php_rand.h

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/*
   +----------------------------------------------------------------------+
   | PHP Version 5                                                        |
   +----------------------------------------------------------------------+
   | Copyright (c) 1997-2006 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          |
   | [e-mail] so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Authors: Rasmus Lerdorf <[e-mail]>                             |
   |          Zeev Suraski <[e-mail]>                                |
   |          Pedro Melo <[e-mail]>                                     |
   |          Sterling Hughes <[e-mail]>                          |
   |                                                                      |
   | Based on code from: Shawn Cokus <[e-mail]>          |
   +----------------------------------------------------------------------+
 */
/* $Id: php_rand.h,v 1.28.2.1 2006/01/01 12:50:15 sniper Exp $ */

#ifndef PHP_RAND_H
#define	PHP_RAND_H

#include <stdlib.h>
#include "basic_functions.h"

/* System Rand functions */
#ifndef RAND_MAX
#define RAND_MAX (1<<15)
#endif

/* In ZTS mode we rely on rand_r() so we must use RAND_MAX. */
#if !defined(ZTS) && (defined(HAVE_LRAND48) || defined(HAVE_RANDOM))
#define PHP_RAND_MAX 2147483647
#else
#define PHP_RAND_MAX RAND_MAX
#endif

#define RAND_RANGE(__n, __min, __max, __tmax) \
    (__n) = (__min) + (long) ((double) ( (double) (__max) - (__min) + 1.0) * ((__n) / ((__tmax) + 1.0)))

/* MT Rand */
#define PHP_MT_RAND_MAX ((long) (0x7FFFFFFF)) /* (1<<31) - 1 */ 

#ifdef PHP_WIN32
#define GENERATE_SEED() ((long) (time(0) * GetCurrentProcessId() * 1000000 * php_combined_lcg(TSRMLS_C)))
#else
#define GENERATE_SEED() ((long) (time(0) * getpid() * 1000000 * php_combined_lcg(TSRMLS_C)))
#endif

PHPAPI void php_srand(long seed TSRMLS_DC);
PHPAPI long php_rand(TSRMLS_D);
PHPAPI void php_mt_srand(php_uint32 seed TSRMLS_DC);
PHPAPI php_uint32 php_mt_rand(TSRMLS_D);

#endif	/* PHP_RAND_H */