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

#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, int len, int level)
{
    AV* av;
    GV* gv;
    GV** gvp;
    HV* hv = Nullhv;
    SV* subgen = Nullsv;

    if (!stash)
	return &PL_sv_undef;

    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, 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;

    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);
    }

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