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Diffstat (limited to 'src')
| -rw-r--r-- | src/library.js | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/library.js b/src/library.js index 634f98dc..a7ac6fc0 100644 --- a/src/library.js +++ b/src/library.js @@ -3472,6 +3472,28 @@ LibraryManager.library = { return limit; }, + // A glibc-like implementation of the C random number generation functions: + // http://pubs.opengroup.org/onlinepubs/000095399/functions/rand.html + __rand_state: 42, + srand__deps: ['__rand_state'], + srand: function(seed) { + // void srand(unsigned seed); + ___rand_state = seed; + }, + rand__deps: ['__rand_state'], + rand: function() { + // int rand(void); + ___rand_state = (1103515245 * ___rand_state + 12345) % 0x100000000; + return ___rand_state & 0x7FFFFFFF; + }, + rand_r: function(seed) { + // int rand_r(unsigned *seed); + var state = {{{ makeGetValue('seed', 0, 'i32') }}}; + state = (1103515245 * state + 12345) % 0x100000000; + {{{ makeSetValue('seed', 0, 'state', 'i32') }}} + return state & 0x7FFFFFFF; + }, + // ========================================================================== // string.h // ========================================================================== |