stdlib/srand48_r.c

   1 /* Copyright (C) 1995-2024 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <stdlib.h>
  19 #include <limits.h>
  20
  21 int
  22 __srand48_r (long int seedval, struct drand48_data *buffer)
  23 {
  24   /* The standards say we only have 32 bits.  */
  25   if (sizeof (long int) > 4)
  26     seedval &= 0xffffffffl;
  27
  28   buffer->__x[2] = seedval >> 16;
  29   buffer->__x[1] = seedval & 0xffffl;
  30   buffer->__x[0] = 0x330e;
  31
  32   buffer->__a = 0x5deece66dull;
  33   buffer->__c = 0xb;
  34   buffer->__init = 1;
  35
  36   return 0;
  37 }
  38 weak_alias (__srand48_r, srand48_r)