stdlib/srand48_r.c

   1 /* Copyright (C) 1995-2018 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <stdlib.h>
  20 #include <limits.h>
  21
  22 int
  23 __srand48_r (long int seedval, struct drand48_data *buffer)
  24 {
  25   /* The standards say we only have 32 bits.  */
  26   if (sizeof (long int) > 4)
  27     seedval &= 0xffffffffl;
  28
  29   buffer->__x[2] = seedval >> 16;
  30   buffer->__x[1] = seedval & 0xffffl;
  31   buffer->__x[0] = 0x330e;
  32
  33   buffer->__a = 0x5deece66dull;
  34   buffer->__c = 0xb;
  35   buffer->__init = 1;
  36
  37   return 0;
  38 }
  39 weak_alias (__srand48_r, srand48_r)