stdlib/nrand48_r.c

   1 /* Copyright (C) 1995-2017 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
  21 int
  22 __nrand48_r (unsigned short int xsubi[3], struct drand48_data *buffer,
  23              long int *result)
  24 {
  25   /* Compute next state.  */
  26   if (__drand48_iterate (xsubi, buffer) < 0)
  27     return -1;
  28
  29   /* Store the result.  */
  30   if (sizeof (unsigned short int) == 2)
  31     *result = xsubi[2] << 15 | xsubi[1] >> 1;
  32   else
  33     *result = xsubi[2] >> 1;
  34
  35   return 0;
  36 }
  37 weak_alias (__nrand48_r, nrand48_r)