Root/
1 | /* |
2 | * Helper function for splitting a string into an argv-like array. |
3 | */ |
4 | |
5 | #include <linux/kernel.h> |
6 | #include <linux/ctype.h> |
7 | #include <linux/string.h> |
8 | #include <linux/slab.h> |
9 | #include <linux/export.h> |
10 | |
11 | static int count_argc(const char *str) |
12 | { |
13 | int count = 0; |
14 | bool was_space; |
15 | |
16 | for (was_space = true; *str; str++) { |
17 | if (isspace(*str)) { |
18 | was_space = true; |
19 | } else if (was_space) { |
20 | was_space = false; |
21 | count++; |
22 | } |
23 | } |
24 | |
25 | return count; |
26 | } |
27 | |
28 | /** |
29 | * argv_free - free an argv |
30 | * @argv - the argument vector to be freed |
31 | * |
32 | * Frees an argv and the strings it points to. |
33 | */ |
34 | void argv_free(char **argv) |
35 | { |
36 | argv--; |
37 | kfree(argv[0]); |
38 | kfree(argv); |
39 | } |
40 | EXPORT_SYMBOL(argv_free); |
41 | |
42 | /** |
43 | * argv_split - split a string at whitespace, returning an argv |
44 | * @gfp: the GFP mask used to allocate memory |
45 | * @str: the string to be split |
46 | * @argcp: returned argument count |
47 | * |
48 | * Returns an array of pointers to strings which are split out from |
49 | * @str. This is performed by strictly splitting on white-space; no |
50 | * quote processing is performed. Multiple whitespace characters are |
51 | * considered to be a single argument separator. The returned array |
52 | * is always NULL-terminated. Returns NULL on memory allocation |
53 | * failure. |
54 | * |
55 | * The source string at `str' may be undergoing concurrent alteration via |
56 | * userspace sysctl activity (at least). The argv_split() implementation |
57 | * attempts to handle this gracefully by taking a local copy to work on. |
58 | */ |
59 | char **argv_split(gfp_t gfp, const char *str, int *argcp) |
60 | { |
61 | char *argv_str; |
62 | bool was_space; |
63 | char **argv, **argv_ret; |
64 | int argc; |
65 | |
66 | argv_str = kstrndup(str, KMALLOC_MAX_SIZE - 1, gfp); |
67 | if (!argv_str) |
68 | return NULL; |
69 | |
70 | argc = count_argc(argv_str); |
71 | argv = kmalloc(sizeof(*argv) * (argc + 2), gfp); |
72 | if (!argv) { |
73 | kfree(argv_str); |
74 | return NULL; |
75 | } |
76 | |
77 | *argv = argv_str; |
78 | argv_ret = ++argv; |
79 | for (was_space = true; *argv_str; argv_str++) { |
80 | if (isspace(*argv_str)) { |
81 | was_space = true; |
82 | *argv_str = 0; |
83 | } else if (was_space) { |
84 | was_space = false; |
85 | *argv++ = argv_str; |
86 | } |
87 | } |
88 | *argv = NULL; |
89 | |
90 | if (argcp) |
91 | *argcp = argc; |
92 | return argv_ret; |
93 | } |
94 | EXPORT_SYMBOL(argv_split); |
95 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9