#ifndef OPT_H
#define OPT_H

struct option {
	const char *name;
	unsigned int has_arg : 1;
};

enum {
	OPT_ERROR_SUCCESS,
	OPT_ERROR_UNRECOGNIZED_OPTION,
	OPT_ERROR_AMBIGUOUS_OPTION,
	OPT_ERROR_MISSING_ARGUMENT,
	OPT_ERROR_UNKNOWN,
	OPT_NR_ERRORS
};

/*
 * *argsp:
 *   points to command line arguments
 *   args[0] is the first argument (not program name)
 *
 * options:
 *   array of struct option. terminated with { NULL, 0 }
 *
 * option_handler:
 *   arguments:
 *     opt - index to options array
 *     arg - argument to the option or NULL
 *   returns 0 on success, -1 on error
 *
 * error_handler:
 *   if NULL then standard error handler is used
 *   arguments:
 *     args - command line arguments (args[0] is where the error is)
 *     error - OPT_ERROR_*
 *
 * returns number of arguments parsed
 */
int options_parse(char ***argsp, const struct option *options,
		int (*option_handler)(int opt, const char *arg),
		int (*error_handler)(char **args, int error));

#endif