1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* Copyright (c) 1988 AT&T */ 28 /* All Rights Reserved */ 29 30 #pragma ident "%Z%%M% %I% %E% SMI" 31 32 #if !defined(_KMDB) && !defined(_BOOT) && !defined(_KERNEL) 33 34 #pragma weak _memcmp = memcmp 35 36 #include "lint.h" 37 #endif /* !_KMDB && !_BOOT && !_KERNEL */ 38 39 #include <sys/types.h> 40 #if defined(_KERNEL) 41 #include <sys/systm.h> 42 #else 43 #include <string.h> 44 #include <stddef.h> 45 #endif 46 47 /* 48 * Compare n bytes: s1>s2: >0 s1==s2: 0 s1<s2: <0 49 */ 50 int 51 memcmp(const void *s1, const void *s2, size_t n) 52 { 53 if (s1 != s2 && n != 0) { 54 const unsigned char *ps1 = s1; 55 const unsigned char *ps2 = s2; 56 57 do { 58 if (*ps1++ != *ps2++) 59 return (ps1[-1] - ps2[-1]); 60 } while (--n != 0); 61 } 62 63 return (0); 64 } 65