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/ext/standard/php_rand.h

http://github.com/infusion/PHP
C Header | 60 lines | 25 code | 9 blank | 26 comment | 2 complexity | 2f843268dabb5177d2430c9593cd921d MD5 | raw file
Possible License(s): MPL-2.0-no-copyleft-exception, LGPL-2.1, BSD-3-Clause 
    

  1. /*
    2. 

  2.    +----------------------------------------------------------------------+
    3. 

  3.    | PHP Version 5                                                        |
    4. 

  4.    +----------------------------------------------------------------------+
    5. 

  5.    | Copyright (c) 1997-2011 The PHP Group                                |
    6. 

  6.    +----------------------------------------------------------------------+
    7. 

  7.    | This source file is subject to version 3.01 of the PHP license,      |
    8. 

  8.    | that is bundled with this package in the file LICENSE, and is        |
    9. 

  9.    | available through the world-wide-web at the following url:           |
    10. 

  10.    | http://www.php.net/license/3_01.txt                                  |
    11. 

  11.    | If you did not receive a copy of the PHP license and are unable to   |
    12. 

  12.    | obtain it through the world-wide-web, please send a note to          |
    13. 

  13.    | license@php.net so we can mail you a copy immediately.               |
    14. 

  14.    +----------------------------------------------------------------------+
    15. 

  15.    | Authors: Rasmus Lerdorf <rasmus@php.net>                             |
    16. 

  16.    |          Zeev Suraski <zeev@zend.com>                                |
    17. 

  17.    |          Pedro Melo <melo@ip.pt>                                     |
    18. 

  18.    |          Sterling Hughes <sterling@php.net>                          |
    19. 

  19.    |                                                                      |
    20. 

  20.    | Based on code from: Shawn Cokus <Cokus@math.washington.edu>          |
    21. 

  21.    +----------------------------------------------------------------------+
    22. 

  22.  */
    23. 

  23. /* $Id: php_rand.h 306939 2011-01-01 02:19:59Z felipe $ */
    24. 

  24. 

  25. #ifndef PHP_RAND_H
    26. 

  26. #define	PHP_RAND_H
    27. 

  27. 

  28. #include <stdlib.h>
    29. 

  29. #include "basic_functions.h"
    30. 

  30. 

  31. /* System Rand functions */
    32. 

  32. #ifndef RAND_MAX
    33. 

  33. #define RAND_MAX (1<<15)
    34. 

  34. #endif
    35. 

  35. 

  36. /* In ZTS mode we rely on rand_r() so we must use RAND_MAX. */
    37. 

  37. #if !defined(ZTS) && (defined(HAVE_LRAND48) || defined(HAVE_RANDOM))
    38. 

  38. #define PHP_RAND_MAX 2147483647
    39. 

  39. #else
    40. 

  40. #define PHP_RAND_MAX RAND_MAX
    41. 

  41. #endif
    42. 

  42. 

  43. #define RAND_RANGE(__n, __min, __max, __tmax) \
    44. 

  44.     (__n) = (__min) + (long) ((double) ( (double) (__max) - (__min) + 1.0) * ((__n) / ((__tmax) + 1.0)))
    45. 

  45. 

  46. /* MT Rand */
    47. 

  47. #define PHP_MT_RAND_MAX ((long) (0x7FFFFFFF)) /* (1<<31) - 1 */ 
    48. 

  48. 

  49. #ifdef PHP_WIN32
    50. 

  50. #define GENERATE_SEED() (((long) (sapi_get_request_time(TSRMLS_C) * GetCurrentProcessId())) ^ ((long) (1000000.0 * php_combined_lcg(TSRMLS_C))))
    51. 

  51. #else
    52. 

  52. #define GENERATE_SEED() (((long) (sapi_get_request_time(TSRMLS_C) * getpid())) ^ ((long) (1000000.0 * php_combined_lcg(TSRMLS_C))))
    53. 

  53. #endif
    54. 

  54. 

  55. PHPAPI void php_srand(long seed TSRMLS_DC);
    56. 

  56. PHPAPI long php_rand(TSRMLS_D);
    57. 

  57. PHPAPI void php_mt_srand(php_uint32 seed TSRMLS_DC);
    58. 

  58. PHPAPI php_uint32 php_mt_rand(TSRMLS_D);
    59. 

  59. 

  60. #endif	/* PHP_RAND_H */
    61. 

  61.