authRTESFinalAssignment/lib/message.h

#ifndef MESSAGE_H_
#define MESSAGE_H_

#include <stdbool.h>
#include <stdint.h>

#include "types.h"

// max_message_length =   sender_id        4   chars
//                      + underscore       1   char
//                      + receiver_id      4   chars
//                      + underscore       1   char
//                      + time-stamp       10  chars
//                      + underscore       1   char
//                      + message_text     256 chars (max)
//                    =                    277 chars
#define MAX_MESSAGE_LENGTH 277

// Message structure
typedef struct message_t message_t;
// and handle type
typedef message_t *message_handle_t;

// Initializes a message structure and returns the message handle. User must provide the length of
// the message without the null termination character (strlen);
message_handle_t message_init(const char *message, uint16_t length, node_id_t received_from);

// Frees a message structure.
void message_free(message_handle_t message_handle);

// Adds an new receiver to the message.
void message_add_sent_to(message_handle_t message_handle, node_id_t sent_to);

// Returns the message. This functions returns a string in a statically allocated buffer, which
// subsequent calls will overwrite!
char *message_get(message_handle_t message_handle, int *message_length);

// Returns true if the message has been previously sent to this ip, false otherwise.
bool message_sent_to(message_handle_t message_handle, node_id_t id);

#endif //MESSAGE_H_