stdlib/seed48_r.c

   1 /* Copyright (C) 1995-2022 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 <string.h>
  20 #include <limits.h>
  21
  22 int
  23 __seed48_r (unsigned short int seed16v[3], struct drand48_data *buffer)
  24 {
  25   /* Save old value at a private place to be used as return value.  */
  26   memcpy (buffer->__old_x, buffer->__x, sizeof (buffer->__x));
  27
  28   /* Install new state.  */
  29   buffer->__x[2] = seed16v[2];
  30   buffer->__x[1] = seed16v[1];
  31   buffer->__x[0] = seed16v[0];
  32   buffer->__a = 0x5deece66dull;
  33   buffer->__c = 0xb;
  34   buffer->__init = 1;
  35
  36   return 0;
  37 }
  38 weak_alias (__seed48_r, seed48_r)