db_log2.c

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00001 /*-
00002  * See the file LICENSE for redistribution information.
00003  *
00004  * Copyright (c) 1996, 1997, 1998, 1999, 2000
00005  *      Sleepycat Software.  All rights reserved.
00006  */
00007 /*
00008  * Copyright (c) 1995, 1996
00009  *      The Regents of the University of California.  All rights reserved.
00010  *
00011  * This code is derived from software contributed to Berkeley by
00012  * Margo Seltzer.
00013  *
00014  * Redistribution and use in source and binary forms, with or without
00015  * modification, are permitted provided that the following conditions
00016  * are met:
00017  * 1. Redistributions of source code must retain the above copyright
00018  *    notice, this list of conditions and the following disclaimer.
00019  * 2. Redistributions in binary form must reproduce the above copyright
00020  *    notice, this list of conditions and the following disclaimer in the
00021  *    documentation and/or other materials provided with the distribution.
00022  * 3. Neither the name of the University nor the names of its contributors
00023  *    may be used to endorse or promote products derived from this software
00024  *    without specific prior written permission.
00025  *
00026  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00027  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00028  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00029  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00030  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00031  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00032  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00033  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00034  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00035  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00036  * SUCH DAMAGE.
00037  */
00038 
00039 #include "config.h"
00040 
00041 #ifndef lint
00042 static const char revid[] = "$Id: db__log2_8c-source.html,v 1.1 2008/06/08 10:17:51 sebdiaz Exp $";
00043 #endif /* not lint */
00044 
00045 #ifndef NO_SYSTEM_INCLUDES
00046 #include <sys/types.h>
00047 #endif
00048 
00049 #include "db_int.h"
00050 #include "common_ext.h"
00051 
00052 /*
00053  * PUBLIC: u_int32_t CDB___db_log2 __P((u_int32_t));
00054  */
00055 u_int32_t
00056 CDB___db_log2(num)
00057         u_int32_t num;
00058 {
00059         u_int32_t i, limit;
00060 
00061         limit = 1;
00062         for (i = 0; limit < num; limit = limit << 1)
00063                 ++i;
00064         return (i);
00065 }

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