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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 509 | giacomo | 1 | /* |
| 2 | * linux/lib/cmdline.c |
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| 3 | * Helper functions generally used for parsing kernel command line |
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| 4 | * and module options. |
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| 5 | * |
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| 6 | * Code and copyrights come from init/main.c and arch/i386/kernel/setup.c. |
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| 7 | * |
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| 8 | * This source code is licensed under the GNU General Public License, |
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| 9 | * Version 2. See the file COPYING for more details. |
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| 10 | * |
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| 11 | * GNU Indent formatting options for this file: -kr -i8 -npsl -pcs |
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| 12 | * |
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| 13 | */ |
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| 14 | |||
| 15 | #include <linuxcomp.h> |
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| 16 | |||
| 17 | #include <linux/module.h> |
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| 18 | #include <linux/kernel.h> |
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| 19 | #include <linux/string.h> |
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| 20 | |||
| 21 | |||
| 22 | /** |
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| 23 | * get_option - Parse integer from an option string |
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| 24 | * @str: option string |
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| 25 | * @pint: (output) integer value parsed from @str |
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| 26 | * |
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| 27 | * Read an int from an option string; if available accept a subsequent |
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| 28 | * comma as well. |
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| 29 | * |
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| 30 | * Return values: |
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| 31 | * 0 : no int in string |
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| 32 | * 1 : int found, no subsequent comma |
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| 33 | * 2 : int found including a subsequent comma |
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| 34 | */ |
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| 35 | |||
| 36 | int get_option (char **str, int *pint) |
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| 37 | { |
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| 38 | char *cur = *str; |
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| 39 | |||
| 40 | if (!cur || !(*cur)) |
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| 41 | return 0; |
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| 42 | *pint = simple_strtol (cur, str, 0); |
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| 43 | if (cur == *str) |
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| 44 | return 0; |
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| 45 | if (**str == ',') { |
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| 46 | (*str)++; |
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| 47 | return 2; |
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| 48 | } |
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| 49 | |||
| 50 | return 1; |
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| 51 | } |
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| 52 | |||
| 53 | /** |
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| 54 | * get_options - Parse a string into a list of integers |
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| 55 | * @str: String to be parsed |
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| 56 | * @nints: size of integer array |
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| 57 | * @ints: integer array |
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| 58 | * |
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| 59 | * This function parses a string containing a comma-separated |
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| 60 | * list of integers. The parse halts when the array is |
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| 61 | * full, or when no more numbers can be retrieved from the |
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| 62 | * string. |
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| 63 | * |
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| 64 | * Return value is the character in the string which caused |
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| 65 | * the parse to end (typically a null terminator, if @str is |
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| 66 | * completely parseable). |
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| 67 | */ |
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| 68 | |||
| 69 | char *get_options(const char *str, int nints, int *ints) |
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| 70 | { |
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| 71 | int res, i = 1; |
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| 72 | |||
| 73 | while (i < nints) { |
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| 74 | res = get_option ((char **)&str, ints + i); |
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| 75 | if (res == 0) |
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| 76 | break; |
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| 77 | i++; |
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| 78 | if (res == 1) |
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| 79 | break; |
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| 80 | } |
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| 81 | ints[0] = i - 1; |
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| 82 | return (char *)str; |
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| 83 | } |
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| 84 | |||
| 85 | /** |
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| 86 | * memparse - parse a string with mem suffixes into a number |
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| 87 | * @ptr: Where parse begins |
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| 88 | * @retptr: (output) Pointer to next char after parse completes |
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| 89 | * |
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| 90 | * Parses a string into a number. The number stored at @ptr is |
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| 91 | * potentially suffixed with %K (for kilobytes, or 1024 bytes), |
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| 92 | * %M (for megabytes, or 1048576 bytes), or %G (for gigabytes, or |
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| 93 | * 1073741824). If the number is suffixed with K, M, or G, then |
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| 94 | * the return value is the number multiplied by one kilobyte, one |
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| 95 | * megabyte, or one gigabyte, respectively. |
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| 96 | */ |
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| 97 | |||
| 98 | unsigned long long memparse (char *ptr, char **retptr) |
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| 99 | { |
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| 100 | unsigned long long ret = simple_strtoull (ptr, retptr, 0); |
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| 101 | |||
| 102 | switch (**retptr) { |
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| 103 | case 'G': |
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| 104 | case 'g': |
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| 105 | ret <<= 10; |
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| 106 | case 'M': |
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| 107 | case 'm': |
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| 108 | ret <<= 10; |
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| 109 | case 'K': |
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| 110 | case 'k': |
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| 111 | ret <<= 10; |
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| 112 | (*retptr)++; |
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| 113 | default: |
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| 114 | break; |
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| 115 | } |
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| 116 | return ret; |
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| 117 | } |
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| 118 | |||
| 119 | |||
| 120 | EXPORT_SYMBOL(memparse); |
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| 121 | EXPORT_SYMBOL(get_option); |
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| 122 | EXPORT_SYMBOL(get_options); |