memcmp2.c

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00001 /*-
00002  * See the file LICENSE for redistribution information.
00003  *
00004  * Copyright (c) 1996, 1997, 1998, 1999
00005  *      Sleepycat Software.  All rights reserved.
00006  */
00007 /*
00008  * Copyright (c) 1990, 1993
00009  *      The Regents of the University of California.  All rights reserved.
00010  *
00011  * Redistribution and use in source and binary forms, with or without
00012  * modification, are permitted provided that the following conditions
00013  * are met:
00014  * 1. Redistributions of source code must retain the above copyright
00015  *    notice, this list of conditions and the following disclaimer.
00016  * 2. Redistributions in binary form must reproduce the above copyright
00017  *    notice, this list of conditions and the following disclaimer in the
00018  *    documentation and/or other materials provided with the distribution.
00019  * 3. Neither the name of the University nor the names of its contributors
00020  *    may be used to endorse or promote products derived from this software
00021  *    without specific prior written permission.
00022  *
00023  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
00024  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00025  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
00026  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
00027  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00028  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
00029  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
00030  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
00031  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
00032  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00033  * SUCH DAMAGE.
00034  */
00035 
00036 #ifdef HAVE_CONFIG_H
00037 #include "config.h"
00038 #endif /* HAVE_CONFIG_H */
00039 
00040 #include <sys/types.h>
00041 
00042 #ifndef HAVE_MEMCMP
00043 /*
00044  * memcmp --
00045  *
00046  * PUBLIC: #ifndef HAVE_MEMCMP
00047  * PUBLIC: int memcmp __P((const void *, const void *, size_t));
00048  * PUBLIC: #endif
00049  */
00050 int
00051 memcmp(s1, s2, n)
00052         char *s1, *s2;
00053         size_t n;
00054 {
00055         if (n != 0) {
00056                 unsigned char *p1 = (unsigned char *)s1,
00057                               *p2 = (unsigned char *)s2;
00058                 do {
00059                         if (*p1++ != *p2++)
00060                                 return (*--p1 - *--p2);
00061                 } while (--n != 0);
00062         }
00063         return (0);
00064 }
00065 #endif /* HAVE_MEMCMP */

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