+#define DEBUG
+
+#ifdef DEBUG
+#define dbg_printf(fmt, args...) printf("[debug rcuja] " fmt, ## args)
+#else
+#define dbg_printf(fmt, args...) \
+do { \
+ /* do nothing but check printf format */ \
+ if (0) \
+ printf("[debug rcuja] " fmt, ## args); \
+} while (0)
+#endif
+