stdlib/srand48_r.c

   1 /* Copyright (C) 1995 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
  17 not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18 Boston, MA 02111-1307, USA.  */
  19
  20 #include <stdlib.h>
  21
  22 int
  23 srand48_r (seedval, buffer)
  24      long seedval;
  25      struct drand48_data *buffer;
  26 {
  27   /* Be generous for the arguments, detect some errors.  */
  28   if (buffer == NULL)
  29     {
  30       errno = EFAULT;
  31       return -1;
  32     }
  33
  34   /* The standards say we only have 32 bits.  */
  35   if (sizeof (long) > 4)
  36     seedval &= 0xffffffffl;
  37
  38   if (sizeof (unsigned short int) == 2)
  39     {
  40       buffer->X[2] = seedval >> 16;
  41       buffer->X[1] = seedval & 0xffffl;
  42       buffer->X[0] = 0x330e;
  43     }
  44   else
  45     {
  46       buffer->X[2] = seedval;
  47       buffer->X[1] = 0x330e0000UL;
  48       buffer->X[0] = 0;
  49     }
  50
  51   return 0;
  52 }