/* * 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>#include <linux/ctype.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 n){ int x, inc_counter, upper_range; (*str)++; upper_range = simple_strtol((*str), NULL, 0); inc_counter = upper_range - *pint; for (x = *pint; n && x < upper_range; x++, n--) *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, nints - 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, M, G, T, P, E. */ 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 'E': case 'e': ret <<= 10; case 'P': case 'p': ret <<= 10; case 'T': case 't': ret <<= 10; 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); /** * parse_option_str - Parse a string and check an option is set or not * @str: String to be parsed * @option: option name * * This function parses a string containing a comma-separated list of * strings like a=b,c. * * Return true if there's such option in the string, or return false. */bool parse_option_str(const char *str, const char *option){ while (*str) { if (!strncmp(str, option, strlen(option))) { str += strlen(option); if (!*str || *str == ',') return true; } while (*str && *str != ',') str++; if (*str == ',') str++; } return false;} /* * Parse a string to get a param value pair. * You can use " around spaces, but can't escape ". * Hyphens and underscores equivalent in parameter names. */char *next_arg(char *args, char **param, char **val){ unsigned int i, equals = 0; int in_quote = 0, quoted = 0; char *next; if (*args == '"') { args++; in_quote = 1; quoted = 1; } for (i = 0; args[i]; i++) { if (isspace(args[i]) && !in_quote) break; if (equals == 0) { if (args[i] == '=') equals = i; } if (args[i] == '"') in_quote = !in_quote; } *param = args; if (!equals) *val = NULL; else { args[equals] = '\0'; *val = args + equals + 1; /* Don't include quotes in value. */ if (**val == '"') { (*val)++; if (args[i-1] == '"') args[i-1] = '\0'; } } if (quoted && args[i-1] == '"') args[i-1] = '\0'; if (args[i]) { args[i] = '\0'; next = args + i + 1; } else next = args + i; /* Chew up trailing spaces. */ return skip_spaces(next); //return next;}
/*
* 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>
#include <linux/ctype.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 n)
{
int x, inc_counter, upper_range;
(*str)++;
upper_range = simple_strtol((*str), NULL, 0);
inc_counter = upper_range - *pint;
for (x = *pint; n && x < upper_range; x++, n--)
*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, nints - 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, M, G, T, P, E.
*/
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 'E':
case 'e':
ret <<= 10;
case 'P':
case 'p':
ret <<= 10;
case 'T':
case 't':
ret <<= 10;
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);
/**
* parse_option_str - Parse a string and check an option is set or not
* @str: String to be parsed
* @option: option name
*
* This function parses a string containing a comma-separated list of
* strings like a=b,c.
*
* Return true if there's such option in the string, or return false.
*/
bool parse_option_str(const char *str, const char *option)
{
while (*str) {
if (!strncmp(str, option, strlen(option))) {
str += strlen(option);
if (!*str || *str == ',')
return true;
}
while (*str && *str != ',')
str++;
if (*str == ',')
str++;
}
return false;
}
/*
* Parse a string to get a param value pair.
* You can use " around spaces, but can't escape ".
* Hyphens and underscores equivalent in parameter names.
*/
char *next_arg(char *args, char **param, char **val)
{
unsigned int i, equals = 0;
int in_quote = 0, quoted = 0;
char *next;
if (*args == '"') {
args++;
in_quote = 1;
quoted = 1;
}
for (i = 0; args[i]; i++) {
if (isspace(args[i]) && !in_quote)
break;
if (equals == 0) {
if (args[i] == '=')
equals = i;
}
if (args[i] == '"')
in_quote = !in_quote;
}
*param = args;
if (!equals)
*val = NULL;
else {
args[equals] = '\0';
*val = args + equals + 1;
/* Don't include quotes in value. */
if (**val == '"') {
(*val)++;
if (args[i-1] == '"')
args[i-1] = '\0';
}
}
if (quoted && args[i-1] == '"')
args[i-1] = '\0';
if (args[i]) {
args[i] = '\0';
next = args + i + 1;
} else
next = args + i;
/* Chew up trailing spaces. */
return skip_spaces(next);
//return next;
}