diff options
| author | Sterling Hughes <sterling@php.net> | 2001-09-09 10:44:12 +0000 |
|---|---|---|
| committer | Sterling Hughes <sterling@php.net> | 2001-09-09 10:44:12 +0000 |
| commit | 6963ac405006e66a1628eaae057f92fd9ca83f6e (patch) | |
| tree | 90f924521fee6eccb1b45309481fb3fba0abfa9a /ext/standard/rand.c | |
| parent | eede70a84fdf152261a6f0ab4e96c54cf9c1c9a5 (diff) | |
| download | php-git-6963ac405006e66a1628eaae057f92fd9ca83f6e.tar.gz | |
export the mt rand functions...
Diffstat (limited to 'ext/standard/rand.c')
| -rw-r--r-- | ext/standard/rand.c | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/ext/standard/rand.c b/ext/standard/rand.c index 144fefce22..7b419bd38e 100644 --- a/ext/standard/rand.c +++ b/ext/standard/rand.c @@ -92,11 +92,9 @@ #define loBits(u) ((u) & 0x7FFFFFFFU) /* mask the highest bit of u */ #define mixBits(u, v) (hiBit(u)|loBits(v)) /* move hi bit of u to hi bit of v */ -#define MT_RAND_MAX ((long)(0x7FFFFFFF)) /* (1<<31) - 1 */ - -/* {{{ seedMT +/* {{{ php_mt_srand */ -static void seedMT(php_uint32 seed TSRMLS_DC) +PHPAPI void php_mt_srand(php_uint32 seed TSRMLS_DC) { /* We initialize state[0..(N-1)] via the generator @@ -158,7 +156,7 @@ static php_uint32 reloadMT(TSRMLS_D) register int j; if (BG(left) < -1) - seedMT(4357U TSRMLS_CC); + php_mt_srand(4357U TSRMLS_CC); BG(left) = N - 1, BG(next) = BG(state) + 1; @@ -177,7 +175,7 @@ static php_uint32 reloadMT(TSRMLS_D) } -static php_uint32 randomMT(TSRMLS_D) +PHPAPI php_uint32 php_mt_rand(TSRMLS_D) { php_uint32 y; @@ -214,7 +212,7 @@ PHP_FUNCTION(mt_srand) if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "l", &seed) == FAILURE) return; - seedMT(seed TSRMLS_CC); + php_mt_srand(seed TSRMLS_CC); } /* }}} */ @@ -244,8 +242,8 @@ PHP_FUNCTION(mt_srand) * * -RL */ -#define RAND_RANGE(__n, __min, __max) \ - (__n) = (__min) + (long) ((double) ((__max) - (__min) + 1.0) * ((__n) / (PHP_RAND_MAX + 1.0))) +#define RAND_RANGE(__n, __min, __max, __tmax) \ + (__n) = (__min) + (long) ((double) ((__max) - (__min) + 1.0) * ((__n) / ((__tmax) + 1.0))) /* {{{ proto int rand([int min, int max]) Returns a random number */ @@ -261,7 +259,7 @@ PHP_FUNCTION(rand) number = php_rand(); if (argc == 2) { - RAND_RANGE(number, min, max); + RAND_RANGE(number, min, max, PHP_RAND_MAX); } RETURN_LONG(number); @@ -288,9 +286,9 @@ PHP_FUNCTION(mt_rand) * Update: * I talked with Cokus via email and it won't ruin the algorithm */ - number = (long) (randomMT(TSRMLS_C) >> 1); + number = (long) (php_mt_rand(TSRMLS_C) >> 1); if (argc == 2) { - RAND_RANGE(number, min, max); + RAND_RANGE(number, min, max, PHP_MT_RAND_MAX); } RETURN_LONG(number); @@ -321,7 +319,7 @@ PHP_FUNCTION(mt_getrandmax) * Melo: it could be 2^^32 but we only use 2^^31 to maintain * compatibility with the previous php_rand */ - RETURN_LONG(MT_RAND_MAX); /* 2^^31 */ + RETURN_LONG(PHP_MT_RAND_MAX); /* 2^^31 */ } /* }}} */ |