1199767f8SToomas Soome /*-
2199767f8SToomas Soome * Copyright (c) 1990, 1993
3199767f8SToomas Soome * The Regents of the University of California. All rights reserved.
4199767f8SToomas Soome *
5199767f8SToomas Soome * Redistribution and use in source and binary forms, with or without
6199767f8SToomas Soome * modification, are permitted provided that the following conditions
7199767f8SToomas Soome * are met:
8199767f8SToomas Soome * 1. Redistributions of source code must retain the above copyright
9199767f8SToomas Soome * notice, this list of conditions and the following disclaimer.
10199767f8SToomas Soome * 2. Redistributions in binary form must reproduce the above copyright
11199767f8SToomas Soome * notice, this list of conditions and the following disclaimer in the
12199767f8SToomas Soome * documentation and/or other materials provided with the distribution.
13199767f8SToomas Soome * 3. Neither the name of the University nor the names of its contributors
14199767f8SToomas Soome * may be used to endorse or promote products derived from this software
15199767f8SToomas Soome * without specific prior written permission.
16199767f8SToomas Soome *
17199767f8SToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18199767f8SToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19199767f8SToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20199767f8SToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21199767f8SToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22199767f8SToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23199767f8SToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24199767f8SToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25199767f8SToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26199767f8SToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27199767f8SToomas Soome * SUCH DAMAGE.
28199767f8SToomas Soome */
29199767f8SToomas Soome
30199767f8SToomas Soome #include <sys/cdefs.h>
31199767f8SToomas Soome __FBSDID("$FreeBSD$");
32199767f8SToomas Soome
33199767f8SToomas Soome #include <strings.h>
34199767f8SToomas Soome
35199767f8SToomas Soome /*
36199767f8SToomas Soome * Find Last Set bit
37199767f8SToomas Soome */
38199767f8SToomas Soome int
fls(int mask)39199767f8SToomas Soome fls(int mask)
40199767f8SToomas Soome {
41199767f8SToomas Soome int bit;
42199767f8SToomas Soome
43199767f8SToomas Soome if (mask == 0)
44199767f8SToomas Soome return (0);
45199767f8SToomas Soome for (bit = 1; mask != 1; bit++)
46199767f8SToomas Soome mask = (unsigned int)mask >> 1;
47199767f8SToomas Soome return (bit);
48199767f8SToomas Soome }
49