xref: /illumos-gate/usr/src/common/util/memcpy.c (revision 82333da9)
17c478bd9Sstevel@tonic-gate /*
27c478bd9Sstevel@tonic-gate  * CDDL HEADER START
37c478bd9Sstevel@tonic-gate  *
47c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
57fad02eeSpetede  * Common Development and Distribution License (the "License").
67fad02eeSpetede  * You may not use this file except in compliance with the License.
77c478bd9Sstevel@tonic-gate  *
87c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
97c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
107c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
117c478bd9Sstevel@tonic-gate  * and limitations under the License.
127c478bd9Sstevel@tonic-gate  *
137c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
147c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
157c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
167c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
177c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
187c478bd9Sstevel@tonic-gate  *
197c478bd9Sstevel@tonic-gate  * CDDL HEADER END
207c478bd9Sstevel@tonic-gate  */
218cd45542Sraf 
227c478bd9Sstevel@tonic-gate /*
23*82333da9SSurya Prakki  * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
247c478bd9Sstevel@tonic-gate  */
257c478bd9Sstevel@tonic-gate 
267c478bd9Sstevel@tonic-gate /*	Copyright (c) 1988 AT&T	*/
277c478bd9Sstevel@tonic-gate /*	  All Rights Reserved  	*/
287c478bd9Sstevel@tonic-gate 
297c478bd9Sstevel@tonic-gate #if !defined(_KMDB) && !defined(_BOOT) && !defined(_KERNEL)
307c478bd9Sstevel@tonic-gate 
317257d1b4Sraf #include "lint.h"
327c478bd9Sstevel@tonic-gate 
337257d1b4Sraf #endif /* !_KMDB && !_BOOT && !_KERNEL */
347fad02eeSpetede 
35*82333da9SSurya Prakki /*
36*82333da9SSurya Prakki  * The SunStudio compiler may generate calls to _memcpy; So we
37*82333da9SSurya Prakki  * need to make sure that the correct symbol exists for these calls.
38*82333da9SSurya Prakki  */
397fad02eeSpetede #pragma weak _memcpy = memcpy
407fad02eeSpetede 
417c478bd9Sstevel@tonic-gate #include <sys/types.h>
427c478bd9Sstevel@tonic-gate 
437c478bd9Sstevel@tonic-gate #if defined(_KERNEL)
447c478bd9Sstevel@tonic-gate #include <sys/systm.h>
45ae115bc7Smrj #elif !defined(_BOOT)
467c478bd9Sstevel@tonic-gate #include <stddef.h>
477c478bd9Sstevel@tonic-gate #include <string.h>
48ae115bc7Smrj #endif
49ae115bc7Smrj 
50ae115bc7Smrj #include "memcpy.h"
517c478bd9Sstevel@tonic-gate 
527c478bd9Sstevel@tonic-gate /*
537c478bd9Sstevel@tonic-gate  * Copy s0 to s, always copy n bytes.
547c478bd9Sstevel@tonic-gate  * Return s
557c478bd9Sstevel@tonic-gate  */
567c478bd9Sstevel@tonic-gate void *
memcpy(void * s,const void * s0,size_t n)577c478bd9Sstevel@tonic-gate memcpy(void *s, const void *s0, size_t n)
587c478bd9Sstevel@tonic-gate {
597c478bd9Sstevel@tonic-gate 	if (n != 0) {
607c478bd9Sstevel@tonic-gate 		char *s1 = s;
617c478bd9Sstevel@tonic-gate 		const char *s2 = s0;
627c478bd9Sstevel@tonic-gate 
637c478bd9Sstevel@tonic-gate 		do {
647c478bd9Sstevel@tonic-gate 			*s1++ = *s2++;
657c478bd9Sstevel@tonic-gate 		} while (--n != 0);
667c478bd9Sstevel@tonic-gate 	}
677c478bd9Sstevel@tonic-gate 	return (s);
687c478bd9Sstevel@tonic-gate }
69