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/export.h>
 16#include <linux/kernel.h>
 17#include <linux/string.h>
 18
 19/*
 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.
 23 */
 24
 25static int get_range(char **str, int *pint)
 26{
 27	int x, inc_counter, upper_range;
 28
 29	(*str)++;
 30	upper_range = simple_strtol((*str), NULL, 0);
 31	inc_counter = upper_range - *pint;
 32	for (x = *pint; x < upper_range; x++)
 33		*pint++ = x;
 34	return inc_counter;
 35}
 36
 37/**
 38 *	get_option - Parse integer from an option string
 39 *	@str: option string
 40 *	@pint: (output) integer value parsed from @str
 41 *
 42 *	Read an int from an option string; if available accept a subsequent
 43 *	comma as well.
 44 *
 45 *	Return values:
 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
 50 */
 51
 52int get_option(char **str, int *pint)
 53{
 54	char *cur = *str;
 55
 56	if (!cur || !(*cur))
 57		return 0;
 58	*pint = simple_strtol(cur, str, 0);
 59	if (cur == *str)
 60		return 0;
 61	if (**str == ',') {
 62		(*str)++;
 63		return 2;
 64	}
 65	if (**str == '-')
 66		return 3;
 67
 68	return 1;
 69}
 70EXPORT_SYMBOL(get_option);
 71
 72/**
 73 *	get_options - Parse a string into a list of integers
 74 *	@str: String to be parsed
 75 *	@nints: size of integer array
 76 *	@ints: integer array
 77 *
 78 *	This function parses a string containing a comma-separated
 79 *	list of integers, a hyphen-separated range of _positive_ integers,
 80 *	or a combination of both.  The parse halts when the array is
 81 *	full, or when no more numbers can be retrieved from the
 82 *	string.
 83 *
 84 *	Return value is the character in the string which caused
 85 *	the parse to end (typically a null terminator, if @str is
 86 *	completely parseable).
 87 */
 88
 89char *get_options(const char *str, int nints, int *ints)
 90{
 91	int res, i = 1;
 92
 93	while (i < nints) {
 94		res = get_option((char **)&str, ints + i);
 95		if (res == 0)
 96			break;
 97		if (res == 3) {
 98			int range_nums;
 99			range_nums = get_range((char **)&str, ints + i);
100			if (range_nums < 0)
101				break;
102			/*
103			 * Decrement the result by one to leave out the
104			 * last number in the range.  The next iteration
105			 * will handle the upper number in the range
106			 */
107			i += (range_nums - 1);
108		}
109		i++;
110		if (res == 1)
111			break;
112	}
113	ints[0] = i - 1;
114	return (char *)str;
115}
116EXPORT_SYMBOL(get_options);
117
118/**
119 *	memparse - parse a string with mem suffixes into a number
120 *	@ptr: Where parse begins
121 *	@retptr: (output) Optional pointer to next char after parse completes
122 *
123 *	Parses a string into a number.  The number stored at @ptr is
124 *	potentially suffixed with %K (for kilobytes, or 1024 bytes),
125 *	%M (for megabytes, or 1048576 bytes), or %G (for gigabytes, or
126 *	1073741824).  If the number is suffixed with K, M, or G, then
127 *	the return value is the number multiplied by one kilobyte, one
128 *	megabyte, or one gigabyte, respectively.
129 */
130
131unsigned long long memparse(const char *ptr, char **retptr)
132{
133	char *endptr;	/* local pointer to end of parsed string */
134
135	unsigned long long ret = simple_strtoull(ptr, &endptr, 0);
136
137	switch (*endptr) {
 
 
 
 
 
 
 
 
 
138	case 'G':
139	case 'g':
140		ret <<= 10;
141	case 'M':
142	case 'm':
143		ret <<= 10;
144	case 'K':
145	case 'k':
146		ret <<= 10;
147		endptr++;
148	default:
149		break;
150	}
151
152	if (retptr)
153		*retptr = endptr;
154
155	return ret;
156}
157EXPORT_SYMBOL(memparse);

  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/export.h>
 16#include <linux/kernel.h>
 17#include <linux/string.h>
 18
 19/*
 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.
 23 */
 24
 25static int get_range(char **str, int *pint)
 26{
 27	int x, inc_counter, upper_range;
 28
 29	(*str)++;
 30	upper_range = simple_strtol((*str), NULL, 0);
 31	inc_counter = upper_range - *pint;
 32	for (x = *pint; x < upper_range; x++)
 33		*pint++ = x;
 34	return inc_counter;
 35}
 36
 37/**
 38 *	get_option - Parse integer from an option string
 39 *	@str: option string
 40 *	@pint: (output) integer value parsed from @str
 41 *
 42 *	Read an int from an option string; if available accept a subsequent
 43 *	comma as well.
 44 *
 45 *	Return values:
 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
 50 */
 51
 52int get_option(char **str, int *pint)
 53{
 54	char *cur = *str;
 55
 56	if (!cur || !(*cur))
 57		return 0;
 58	*pint = simple_strtol(cur, str, 0);
 59	if (cur == *str)
 60		return 0;
 61	if (**str == ',') {
 62		(*str)++;
 63		return 2;
 64	}
 65	if (**str == '-')
 66		return 3;
 67
 68	return 1;
 69}
 70EXPORT_SYMBOL(get_option);
 71
 72/**
 73 *	get_options - Parse a string into a list of integers
 74 *	@str: String to be parsed
 75 *	@nints: size of integer array
 76 *	@ints: integer array
 77 *
 78 *	This function parses a string containing a comma-separated
 79 *	list of integers, a hyphen-separated range of _positive_ integers,
 80 *	or a combination of both.  The parse halts when the array is
 81 *	full, or when no more numbers can be retrieved from the
 82 *	string.
 83 *
 84 *	Return value is the character in the string which caused
 85 *	the parse to end (typically a null terminator, if @str is
 86 *	completely parseable).
 87 */
 88
 89char *get_options(const char *str, int nints, int *ints)
 90{
 91	int res, i = 1;
 92
 93	while (i < nints) {
 94		res = get_option((char **)&str, ints + i);
 95		if (res == 0)
 96			break;
 97		if (res == 3) {
 98			int range_nums;
 99			range_nums = get_range((char **)&str, ints + i);
100			if (range_nums < 0)
101				break;
102			/*
103			 * Decrement the result by one to leave out the
104			 * last number in the range.  The next iteration
105			 * will handle the upper number in the range
106			 */
107			i += (range_nums - 1);
108		}
109		i++;
110		if (res == 1)
111			break;
112	}
113	ints[0] = i - 1;
114	return (char *)str;
115}
116EXPORT_SYMBOL(get_options);
117
118/**
119 *	memparse - parse a string with mem suffixes into a number
120 *	@ptr: Where parse begins
121 *	@retptr: (output) Optional pointer to next char after parse completes
122 *
123 *	Parses a string into a number.  The number stored at @ptr is
124 *	potentially suffixed with K, M, G, T, P, E.
 
 
 
 
125 */
126
127unsigned long long memparse(const char *ptr, char **retptr)
128{
129	char *endptr;	/* local pointer to end of parsed string */
130
131	unsigned long long ret = simple_strtoull(ptr, &endptr, 0);
132
133	switch (*endptr) {
134	case 'E':
135	case 'e':
136		ret <<= 10;
137	case 'P':
138	case 'p':
139		ret <<= 10;
140	case 'T':
141	case 't':
142		ret <<= 10;
143	case 'G':
144	case 'g':
145		ret <<= 10;
146	case 'M':
147	case 'm':
148		ret <<= 10;
149	case 'K':
150	case 'k':
151		ret <<= 10;
152		endptr++;
153	default:
154		break;
155	}
156
157	if (retptr)
158		*retptr = endptr;
159
160	return ret;
161}
162EXPORT_SYMBOL(memparse);
163
164/**
165 *	parse_option_str - Parse a string and check an option is set or not
166 *	@str: String to be parsed
167 *	@option: option name
168 *
169 *	This function parses a string containing a comma-separated list of
170 *	strings like a=b,c.
171 *
172 *	Return true if there's such option in the string, or return false.
173 */
174bool parse_option_str(const char *str, const char *option)
175{
176	while (*str) {
177		if (!strncmp(str, option, strlen(option))) {
178			str += strlen(option);
179			if (!*str || *str == ',')
180				return true;
181		}
182
183		while (*str && *str != ',')
184			str++;
185
186		if (*str == ',')
187			str++;
188	}
189
190	return false;
191}