ttty(7)ttty(7)NAMEttty - 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 environ‐
ment. 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 char‐
acters. 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 delim‐
ited 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 his‐
tory 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)ttty(7)
