[all] use explicit void parameter lists

This makes it a compile-time error to call a function that semantically
takes no parameters with a nonzero number of arguments.

Previously, such code would still compile, but risk blowing up the stack
if a compiler chose to use something other than caller-cleanup calling
conventions.

client/clipboards/Wayland/src/wayland.c

@@ -171,7 +171,7 @@ static enum LG_ClipboardData mimetypeToCbType(const char * mimetype)
   return LG_CLIPBOARD_DATA_NONE;
 }
 
-static const char * wayland_cb_getName()
+static const char * wayland_cb_getName(void)
 {
   return "Wayland";
 }
@@ -327,7 +327,7 @@ static bool wayland_cb_init(
   return true;
 }
 
-static void wayland_cb_free()
+static void wayland_cb_free(void)
 {
   free(this);
   this = NULL;
@@ -425,7 +425,7 @@ static void wayland_cb_notice(LG_ClipboardRequestFn requestFn,
   this->requestFn(wayland_cb_reply_fn, NULL);
 }
 
-static void wayland_cb_release()
+static void wayland_cb_release(void)
 {
   this->requestFn = NULL;
 }

client/clipboards/X11/src/x11.c

@@ -57,7 +57,7 @@ static const char * atomTypes[] =
   "image/jpeg"
 };
 
-static const char * x11_cb_getName()
+static const char * x11_cb_getName(void)
 {
   return "X11";
 }
@@ -116,7 +116,7 @@ static bool x11_cb_init(
   return true;
 }
 
-static void x11_cb_free()
+static void x11_cb_free(void)
 {
   free(this);
   this = NULL;
@@ -432,7 +432,7 @@ static void x11_cb_notice(LG_ClipboardRequestFn requestFn, LG_ClipboardData type
   XFlush(this->display);
 }
 
-static void x11_cb_release()
+static void x11_cb_release(void)
 {
   this->requestFn = NULL;
   XSetSelectionOwner(this->display, XA_PRIMARY      , None, CurrentTime);

client/fonts/SDL/src/sdl.c

@@ -150,4 +150,4 @@ struct LG_Font LGF_SDL =
   .destroy      = lgf_sdl_destroy,
   .render       = lgf_sdl_render,
   .release      = lgf_sdl_release
-};
+};

client/renderers/EGL/egl.c

@@ -158,12 +158,12 @@ static struct Option egl_options[] =
 
 void update_mouse_shape(struct Inst * this);
 
-const char * egl_get_name()
+const char * egl_get_name(void)
 {
   return "EGL";
 }
 
-void egl_setup()
+void egl_setup(void)
 {
   option_register(egl_options);
 }

client/renderers/EGL/texture.c

@@ -268,7 +268,7 @@ bool egl_texture_setup(EGL_Texture * texture, enum EGL_PixelFormat pixFmt, size_
   return true;
 }
 
-static void egl_warn_slow()
+static void egl_warn_slow(void)
 {
   static bool warnDone = false;
   if (!warnDone)

client/renderers/OpenGL/opengl.c

@@ -196,12 +196,12 @@ static bool draw_frame(struct Inst * this);
 static void draw_mouse(struct Inst * this);
 static void render_wait(struct Inst * this);
 
-const char * opengl_get_name()
+const char * opengl_get_name(void)
 {
   return "OpenGL";
 }
 
-static void opengl_setup()
+static void opengl_setup(void)
 {
   option_register(opengl_options);
 }

client/src/config.c

@@ -396,7 +396,7 @@ static struct Option options[] =
   {0}
 };
 
-void config_init()
+void config_init(void)
 {
   params.center = true;
   params.w      = 1024;
@@ -514,12 +514,12 @@ bool config_load(int argc, char * argv[])
   return true;
 }
 
-void config_free()
+void config_free(void)
 {
   option_free();
 }
 
-static void doLicense()
+static void doLicense(void)
 {
   fprintf(stderr,
     "\n"

client/src/ll.c

@@ -38,7 +38,7 @@ struct ll
   LG_Lock lock;
 };
 
-struct ll * ll_new()
+struct ll * ll_new(void)
 {
   struct ll * list = malloc(sizeof(struct ll));
   list->head  = NULL;

client/src/main.c

@@ -88,7 +88,7 @@ struct AppParams params = { 0 };
 static void setGrab(bool enable);
 static void setGrabQuiet(bool enable);
 
-static void lgInit()
+static void lgInit(void)
 {
   g_state.state         = APP_STATE_RUNNING;
   g_state.resizeDone    = true;
@@ -101,13 +101,13 @@ static void lgInit()
   g_cursor.guest.valid   = false;
 }
 
-static bool inputEnabled()
+static bool inputEnabled(void)
 {
   return params.useSpiceInput && !g_state.ignoreInput &&
     ((g_cursor.grab && params.captureInputOnly) || !params.captureInputOnly);
 }
 
-static void alignToGuest()
+static void alignToGuest(void)
 {
   if (SDL_HasEvent(e_SDLEvent))
     return;
@@ -120,7 +120,7 @@ static void alignToGuest()
   SDL_PushEvent(&event);
 }
 
-static void updatePositionInfo()
+static void updatePositionInfo(void)
 {
   if (g_state.haveSrcSize)
   {
@@ -709,7 +709,7 @@ static SpiceDataType clipboard_type_to_spice_type(const LG_ClipboardData type)
   }
 }
 
-void clipboardRelease()
+void clipboardRelease(void)
 {
   if (!params.clipboardToVM)
     return;
@@ -814,7 +814,7 @@ void spiceClipboardData(const SpiceDataType type, uint8_t * buffer, uint32_t siz
   }
 }
 
-void spiceClipboardRelease()
+void spiceClipboardRelease(void)
 {
   if (!params.clipboardToLocal)
     return;
@@ -915,7 +915,7 @@ static void guestCurToLocal(struct DoublePoint *local)
 // warp support. Instead, we attempt a best-effort emulation which works with a
 // 1:1 mouse movement patch applied in the guest. For anything fancy, use
 // capture mode.
-static void handleMouseWayland()
+static void handleMouseWayland(void)
 {
   if (g_cursor.guest.dpiScale == 0)
     return;
@@ -1119,7 +1119,7 @@ static void handleResizeEvent(unsigned int w, unsigned int h)
   }
 }
 
-static void handleWindowLeave()
+static void handleWindowLeave(void)
 {
   g_cursor.inWindow = false;
   g_cursor.inView   = false;
@@ -1133,7 +1133,7 @@ static void handleWindowLeave()
   g_cursor.redraw = true;
 }
 
-static void handleWindowEnter()
+static void handleWindowEnter(void)
 {
   g_cursor.inWindow = true;
   if (!inputEnabled())
@@ -1773,7 +1773,7 @@ static void key_passthrough(SDL_Scancode key, void * opaque)
   spice_key_up  (sc);
 }
 
-static void register_key_binds()
+static void register_key_binds(void)
 {
   g_state.kbFS           = app_register_keybind(SDL_SCANCODE_F     , toggle_fullscreen, NULL);
   g_state.kbVideo        = app_register_keybind(SDL_SCANCODE_V     , toggle_video     , NULL);
@@ -1799,7 +1799,7 @@ static void register_key_binds()
   g_state.kbPass[1] = app_register_keybind(SDL_SCANCODE_RGUI, key_passthrough, NULL);
 }
 
-static void release_key_binds()
+static void release_key_binds(void)
 {
   app_release_keybind(&g_state.kbFS   );
   app_release_keybind(&g_state.kbVideo);
@@ -1813,7 +1813,7 @@ static void release_key_binds()
     app_release_keybind(&g_state.kbPass[i]);
 }
 
-static void initSDLCursor()
+static void initSDLCursor(void)
 {
   const uint8_t data[4] = {0xf, 0x9, 0x9, 0xf};
   const uint8_t mask[4] = {0xf, 0xf, 0xf, 0xf};
@@ -1821,7 +1821,7 @@ static void initSDLCursor()
   SDL_SetCursor(cursor);
 }
 
-static int lg_run()
+static int lg_run(void)
 {
   memset(&g_state, 0, sizeof(g_state));
 
@@ -2218,7 +2218,7 @@ restart:
   return 0;
 }
 
-static void lg_shutdown()
+static void lg_shutdown(void)
 {
   g_state.state = APP_STATE_SHUTDOWN;
   if (t_render)

client/src/wm.c

@@ -41,7 +41,7 @@ static void wmWaylandUngrabKeyboard();
 static void wmWaylandGrabPointer();
 static void wmWaylandUngrabPointer();
 
-void wmInit()
+void wmInit(void)
 {
   switch (g_state.wminfo.subsystem)
   {
@@ -54,7 +54,7 @@ void wmInit()
   }
 }
 
-void wmFree()
+void wmFree(void)
 {
   switch (g_state.wminfo.subsystem)
   {
@@ -67,7 +67,7 @@ void wmFree()
   }
 }
 
-void wmGrabPointer()
+void wmGrabPointer(void)
 {
   switch(g_state.wminfo.subsystem)
   {
@@ -96,7 +96,7 @@ void wmGrabPointer()
   g_wmState.pointerGrabbed = true;
 }
 
-void wmUngrabPointer()
+void wmUngrabPointer(void)
 {
   switch(g_state.wminfo.subsystem)
   {
@@ -116,7 +116,7 @@ void wmUngrabPointer()
   g_wmState.pointerGrabbed = false;
 }
 
-void wmGrabKeyboard()
+void wmGrabKeyboard(void)
 {
   switch(g_state.wminfo.subsystem)
   {
@@ -151,7 +151,7 @@ void wmGrabKeyboard()
   g_wmState.keyboardGrabbed = true;
 }
 
-void wmUngrabKeyboard()
+void wmUngrabKeyboard(void)
 {
   switch(g_state.wminfo.subsystem)
   {
@@ -174,13 +174,13 @@ void wmUngrabKeyboard()
   g_wmState.keyboardGrabbed = false;
 }
 
-void wmGrabAll()
+void wmGrabAll(void)
 {
   wmGrabPointer();
   wmGrabKeyboard();
 }
 
-void wmUngrabAll()
+void wmUngrabAll(void)
 {
   wmUngrabPointer();
   wmUngrabKeyboard();
@@ -383,7 +383,7 @@ static const struct wl_seat_listener seatListener = {
     .name = seatNameHandler,
 };
 
-void wmWaylandInit()
+void wmWaylandInit(void)
 {
   struct WMDataWayland * wm = malloc(sizeof(struct WMDataWayland));
   memset(wm, 0, sizeof(struct WMDataWayland));
@@ -418,7 +418,7 @@ static const struct zwp_relative_pointer_v1_listener relativePointerListener = {
     .relative_motion = relativePointerMotionHandler,
 };
 
-static void wmWaylandGrabPointer()
+static void wmWaylandGrabPointer(void)
 {
   struct WMDataWayland * wm = g_wmState.opaque;
 
@@ -439,7 +439,7 @@ static void wmWaylandGrabPointer()
   }
 }
 
-static void wmWaylandUngrabPointer()
+static void wmWaylandUngrabPointer(void)
 {
   struct WMDataWayland * wm = g_wmState.opaque;
 
@@ -456,7 +456,7 @@ static void wmWaylandUngrabPointer()
   }
 }
 
-static void wmWaylandGrabKeyboard()
+static void wmWaylandGrabKeyboard(void)
 {
   struct WMDataWayland * wm = g_wmState.opaque;
 
@@ -467,7 +467,7 @@ static void wmWaylandGrabKeyboard()
   }
 }
 
-static void wmWaylandUngrabKeyboard()
+static void wmWaylandUngrabKeyboard(void)
 {
   struct WMDataWayland * wm = g_wmState.opaque;
 
@@ -478,7 +478,7 @@ static void wmWaylandUngrabKeyboard()
   }
 }
 
-static void wmWaylandFree()
+static void wmWaylandFree(void)
 {
   struct WMDataWayland * wm = g_wmState.opaque;