string library vs. gcc 2.7.2. Round 3. Fight!

widget/src/gtk/nsGtkMozRemoteHelper.cpp

@@ -249,10 +249,10 @@ nsGtkMozRemoteHelper::ParseCommand(const char *aCommand, char **aResponse)
   origString.Truncate(end_command);
   
   // get the action type
-  actionString = Substring(origString, (PRUint32)0, (PRUint32)begin_command);
-
-  commandString = Substring(origString, (PRUint32)(begin_command + 1), 
-			    (PRUint32)(origString.Length() - begin_command - 1));
+  actionString.Append(origString, begin_command);
+  if (origString.Length() > 0)
+    origString.Cut(0, begin_command + 1);
+  commandString.Append(origString);
 
   // convert the action to lower case and remove whitespace
   actionString.Trim(" ", PR_TRUE, PR_TRUE);