av.c apidoc

[perl5.git] / scope.c

diff --git a/scope.c b/scope.c
index 3b9f0d1..0544b89 100644 (file)
--- a/scope.c
+++ b/scope.c
@@ -249,7 +249,7 @@ Perl_save_svref(pTHX_ SV **sptr)
     return save_scalar_at(sptr);
 }
 
-/* Like save_svref(), but doesn't deal with magic.  Can be used to
+/* Like save_sptr(), but also SvREFCNT_dec()s the new value.  Can be used to
  * restore a global SV to its prior contents, freeing new value. */
 void
 Perl_save_generic_svref(pTHX_ SV **sptr)
@@ -261,6 +261,19 @@ Perl_save_generic_svref(pTHX_ SV **sptr)
     SSPUSHINT(SAVEt_GENERIC_SVREF);
 }
 
+/* Like save_pptr(), but also Safefree()s the new value if it is different
+ * from the old one.  Can be used to restore a global char* to its prior
+ * contents, freeing new value. */
+void
+Perl_save_generic_pvref(pTHX_ char **str)
+{
+    dTHR;
+    SSCHECK(3);
+    SSPUSHPTR(str);
+    SSPUSHPTR(*str);
+    SSPUSHINT(SAVEt_GENERIC_PVREF);
+}
+
 void
 Perl_save_gp(pTHX_ GV *gv, I32 empty)
 {
@@ -646,6 +659,7 @@ Perl_leave_scope(pTHX_ I32 base)
     register AV *av;
     register HV *hv;
     register void* ptr;
+    register char* str;
     I32 i;
 
     if (base < -1)
@@ -666,14 +680,20 @@ Perl_leave_scope(pTHX_ I32 base)
            ptr = &GvSV(gv);
            SvREFCNT_dec(gv);
            goto restore_sv;
+        case SAVEt_GENERIC_PVREF:              /* generic pv */
+           str = (char*)SSPOPPTR;
+           ptr = SSPOPPTR;
+           if (*(char**)ptr != str) {
+               Safefree(*(char**)ptr);
+               *(char**)ptr = str;
+           }
+           break;
         case SAVEt_GENERIC_SVREF:              /* generic sv */
            value = (SV*)SSPOPPTR;
            ptr = SSPOPPTR;
-           if (ptr) {
-               sv = *(SV**)ptr;
-               *(SV**)ptr = value;
-               SvREFCNT_dec(sv);
-           }
+           sv = *(SV**)ptr;
+           *(SV**)ptr = value;
+           SvREFCNT_dec(sv);
            SvREFCNT_dec(value);
            break;
         case SAVEt_SVREF:                      /* scalar reference */