usr/src/lib/libc/string/ffs.3

.\" Copyright (c) 1990 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek.
.\"
.\" %sccs.include.redist.man%
.\"
.\"     @(#)ffs.3       5.1 (Berkeley) %G%
.\"
.TH FFS 3  ""
.UC 7
.SH NAME
ffs \- find first bit set in a bit string
.SH SYNOPSIS
.nf
.ft B
#include <string.h>

int
ffs(int value);
.ft R
.fi
.SH DESCRIPTION
.B Ffs
finds the first bit set in
.I value
and returns the index of that bit.
Bits are numbered starting from 1, starting at the right-most
bit.
A return value of 0 means that the argument was zero.
.SH SEE\ ALSO
bitstring(3)