redhat man page for ffs

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)