1 /* Reentrant random function from POSIX.1c.
2 Copyright (C) 1996, 1999, 2009 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
6 The GNU C Library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 The GNU C Library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, see
18 <http://www.gnu.org/licenses/>. */
23 /* This algorithm is mentioned in the ISO C standard, here extended
26 rand_r (unsigned int *seed
)
28 unsigned int next
= *seed
;
33 result
= (unsigned int) (next
/ 65536) % 2048;
38 result
^= (unsigned int) (next
/ 65536) % 1024;
43 result
^= (unsigned int) (next
/ 65536) % 1024;