netbsd man page for ffs

Query: ffs

OS: netbsd

Section: 3

Format: Original Unix Latex Style Formatted with HTML and a Horizontal Scroll Bar

FFS(3)							   BSD Library Functions Manual 						    FFS(3)

NAME
ffs -- find first bit set in a bit string
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <strings.h> int ffs(int value);
DESCRIPTION
The ffs() function finds the first bit set in value and returns the index of that bit. Bits are numbered starting from 1, starting at the right-most bit. A return value of 0 means that the argument was zero.
SEE ALSO
bitstring(3), ffs32(3), popcount(3)
STANDARDS
The ffs() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
HISTORY
The ffs() function appeared in 4.3BSD. The prototype for it existed previously in the <string.h> header before it was moved to <strings.h> for POSIX compliance.
BSD
April 28, 2010 BSD
Related Man Pages
ffsl(3) - linux
ffs(3) - debian
ffs(3) - centos
ffsll(3) - suse
ffsl(3) - suse
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