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982cd252 GU |
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 | ||
982cd252 GU |
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); |