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117 lines
3.9 KiB
C
117 lines
3.9 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP version 4.0 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997-2001 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.02 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available at through the world-wide-web at |
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| http://www.php.net/license/2_02.txt. |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Rasmus Lerdorf <rasmus@lerdorf.on.ca> |
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| Zeev Suraski <zeev@zend.com> |
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| Pedro Melo <melo@ip.pt> |
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| Jeroen van Wolffelaar <jeroen@php.net> |
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| |
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| Based on code from: Shawn Cokus <Cokus@math.washington.edu> |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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/* Layout implementation random functions
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*
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* The PHPAPI contains these functions:
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* - long php_rand()
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* - long php_rand_range(long min, long max)
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* - void php_srand()
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* - long php_getrandmax()
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*
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* Note that it is not possible to choose the algoritm. This is done to
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* give the user the possibility to control all randomness by means of
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* srand()/php.ini in a portable and consistent way.
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*
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*
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* --Jeroen
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*/
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/* TODO:
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* - make constants available to PHP-user
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* - MINFO section about which random number generators are available
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* - Nuke randmax by enhancing PHP_RAND_RANGE to work well in the case of a
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* greater request than the real (internal) randmax is
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* - Implement LCG
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* - Implement a real-random source? (via internet, and/or /dev/urandom?)
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* - Can lrand48 be thread-safe?
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* - Is random() useful sometimes?
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* - Which system algorithms are available, maybe name them after real
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* algorithm by compile-time detection?
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* - Get this to compile :-)
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*/
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#ifndef PHP_RAND_H
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#define PHP_RAND_H
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#include <stdlib.h>
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/* FIXME: that '_php_randgen_entry' needed, or not? */
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typedef struct _php_randgen_entry {
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void (*srand)(long seed);
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long (*rand)(void);
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long randmax;
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char *ini_str;
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} php_randgen_entry;
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/* an ARRAY of POINTERS, not vice versa */
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extern php_randgen_entry *php_randgen_entries[];
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#define PHP_RANDGEN_ENTRY(which, nsrand, nrand, nrandmax, nini_str) { \
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php_randgen_entries[which] = emalloc(sizeof(php_randgen_entry)); \
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php_randgen_entries[which]->srand = nsrand; \
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php_randgen_entries[which]->rand = nrand; \
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php_randgen_entries[which]->randmax = nrandmax; \
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php_randgen_entries[which]->ini_str = nini_str; \
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}
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/* Define random generator constants */
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#define PHP_RAND_SYS 0
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#define PHP_RAND_LRAND48 1
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#define PHP_RAND_MT 2
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#define PHP_RAND_LCG 3
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#define PHP_RAND_DEFAULT PHP_RAND_MT
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/* how many there are */
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#define PHP_RAND_NUMRANDS 4
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/* Proto's */
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PHP_RINIT_FUNCTION(rand);
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PHP_MINIT_FUNCTION(rand);
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PHP_MINIT_FUNCTION(rand_mt);
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PHP_MINIT_FUNCTION(rand_sys);
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PHP_FUNCTION(srand);
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PHP_FUNCTION(rand);
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PHP_FUNCTION(getrandmax);
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PHP_FUNCTION(mt_srand);
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PHP_FUNCTION(mt_rand);
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PHP_FUNCTION(mt_getrandmax);
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PHPAPI long php_rand(void);
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PHPAPI long php_rand_range(long min, long max TSRMLS_DC);
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PHPAPI double php_drand(void);
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PHPAPI long php_randmax(void);
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#endif /* PHP_RAND_H */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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* vim600: fdm=marker
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* vim: sw=4 ts=4 tw=78
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*/
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