1*4a5d661aSToomas Soome /*- 2*4a5d661aSToomas Soome * Copyright (c) 1990, 1993 3*4a5d661aSToomas Soome * The Regents of the University of California. All rights reserved. 4*4a5d661aSToomas Soome * 5*4a5d661aSToomas Soome * Redistribution and use in source and binary forms, with or without 6*4a5d661aSToomas Soome * modification, are permitted provided that the following conditions 7*4a5d661aSToomas Soome * are met: 8*4a5d661aSToomas Soome * 1. Redistributions of source code must retain the above copyright 9*4a5d661aSToomas Soome * notice, this list of conditions and the following disclaimer. 10*4a5d661aSToomas Soome * 2. Redistributions in binary form must reproduce the above copyright 11*4a5d661aSToomas Soome * notice, this list of conditions and the following disclaimer in the 12*4a5d661aSToomas Soome * documentation and/or other materials provided with the distribution. 13*4a5d661aSToomas Soome * 3. Neither the name of the University nor the names of its contributors 14*4a5d661aSToomas Soome * may be used to endorse or promote products derived from this software 15*4a5d661aSToomas Soome * without specific prior written permission. 16*4a5d661aSToomas Soome * 17*4a5d661aSToomas Soome * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18*4a5d661aSToomas Soome * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19*4a5d661aSToomas Soome * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20*4a5d661aSToomas Soome * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21*4a5d661aSToomas Soome * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22*4a5d661aSToomas Soome * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23*4a5d661aSToomas Soome * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24*4a5d661aSToomas Soome * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25*4a5d661aSToomas Soome * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26*4a5d661aSToomas Soome * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27*4a5d661aSToomas Soome * SUCH DAMAGE. 28*4a5d661aSToomas Soome */ 29*4a5d661aSToomas Soome 30*4a5d661aSToomas Soome #include <sys/cdefs.h> 31*4a5d661aSToomas Soome __FBSDID("$FreeBSD$"); 32*4a5d661aSToomas Soome 33*4a5d661aSToomas Soome #include <strings.h> 34*4a5d661aSToomas Soome 35*4a5d661aSToomas Soome /* 36*4a5d661aSToomas Soome * Find Last Set bit 37*4a5d661aSToomas Soome */ 38*4a5d661aSToomas Soome int 39*4a5d661aSToomas Soome fls(int mask) 40*4a5d661aSToomas Soome { 41*4a5d661aSToomas Soome int bit; 42*4a5d661aSToomas Soome 43*4a5d661aSToomas Soome if (mask == 0) 44*4a5d661aSToomas Soome return (0); 45*4a5d661aSToomas Soome for (bit = 1; mask != 1; bit++) 46*4a5d661aSToomas Soome mask = (unsigned int)mask >> 1; 47*4a5d661aSToomas Soome return (bit); 48*4a5d661aSToomas Soome } 49