[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_ packWARN(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_Internals_SvREADONLY);
XS(XS_Internals_SvREFCNT);

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("Internals::SvREADONLY",XS_Internals_SvREADONLY, file, "\\[$%@];$");
    newXSproto("Internals::SvREFCNT",XS_Internals_SvREFCNT, 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) {
	     if (pkg)
		  Perl_croak(aTHX_
			     "%s does not define $%s::VERSION--version check failed",
			     HvNAME(pkg), HvNAME(pkg));
	     else {
		  char *str = SvPVx(ST(0), len);

		  Perl_croak(aTHX_
			     "%s defines neither package nor VERSION--version check failed", str);
	     }
	}
	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_Internals_SvREADONLY)	/* This is dangerous stuff. */
{
    dXSARGS;
    SV *sv = SvRV(ST(0));
    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. */
{
    dXSARGS;
    SV *sv = SvRV(ST(0));
    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. */
}
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))
9014280d	96	Perl_warner(aTHX_ packWARN(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);
29569577	170	XS(XS_Internals_SvREADONLY);
29569577	171	XS(XS_Internals_SvREFCNT);
0cb96387	172
	173	void
	174	Perl_boot_core_UNIVERSAL(pTHX)
	175	{
	176	char *file = __FILE__;
	177
	178	newXS("UNIVERSAL::isa", XS_UNIVERSAL_isa, file);
	179	newXS("UNIVERSAL::can", XS_UNIVERSAL_can, file);
	180	newXS("UNIVERSAL::VERSION", XS_UNIVERSAL_VERSION, file);
1b026014	181	newXS("utf8::valid", XS_utf8_valid, file);
	182	newXS("utf8::encode", XS_utf8_encode, file);
	183	newXS("utf8::decode", XS_utf8_decode, file);
	184	newXS("utf8::upgrade", XS_utf8_upgrade, file);
	185	newXS("utf8::downgrade", XS_utf8_downgrade, file);
	186	newXS("utf8::native_to_unicode", XS_utf8_native_to_unicode, file);
	187	newXS("utf8::unicode_to_native", XS_utf8_unicode_to_native, file);
29569577	188	newXSproto("Internals::SvREADONLY",XS_Internals_SvREADONLY, file, "\\[$%@];$");
29569577	189	newXSproto("Internals::SvREFCNT",XS_Internals_SvREFCNT, file, "\\[$%@];$");
0cb96387	190	}
0cb96387	191
55497cff	192
6d4a7be2	193	XS(XS_UNIVERSAL_isa)
	194	{
	195	dXSARGS;
55497cff	196	SV *sv;
55497cff	197	char *name;
2d8e6c8d	198	STRLEN n_a;
6d4a7be2	199
6d4a7be2	200	if (items != 2)
cea2e8a9	201	Perl_croak(aTHX_ "Usage: UNIVERSAL::isa(reference, kind)");
6d4a7be2	202
6d4a7be2	203	sv = ST(0);
f8f70380	204
d3f7f2b2	205	if (SvGMAGICAL(sv))
	206	mg_get(sv);
	207
aca069ec	208	if (!SvOK(sv) \|\| !(SvROK(sv) \|\| (SvPOK(sv) && SvCUR(sv))))
f8f70380	209	XSRETURN_UNDEF;
f8f70380	210
2d8e6c8d	211	name = (char *)SvPV(ST(1),n_a);
6d4a7be2	212
54310121	213	ST(0) = boolSV(sv_derived_from(sv, name));
6d4a7be2	214	XSRETURN(1);
	215	}
	216
6d4a7be2	217	XS(XS_UNIVERSAL_can)
	218	{
	219	dXSARGS;
	220	SV *sv;
	221	char *name;
	222	SV *rv;
6f08146e	223	HV *pkg = NULL;
2d8e6c8d	224	STRLEN n_a;
6d4a7be2	225
6d4a7be2	226	if (items != 2)
cea2e8a9	227	Perl_croak(aTHX_ "Usage: UNIVERSAL::can(object-ref, method)");
6d4a7be2	228
6d4a7be2	229	sv = ST(0);
f8f70380	230
d3f7f2b2	231	if (SvGMAGICAL(sv))
	232	mg_get(sv);
	233
aca069ec	234	if (!SvOK(sv) \|\| !(SvROK(sv) \|\| (SvPOK(sv) && SvCUR(sv))))
f8f70380	235	XSRETURN_UNDEF;
f8f70380	236
2d8e6c8d	237	name = (char *)SvPV(ST(1),n_a);
3280af22	238	rv = &PL_sv_undef;
6d4a7be2	239
46e4b22b	240	if (SvROK(sv)) {
6f08146e	241	sv = (SV*)SvRV(sv);
46e4b22b	242	if (SvOBJECT(sv))
6f08146e	243	pkg = SvSTASH(sv);
	244	}
	245	else {
	246	pkg = gv_stashsv(sv, FALSE);
	247	}
	248
	249	if (pkg) {
dc848c6f	250	GV *gv = gv_fetchmethod_autoload(pkg, name, FALSE);
	251	if (gv && isGV(gv))
	252	rv = sv_2mortal(newRV((SV*)GvCV(gv)));
6d4a7be2	253	}
	254
	255	ST(0) = rv;
	256	XSRETURN(1);
	257	}
	258
6d4a7be2	259	XS(XS_UNIVERSAL_VERSION)
	260	{
	261	dXSARGS;
	262	HV *pkg;
	263	GV **gvp;
	264	GV *gv;
	265	SV *sv;
	266	char *undef;
	267
1571675a	268	if (SvROK(ST(0))) {
6d4a7be2	269	sv = (SV*)SvRV(ST(0));
1571675a	270	if (!SvOBJECT(sv))
cea2e8a9	271	Perl_croak(aTHX_ "Cannot find version of an unblessed reference");
6d4a7be2	272	pkg = SvSTASH(sv);
	273	}
	274	else {
	275	pkg = gv_stashsv(ST(0), FALSE);
	276	}
	277
	278	gvp = pkg ? (GV)hv_fetch(pkg,"VERSION",7,FALSE) : Null(GV);
	279
d4bea2fb	280	if (gvp && isGV(gv = *gvp) && SvOK(sv = GvSV(gv))) {
6d4a7be2	281	SV *nsv = sv_newmortal();
	282	sv_setsv(nsv, sv);
	283	sv = nsv;
	284	undef = Nullch;
	285	}
	286	else {
3280af22	287	sv = (SV*)&PL_sv_undef;
6d4a7be2	288	undef = "(undef)";
	289	}
	290
1571675a	291	if (items > 1) {
	292	STRLEN len;
	293	SV *req = ST(1);
	294
62658f4d	295	if (undef) {
	296	if (pkg)
	297	Perl_croak(aTHX_
	298	"%s does not define $%s::VERSION--version check failed",
	299	HvNAME(pkg), HvNAME(pkg));
	300	else {
	301	char *str = SvPVx(ST(0), len);
	302
	303	Perl_croak(aTHX_
	304	"%s defines neither package nor VERSION--version check failed", str);
	305	}
	306	}
1571675a	307	if (!SvNIOK(sv) && SvPOK(sv)) {
	308	char *str = SvPVx(sv,len);
	309	while (len) {
	310	--len;
	311	/* XXX could DWIM "1.2.3" here */
	312	if (!isDIGIT(str[len]) && str[len] != '.' && str[len] != '_')
	313	break;
	314	}
	315	if (len) {
4305d8ab	316	if (SvNOK(req) && SvPOK(req)) {
1571675a	317	/* they said C<use Foo v1.2.3> and $Foo::VERSION
	318	* doesn't look like a float: do string compare */
	319	if (sv_cmp(req,sv) == 1) {
d2560b70	320	Perl_croak(aTHX_ "%s v%"VDf" required--"
d2560b70	321	"this is only v%"VDf,
1571675a	322	HvNAME(pkg), req, sv);
	323	}
	324	goto finish;
	325	}
	326	/* they said C<use Foo 1.002_003> and $Foo::VERSION
	327	* doesn't look like a float: force numeric compare */
155aba94	328	(void)SvUPGRADE(sv, SVt_PVNV);
1571675a	329	SvNVX(sv) = str_to_version(sv);
	330	SvPOK_off(sv);
	331	SvNOK_on(sv);
	332	}
	333	}
	334	/* if we get here, we're looking for a numeric comparison,
	335	* so force the required version into a float, even if they
	336	* said C<use Foo v1.2.3> */
4305d8ab	337	if (SvNOK(req) && SvPOK(req)) {
1571675a	338	NV n = SvNV(req);
	339	req = sv_newmortal();
	340	sv_setnv(req, n);
	341	}
	342
f6eb1a96	343	if (SvNV(req) > SvNV(sv))
1571675a	344	Perl_croak(aTHX_ "%s version %s required--this is only version %s",
f6eb1a96	345	HvNAME(pkg), SvPV_nolen(req), SvPV_nolen(sv));
2d8e6c8d	346	}
6d4a7be2	347
1571675a	348	finish:
6d4a7be2	349	ST(0) = sv;
	350
	351	XSRETURN(1);
	352	}
	353
1b026014	354	XS(XS_utf8_valid)
	355	{
	356	dXSARGS;
	357	if (items != 1)
	358	Perl_croak(aTHX_ "Usage: utf8::valid(sv)");
	359	{
	360	SV * sv = ST(0);
	361	{
	362	STRLEN len;
	363	char *s = SvPV(sv,len);
	364	if (!SvUTF8(sv) \|\| is_utf8_string((U8*)s,len))
	365	XSRETURN_YES;
	366	else
	367	XSRETURN_NO;
	368	}
	369	}
	370	XSRETURN_EMPTY;
	371	}
	372
	373	XS(XS_utf8_encode)
	374	{
	375	dXSARGS;
	376	if (items != 1)
	377	Perl_croak(aTHX_ "Usage: utf8::encode(sv)");
	378	{
	379	SV * sv = ST(0);
	380
	381	sv_utf8_encode(sv);
	382	}
	383	XSRETURN_EMPTY;
	384	}
	385
	386	XS(XS_utf8_decode)
	387	{
	388	dXSARGS;
	389	if (items != 1)
	390	Perl_croak(aTHX_ "Usage: utf8::decode(sv)");
	391	{
	392	SV * sv = ST(0);
	393	bool RETVAL;
	394
	395	RETVAL = sv_utf8_decode(sv);
	396	ST(0) = boolSV(RETVAL);
	397	sv_2mortal(ST(0));
	398	}
	399	XSRETURN(1);
	400	}
	401
	402	XS(XS_utf8_upgrade)
	403	{
	404	dXSARGS;
	405	if (items != 1)
	406	Perl_croak(aTHX_ "Usage: utf8::upgrade(sv)");
	407	{
	408	SV * sv = ST(0);
	409	STRLEN RETVAL;
	410	dXSTARG;
	411
	412	RETVAL = sv_utf8_upgrade(sv);
	413	XSprePUSH; PUSHi((IV)RETVAL);
	414	}
	415	XSRETURN(1);
	416	}
	417
418	XS(XS_utf8_downgrade)
419	{
420	dXSARGS;
421	if (items < 1 \|\| items > 2)
422	Perl_croak(aTHX_ "Usage: utf8::downgrade(sv, failok=0)");
423	{
424	SV * sv = ST(0);
425	bool failok;
426	bool RETVAL;
427
428	if (items < 2)
429	failok = 0;
430	else {
431	failok = (int)SvIV(ST(1));
432	}
433
434	RETVAL = sv_utf8_downgrade(sv, failok);
435	ST(0) = boolSV(RETVAL);
436	sv_2mortal(ST(0));
437	}
438	XSRETURN(1);
439	}
440
441	XS(XS_utf8_native_to_unicode)
442	{
443	dXSARGS;
444	UV uv = SvUV(ST(0));
b7953727	445
	446	if (items > 1)
	447	Perl_croak(aTHX_ "Usage: utf8::native_to_unicode(sv)");
	448
1b026014	449	ST(0) = sv_2mortal(newSViv(NATIVE_TO_UNI(uv)));
	450	XSRETURN(1);
	451	}
	452
	453	XS(XS_utf8_unicode_to_native)
	454	{
	455	dXSARGS;
	456	UV uv = SvUV(ST(0));
b7953727	457
	458	if (items > 1)
	459	Perl_croak(aTHX_ "Usage: utf8::unicode_to_native(sv)");
	460
1b026014	461	ST(0) = sv_2mortal(newSViv(UNI_TO_NATIVE(uv)));
	462	XSRETURN(1);
	463	}
	464
14a976d6	465	XS(XS_Internals_SvREADONLY) /* This is dangerous stuff. */
29569577	466	{
	467	dXSARGS;
	468	SV *sv = SvRV(ST(0));
	469	if (items == 1) {
	470	if (SvREADONLY(sv))
	471	XSRETURN_YES;
	472	else
	473	XSRETURN_NO;
	474	}
	475	else if (items == 2) {
	476	if (SvTRUE(ST(1))) {
	477	SvREADONLY_on(sv);
	478	XSRETURN_YES;
	479	}
	480	else {
14a976d6	481	/* I hope you really know what you are doing. */
29569577	482	SvREADONLY_off(sv);
	483	XSRETURN_NO;
	484	}
	485	}
14a976d6	486	XSRETURN_UNDEF; /* Can't happen. */
29569577	487	}
29569577	488
14a976d6	489	XS(XS_Internals_SvREFCNT) /* This is dangerous stuff. */
29569577	490	{
	491	dXSARGS;
	492	SV *sv = SvRV(ST(0));
	493	if (items == 1)
14a976d6	494	XSRETURN_IV(SvREFCNT(sv) - 1); /* Minus the ref created for us. */
29569577	495	else if (items == 2) {
14a976d6	496	/* I hope you really know what you are doing. */
29569577	497	SvREFCNT(sv) = SvIV(ST(1));
	498	XSRETURN_IV(SvREFCNT(sv));
	499	}
14a976d6	500	XSRETURN_UNDEF; /* Can't happen. */
29569577	501	}
29569577	502