FFS

Section: Linux Programmer's Manual (3 )
Updated: 1993-04-13
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NAME

ffs - find first bit set in a word

SYNOPSIS

#include <string.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 significant position 32.

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, SUSv2

According to SUSv2, this function is defined in <strings.h>.

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