Clean up buf silliness.

common.h

@@ -2,14 +2,23 @@
 #include <unistd.h>
 
 
+//////// buf
+
 #define BUF_LEN 4096
 struct buf {
-	char *buf;
-	char *tmp;
+	char buf[BUF_LEN];
 	size_t start;
 	size_t length;
 };
 
+#define buf_chr(buff, at) ((buff)->buf[(buff)->start + (at)])
+#define buf_at(buff, at) (&buf_chr(buff, at))
+
+ssize_t buf_fill(struct buf *, int);
+void buf_consume(struct buf *, size_t);
+
+
+//////// packet
 
 #define MLAT_HZ 60000000
 #define DATA_MAX 14
@@ -25,10 +34,4 @@ struct packet {
 };
 
 
-#define buf_at(buff, at) (&(buff)->buf[(buff)->start + (at)])
-
-void buf_init(struct buf *, char *, char *);
-void buf_alias(struct buf *, struct buf *);
-
-ssize_t buf_fill(struct buf *, int);
-void buf_consume(struct buf *, size_t);
+//////// hex