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ttty(7)


NAME

  ttty - Thai terminal driver


SYNOPSIS

  #include <sys/aioctl.h>


DESCRIPTION

  This section describes special features supported by the Thai terminal
  driver, which is used for conversational computing in a Thai environment.
  See tty(7) for a general description of terminal interfaces.	See stty(1)
  for information on how to activate the features discussed here.

  The Thai terminal driver is available only when Tru64 UNIX optional subsets
  for worldwide support are installed. This driver also must be configured
  into the current running kernel in order for Thai support features to be
  enabled.

  Line Disciplines

  Line discipline switching to the Thai terminal driver is accomplished with
  the following TIOCSETD ioctl:

       int ldisc = THAIDISC;

       ioctl(f, TIOCSETD, &ldisc);

  Input Sequence Checking

  The Thai terminal driver supports input sequence checking that complies
  with the Wototo standard. The three different modes of input sequence
  checking are as follows:

    ·  Mode 0 (pass-through)

       No input checking is performed. This mode allows the application
       program to handle checking of the input sequence.

    ·  Mode 1 (basic check)

       This is the default mode for a Thai system.

    ·  Mode 2 (strict)

       This mode imposes additional constraints in order to reject obviously
       illegal input sequences.

  Input Reordering

  Input reordering mode, if activated, will reorder the following two types
  of Thai sequences:

    ·  L3L1L2 -> L3L2L1

    ·  L3L4L1 -> L3L1L4

  In these sequences, L1, L2, L3, and L4 are level-1, level-2, level-3, and
  level-4 characters, respectively.

  History Mode Line Editing

  The history mode of the Thai terminal driver allows users to use Emacs-like
  control codes to edit previously entered command lines. Up to 32 lines can
  be stored and each line can have a maximum width of 127 characters.
  However, short command lines, those that are fewer than three characters in
  length, are not stored in the history list.

  Depending on the editing command used, the unit of editing may be a
  character, a cell, or a word.	 A cell is one physical display column on the
  screen and may consist of one ASCII character or one to three Thai
  characters.  In this context, a word is a string of characters delimited by
  white spaces.	 The following editing commands are available in the history
  mode:

  Ctrl/A
      Move to the beginning of the line.

  Ctrl/D
      Delete the cell under the cursor.

  Ctrl/E
      Move to the end of the line.

  Up-Arrow
      Recall the previous command in the history list.

  Down-Arrow
      Recall the next command in the history list.

  Left-Arrow
      Move the cursor to the left by one cell.

  Right-Arrow
      Move the cursor to the right by one cell.

  erase-char
      Delete the Thai character immediately before the cursor. You can use
      the stty command to determine and set the character that erases a
      character.

  werase-char
      Delete the word before the cursor. You can use the stty command to
      determine and set the character that erases a word.

  Typing a normal character causes it to be inserted before the character
  under the cursor. The kill, interrupt, and suspend characters cause the
  Thai terminal driver to break out of the history mode.

  Input sequence checking and input reordering are not performed in history
  mode.	 The line-editing features support only single-line editing, not
  multiple-line editing.  For instance, if the cursor is wrapped to the
  beginning of the next line, you cannot return the cursor to the previous
  line by pressing the left arrow key.


SEE ALSO

  Commands: stty(1)

  Functions: ioctl(2)

  Files: tty(7)

  Others: Thai(5), Wototo(5)

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