diff options
| -rw-r--r-- | arc4random.c | 13 |
1 files changed, 2 insertions, 11 deletions
diff --git a/arc4random.c b/arc4random.c index b3ec7655..21a12755 100644 --- a/arc4random.c +++ b/arc4random.c @@ -506,17 +506,8 @@ arc4random_uniform(unsigned int upper_bound) if (upper_bound < 2) return 0; -#if (UINT_MAX > 0xffffffffUL) - min = 0x100000000UL % upper_bound; -#else - /* Calculate (2**32 % upper_bound) avoiding 64-bit math */ - if (upper_bound > 0x80000000) - min = 1 + ~upper_bound; /* 2**32 - upper_bound */ - else { - /* (2**32 - (x * 2)) % x == 2**32 % x when x <= 2**31 */ - min = ((0xffffffff - (upper_bound * 2)) + 1) % upper_bound; - } -#endif + /* 2**32 % x == (2**32 - x) % x */ + min = -upper_bound % upper_bound; /* * This could theoretically loop forever but each retry has |