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| FFS(3) | FreeBSD Library Functions Manual | FFS(3) |
NAME
ffs, ffsl,
ffsll, fls,
flsl, flsll —
LIBRARY
Standard C Library (libc, -lc)SYNOPSIS
#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);
DESCRIPTION
Theffs(), 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.
SEE ALSO
bitstring(3), bitset(9)HISTORY
Theffs() function appeared in
4.3BSD. Its prototype existed previously in
<string.h> before it was moved
to <strings.h> for
IEEE Std 1003.1-2001 (“POSIX.1”)
compliance.
The ffsl(), fls()
and flsl() functions appeared in
FreeBSD 5.3. The ffsll() and
flsll() functions appeared in
FreeBSD 7.1.
| October 17, 2015 | FreeBSD 13.1-RELEASE |
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