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fifo.h

/*
 * A simple FIFO implementation.
 *
 * Copyright (C) 2004 Stelian Pop <stelian@popies.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */
struct fifo {
      unsigned char *buffer;  /* the buffer holding the data */
      unsigned int size;      /* the size of the allocated buffer */
      unsigned int in;  /* data is added at offset (in % size) */
      unsigned int out; /* data is extracted from off. (out % size) */
};

struct fifo *fifo_alloc(unsigned int);
unsigned int fifo_put(struct fifo *, void *, unsigned int);
unsigned int fifo_get(struct fifo *, void *, unsigned int);
void fifo_free(struct fifo *);

static inline unsigned int fifo_len(struct fifo *fifo)
{
      return fifo->in - fifo->out;
}

static inline unsigned int fifo_room(struct fifo *fifo)
{
      return fifo->size - fifo->in + fifo->out;
}

#define min(x,y) ({ \
      typeof(x) _x = (x);     \
      typeof(y) _y = (y);     \
      (void) (&_x == &_y);          \
      _x < _y ? _x : _y; })

#define max(x,y) ({ \
      typeof(x) _x = (x);     \
      typeof(y) _y = (y);     \
      (void) (&_x == &_y);          \
      _x > _y ? _x : _y; })


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