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ffs
===

Syntax
------

     #include <string.h>
     
     int ffs(int _mask);

Description
-----------

This function find the first (least significant) bit set in the input
value.

Return Value
------------

Bit position (1..32) of the least significant set bit, or zero if the
input value is zero.

Example
-------

     ffs(0) = 0
     ffs(1) = 1
     ffs(5) = 1
     ffs(96) = 6