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| /*
| * 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);
|
|
