diff options
Diffstat (limited to 'newlib/libc/stdlib/rand.c')
| -rw-r--r-- | newlib/libc/stdlib/rand.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/newlib/libc/stdlib/rand.c b/newlib/libc/stdlib/rand.c index 3d739efbc..4cf7f2932 100644 --- a/newlib/libc/stdlib/rand.c +++ b/newlib/libc/stdlib/rand.c @@ -78,9 +78,12 @@ _DEFUN (srand, (seed), unsigned int seed) int _DEFUN_VOID (rand) { - return ((_REENT->_new._reent._rand_next = - _REENT->_new._reent._rand_next * 1103515245 + 12345 ) - & RAND_MAX ); + /* This multiplier was obtained from Knuth, D.E., "The Art of + Computer Programming," Vol 2, Seminumerical Algorithms, Third + Edition, Addison-Wesley, 1998, p. 106 (line 26) & p. 108 */ + _REENT->_new._reent._rand_next = + _REENT->_new._reent._rand_next * 6364136223846793005LL + 1; + return (int)((_REENT->_new._reent._rand_next >> 32) & RAND_MAX); } #endif /* _REENT_ONLY */ |