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