3 * Helper functions generally used for parsing kernel command line
6 * Code and copyrights come from init/main.c and arch/i386/kernel/setup.c.
8 * This source code is licensed under the GNU General Public License,
9 * Version 2. See the file COPYING for more details.
11 * GNU Indent formatting options for this file: -kr -i8 -npsl -pcs
15 #include <linux/module.h>
16 #include <linux/kernel.h>
17 #include <linux/string.h>
20 * If a hyphen was found in get_option, this will handle the
21 * range of numbers, M-N. This will expand the range and insert
22 * the values[M, M+1, ..., N] into the ints array in get_options.
25 static int get_range(char **str
, int *pint
)
27 int x
, inc_counter
, upper_range
;
30 upper_range
= simple_strtol((*str
), NULL
, 0);
31 inc_counter
= upper_range
- *pint
;
32 for (x
= *pint
; x
< upper_range
; x
++)
38 * get_option - Parse integer from an option string
40 * @pint: (output) integer value parsed from @str
42 * Read an int from an option string; if available accept a subsequent
46 * 0 - no int in string
47 * 1 - int found, no subsequent comma
48 * 2 - int found including a subsequent comma
49 * 3 - hyphen found to denote a range
52 int get_option (char **str
, int *pint
)
58 *pint
= simple_strtol (cur
, str
, 0);
72 * get_options - Parse a string into a list of integers
73 * @str: String to be parsed
74 * @nints: size of integer array
75 * @ints: integer array
77 * This function parses a string containing a comma-separated
78 * list of integers, a hyphen-separated range of _positive_ integers,
79 * or a combination of both. The parse halts when the array is
80 * full, or when no more numbers can be retrieved from the
83 * Return value is the character in the string which caused
84 * the parse to end (typically a null terminator, if @str is
85 * completely parseable).
88 char *get_options(const char *str
, int nints
, int *ints
)
93 res
= get_option ((char **)&str
, ints
+ i
);
98 range_nums
= get_range((char **)&str
, ints
+ i
);
102 * Decrement the result by one to leave out the
103 * last number in the range. The next iteration
104 * will handle the upper number in the range
106 i
+= (range_nums
- 1);
117 * memparse - parse a string with mem suffixes into a number
118 * @ptr: Where parse begins
119 * @retptr: (output) Optional pointer to next char after parse completes
121 * Parses a string into a number. The number stored at @ptr is
122 * potentially suffixed with %K (for kilobytes, or 1024 bytes),
123 * %M (for megabytes, or 1048576 bytes), or %G (for gigabytes, or
124 * 1073741824). If the number is suffixed with K, M, or G, then
125 * the return value is the number multiplied by one kilobyte, one
126 * megabyte, or one gigabyte, respectively.
129 unsigned long long memparse(const char *ptr
, char **retptr
)
131 char *endptr
; /* local pointer to end of parsed string */
133 unsigned long long ret
= simple_strtoull(ptr
, &endptr
, 0);
157 EXPORT_SYMBOL(memparse
);
158 EXPORT_SYMBOL(get_option
);
159 EXPORT_SYMBOL(get_options
);
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