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/* xsutils.c
*
* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
* by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*
*/
/*
* 'Perilous to us all are the devices of an art deeper than we possess
* ourselves.' --Gandalf
*
* [p.597 of _The Lord of the Rings_, III/xi: "The PalantÃr"]
*/
#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
/*
* Contributed by Spider Boardman (spider.boardman@orb.nashua.nh.us).
*/
static int
modify_SV_attributes(pTHX_ SV *sv, SV **retlist, SV **attrlist, int numattrs)
{
dVAR;
SV *attr;
int nret;
for (nret = 0 ; numattrs && (attr = *attrlist++); numattrs--) {
STRLEN len;
const char *name = SvPV_const(attr, len);
const bool negated = (*name == '-');
if (negated) {
name++;
len--;
}
switch (SvTYPE(sv)) {
case SVt_PVCV:
switch ((int)len) {
case 6:
switch (name[3]) {
case 'l':
if (memEQ(name, "lvalue", 6)) {
if (!CvISXSUB(MUTABLE_CV(sv))
&& CvROOT(MUTABLE_CV(sv))
&& !CvLVALUE(MUTABLE_CV(sv)) != negated)
break;
if (negated)
CvFLAGS(MUTABLE_CV(sv)) &= ~CVf_LVALUE;
else
CvFLAGS(MUTABLE_CV(sv)) |= CVf_LVALUE;
continue;
}
break;
case 'h':
if (memEQ(name, "method", 6)) {
if (negated)
CvFLAGS(MUTABLE_CV(sv)) &= ~CVf_METHOD;
else
CvFLAGS(MUTABLE_CV(sv)) |= CVf_METHOD;
continue;
}
break;
}
break;
}
break;
default:
if (memEQs(name, 6, "shared")) {
if (negated)
Perl_croak(aTHX_ "A variable may not be unshared");
SvSHARE(sv);
continue;
}
break;
}
/* anything recognized had a 'continue' above */
*retlist++ = attr;
nret++;
}
return nret;
}
MODULE = attributes PACKAGE = attributes
void
_modify_attrs(...)
PREINIT:
SV *rv, *sv;
PPCODE:
if (items < 1) {
usage:
croak_xs_usage(cv, "@attributes");
}
rv = ST(0);
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
if (items > 1)
XSRETURN(modify_SV_attributes(aTHX_ sv, &ST(0), &ST(1), items-1));
XSRETURN(0);
void
_fetch_attrs(...)
PROTOTYPE: $
PREINIT:
SV *rv, *sv;
cv_flags_t cvflags;
PPCODE:
if (items != 1) {
usage:
croak_xs_usage(cv, "$reference");
}
rv = ST(0);
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
switch (SvTYPE(sv)) {
case SVt_PVCV:
cvflags = CvFLAGS((const CV *)sv);
if (cvflags & CVf_LVALUE)
XPUSHs(newSVpvs_flags("lvalue", SVs_TEMP));
if (cvflags & CVf_METHOD)
XPUSHs(newSVpvs_flags("method", SVs_TEMP));
break;
default:
break;
}
PUTBACK;
void
_guess_stash(...)
PROTOTYPE: $
PREINIT:
SV *rv, *sv;
dXSTARG;
PPCODE:
if (items != 1) {
usage:
croak_xs_usage(cv, "$reference");
}
rv = ST(0);
ST(0) = TARG;
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
if (SvOBJECT(sv))
Perl_sv_sethek(aTHX_ TARG, HvNAME_HEK(SvSTASH(sv)));
#if 0 /* this was probably a bad idea */
else if (SvPADMY(sv))
sv_setsv(TARG, &PL_sv_no); /* unblessed lexical */
#endif
else {
const HV *stash = NULL;
switch (SvTYPE(sv)) {
case SVt_PVCV:
if (CvGV(sv) && isGV(CvGV(sv)) && GvSTASH(CvGV(sv)))
stash = GvSTASH(CvGV(sv));
else if (/* !CvANON(sv) && */ CvSTASH(sv))
stash = CvSTASH(sv);
break;
case SVt_PVGV:
if (isGV_with_GP(sv) && GvGP(sv) && GvESTASH(MUTABLE_GV(sv)))
stash = GvESTASH(MUTABLE_GV(sv));
break;
default:
break;
}
if (stash)
Perl_sv_sethek(aTHX_ TARG, HvNAME_HEK(stash));
}
SvSETMAGIC(TARG);
XSRETURN(1);
void
reftype(...)
PROTOTYPE: $
PREINIT:
SV *rv, *sv;
dXSTARG;
PPCODE:
if (items != 1) {
usage:
croak_xs_usage(cv, "$reference");
}
rv = ST(0);
ST(0) = TARG;
SvGETMAGIC(rv);
if (!(SvOK(rv) && SvROK(rv)))
goto usage;
sv = SvRV(rv);
sv_setpv(TARG, sv_reftype(sv, 0));
SvSETMAGIC(TARG);
XSRETURN(1);
/*
* Local variables:
* c-indentation-style: bsd
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*
* ex: set ts=8 sts=4 sw=4 noet:
*/
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