The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/lib/libkern/ffs.c

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    1 /*      $NetBSD: ffs.c,v 1.10 2003/08/07 16:32:07 agc Exp $     */
    2 
    3 /*-
    4  * Copyright (c) 1990, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  */
   31 
   32 #include <sys/cdefs.h>
   33 #if defined(LIBC_SCCS) && !defined(lint)
   34 #if 0
   35 static char sccsid[] = "@(#)ffs.c       8.1 (Berkeley) 6/4/93";
   36 #else
   37 __RCSID("$NetBSD: ffs.c,v 1.10 2003/08/07 16:32:07 agc Exp $");
   38 #endif
   39 #endif /* LIBC_SCCS and not lint */
   40 
   41 #if !defined(_KERNEL) && !defined(_STANDALONE)
   42 #include <string.h>
   43 #else
   44 #include <lib/libkern/libkern.h>
   45 #endif
   46 
   47 /* #undef ffs() - might be defined as macro to __builtin_ffs() */
   48 #undef ffs
   49 
   50 /*
   51  * ffs - find first bit set in a bit string (C version)
   52  */
   53 int
   54 ffs(mask)
   55         int mask;
   56 {
   57         int bit;
   58 
   59         if (mask == 0)
   60                 return(0);
   61         for (bit = 1; !(mask & 1); bit++)
   62                 mask >>= 1;
   63         return(bit);
   64 }

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