-static int data(struct sr_output *o, const char *data_in, uint64_t length_in,
- char **data_out, uint64_t *length_out)
+/* Message logging helpers with driver-specific prefix string. */
+#define DRIVER_LOG_DOMAIN "output/binary: "
+#define sr_log(l, s, args...) sr_log(l, DRIVER_LOG_DOMAIN s, ## args)
+#define sr_spew(s, args...) sr_spew(DRIVER_LOG_DOMAIN s, ## args)
+#define sr_dbg(s, args...) sr_dbg(DRIVER_LOG_DOMAIN s, ## args)
+#define sr_info(s, args...) sr_info(DRIVER_LOG_DOMAIN s, ## args)
+#define sr_warn(s, args...) sr_warn(DRIVER_LOG_DOMAIN s, ## args)
+#define sr_err(s, args...) sr_err(DRIVER_LOG_DOMAIN s, ## args)
+
+static int data(struct sr_output *o, const uint8_t *data_in,
+ uint64_t length_in, uint8_t **data_out, uint64_t *length_out)