[perl5.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.
 *
 */

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