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ffs(3c) [opensolaris man page]

ffs(3C) 						   Standard C Library Functions 						   ffs(3C)

NAME
ffs - find first set bit SYNOPSIS
#include <strings.h> int ffs(const int i); DESCRIPTION
The ffs() function finds the first bit set (beginning with the least significant bit) and returns the index of that bit. Bits are numbered starting at one (the least significant bit). RETURN VALUES
The ffs() function returns the index of the first bit set. If i is 0, then ffs() returns 0. ERRORS
No errors are defined. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |Standard | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5), standards(5) SunOS 5.11 24 Jul 2002 ffs(3C)

Check Out this Related Man Page

FFS(3)							     Linux Programmer's Manual							    FFS(3)

NAME
ffs, ffsl, ffsll - find first bit set in a word SYNOPSIS
#include <strings.h> int ffs(int i); #include <string.h> int ffsl(long int i); int ffsll(long long int 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 since 2.19: */ _DEFAULT_SOURCE || /* Glibc versions <= 2.19: */ _BSD_SOURCE || _SVID_SOURCE Before glibc 2.12: none ffsl(), ffsll(): Since glibc 2.27: _DEFAULT_SOURCE Before glibc 2.27: _GNU_SOURCE DESCRIPTION
The 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 VALUE
These functions return the position of the first bit set, or 0 if no bits are set in i. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +-----------------------+---------------+---------+ |Interface | Attribute | Value | +-----------------------+---------------+---------+ |ffs(), ffsl(), ffsll() | Thread safety | MT-Safe | +-----------------------+---------------+---------+ CONFORMING TO
ffs(): POSIX.1-2001, POSIX.1-2008, 4.3BSD. The ffsl() and ffsll() functions are glibc extensions. NOTES
BSD systems have a prototype in <string.h>. SEE ALSO
memchr(3) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. GNU
2017-09-15 FFS(3)
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