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/* $Id: bs3-cmn-MemMove.c $ */
/** @file
* BS3Kit - Bs3MemMove
*/
/*
* Copyright (C) 2007-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
#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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