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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/m68k/lib/memmove.c
10817 views
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/*

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 * This file is subject to the terms and conditions of the GNU General Public

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 * License.  See the file COPYING in the main directory of this archive

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 * for more details.

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 */

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#include <linux/module.h>

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#include <linux/string.h>

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void *memmove(void *dest, const void *src, size_t n)

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{

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	void *xdest = dest;

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	size_t temp;

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	if (!n)

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		return xdest;

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	if (dest < src) {

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		if ((long)dest & 1) {

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			char *cdest = dest;

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			const char *csrc = src;

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			*cdest++ = *csrc++;

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			dest = cdest;

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			src = csrc;

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			n--;

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		}

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		if (n > 2 && (long)dest & 2) {

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			short *sdest = dest;

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			const short *ssrc = src;

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			*sdest++ = *ssrc++;

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			dest = sdest;

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			src = ssrc;

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			n -= 2;

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		}

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		temp = n >> 2;

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		if (temp) {

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			long *ldest = dest;

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			const long *lsrc = src;

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			temp--;

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			do

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				*ldest++ = *lsrc++;

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			while (temp--);

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			dest = ldest;

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			src = lsrc;

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		}

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		if (n & 2) {

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			short *sdest = dest;

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			const short *ssrc = src;

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			*sdest++ = *ssrc++;

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			dest = sdest;

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			src = ssrc;

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		}

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		if (n & 1) {

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			char *cdest = dest;

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			const char *csrc = src;

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			*cdest = *csrc;

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		}

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	} else {

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		dest = (char *)dest + n;

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		src = (const char *)src + n;

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		if ((long)dest & 1) {

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			char *cdest = dest;

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			const char *csrc = src;

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			*--cdest = *--csrc;

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			dest = cdest;

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			src = csrc;

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			n--;

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		}

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		if (n > 2 && (long)dest & 2) {

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			short *sdest = dest;

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			const short *ssrc = src;

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			*--sdest = *--ssrc;

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			dest = sdest;

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			src = ssrc;

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			n -= 2;

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		}

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		temp = n >> 2;

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		if (temp) {

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			long *ldest = dest;

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			const long *lsrc = src;

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			temp--;

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			do

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				*--ldest = *--lsrc;

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			while (temp--);

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			dest = ldest;

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			src = lsrc;

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		}

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		if (n & 2) {

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			short *sdest = dest;

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			const short *ssrc = src;

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			*--sdest = *--ssrc;

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			dest = sdest;

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			src = ssrc;

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		}

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		if (n & 1) {

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			char *cdest = dest;

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			const char *csrc = src;

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			*--cdest = *--csrc;

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		}

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	}

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	return xdest;

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}

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EXPORT_SYMBOL(memmove);

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