mirror of
https://github.com/torvalds/linux.git
synced 2024-11-10 14:11:52 +00:00
80160de89d
Merging the mmu and non-mmu directories we ended up with duplicate (and identical) implementations of memmove(). Remove one of them. Signed-off-by: Greg Ungerer <gerg@uclinux.org> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
104 lines
1.8 KiB
C
104 lines
1.8 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file COPYING in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
|
|
void *memmove(void *dest, const void *src, size_t n)
|
|
{
|
|
void *xdest = dest;
|
|
size_t temp;
|
|
|
|
if (!n)
|
|
return xdest;
|
|
|
|
if (dest < src) {
|
|
if ((long)dest & 1) {
|
|
char *cdest = dest;
|
|
const char *csrc = src;
|
|
*cdest++ = *csrc++;
|
|
dest = cdest;
|
|
src = csrc;
|
|
n--;
|
|
}
|
|
if (n > 2 && (long)dest & 2) {
|
|
short *sdest = dest;
|
|
const short *ssrc = src;
|
|
*sdest++ = *ssrc++;
|
|
dest = sdest;
|
|
src = ssrc;
|
|
n -= 2;
|
|
}
|
|
temp = n >> 2;
|
|
if (temp) {
|
|
long *ldest = dest;
|
|
const long *lsrc = src;
|
|
temp--;
|
|
do
|
|
*ldest++ = *lsrc++;
|
|
while (temp--);
|
|
dest = ldest;
|
|
src = lsrc;
|
|
}
|
|
if (n & 2) {
|
|
short *sdest = dest;
|
|
const short *ssrc = src;
|
|
*sdest++ = *ssrc++;
|
|
dest = sdest;
|
|
src = ssrc;
|
|
}
|
|
if (n & 1) {
|
|
char *cdest = dest;
|
|
const char *csrc = src;
|
|
*cdest = *csrc;
|
|
}
|
|
} else {
|
|
dest = (char *)dest + n;
|
|
src = (const char *)src + n;
|
|
if ((long)dest & 1) {
|
|
char *cdest = dest;
|
|
const char *csrc = src;
|
|
*--cdest = *--csrc;
|
|
dest = cdest;
|
|
src = csrc;
|
|
n--;
|
|
}
|
|
if (n > 2 && (long)dest & 2) {
|
|
short *sdest = dest;
|
|
const short *ssrc = src;
|
|
*--sdest = *--ssrc;
|
|
dest = sdest;
|
|
src = ssrc;
|
|
n -= 2;
|
|
}
|
|
temp = n >> 2;
|
|
if (temp) {
|
|
long *ldest = dest;
|
|
const long *lsrc = src;
|
|
temp--;
|
|
do
|
|
*--ldest = *--lsrc;
|
|
while (temp--);
|
|
dest = ldest;
|
|
src = lsrc;
|
|
}
|
|
if (n & 2) {
|
|
short *sdest = dest;
|
|
const short *ssrc = src;
|
|
*--sdest = *--ssrc;
|
|
dest = sdest;
|
|
src = ssrc;
|
|
}
|
|
if (n & 1) {
|
|
char *cdest = dest;
|
|
const char *csrc = src;
|
|
*--cdest = *--csrc;
|
|
}
|
|
}
|
|
return xdest;
|
|
}
|
|
EXPORT_SYMBOL(memmove);
|