stdlib/seed48_r.c

   1 /* Copyright (C) 1995, 1997, 1998, 2001 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <limits.h>
  23
  24 int
  25 __seed48_r (seed16v, buffer)
  26      unsigned short int seed16v[3];
  27      struct drand48_data *buffer;
  28 {
  29   /* Save old value at a private place to be used as return value.  */
  30   memcpy (buffer->__old_x, buffer->__x, sizeof (buffer->__x));
  31
  32   /* Install new state.  */
  33   buffer->__x[2] = seed16v[2];
  34   buffer->__x[1] = seed16v[1];
  35   buffer->__x[0] = seed16v[0];
  36   buffer->__a = 0x5deece66dull;
  37   buffer->__c = 0xb;
  38   buffer->__init = 1;
  39
  40   return 0;
  41 }
  42 weak_alias (__seed48_r, seed48_r)