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/* Extracted from perl-5.004/universal.c, contributed by Graham Barr */
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static SV *
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isa_lookup(stash, name, len, level)
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HV *stash;
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char *name;
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int len;
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int level;
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{
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AV* av;
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GV* gv;
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GV** gvp;
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HV* hv = Nullhv;
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if (!stash)
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return &sv_undef;
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if(strEQ(HvNAME(stash), name))
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return &sv_yes;
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if (level > 100)
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croak("Recursive inheritance detected");
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gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
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if (gvp && (gv = *gvp) != (GV*)&sv_undef && (hv = GvHV(gv))) {
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SV* sv;
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SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
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if (svp && (sv = *svp) != (SV*)&sv_undef)
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return sv;
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}
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gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
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if (gvp && (gv = *gvp) != (GV*)&sv_undef && (av = GvAV(gv))) {
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if(!hv) {
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gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
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gv = *gvp;
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if (SvTYPE(gv) != SVt_PVGV)
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gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
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hv = GvHVn(gv);
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}
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if(hv) {
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SV** svp = AvARRAY(av);
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I32 items = AvFILL(av) + 1;
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while (items--) {
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SV* sv = *svp++;
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HV* basestash = gv_stashsv(sv, FALSE);
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if (!basestash) {
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if (dowarn)
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warn("Can't locate package %s for @%s::ISA",
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SvPVX(sv), HvNAME(stash));
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continue;
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}
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if(&sv_yes == isa_lookup(basestash, name, len, level + 1)) {
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(void)hv_store(hv,name,len,&sv_yes,0);
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return &sv_yes;
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}
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}
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(void)hv_store(hv,name,len,&sv_no,0);
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}
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}
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return &sv_no;
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}
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static bool
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sv_derived_from(sv, name)
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SV * sv ;
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char * name ;
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{
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SV *rv;
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char *type;
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HV *stash;
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stash = Nullhv;
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type = Nullch;
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if (SvGMAGICAL(sv))
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mg_get(sv) ;
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if (SvROK(sv)) {
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sv = SvRV(sv);
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type = sv_reftype(sv,0);
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if(SvOBJECT(sv))
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stash = SvSTASH(sv);
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}
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else {
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stash = gv_stashsv(sv, FALSE);
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}
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return (type && strEQ(type,name)) ||
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(stash && isa_lookup(stash, name, strlen(name), 0) == &sv_yes)
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? TRUE
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: FALSE ;
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}
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