[p5sagit/Sub-Name.git] / Name.xs

/* $Id: Name.xs,v 1.5 2004/08/18 13:21:44 xmath Exp $
 * Copyright (C) 2004  Matthijs van Duin.  All rights reserved.
 * This program is free software; you can redistribute it and/or modify 
 * it under the same terms as Perl itself.
 */

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

static MGVTBL subname_vtbl;

MODULE = Sub::Name  PACKAGE = Sub::Name

PROTOTYPES: DISABLE

void
subname(name, sub)
	char *name
	SV *sub
    PREINIT:
	CV *cv = NULL;
	GV *gv;
	HV *stash = CopSTASH(PL_curcop);
	char *s, *end = NULL, saved;
    PPCODE:
	if (!SvROK(sub) && SvGMAGICAL(sub))
		mg_get(sub);
	if (SvROK(sub))
		cv = (CV *) SvRV(sub);
	else if (SvTYPE(sub) == SVt_PVGV)
		cv = GvCVu(sub);
	else if (!SvOK(sub))
		croak(PL_no_usym, "a subroutine");
	else if (PL_op->op_private & HINT_STRICT_REFS)
		croak(PL_no_symref, SvPV_nolen(sub), "a subroutine");
	else if ((gv = gv_fetchpv(SvPV_nolen(sub), FALSE, SVt_PVCV)))
		cv = GvCVu(gv);
	if (!cv)
		croak("Undefined subroutine %s", SvPV_nolen(sub));
	if (SvTYPE(cv) != SVt_PVCV && SvTYPE(cv) != SVt_PVFM)
		croak("Not a subroutine reference");
	for (s = name; *s++; ) {
		if (*s == ':' && s[-1] == ':')
			end = ++s;
		else if (*s && s[-1] == '\'')
			end = s;
	}
	s--;
	if (end) {
		saved = *end;
		*end = 0;
		stash = GvHV(gv_fetchpv(name, TRUE, SVt_PVHV));
		*end = saved;
		name = end;
	}
	gv = (GV *) newSV(0);
	gv_init(gv, stash, name, s - name, TRUE);
#ifndef USE_5005THREADS
	if (CvPADLIST(cv)) {
		/* cheap way to refcount the gv */
		av_store((AV *) AvARRAY(CvPADLIST(cv))[0], 0, (SV *) gv);
	}
#endif
	else {
		/* expensive way to refcount the gv */
		MAGIC *mg = SvMAGIC(cv);
		while (mg && mg->mg_virtual != &subname_vtbl)
			mg = mg->mg_moremagic;
		if (!mg)
			mg = sv_magicext((SV *) cv, NULL, PERL_MAGIC_ext,
					&subname_vtbl, NULL, 0);
		if (mg->mg_flags & MGf_REFCOUNTED)
			SvREFCNT_dec(mg->mg_obj);
		mg->mg_flags |= MGf_REFCOUNTED;
		mg->mg_obj = (SV *) gv;
	}
	CvGV(cv) = gv;
	PUSHs(sub);
Commit	Line	Data
16c23894	1	/* $Id: Name.xs,v 1.5 2004/08/18 13:21:44 xmath Exp $
	2	* Copyright (C) 2004 Matthijs van Duin. All rights reserved.
	3	* This program is free software; you can redistribute it and/or modify
	4	* it under the same terms as Perl itself.
	5	*/
	6
	7	#include "EXTERN.h"
	8	#include "perl.h"
	9	#include "XSUB.h"
	10
bbd01306	11	static MGVTBL subname_vtbl;
16c23894	12
	13	MODULE = Sub::Name PACKAGE = Sub::Name
	14
	15	PROTOTYPES: DISABLE
	16
	17	void
	18	subname(name, sub)
	19	char *name
	20	SV *sub
	21	PREINIT:
	22	CV *cv = NULL;
	23	GV *gv;
	24	HV *stash = CopSTASH(PL_curcop);
	25	char s, end = NULL, saved;
	26	PPCODE:
	27	if (!SvROK(sub) && SvGMAGICAL(sub))
	28	mg_get(sub);
	29	if (SvROK(sub))
	30	cv = (CV *) SvRV(sub);
	31	else if (SvTYPE(sub) == SVt_PVGV)
	32	cv = GvCVu(sub);
	33	else if (!SvOK(sub))
	34	croak(PL_no_usym, "a subroutine");
	35	else if (PL_op->op_private & HINT_STRICT_REFS)
	36	croak(PL_no_symref, SvPV_nolen(sub), "a subroutine");
	37	else if ((gv = gv_fetchpv(SvPV_nolen(sub), FALSE, SVt_PVCV)))
	38	cv = GvCVu(gv);
	39	if (!cv)
	40	croak("Undefined subroutine %s", SvPV_nolen(sub));
	41	if (SvTYPE(cv) != SVt_PVCV && SvTYPE(cv) != SVt_PVFM)
	42	croak("Not a subroutine reference");
	43	for (s = name; *s++; ) {
	44	if (*s == ':' && s[-1] == ':')
	45	end = ++s;
	46	else if (*s && s[-1] == '\'')
	47	end = s;
	48	}
	49	s--;
	50	if (end) {
	51	saved = *end;
	52	*end = 0;
	53	stash = GvHV(gv_fetchpv(name, TRUE, SVt_PVHV));
	54	*end = saved;
	55	name = end;
	56	}
	57	gv = (GV *) newSV(0);
	58	gv_init(gv, stash, name, s - name, TRUE);
bbd01306	59	#ifndef USE_5005THREADS
	60	if (CvPADLIST(cv)) {
	61	/* cheap way to refcount the gv */
	62	av_store((AV ) AvARRAY(CvPADLIST(cv))[0], 0, (SV ) gv);
	63	}
	64	#endif
	65	else {
	66	/* expensive way to refcount the gv */
	67	MAGIC *mg = SvMAGIC(cv);
	68	while (mg && mg->mg_virtual != &subname_vtbl)
	69	mg = mg->mg_moremagic;
	70	if (!mg)
	71	mg = sv_magicext((SV *) cv, NULL, PERL_MAGIC_ext,
	72	&subname_vtbl, NULL, 0);
	73	if (mg->mg_flags & MGf_REFCOUNTED)
	74	SvREFCNT_dec(mg->mg_obj);
	75	mg->mg_flags \|= MGf_REFCOUNTED;
	76	mg->mg_obj = (SV *) gv;
	77	}
16c23894	78	CvGV(cv) = gv;
16c23894	79	PUSHs(sub);