1/*
2   +----------------------------------------------------------------------+
3   | PHP Version 5                                                        |
4   +----------------------------------------------------------------------+
5   | Copyright (c) 1997-2014 The PHP Group                                |
6   +----------------------------------------------------------------------+
7   | This source file is subject to version 3.01 of the PHP license,      |
8   | that is bundled with this package in the file LICENSE, and is        |
9   | available through the world-wide-web at the following url:           |
10   | http://www.php.net/license/3_01.txt                                  |
11   | If you did not receive a copy of the PHP license and are unable to   |
12   | obtain it through the world-wide-web, please send a note to          |
13   | license@php.net so we can mail you a copy immediately.               |
14   +----------------------------------------------------------------------+
15   | Authors: Rasmus Lerdorf <rasmus@php.net>                             |
16   |          Zeev Suraski <zeev@zend.com>                                |
17   |          Pedro Melo <melo@ip.pt>                                     |
18   |          Sterling Hughes <sterling@php.net>                          |
19   |                                                                      |
20   | Based on code from: Shawn Cokus <Cokus@math.washington.edu>          |
21   +----------------------------------------------------------------------+
22 */
23/* $Id$ */
24
25#ifndef PHP_RAND_H
26#define PHP_RAND_H
27
28#include <stdlib.h>
29#include "basic_functions.h"
30#include "php_lcg.h"
31
32/* System Rand functions */
33#ifndef RAND_MAX
34#define RAND_MAX (1<<15)
35#endif
36
37/* In ZTS mode we rely on rand_r() so we must use RAND_MAX. */
38#if !defined(ZTS) && (defined(HAVE_LRAND48) || defined(HAVE_RANDOM))
39#define PHP_RAND_MAX 2147483647
40#else
41#define PHP_RAND_MAX RAND_MAX
42#endif
43
44#define RAND_RANGE(__n, __min, __max, __tmax) \
45    (__n) = (__min) + (long) ((double) ( (double) (__max) - (__min) + 1.0) * ((__n) / ((__tmax) + 1.0)))
46
47/* MT Rand */
48#define PHP_MT_RAND_MAX ((long) (0x7FFFFFFF)) /* (1<<31) - 1 */
49
50#ifdef PHP_WIN32
51#define GENERATE_SEED() (((long) (time(0) * GetCurrentProcessId())) ^ ((long) (1000000.0 * php_combined_lcg(TSRMLS_C))))
52#else
53#define GENERATE_SEED() (((long) (time(0) * getpid())) ^ ((long) (1000000.0 * php_combined_lcg(TSRMLS_C))))
54#endif
55
56PHPAPI void php_srand(long seed TSRMLS_DC);
57PHPAPI long php_rand(TSRMLS_D);
58PHPAPI void php_mt_srand(php_uint32 seed TSRMLS_DC);
59PHPAPI php_uint32 php_mt_rand(TSRMLS_D);
60
61#endif  /* PHP_RAND_H */
62