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TOMOYO Linux Cross Reference
Linux/arch/m68k/lib/memmove.c

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  1 /*
  2  * This file is subject to the terms and conditions of the GNU General Public
  3  * License.  See the file COPYING in the main directory of this archive
  4  * for more details.
  5  */
  6 
  7 #include <linux/module.h>
  8 #include <linux/string.h>
  9 
 10 void *memmove(void *dest, const void *src, size_t n)
 11 {
 12         void *xdest = dest;
 13         size_t temp;
 14 
 15         if (!n)
 16                 return xdest;
 17 
 18         if (dest < src) {
 19                 if ((long)dest & 1) {
 20                         char *cdest = dest;
 21                         const char *csrc = src;
 22                         *cdest++ = *csrc++;
 23                         dest = cdest;
 24                         src = csrc;
 25                         n--;
 26                 }
 27                 if (n > 2 && (long)dest & 2) {
 28                         short *sdest = dest;
 29                         const short *ssrc = src;
 30                         *sdest++ = *ssrc++;
 31                         dest = sdest;
 32                         src = ssrc;
 33                         n -= 2;
 34                 }
 35                 temp = n >> 2;
 36                 if (temp) {
 37                         long *ldest = dest;
 38                         const long *lsrc = src;
 39                         temp--;
 40                         do
 41                                 *ldest++ = *lsrc++;
 42                         while (temp--);
 43                         dest = ldest;
 44                         src = lsrc;
 45                 }
 46                 if (n & 2) {
 47                         short *sdest = dest;
 48                         const short *ssrc = src;
 49                         *sdest++ = *ssrc++;
 50                         dest = sdest;
 51                         src = ssrc;
 52                 }
 53                 if (n & 1) {
 54                         char *cdest = dest;
 55                         const char *csrc = src;
 56                         *cdest = *csrc;
 57                 }
 58         } else {
 59                 dest = (char *)dest + n;
 60                 src = (const char *)src + n;
 61                 if ((long)dest & 1) {
 62                         char *cdest = dest;
 63                         const char *csrc = src;
 64                         *--cdest = *--csrc;
 65                         dest = cdest;
 66                         src = csrc;
 67                         n--;
 68                 }
 69                 if (n > 2 && (long)dest & 2) {
 70                         short *sdest = dest;
 71                         const short *ssrc = src;
 72                         *--sdest = *--ssrc;
 73                         dest = sdest;
 74                         src = ssrc;
 75                         n -= 2;
 76                 }
 77                 temp = n >> 2;
 78                 if (temp) {
 79                         long *ldest = dest;
 80                         const long *lsrc = src;
 81                         temp--;
 82                         do
 83                                 *--ldest = *--lsrc;
 84                         while (temp--);
 85                         dest = ldest;
 86                         src = lsrc;
 87                 }
 88                 if (n & 2) {
 89                         short *sdest = dest;
 90                         const short *ssrc = src;
 91                         *--sdest = *--ssrc;
 92                         dest = sdest;
 93                         src = ssrc;
 94                 }
 95                 if (n & 1) {
 96                         char *cdest = dest;
 97                         const char *csrc = src;
 98                         *--cdest = *--csrc;
 99                 }
100         }
101         return xdest;
102 }
103 EXPORT_SYMBOL(memmove);
104 

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