75 #define fifo_free_first_bytes(cur, used, len)  ((((cur)+(used)) <= (len)) \  argument
76 						  ? (len)-((cur)+(used)) : 0)
77 #define fifo_free_last_bytes(cur, used, len)   ((((cur)+(used)) <= (len)) \  argument
78 						  ? (cur) : (len)-(used))
80 #define fifo_used_first_bytes(cur, used, len)  ((((cur)+(used)) <= (len)) \  argument
81 						  ? (used) : (len)-(cur))
82 #define fifo_used_last_bytes(cur, used, len)   ((((cur)+(used)) <= (len)) \  argument
83 						  ? 0 : ((used)+(cur))-(len))
85 #define fifo_free_first_offset(cur, used)      ((cur)+(used))  argument
86 #define fifo_free_last_offset(cur, used, len)  \  argument
87 					   fifo_used_last_bytes(cur, used, len)
89 #define fifo_used_first_offset(cur)            (cur)  argument
90 #define fifo_used_last_offset(cur)             (0)  argument