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