FFS(3) BSD Programmer's Manual FFS(3)NAMEffs - find first bit set in a bit string
SYNOPSIS
#include <string.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 rightmost
bit. A return value of 0 means that the argument was zero.
SEE ALSObitstring(3)HISTORY
The ffs() function appeared in 4.3BSD.
MirOS BSD #10-current April 19, 1991 1