FFS(3) | Library Functions Manual | FFS(3) |
ffs
— find first
bit set in a bit string
#include
<strings.h>
int
ffs
(int
value);
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 rightmost bit. A return value of 0
means that the argument was zero.
The ffs
() function conforms to
IEEE Std 1003.1-2008 (“POSIX.1”).
The ffs
() function first appeared in
4.2BSD.
August 30, 2019 | OpenBSD-current |