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Annotation of sys/lib/libkern/memcmp.c, Revision 1.1

1.1     ! nbrk        1: /*     $OpenBSD: memcmp.c,v 1.4 2004/08/07 00:38:32 deraadt Exp $      */
        !             2:
        !             3: /*-
        !             4:  * Copyright (c) 1990 The Regents of the University of California.
        !             5:  * All rights reserved.
        !             6:  *
        !             7:  * This code is derived from software contributed to Berkeley by
        !             8:  * Chris Torek.
        !             9:  *
        !            10:  * Redistribution and use in source and binary forms, with or without
        !            11:  * modification, are permitted provided that the following conditions
        !            12:  * are met:
        !            13:  * 1. Redistributions of source code must retain the above copyright
        !            14:  *    notice, this list of conditions and the following disclaimer.
        !            15:  * 2. Redistributions in binary form must reproduce the above copyright
        !            16:  *    notice, this list of conditions and the following disclaimer in the
        !            17:  *    documentation and/or other materials provided with the distribution.
        !            18:  * 3. Neither the name of the University nor the names of its contributors
        !            19:  *    may be used to endorse or promote products derived from this software
        !            20:  *    without specific prior written permission.
        !            21:  *
        !            22:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            23:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            24:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            25:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            26:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            27:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            28:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            29:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            30:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            31:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            32:  * SUCH DAMAGE.
        !            33:  */
        !            34:
        !            35: #if defined(LIBC_SCCS) && !defined(lint)
        !            36: static char *rcsid = "$OpenBSD: memcmp.c,v 1.4 2004/08/07 00:38:32 deraadt Exp $";
        !            37: #endif /* LIBC_SCCS and not lint */
        !            38:
        !            39: #if !defined(_KERNEL) && !defined(_STANDALONE)
        !            40: #include <string.h>
        !            41: #else
        !            42: #include <lib/libkern/libkern.h>
        !            43: #endif
        !            44:
        !            45: /*
        !            46:  * Compare memory regions.
        !            47:  */
        !            48: int
        !            49: memcmp(const void *s1, const void *s2, size_t n)
        !            50: {
        !            51:        if (n != 0) {
        !            52:                const unsigned char *p1 = s1, *p2 = s2;
        !            53:
        !            54:                do {
        !            55:                        if (*p1++ != *p2++)
        !            56:                                return (*--p1 - *--p2);
        !            57:                } while (--n != 0);
        !            58:        }
        !            59:        return (0);
        !            60: }