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41 lines
1.5 KiB
41 lines
1.5 KiB
#ifndef MESSAGE_H_
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#define MESSAGE_H_
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#include <stdbool.h>
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#include <stdint.h>
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#include "types.h"
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// max_message_length = sender_id 4 chars
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// + underscore 1 char
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// + receiver_id 4 chars
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// + underscore 1 char
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// + time-stamp 10 chars
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// + underscore 1 char
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// + message_text 256 chars (max)
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// = 277 chars
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#define MAX_MESSAGE_LENGTH 277
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// Message structure
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typedef struct message_t message_t;
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// and handle type
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typedef message_t *message_handle_t;
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// Initializes a message structure and returns the message handle. User must provide the length of
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// the message without the null termination character (strlen);
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message_handle_t message_init(const char *message, uint16_t length, node_id_t received_from);
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// Frees a message structure.
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void message_free(message_handle_t message_handle);
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// Adds an new receiver to the message.
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void message_add_sent_to(message_handle_t message_handle, node_id_t sent_to);
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// Returns the message. This functions returns a string in a statically allocated buffer, which
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// subsequent calls will overwrite!
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char *message_get(message_handle_t message_handle, int *message_length);
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// Returns true if the message has been previously sent to this ip, false otherwise.
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bool message_sent_to(message_handle_t message_handle, node_id_t id);
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#endif //MESSAGE_H_
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