use arraylist in eventmanager

c_os/user/event/KeyEventManager.cc

@@ -2,13 +2,12 @@
 #include "kernel/Globals.h"
 
 void KeyEventManager::subscribe(KeyEventListener& listener) {
-    this->listeners[this->num_subscribed] = &listener;
-    this->num_subscribed = this->num_subscribed + 1;
+    this->listeners.insert(&listener);
 }
 
 void KeyEventManager::broadcast(char c) {
-    for (unsigned int i = 0; i < this->num_subscribed; ++i) {
-        this->listeners[i]->trigger(c);  // Sets lastChar, do this before wakeup
-        scheduler.deblock(&this->listeners[i]->thread);
+    for (KeyEventListener* listener : this->listeners) {
+        listener->trigger(c);
+        scheduler.deblock(&listener->thread);
     }
 }

c_os/user/event/KeyEventManager.h

@@ -2,6 +2,7 @@
 #define __KeyEventManager_Include_H_
 
 #include "user/event/KeyEventListener.h"
+#include "user/lib/ArrayList.h"
 
 // NOTE: Could do this more generally but we only have key events
 
@@ -9,9 +10,7 @@ class KeyEventManager {
 private:
     KeyEventManager(const KeyEventManager& copy) = delete;
 
-    // TODO: Implement some sort of set structure
-    KeyEventListener* listeners[16];  // This is pretty limited but should be enough
-    unsigned int num_subscribed = 0;
+    ArrayList<KeyEventListener*> listeners;
 
 public:
     KeyEventManager() {}