rename error_hangling to error. Also add the needed SDL code in main.c

src/error.c

@@ -1,4 +1,4 @@
-#include "error_handling.h"
+#include "error.h"
 
 #include <stdarg.h>
 #include <stdint.h>

src/game/game.c

@@ -1,6 +1,6 @@
 #include "game.h"
 
-#include "../error_handling.h"
+#include "../error.h"
 
 void game_init(game_data* dat) {
     (void)dat;

src/main.c

@@ -1,23 +1,47 @@
+#include <SDL.h>
+#include <SDL_error.h>
+#include <SDL_events.h>
 #include <stdint.h>
+#include <stdlib.h>
 
-#include "error_handling.h"
+#include "error.h"
 #include "game/game.h"
 #include "window/render.h"
 
 static game_data gdat;   // initialized in init(), reading beforehand is undefined behaviour
 static render_data rdat; // initialized in init(), reading beforehand is undefined behaviour
 
+// initialize the game
 static void init(void) {
+    // initialize SDL
+    if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0)
+        error(ERROR_SDL_INIT, "SDL could not initialize! SDL Error: %s", SDL_GetError());
+
+    // initialize other game components
     game_init(&gdat);
     render_init(&rdat, &gdat);
 }
 
+// perform the updates to the game
 static void update(void) {
+    // update the input
+    {
+        SDL_Event e;
+        while (SDL_PollEvent(&e)) {
+            switch (e.type) {
+            case SDL_QUIT:
+                exit(STATUS_SUCCESS);
+                break;
+            }
+        }
+    }
+
     // perform updates
     game_update(&gdat);
     render_update(&rdat);
 }
 
+// entry-point of the application
 int32_t main(int32_t argc, char** argv) {
     (void)argc, (void)argv;
 

src/window/render.c

@@ -1,6 +1,6 @@
 #include "render.h"
 
-#include "../error_handling.h"
+#include "../error.h"
 #include "../game/game.h"
 
 void render_init(render_data* const rdat, game_data const* const gdat) {