re PR libstdc++/7961 (compare( char *) implemented incorrectly.)

2002-11-01  John Carter  <john.carter@tait.co.nz>

	PR libstdc++/7961
	* include/bits/basic_string.tcc
	(compare(const _CharT* __s)): Don't access __s past its length.

From-SVN: r58717

libstdc++-v3/ChangeLog

+2002-11-01  John Carter  <john.carter@tait.co.nz>
+
+	PR libstdc++/7961
+	* include/bits/basic_string.tcc
+	(compare(const _CharT* __s)): Don't access __s past its length.
+
 2002-10-31  Benjamin Kosnik  <bkoz@redhat.com>
 
 	PR libstdc++/8348

libstdc++-v3/include/bits/basic_string.tcc

@@ -884,9 +884,11 @@ namespace std
     compare(const _CharT* __s) const
     {
       size_type __size = this->size();
-      int __r = traits_type::compare(_M_data(), __s, __size);
+      size_type __osize = traits_type::length(__s);
+      size_type __len = min(__size, __osize);
+      int __r = traits_type::compare(_M_data(), __s, __len);
       if (!__r)
-	__r = __size - traits_type::length(__s);
+	__r = __size - __osize;
       return __r;
     }