(svn r8174) -Backport from trunk (r8027, r8028, r8043, r8132):

- (FS#486) pause command issues with shift-pressed did not pause the game, interference with pause_on_join (r8027)
 - overflow of ticks was not handled properly, possibly resulting a non-reacting gameserver/gameclient (r8028, r8043)
 - The game could crash when the chat key (<ENTER>) is pressed too quickly during join (r8132)

command.c

@@ -463,7 +463,11 @@ bool DoCommandP(TileIndex tile, uint32 p1, uint32 p2, CommandCallback *callback,
 	_docommand_recursive = 1;
 
 	// cost estimation only?
-	if (!IsGeneratingWorld() && _shift_pressed && IsLocalPlayer() && !(cmd & (CMD_NETWORK_COMMAND | CMD_SHOW_NO_ERROR))) {
+	if (!IsGeneratingWorld() &&
+			_shift_pressed &&
+			IsLocalPlayer() &&
+			!(cmd & (CMD_NETWORK_COMMAND | CMD_SHOW_NO_ERROR)) &&
+			(cmd & 0xFF) != CMD_PAUSE) {
 		// estimate the cost.
 		res = proc(tile, flags, p1, p2);
 		if (CmdFailed(res)) {

main_gui.c

@@ -2308,6 +2308,8 @@ static void MainWindowWndProc(Window *w, WindowEvent *e)
 					const NetworkClientInfo *cio = NetworkFindClientInfoFromIndex(_network_own_client_index);
 					bool teamchat = false;
 
+					if (cio == NULL) break;
+
 					/* Only players actually playing can speak to team. Eg spectators cannot */
 					if (_patches.prefer_teamchat && IsValidPlayer(cio->client_playas)) {
 						const NetworkClientInfo *ci;
@@ -2329,8 +2331,10 @@ static void MainWindowWndProc(Window *w, WindowEvent *e)
 
 			case WKC_CTRL | WKC_RETURN: case WKC_CTRL | 'T': // send text to all team mates
 				if (_networking) {
-					const NetworkClientInfo *ci = NetworkFindClientInfoFromIndex(_network_own_client_index);
+					const NetworkClientInfo *cio = NetworkFindClientInfoFromIndex(_network_own_client_index);
-					ShowNetworkChatQueryWindow(DESTTYPE_TEAM, ci->client_playas);
+					if (cio == NULL) break;
+
+					ShowNetworkChatQueryWindow(DESTTYPE_TEAM, cio->client_playas);
 				}
 				break;
 #endif

video/cocoa_v.m

@@ -652,8 +652,8 @@ static bool QZ_PollEvent(void)
 
 static void QZ_GameLoop(void)
 {
-	uint32 next_tick = GetTick() + 30;
+	uint32 cur_ticks = GetTick();
-	uint32 cur_ticks;
+	uint32 next_tick = cur_ticks + 30;
 	uint32 pal_tick = 0;
 #ifdef _DEBUG
 	uint32 et0, et, st0, st;
@@ -682,6 +682,7 @@ static void QZ_GameLoop(void)
 	CSleep(1);
 
 	for (;;) {
+		uint32 prev_cur_ticks = cur_ticks; // to check for wrapping
 		InteractiveRandom(); // randomness
 
 		while (QZ_PollEvent()) {}
@@ -700,11 +701,8 @@ static void QZ_GameLoop(void)
 		}
 
 		cur_ticks = GetTick();
-		if ((_fast_forward && !_pause) || cur_ticks > next_tick)
+		if (cur_ticks >= next_tick || (_fast_forward && !_pause) || cur_ticks < prev_cur_ticks) {
-			next_tick = cur_ticks;
+			next_tick = cur_ticks + 30;
-
-		if (cur_ticks == next_tick) {
-			next_tick += 30;
 
 			_ctrl_pressed = !!(_cocoa_video_data.current_mods & NSControlKeyMask);
 			_shift_pressed = !!(_cocoa_video_data.current_mods & NSShiftKeyMask);

video/dedicated_v.c

@@ -224,10 +224,8 @@ static void DedicatedHandleKeyInput(void)
 
 static void DedicatedVideoMainLoop(void)
 {
-	uint32 next_tick;
+	uint32 cur_ticks = GetTime();
-	uint32 cur_ticks;
+	uint32 next_tick = cur_ticks + 30;
-
-	next_tick = GetTime() + 30;
 
 	/* Signal handlers */
 #ifdef UNIX
@@ -269,15 +267,15 @@ static void DedicatedVideoMainLoop(void)
 	}
 
 	while (!_exit_game) {
+		uint32 prev_cur_ticks = cur_ticks; // to check for wrapping
 		InteractiveRandom(); // randomness
 
 		if (!_dedicated_forks)
 			DedicatedHandleKeyInput();
 
 		cur_ticks = GetTime();
-
+		if (cur_ticks >= next_tick || cur_ticks < prev_cur_ticks) {
-		if (cur_ticks >= next_tick) {
+			next_tick = cur_ticks + 30;
-			next_tick += 30;
 
 			GameLoop();
 			_screen.dst_ptr = _dedicated_video_mem;

video/sdl_v.c

@@ -422,14 +422,15 @@ static void SdlVideoStop(void)
 
 static void SdlVideoMainLoop(void)
 {
-	uint32 next_tick = SDL_CALL SDL_GetTicks() + 30;
+	uint32 cur_ticks = SDL_CALL SDL_GetTicks();
-	uint32 cur_ticks;
+	uint32 next_tick = cur_ticks + 30;
 	uint32 pal_tick = 0;
 	uint32 mod;
 	int numkeys;
 	Uint8 *keys;
 
 	for (;;) {
+		uint32 prev_cur_ticks = cur_ticks; // to check for wrapping
 		InteractiveRandom(); // randomness
 
 		while (PollEvent() == -1) {}
@@ -451,11 +452,8 @@ static void SdlVideoMainLoop(void)
 		}
 
 		cur_ticks = SDL_CALL SDL_GetTicks();
-		if ((_fast_forward && !_pause) || cur_ticks > next_tick)
+		if (cur_ticks >= next_tick || (_fast_forward && !_pause) || cur_ticks < prev_cur_ticks) {
-			next_tick = cur_ticks;
+			next_tick = cur_ticks + 30;
-
-		if (cur_ticks == next_tick) {
-			next_tick += 30;
 
 			_ctrl_pressed  = !!(mod & KMOD_CTRL);
 			_shift_pressed = !!(mod & KMOD_SHIFT);

video/win32_v.c

@@ -786,11 +786,14 @@ static void CheckPaletteAnim(void)
 static void Win32GdiMainLoop(void)
 {
 	MSG mesg;
-	uint32 next_tick = GetTickCount() + 30, cur_ticks;
+	uint32 cur_ticks = GetTickCount();
+	uint32 next_tick = cur_ticks + 30;
 
 	_wnd.running = true;
 
 	for (;;) {
+		uint32 prev_cur_ticks = cur_ticks; // to check for wrapping
+
 		while (PeekMessage(&mesg, NULL, 0, 0, PM_REMOVE)) {
 			InteractiveRandom(); // randomness
 			DispatchMessage(&mesg);
@@ -810,11 +813,8 @@ static void Win32GdiMainLoop(void)
 		}
 
 		cur_ticks = GetTickCount();
-		if ((_fast_forward && !_pause) || cur_ticks > next_tick)
+		if (cur_ticks >= next_tick || (_fast_forward && !_pause) || cur_ticks < prev_cur_ticks) {
-			next_tick = cur_ticks;
+			next_tick = cur_ticks + 30;
-
-		if (cur_ticks == next_tick) {
-			next_tick += 30;
 			_ctrl_pressed = _wnd.has_focus && GetAsyncKeyState(VK_CONTROL)<0;
 			_shift_pressed = _wnd.has_focus && GetAsyncKeyState(VK_SHIFT)<0;
 #ifdef _DEBUG