diff options
| author | Andrey A. Chernov <ache@FreeBSD.org> | 2008-07-22 12:43:09 +0000 |
|---|---|---|
| committer | Andrey A. Chernov <ache@FreeBSD.org> | 2008-07-22 12:43:09 +0000 |
| commit | 61d35b63502e09897377780f0db236426da1f997 (patch) | |
| tree | 5ffd58b79b3f9d9258ee560622881668e81198dc /lib/libc/gen/arc4random.c | |
| parent | c0046493c9e8056e8dd7a20c6cf436773eb706fd (diff) | |
Notes
Diffstat (limited to 'lib/libc/gen/arc4random.c')
| -rw-r--r-- | lib/libc/gen/arc4random.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/libc/gen/arc4random.c b/lib/libc/gen/arc4random.c index 1c7dead160a2..56e457b8e9fb 100644 --- a/lib/libc/gen/arc4random.c +++ b/lib/libc/gen/arc4random.c @@ -256,7 +256,11 @@ arc4random_uniform(u_int32_t upper_bound) u_int32_t r, min; if (upper_bound < 2) - return 0; + return (0); + + /* Detect simple power of two case */ + if ((upper_bound & -upper_bound) == upper_bound) + return (arc4random() % upper_bound); #if (ULONG_MAX > 0xffffffffUL) min = 0x100000000UL % upper_bound; |