/* MSPDebug - debugging tool for MSP430 MCUs
 * Copyright (C) 2009-2012 Daniel Beer
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#ifndef INPUT_H_
#define INPUT_H_

/* This defines the interface to an input module. The input module is
 * responsible for providing a way of fetching commands to be executed,
 * and a way of presenting yes/no questions to the user ("are you sure
 * you want to ...?").
 */
struct input_interface {
	/* Initialize/tear down the input subsystem. */
	int	(*init)(void);
	void	(*exit)(void);

	/* Read a command from the user into the supplied buffer. This
	 * function returns 0 on success, -1 if an error occurs, and 1
	 * if the end of input has been reached.
	 */
	int	(*read_command)(char *buf, int max_len);

	/* Prompt the user before performing a destructive operation.
	 * The question should be phrased so that "yes" confirms that
	 * the operation should proceed.
	 *
	 * Returns 1 for no (abort), 0 for yes (continue), and -1 if an
	 * error occurs.
	 */
	int	(*prompt_abort)(const char *message);
};

/* Variable which holds a reference to the selected input module. */
extern const struct input_interface *input_module;

#endif