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FFS (3) | C library functions | Unix Manual Pages | :man

NAME

ffs, ffsl, fls, flsl - find first or last bit set in a bit string

CONTENTS

Library
Synopsis
Description
See Also
History

LIBRARY


.Lb libc

SYNOPSIS


.In strings.h int ffs "int value" int ffsl "long value" int fls "int value" int flsl "long value"

DESCRIPTION

The ffs and ffsl functions find the first bit set in value and return the index of that bit.

The fls and flsl functions find the last bit set in value and return the index of that bit.

Bits are numbered starting from 1, starting at the right-most (least significant) bit. A return value of zero from any of these functions means that the argument was zero.

SEE ALSO

bitstring(3)

HISTORY


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