1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * (C) Copyright 2003
4  * Gerry Hamel, geh@ti.com, Texas Instruments
5  */
6 
7 #ifndef __CIRCBUF_H__
8 #define __CIRCBUF_H__
9 
10 typedef struct circbuf {
11 	unsigned int size;	/* current number of bytes held */
12 	unsigned int totalsize; /* number of bytes allocated */
13 
14 	char *top;		/* pointer to current buffer start */
15 	char *tail;		/* pointer to space for next element */
16 
17 	char *data;		/* all data */
18 	char *end;		/* end of data buffer */
19 } circbuf_t;
20 
21 int buf_init (circbuf_t * buf, unsigned int size);
22 int buf_free (circbuf_t * buf);
23 int buf_pop (circbuf_t * buf, char *dest, unsigned int len);
24 int buf_push (circbuf_t * buf, const char *src, unsigned int len);
25 
26 #endif
27