getopt.c

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/*
 * getopt.c
 */

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

#include <asm/errno.h>

#include "getopt.h"

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;
}