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  CINP-CNT

  .  Summary

  cinp_cnt();

  .  Description

  The cinp_cnt function returns the number of characters waiting in
  the received data communications buffer.

  .  Return Value

  An integer value as described above.

  .  Examples

  if (cinp_cnt() > 10)   // if more than 10 chars waiting
   handle_stuff();       //   do action

  while (!cinp_cnt())    // loop until no chars available
   ;

  if (cinp_cnt())        // if something available, get it
   c = cgetc();