ffs - Online Linux Manual PageSection : 3
Updated : 2023-02-05
Source : Linux man-pages 6.03
NAMEffs, ffsl, ffsll − find first bit set in a word
LIBRARYStandard C library (libc, −lc)
SYNOPSIS#include <strings.h>int ffs(int i);#include <string.h>int ffsl(long i);
int ffsll(long long i);Feature Test Macro Requirements for glibc (see feature_test_macros(7)): ffs(): Since glibc 2.12:
_XOPEN_SOURCE >= 700
|| ! (_POSIX_C_SOURCE >= 200809L)
|| /* glibc >= 2.19: */ _DEFAULT_SOURCE
|| /* glibc <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE
Before glibc 2.12:
noneffsl(), ffsll(): Since glibc 2.27:
_DEFAULT_SOURCE
Before glibc 2.27:
_GNU_SOURCE
DESCRIPTIONThe ffs() function returns the position of the first (least significant) bit set in the word i. The least significant bit is position 1 and the most significant position is, for example, 32 or 64. The functions ffsll() and ffsl() do the same but take arguments of possibly different size.
RETURN VALUEThese functions return the position of the first bit set, or 0 if no bits are set in i.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7). InterfaceAttributeValue ffs(), ffsl(), ffsll() Thread safetyMT-Safe
STANDARDSffs(): POSIX.1-2001, POSIX.1-2008, 4.3BSD. The ffsl() and ffsll() functions are glibc extensions.
NOTESBSD systems have a prototype in <string.h>.
SEE ALSOmemchr(3) 0
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