160 lines
3.6 KiB
C
160 lines
3.6 KiB
C
/*
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* linux/lib/cmdline.c
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* Helper functions generally used for parsing kernel command line
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* and module options.
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*
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* Code and copyrights come from init/main.c and arch/i386/kernel/setup.c.
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*
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* GNU Indent formatting options for this file: -kr -i8 -npsl -pcs
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*
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*/
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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/*
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* If a hyphen was found in get_option, this will handle the
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* range of numbers, M-N. This will expand the range and insert
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* the values[M, M+1, ..., N] into the ints array in get_options.
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*/
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static int get_range(char **str, int *pint)
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{
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int x, inc_counter, upper_range;
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(*str)++;
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upper_range = simple_strtol((*str), NULL, 0);
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inc_counter = upper_range - *pint;
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for (x = *pint; x < upper_range; x++)
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*pint++ = x;
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return inc_counter;
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}
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/**
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* get_option - Parse integer from an option string
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* @str: option string
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* @pint: (output) integer value parsed from @str
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*
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* Read an int from an option string; if available accept a subsequent
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* comma as well.
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*
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* Return values:
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* 0 - no int in string
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* 1 - int found, no subsequent comma
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* 2 - int found including a subsequent comma
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* 3 - hyphen found to denote a range
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*/
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int get_option (char **str, int *pint)
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{
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char *cur = *str;
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if (!cur || !(*cur))
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return 0;
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*pint = simple_strtol (cur, str, 0);
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if (cur == *str)
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return 0;
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if (**str == ',') {
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(*str)++;
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return 2;
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}
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if (**str == '-')
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return 3;
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return 1;
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}
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/**
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* get_options - Parse a string into a list of integers
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* @str: String to be parsed
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* @nints: size of integer array
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* @ints: integer array
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*
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* This function parses a string containing a comma-separated
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* list of integers, a hyphen-separated range of _positive_ integers,
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* or a combination of both. The parse halts when the array is
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* full, or when no more numbers can be retrieved from the
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* string.
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*
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* Return value is the character in the string which caused
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* the parse to end (typically a null terminator, if @str is
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* completely parseable).
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*/
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char *get_options(const char *str, int nints, int *ints)
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{
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int res, i = 1;
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while (i < nints) {
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res = get_option ((char **)&str, ints + i);
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if (res == 0)
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break;
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if (res == 3) {
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int range_nums;
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range_nums = get_range((char **)&str, ints + i);
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if (range_nums < 0)
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break;
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/*
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* Decrement the result by one to leave out the
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* last number in the range. The next iteration
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* will handle the upper number in the range
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*/
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i += (range_nums - 1);
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}
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i++;
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if (res == 1)
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break;
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}
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ints[0] = i - 1;
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return (char *)str;
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}
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/**
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* memparse - parse a string with mem suffixes into a number
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* @ptr: Where parse begins
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* @retptr: (output) Optional pointer to next char after parse completes
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*
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* Parses a string into a number. The number stored at @ptr is
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* potentially suffixed with %K (for kilobytes, or 1024 bytes),
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* %M (for megabytes, or 1048576 bytes), or %G (for gigabytes, or
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* 1073741824). If the number is suffixed with K, M, or G, then
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* the return value is the number multiplied by one kilobyte, one
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* megabyte, or one gigabyte, respectively.
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*/
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unsigned long long memparse(const char *ptr, char **retptr)
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{
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char *endptr; /* local pointer to end of parsed string */
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unsigned long long ret = simple_strtoull(ptr, &endptr, 0);
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switch (*endptr) {
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case 'G':
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case 'g':
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ret <<= 10;
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case 'M':
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case 'm':
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ret <<= 10;
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case 'K':
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case 'k':
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ret <<= 10;
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endptr++;
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default:
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break;
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}
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if (retptr)
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*retptr = endptr;
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return ret;
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}
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EXPORT_SYMBOL(memparse);
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EXPORT_SYMBOL(get_option);
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EXPORT_SYMBOL(get_options);
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