root/fs/ncpfs/getopt.c

DEFINITIONS

1. ncp_getopt

/*
 * getopt.c
 */

#include <linux/kernel.h>
#include <linux/string.h>

#include <asm/errno.h>

#include "getopt.h"

/**
 *      ncp_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 ncp_getopt(const char *caller, char **options, const struct ncp_option *opts,
               char **optopt, char **optarg, unsigned long *value)
{
        char *token;
        char *val;

        do {
                if ((token = strsep(options, ",")) == NULL)
                        return 0;
        } while (*token == '\0');
        if (optopt)
                *optopt = token;

        if ((val = strchr (token, '=')) != NULL) {
                *val++ = 0;
        }
        *optarg = val;
        for (; opts->name; opts++) {
                if (!strcmp(opts->name, token)) {
                        if (!val) {
                                if (opts->has_arg & OPT_NOPARAM) {
                                        return opts->val;
                                }
                                printk(KERN_INFO "%s: the %s option requires an argument\n",
                                       caller, token);
                                return -EINVAL;
                        }
                        if (opts->has_arg & OPT_INT) {
                                char* v;

                                *value = simple_strtoul(val, &v, 0);
                                if (!*v) {
                                        return opts->val;
                                }
                                printk(KERN_INFO "%s: invalid numeric value in %s=%s\n",
                                        caller, token, val);
                                return -EDOM;
                        }
                        if (opts->has_arg & OPT_STRING) {
                                return opts->val;
                        }
                        printk(KERN_INFO "%s: unexpected argument %s to the %s option\n",
                                caller, val, token);
                        return -EINVAL;
                }
        }
        printk(KERN_INFO "%s: Unrecognized mount option %s\n", caller, token);
        return -EOPNOTSUPP;
}