Protocol: Implemented protocol error reporting.

Now public functions of the protocol can return an error code.

More work is done on actual logic.

Protocol code has bare-bones doxygen documentation.

Signed-off-by: Ramūnas Mažeikis <ramunasnezinomas@gmail.com>

2 files changed, 17 insertions, 22 deletions

diff --git a/include/protocol.h b/include/protocol.h
index 5872fa3..9d5b518 100644
--- a/include/protocol.h
+++ b/include/protocol.h
@@ -23,8 +23,8 @@
 
 #include <errno.h>
 
-#define	SUCCESS		(0)
-#define	TLV_OVERFLOW	(1 << 0)
+#define	E_TLV_OVERFLOW	(1 << 0)
+#define E_UNKNOWN_TYPE	(1 << 1)
 
 enum packet_type {
 	REGURAL,
@@ -33,27 +33,27 @@ enum packet_type {
 };
 
 enum tlv_type {
-	/* NULL-terminated string. */
+	/** NULL-terminated string. */
 	TEXT,
-	
-	/* Fixed point. 1 decimal digit of precision. */
+
+	/** Fixed point. 1 decimal digit of precision. */
 	FPI1,
-	
-	/* Literally time_t*/
+
+	/** Literally time_t*/
 	TIMESTAMP,
-	
-	/* Represents a request for lost message. Data is unsigned integer
-	 * that uniquely identifies the message. 
+
+	/** Represents a request for lost message. Data is unsigned integer
+	 * that uniquely identifies the message.
 	 */
 	REQUEST,
-	
-	/* Response to request. Begins with unsigned integer that represents
-	 * which message is begin repeated and the actual null-terminated
+
+	/** Response to request. Begins with unsigned integer that represents
+	 * which message is being repeated and the actual null-terminated
 	 * message after that.
 	 */
 	REPLY,
-	
-	/* UUID that represents a particular device.
+
+	/** UUID that represents a particular device.
 	 */
 	UUID
 };
@@ -88,7 +88,7 @@ void clear_data(void);
 /* Appends data to the next packet to be sent. Type of data is determined by
  * enum tlv_type.
  * */
-void push_data(char *data, enum tlv_type);
+int push_data(const char *data, enum tlv_type);
 
 /* Sends packet towards the other end.
  * */
diff --git a/include/utils.h b/include/utils.h
index daea864..e4feb9a 100644
--- a/include/utils.h
+++ b/include/utils.h
@@ -4,16 +4,11 @@
 #include <stdint.h>
 
 typedef struct uuid_s {
-    uint64_t low;
-    uint64_t hi;
+    char bytes[16];
 } uuid_t;
 
 int cmp_uuid(uuid_t *first, uuid_t *second);
 
-/* Prints uuid in cannonical format.
- */
-void uuid_to_str(uuid_t *to_print, char *buf);
-
 typedef int fpi1_t;
 
 fpi1_t add(fpi1_t a, fpi1_t b);