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   tp_lstat() - return line status

   cStat := tp_lstat(nPort)

   nPort       Serial port number.

   Returns     Line status state string.

   The line status mask records serial input errors.  This function
   reads the status mask, clears it, and returns either an empty string
   if there were no errors or a string consisting of one or more of the
   following characters:

       "O" Input buffer overrun.
       "P" Parity error.
       "F" Framing error.
       "B" Break received.

   Example:

       if "O" $ tp_lstat(1)
           ? "Buffer overrun"
       endif