EBCDIC: the non-printable characters are different.

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

diff --git a/universal.c b/universal.c
index 868fe55..b2313f5 100644 (file)
--- a/universal.c
+++ b/universal.c
@@ -1,3 +1,12 @@
+/*    universal.c
+ *
+ *    Copyright (c) 1997-2002, Larry Wall
+ *
+ *    You may distribute under the terms of either the GNU General Public
+ *    License or the Artistic License, as specified in the README file.
+ *
+ */
+
 #include "EXTERN.h"
 #define PERL_IN_UNIVERSAL_C
 #include "perl.h"
@@ -8,7 +17,8 @@
  */
 
 STATIC SV *
-S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level)
+S_isa_lookup(pTHX_ HV *stash, const char *name, HV* name_stash,
+             int len, int level)
 {
     AV* av;
     GV* gv;
@@ -16,8 +26,10 @@ S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level)
     HV* hv = Nullhv;
     SV* subgen = Nullsv;
 
-    if (!stash)
-       return &PL_sv_undef;
+    /* A stash/class can go by many names (ie. User == main::User), so 
+       we compare the stash itself just in case */
+    if (name_stash && (stash == name_stash))
+        return &PL_sv_yes;
 
     if (strEQ(HvNAME(stash), name))
        return &PL_sv_yes;
@@ -80,7 +92,8 @@ S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level)
                            SvPVX(sv), HvNAME(stash));
                    continue;
                }
-               if (&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) {
+               if (&PL_sv_yes == isa_lookup(basestash, name, name_stash, 
+                                             len, level + 1)) {
                    (void)hv_store(hv,name,len,&PL_sv_yes,0);
                    return &PL_sv_yes;
                }
@@ -93,6 +106,8 @@ S_isa_lookup(pTHX_ HV *stash, const char *name, int len, int level)
 }
 
 /*
+=head1 SV Manipulation Functions
+
 =for apidoc sv_derived_from
 
 Returns a boolean indicating whether the SV is derived from the specified
@@ -107,6 +122,7 @@ Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
 {
     char *type;
     HV *stash;
+    HV *name_stash;
 
     stash = Nullhv;
     type = Nullch;
@@ -124,8 +140,11 @@ Perl_sv_derived_from(pTHX_ SV *sv, const char *name)
         stash = gv_stashsv(sv, FALSE);
     }
 
+    name_stash = gv_stashpv(name, FALSE);
+
     return (type && strEQ(type,name)) ||
-            (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes)
+            (stash && isa_lookup(stash, name, name_stash, strlen(name), 0) 
+             == &PL_sv_yes)
         ? TRUE
         : FALSE ;
 }