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1#ifndef FIO_FIFO_H
2#define FIO_FIFO_H
3/*
4 * A simple FIFO implementation.
5 *
6 * Copyright (C) 2004 Stelian Pop <stelian@popies.net>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 *
22 */
23#include "minmax.h"
24
25struct fifo {
26 unsigned char *buffer; /* the buffer holding the data */
27 unsigned int size; /* the size of the allocated buffer */
28 unsigned int in; /* data is added at offset (in % size) */
29 unsigned int out; /* data is extracted from off. (out % size) */
30};
31
32struct fifo *fifo_alloc(unsigned int);
33unsigned int fifo_put(struct fifo *, void *, unsigned int);
34unsigned int fifo_get(struct fifo *, void *, unsigned int);
35void fifo_free(struct fifo *);
36
37static inline unsigned int fifo_len(struct fifo *fifo)
38{
39 return fifo->in - fifo->out;
40}
41
42static inline unsigned int fifo_room(struct fifo *fifo)
43{
44 return fifo->size - fifo->in + fifo->out;
45}
46
47#endif