Started working on receiving messages

main.c

@@ -93,48 +93,94 @@ int main() {
 						strcat(data, buffer);
 					}
 					strcat(data,"\0"); 
-					if (from_user[i] == NULL) {
-						from_user[i] = fetch_user(fetch_from_string(data,"IAM"));
+
+					if (strcmp(strtok(data," \r\n"), "SENDING") == 0) {
 						if (from_user[i] == NULL) {
-							printf("Please identify yourself.\n");
-							close(conn_sockets[i]);
-							continue;
-						} else {
-							printf("You are %s\n",from_user[i]->username);
+							from_user[i] = fetch_user(fetch_from_string(data,"IAM"));
+							if (from_user[i] == NULL) {
+								printf("Please identify yourself.\n");
+								close(conn_sockets[i]);
+								continue;
+							} else {
+								printf("You are %s\n",from_user[i]->username);
+							}
 						}
-					}
-
-					if (to_user[i] == NULL) {
-						to_user[i] = fetch_user(fetch_from_string(data,"TO"));
+	
 						if (to_user[i] == NULL) {
-							printf("Invalid user or message format.\n");
-							close(conn_sockets[i]);
-							continue;
+							to_user[i] = fetch_user(fetch_from_string(data,"TO"));
+							if (to_user[i] == NULL) {
+								printf("Invalid user or message format.\n");
+								close(conn_sockets[i]);
+								continue;
+							} else {
+								printf("Message intended for %s\n",to_user[i]->username);
+							}
+						}
+	
+						char* message_string = fetch_message_string(data);
+						if (message_string == NULL) {
+							printf("Invalid message.\n");
+							return -10;
+						}	
+	
+						printf("Your message is: %s\n",message_string);
+	
+						if (user_to_index(to_user[i]) < 0) {
+							printf("Recipient user does not exist!\n");
+							return -20;
+						}
+	
+						Message* message = new_message(message_string,from_user[i],to_user[i]);
+						stack_push( message_stack[user_to_index(to_user[i])],message );
+	
+						printf("Message has been pushed onto stack for %s\n",to_user[i]->username);
+	
+					} else if (strcmp(strtok(buffer," \r\n"), "SENDING") == 0) {
+
+                                                if (from_user[i] == NULL) {
+                                                        from_user[i] = fetch_user(fetch_from_string(data,"IAM"));
+                                                        if (from_user[i] == NULL) {
+                                                                printf("Please identify yourself.\n");
+                                                                close(conn_sockets[i]);
+                                                                continue;
+                                                        } else {
+                                                                printf("You are %s\n",from_user[i]->username);
+                                                        }
+                                                }
+
+						int num_of_messages;
+						char* num_of_messages_string = fetch_from_string(data,"GETLAST");
+
+						if (num_of_messages_string == NULL) {
+							printf("Invalid GET request.\n");
+							return -30;
 						} else {
-							printf("Message intended for %s\n",to_user[i]->username);
+							if (strstr(num_of_messages_string,"ALL") == 0) {
+								num_of_messages = stack_size(message_stack[user_to_index(from_user[i])]);
+							} else {
+								num_of_messages = atoi(num_of_messages_string);
+							}
 						}
-					}
-
-					char* message_string = fetch_message_string(data);
-					if (message_string == NULL) {
-						printf("Invalid message.\n");
-						return -10;
-					}	
 
-					printf("Your message is: %s\n",message_string);
+						if (num_of_messages > stack_size(message_stack[user_to_index(from_user[i])])) {
+							num_of_messages = stack_size(message_stack[user_to_index(from_user[i])]);
+						}
+							
+						for (int i=0;i<num_of_messages;i++) {
+							Message* message = stack_pop(message_stack[user_to_index(from_user[i])]);
+							printf("You have a message from %s"
+								", sent at %s"
+								": \"%s\"\n",
+								message->sender->username,
+								asctime(message->timeinfo),
+								message->text);
+						}
+						
 
-					if (user_to_index(to_user[i]) < 0) {
-						printf("Recipient user does not exist!\n");
-						return -20;
+					} else {
+						printf("You are not sending or receiving.\n");
 					}
 
-					Message* message = new_message(message_string,from_user[i],to_user[i]);
-					stack_push( message_stack[user_to_index(to_user[i])],message );
-
-					printf("Message has been pushed onto stack for %s\n",to_user[i]->username);
-
-					
-
 					close(conn_sockets[i]);					
 
 				}