stdlib/seed48_r.c

   1 /* Copyright (C) 1995, 1997 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 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 #if USHRT_MAX == 0xffffU
  34   buffer->X[2] = seed16v[2];
  35   buffer->X[1] = seed16v[1];
  36   buffer->X[0] = seed16v[0];
  37
  38   buffer->a[2] = 0x5;
  39   buffer->a[1] = 0xdeec;
  40   buffer->a[0] = 0xe66d;
  41 #else
  42   buffer->X[2] = (seed16v[2] << 16) | seed16v[1];
  43   buffer->X[1] = seed16v[0] << 16;
  44   buffer->X[0] = 0;
  45
  46   buffer->a[2] = 0x5deecUL;
  47   buffer->a[1] = 0xe66d0000UL;
  48   buffer->a[0] = 0;
  49 #endif
  50   buffer->c = 0xb;
  51   buffer->init = 1;
  52
  53   return 0;
  54 }
  55 weak_alias (__seed48_r, seed48_r)