FIX: User variable names first 10 characters are now significant.

Also CID 39927 Unbounded source buffer, 39933 Copy into fixed size buffer.

exec.c

@@ -318,6 +318,9 @@ int nextarg(const char *prompt, char *buffer, int size, int terminator)
         return getstring(prompt, buffer, size, terminator);
 
 	tmpbuf = malloc( size) ;
+	if( tmpbuf == NULL)
+		return FALSE ;
+
     /* grab token and advance past */
 	gettoken( tmpbuf, size) ;