xref: /freebsd/sys/teken/libteken/teken.3 (revision 92223bddedf0f8b964a62904f065b12563db8ae9)

.\" Copyright (c) 2011 Ed Schouten <ed@FreeBSD.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.Dd Mar 13, 2017
.Dt TEKEN 3
.Os
.Sh NAME
.Nm teken
.Nd xterm-like terminal emulation interface
.Sh LIBRARY
.Lb libteken
.Sh SYNOPSIS
.In teken.h
.Ft void
.Fn teken_init "teken_t *t" "const teken_funcs_t *funcs" "void *thunk"
.Ft void
.Fn teken_input "teken_t *t" "const void *buf" "size_t nbytes"
.Ft const teken_pos_t *
.Fn teken_get_winsize "teken_t *t"
.Ft void
.Fn teken_set_winsize "teken_t *t" "const teken_pos_t *size"
.Ft const teken_pos_t *
.Fn teken_get_cursor "const teken_t *t"
.Ft void
.Fn teken_set_cursor "teken_t *t" "const teken_pos_t *pos"
.Ft const teken_attr_t *
.Fn teken_get_curattr "const teken_t *t"
.Ft void
.Fn teken_set_curattr "teken_t *t" "const teken_attr_t *attr"
.Ft const teken_attr_t *
.Fn teken_get_defattr "const teken_t *t"
.Ft void
.Fn teken_set_defattr "teken_t *t" "const teken_attr_t *attr"
.Ft const char *
.Fn teken_get_sequence "const teken_t *t" "unsigned int id"
.Ft teken_color_t
.Fn teken_256to16 "teken_color_t color"
.Ft teken_color_t
.Fn teken_256to8 "teken_color_t color"
.Ft void
.Fn teken_get_defattr_cons25 "const teken_t *t" "int *fg" "int *bg"
.Ft void
.Fn teken_set_8bit "teken_t *t"
.Ft void
.Fn teken_set_cons25 "teken_t *t"
.Sh DESCRIPTION
The
.Nm
library implements the input parser of a 256-color xterm-like terminal.
It converts a stream of UTF-8 encoded characters into a series of
primitive drawing instructions that can be used by a console driver or
terminal emulator to render a terminal application.
.Pp
The
.Fn teken_init
function is used to initialize terminal state object
.Fa t ,
having type
.Vt teken_t .
The supplied
.Vt teken_funcs_t
structure
.Fa funcs
contains a set of callback functions, which are called when supplying
data to
.Fn teken_input .
The
.Fa thunk
argument stores an arbitrary pointer, which is passed to each invocation
of the callback functions.
.Pp
The
.Vt teken_funcs_t
structure stores the following callbacks:
.Bd -literal -offset indent
typedef struct {
	tf_bell_t     *tf_bell;     /* Audible/visible bell. */
	tf_cursor_t   *tf_cursor;   /* Move cursor to x/y. */
	tf_putchar_t  *tf_putchar;  /* Put Unicode character at x/y. */
	tf_fill_t     *tf_fill;     /* Fill rectangle with character. */
	tf_copy_t     *tf_copy;     /* Copy rectangle to new location. */
	tf_param_t    *tf_param;    /* Miscellaneous options. */
	tf_respond_t  *tf_respond;  /* Send response string to user. */
} teken_funcs_t;
.Ed
.Pp
All callbacks must be provided, though unimplemented callbacks may some
times be sufficient.
The actual types of these callbacks can be found in
.In teken.h .
.Pp
By default,
.Fn teken_init
initializes the
.Vt teken_t
structure to emulate a terminal having 24 rows and 80 columns.
The
.Fn teken_get_winsize
and
.Fn teken_set_winsize
functions can be used to obtain and modify the dimensions of the
terminal.
.Pp
Even though the cursor position is normally controlled by input of data
through
.Fn teken_input
and returned by the
.Fn tf_cursor
callback, it can be obtained and modified manually using the
.Fn teken_get_cursor
and
.Fn teken_set_cursor
functions.
The same holds for
.Fn teken_get_curattr
and
.Fn teken_set_curattr ,
which can be used to change the currently selected font attributes and
foreground and background color.
.Pp
By default,
.Nm
emulates a white-on-black terminal, which means the default foreground
color is white, while the background color is black.
These defaults can be modified using
.Fn teken_get_defattr
and
.Fn teken_set_defattr .
.Pp
The
.Fn teken_get_sequence
function is a utility function that can be used to obtain escape
sequences of special keyboard keys, generated by user input.
The
.Fa id
parameter must be one of the
.Dv TKEY_*
parameters listed in
.In teken.h .
.Sh LEGACY FEATURES
This library also provides a set of functions that shouldn't be used in
any modern applications.
.Pp
The
.Fn teken_256to16
function converts an xterm-256 256-color code to an xterm 16-color code
whose color with default palettes is as similar as possible (not very
similar).
The lower 3 bits of the result are the ANSI color and the next lowest
bit is brightness.
Other layers (hardare and software) that only support 16 colors can use
this to avoid knowing the details of 256-color codes.
.Pp
The
.Fn teken_256to8
function is similar to
.Fn teken_256to16
except it converts to an ANSI 8-color code.
This is more accurate than discarding the brigtness bit in the result of
.Fn teken_256to16 .
.Pp
The
.Fn teken_get_defattr_cons25
function obtains the default terminal attributes as a pair of foreground
and background colors, using ANSI color numbering.
.Pp
The
.Fn teken_set_8bit
function disables UTF-8 processing and switches to 8-bit character mode,
which can be used to support character sets like CP437 and ISO-8859-1.
.Pp
The
.Fn teken_set_cons25
function switches terminal emulation to
.Dv cons25 ,
which is used by versions of
.Fx
prior to 9.0.
.Sh SEE ALSO
.Xr ncurses 3 ,
.Xr termcap 3 ,
.Xr syscons 4
.Sh HISTORY
The
.Nm
library appeared in
.Fx 8.0 ,
though it was only available and used inside the kernel.
In
.Fx 9.0 ,
the
.Nm
library appeared in userspace.
.Sh AUTHORS
.An Ed Schouten Aq ed@FreeBSD.org
.Sh SECURITY CONSIDERATIONS
The
.Fn tf_respond
callback is used to respond to device status requests commands generated
by an application.
In the past, there have been various security issues, where a malicious
application sends a device status request before termination, causing
the generated response to be interpreted by applications such as
.Xr sh 1 .
.Pp
.Nm
only implements a small subset of responses which are unlikely to cause
any harm.
Still, it is advised to leave
.Fn tf_respond
unimplemented.