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/* Reentrant random function frm POSIX.1c.

   Copyright (C) 1996, 1999 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com <mailto:drepper@cygnus.com>>, 1996.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, write to the Free

   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

   02111-1307 USA.  */

#include <stdlib.h>

/* This algorithm is mentioned in the ISO C standard, here extended

   for 32 bits.  */

int rand_r (unsigned int *seed)

{

    unsigned int next = *seed;

    int result;

    next *= 1103515245;

    next += 12345;

    result = (unsigned int) (next / 65536) % 2048;

    next *= 1103515245;

    next += 12345;

    result <<= 10;

    result ^= (unsigned int) (next / 65536) % 1024;

    next *= 1103515245;

    next += 12345;

    result <<= 10;

    result ^= (unsigned int) (next / 65536) % 1024;

    *seed = next;

    return result;

}