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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2014 Intel Corporation.
* Copyright (c) 2009, Olivier MATZ <zer0@droids-corp.org>
* All rights reserved.
*/
#ifndef _CIRBUF_H_
#define _CIRBUF_H_
#include <rte_config.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* This structure is the header of a cirbuf type.
*/
struct cirbuf {
unsigned int maxlen; /**< total len of the fifo (number of elements) */
unsigned int start; /**< indice of the first elt */
unsigned int end; /**< indice of the last elt */
unsigned int len; /**< current len of fifo */
char *buf;
};
#ifdef RTE_LIBRTE_CMDLINE_DEBUG
#define dprintf_(fmt, ...) printf("line %3.3d - " fmt "%.0s", __LINE__, __VA_ARGS__)
#define dprintf(...) dprintf_(__VA_ARGS__, "dummy")
#else
#define dprintf(...) (void)0
#endif
/**
* Init the circular buffer
*/
int cirbuf_init(struct cirbuf *cbuf, char *buf, unsigned int start, unsigned int maxlen);
/**
* Return 1 if the circular buffer is full
*/
#define CIRBUF_IS_FULL(cirbuf) ((cirbuf)->maxlen == (cirbuf)->len)
/**
* Return 1 if the circular buffer is empty
*/
#define CIRBUF_IS_EMPTY(cirbuf) ((cirbuf)->len == 0)
/**
* return current size of the circular buffer (number of used elements)
*/
#define CIRBUF_GET_LEN(cirbuf) ((cirbuf)->len)
/**
* return size of the circular buffer (used + free elements)
*/
#define CIRBUF_GET_MAXLEN(cirbuf) ((cirbuf)->maxlen)
/**
* return the number of free elts
*/
#define CIRBUF_GET_FREELEN(cirbuf) ((cirbuf)->maxlen - (cirbuf)->len)
/**
* Iterator for a circular buffer
* c: struct cirbuf pointer
* i: an integer type internally used in the macro
* e: char that takes the value for each iteration
*/
#define CIRBUF_FOREACH(c, i, e) \
for ( i=0, e=(c)->buf[(c)->start] ; \
i<((c)->len) ; \
i ++, e=(c)->buf[((c)->start+i)%((c)->maxlen)])
/**
* Add a character at head of the circular buffer. Return 0 on success, or
* a negative value on error.
*/
int cirbuf_add_head_safe(struct cirbuf *cbuf, char c);
/**
* Add a character at head of the circular buffer. You _must_ check that you
* have enough free space in the buffer before calling this func.
*/
void cirbuf_add_head(struct cirbuf *cbuf, char c);
/**
* Add a character at tail of the circular buffer. Return 0 on success, or
* a negative value on error.
*/
int cirbuf_add_tail_safe(struct cirbuf *cbuf, char c);
/**
* Add a character at tail of the circular buffer. You _must_ check that you
* have enough free space in the buffer before calling this func.
*/
void cirbuf_add_tail(struct cirbuf *cbuf, char c);
/**
* Remove a char at the head of the circular buffer. Return 0 on
* success, or a negative value on error.
*/
int cirbuf_del_head_safe(struct cirbuf *cbuf);
/**
* Remove a char at the head of the circular buffer. You _must_ check
* that buffer is not empty before calling the function.
*/
void cirbuf_del_head(struct cirbuf *cbuf);
/**
* Remove a char at the tail of the circular buffer. Return 0 on
* success, or a negative value on error.
*/
int cirbuf_del_tail_safe(struct cirbuf *cbuf);
/**
* Remove a char at the tail of the circular buffer. You _must_ check
* that buffer is not empty before calling the function.
*/
void cirbuf_del_tail(struct cirbuf *cbuf);
/**
* Return the head of the circular buffer. You _must_ check that
* buffer is not empty before calling the function.
*/
char cirbuf_get_head(struct cirbuf *cbuf);
/**
* Return the tail of the circular buffer. You _must_ check that
* buffer is not empty before calling the function.
*/
char cirbuf_get_tail(struct cirbuf *cbuf);
/**
* Add a buffer at head of the circular buffer. 'c' is a pointer to a
* buffer, and n is the number of char to add. Return the number of
* copied bytes on success, or a negative value on error.
*/
int cirbuf_add_buf_head(struct cirbuf *cbuf, const char *c, unsigned int n);
/**
* Add a buffer at tail of the circular buffer. 'c' is a pointer to a
* buffer, and n is the number of char to add. Return the number of
* copied bytes on success, or a negative value on error.
*/
int cirbuf_add_buf_tail(struct cirbuf *cbuf, const char *c, unsigned int n);
/**
* Remove chars at the head of the circular buffer. Return 0 on
* success, or a negative value on error.
*/
int cirbuf_del_buf_head(struct cirbuf *cbuf, unsigned int size);
/**
* Remove chars at the tail of the circular buffer. Return 0 on
* success, or a negative value on error.
*/
int cirbuf_del_buf_tail(struct cirbuf *cbuf, unsigned int size);
/**
* Copy a maximum of 'size' characters from the head of the circular
* buffer to a flat one pointed by 'c'. Return the number of copied
* chars.
*/
int cirbuf_get_buf_head(struct cirbuf *cbuf, char *c, unsigned int size);
/**
* Copy a maximum of 'size' characters from the tail of the circular
* buffer to a flat one pointed by 'c'. Return the number of copied
* chars.
*/
int cirbuf_get_buf_tail(struct cirbuf *cbuf, char *c, unsigned int size);
/**
* Set the start of the data to the index 0 of the internal buffer.
*/
int cirbuf_align_left(struct cirbuf *cbuf);
/**
* Set the end of the data to the last index of the internal buffer.
*/
int cirbuf_align_right(struct cirbuf *cbuf);
#ifdef __cplusplus
}
#endif
#endif /* _CIRBUF_H_ */
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