status.h

/********************************************************************
 *
 * $Id: status.distGoal 1989 2015-10-16 18:19:52Z phil $
 *
 ********************************************************************
 */
/**
 * Minimal system for error handling.
 *
 * Each value of the "status" enum is associated with an error message.
 * Every function (but some of those returning pointers) should return a
 * status. In the case of non-void functions, the former return value has 
 * to be placed in the parameter list (by address)
 *
 ********************************************************************/

#ifndef __STATUS_H
#define __STATUS_H

typedef enum {
    OK,
    ERROPEN,
    ERRACCESS,
    ERRCLOSE,
    ERRALLOC,
    ERRDATE,
    ERRFULL,
    ERREMPTY,
    ERRABSENT,
    ERREXIST,
    ERRINDEX,
    ERRUNABLE,
    ERRADDCITY,
    ERRADDNEIGHBOUR,
    ERRMAPCONNECTIVITY,
    ERRASTAR,
    ERRUNKNOWN,
} status;

/** get message associated with the given status value (O(1)).
 * @param s the status value
 * @return the associated message
 */
extern char *message(status s);


#endif