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/*

 * 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>

/*

 *      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 x, inc_counter, upper_range;

        (*str)++;

        upper_range = simple_strtol((*str), NULL, 0);

        inc_counter = upper_range - *pint;

        for (x = *pint; x < upper_range; x++)

                *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;

}

/**

 *      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);

                        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;

}

/**

 *      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);