VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/bootsectors/bs3kit/bs3-cmn-MemMove.c@ 66316

Last change on this file since 66316 was 62484, checked in by vboxsync, 8 years ago

(C) 2016

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
File size: 2.2 KB
Line 
1/* $Id: bs3-cmn-MemMove.c 62484 2016-07-22 18:35:33Z vboxsync $ */
2/** @file
3 * BS3Kit - Bs3MemMove
4 */
5
6/*
7 * Copyright (C) 2007-2016 Oracle Corporation
8 *
9 * This file is part of VirtualBox Open Source Edition (OSE), as
10 * available from http://www.virtualbox.org. This file is free software;
11 * you can redistribute it and/or modify it under the terms of the GNU
12 * General Public License (GPL) as published by the Free Software
13 * Foundation, in version 2 as it comes in the "COPYING" file of the
14 * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15 * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16 *
17 * The contents of this file may alternatively be used under the terms
18 * of the Common Development and Distribution License Version 1.0
19 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20 * VirtualBox OSE distribution, in which case the provisions of the
21 * CDDL are applicable instead of those of the GPL.
22 *
23 * You may elect to license modified versions of this file under the
24 * terms and conditions of either the GPL or the CDDL or both.
25 */
26
27#include "bs3kit-template-header.h"
28
29#undef Bs3MemMove
30BS3_CMN_DEF(void BS3_FAR *, Bs3MemMove,(void BS3_FAR *pvDst, const void BS3_FAR *pvSrc, size_t cbToCopy))
31{
32 size_t cLargeRounds;
33 BS3CVPTRUNION uSrc;
34 BS3PTRUNION uDst;
35 uSrc.pv = pvSrc;
36 uDst.pv = pvDst;
37
38 /* We don't care about segment wrapping here. */
39 if ((uintptr_t)pvDst > (uintptr_t)pvSrc + cbToCopy)
40 {
41 /* Reverse copy. */
42 uSrc.pb += cbToCopy;
43 uDst.pb += cbToCopy;
44
45 cLargeRounds = cbToCopy / sizeof(*uSrc.pcb);
46 while (cLargeRounds-- > 0)
47 {
48 size_t uTmp = *--uSrc.pcb;
49 *--uDst.pcb = uTmp;
50 }
51
52 cbToCopy %= sizeof(*uSrc.pcb);
53 while (cbToCopy-- > 0)
54 {
55 uint8_t b = *--uSrc.pb;
56 *--uDst.pb = b;
57 }
58 }
59 else
60 {
61 /* Forward copy. */
62 cLargeRounds = cbToCopy / sizeof(*uSrc.pcb);
63 while (cLargeRounds-- > 0)
64 {
65 size_t uTmp = *uSrc.pcb++;
66 *uDst.pcb++ = uTmp;
67 }
68
69 cbToCopy %= sizeof(*uSrc.pcb);
70 while (cbToCopy-- > 0)
71 {
72 uint8_t b = *uSrc.pb++;
73 *uDst.pb++ = b;
74 }
75 }
76 return pvDst;
77}
78
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