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fls (3)

>> fls (3) ( FreeBSD man: Библиотечные вызовы )

BSD mandoc

NAME



ffs

 
ffsl

 
ffsll

 
fls

 
flsl

 
flsll

 - find first or last bit set in a bit string

LIBRARY

Lb libc

SYNOPSIS

#include <strings.h>
int ffs (int value);
int ffsl (long value);
int int ffsll (long long value);
fls (int value);
int flsl (long value);
int flsll (long long value);

DESCRIPTION

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

The fls (,);
flsl ();
and flsll ();
functions find the last bit set in Fa 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.

HISTORY

The ffs ();
function appeared in BSD 4.3 Its prototype existed previously in #include <string.h>
before it was moved to #include <strings.h>
for St -p1003.1-2001 compliance.

The ffsl (,);
fls ();
and flsl ();
functions appeared in Fx 5.3 . The ffsll ();
and flsll ();
functions appeared in Fx 8.0 .

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Created 1996-2024 by Maxim Chirkov
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