Allow user to quit in menu screen; better error handling.

I set up a try-catch to catch the exception thrown by the Server/Client when
it can't create a socket. I also used display_and_exit() to
automatically close the window after the text has been displayed.

main.cpp

@@ -17,6 +17,7 @@
 #include <cmath>
 #include <cstring>
 #include <ctime>
+#include <cerrno>
 #include <sstream>
 #include "includes/raylib-cpp/raylib-cpp.hpp"
 
@@ -243,6 +244,10 @@ int main(int argc, char** argv) {
 		bool button_pressed = false; // Indicates whether the submit button has been pressed
 		
 		while (button_pressed == false) {
+			if (WindowShouldClose()) {
+				CloseWindow();
+				return 0;
+			}
 			BeginDrawing();
 				ClearBackground(BLACK);
 				GuiLabel(Rectangle{(WIDTH/2)-(label_size.x/2), (HEIGHT/8), label_size.x, label_size.y}, text_to_display); // Label to display text on top
@@ -285,6 +290,11 @@ int main(int argc, char** argv) {
 			bool editing_ip = false; // Indicates whether the IP address text box is being edited
 			bool editing_port = false; // Indicates whether the port text box is being edited
 			while (button_pressed == false || ((strlen(ip_text) == 0) || (strlen(port_text) == 0))) {
+				if (WindowShouldClose()) {
+					CloseWindow();
+					return 0;
+				}
+				
 				BeginDrawing();
 					ClearBackground(BLACK);
 					/* Label and text box for IP address */
@@ -310,11 +320,11 @@ int main(int argc, char** argv) {
 			
 			try {
 				type = check_server(ip_text, port_text);
+			} catch (int e) {
+				display_and_exit(std::string(std::strerror(e)) + "\nClosing game...", 2); // The server constructor throws the errno if it cannot create a socket
+				return -1;
 			} catch (std::invalid_argument& inv) {
-				display_text_centered(std::string(inv.what()) + "\nClosing game...");
+				display_and_exit(std::string(inv.what()) + "\nClosing game...", 2);
-				Timer timer = timer_init(2); // Wait for two seconds
-				while (!timer_done(timer));
-				CloseWindow(); // Close and exit
 				return -1;
 			}
 			free(ip_text);
@@ -327,6 +337,11 @@ int main(int argc, char** argv) {
 			const char* code_label = "Enter code:";
 			bool editing_code = false; // Indicates whether the port text box is being edited
 			while (button_pressed == false || ((strlen(code_text) == 0))) {
+				if (WindowShouldClose()) {
+					CloseWindow();
+					return 0;
+				}
+				
 				BeginDrawing();
 					ClearBackground(BLACK);
 					/* Label and text box for IP address */
@@ -339,8 +354,12 @@ int main(int argc, char** argv) {
 					button_pressed = GuiButton(Rectangle{(WIDTH/2) - (box_size.x/2), (HEIGHT/2) + (HEIGHT/6), box_size.x, box_size.y}, "Connect");
 				EndDrawing();
 			}
-			
+			try {
 				type = check_client(code_text);
+			} catch (int e) {
+				display_and_exit(std::string(std::strerror(e)) + "\nClosing game...", 2); // The client constructor throws the errno if it cannot create a socket
+				return -1;
+			}
 			free(code_text);		
 		}
 	}