libc/stdlib/seed48_r.c

   1 /* Copyright (C) 1995, 1997, 1998, 2001 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 <string.h>
  21 #include <limits.h>
  22
  23
  24 int seed48_r (unsigned short int seed16v[3], struct drand48_data *buffer)
  25 {
  26     /* Save old value at a private place to be used as return value.  */
  27     memcpy (buffer->__old_x, buffer->__x, sizeof (buffer->__x));
  28
  29     /* Install new state.  */
  30     buffer->__x[2] = seed16v[2];
  31     buffer->__x[1] = seed16v[1];
  32     buffer->__x[0] = seed16v[0];
  33     buffer->__a = 0x5deece66dull;
  34     buffer->__c = 0xb;
  35     buffer->__init = 1;
  36
  37     return 0;
  38 }
  39 libc_hidden_def(seed48_r)