FFS(3) Linux Programmer's Manual FFS(3)
NAME
ffs - find first bit set in a word
SYNOPSIS
#include <strings.h>
int ffs(int i);
DESCRIPTION
The ffs() function returns the position of the first bit set in the word i. The least significant bit is position 1 and the most signifi-
cant position e.g. 32 or 64.
RETURN VALUE
The ffs() function returns the position of the first bit set, or 0 if no bits are set.
CONFORMING TO
BSD 4.3, POSIX 1003.1-2001.
NOTES
BSD systems have a prototype in <string.h>.
GNU
2001-12-20 FFS(3)
