0,0 → 1,122 |
/* |
* 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 <linuxcomp.h> |
|
#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); |