#ifndef _COORD
#define _COORD

#include "types.h"

/*
 * Does not check if s is a valid string representing. If input is
 * untrusted, use coord_is_valid(char*) to check it.
 */

Coord coord_init(char*);

/*
 * Returns 0 if c is the null coordinate
 */
int coord_is_null(Coord);

/*
 * Returns 0 if the coordinate is between a1 and h8.
 */
int coord_is_valid(char*);

/*
 * Returns the null Coordinate
 */
Coord coord_null();

/*
 * Set Coord column
 */
Coord coord_set_col(Coord c, char col);

/*
 * Set Coord row
 */
Coord coord_set_row(Coord c, char row);

/*
 * Returns the next coordinate. Useful for traversing the board forwards.
 */
Coord coord_next(Coord);

/*
 * Returns the previous coordinate. Useful for traversing the board backwards.
 */
Coord coord_prev(Coord);

#endif