Add comGet/SetTxFlowControl functions for Win32.

Need *nix implementations now.

src/comio/comio.h

@@ -117,6 +117,8 @@ COMIOEXPORT COM_HANDLE	COMIOCALL comOpen(const char* device);
 COMIOEXPORT BOOL		COMIOCALL comClose(COM_HANDLE);
 COMIOEXPORT long		COMIOCALL comGetBaudRate(COM_HANDLE);
 COMIOEXPORT BOOL		COMIOCALL comSetBaudRate(COM_HANDLE, ulong rate);
+COMIOEXPORT BOOL		COMIOCALL comGetTxFlowControl(COM_HANDLE);
+COMIOEXPORT BOOL		COMIOCALL comSetTxFlowControl(COM_HANDLE, BOOL enable);
 COMIOEXPORT int			COMIOCALL comGetModemStatus(COM_HANDLE);
 COMIOEXPORT int			COMIOCALL comRaiseDTR(COM_HANDLE);
 COMIOEXPORT int			COMIOCALL comLowerDTR(COM_HANDLE);

src/comio/comio_win32.c

@@ -112,6 +112,28 @@ BOOL COMIOCALL comSetBaudRate(COM_HANDLE handle, unsigned long rate)
 	return SetCommState(handle, &dcb);
 }
 
+BOOL COMIOCALL comGetTxFlowControl(COM_HANDLE handle)
+{
+	DCB dcb;
+
+	if(GetCommState(handle, &dcb) != TRUE)
+		return COM_ERROR;
+
+	return dcb.fOutxCtsFlow;
+}
+
+BOOL COMIOCALL comSetTxFlowControl(COM_HANDLE handle, BOOL enable)
+{
+	DCB dcb;
+
+	if(GetCommState(handle, &dcb) != TRUE)
+		return FALSE;
+
+	dcb.fOutxCtsFlow = enable;
+
+	return SetCommState(handle, &dcb);
+}
+
 int COMIOCALL comGetModemStatus(COM_HANDLE handle)
 {
 	DWORD status=0;