uclibc-ng/libc/stdlib/seed48_r.c

/* Copyright (C) 1995, 1997, 1998, 2001 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.

   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>
#include <string.h>
#include <limits.h>

int seed48_r (unsigned short int seed16v[3], struct drand48_data *buffer)
{
    /* Save old value at a private place to be used as return value.  */
    memcpy (buffer->__old_x, buffer->__x, sizeof (buffer->__x));

    /* Install new state.  */
    buffer->__x[2] = seed16v[2];
    buffer->__x[1] = seed16v[1];
    buffer->__x[0] = seed16v[0];
    buffer->__a = 0x5deece66dull;
    buffer->__c = 0xb;
    buffer->__init = 1;

    return 0;
}