Fix some memory leaks and code style issues

Maximum line length is 95 characters.
Some members' name are changed.
Struct initialisations use brace syntax; eliminating the usage of the memset function.
Iterations use for-each-loop instead of while-loop+iterator.
char * -> std::string
button_info * -> std::shared_ptr<button_info>

src/client/inputhandler.cpp

@@ -104,7 +104,7 @@ bool MyEventReceiver::OnEvent(const SEvent &event)
 	if (isMenuActive()) {
 #ifdef HAVE_TOUCHSCREENGUI
 		if (m_touchscreengui) {
-			m_touchscreengui->Toggle(false);
+			m_touchscreengui->setVisible(false);
 		}
 #endif
 		return g_menumgr.preprocessEvent(event);

src/gui/touchscreengui.h

@@ -60,15 +60,6 @@ typedef enum
 	joystick_center_id
 } touch_gui_button_id;
 
-typedef enum
-{
-	j_forward = 0,
-	j_backward,
-	j_left,
-	j_right,
-	j_aux1
-} touch_gui_joystick_move_id;
-
 typedef enum
 {
 	AHBB_Dir_Top_Bottom,
@@ -82,24 +73,24 @@ typedef enum
 #define SETTINGS_BAR_Y_OFFSET 5
 #define RARE_CONTROLS_BAR_Y_OFFSET 5
 
-// Very slow button repeat frequency
-#define SLOW_BUTTON_REPEAT 1.0f
-
-extern const char *button_imagenames[];
-extern const char *joystick_imagenames[];
+extern const std::string button_image_names[];
+extern const std::string joystick_image_names[];
 
 struct button_info
 {
-	float repeatcounter;
-	float repeatdelay;
-	irr::EKEY_CODE keycode;
+	float repeat_counter;
+	float repeat_delay;
+	EKEY_CODE keycode;
 	std::vector<size_t> ids;
-	IGUIButton *guibutton = nullptr;
+	IGUIButton *gui_button = nullptr;
 	bool immediate_release;
 
-	// 0: false, 1: (true) first texture, 2: (true) second texture
-	int togglable = 0;
-	std::vector<const char *> textures;
+	enum {
+		NOT_TOGGLEABLE,
+		FIRST_TEXTURE,
+		SECOND_TEXTURE
+	} toggleable = NOT_TOGGLEABLE;
+	std::vector<const std::string> textures;
 };
 
 class AutoHideButtonBar
@@ -107,7 +98,7 @@ class AutoHideButtonBar
 public:
 	AutoHideButtonBar(IrrlichtDevice *device, IEventReceiver *receiver);
 
-	void init(ISimpleTextureSource *tsrc, const char *starter_img, int button_id,
+	void init(ISimpleTextureSource *tsrc, const std::string &starter_img, int button_id,
 			const v2s32 &UpperLeft, const v2s32 &LowerRight,
 			autohide_button_bar_dir dir, float timeout);
 
@@ -115,13 +106,13 @@ public:
 
 	// add button to be shown
 	void addButton(touch_gui_button_id id, const wchar_t *caption,
-			const char *btn_image);
+			const std::string &btn_image);
 
 	// add toggle button to be shown
 	void addToggleButton(touch_gui_button_id id, const wchar_t *caption,
-			const char *btn_image_1, const char *btn_image_2);
+			const std::string &btn_image_1, const std::string &btn_image_2);
 
-	// detect settings bar button events
+	// detect button bar button events
 	bool isButton(const SEvent &event);
 
 	// step handler
@@ -130,7 +121,7 @@ public:
 	// return whether the button bar is active
 	bool active() { return m_active; }
 
-	// deactivate button bar
+	// deactivate the button bar
 	void deactivate();
 
 	// hide the whole button bar
@@ -145,17 +136,16 @@ private:
 	IGUIEnvironment *m_guienv;
 	IEventReceiver *m_receiver;
 	button_info m_starter;
-	std::vector<button_info *> m_buttons;
+	std::vector<std::shared_ptr<button_info>> m_buttons;
 
 	v2s32 m_upper_left;
 	v2s32 m_lower_right;
 
-	// show settings bar
+	// show button bar
 	bool m_active = false;
-
 	bool m_visible = true;
 
-	// settings bar timeout
+	// button bar timeout
 	float m_timeout = 0.0f;
 	float m_timeout_value = 3.0f;
 	bool m_initialized = false;
@@ -181,7 +171,7 @@ public:
 
 	double getPitch() { return m_camera_pitch; }
 
-	/*
+	/**
 	 * Returns a line which describes what the player is pointing at.
 	 * The starting point and looking direction are significant,
 	 * the line should be scaled to match its length to the actual distance
@@ -198,8 +188,8 @@ public:
 	void resetHud();
 	void registerHudItem(int index, const rect<s32> &rect);
 	inline void setUseCrosshair(bool use_crosshair) { m_draw_crosshair = use_crosshair; }
-	void Toggle(bool visible);
 
+	void setVisible(bool visible);
 	void hide();
 	void show();
 
@@ -213,16 +203,15 @@ private:
 	s32 button_size;
 	double m_touchscreen_threshold;
 	std::map<int, rect<s32>> m_hud_rects;
-	std::map<size_t, irr::EKEY_CODE> m_hud_ids;
-	bool m_visible; // is the gui visible
+	std::map<size_t, EKEY_CODE> m_hud_ids;
+	bool m_visible; // is the whole touch screen gui visible
 
 	// value in degree
 	double m_camera_yaw_change = 0.0;
 	double m_camera_pitch = 0.0;
 
-	/*
-	 * A line starting at the camera and pointing towards the
-	 * selected object.
+	/**
+	 * A line starting at the camera and pointing towards the selected object.
 	 * The line ends on the camera's far plane.
 	 * The coordinates do not contain the camera offset.
 	 */
@@ -244,9 +233,9 @@ private:
 	bool m_fixed_joystick = false;
 	bool m_joystick_triggers_aux1 = false;
 	bool m_draw_crosshair = false;
-	button_info *m_joystick_btn_off = nullptr;
-	button_info *m_joystick_btn_bg = nullptr;
-	button_info *m_joystick_btn_center = nullptr;
+	std::shared_ptr<button_info> m_joystick_btn_off = nullptr;
+	std::shared_ptr<button_info> m_joystick_btn_bg = nullptr;
+	std::shared_ptr<button_info> m_joystick_btn_center = nullptr;
 
 	button_info m_buttons[after_last_element_id];
 
@@ -265,7 +254,7 @@ private:
 			float repeat_delay = BUTTON_REPEAT_DELAY);
 
 	// initialize a joystick button
-	button_info *initJoystickButton(touch_gui_button_id id,
+	std::shared_ptr<button_info> initJoystickButton(touch_gui_button_id id,
 			const rect<s32> &button_rect, int texture_id,
 			bool visible = true);
 
@@ -295,13 +284,13 @@ private:
 	void applyJoystickStatus();
 
 	// array for saving last known position of a pointer
-	std::map<size_t, v2s32> m_pointerpos;
+	std::map<size_t, v2s32> m_pointer_pos;
 
 	// settings bar
-	AutoHideButtonBar m_settingsbar;
+	AutoHideButtonBar m_settings_bar;
 
 	// rare controls bar
-	AutoHideButtonBar m_rarecontrolsbar;
+	AutoHideButtonBar m_rare_controls_bar;
 };
 
 extern TouchScreenGUI *g_touchscreengui;