OpenCores
URL https://opencores.org/ocsvn/or1k/or1k/trunk

Subversion Repositories or1k

[/] [or1k/] [trunk/] [linux/] [uClibc/] [libc/] [stdlib/] [rand_r.c] - Blame information for rev 1325

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 1325 phoenix
/* Reentrant random function frm POSIX.1c.
2
   Copyright (C) 1996, 1999 Free Software Foundation, Inc.
3
   This file is part of the GNU C Library.
4
   Contributed by Ulrich Drepper <drepper@cygnus.com <mailto:drepper@cygnus.com>>, 1996.
5
 
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.
10
 
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.
15
 
16
   You should have received a copy of the GNU Lesser General Public
17
   License along with the GNU C Library; if not, write to the Free
18
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19
   02111-1307 USA.  */
20
 
21
#include <stdlib.h>
22
 
23
 
24
/* This algorithm is mentioned in the ISO C standard, here extended
25
   for 32 bits.  */
26
int rand_r (unsigned int *seed)
27
{
28
    unsigned int next = *seed;
29
    int result;
30
 
31
    next *= 1103515245;
32
    next += 12345;
33
    result = (unsigned int) (next / 65536) % 2048;
34
 
35
    next *= 1103515245;
36
    next += 12345;
37
    result <<= 10;
38
    result ^= (unsigned int) (next / 65536) % 1024;
39
 
40
    next *= 1103515245;
41
    next += 12345;
42
    result <<= 10;
43
    result ^= (unsigned int) (next / 65536) % 1024;
44
 
45
    *seed = next;
46
 
47
    return result;
48
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.