[linux-2.6] / lib / cmdline.c

/*
 * 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(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;
		i++;
		if (res == 1)
			break;
	}
	ints[0] = i - 1;
	return (char *)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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/lib/cmdline.c
	3	* Helper functions generally used for parsing kernel command line
	4	* and module options.
	5	*
	6	* Code and copyrights come from init/main.c and arch/i386/kernel/setup.c.
	7	*
	8	* This source code is licensed under the GNU General Public License,
	9	* Version 2. See the file COPYING for more details.
	10	*
	11	* GNU Indent formatting options for this file: -kr -i8 -npsl -pcs
	12	*
	13	*/
	14
	15	#include <linux/module.h>
	16	#include <linux/kernel.h>
	17	#include <linux/string.h>
	18
	19
	20	/**
	21	* get_option - Parse integer from an option string
	22	* @str: option string
	23	* @pint: (output) integer value parsed from @str
	24	*
	25	* Read an int from an option string; if available accept a subsequent
	26	* comma as well.
	27	*
	28	* Return values:
	29	* 0 : no int in string
	30	* 1 : int found, no subsequent comma
	31	* 2 : int found including a subsequent comma
	32	*/
	33
	34	int get_option (char *str, int pint)
	35	{
	36	char cur = str;
	37
	38	if (!cur \|\| !(*cur))
	39	return 0;
	40	*pint = simple_strtol (cur, str, 0);
	41	if (cur == *str)
	42	return 0;
	43	if (**str == ',') {
	44	(*str)++;
	45	return 2;
	46	}
	47
	48	return 1;
	49	}
	50
	51	/**
	52	* get_options - Parse a string into a list of integers
	53	* @str: String to be parsed
	54	* @nints: size of integer array
	55	* @ints: integer array
	56	*
	57	* This function parses a string containing a comma-separated
	58	* list of integers. The parse halts when the array is
	59	* full, or when no more numbers can be retrieved from the
	60	* string.
	61	*
	62	* Return value is the character in the string which caused
	63	* the parse to end (typically a null terminator, if @str is
	64	* completely parseable).
65	*/
66
67	char get_options(const char str, int nints, int *ints)
68	{
69	int res, i = 1;
70
71	while (i < nints) {
72	res = get_option ((char **)&str, ints + i);
73	if (res == 0)
74	break;
75	i++;
76	if (res == 1)
77	break;
78	}
79	ints[0] = i - 1;
80	return (char *)str;
81	}
82
83	/**
84	* memparse - parse a string with mem suffixes into a number
85	* @ptr: Where parse begins
86	* @retptr: (output) Pointer to next char after parse completes
87	*
88	* Parses a string into a number. The number stored at @ptr is
89	* potentially suffixed with %K (for kilobytes, or 1024 bytes),
90	* %M (for megabytes, or 1048576 bytes), or %G (for gigabytes, or
91	* 1073741824). If the number is suffixed with K, M, or G, then
92	* the return value is the number multiplied by one kilobyte, one
93	* megabyte, or one gigabyte, respectively.
94	*/
95
96	unsigned long long memparse (char ptr, char *retptr)
97	{
98	unsigned long long ret = simple_strtoull (ptr, retptr, 0);
99
100	switch (**retptr) {
101	case 'G':
102	case 'g':
103	ret <<= 10;
104	case 'M':
105	case 'm':
106	ret <<= 10;
107	case 'K':
108	case 'k':
109	ret <<= 10;
110	(*retptr)++;
111	default:
112	break;
113	}
114	return ret;
115	}
116
117
118	EXPORT_SYMBOL(memparse);
119	EXPORT_SYMBOL(get_option);
120	EXPORT_SYMBOL(get_options);