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Command: ffs | Section: 3 | Source: NetBSD | File: ffs.3
FFS(3) FreeBSD Library Functions Manual FFS(3)
NAME
ffs - find first bit set in a bit string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <strings.h>
int
ffs(int value);
DESCRIPTION
The ffs() function finds the first bit set in 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.
SEE ALSO
bitstring(3), ffs32(3), popcount(3)
STANDARDS
The ffs() function conforms to IEEE Std 1003.1-2001 ("POSIX.1").
HISTORY
The ffs() function appeared in 4.3BSD. The prototype for it existed
previously in the <string.h> header before it was moved to <strings.h>
for POSIX compliance.
FreeBSD 14.1-RELEASE-p8 April 28, 2010 FreeBSD 14.1-RELEASE-p8