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LexAlias.xs
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LexAlias.xs
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#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#ifndef PadARRAY
typedef AV PADNAMELIST;
typedef SV PADNAME;
# if PERL_VERSION < 8 || (PERL_VERSION == 8 && !PERL_SUBVERSION)
typedef AV PAD;
# endif
# define PadlistARRAY(pl) ((PAD **)AvARRAY(pl))
# define PadlistNAMES(pl) (*PadlistARRAY(pl))
# define PadnamelistARRAY(pnl) ((PADNAME **)AvARRAY(pnl))
# define PadnamelistMAX(pnl) AvFILLp(pnl)
# define PadARRAY AvARRAY
# define PadnamePV(pn) (SvPOKp(pn) ? SvPVX(pn) : NULL)
#endif
/* cargo-culted from PadWalker */
MODULE = Devel::LexAlias PACKAGE = Devel::LexAlias
void
_lexalias(SV* cv_ref, char *name, SV* new_rv)
CODE:
{
CV* cv = SvROK(cv_ref) ? (CV*) SvRV(cv_ref) : NULL;
PADNAMELIST* padn = cv ? PadlistNAMES(CvPADLIST(cv)) : PL_comppad_name;
PAD* padv = cv ? PadlistARRAY(CvPADLIST(cv))[1] : PL_comppad;
SV* new_sv;
I32 i;
if (!SvROK(new_rv)) croak("ref is not a reference");
new_sv = SvRV(new_rv);
for (i = 0; i <= PadnamelistMAX(padn); ++i) {
PADNAME* namesv = PadnamelistARRAY(padn)[i];
char* name_str;
if (namesv && (name_str = PadnamePV(namesv))) {
if (!strcmp(name, name_str)) {
SvREFCNT_dec(PadARRAY(padv)[i]);
PadARRAY(padv)[i] = new_sv;
SvREFCNT_inc(new_sv);
SvPADMY_on(new_sv);
}
}
}
}