ttty - Thai terminal driver
#include <sys/aioctl.h>
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 [Toc] [Back]
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 [Toc] [Back]
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 [Toc] [Back]
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 [Toc] [Back]
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 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.
Commands: stty(1)
Functions: ioctl(2)
Files: tty(7)
Others: Thai(5), Wototo(5)
ttty(7)
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