
55497cff	143	stash = SvSTASH(sv);
	144	}
	145	else {
	146	stash = gv_stashsv(sv, FALSE);
	147	}
46e4b22b	148
301daebc	149	name_stash = gv_stashpv(name, FALSE);
301daebc	150
55497cff	151	return (type && strEQ(type,name)) \|\|
301daebc	152	(stash && isa_lookup(stash, name, name_stash, strlen(name), 0)
301daebc	153	== &PL_sv_yes)
55497cff	154	? TRUE
55497cff	155	: FALSE ;
55497cff	156	}
55497cff	157
1b026014	158	#include "XSUB.h"
1b026014	159
acfe0abc	160	void XS_UNIVERSAL_isa(pTHX_ CV *cv);
	161	void XS_UNIVERSAL_can(pTHX_ CV *cv);
	162	void XS_UNIVERSAL_VERSION(pTHX_ CV *cv);
1b026014	163	XS(XS_utf8_valid);
	164	XS(XS_utf8_encode);
	165	XS(XS_utf8_decode);
	166	XS(XS_utf8_upgrade);
	167	XS(XS_utf8_downgrade);
	168	XS(XS_utf8_unicode_to_native);
	169	XS(XS_utf8_native_to_unicode);
1b1f1335	170	XS(XS_access_readonly);
0cb96387	171
	172	void
	173	Perl_boot_core_UNIVERSAL(pTHX)
	174	{
	175	char *file = __FILE__;
	176
	177	newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
	178	newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
	179	newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
1b026014	180	newXS("utf8::valid", XS_utf8_valid, file);
	181	newXS("utf8::encode", XS_utf8_encode, file);
	182	newXS("utf8::decode", XS_utf8_decode, file);
	183	newXS("utf8::upgrade", XS_utf8_upgrade, file);
	184	newXS("utf8::downgrade", XS_utf8_downgrade, file);
	185	newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file);
	186	newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file);
1b1f1335	187	newXSproto("access::readonly",XS_access_readonly, file, "\\[$%@];$");
0cb96387	188	}
0cb96387	189
55497cff	190
6d4a7be2	191	XS(XS_UNIVERSAL_isa)
	192	{
	193	dXSARGS;
55497cff	194	SV *sv;
55497cff	195	char *name;
2d8e6c8d	196	STRLEN n_a;
6d4a7be2	197
6d4a7be2	198	if (items != 2)
cea2e8a9	199	Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");
6d4a7be2	200
6d4a7be2	201	sv = ST(0);
f8f70380	202
d3f7f2b2	203	if (SvGMAGICAL(sv))
	204	mg_get(sv);
	205
aca069ec	206	if (!SvOK(sv) \|\| !(SvROK(sv) \|\| (SvPOK(sv) && SvCUR(sv))))
f8f70380	207	XSRETURN_UNDEF;
f8f70380	208
2d8e6c8d	209	name = (char *)SvPV(ST(1),n_a);
6d4a7be2	210
54310121	211	ST(0) = boolSV(sv_derived_from(sv, name));
6d4a7be2	212	XSRETURN(1);
	213	}
	214
6d4a7be2	215	XS(XS_UNIVERSAL_can)
	216	{
	217	dXSARGS;
	218	SV *sv;
	219	char *name;
	220	SV *rv;
6f08146e	221	HV *pkg = NULL;
2d8e6c8d	222	STRLEN n_a;
6d4a7be2	223
6d4a7be2	224	if (items != 2)
cea2e8a9	225	Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");
6d4a7be2	226
6d4a7be2	227	sv = ST(0);
f8f70380	228
d3f7f2b2	229	if (SvGMAGICAL(sv))
	230	mg_get(sv);
	231
aca069ec	232	if (!SvOK(sv) \|\| !(SvROK(sv) \|\| (SvPOK(sv) && SvCUR(sv))))
f8f70380	233	XSRETURN_UNDEF;
f8f70380	234
2d8e6c8d	235	name = (char *)SvPV(ST(1),n_a);
3280af22	236	rv = &PL_sv_undef;
6d4a7be2	237
46e4b22b	238	if (SvROK(sv)) {
6f08146e	239	sv = (SV*)SvRV(sv);
46e4b22b	240	if (SvOBJECT(sv))
6f08146e	241	pkg = SvSTASH(sv);
	242	}
	243	else {
	244	pkg = gv_stashsv(sv, FALSE);
	245	}
	246
	247	if (pkg) {
dc848c6f	248	GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
	249	if (gv && isGV(gv))
	250	rv = sv_2mortal(newRV((SV*)GvCV(gv)));
6d4a7be2	251	}
	252
	253	ST(0) = rv;
	254	XSRETURN(1);
	255	}
	256
6d4a7be2	257	XS(XS_UNIVERSAL_VERSION)
	258	{
	259	dXSARGS;
	260	HV *pkg;
	261	GV **gvp;
	262	GV *gv;
	263	SV *sv;
	264	char *undef;
	265
1571675a	266	if (SvROK(ST(0))) {
6d4a7be2	267	sv = (SV*)SvRV(ST(0));
1571675a	268	if (!SvOBJECT(sv))
cea2e8a9	269	Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
6d4a7be2	270	pkg = SvSTASH(sv);
	271	}
	272	else {
	273	pkg = gv_stashsv(ST(0), FALSE);
	274	}
	275
	276	gvp = pkg ? (GV)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV);
	277
d4bea2fb	278	if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
6d4a7be2	279	SV *nsv = sv_newmortal();
	280	sv_setsv(nsv, sv);
	281	sv = nsv;
	282	undef = Nullch;
	283	}
	284	else {
3280af22	285	sv = (SV*)&PL_sv_undef;
6d4a7be2	286	undef = "(undef)";
	287	}
	288
1571675a	289	if (items > 1) {
	290	STRLEN len;
	291	SV *req = ST(1);
	292
	293	if (undef)
	294	Perl_croak(aTHX_ "%s does not define $%s::VERSION--version check failed",
	295	HvNAME(pkg), HvNAME(pkg));
	296
	297	if (!SvNIOK(sv) && SvPOK(sv)) {
	298	char *str = SvPVx(sv,len);
	299	while (len) {
	300	--len;
	301	/* XXX could DWIM "1.2.3" here */
	302	if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
	303	break;
	304	}
	305	if (len) {
4305d8ab	306	if (SvNOK(req) && SvPOK(req)) {
1571675a	307	/* they said C<use Foo v1.2.3> and $Foo::VERSION
	308	* doesn't look like a float: do string compare */
	309	if (sv_cmp(req,sv) == 1) {
d2560b70	310	Perl_croak(aTHX_ "%s v%"VDf" required--"
d2560b70	311	"this is only v%"VDf,
1571675a	312	HvNAME(pkg), req, sv);
	313	}
	314	goto finish;
	315	}
	316	/* they said C<use Foo 1.002_003> and $Foo::VERSION
	317	* doesn't look like a float: force numeric compare */
155aba94	318	(void)SvUPGRADE(sv, SVt_PVNV);
1571675a	319	SvNVX(sv) = str_to_version(sv);
	320	SvPOK_off(sv);
	321	SvNOK_on(sv);
	322	}
	323	}
	324	/* if we get here, we're looking for a numeric comparison,
	325	* so force the required version into a float, even if they
	326	* said C<use Foo v1.2.3> */
4305d8ab	327	if (SvNOK(req) && SvPOK(req)) {
1571675a	328	NV n = SvNV(req);
	329	req = sv_newmortal();
	330	sv_setnv(req, n);
	331	}
	332
f6eb1a96	333	if (SvNV(req) > SvNV(sv))
1571675a	334	Perl_croak(aTHX_ "%s version %s required--this is only version %s",
f6eb1a96	335	HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv));
2d8e6c8d	336	}
6d4a7be2	337
1571675a	338	finish:
6d4a7be2	339	ST(0) = sv;
	340
	341	XSRETURN(1);
	342	}
	343
1b026014	344	XS(XS_utf8_valid)
	345	{
	346	dXSARGS;
	347	if (items != 1)
	348	Perl_croak(aTHX_ "Usage: utf8::valid(sv)");
	349	{
	350	SV * sv = ST(0);
	351	{
	352	STRLEN len;
	353	char *s = SvPV(sv,len);
	354	if (!SvUTF8(sv) \|\| is_utf8_string((U8*)s,len))
	355	XSRETURN_YES;
	356	else
	357	XSRETURN_NO;
	358	}
	359	}
	360	XSRETURN_EMPTY;
	361	}
	362
	363	XS(XS_utf8_encode)
	364	{
	365	dXSARGS;
	366	if (items != 1)
	367	Perl_croak(aTHX_ "Usage: utf8::encode(sv)");
	368	{
	369	SV * sv = ST(0);
	370
	371	sv_utf8_encode(sv);
	372	}
	373	XSRETURN_EMPTY;
	374	}
	375
	376	XS(XS_utf8_decode)
	377	{
	378	dXSARGS;
	379	if (items != 1)
	380	Perl_croak(aTHX_ "Usage: utf8::decode(sv)");
	381	{
	382	SV * sv = ST(0);
	383	bool RETVAL;
	384
	385	RETVAL = sv_utf8_decode(sv);
	386	ST(0) = boolSV(RETVAL);
	387	sv_2mortal(ST(0));
	388	}
	389	XSRETURN(1);
	390	}
	391
	392	XS(XS_utf8_upgrade)
	393	{
	394	dXSARGS;
	395	if (items != 1)
	396	Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)");
	397	{
	398	SV * sv = ST(0);
	399	STRLEN RETVAL;
	400	dXSTARG;
	401
	402	RETVAL = sv_utf8_upgrade(sv);
	403	XSprePUSH; PUSHi((IV)RETVAL);
	404	}
	405	XSRETURN(1);
	406	}
	407
408	XS(XS_utf8_downgrade)
409	{
410	dXSARGS;
411	if (items < 1 \|\| items > 2)
412	Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)");
413	{
414	SV * sv = ST(0);
415	bool failok;
416	bool RETVAL;
417
418	if (items < 2)
419	failok = 0;
420	else {
421	failok = (int)SvIV(ST(1));
422	}
423
424	RETVAL = sv_utf8_downgrade(sv, failok);
425	ST(0) = boolSV(RETVAL);
426	sv_2mortal(ST(0));
427	}
428	XSRETURN(1);
429	}
430
431	XS(XS_utf8_native_to_unicode)
432	{
433	dXSARGS;
434	UV uv = SvUV(ST(0));
b7953727	435
	436	if (items > 1)
	437	Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)");
	438
1b026014	439	ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv)));
	440	XSRETURN(1);
	441	}
	442
	443	XS(XS_utf8_unicode_to_native)
	444	{
	445	dXSARGS;
	446	UV uv = SvUV(ST(0));
b7953727	447
	448	if (items > 1)
	449	Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)");
	450
1b026014	451	ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv)));
	452	XSRETURN(1);
	453	}
	454
1b1f1335	455	XS(XS_access_readonly)
	456	{
	457	dXSARGS;
	458	SV *sv = SvRV(ST(0));
	459	IV old = SvREADONLY(sv);
	460	if (items == 2) {
	461	if (SvTRUE(ST(1))) {
	462	SvREADONLY_on(sv);
	463	}
	464	else {
	465	SvREADONLY_off(sv);
	466	}
	467	}
	468	if (old)
	469	XSRETURN_YES;
	470	else
	471	XSRETURN_NO;
	472	}
1b026014	473