1*716024cdSPeter Avalos /*- 2*716024cdSPeter Avalos * Copyright (c) 1990, 1993 3*716024cdSPeter Avalos * The Regents of the University of California. All rights reserved. 4*716024cdSPeter Avalos * 5*716024cdSPeter Avalos * Redistribution and use in source and binary forms, with or without 6*716024cdSPeter Avalos * modification, are permitted provided that the following conditions 7*716024cdSPeter Avalos * are met: 8*716024cdSPeter Avalos * 1. Redistributions of source code must retain the above copyright 9*716024cdSPeter Avalos * notice, this list of conditions and the following disclaimer. 10*716024cdSPeter Avalos * 2. Redistributions in binary form must reproduce the above copyright 11*716024cdSPeter Avalos * notice, this list of conditions and the following disclaimer in the 12*716024cdSPeter Avalos * documentation and/or other materials provided with the distribution. 13*716024cdSPeter Avalos * 4. Neither the name of the University nor the names of its contributors 14*716024cdSPeter Avalos * may be used to endorse or promote products derived from this software 15*716024cdSPeter Avalos * without specific prior written permission. 16*716024cdSPeter Avalos * 17*716024cdSPeter Avalos * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18*716024cdSPeter Avalos * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19*716024cdSPeter Avalos * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20*716024cdSPeter Avalos * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21*716024cdSPeter Avalos * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22*716024cdSPeter Avalos * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23*716024cdSPeter Avalos * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24*716024cdSPeter Avalos * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25*716024cdSPeter Avalos * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26*716024cdSPeter Avalos * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27*716024cdSPeter Avalos * SUCH DAMAGE. 28*716024cdSPeter Avalos * 29*716024cdSPeter Avalos * $FreeBSD: src/lib/libc/string/flsl.c,v 1.3 2007/01/09 00:28:12 imp Exp $ 30*716024cdSPeter Avalos */ 31*716024cdSPeter Avalos 32*716024cdSPeter Avalos #include <strings.h> 33*716024cdSPeter Avalos 34*716024cdSPeter Avalos /* 35*716024cdSPeter Avalos * Find Last Set bit 36*716024cdSPeter Avalos */ 37*716024cdSPeter Avalos int 38*716024cdSPeter Avalos flsl(long mask) 39*716024cdSPeter Avalos { 40*716024cdSPeter Avalos int bit; 41*716024cdSPeter Avalos 42*716024cdSPeter Avalos if (mask == 0) 43*716024cdSPeter Avalos return (0); 44*716024cdSPeter Avalos for (bit = 1; mask != 1; bit++) 45*716024cdSPeter Avalos mask = (unsigned long)mask >> 1; 46*716024cdSPeter Avalos return (bit); 47*716024cdSPeter Avalos } 48