diff options
Diffstat (limited to 'lib/libc/string/fls.c')
| -rw-r--r-- | lib/libc/string/fls.c | 16 |
1 files changed, 6 insertions, 10 deletions
diff --git a/lib/libc/string/fls.c b/lib/libc/string/fls.c index d9edc41f9599..ac5fb7738722 100644 --- a/lib/libc/string/fls.c +++ b/lib/libc/string/fls.c @@ -3,6 +3,10 @@ * * Copyright (c) 1990, 1993 * The Regents of the University of California. All rights reserved. + * Copyright (c) 2023 The FreeBSD Foundation + * + * Portions of this software were developed by Robert Clausecker + * <fuz@FreeBSD.org> under sponsorship from the FreeBSD Foundation. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions @@ -29,9 +33,7 @@ * SUCH DAMAGE. */ -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - +#include <limits.h> #include <strings.h> /* @@ -40,11 +42,5 @@ __FBSDID("$FreeBSD$"); int fls(int mask) { - int bit; - - if (mask == 0) - return (0); - for (bit = 1; mask != 1; bit++) - mask = (unsigned int)mask >> 1; - return (bit); + return (mask == 0 ? 0 : CHAR_BIT * sizeof(mask) - __builtin_clz(mask)); } |