| 1 |
/* |
1 |
/* |
| 2 |
* linux/lib/string.c |
2 |
* linux/lib/string.c |
| 3 |
* |
3 |
* |
| 4 |
* Copyright (C) 1991, 1992 Linus Torvalds |
4 |
* Copyright (C) 1991, 1992 Linus Torvalds |
| 5 |
*/ |
5 |
*/ |
| 6 |
|
6 |
|
| 7 |
/* |
7 |
/* |
| 8 |
* stupid library routines.. The optimized versions should generally be found |
8 |
* stupid library routines.. The optimized versions should generally be found |
| 9 |
* as inline code in |
9 |
* as inline code in |
| 10 |
* |
10 |
* |
| 11 |
* These are buggy as well.. |
11 |
* These are buggy as well.. |
| 12 |
* |
12 |
* |
| 13 |
* * Fri Jun 25 1999, Ingo Oeser |
13 |
* * Fri Jun 25 1999, Ingo Oeser |
| 14 |
* - Added strsep() which will replace strtok() soon (because strsep() is |
14 |
* - Added strsep() which will replace strtok() soon (because strsep() is |
| 15 |
* reentrant and should be faster). Use only strsep() in new code, please. |
15 |
* reentrant and should be faster). Use only strsep() in new code, please. |
| 16 |
* |
16 |
* |
| 17 |
* * Sat Feb 09 2002, Jason Thomas , |
17 |
* * Sat Feb 09 2002, Jason Thomas , |
| 18 |
* Matthew Hawkins |
18 |
* Matthew Hawkins |
| 19 |
* - Kissed strtok() goodbye |
19 |
* - Kissed strtok() goodbye |
| 20 |
*/ |
20 |
*/ |
| 21 |
|
21 |
|
| 22 |
#include |
22 |
#include |
| 23 |
#include |
23 |
#include |
| 24 |
#include |
24 |
#include |
| 25 |
#include |
25 |
#include |
| 26 |
#include |
26 |
#include |
| 27 |
#include |
27 |
#include |
| 28 |
#include |
28 |
#include |
| 29 |
|
29 |
|
| - |
|
30 |
|
| - |
|
31 |
#ifndef __HAVE_ARCH_STRNCPY |
| - |
|
32 |
/** |
| - |
|
33 |
* strncpy - Copy a length-limited, C-string |
| - |
|
34 |
* @dest: Where to copy the string to |
| - |
|
35 |
* @src: Where to copy the string from |
| - |
|
36 |
* @count: The maximum number of bytes to copy |
| - |
|
37 |
* |
| - |
|
38 |
* The result is not %NUL-terminated if the source exceeds |
| - |
|
39 |
* @count bytes. |
| - |
|
40 |
* |
| - |
|
41 |
* In the case where the length of @src is less than that of |
| - |
|
42 |
* count, the remainder of @dest will be padded with %NUL. |
| - |
|
43 |
* |
| - |
|
44 |
*/ |
| - |
|
45 |
char *strncpy(char *dest, const char *src, size_t count) |
| - |
|
46 |
{ |
| - |
|
47 |
char *tmp = dest; |
| - |
|
48 |
|
| - |
|
49 |
while (count) { |
| - |
|
50 |
if ((*tmp = *src) != 0) |
| - |
|
51 |
src++; |
| - |
|
52 |
tmp++; |
| - |
|
53 |
count--; |
| - |
|
54 |
} |
| - |
|
55 |
return dest; |
| - |
|
56 |
} |
| - |
|
57 |
EXPORT_SYMBOL(strncpy); |
| 30 |
|
58 |
#endif |
| 31 |
|
59 |
|
| 32 |
#ifndef __HAVE_ARCH_STRLCPY |
60 |
#ifndef __HAVE_ARCH_STRLCPY |
| 33 |
/** |
61 |
/** |
| 34 |
* strlcpy - Copy a C-string into a sized buffer |
62 |
* strlcpy - Copy a C-string into a sized buffer |
| 35 |
* @dest: Where to copy the string to |
63 |
* @dest: Where to copy the string to |
| 36 |
* @src: Where to copy the string from |
64 |
* @src: Where to copy the string from |
| 37 |
* @size: size of destination buffer |
65 |
* @size: size of destination buffer |
| 38 |
* |
66 |
* |
| 39 |
* Compatible with *BSD: the result is always a valid |
67 |
* Compatible with *BSD: the result is always a valid |
| 40 |
* NUL-terminated string that fits in the buffer (unless, |
68 |
* NUL-terminated string that fits in the buffer (unless, |
| 41 |
* of course, the buffer size is zero). It does not pad |
69 |
* of course, the buffer size is zero). It does not pad |
| 42 |
* out the result like strncpy() does. |
70 |
* out the result like strncpy() does. |
| 43 |
*/ |
71 |
*/ |
| 44 |
size_t strlcpy(char *dest, const char *src, size_t size) |
72 |
size_t strlcpy(char *dest, const char *src, size_t size) |
| 45 |
{ |
73 |
{ |
| 46 |
size_t ret = strlen(src); |
74 |
size_t ret = strlen(src); |
| 47 |
|
75 |
|
| 48 |
if (size) { |
76 |
if (size) { |
| 49 |
size_t len = (ret >= size) ? size - 1 : ret; |
77 |
size_t len = (ret >= size) ? size - 1 : ret; |
| 50 |
memcpy(dest, src, len); |
78 |
memcpy(dest, src, len); |
| 51 |
dest[len] = '\0'; |
79 |
dest[len] = '\0'; |
| 52 |
} |
80 |
} |
| 53 |
return ret; |
81 |
return ret; |
| 54 |
} |
82 |
} |
| 55 |
|
83 |
|
| 56 |
#ifndef __HAVE_ARCH_STRLCAT |
84 |
#ifndef __HAVE_ARCH_STRLCAT |
| 57 |
/** |
85 |
/** |
| 58 |
* strlcat - Append a length-limited, C-string to another |
86 |
* strlcat - Append a length-limited, C-string to another |
| 59 |
* @dest: The string to be appended to |
87 |
* @dest: The string to be appended to |
| 60 |
* @src: The string to append to it |
88 |
* @src: The string to append to it |
| 61 |
* @count: The size of the destination buffer. |
89 |
* @count: The size of the destination buffer. |
| 62 |
*/ |
90 |
*/ |
| 63 |
size_t strlcat(char *dest, const char *src, size_t count) |
91 |
size_t strlcat(char *dest, const char *src, size_t count) |
| 64 |
{ |
92 |
{ |
| 65 |
size_t dsize = strlen(dest); |
93 |
size_t dsize = strlen(dest); |
| 66 |
size_t len = strlen(src); |
94 |
size_t len = strlen(src); |
| 67 |
size_t res = dsize + len; |
95 |
size_t res = dsize + len; |
| 68 |
|
96 |
|
| 69 |
/* This would be a bug */ |
97 |
/* This would be a bug */ |
| 70 |
BUG_ON(dsize >= count); |
98 |
BUG_ON(dsize >= count); |
| 71 |
|
99 |
|
| 72 |
dest += dsize; |
100 |
dest += dsize; |
| 73 |
count -= dsize; |
101 |
count -= dsize; |
| 74 |
if (len >= count) |
102 |
if (len >= count) |
| 75 |
len = count-1; |
103 |
len = count-1; |
| 76 |
memcpy(dest, src, len); |
104 |
memcpy(dest, src, len); |
| 77 |
dest[len] = 0; |
105 |
dest[len] = 0; |
| 78 |
return res; |
106 |
return res; |
| 79 |
} |
107 |
} |
| 80 |
#endif |
108 |
#endif |
| 81 |
|
109 |
|
| 82 |
|
110 |
|
| 83 |
#endif |
111 |
#endif |