/* DLIFE Copyright (C) 2000 Richard W.M. Jones <rich@annexia.org>
 * and other authors listed in the ``AUTHORS'' file.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Id: random.h,v 1.1 2002/04/05 14:40:28 rich Exp $
 */

#ifndef random_h
#define random_h

#include "config.h"

#include <stdlib.h>

extern void random_init (void);

/* Define this to run on a fault-free ``perfect'' CPU. (Use this
 * only when debugging).
 */
#define PERFECT_CPU 0

/* Return true 1 in PROBABILITY times. The argument PROBABILITY
 * is not limited to just powers of 2, but it must be an integer.
 */
extern inline int
chance (unsigned probability)
{
#if !PERFECT_CPU
  return ((unsigned)random() % probability) == 0;
#else
  return 0;
#endif
}

/* Return 32 bits of randomness. */
extern inline unsigned
get_rand_int ()
{
  return (unsigned)random();
}

/* Return 16 bits of randomness. */
extern inline unsigned
get_rand_short ()
{
  return (unsigned)random() & 0xffff;
}

/* Return 8 bits of randomness. */
extern inline unsigned
get_rand_byte ()
{
  return (unsigned)random() & 0xff;
}

#endif /* random_h */