#include <string.h> int ffs(int _mask);
This function find the first (least significant) bit set in the input value.
Bit position (1..32) of the least significant set bit, or zero if the input value is zero.
not ANSI, not POSIX
ffs(0) = 0 ffs(1) = 1 ffs(5) = 1 ffs(96) = 6
Go to the first, previous, next, last section, table of contents.