ttty(7) 						 Miscellaneous Information Manual						   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 envi-
       ronment.  See tty(7) for a general description of terminal interfaces.  See stty(1) for information on how to activate  the  features  dis-
       cussed 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: Move to the beginning of  the  line.   Delete
       the  cell under the cursor.  Move to the end of the line.  Recall the previous command in the history list.  Recall the next command in the
       history list.  Move the cursor to the left by one cell.	Move the cursor to the right by one cell.  Delete the Thai  character  immediately
       before  the  cursor.   You can use the stty command to determine and set the character that erases a character.	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 edit-
       ing, 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.

RELATED INFORMATION

       Commands: stty(1)

       Functions: ioctl(2)

       Files: tty(7)

       Others: Thai(5), Wototo(5) delim off

																	   ttty(7)