circ_buf.h File Reference

Go to the source code of this file.

Data Structures
struct	circ_buf

Macros
#define	CIRC_CNT(head, tail, size)   (((head) - (tail)) & ((size)-1))
#define	CIRC_SPACE(head, tail, size)   CIRC_CNT((tail),((head)+1),(size))
#define	CIRC_CNT_TO_END(head, tail, size)
#define	CIRC_SPACE_TO_END(head, tail, size)

Macro Definition Documentation

#define CIRC_CNT	(		head,
			tail,
			size
	)		(((head) - (tail)) & ((size)-1))

Definition at line 15 of file circ_buf.h.

#define CIRC_CNT_TO_END	(		head,
			tail,
			size
	)

Value:

({int end = (size) - (tail); \
      int n = ((head) + end) & ((size)-1); \
      n < end ? n : end;})

Definition at line 25 of file circ_buf.h.

#define CIRC_SPACE	(		head,
			tail,
			size
	)		CIRC_CNT((tail),((head)+1),(size))

Definition at line 20 of file circ_buf.h.

#define CIRC_SPACE_TO_END	(		head,
			tail,
			size
	)

Value:

({int end = (size) - 1 - (head); \
      int n = (end + (tail)) & ((size)-1); \
      n <= end ? n : end+1;})

Definition at line 31 of file circ_buf.h.