]>
Commit | Line | Data |
---|---|---|
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 | #define __IN_STRING_C | |
8 | ||
9 | #include <linux/module.h> | |
10 | #include <linux/string.h> | |
11 | ||
12 | void *memmove(void *dest, const void *src, size_t n) | |
13 | { | |
14 | void *xdest = dest; | |
15 | size_t temp; | |
16 | ||
17 | if (!n) | |
18 | return xdest; | |
19 | ||
20 | if (dest < src) { | |
21 | if ((long)dest & 1) { | |
22 | char *cdest = dest; | |
23 | const char *csrc = src; | |
24 | *cdest++ = *csrc++; | |
25 | dest = cdest; | |
26 | src = csrc; | |
27 | n--; | |
28 | } | |
29 | if (n > 2 && (long)dest & 2) { | |
30 | short *sdest = dest; | |
31 | const short *ssrc = src; | |
32 | *sdest++ = *ssrc++; | |
33 | dest = sdest; | |
34 | src = ssrc; | |
35 | n -= 2; | |
36 | } | |
37 | temp = n >> 2; | |
38 | if (temp) { | |
39 | long *ldest = dest; | |
40 | const long *lsrc = src; | |
41 | temp--; | |
42 | do | |
43 | *ldest++ = *lsrc++; | |
44 | while (temp--); | |
45 | dest = ldest; | |
46 | src = lsrc; | |
47 | } | |
48 | if (n & 2) { | |
49 | short *sdest = dest; | |
50 | const short *ssrc = src; | |
51 | *sdest++ = *ssrc++; | |
52 | dest = sdest; | |
53 | src = ssrc; | |
54 | } | |
55 | if (n & 1) { | |
56 | char *cdest = dest; | |
57 | const char *csrc = src; | |
58 | *cdest = *csrc; | |
59 | } | |
60 | } else { | |
61 | dest = (char *)dest + n; | |
62 | src = (const char *)src + n; | |
63 | if ((long)dest & 1) { | |
64 | char *cdest = dest; | |
65 | const char *csrc = src; | |
66 | *--cdest = *--csrc; | |
67 | dest = cdest; | |
68 | src = csrc; | |
69 | n--; | |
70 | } | |
71 | if (n > 2 && (long)dest & 2) { | |
72 | short *sdest = dest; | |
73 | const short *ssrc = src; | |
74 | *--sdest = *--ssrc; | |
75 | dest = sdest; | |
76 | src = ssrc; | |
77 | n -= 2; | |
78 | } | |
79 | temp = n >> 2; | |
80 | if (temp) { | |
81 | long *ldest = dest; | |
82 | const long *lsrc = src; | |
83 | temp--; | |
84 | do | |
85 | *--ldest = *--lsrc; | |
86 | while (temp--); | |
87 | dest = ldest; | |
88 | src = lsrc; | |
89 | } | |
90 | if (n & 2) { | |
91 | short *sdest = dest; | |
92 | const short *ssrc = src; | |
93 | *--sdest = *--ssrc; | |
94 | dest = sdest; | |
95 | src = ssrc; | |
96 | } | |
97 | if (n & 1) { | |
98 | char *cdest = dest; | |
99 | const char *csrc = src; | |
100 | *--cdest = *--csrc; | |
101 | } | |
102 | } | |
103 | return xdest; | |
104 | } | |
105 | EXPORT_SYMBOL(memmove); |