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Man Pages


Manual Reference Pages  -  FFSL (3)

NAME

ffs, ffsl, ffsll, fls, flsl, flsll - 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 ffsll long long value int fls int value int flsl long value int flsll long long value

DESCRIPTION

The ffs, ffsl and ffsll functions find the first (least significant) bit set in value and return the index of that bit.

The fls, flsl and flsll functions find the last (most significant) bit set in value and return the index of that bit.

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

SEE ALSO

bitstring(3)

HISTORY

The ffs function appeared in BSD 4.3 . Its prototype existed previously in
.In string.h before it was moved to
.In strings.h for -p1003.1-2001 compliance.

The ffsl, fls and flsl functions appeared in
.Fx 5.3 . The ffsll and flsll functions appeared in
.Fx 7.1 .

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