mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-05 18:14:07 +08:00
65dd36a39d
At least one module will benefit from using next_arg() helper. Let's export it for that module and others if they consider it helpful. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
276 lines
5.8 KiB
C
276 lines
5.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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.
|
|
*
|
|
* 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: (optional output) integer value parsed from @str
|
|
*
|
|
* Read an int from an option string; if available accept a subsequent
|
|
* comma as well.
|
|
*
|
|
* When @pint is NULL the function can be used as a validator of
|
|
* the current option in the string.
|
|
*
|
|
* 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
|
|
*
|
|
* Leading hyphen without integer is no integer case, but we consume it
|
|
* for the sake of simplification.
|
|
*/
|
|
|
|
int get_option(char **str, int *pint)
|
|
{
|
|
char *cur = *str;
|
|
int value;
|
|
|
|
if (!cur || !(*cur))
|
|
return 0;
|
|
if (*cur == '-')
|
|
value = -simple_strtoull(++cur, str, 0);
|
|
else
|
|
value = simple_strtoull(cur, str, 0);
|
|
if (pint)
|
|
*pint = value;
|
|
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 (must have room for at least one element)
|
|
*
|
|
* 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.
|
|
*
|
|
* When @nints is 0, the function just validates the given @str and
|
|
* returns the amount of parseable integers as described below.
|
|
*
|
|
* Returns:
|
|
*
|
|
* The first element is filled by the number of collected integers
|
|
* in the range. The rest is what was parsed from the @str.
|
|
*
|
|
* 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)
|
|
{
|
|
bool validate = (nints == 0);
|
|
int res, i = 1;
|
|
|
|
while (i < nints || validate) {
|
|
int *pint = validate ? ints : ints + i;
|
|
|
|
res = get_option((char **)&str, pint);
|
|
if (res == 0)
|
|
break;
|
|
if (res == 3) {
|
|
int n = validate ? 0 : nints - i;
|
|
int range_nums;
|
|
|
|
range_nums = get_range((char **)&str, pint, n);
|
|
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;
|
|
fallthrough;
|
|
case 'P':
|
|
case 'p':
|
|
ret <<= 10;
|
|
fallthrough;
|
|
case 'T':
|
|
case 't':
|
|
ret <<= 10;
|
|
fallthrough;
|
|
case 'G':
|
|
case 'g':
|
|
ret <<= 10;
|
|
fallthrough;
|
|
case 'M':
|
|
case 'm':
|
|
ret <<= 10;
|
|
fallthrough;
|
|
case 'K':
|
|
case 'k':
|
|
ret <<= 10;
|
|
endptr++;
|
|
fallthrough;
|
|
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;
|
|
|
|
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';
|
|
args += i + 1;
|
|
} else
|
|
args += i;
|
|
|
|
/* Chew up trailing spaces. */
|
|
return skip_spaces(args);
|
|
}
|
|
EXPORT_SYMBOL(next_arg);
|