@node ffs, string
@subheading Syntax

@example
#include <string.h>

int ffs(int _mask);
@end example

@subheading Description

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

@subheading Return Value

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

@subheading Portability

@portability !ansi, !posix

@subheading Example

@example
ffs(0) = 0
ffs(1) = 1
ffs(5) = 1
ffs(96) = 6
@end example