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      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(_KERNEL)
     33 
     34 #pragma weak _memmove = memmove
     35 
     36 #include "lint.h"
     37 #endif /* !_KMDB && !_KERNEL */
     38 
     39 #include <sys/types.h>
     40 
     41 #if defined(_KERNEL)
     42 #include <sys/systm.h>
     43 #else
     44 #include <string.h>
     45 #include <memory.h>
     46 #endif
     47 
     48 /*
     49  * Copy s0 to s, always copy n bytes.
     50  * Return s
     51  * Copying between objects that overlap will take place correctly
     52  */
     53 void *
     54 memmove(void *s, const void *s0, size_t n)
     55 {
     56 	if (n != 0) {
     57 		char *s1 = s;
     58 		const char *s2 = s0;
     59 
     60 		if (s1 <= s2) {
     61 			do {
     62 				*s1++ = *s2++;
     63 			} while (--n != 0);
     64 		} else {
     65 			s2 += n;
     66 			s1 += n;
     67 			do {
     68 				*--s1 = *--s2;
     69 			} while (--n != 0);
     70 		}
     71 	}
     72 	return (s);
     73 }
     74