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[glibc.git] / stdlib / jrand48_r.c
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1 /* Copyright (C) 1995, 1997, 1998 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.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public License as
7 published by the Free Software Foundation; either version 2 of the
8 License, or (at your option) any later version.
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 Library General Public License for more details.
15 You should have received a copy of the GNU Library General Public
16 License along with the GNU C Library; see the file COPYING.LIB. If not,
17 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA. */
20 #include <stdlib.h>
22 int
23 __jrand48_r (xsubi, buffer, result)
24 unsigned short int xsubi[3];
25 struct drand48_data *buffer;
26 long int *result;
28 /* Compute next state. */
29 if (__drand48_iterate (xsubi, buffer) < 0)
30 return -1;
32 /* Store the result. */
33 if (sizeof (unsigned short int) == 2)
34 *result = ((xsubi[2] & 0x7fff) << 16) | xsubi[1];
35 else
36 *result = xsubi[2] & 0x7fffffffl;
38 if (xsubi[2] & (1 << (sizeof (xsubi[2]) * 8 - 1)))
39 *result *= -1;
41 return 0;
43 weak_alias (__jrand48_r, jrand48_r)