Some minor performance improvements - most notably, don't search the

input state table if the next character matches the same state as before.

log.c

@@ -131,6 +131,9 @@ log_debug(const char *msg, ...)
 {
 	va_list	ap;
 
+	if (log_file == NULL)
+		return;
+
 	va_start(ap, msg);
 	log_vwrite(msg, ap);
 	va_end(ap);