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/* $Id: bs3-cmn-MemMove.c $ */
/** @file
* BS3Kit - Bs3MemMove
*/
/*
* Copyright (C) 2007-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
#include "bs3kit-template-header.h"
#undef Bs3MemMove
BS3_CMN_DEF(void BS3_FAR *, Bs3MemMove,(void BS3_FAR *pvDst, const void BS3_FAR *pvSrc, size_t cbToCopy))
{
size_t cLargeRounds;
BS3CVPTRUNION uSrc;
BS3PTRUNION uDst;
uSrc.pv = pvSrc;
uDst.pv = pvDst;
/* We don't care about segment wrapping here. */
if ((uintptr_t)pvDst > (uintptr_t)pvSrc + cbToCopy)
{
/* Reverse copy. */
uSrc.pb += cbToCopy;
uDst.pb += cbToCopy;
cLargeRounds = cbToCopy / sizeof(*uSrc.pcb);
while (cLargeRounds-- > 0)
{
size_t uTmp = *--uSrc.pcb;
*--uDst.pcb = uTmp;
}
cbToCopy %= sizeof(*uSrc.pcb);
while (cbToCopy-- > 0)
{
uint8_t b = *--uSrc.pb;
*--uDst.pb = b;
}
}
else
{
/* Forward copy. */
cLargeRounds = cbToCopy / sizeof(*uSrc.pcb);
while (cLargeRounds-- > 0)
{
size_t uTmp = *uSrc.pcb++;
*uDst.pcb++ = uTmp;
}
cbToCopy %= sizeof(*uSrc.pcb);
while (cbToCopy-- > 0)
{
uint8_t b = *uSrc.pb++;
*uDst.pb++ = b;
}
}
return pvDst;
}
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