mirror of
https://github.com/php/php-src.git
synced 2024-09-22 18:37:25 +00:00
8d3f8ca12a
The $Id$ keywords were used in Subversion where they can be substituted with filename, last revision number change, last changed date, and last user who changed it. In Git this functionality is different and can be done with Git attribute ident. These need to be defined manually for each file in the .gitattributes file and are afterwards replaced with 40-character hexadecimal blob object name which is based only on the particular file contents. This patch simplifies handling of $Id$ keywords by removing them since they are not used anymore.
75 lines
3.1 KiB
C
75 lines
3.1 KiB
C
/*
|
|
+----------------------------------------------------------------------+
|
|
| PHP Version 7 |
|
|
+----------------------------------------------------------------------+
|
|
| Copyright (c) 1997-2018 The PHP Group |
|
|
+----------------------------------------------------------------------+
|
|
| This source file is subject to version 3.01 of the PHP license, |
|
|
| that is bundled with this package in the file LICENSE, and is |
|
|
| available through the world-wide-web at the following url: |
|
|
| http://www.php.net/license/3_01.txt |
|
|
| If you did not receive a copy of the PHP license and are unable to |
|
|
| obtain it through the world-wide-web, please send a note to |
|
|
| license@php.net so we can mail you a copy immediately. |
|
|
+----------------------------------------------------------------------+
|
|
| Authors: Rasmus Lerdorf <rasmus@php.net> |
|
|
| Zeev Suraski <zeev@zend.com> |
|
|
| Pedro Melo <melo@ip.pt> |
|
|
| Sterling Hughes <sterling@php.net> |
|
|
| |
|
|
| Based on code from: Shawn Cokus <Cokus@math.washington.edu> |
|
|
+----------------------------------------------------------------------+
|
|
*/
|
|
|
|
#ifndef PHP_RAND_H
|
|
#define PHP_RAND_H
|
|
|
|
#include "php_lcg.h"
|
|
#include "php_mt_rand.h"
|
|
|
|
/* System Rand functions */
|
|
#ifndef RAND_MAX
|
|
#define RAND_MAX PHP_MT_RAND_MAX
|
|
#endif
|
|
|
|
#define PHP_RAND_MAX PHP_MT_RAND_MAX
|
|
|
|
/*
|
|
* A bit of tricky math here. We want to avoid using a modulus because
|
|
* that simply tosses the high-order bits and might skew the distribution
|
|
* of random values over the range. Instead we map the range directly.
|
|
*
|
|
* We need to map the range from 0...M evenly to the range a...b
|
|
* Let n = the random number and n' = the mapped random number
|
|
*
|
|
* Then we have: n' = a + n(b-a)/M
|
|
*
|
|
* We have a problem here in that only n==M will get mapped to b which
|
|
# means the chances of getting b is much much less than getting any of
|
|
# the other values in the range. We can fix this by increasing our range
|
|
# artificially and using:
|
|
#
|
|
# n' = a + n(b-a+1)/M
|
|
*
|
|
# Now we only have a problem if n==M which would cause us to produce a
|
|
# number of b+1 which would be bad. So we bump M up by one to make sure
|
|
# this will never happen, and the final algorithm looks like this:
|
|
#
|
|
# n' = a + n(b-a+1)/(M+1)
|
|
*
|
|
* -RL
|
|
*/
|
|
#define RAND_RANGE_BADSCALING(__n, __min, __max, __tmax) \
|
|
(__n) = (__min) + (zend_long) ((double) ( (double) (__max) - (__min) + 1.0) * ((__n) / ((__tmax) + 1.0)))
|
|
|
|
#ifdef PHP_WIN32
|
|
#define GENERATE_SEED() (((zend_long) (time(0) * GetCurrentProcessId())) ^ ((zend_long) (1000000.0 * php_combined_lcg())))
|
|
#else
|
|
#define GENERATE_SEED() (((zend_long) (time(0) * getpid())) ^ ((zend_long) (1000000.0 * php_combined_lcg())))
|
|
#endif
|
|
|
|
PHPAPI void php_srand(zend_long seed);
|
|
PHPAPI zend_long php_rand(void);
|
|
|
|
#endif /* PHP_RAND_H */
|