xref: /PHP-7.1/ext/standard/rand.c (revision ccd4716e) 
1 /*
2    +----------------------------------------------------------------------+
3    | PHP Version 7                                                        |
4    +----------------------------------------------------------------------+
5    | Copyright (c) 1997-2018 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: Richard J. Wagner <rjwagner@writeme.com>         |
21    |                     Makoto Matsumoto <matumoto@math.keio.ac.jp>      |
22    |                     Takuji Nishimura                                 |
23    |                     Shawn Cokus <Cokus@math.washington.edu>          |
24    +----------------------------------------------------------------------+
25  */
26 /* $Id$ */
27 
28 #include "php.h"
29 #include "php_rand.h"
30 #include "php_mt_rand.h"
31 
32 /* {{{ php_srand
33  */
php_srand(zend_long seed)34 PHPAPI void php_srand(zend_long seed)
35 {
36 	php_mt_srand(seed);
37 }
38 /* }}} */
39 
40 /* {{{ php_rand
41  */
php_rand(void)42 PHPAPI zend_long php_rand(void)
43 {
44 	return php_mt_rand();
45 }
46 /* }}} */
47 
48 /* {{{ proto int mt_rand([int min, int max])
49    Returns a random number from Mersenne Twister */
PHP_FUNCTION(rand)50 PHP_FUNCTION(rand)
51 {
52 	zend_long min;
53 	zend_long max;
54 	int argc = ZEND_NUM_ARGS();
55 
56 	if (argc == 0) {
57 		RETURN_LONG(php_mt_rand() >> 1);
58 	}
59 
60 	if (zend_parse_parameters(argc, "ll", &min, &max) == FAILURE) {
61 		return;
62 	}
63 
64 	if (max < min) {
65 		RETURN_LONG(php_mt_rand_common(max, min));
66 	}
67 
68 	RETURN_LONG(php_mt_rand_common(min, max));
69 }
70 /* }}} */
71 
72 /*
73  * Local variables:
74  * tab-width: 4
75  * c-basic-offset: 4
76  * End:
77  * vim600: noet sw=4 ts=4 fdm=marker
78  * vim<600: noet sw=4 ts=4
79  */
80