Use void as argument for parameterless functions

src/queues.c

@@ -35,19 +35,19 @@ void queues_displayed_limit(unsigned int limit)
 }
 
 /* misc getter functions */
-const GList *queues_get_displayed()
+const GList *queues_get_displayed(void)
 {
         return g_queue_peek_head_link(displayed);
 }
-unsigned int queues_length_waiting()
+unsigned int queues_length_waiting(void)
 {
         return waiting->length;
 }
-unsigned int queues_length_displayed()
+unsigned int queues_length_displayed(void)
 {
         return displayed->length;
 }
-unsigned int queues_length_history()
+unsigned int queues_length_history(void)
 {
         return history->length;
 }
@@ -292,7 +292,7 @@ void queues_check_timeouts(bool idle)
         }
 }
 
-void queues_update()
+void queues_update(void)
 {
         if (pause_displayed) {
                 while (displayed->length > 0) {

src/queues.h

@@ -20,15 +20,15 @@ void queues_displayed_limit(unsigned int limit);
 /*
  * Return read only list of notifications
  */
-const GList *queues_get_displayed();
+const GList *queues_get_displayed(void);
 
 /*
  * Returns the current amount of notifications,
  * which are shown, waiting or already in history
  */
-unsigned int queues_length_waiting();
-unsigned int queues_length_displayed();
-unsigned int queues_length_history();
+unsigned int queues_length_waiting(void);
+unsigned int queues_length_displayed(void);
+unsigned int queues_length_history(void);
 
 /*
  * Insert a fully initialized notification into queues
@@ -98,7 +98,7 @@ void queues_check_timeouts(bool idle);
  * and show them. In displayed queue, the amount of elements is limited
  * to the amount set via queues_displayed_limit
  */
-void queues_update();
+void queues_update(void);
 
 /*
  * Return the distance to the next event in the queue,

src/x11/screen.c

@@ -29,16 +29,16 @@ int randr_event_base = 0;
 static int randr_major_version = 0;
 static int randr_minor_version = 0;
 
-void randr_init();
-void randr_update();
-void xinerama_update();
-void screen_update_fallback();
+void randr_init(void);
+void randr_update(void);
+void xinerama_update(void);
+void screen_update_fallback(void);
 static void x_follow_setup_error_handler(void);
 static int x_follow_tear_down_error_handler(void);
 static int FollowXErrorHandler(Display *display, XErrorEvent *e);
 static Window get_focused_window(void);
 
-static double get_xft_dpi_value()
+static double get_xft_dpi_value(void)
 {
         static double dpi = -1;
         //Only run this once, we don't expect dpi changes during runtime
@@ -65,7 +65,7 @@ static double get_xft_dpi_value()
         return dpi;
 }
 
-void init_screens()
+void init_screens(void)
 {
         if (!settings.force_xinerama) {
                 randr_init();
@@ -87,7 +87,7 @@ void alloc_screen_ar(int n)
         screens_len = n;
 }
 
-void randr_init()
+void randr_init(void)
 {
         int randr_error_base = 0;
         if (!XRRQueryExtension(xctx.dpy, &randr_event_base, &randr_error_base)) {
@@ -99,7 +99,7 @@ void randr_init()
         XRRSelectInput(xctx.dpy, RootWindow(xctx.dpy, DefaultScreen(xctx.dpy)), RRScreenChangeNotifyMask);
 }
 
-void randr_update()
+void randr_update(void)
 {
         if (randr_major_version < 1
             || (randr_major_version == 1 && randr_minor_version < 5)) {
@@ -148,7 +148,7 @@ void screen_check_event(XEvent event)
                 randr_update();
 }
 
-void xinerama_update()
+void xinerama_update(void)
 {
         int n;
         XineramaScreenInfo *info = XineramaQueryScreens(xctx.dpy, &n);
@@ -172,7 +172,7 @@ void xinerama_update()
         XFree(info);
 }
 
-void screen_update_fallback()
+void screen_update_fallback(void)
 {
         alloc_screen_ar(1);
 
@@ -190,7 +190,7 @@ void screen_update_fallback()
  * Select the screen on which the Window
  * should be displayed.
  */
-screen_info *get_active_screen()
+screen_info *get_active_screen(void)
 {
         int ret = 0;
         if (settings.monitor > 0 && settings.monitor < screens_len) {

src/x11/screen.h

@@ -21,10 +21,10 @@ typedef struct _screen_info {
         dimension_t dim;
 } screen_info;
 
-void init_screens();
+void init_screens(void);
 void screen_check_event(XEvent event);
 
-screen_info *get_active_screen();
+screen_info *get_active_screen(void);
 double get_dpi_for_screen(screen_info *scr);
 
 #endif

src/x11/x.c

@@ -773,7 +773,7 @@ static void setopacity(Window win, unsigned long opacity)
 /*
  * Returns the modifier which is NumLock.
  */
-static KeySym x_numlock_mod()
+static KeySym x_numlock_mod(void)
 {
         static KeyCode nl = 0;
         KeySym sym = 0;
@@ -1199,7 +1199,7 @@ void x_win_show(void)
 /*
  * Hide the window and ungrab unused keyboard_shortcuts
  */
-void x_win_hide()
+void x_win_hide(void)
 {
         x_shortcut_ungrab(&settings.close_ks);
         x_shortcut_ungrab(&settings.close_all_ks);