fls3
Find first or last bit set in a bit string
Part of ffs(3).
Usage
#include <strings.h>
int
ffs(int value);
int
ffsl(long value);
int
ffsll(long long value);
int
fls(int value);
int
flsl(long value);
int
flsll(long long value);
Library
Standard C Library (libc, -lc)
Overview
The ffs(), ffsl() and ffsll() functions find the first (least significant) bit set in value and return the index of that bit.
The fls(), flsl() and flsll() functions find the last (most significant) bit set in value and return the index of that bit.
Bits are numbered starting at 1, the least significant bit. A return value of zero from any of these functions means that the argument was zero.
Releases
52 releases since FreeBSD 5.3-RELEASE; the text changed 36 times.