The UprintC component uses the uprintf() function.  The MSP430 libc provides
uprintf(), which can be trivially created for any other platform.  The benefits
of uprintf are:

* No internal buffer; data are written as the format string is parsed.
* By using a pointer to a putc() function, the function is usable for
  multiple UARTs, when appropriate.

An example of using UprintC is shown below.

configuration AppC {
  ...
  components PlatformUartC as UartC;
  AppP.UartResource -> UartC;
  AppP.UartByte -> UartC;

  components new UprintC();
  AppP.Uprint -> UprintC;
  UprintC.UartByte  -> UartC;
  ...
}

module AppP {
  ...
  #define cprintf(fmt, args...) uprintf(call Uprint.uptr(), fmt, ## args)
  ...
  cprintf("Hello, world!\r\n");
  ...
}