root/fs/smbfs/getopt.c

DEFINITIONS

1. smb_getopt

/*
 * getopt.c
 */

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/net.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;
}