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/* $Id: kHlpMemMove.c 29 2009-07-01 20:30:29Z bird $ */
/** @file
* kHlpString - kHlpMemMove.
*/
/*
* Copyright (c) 2006-2007 Knut St. Osmundsen <bird-kStuff-spamix@anduin.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include <k/kHlpString.h>
KHLP_DECL(void *) kHlpMemMove(void *pv1, const void *pv2, KSIZE cb)
{
union
{
void *pv;
KU8 *pb;
KUPTR *pu;
} u1;
union
{
const void *pv;
volatile KU8 *pb;
volatile KUPTR *pu;
} u2;
u1.pv = pv1;
u2.pv = pv2;
if ((KUPTR)u1.pb <= (KUPTR)u2.pb)
{
/* forward copy */
if (cb >= 32)
{
while (cb > sizeof(KUPTR))
{
KUPTR u = *u2.pu++;
*u1.pu++ = u;
cb -= sizeof(KUPTR);
}
}
while (cb-- > 0)
{
KU8 b = *u2.pb++;
*u1.pb++ = b;
}
}
else
{
/* backwards copy */
u1.pb += cb;
u2.pb += cb;
if (cb >= 32)
{
while (cb > sizeof(KUPTR))
{
KUPTR u = *--u2.pu;
*--u1.pu = u;
cb -= sizeof(KUPTR);
}
}
while (cb-- > 0)
{
KU8 b = *--u2.pb;
*--u1.pb = b;
}
}
return pv1;
}
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