Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/lib/cmdline.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 2716 byte(s)
Tag kernel26-2.6.12-alx-r9
1 | /* |
2 | * linux/lib/cmdline.c |
3 | * Helper functions generally used for parsing kernel command line |
4 | * and module options. |
5 | * |
6 | * Code and copyrights come from init/main.c and arch/i386/kernel/setup.c. |
7 | * |
8 | * This source code is licensed under the GNU General Public License, |
9 | * Version 2. See the file COPYING for more details. |
10 | * |
11 | * GNU Indent formatting options for this file: -kr -i8 -npsl -pcs |
12 | * |
13 | */ |
14 | |
15 | #include <linux/module.h> |
16 | #include <linux/kernel.h> |
17 | #include <linux/string.h> |
18 | |
19 | |
20 | /** |
21 | * get_option - Parse integer from an option string |
22 | * @str: option string |
23 | * @pint: (output) integer value parsed from @str |
24 | * |
25 | * Read an int from an option string; if available accept a subsequent |
26 | * comma as well. |
27 | * |
28 | * Return values: |
29 | * 0 : no int in string |
30 | * 1 : int found, no subsequent comma |
31 | * 2 : int found including a subsequent comma |
32 | */ |
33 | |
34 | int get_option (char **str, int *pint) |
35 | { |
36 | char *cur = *str; |
37 | |
38 | if (!cur || !(*cur)) |
39 | return 0; |
40 | *pint = simple_strtol (cur, str, 0); |
41 | if (cur == *str) |
42 | return 0; |
43 | if (**str == ',') { |
44 | (*str)++; |
45 | return 2; |
46 | } |
47 | |
48 | return 1; |
49 | } |
50 | |
51 | /** |
52 | * get_options - Parse a string into a list of integers |
53 | * @str: String to be parsed |
54 | * @nints: size of integer array |
55 | * @ints: integer array |
56 | * |
57 | * This function parses a string containing a comma-separated |
58 | * list of integers. The parse halts when the array is |
59 | * full, or when no more numbers can be retrieved from the |
60 | * string. |
61 | * |
62 | * Return value is the character in the string which caused |
63 | * the parse to end (typically a null terminator, if @str is |
64 | * completely parseable). |
65 | */ |
66 | |
67 | char *get_options(const char *str, int nints, int *ints) |
68 | { |
69 | int res, i = 1; |
70 | |
71 | while (i < nints) { |
72 | res = get_option ((char **)&str, ints + i); |
73 | if (res == 0) |
74 | break; |
75 | i++; |
76 | if (res == 1) |
77 | break; |
78 | } |
79 | ints[0] = i - 1; |
80 | return (char *)str; |
81 | } |
82 | |
83 | /** |
84 | * memparse - parse a string with mem suffixes into a number |
85 | * @ptr: Where parse begins |
86 | * @retptr: (output) Pointer to next char after parse completes |
87 | * |
88 | * Parses a string into a number. The number stored at @ptr is |
89 | * potentially suffixed with %K (for kilobytes, or 1024 bytes), |
90 | * %M (for megabytes, or 1048576 bytes), or %G (for gigabytes, or |
91 | * 1073741824). If the number is suffixed with K, M, or G, then |
92 | * the return value is the number multiplied by one kilobyte, one |
93 | * megabyte, or one gigabyte, respectively. |
94 | */ |
95 | |
96 | unsigned long long memparse (char *ptr, char **retptr) |
97 | { |
98 | unsigned long long ret = simple_strtoull (ptr, retptr, 0); |
99 | |
100 | switch (**retptr) { |
101 | case 'G': |
102 | case 'g': |
103 | ret <<= 10; |
104 | case 'M': |
105 | case 'm': |
106 | ret <<= 10; |
107 | case 'K': |
108 | case 'k': |
109 | ret <<= 10; |
110 | (*retptr)++; |
111 | default: |
112 | break; |
113 | } |
114 | return ret; |
115 | } |
116 | |
117 | |
118 | EXPORT_SYMBOL(memparse); |
119 | EXPORT_SYMBOL(get_option); |
120 | EXPORT_SYMBOL(get_options); |