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