/* * 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/module.h>#include <linux/kernel.h>#include <linux/string.h>/** *	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 */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;	}	return 1;}/** *	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.  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 (char *str, int nints, int *ints){	int res, i = 1;	while (i < nints) {		res = get_option (&str, ints + i);		if (res == 0)			break;		i++;		if (res == 1)			break;	}	ints[0] = i - 1;	return (str);}/** *	memparse - parse a string with mem suffixes into a number *	@ptr: Where parse begins *	@retptr: (output) 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 (char *ptr, char **retptr){	unsigned long long ret = simple_strtoull (ptr, retptr, 0);	switch (**retptr) {	case 'G':	case 'g':		ret <<= 10;	case 'M':	case 'm':		ret <<= 10;	case 'K':	case 'k':		ret <<= 10;		(*retptr)++;	default:		break;	}	return ret;}EXPORT_SYMBOL(memparse);EXPORT_SYMBOL(get_option);EXPORT_SYMBOL(get_options);