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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 <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);