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/*

 * getopt.c

 */

#include <linux/kernel.h>

#include <linux/string.h>

#include "getopt.h"

/**

 *      smb_getopt - option parser

 *      @caller: name of the caller, for error messages

 *      @options: the options string

 *      @opts: an array of &struct option entries controlling parser operations

 *      @optopt: output; will contain the current option

 *      @optarg: output; will contain the value (if one exists)

 *      @flag: output; may be NULL; should point to a long for or'ing flags

 *      @value: output; may be NULL; will be overwritten with the integer value

 *              of the current argument.

 *

 *      Helper to parse options on the format used by mount ("a=b,c=d,e,f").

 *      Returns opts->val if a matching entry in the 'opts' array is found,

 *      0 when no more tokens are found, -1 if an error is encountered.

 */

int smb_getopt(char *caller, char **options, struct option *opts,

               char **optopt, char **optarg, unsigned long *flag,

               unsigned long *value)

{

        char *token;

        char *val;

        int i;

        do {

                if ((token = strsep(options, ",")) == NULL)

                        return 0;

        } while (*token == '\0');

        *optopt = token;

        *optarg = NULL;

        if ((val = strchr (token, '=')) != NULL) {

                *val++ = 0;

                if (value)

                        *value = simple_strtoul(val, NULL, 0);

                *optarg = val;

        }

        for (i = 0; opts[i].name != NULL; i++) {

                if (!strcmp(opts[i].name, token)) {

                        if (!opts[i].flag && (!val || !*val)) {

                                printk("%s: the %s option requires an argument\n",

                                       caller, token);

                                return -1;

                        }

                        if (flag && opts[i].flag)

                                *flag |= opts[i].flag;

                        return opts[i].val;

                }

        }

        printk("%s: Unrecognized mount option %s\n", caller, token);

        return -1;

}