diff --git a/AUTHORS b/AUTHORS
deleted file mode 100644
index c2a4eac..0000000
--- a/AUTHORS
+++ /dev/null
@@ -1,8 +0,0 @@
-# This is the list of Fuchsia Authors.
-
-# Names should be added to this file as one of
-#     Organization's name
-#     Individual's name <submission email address>
-#     Individual's name <submission email address> <email2> <emailN>
-
-Google Inc.
diff --git a/BUILD.gn b/BUILD.gn
new file mode 100644
index 0000000..0d46c90
--- /dev/null
+++ b/BUILD.gn
@@ -0,0 +1,17 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+source_set("libteken") {
+  sources = [
+    "teken/teken.c",
+    "teken/teken.h",
+    "teken/teken_scs.h",
+    "teken/teken_state.h",
+    "teken/teken_subr.h",
+    "teken/teken_subr_compat.h",
+    "teken/teken_wcwidth.h",
+  ]
+
+  defines = [ "__unused=__attribute__((unused))" ]
+}
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
deleted file mode 100644
index 81e2938..0000000
--- a/CONTRIBUTING.md
+++ /dev/null
@@ -1,9 +0,0 @@
-This repository accepts contributions using Gerrit.
-
-Instructions for using Gerrit:
-
- * https://gerrit-review.googlesource.com/Documentation/
-
-Before we can land your change, you need to sign the Google CLA:
-
- * https://cla.developers.google.com/
diff --git a/COPYRIGHT b/COPYRIGHT
new file mode 100644
index 0000000..8f274b3
--- /dev/null
+++ b/COPYRIGHT
@@ -0,0 +1,126 @@
+# $FreeBSD: head/COPYRIGHT 260125 2013-12-31 12:18:10Z gjb $
+#	@(#)COPYRIGHT	8.2 (Berkeley) 3/21/94
+
+The compilation of software known as FreeBSD is distributed under the
+following terms:
+
+Copyright (c) 1992-2014 The FreeBSD Project. 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.
+
+The 4.4BSD and 4.4BSD-Lite software is distributed under the following
+terms:
+
+All of the documentation and software included in the 4.4BSD and 4.4BSD-Lite
+Releases is copyrighted by The Regents of the University of California.
+
+Copyright 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
+	The Regents of the University of California.  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.
+3. All advertising materials mentioning features or use of this software
+   must display the following acknowledgement:
+This product includes software developed by the University of
+California, Berkeley and its contributors.
+4. Neither the name of the University nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+
+The Institute of Electrical and Electronics Engineers and the American
+National Standards Committee X3, on Information Processing Systems have
+given us permission to reprint portions of their documentation.
+
+In the following statement, the phrase ``this text'' refers to portions
+of the system documentation.
+
+Portions of this text are reprinted and reproduced in electronic form in
+the second BSD Networking Software Release, from IEEE Std 1003.1-1988, IEEE
+Standard Portable Operating System Interface for Computer Environments
+(POSIX), copyright C 1988 by the Institute of Electrical and Electronics
+Engineers, Inc.  In the event of any discrepancy between these versions
+and the original IEEE Standard, the original IEEE Standard is the referee
+document.
+
+In the following statement, the phrase ``This material'' refers to portions
+of the system documentation.
+
+This material is reproduced with permission from American National
+Standards Committee X3, on Information Processing Systems.  Computer and
+Business Equipment Manufacturers Association (CBEMA), 311 First St., NW,
+Suite 500, Washington, DC 20001-2178.  The developmental work of
+Programming Language C was completed by the X3J11 Technical Committee.
+
+The views and conclusions contained in the software and documentation are
+those of the authors and should not be interpreted as representing official
+policies, either expressed or implied, of the Regents of the University
+of California.
+
+
+NOTE: The copyright of UC Berkeley's Berkeley Software Distribution ("BSD")
+source has been updated.  The copyright addendum may be found at
+ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change and is
+included below.
+
+July 22, 1999
+
+To All Licensees, Distributors of Any Version of BSD:
+
+As you know, certain of the Berkeley Software Distribution ("BSD") source
+code files require that further distributions of products containing all or
+portions of the software, acknowledge within their advertising materials
+that such products contain software developed by UC Berkeley and its
+contributors.
+
+Specifically, the provision reads:
+
+"     * 3. All advertising materials mentioning features or use of this software
+      *    must display the following acknowledgement:
+      *    This product includes software developed by the University of
+      *    California, Berkeley and its contributors."
+
+Effective immediately, licensees and distributors are no longer required to
+include the acknowledgement within advertising materials.  Accordingly, the
+foregoing paragraph of those BSD Unix files containing it is hereby deleted
+in its entirety.
+
+William Hoskins
+Director, Office of Technology Licensing
+University of California, Berkeley
diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index ac6402f..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,27 +0,0 @@
-// Copyright 2016 The Fuchsia Authors. All rights reserved.
-//
-// Redistribution and use in source and binary forms, with or without
-// modification, are permitted provided that the following conditions are
-// met:
-//
-//    * Redistributions of source code must retain the above copyright
-// notice, this list of conditions and the following disclaimer.
-//    * 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.
-//    * Neither the name of Google Inc. nor the names of its
-// contributors may be used to endorse or promote products derived from
-// this software without specific prior written permission.
-//
-// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT
-// OWNER 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.
diff --git a/README.md b/README.md
index 8b90b74..93cbbc1 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,24 @@
-Fuchsia Open Source Template Repository
-=======================================
+Name: libteken
+URL: svn://svn.FreeBSD.org/base/head/sys/teken/
+Version: r276292
+License: BSD
+License File: COPYRIGHT
+Security Critical: no
 
-This repository is a template that we will use when creating new open source
-repositories for Fuchsia.
+Description:
+This is libteken from FreeBSD, a VT100-ish terminal emulator library.
+
+It was obtained as follows (from this directory):
+
+  svn export svn://svn.FreeBSD.org/base/head/sys/teken/@276292
+  svn export svn://svn.FreeBSD.org/base/head/COPYRIGHT@276292
+
+Local modifications:
+* teken/teken_state.h: manually generated (from the teken subdirectory) using:
+  |awk -f gensequences sequences > teken_state.h|.
+* teken/teken.h: |#include <stdint.h>|.
+* teken/teken.h: |extern "C"| guards added for C++.
+* teken/gensequences: made executable, to placate checkperms.py.
+* teken/{demo, libteken, stress}: removed.
+* teken.c: remove sys/cdefs.h to fix fnl/musl build
+  (http://wiki.musl-libc.org/wiki/FAQ#Q:_I.27m_trying_to_compile_something_against_musl_and_I_get_error_messages_about_sys.2Fcdefs.h)
diff --git a/teken/gensequences b/teken/gensequences
new file mode 100755
index 0000000..83a3d10
--- /dev/null
+++ b/teken/gensequences
@@ -0,0 +1,157 @@
+#!/usr/bin/awk -f
+
+#-
+# Copyright (c) 2008-2009 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: head/sys/teken/gensequences 223574 2011-06-26 18:25:10Z ed $
+
+function die(msg) {
+	print msg;
+	exit 1;
+}
+
+function cchar(str) {
+	if (str == "^[")
+		return "\\x1B";
+
+	return str;
+}
+
+BEGIN {
+FS = "\t+"
+
+while (getline > 0) {
+	if (NF == 0 || $1 ~ /^#/)
+		continue;
+
+	if (NF != 3 && NF != 4)
+		die("Invalid line layout: " NF " columns");
+
+	split($3, sequence, " +");
+	nsequences = 0;
+	for (s in sequence)
+		nsequences++;
+
+	prefix = "";
+	l_prefix_name[""] = "teken_state_init";
+	for (i = 1; i < nsequences; i++) {
+		n = prefix sequence[i];
+		l_prefix_parent[n] = prefix;
+		l_prefix_suffix[n] = sequence[i];
+		if (!l_prefix_name[n])
+			l_prefix_name[n] = "teken_state_" ++npr;
+		prefix = n;
+	}
+
+	suffix = sequence[nsequences];
+	cmd = prefix suffix;
+
+	# Fill lists
+	if (l_cmd_name[cmd] != "")
+		die(cmd " already exists");
+	l_cmd_prefix[cmd] = prefix;
+	l_cmd_suffix[cmd] = suffix;
+	l_cmd_args[cmd] = $4;
+	l_cmd_abbr[cmd] = $1;
+	l_cmd_name[cmd] = $2;
+	l_cmd_c_name[cmd] = "teken_subr_" tolower($2);
+	gsub(" ", "_", l_cmd_c_name[cmd]);
+
+	if ($4 != "")
+		l_prefix_numbercmds[prefix]++;
+}
+
+print "/* Generated file. Do not edit. */";
+print "";
+
+for (p in l_prefix_name) {
+	if (l_prefix_name[p] != "teken_state_init")
+		print "static teken_state_t	" l_prefix_name[p] ";";
+}
+
+for (p in l_prefix_name) {
+	print "";
+	print "/* '" p "' */";
+	print "static void";
+	print l_prefix_name[p] "(teken_t *t, teken_char_t c)";
+	print "{";
+
+	if (l_prefix_numbercmds[p] > 0) {
+		print "";
+		print "\tif (teken_state_numbers(t, c))";
+		print "\t\treturn;";
+	}
+
+	print "";
+	print "\tswitch (c) {";
+	for (c in l_cmd_prefix) {
+		if (l_cmd_prefix[c] != p)
+			continue;
+
+		print "\tcase '" cchar(l_cmd_suffix[c]) "': /* " l_cmd_abbr[c] ": " l_cmd_name[c] " */";
+
+		if (l_cmd_args[c] == "v") {
+			print "\t\t" l_cmd_c_name[c] "(t, t->t_curnum, t->t_nums);";
+		} else {
+			printf "\t\t%s(t", l_cmd_c_name[c];
+			split(l_cmd_args[c], args, " ");
+			for (a = 1; args[a] != ""; a++) {
+				if (args[a] == "n")
+					printf ", (t->t_curnum < %d || t->t_nums[%d] == 0) ? 1 : t->t_nums[%d]", a, (a - 1), (a - 1);
+				else if (args[a] == "r")
+					printf ", t->t_curnum < %d ? 0 : t->t_nums[%d]", a, (a - 1);
+				else
+					die("Invalid argument type: " args[a]);
+			}
+			print ");";
+		}
+		print "\t\tbreak;";
+	}
+	for (pc in l_prefix_parent) {
+		if (l_prefix_parent[pc] != p)
+			continue;
+		print "\tcase '" cchar(l_prefix_suffix[pc]) "':";
+		print "\t\tteken_state_switch(t, " l_prefix_name[pc] ");";
+		print "\t\treturn;";
+	}
+
+	print "\tdefault:";
+	if (l_prefix_name[p] == "teken_state_init") {
+		print "\t\tteken_subr_regular_character(t, c);";
+	} else {
+		print "\t\tteken_printf(\"Unsupported sequence in " l_prefix_name[p] ": %u\\n\", (unsigned int)c);";
+	}
+	print "\t\tbreak;";
+
+	print "\t}";
+
+	if (l_prefix_name[p] != "teken_state_init") {
+		print "";
+		print "\tteken_state_switch(t, teken_state_init);";
+	}
+	print "}";
+}
+
+}
diff --git a/teken/sequences b/teken/sequences
new file mode 100644
index 0000000..080657a
--- /dev/null
+++ b/teken/sequences
@@ -0,0 +1,113 @@
+#-
+# Copyright (c) 2008-2009 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: head/sys/teken/sequences 214817 2010-11-05 00:56:21Z ed $
+
+# File format is as follows:
+#	Abbr		Abbreviation of sequence name
+#	Name		Sequence name (will be converted to C function name)
+#	Sequence	Bytes that form the sequence
+#	Arguments	Standard value of arguments passed to this sequence
+#			- `n' non-zero number (0 gets converted to 1)
+#			- `r' regular numeric argument
+#			- `v' means a variable number of arguments
+
+# Abbr	Name					Sequence	Arguments
+CBT	Cursor Backward Tabulation		^[ [ Z		n
+CHT	Cursor Forward Tabulation		^[ [ I		n
+CNL	Cursor Next Line			^[ [ E		n
+CPL	Cursor Previous Line			^[ [ F		n
+CPR	Cursor Position Report			^[ [ n		r
+CUB	Cursor Backward				^[ [ D		n
+CUD	Cursor Down				^[ [ B		n
+CUD	Cursor Down				^[ [ e		n
+CUF	Cursor Forward				^[ [ C		n
+CUF	Cursor Forward				^[ [ a		n
+CUP	Cursor Position				^[ [ H		n n
+CUP	Cursor Position				^[ [ f		n n
+CUU	Cursor Up				^[ [ A		n
+DA1	Primary Device Attributes		^[ [ c		r
+DA2	Secondary Device Attributes		^[ [ > c	r
+DC	Delete character			^[ [ P		n
+DCS	Device Control String			^[ P
+DECALN	Alignment test				^[ # 8
+DECDHL	Double Height Double Width Line Top	^[ # 3
+DECDHL	Double Height Double Width Line Bottom	^[ # 4
+DECDWL	Single Height Double Width Line		^[ # 6
+DECKPAM	Keypad application mode			^[ =
+DECKPNM	Keypad numeric mode			^[ >
+DECRC	Restore cursor				^[ 8
+DECRC	Restore cursor				^[ [ u
+DECRM	Reset DEC mode				^[ [ ? l	r
+DECSC	Save cursor				^[ 7
+DECSC	Save cursor				^[ [ s
+DECSM	Set DEC mode				^[ [ ? h	r
+DECSTBM	Set top and bottom margins		^[ [ r		r r
+DECSWL	Single Height Single Width Line		^[ # 5
+DL	Delete line				^[ [ M		n
+DSR	Device Status Report			^[ [ ? n	r
+ECH	Erase character				^[ [ X		n
+ED	Erase display				^[ [ J		r
+EL	Erase line				^[ [ K		r
+G0SCS0	G0 SCS Special Graphics			^[ ( 0
+G0SCS1	G0 SCS US ASCII				^[ ( 1
+G0SCS2	G0 SCS Special Graphics			^[ ( 2
+G0SCSA	G0 SCS UK National			^[ ( A
+G0SCSB	G0 SCS US ASCII				^[ ( B
+G1SCS0	G1 SCS Special Graphics			^[ ) 0
+G1SCS1	G1 SCS US ASCII				^[ ) 1
+G1SCS2	G1 SCS Special Graphics			^[ ) 2
+G1SCSA	G1 SCS UK National			^[ ) A
+G1SCSB	G1 SCS US ASCII				^[ ) B
+HPA	Horizontal Position Absolute		^[ [ G		n
+HPA	Horizontal Position Absolute		^[ [ `		n
+HTS	Horizontal Tab Set			^[ H
+ICH	Insert character			^[ [ @		n
+IL	Insert line				^[ [ L		n
+IND	Index					^[ D
+NEL	Next line				^[ E
+OSC	Operating System Command		^[ ]
+RI	Reverse index				^[ M
+RIS	Reset to Initial State			^[ c
+RM	Reset Mode				^[ [ l		r
+SD	Pan Up					^[ [ T		n
+SGR	Set Graphic Rendition			^[ [ m		v
+SM	Set Mode				^[ [ h		r
+ST	String Terminator			^[ \\
+SU	Pan Down				^[ [ S		n
+TBC	Tab Clear				^[ [ g		r
+VPA	Vertical Position Absolute		^[ [ d		n
+
+# Cons25 compatibility sequences
+C25ADBG	Cons25 set adapter background		^[ [ = G	r
+C25ADFG	Cons25 set adapter foreground		^[ [ = F	r
+C25BLPD	Cons25 set bell pitch duration		^[ [ = B	r r
+C25CURS	Cons25 set cursor type			^[ [ = S	r
+C25MODE	Cons25 set terminal mode		^[ [ = T	r
+C25SGR	Cons25 set graphic rendition		^[ [ x		r r
+C25VTSW	Cons25 switch virtual terminal		^[ [ z		r
+
+# VT52 compatibility
+#DECID	VT52 DECID				^[ Z
diff --git a/teken/teken.c b/teken/teken.c
new file mode 100644
index 0000000..b1c9d15
--- /dev/null
+++ b/teken/teken.c
@@ -0,0 +1,557 @@
+/*-
+ * Copyright (c) 2008-2009 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: head/sys/teken/teken.c 261551 2014-02-06 13:28:06Z ray $
+ */
+
+#if defined(__FreeBSD__) && defined(_KERNEL)
+#include <sys/param.h>
+#include <sys/lock.h>
+#include <sys/systm.h>
+#define	teken_assert(x)		MPASS(x)
+#else /* !(__FreeBSD__ && _KERNEL) */
+#include <sys/types.h>
+#include <assert.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#define	teken_assert(x)		assert(x)
+#endif /* __FreeBSD__ && _KERNEL */
+
+/* debug messages */
+#define	teken_printf(x,...)
+
+/* Private flags for t_stateflags. */
+#define	TS_FIRSTDIGIT	0x0001	/* First numeric digit in escape sequence. */
+#define	TS_INSERT	0x0002	/* Insert mode. */
+#define	TS_AUTOWRAP	0x0004	/* Autowrap. */
+#define	TS_ORIGIN	0x0008	/* Origin mode. */
+#define	TS_WRAPPED	0x0010	/* Next character should be printed on col 0. */
+#define	TS_8BIT		0x0020	/* UTF-8 disabled. */
+#define	TS_CONS25	0x0040	/* cons25 emulation. */
+#define	TS_INSTRING	0x0080	/* Inside string. */
+#define	TS_CURSORKEYS	0x0100	/* Cursor keys mode. */
+
+/* Character that blanks a cell. */
+#define	BLANK	' '
+
+#include "teken.h"
+#include "teken_wcwidth.h"
+#include "teken_scs.h"
+
+static teken_state_t	teken_state_init;
+
+/*
+ * Wrappers for hooks.
+ */
+
+static inline void
+teken_funcs_bell(teken_t *t)
+{
+
+	t->t_funcs->tf_bell(t->t_softc);
+}
+
+static inline void
+teken_funcs_cursor(teken_t *t)
+{
+
+	teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
+	teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
+
+	t->t_funcs->tf_cursor(t->t_softc, &t->t_cursor);
+}
+
+static inline void
+teken_funcs_putchar(teken_t *t, const teken_pos_t *p, teken_char_t c,
+    const teken_attr_t *a)
+{
+
+	teken_assert(p->tp_row < t->t_winsize.tp_row);
+	teken_assert(p->tp_col < t->t_winsize.tp_col);
+
+	t->t_funcs->tf_putchar(t->t_softc, p, c, a);
+}
+
+static inline void
+teken_funcs_fill(teken_t *t, const teken_rect_t *r,
+    const teken_char_t c, const teken_attr_t *a)
+{
+
+	teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
+	teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
+	teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
+	teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
+
+	t->t_funcs->tf_fill(t->t_softc, r, c, a);
+}
+
+static inline void
+teken_funcs_copy(teken_t *t, const teken_rect_t *r, const teken_pos_t *p)
+{
+
+	teken_assert(r->tr_end.tp_row > r->tr_begin.tp_row);
+	teken_assert(r->tr_end.tp_row <= t->t_winsize.tp_row);
+	teken_assert(r->tr_end.tp_col > r->tr_begin.tp_col);
+	teken_assert(r->tr_end.tp_col <= t->t_winsize.tp_col);
+	teken_assert(p->tp_row + (r->tr_end.tp_row - r->tr_begin.tp_row) <= t->t_winsize.tp_row);
+	teken_assert(p->tp_col + (r->tr_end.tp_col - r->tr_begin.tp_col) <= t->t_winsize.tp_col);
+
+	t->t_funcs->tf_copy(t->t_softc, r, p);
+}
+
+static inline void
+teken_funcs_param(teken_t *t, int cmd, unsigned int value)
+{
+
+	t->t_funcs->tf_param(t->t_softc, cmd, value);
+}
+
+static inline void
+teken_funcs_respond(teken_t *t, const void *buf, size_t len)
+{
+
+	t->t_funcs->tf_respond(t->t_softc, buf, len);
+}
+
+#include "teken_subr.h"
+#include "teken_subr_compat.h"
+
+/*
+ * Programming interface.
+ */
+
+void
+teken_init(teken_t *t, const teken_funcs_t *tf, void *softc)
+{
+	teken_pos_t tp = { .tp_row = 24, .tp_col = 80 };
+
+	t->t_funcs = tf;
+	t->t_softc = softc;
+
+	t->t_nextstate = teken_state_init;
+	t->t_stateflags = 0;
+	t->t_utf8_left = 0;
+
+	t->t_defattr.ta_format = 0;
+	t->t_defattr.ta_fgcolor = TC_WHITE;
+	t->t_defattr.ta_bgcolor = TC_BLACK;
+	teken_subr_do_reset(t);
+
+	teken_set_winsize(t, &tp);
+}
+
+static void
+teken_input_char(teken_t *t, teken_char_t c)
+{
+
+	/*
+	 * There is no support for DCS and OSC.  Just discard strings
+	 * until we receive characters that may indicate string
+	 * termination.
+	 */
+	if (t->t_stateflags & TS_INSTRING) {
+		switch (c) {
+		case '\x1B':
+			t->t_stateflags &= ~TS_INSTRING;
+			break;
+		case '\a':
+			t->t_stateflags &= ~TS_INSTRING;
+			return;
+		default:
+			return;
+		}
+	}
+
+	switch (c) {
+	case '\0':
+		break;
+	case '\a':
+		teken_subr_bell(t);
+		break;
+	case '\b':
+		teken_subr_backspace(t);
+		break;
+	case '\n':
+	case '\x0B':
+		teken_subr_newline(t);
+		break;
+	case '\x0C':
+		teken_subr_newpage(t);
+		break;
+	case '\x0E':
+		if (t->t_stateflags & TS_CONS25)
+			t->t_nextstate(t, c);
+		else
+			t->t_curscs = 1;
+		break;
+	case '\x0F':
+		if (t->t_stateflags & TS_CONS25)
+			t->t_nextstate(t, c);
+		else
+			t->t_curscs = 0;
+		break;
+	case '\r':
+		teken_subr_carriage_return(t);
+		break;
+	case '\t':
+		teken_subr_horizontal_tab(t);
+		break;
+	default:
+		t->t_nextstate(t, c);
+		break;
+	}
+
+	/* Post-processing assertions. */
+	teken_assert(t->t_cursor.tp_row >= t->t_originreg.ts_begin);
+	teken_assert(t->t_cursor.tp_row < t->t_originreg.ts_end);
+	teken_assert(t->t_cursor.tp_row < t->t_winsize.tp_row);
+	teken_assert(t->t_cursor.tp_col < t->t_winsize.tp_col);
+	teken_assert(t->t_saved_cursor.tp_row < t->t_winsize.tp_row);
+	teken_assert(t->t_saved_cursor.tp_col < t->t_winsize.tp_col);
+	teken_assert(t->t_scrollreg.ts_end <= t->t_winsize.tp_row);
+	teken_assert(t->t_scrollreg.ts_begin < t->t_scrollreg.ts_end);
+	/* Origin region has to be window size or the same as scrollreg. */
+	teken_assert((t->t_originreg.ts_begin == t->t_scrollreg.ts_begin &&
+	    t->t_originreg.ts_end == t->t_scrollreg.ts_end) ||
+	    (t->t_originreg.ts_begin == 0 &&
+	    t->t_originreg.ts_end == t->t_winsize.tp_row));
+}
+
+static void
+teken_input_byte(teken_t *t, unsigned char c)
+{
+
+	/*
+	 * UTF-8 handling.
+	 */
+	if ((c & 0x80) == 0x00 || t->t_stateflags & TS_8BIT) {
+		/* One-byte sequence. */
+		t->t_utf8_left = 0;
+		teken_input_char(t, c);
+	} else if ((c & 0xe0) == 0xc0) {
+		/* Two-byte sequence. */
+		t->t_utf8_left = 1;
+		t->t_utf8_partial = c & 0x1f;
+	} else if ((c & 0xf0) == 0xe0) {
+		/* Three-byte sequence. */
+		t->t_utf8_left = 2;
+		t->t_utf8_partial = c & 0x0f;
+	} else if ((c & 0xf8) == 0xf0) {
+		/* Four-byte sequence. */
+		t->t_utf8_left = 3;
+		t->t_utf8_partial = c & 0x07;
+	} else if ((c & 0xc0) == 0x80) {
+		if (t->t_utf8_left == 0)
+			return;
+		t->t_utf8_left--;
+		t->t_utf8_partial = (t->t_utf8_partial << 6) | (c & 0x3f);
+		if (t->t_utf8_left == 0) {
+			teken_printf("Got UTF-8 char %x\n", t->t_utf8_partial);
+			teken_input_char(t, t->t_utf8_partial);
+		}
+	}
+}
+
+void
+teken_input(teken_t *t, const void *buf, size_t len)
+{
+	const char *c = buf;
+
+	while (len-- > 0)
+		teken_input_byte(t, *c++);
+}
+
+const teken_pos_t *
+teken_get_cursor(teken_t *t)
+{
+
+	return (&t->t_cursor);
+}
+
+void
+teken_set_cursor(teken_t *t, const teken_pos_t *p)
+{
+
+	/* XXX: bounds checking with originreg! */
+	teken_assert(p->tp_row < t->t_winsize.tp_row);
+	teken_assert(p->tp_col < t->t_winsize.tp_col);
+
+	t->t_cursor = *p;
+}
+
+const teken_attr_t *
+teken_get_curattr(teken_t *t)
+{
+
+	return (&t->t_curattr);
+}
+
+void
+teken_set_curattr(teken_t *t, const teken_attr_t *a)
+{
+
+	t->t_curattr = *a;
+}
+
+const teken_attr_t *
+teken_get_defattr(teken_t *t)
+{
+
+	return (&t->t_defattr);
+}
+
+void
+teken_set_defattr(teken_t *t, const teken_attr_t *a)
+{
+
+	t->t_curattr = t->t_saved_curattr = t->t_defattr = *a;
+}
+
+const teken_pos_t *
+teken_get_winsize(teken_t *t)
+{
+
+	return (&t->t_winsize);
+}
+
+static void
+teken_trim_cursor_pos(teken_t *t, const teken_pos_t *new)
+{
+	const teken_pos_t *cur;
+
+	cur = &t->t_winsize;
+
+	if (cur->tp_row < new->tp_row || cur->tp_col < new->tp_col)
+		return;
+	if (t->t_cursor.tp_row >= new->tp_row)
+		t->t_cursor.tp_row = new->tp_row - 1;
+	if (t->t_cursor.tp_col >= new->tp_col)
+		t->t_cursor.tp_col = new->tp_col - 1;
+}
+
+void
+teken_set_winsize(teken_t *t, const teken_pos_t *p)
+{
+
+	teken_trim_cursor_pos(t, p);
+	t->t_winsize = *p;
+	teken_subr_do_reset(t);
+}
+
+void
+teken_set_winsize_noreset(teken_t *t, const teken_pos_t *p)
+{
+
+	teken_trim_cursor_pos(t, p);
+	t->t_winsize = *p;
+	teken_subr_do_resize(t);
+}
+
+void
+teken_set_8bit(teken_t *t)
+{
+
+	t->t_stateflags |= TS_8BIT;
+}
+
+void
+teken_set_cons25(teken_t *t)
+{
+
+	t->t_stateflags |= TS_CONS25;
+}
+
+/*
+ * State machine.
+ */
+
+static void
+teken_state_switch(teken_t *t, teken_state_t *s)
+{
+
+	t->t_nextstate = s;
+	t->t_curnum = 0;
+	t->t_stateflags |= TS_FIRSTDIGIT;
+}
+
+static int
+teken_state_numbers(teken_t *t, teken_char_t c)
+{
+
+	teken_assert(t->t_curnum < T_NUMSIZE);
+
+	if (c >= '0' && c <= '9') {
+		/*
+		 * Don't do math with the default value of 1 when a
+		 * custom number is inserted.
+		 */
+		if (t->t_stateflags & TS_FIRSTDIGIT) {
+			t->t_stateflags &= ~TS_FIRSTDIGIT;
+			t->t_nums[t->t_curnum] = 0;
+		} else {
+			t->t_nums[t->t_curnum] *= 10;
+		}
+
+		t->t_nums[t->t_curnum] += c - '0';
+		return (1);
+	} else if (c == ';') {
+		if (t->t_stateflags & TS_FIRSTDIGIT)
+			t->t_nums[t->t_curnum] = 0;
+
+		/* Only allow a limited set of arguments. */
+		if (++t->t_curnum == T_NUMSIZE) {
+			teken_state_switch(t, teken_state_init);
+			return (1);
+		}
+
+		t->t_stateflags |= TS_FIRSTDIGIT;
+		return (1);
+	} else {
+		if (t->t_stateflags & TS_FIRSTDIGIT && t->t_curnum > 0) {
+			/* Finish off the last empty argument. */
+			t->t_nums[t->t_curnum] = 0;
+			t->t_curnum++;
+		} else if ((t->t_stateflags & TS_FIRSTDIGIT) == 0) {
+			/* Also count the last argument. */
+			t->t_curnum++;
+		}
+	}
+
+	return (0);
+}
+
+teken_color_t
+teken_256to8(teken_color_t c)
+{
+	unsigned int r, g, b;
+
+	if (c < 16) {
+		/* Traditional color indices. */
+		return (c % 8);
+	} else if (c >= 244) {
+		/* Upper grayscale colors. */
+		return (TC_WHITE);
+	} else if (c >= 232) {
+		/* Lower grayscale colors. */
+		return (TC_BLACK);
+	}
+
+	/* Convert to RGB. */
+	c -= 16;
+	b = c % 6;
+	g = (c / 6) % 6;
+	r = c / 36;
+
+	if (r < g) {
+		/* Possibly green. */
+		if (g < b)
+			return (TC_BLUE);
+		else if (g > b)
+			return (TC_GREEN);
+		else
+			return (TC_CYAN);
+	} else if (r > g) {
+		/* Possibly red. */
+		if (r < b)
+			return (TC_BLUE);
+		else if (r > b)
+			return (TC_RED);
+		else
+			return (TC_MAGENTA);
+	} else {
+		/* Possibly brown. */
+		if (g < b)
+			return (TC_BLUE);
+		else if (g > b)
+			return (TC_BROWN);
+		else if (r < 3)
+			return (TC_BLACK);
+		else
+			return (TC_WHITE);
+	}
+}
+
+static const char * const special_strings_cons25[] = {
+	[TKEY_UP] = "\x1B[A",		[TKEY_DOWN] = "\x1B[B",
+	[TKEY_LEFT] = "\x1B[D",		[TKEY_RIGHT] = "\x1B[C",
+
+	[TKEY_HOME] = "\x1B[H",		[TKEY_END] = "\x1B[F",
+	[TKEY_INSERT] = "\x1B[L",	[TKEY_DELETE] = "\x7F",
+	[TKEY_PAGE_UP] = "\x1B[I",	[TKEY_PAGE_DOWN] = "\x1B[G",
+
+	[TKEY_F1] = "\x1B[M",		[TKEY_F2] = "\x1B[N",
+	[TKEY_F3] = "\x1B[O",		[TKEY_F4] = "\x1B[P",
+	[TKEY_F5] = "\x1B[Q",		[TKEY_F6] = "\x1B[R",
+	[TKEY_F7] = "\x1B[S",		[TKEY_F8] = "\x1B[T",
+	[TKEY_F9] = "\x1B[U",		[TKEY_F10] = "\x1B[V",
+	[TKEY_F11] = "\x1B[W",		[TKEY_F12] = "\x1B[X",
+};
+
+static const char * const special_strings_ckeys[] = {
+	[TKEY_UP] = "\x1BOA",		[TKEY_DOWN] = "\x1BOB",
+	[TKEY_LEFT] = "\x1BOD",		[TKEY_RIGHT] = "\x1BOC",
+
+	[TKEY_HOME] = "\x1BOH",		[TKEY_END] = "\x1BOF",
+};
+
+static const char * const special_strings_normal[] = {
+	[TKEY_UP] = "\x1B[A",		[TKEY_DOWN] = "\x1B[B",
+	[TKEY_LEFT] = "\x1B[D",		[TKEY_RIGHT] = "\x1B[C",
+
+	[TKEY_HOME] = "\x1B[H",		[TKEY_END] = "\x1B[F",
+	[TKEY_INSERT] = "\x1B[2~",	[TKEY_DELETE] = "\x1B[3~",
+	[TKEY_PAGE_UP] = "\x1B[5~",	[TKEY_PAGE_DOWN] = "\x1B[6~",
+
+	[TKEY_F1] = "\x1BOP",		[TKEY_F2] = "\x1BOQ",
+	[TKEY_F3] = "\x1BOR",		[TKEY_F4] = "\x1BOS",
+	[TKEY_F5] = "\x1B[15~",		[TKEY_F6] = "\x1B[17~",
+	[TKEY_F7] = "\x1B[18~",		[TKEY_F8] = "\x1B[19~",
+	[TKEY_F9] = "\x1B[20~",		[TKEY_F10] = "\x1B[21~",
+	[TKEY_F11] = "\x1B[23~",	[TKEY_F12] = "\x1B[24~",
+};
+
+const char *
+teken_get_sequence(teken_t *t, unsigned int k)
+{
+
+	/* Cons25 mode. */
+	if (t->t_stateflags & TS_CONS25 &&
+	    k < sizeof special_strings_cons25 / sizeof(char *))
+		return (special_strings_cons25[k]);
+
+	/* Cursor keys mode. */
+	if (t->t_stateflags & TS_CURSORKEYS &&
+	    k < sizeof special_strings_ckeys / sizeof(char *))
+		return (special_strings_ckeys[k]);
+
+	/* Default xterm sequences. */
+	if (k < sizeof special_strings_normal / sizeof(char *))
+		return (special_strings_normal[k]);
+
+	return (NULL);
+}
+
+#include "teken_state.h"
diff --git a/teken/teken.h b/teken/teken.h
new file mode 100644
index 0000000..e5c252b
--- /dev/null
+++ b/teken/teken.h
@@ -0,0 +1,223 @@
+/*-
+ * Copyright (c) 2008-2009 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: head/sys/teken/teken.h 259667 2013-12-20 21:31:50Z ed $
+ */
+
+#ifndef _TEKEN_H_
+#define	_TEKEN_H_
+
+// !!! Start of Mojo addition.
+#include <stdint.h>
+// !!! End of Mojo addition.
+#include <sys/types.h>
+
+/*
+ * libteken: terminal emulation library.
+ *
+ * This library converts an UTF-8 stream of bytes to terminal drawing
+ * commands.
+ */
+
+// !!! Start of Mojo addition.
+#ifdef __cplusplus
+extern "C" {
+#endif
+// !!! End of Mojo addition.
+
+typedef uint32_t teken_char_t;
+typedef unsigned short teken_unit_t;
+typedef unsigned char teken_format_t;
+#define	TF_BOLD		0x01	/* Bold character. */
+#define	TF_UNDERLINE	0x02	/* Underline character. */
+#define	TF_BLINK	0x04	/* Blinking character. */
+#define	TF_REVERSE	0x08	/* Reverse rendered character. */
+#define	TF_CJK_RIGHT	0x10	/* Right-hand side of CJK character. */
+typedef unsigned char teken_color_t;
+#define	TC_BLACK	0
+#define	TC_RED		1
+#define	TC_GREEN	2
+#define	TC_BROWN	3
+#define	TC_BLUE		4
+#define	TC_MAGENTA	5
+#define	TC_CYAN		6
+#define	TC_WHITE	7
+#define	TC_NCOLORS	8
+
+typedef struct {
+	teken_unit_t	tp_row;
+	teken_unit_t	tp_col;
+} teken_pos_t;
+typedef struct {
+	teken_pos_t	tr_begin;
+	teken_pos_t	tr_end;
+} teken_rect_t;
+typedef struct {
+	teken_format_t	ta_format;
+	teken_color_t	ta_fgcolor;
+	teken_color_t	ta_bgcolor;
+} teken_attr_t;
+typedef struct {
+	teken_unit_t	ts_begin;
+	teken_unit_t	ts_end;
+} teken_span_t;
+
+typedef struct __teken teken_t;
+
+typedef void teken_state_t(teken_t *, teken_char_t);
+
+/*
+ * Drawing routines supplied by the user.
+ */
+
+typedef void tf_bell_t(void *);
+typedef void tf_cursor_t(void *, const teken_pos_t *);
+typedef void tf_putchar_t(void *, const teken_pos_t *, teken_char_t,
+    const teken_attr_t *);
+typedef void tf_fill_t(void *, const teken_rect_t *, teken_char_t,
+    const teken_attr_t *);
+typedef void tf_copy_t(void *, const teken_rect_t *, const teken_pos_t *);
+typedef void tf_param_t(void *, int, unsigned int);
+#define	TP_SHOWCURSOR	0
+#define	TP_KEYPADAPP	1
+#define	TP_AUTOREPEAT	2
+#define	TP_SWITCHVT	3
+#define	TP_132COLS	4
+#define	TP_SETBELLPD	5
+#define	TP_SETBELLPD_PITCH(pd)		((pd) >> 16)
+#define	TP_SETBELLPD_DURATION(pd)	((pd) & 0xffff)
+#define	TP_MOUSE	6
+typedef void tf_respond_t(void *, const void *, size_t);
+
+typedef struct {
+	tf_bell_t	*tf_bell;
+	tf_cursor_t	*tf_cursor;
+	tf_putchar_t	*tf_putchar;
+	tf_fill_t	*tf_fill;
+	tf_copy_t	*tf_copy;
+	tf_param_t	*tf_param;
+	tf_respond_t	*tf_respond;
+} teken_funcs_t;
+
+typedef teken_char_t teken_scs_t(teken_t *, teken_char_t);
+
+/*
+ * Terminal state.
+ */
+
+struct __teken {
+	const teken_funcs_t *t_funcs;
+	void		*t_softc;
+
+	teken_state_t	*t_nextstate;
+	unsigned int	 t_stateflags;
+
+#define T_NUMSIZE	8
+	unsigned int	 t_nums[T_NUMSIZE];
+	unsigned int	 t_curnum;
+
+	teken_pos_t	 t_cursor;
+	teken_attr_t	 t_curattr;
+	teken_pos_t	 t_saved_cursor;
+	teken_attr_t	 t_saved_curattr;
+
+	teken_attr_t	 t_defattr;
+	teken_pos_t	 t_winsize;
+
+	/* For DECSTBM. */
+	teken_span_t	 t_scrollreg;
+	/* For DECOM. */
+	teken_span_t	 t_originreg;
+
+#define	T_NUMCOL	160
+	unsigned int	 t_tabstops[T_NUMCOL / (sizeof(unsigned int) * 8)];
+
+	unsigned int	 t_utf8_left;
+	teken_char_t	 t_utf8_partial;
+
+	unsigned int	 t_curscs;
+	teken_scs_t	*t_saved_curscs;
+	teken_scs_t	*t_scs[2];
+};
+
+/* Initialize teken structure. */
+void	teken_init(teken_t *, const teken_funcs_t *, void *);
+
+/* Deliver character input. */
+void	teken_input(teken_t *, const void *, size_t);
+
+/* Get/set teken attributes. */
+const teken_pos_t *teken_get_cursor(teken_t *);
+const teken_attr_t *teken_get_curattr(teken_t *);
+const teken_attr_t *teken_get_defattr(teken_t *);
+void	teken_get_defattr_cons25(teken_t *, int *, int *);
+const teken_pos_t *teken_get_winsize(teken_t *);
+void	teken_set_cursor(teken_t *, const teken_pos_t *);
+void	teken_set_curattr(teken_t *, const teken_attr_t *);
+void	teken_set_defattr(teken_t *, const teken_attr_t *);
+void	teken_set_winsize(teken_t *, const teken_pos_t *);
+void	teken_set_winsize_noreset(teken_t *, const teken_pos_t *);
+
+/* Key input escape sequences. */
+#define	TKEY_UP		0x00
+#define	TKEY_DOWN	0x01
+#define	TKEY_LEFT	0x02
+#define	TKEY_RIGHT	0x03
+
+#define	TKEY_HOME	0x04
+#define	TKEY_END	0x05
+#define	TKEY_INSERT	0x06
+#define	TKEY_DELETE	0x07
+#define	TKEY_PAGE_UP	0x08
+#define	TKEY_PAGE_DOWN	0x09
+
+#define	TKEY_F1		0x0a
+#define	TKEY_F2		0x0b
+#define	TKEY_F3		0x0c
+#define	TKEY_F4		0x0d
+#define	TKEY_F5		0x0e
+#define	TKEY_F6		0x0f
+#define	TKEY_F7		0x10
+#define	TKEY_F8		0x11
+#define	TKEY_F9		0x12
+#define	TKEY_F10	0x13
+#define	TKEY_F11	0x14
+#define	TKEY_F12	0x15
+const char *teken_get_sequence(teken_t *, unsigned int);
+
+/* Legacy features. */
+void	teken_set_8bit(teken_t *);
+void	teken_set_cons25(teken_t *);
+
+/* Color conversion. */
+teken_color_t teken_256to8(teken_color_t);
+
+// !!! Start of Mojo addition.
+#ifdef __cplusplus
+}  // extern "C"
+#endif
+// !!! End of Mojo addition.
+
+#endif /* !_TEKEN_H_ */
diff --git a/teken/teken_scs.h b/teken/teken_scs.h
new file mode 100644
index 0000000..c055894
--- /dev/null
+++ b/teken/teken_scs.h
@@ -0,0 +1,80 @@
+/*-
+ * Copyright (c) 2009 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: head/sys/teken/teken_scs.h 203659 2010-02-08 09:16:59Z ed $
+ */
+
+static inline teken_char_t
+teken_scs_process(teken_t *t, teken_char_t c)
+{
+
+	return (t->t_scs[t->t_curscs](t, c));
+}
+
+/* Unicode points for VT100 box drawing. */
+static const uint16_t teken_boxdrawing_unicode[31] = {
+    0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
+    0x2424, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
+    0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
+    0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7
+};
+
+/* ASCII points for VT100 box drawing. */
+static const uint8_t teken_boxdrawing_8bit[31] = {
+    '?', '?', 'H', 'F', 'C', 'L', '?', '?',
+    'N', 'V', '+', '+', '+', '+', '+', '-',
+    '-', '-', '-', '-', '+', '+', '+', '+',
+    '|', '?', '?', '?', '?', '?', '?',
+};
+
+static teken_char_t
+teken_scs_special_graphics(teken_t *t, teken_char_t c)
+{
+
+	/* Box drawing. */
+	if (c >= '`' && c <= '~')
+		return (t->t_stateflags & TS_8BIT ?
+		    teken_boxdrawing_8bit[c - '`'] :
+		    teken_boxdrawing_unicode[c - '`']);
+	return (c);
+}
+
+static teken_char_t
+teken_scs_uk_national(teken_t *t, teken_char_t c)
+{
+
+	/* Pound sign. */
+	if (c == '#')
+		return (t->t_stateflags & TS_8BIT ? 0x9c : 0xa3);
+	return (c);
+}
+
+static teken_char_t
+teken_scs_us_ascii(teken_t *t __unused, teken_char_t c)
+{
+
+	/* No processing. */
+	return (c);
+}
diff --git a/teken/teken_state.h b/teken/teken_state.h
new file mode 100644
index 0000000..65b0b44
--- /dev/null
+++ b/teken/teken_state.h
@@ -0,0 +1,383 @@
+/* Generated file. Do not edit. */
+
+static teken_state_t	teken_state_2;
+static teken_state_t	teken_state_6;
+static teken_state_t	teken_state_1;
+static teken_state_t	teken_state_7;
+static teken_state_t	teken_state_8;
+static teken_state_t	teken_state_3;
+static teken_state_t	teken_state_5;
+static teken_state_t	teken_state_4;
+
+/* '' */
+static void
+teken_state_init(teken_t *t, teken_char_t c)
+{
+
+	switch (c) {
+	case '\x1B':
+		teken_state_switch(t, teken_state_1);
+		return;
+	default:
+		teken_subr_regular_character(t, c);
+		break;
+	}
+}
+
+/* '^[[' */
+static void
+teken_state_2(teken_t *t, teken_char_t c)
+{
+
+	if (teken_state_numbers(t, c))
+		return;
+
+	switch (c) {
+	case 'X': /* ECH: Erase character */
+		teken_subr_erase_character(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'Z': /* CBT: Cursor Backward Tabulation */
+		teken_subr_cursor_backward_tabulation(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case '`': /* HPA: Horizontal Position Absolute */
+		teken_subr_horizontal_position_absolute(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'a': /* CUF: Cursor Forward */
+		teken_subr_cursor_forward(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'c': /* DA1: Primary Device Attributes */
+		teken_subr_primary_device_attributes(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'd': /* VPA: Vertical Position Absolute */
+		teken_subr_vertical_position_absolute(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'e': /* CUD: Cursor Down */
+		teken_subr_cursor_down(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'f': /* CUP: Cursor Position */
+		teken_subr_cursor_position(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0], (t->t_curnum < 2 || t->t_nums[1] == 0) ? 1 : t->t_nums[1]);
+		break;
+	case 'g': /* TBC: Tab Clear */
+		teken_subr_tab_clear(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'h': /* SM: Set Mode */
+		teken_subr_set_mode(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'l': /* RM: Reset Mode */
+		teken_subr_reset_mode(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'm': /* SGR: Set Graphic Rendition */
+		teken_subr_set_graphic_rendition(t, t->t_curnum, t->t_nums);
+		break;
+	case 'n': /* CPR: Cursor Position Report */
+		teken_subr_cursor_position_report(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'r': /* DECSTBM: Set top and bottom margins */
+		teken_subr_set_top_and_bottom_margins(t, t->t_curnum < 1 ? 0 : t->t_nums[0], t->t_curnum < 2 ? 0 : t->t_nums[1]);
+		break;
+	case 's': /* DECSC: Save cursor */
+		teken_subr_save_cursor(t);
+		break;
+	case 'u': /* DECRC: Restore cursor */
+		teken_subr_restore_cursor(t);
+		break;
+	case 'x': /* C25SGR: Cons25 set graphic rendition */
+		teken_subr_cons25_set_graphic_rendition(t, t->t_curnum < 1 ? 0 : t->t_nums[0], t->t_curnum < 2 ? 0 : t->t_nums[1]);
+		break;
+	case 'z': /* C25VTSW: Cons25 switch virtual terminal */
+		teken_subr_cons25_switch_virtual_terminal(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case '@': /* ICH: Insert character */
+		teken_subr_insert_character(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'A': /* CUU: Cursor Up */
+		teken_subr_cursor_up(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'B': /* CUD: Cursor Down */
+		teken_subr_cursor_down(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'C': /* CUF: Cursor Forward */
+		teken_subr_cursor_forward(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'D': /* CUB: Cursor Backward */
+		teken_subr_cursor_backward(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'E': /* CNL: Cursor Next Line */
+		teken_subr_cursor_next_line(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'F': /* CPL: Cursor Previous Line */
+		teken_subr_cursor_previous_line(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'G': /* HPA: Horizontal Position Absolute */
+		teken_subr_horizontal_position_absolute(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'H': /* CUP: Cursor Position */
+		teken_subr_cursor_position(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0], (t->t_curnum < 2 || t->t_nums[1] == 0) ? 1 : t->t_nums[1]);
+		break;
+	case 'I': /* CHT: Cursor Forward Tabulation */
+		teken_subr_cursor_forward_tabulation(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'J': /* ED: Erase display */
+		teken_subr_erase_display(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'K': /* EL: Erase line */
+		teken_subr_erase_line(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'L': /* IL: Insert line */
+		teken_subr_insert_line(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'M': /* DL: Delete line */
+		teken_subr_delete_line(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'P': /* DC: Delete character */
+		teken_subr_delete_character(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'S': /* SU: Pan Down */
+		teken_subr_pan_down(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case 'T': /* SD: Pan Up */
+		teken_subr_pan_up(t, (t->t_curnum < 1 || t->t_nums[0] == 0) ? 1 : t->t_nums[0]);
+		break;
+	case '=':
+		teken_state_switch(t, teken_state_8);
+		return;
+	case '>':
+		teken_state_switch(t, teken_state_3);
+		return;
+	case '?':
+		teken_state_switch(t, teken_state_5);
+		return;
+	default:
+		teken_printf("Unsupported sequence in teken_state_2: %u\n", (unsigned int)c);
+		break;
+	}
+
+	teken_state_switch(t, teken_state_init);
+}
+
+/* '^[(' */
+static void
+teken_state_6(teken_t *t, teken_char_t c)
+{
+
+	switch (c) {
+	case '0': /* G0SCS0: G0 SCS Special Graphics */
+		teken_subr_g0_scs_special_graphics(t);
+		break;
+	case '1': /* G0SCS1: G0 SCS US ASCII */
+		teken_subr_g0_scs_us_ascii(t);
+		break;
+	case '2': /* G0SCS2: G0 SCS Special Graphics */
+		teken_subr_g0_scs_special_graphics(t);
+		break;
+	case 'A': /* G0SCSA: G0 SCS UK National */
+		teken_subr_g0_scs_uk_national(t);
+		break;
+	case 'B': /* G0SCSB: G0 SCS US ASCII */
+		teken_subr_g0_scs_us_ascii(t);
+		break;
+	default:
+		teken_printf("Unsupported sequence in teken_state_6: %u\n", (unsigned int)c);
+		break;
+	}
+
+	teken_state_switch(t, teken_state_init);
+}
+
+/* '^[' */
+static void
+teken_state_1(teken_t *t, teken_char_t c)
+{
+
+	switch (c) {
+	case '7': /* DECSC: Save cursor */
+		teken_subr_save_cursor(t);
+		break;
+	case '8': /* DECRC: Restore cursor */
+		teken_subr_restore_cursor(t);
+		break;
+	case '=': /* DECKPAM: Keypad application mode */
+		teken_subr_keypad_application_mode(t);
+		break;
+	case '>': /* DECKPNM: Keypad numeric mode */
+		teken_subr_keypad_numeric_mode(t);
+		break;
+	case 'D': /* IND: Index */
+		teken_subr_index(t);
+		break;
+	case 'E': /* NEL: Next line */
+		teken_subr_next_line(t);
+		break;
+	case 'H': /* HTS: Horizontal Tab Set */
+		teken_subr_horizontal_tab_set(t);
+		break;
+	case 'M': /* RI: Reverse index */
+		teken_subr_reverse_index(t);
+		break;
+	case 'P': /* DCS: Device Control String */
+		teken_subr_device_control_string(t);
+		break;
+	case ']': /* OSC: Operating System Command */
+		teken_subr_operating_system_command(t);
+		break;
+	case 'c': /* RIS: Reset to Initial State */
+		teken_subr_reset_to_initial_state(t);
+		break;
+	case '\\': /* ST: String Terminator */
+		teken_subr_string_terminator(t);
+		break;
+	case '[':
+		teken_state_switch(t, teken_state_2);
+		return;
+	case '(':
+		teken_state_switch(t, teken_state_6);
+		return;
+	case ')':
+		teken_state_switch(t, teken_state_7);
+		return;
+	case '#':
+		teken_state_switch(t, teken_state_4);
+		return;
+	default:
+		teken_printf("Unsupported sequence in teken_state_1: %u\n", (unsigned int)c);
+		break;
+	}
+
+	teken_state_switch(t, teken_state_init);
+}
+
+/* '^[)' */
+static void
+teken_state_7(teken_t *t, teken_char_t c)
+{
+
+	switch (c) {
+	case '0': /* G1SCS0: G1 SCS Special Graphics */
+		teken_subr_g1_scs_special_graphics(t);
+		break;
+	case '1': /* G1SCS1: G1 SCS US ASCII */
+		teken_subr_g1_scs_us_ascii(t);
+		break;
+	case '2': /* G1SCS2: G1 SCS Special Graphics */
+		teken_subr_g1_scs_special_graphics(t);
+		break;
+	case 'A': /* G1SCSA: G1 SCS UK National */
+		teken_subr_g1_scs_uk_national(t);
+		break;
+	case 'B': /* G1SCSB: G1 SCS US ASCII */
+		teken_subr_g1_scs_us_ascii(t);
+		break;
+	default:
+		teken_printf("Unsupported sequence in teken_state_7: %u\n", (unsigned int)c);
+		break;
+	}
+
+	teken_state_switch(t, teken_state_init);
+}
+
+/* '^[[=' */
+static void
+teken_state_8(teken_t *t, teken_char_t c)
+{
+
+	if (teken_state_numbers(t, c))
+		return;
+
+	switch (c) {
+	case 'B': /* C25BLPD: Cons25 set bell pitch duration */
+		teken_subr_cons25_set_bell_pitch_duration(t, t->t_curnum < 1 ? 0 : t->t_nums[0], t->t_curnum < 2 ? 0 : t->t_nums[1]);
+		break;
+	case 'F': /* C25ADFG: Cons25 set adapter foreground */
+		teken_subr_cons25_set_adapter_foreground(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'G': /* C25ADBG: Cons25 set adapter background */
+		teken_subr_cons25_set_adapter_background(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'S': /* C25CURS: Cons25 set cursor type */
+		teken_subr_cons25_set_cursor_type(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'T': /* C25MODE: Cons25 set terminal mode */
+		teken_subr_cons25_set_terminal_mode(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	default:
+		teken_printf("Unsupported sequence in teken_state_8: %u\n", (unsigned int)c);
+		break;
+	}
+
+	teken_state_switch(t, teken_state_init);
+}
+
+/* '^[[>' */
+static void
+teken_state_3(teken_t *t, teken_char_t c)
+{
+
+	if (teken_state_numbers(t, c))
+		return;
+
+	switch (c) {
+	case 'c': /* DA2: Secondary Device Attributes */
+		teken_subr_secondary_device_attributes(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	default:
+		teken_printf("Unsupported sequence in teken_state_3: %u\n", (unsigned int)c);
+		break;
+	}
+
+	teken_state_switch(t, teken_state_init);
+}
+
+/* '^[[?' */
+static void
+teken_state_5(teken_t *t, teken_char_t c)
+{
+
+	if (teken_state_numbers(t, c))
+		return;
+
+	switch (c) {
+	case 'h': /* DECSM: Set DEC mode */
+		teken_subr_set_dec_mode(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'l': /* DECRM: Reset DEC mode */
+		teken_subr_reset_dec_mode(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	case 'n': /* DSR: Device Status Report */
+		teken_subr_device_status_report(t, t->t_curnum < 1 ? 0 : t->t_nums[0]);
+		break;
+	default:
+		teken_printf("Unsupported sequence in teken_state_5: %u\n", (unsigned int)c);
+		break;
+	}
+
+	teken_state_switch(t, teken_state_init);
+}
+
+/* '^[#' */
+static void
+teken_state_4(teken_t *t, teken_char_t c)
+{
+
+	switch (c) {
+	case '3': /* DECDHL: Double Height Double Width Line Top */
+		teken_subr_double_height_double_width_line_top(t);
+		break;
+	case '4': /* DECDHL: Double Height Double Width Line Bottom */
+		teken_subr_double_height_double_width_line_bottom(t);
+		break;
+	case '5': /* DECSWL: Single Height Single Width Line */
+		teken_subr_single_height_single_width_line(t);
+		break;
+	case '6': /* DECDWL: Single Height Double Width Line */
+		teken_subr_single_height_double_width_line(t);
+		break;
+	case '8': /* DECALN: Alignment test */
+		teken_subr_alignment_test(t);
+		break;
+	default:
+		teken_printf("Unsupported sequence in teken_state_4: %u\n", (unsigned int)c);
+		break;
+	}
+
+	teken_state_switch(t, teken_state_init);
+}
diff --git a/teken/teken_subr.h b/teken/teken_subr.h
new file mode 100644
index 0000000..5dea10b
--- /dev/null
+++ b/teken/teken_subr.h
@@ -0,0 +1,1306 @@
+/*-
+ * Copyright (c) 2008-2009 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: head/sys/teken/teken_subr.h 259761 2013-12-23 05:47:27Z ed $
+ */
+
+static void teken_subr_cursor_up(teken_t *, unsigned int);
+static void teken_subr_erase_line(teken_t *, unsigned int);
+static void teken_subr_regular_character(teken_t *, teken_char_t);
+static void teken_subr_reset_to_initial_state(teken_t *);
+static void teken_subr_save_cursor(teken_t *);
+
+static inline int
+teken_tab_isset(teken_t *t, unsigned int col)
+{
+	unsigned int b, o;
+
+	if (col >= T_NUMCOL)
+		return ((col % 8) == 0);
+
+	b = col / (sizeof(unsigned int) * 8);
+	o = col % (sizeof(unsigned int) * 8);
+
+	return (t->t_tabstops[b] & (1 << o));
+}
+
+static inline void
+teken_tab_clear(teken_t *t, unsigned int col)
+{
+	unsigned int b, o;
+
+	if (col >= T_NUMCOL)
+		return;
+
+	b = col / (sizeof(unsigned int) * 8);
+	o = col % (sizeof(unsigned int) * 8);
+
+	t->t_tabstops[b] &= ~(1 << o);
+}
+
+static inline void
+teken_tab_set(teken_t *t, unsigned int col)
+{
+	unsigned int b, o;
+
+	if (col >= T_NUMCOL)
+		return;
+
+	b = col / (sizeof(unsigned int) * 8);
+	o = col % (sizeof(unsigned int) * 8);
+
+	t->t_tabstops[b] |= 1 << o;
+}
+
+static void
+teken_tab_default(teken_t *t)
+{
+	unsigned int i;
+
+	memset(&t->t_tabstops, 0, T_NUMCOL / 8);
+
+	for (i = 8; i < T_NUMCOL; i += 8)
+		teken_tab_set(t, i);
+}
+
+static void
+teken_subr_do_scroll(teken_t *t, int amount)
+{
+	teken_rect_t tr;
+	teken_pos_t tp;
+
+	teken_assert(t->t_cursor.tp_row <= t->t_winsize.tp_row);
+	teken_assert(t->t_scrollreg.ts_end <= t->t_winsize.tp_row);
+	teken_assert(amount != 0);
+
+	/* Copy existing data 1 line up. */
+	if (amount > 0) {
+		/* Scroll down. */
+
+		/* Copy existing data up. */
+		if (t->t_scrollreg.ts_begin + amount < t->t_scrollreg.ts_end) {
+			tr.tr_begin.tp_row = t->t_scrollreg.ts_begin + amount;
+			tr.tr_begin.tp_col = 0;
+			tr.tr_end.tp_row = t->t_scrollreg.ts_end;
+			tr.tr_end.tp_col = t->t_winsize.tp_col;
+			tp.tp_row = t->t_scrollreg.ts_begin;
+			tp.tp_col = 0;
+			teken_funcs_copy(t, &tr, &tp);
+
+			tr.tr_begin.tp_row = t->t_scrollreg.ts_end - amount;
+		} else {
+			tr.tr_begin.tp_row = t->t_scrollreg.ts_begin;
+		}
+
+		/* Clear the last lines. */
+		tr.tr_begin.tp_col = 0;
+		tr.tr_end.tp_row = t->t_scrollreg.ts_end;
+		tr.tr_end.tp_col = t->t_winsize.tp_col;
+		teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+	} else {
+		/* Scroll up. */
+		amount = -amount;
+
+		/* Copy existing data down. */
+		if (t->t_scrollreg.ts_begin + amount < t->t_scrollreg.ts_end) {
+			tr.tr_begin.tp_row = t->t_scrollreg.ts_begin;
+			tr.tr_begin.tp_col = 0;
+			tr.tr_end.tp_row = t->t_scrollreg.ts_end - amount;
+			tr.tr_end.tp_col = t->t_winsize.tp_col;
+			tp.tp_row = t->t_scrollreg.ts_begin + amount;
+			tp.tp_col = 0;
+			teken_funcs_copy(t, &tr, &tp);
+
+			tr.tr_end.tp_row = t->t_scrollreg.ts_begin + amount;
+		} else {
+			tr.tr_end.tp_row = t->t_scrollreg.ts_end;
+		}
+
+		/* Clear the first lines. */
+		tr.tr_begin.tp_row = t->t_scrollreg.ts_begin;
+		tr.tr_begin.tp_col = 0;
+		tr.tr_end.tp_col = t->t_winsize.tp_col;
+		teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+	}
+}
+
+static ssize_t
+teken_subr_do_cpr(teken_t *t, unsigned int cmd, char response[16])
+{
+
+	switch (cmd) {
+	case 5: /* Operating status. */
+		strcpy(response, "0n");
+		return (2);
+	case 6: { /* Cursor position. */
+		int len;
+
+		len = snprintf(response, 16, "%u;%uR",
+		    (t->t_cursor.tp_row - t->t_originreg.ts_begin) + 1,
+		    t->t_cursor.tp_col + 1);
+
+		if (len >= 16)
+			return (-1);
+		return (len);
+	}
+	case 15: /* Printer status. */
+		strcpy(response, "13n");
+		return (3);
+	case 25: /* UDK status. */
+		strcpy(response, "20n");
+		return (3);
+	case 26: /* Keyboard status. */
+		strcpy(response, "27;1n");
+		return (5);
+	default:
+		teken_printf("Unknown DSR\n");
+		return (-1);
+	}
+}
+
+static void
+teken_subr_alignment_test(teken_t *t)
+{
+	teken_rect_t tr;
+
+	t->t_cursor.tp_row = t->t_cursor.tp_col = 0;
+	t->t_scrollreg.ts_begin = 0;
+	t->t_scrollreg.ts_end = t->t_winsize.tp_row;
+	t->t_originreg = t->t_scrollreg;
+	t->t_stateflags &= ~(TS_WRAPPED|TS_ORIGIN);
+	teken_funcs_cursor(t);
+
+	tr.tr_begin.tp_row = 0;
+	tr.tr_begin.tp_col = 0;
+	tr.tr_end = t->t_winsize;
+	teken_funcs_fill(t, &tr, 'E', &t->t_defattr);
+}
+
+static void
+teken_subr_backspace(teken_t *t)
+{
+
+	if (t->t_stateflags & TS_CONS25) {
+		if (t->t_cursor.tp_col == 0) {
+			if (t->t_cursor.tp_row == t->t_originreg.ts_begin)
+				return;
+			t->t_cursor.tp_row--;
+			t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
+		} else {
+			t->t_cursor.tp_col--;
+		}
+	} else {
+		if (t->t_cursor.tp_col == 0)
+			return;
+
+		t->t_cursor.tp_col--;
+		t->t_stateflags &= ~TS_WRAPPED;
+	}
+
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_bell(teken_t *t)
+{
+
+	teken_funcs_bell(t);
+}
+
+static void
+teken_subr_carriage_return(teken_t *t)
+{
+
+	t->t_cursor.tp_col = 0;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_backward(teken_t *t, unsigned int ncols)
+{
+
+	if (ncols > t->t_cursor.tp_col)
+		t->t_cursor.tp_col = 0;
+	else
+		t->t_cursor.tp_col -= ncols;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_backward_tabulation(teken_t *t, unsigned int ntabs)
+{
+
+	do {
+		/* Stop when we've reached the beginning of the line. */
+		if (t->t_cursor.tp_col == 0)
+			break;
+
+		t->t_cursor.tp_col--;
+
+		/* Tab marker set. */
+		if (teken_tab_isset(t, t->t_cursor.tp_col))
+			ntabs--;
+	} while (ntabs > 0);
+
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_down(teken_t *t, unsigned int nrows)
+{
+
+	if (t->t_cursor.tp_row + nrows >= t->t_scrollreg.ts_end)
+		t->t_cursor.tp_row = t->t_scrollreg.ts_end - 1;
+	else
+		t->t_cursor.tp_row += nrows;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_forward(teken_t *t, unsigned int ncols)
+{
+
+	if (t->t_cursor.tp_col + ncols >= t->t_winsize.tp_col)
+		t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
+	else
+		t->t_cursor.tp_col += ncols;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_forward_tabulation(teken_t *t, unsigned int ntabs)
+{
+
+	do {
+		/* Stop when we've reached the end of the line. */
+		if (t->t_cursor.tp_col == t->t_winsize.tp_col - 1)
+			break;
+
+		t->t_cursor.tp_col++;
+
+		/* Tab marker set. */
+		if (teken_tab_isset(t, t->t_cursor.tp_col))
+			ntabs--;
+	} while (ntabs > 0);
+
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_next_line(teken_t *t, unsigned int ncols)
+{
+
+	t->t_cursor.tp_col = 0;
+	teken_subr_cursor_down(t, ncols);
+}
+
+static void
+teken_subr_cursor_position(teken_t *t, unsigned int row, unsigned int col)
+{
+
+	t->t_cursor.tp_row = t->t_originreg.ts_begin + row - 1;
+	if (t->t_cursor.tp_row >= t->t_originreg.ts_end)
+		t->t_cursor.tp_row = t->t_originreg.ts_end - 1;
+
+	t->t_cursor.tp_col = col - 1;
+	if (t->t_cursor.tp_col >= t->t_winsize.tp_col)
+		t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
+
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_cursor_position_report(teken_t *t, unsigned int cmd)
+{
+	char response[18] = "\x1B[";
+	ssize_t len;
+
+	len = teken_subr_do_cpr(t, cmd, response + 2);
+	if (len < 0)
+		return;
+
+	teken_funcs_respond(t, response, len + 2);
+}
+
+static void
+teken_subr_cursor_previous_line(teken_t *t, unsigned int ncols)
+{
+
+	t->t_cursor.tp_col = 0;
+	teken_subr_cursor_up(t, ncols);
+}
+
+static void
+teken_subr_cursor_up(teken_t *t, unsigned int nrows)
+{
+
+	if (t->t_scrollreg.ts_begin + nrows >= t->t_cursor.tp_row)
+		t->t_cursor.tp_row = t->t_scrollreg.ts_begin;
+	else
+		t->t_cursor.tp_row -= nrows;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_delete_character(teken_t *t, unsigned int ncols)
+{
+	teken_rect_t tr;
+
+	tr.tr_begin.tp_row = t->t_cursor.tp_row;
+	tr.tr_end.tp_row = t->t_cursor.tp_row + 1;
+	tr.tr_end.tp_col = t->t_winsize.tp_col;
+
+	if (t->t_cursor.tp_col + ncols >= t->t_winsize.tp_col) {
+		tr.tr_begin.tp_col = t->t_cursor.tp_col;
+	} else {
+		/* Copy characters to the left. */
+		tr.tr_begin.tp_col = t->t_cursor.tp_col + ncols;
+		teken_funcs_copy(t, &tr, &t->t_cursor);
+
+		tr.tr_begin.tp_col = t->t_winsize.tp_col - ncols;
+	}
+
+	/* Blank trailing columns. */
+	teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_delete_line(teken_t *t, unsigned int nrows)
+{
+	teken_rect_t tr;
+
+	/* Ignore if outside scrolling region. */
+	if (t->t_cursor.tp_row < t->t_scrollreg.ts_begin ||
+	    t->t_cursor.tp_row >= t->t_scrollreg.ts_end)
+		return;
+
+	tr.tr_begin.tp_col = 0;
+	tr.tr_end.tp_row = t->t_scrollreg.ts_end;
+	tr.tr_end.tp_col = t->t_winsize.tp_col;
+
+	if (t->t_cursor.tp_row + nrows >= t->t_scrollreg.ts_end) {
+		tr.tr_begin.tp_row = t->t_cursor.tp_row;
+	} else {
+		teken_pos_t tp;
+
+		/* Copy rows up. */
+		tr.tr_begin.tp_row = t->t_cursor.tp_row + nrows;
+		tp.tp_row = t->t_cursor.tp_row;
+		tp.tp_col = 0;
+		teken_funcs_copy(t, &tr, &tp);
+
+		tr.tr_begin.tp_row = t->t_scrollreg.ts_end - nrows;
+	}
+
+	/* Blank trailing rows. */
+	teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_device_control_string(teken_t *t)
+{
+
+	teken_printf("Unsupported device control string\n");
+	t->t_stateflags |= TS_INSTRING;
+}
+
+static void
+teken_subr_device_status_report(teken_t *t, unsigned int cmd)
+{
+	char response[19] = "\x1B[?";
+	ssize_t len;
+
+	len = teken_subr_do_cpr(t, cmd, response + 3);
+	if (len < 0)
+		return;
+
+	teken_funcs_respond(t, response, len + 3);
+}
+
+static void
+teken_subr_double_height_double_width_line_top(teken_t *t __unused)
+{
+
+	teken_printf("double height double width top\n");
+}
+
+static void
+teken_subr_double_height_double_width_line_bottom(teken_t *t __unused)
+{
+
+	teken_printf("double height double width bottom\n");
+}
+
+static void
+teken_subr_erase_character(teken_t *t, unsigned int ncols)
+{
+	teken_rect_t tr;
+
+	tr.tr_begin = t->t_cursor;
+	tr.tr_end.tp_row = t->t_cursor.tp_row + 1;
+
+	if (t->t_cursor.tp_col + ncols >= t->t_winsize.tp_col)
+		tr.tr_end.tp_col = t->t_winsize.tp_col;
+	else
+		tr.tr_end.tp_col = t->t_cursor.tp_col + ncols;
+
+	teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_erase_display(teken_t *t, unsigned int mode)
+{
+	teken_rect_t r;
+
+	r.tr_begin.tp_col = 0;
+	r.tr_end.tp_col = t->t_winsize.tp_col;
+
+	switch (mode) {
+	case 1: /* Erase from the top to the cursor. */
+		teken_subr_erase_line(t, 1);
+
+		/* Erase lines above. */
+		if (t->t_cursor.tp_row == 0)
+			return;
+		r.tr_begin.tp_row = 0;
+		r.tr_end.tp_row = t->t_cursor.tp_row;
+		break;
+	case 2: /* Erase entire display. */
+		r.tr_begin.tp_row = 0;
+		r.tr_end.tp_row = t->t_winsize.tp_row;
+		break;
+	default: /* Erase from cursor to the bottom. */
+		teken_subr_erase_line(t, 0);
+
+		/* Erase lines below. */
+		if (t->t_cursor.tp_row == t->t_winsize.tp_row - 1)
+			return;
+		r.tr_begin.tp_row = t->t_cursor.tp_row + 1;
+		r.tr_end.tp_row = t->t_winsize.tp_row;
+		break;
+	}
+
+	teken_funcs_fill(t, &r, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_erase_line(teken_t *t, unsigned int mode)
+{
+	teken_rect_t r;
+
+	r.tr_begin.tp_row = t->t_cursor.tp_row;
+	r.tr_end.tp_row = t->t_cursor.tp_row + 1;
+
+	switch (mode) {
+	case 1: /* Erase from the beginning of the line to the cursor. */
+		r.tr_begin.tp_col = 0;
+		r.tr_end.tp_col = t->t_cursor.tp_col + 1;
+		break;
+	case 2: /* Erase entire line. */
+		r.tr_begin.tp_col = 0;
+		r.tr_end.tp_col = t->t_winsize.tp_col;
+		break;
+	default: /* Erase from cursor to the end of the line. */
+		r.tr_begin.tp_col = t->t_cursor.tp_col;
+		r.tr_end.tp_col = t->t_winsize.tp_col;
+		break;
+	}
+
+	teken_funcs_fill(t, &r, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_g0_scs_special_graphics(teken_t *t __unused)
+{
+
+	t->t_scs[0] = teken_scs_special_graphics;
+}
+
+static void
+teken_subr_g0_scs_uk_national(teken_t *t __unused)
+{
+
+	t->t_scs[0] = teken_scs_uk_national;
+}
+
+static void
+teken_subr_g0_scs_us_ascii(teken_t *t __unused)
+{
+
+	t->t_scs[0] = teken_scs_us_ascii;
+}
+
+static void
+teken_subr_g1_scs_special_graphics(teken_t *t __unused)
+{
+
+	t->t_scs[1] = teken_scs_special_graphics;
+}
+
+static void
+teken_subr_g1_scs_uk_national(teken_t *t __unused)
+{
+
+	t->t_scs[1] = teken_scs_uk_national;
+}
+
+static void
+teken_subr_g1_scs_us_ascii(teken_t *t __unused)
+{
+
+	t->t_scs[1] = teken_scs_us_ascii;
+}
+
+static void
+teken_subr_horizontal_position_absolute(teken_t *t, unsigned int col)
+{
+
+	t->t_cursor.tp_col = col - 1;
+	if (t->t_cursor.tp_col >= t->t_winsize.tp_col)
+		t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
+
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_horizontal_tab(teken_t *t)
+{
+
+	teken_subr_cursor_forward_tabulation(t, 1);
+}
+
+static void
+teken_subr_horizontal_tab_set(teken_t *t)
+{
+
+	teken_tab_set(t, t->t_cursor.tp_col);
+}
+
+static void
+teken_subr_index(teken_t *t)
+{
+
+	if (t->t_cursor.tp_row < t->t_scrollreg.ts_end - 1) {
+		t->t_cursor.tp_row++;
+		t->t_stateflags &= ~TS_WRAPPED;
+		teken_funcs_cursor(t);
+	} else {
+		teken_subr_do_scroll(t, 1);
+	}
+}
+
+static void
+teken_subr_insert_character(teken_t *t, unsigned int ncols)
+{
+	teken_rect_t tr;
+
+	tr.tr_begin = t->t_cursor;
+	tr.tr_end.tp_row = t->t_cursor.tp_row + 1;
+
+	if (t->t_cursor.tp_col + ncols >= t->t_winsize.tp_col) {
+		tr.tr_end.tp_col = t->t_winsize.tp_col;
+	} else {
+		teken_pos_t tp;
+
+		/* Copy characters to the right. */
+		tr.tr_end.tp_col = t->t_winsize.tp_col - ncols;
+		tp.tp_row = t->t_cursor.tp_row;
+		tp.tp_col = t->t_cursor.tp_col + ncols;
+		teken_funcs_copy(t, &tr, &tp);
+
+		tr.tr_end.tp_col = t->t_cursor.tp_col + ncols;
+	}
+
+	/* Blank current location. */
+	teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_insert_line(teken_t *t, unsigned int nrows)
+{
+	teken_rect_t tr;
+
+	/* Ignore if outside scrolling region. */
+	if (t->t_cursor.tp_row < t->t_scrollreg.ts_begin ||
+	    t->t_cursor.tp_row >= t->t_scrollreg.ts_end)
+		return;
+
+	tr.tr_begin.tp_row = t->t_cursor.tp_row;
+	tr.tr_begin.tp_col = 0;
+	tr.tr_end.tp_col = t->t_winsize.tp_col;
+
+	if (t->t_cursor.tp_row + nrows >= t->t_scrollreg.ts_end) {
+		tr.tr_end.tp_row = t->t_scrollreg.ts_end;
+	} else {
+		teken_pos_t tp;
+
+		/* Copy lines down. */
+		tr.tr_end.tp_row = t->t_scrollreg.ts_end - nrows;
+		tp.tp_row = t->t_cursor.tp_row + nrows;
+		tp.tp_col = 0;
+		teken_funcs_copy(t, &tr, &tp);
+
+		tr.tr_end.tp_row = t->t_cursor.tp_row + nrows;
+	}
+
+	/* Blank current location. */
+	teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+}
+
+static void
+teken_subr_keypad_application_mode(teken_t *t)
+{
+
+	teken_funcs_param(t, TP_KEYPADAPP, 1);
+}
+
+static void
+teken_subr_keypad_numeric_mode(teken_t *t)
+{
+
+	teken_funcs_param(t, TP_KEYPADAPP, 0);
+}
+
+static void
+teken_subr_newline(teken_t *t)
+{
+
+	t->t_cursor.tp_row++;
+
+	if (t->t_cursor.tp_row >= t->t_scrollreg.ts_end) {
+		teken_subr_do_scroll(t, 1);
+		t->t_cursor.tp_row = t->t_scrollreg.ts_end - 1;
+	}
+
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_newpage(teken_t *t)
+{
+
+	if (t->t_stateflags & TS_CONS25) {
+		teken_rect_t tr;
+
+		/* Clear screen. */
+		tr.tr_begin.tp_row = t->t_originreg.ts_begin;
+		tr.tr_begin.tp_col = 0;
+		tr.tr_end.tp_row = t->t_originreg.ts_end;
+		tr.tr_end.tp_col = t->t_winsize.tp_col;
+		teken_funcs_fill(t, &tr, BLANK, &t->t_curattr);
+
+		/* Cursor at top left. */
+		t->t_cursor.tp_row = t->t_originreg.ts_begin;
+		t->t_cursor.tp_col = 0;
+		t->t_stateflags &= ~TS_WRAPPED;
+		teken_funcs_cursor(t);
+	} else {
+		teken_subr_newline(t);
+	}
+}
+
+static void
+teken_subr_next_line(teken_t *t)
+{
+
+	t->t_cursor.tp_col = 0;
+	teken_subr_newline(t);
+}
+
+static void
+teken_subr_operating_system_command(teken_t *t)
+{
+
+	teken_printf("Unsupported operating system command\n");
+	t->t_stateflags |= TS_INSTRING;
+}
+
+static void
+teken_subr_pan_down(teken_t *t, unsigned int nrows)
+{
+
+	teken_subr_do_scroll(t, (int)nrows);
+}
+
+static void
+teken_subr_pan_up(teken_t *t, unsigned int nrows)
+{
+
+	teken_subr_do_scroll(t, -(int)nrows);
+}
+
+static void
+teken_subr_primary_device_attributes(teken_t *t, unsigned int request)
+{
+
+	if (request == 0) {
+		const char response[] = "\x1B[?1;2c";
+
+		teken_funcs_respond(t, response, sizeof response - 1);
+	} else {
+		teken_printf("Unknown DA1\n");
+	}
+}
+
+static void
+teken_subr_do_putchar(teken_t *t, const teken_pos_t *tp, teken_char_t c,
+    int width)
+{
+
+	if (t->t_stateflags & TS_INSERT &&
+	    tp->tp_col < t->t_winsize.tp_col - width) {
+		teken_rect_t ctr;
+		teken_pos_t ctp;
+
+		/* Insert mode. Move existing characters to the right. */
+		ctr.tr_begin = *tp;
+		ctr.tr_end.tp_row = tp->tp_row + 1;
+		ctr.tr_end.tp_col = t->t_winsize.tp_col - width;
+		ctp.tp_row = tp->tp_row;
+		ctp.tp_col = tp->tp_col + width;
+		teken_funcs_copy(t, &ctr, &ctp);
+	}
+
+	teken_funcs_putchar(t, tp, c, &t->t_curattr);
+
+	if (width == 2 && tp->tp_col + 1 < t->t_winsize.tp_col) {
+		teken_pos_t tp2;
+		teken_attr_t attr;
+
+		/* Print second half of CJK fullwidth character. */
+		tp2.tp_row = tp->tp_row;
+		tp2.tp_col = tp->tp_col + 1;
+		attr = t->t_curattr;
+		attr.ta_format |= TF_CJK_RIGHT;
+		teken_funcs_putchar(t, &tp2, c, &attr);
+	}
+}
+
+static void
+teken_subr_regular_character(teken_t *t, teken_char_t c)
+{
+	int width;
+
+	if (t->t_stateflags & TS_8BIT) {
+		if (!(t->t_stateflags & TS_CONS25) && (c <= 0x1b || c == 0x7f))
+			return;
+		c = teken_scs_process(t, c);
+		width = 1;
+	} else {
+		c = teken_scs_process(t, c);
+		width = teken_wcwidth(c);
+		/* XXX: Don't process zero-width characters yet. */
+		if (width <= 0)
+			return;
+	}
+
+	if (t->t_stateflags & TS_CONS25) {
+		teken_subr_do_putchar(t, &t->t_cursor, c, width);
+		t->t_cursor.tp_col += width;
+
+		if (t->t_cursor.tp_col >= t->t_winsize.tp_col) {
+			if (t->t_cursor.tp_row == t->t_scrollreg.ts_end - 1) {
+				/* Perform scrolling. */
+				teken_subr_do_scroll(t, 1);
+			} else {
+				/* No scrolling needed. */
+				if (t->t_cursor.tp_row <
+				    t->t_winsize.tp_row - 1)
+					t->t_cursor.tp_row++;
+			}
+			t->t_cursor.tp_col = 0;
+		}
+	} else if (t->t_stateflags & TS_AUTOWRAP &&
+	    ((t->t_stateflags & TS_WRAPPED &&
+	    t->t_cursor.tp_col + 1 == t->t_winsize.tp_col) ||
+	    t->t_cursor.tp_col + width > t->t_winsize.tp_col)) {
+		teken_pos_t tp;
+
+		/*
+		 * Perform line wrapping, if:
+		 * - Autowrapping is enabled, and
+		 *   - We're in the wrapped state at the last column, or
+		 *   - The character to be printed does not fit anymore.
+		 */
+		if (t->t_cursor.tp_row == t->t_scrollreg.ts_end - 1) {
+			/* Perform scrolling. */
+			teken_subr_do_scroll(t, 1);
+			tp.tp_row = t->t_scrollreg.ts_end - 1;
+		} else {
+			/* No scrolling needed. */
+			tp.tp_row = t->t_cursor.tp_row + 1;
+			if (tp.tp_row == t->t_winsize.tp_row) {
+				/*
+				 * Corner case: regular character
+				 * outside scrolling region, but at the
+				 * bottom of the screen.
+				 */
+				teken_subr_do_putchar(t, &t->t_cursor,
+				    c, width);
+				return;
+			}
+		}
+
+		tp.tp_col = 0;
+		teken_subr_do_putchar(t, &tp, c, width);
+
+		t->t_cursor.tp_row = tp.tp_row;
+		t->t_cursor.tp_col = width;
+		t->t_stateflags &= ~TS_WRAPPED;
+	} else {
+		/* No line wrapping needed. */
+		teken_subr_do_putchar(t, &t->t_cursor, c, width);
+		t->t_cursor.tp_col += width;
+
+		if (t->t_cursor.tp_col >= t->t_winsize.tp_col) {
+			t->t_stateflags |= TS_WRAPPED;
+			t->t_cursor.tp_col = t->t_winsize.tp_col - 1;
+		} else {
+			t->t_stateflags &= ~TS_WRAPPED;
+		}
+	}
+
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_reset_dec_mode(teken_t *t, unsigned int cmd)
+{
+
+	switch (cmd) {
+	case 1: /* Cursor keys mode. */
+		t->t_stateflags &= ~TS_CURSORKEYS;
+		break;
+	case 2: /* DECANM: ANSI/VT52 mode. */
+		teken_printf("DECRST VT52\n");
+		break;
+	case 3: /* 132 column mode. */
+		teken_funcs_param(t, TP_132COLS, 0);
+		teken_subr_reset_to_initial_state(t);
+		break;
+	case 5: /* Inverse video. */
+		teken_printf("DECRST inverse video\n");
+		break;
+	case 6: /* Origin mode. */
+		t->t_stateflags &= ~TS_ORIGIN;
+		t->t_originreg.ts_begin = 0;
+		t->t_originreg.ts_end = t->t_winsize.tp_row;
+		t->t_cursor.tp_row = t->t_cursor.tp_col = 0;
+		t->t_stateflags &= ~TS_WRAPPED;
+		teken_funcs_cursor(t);
+		break;
+	case 7: /* Autowrap mode. */
+		t->t_stateflags &= ~TS_AUTOWRAP;
+		break;
+	case 8: /* Autorepeat mode. */
+		teken_funcs_param(t, TP_AUTOREPEAT, 0);
+		break;
+	case 25: /* Hide cursor. */
+		teken_funcs_param(t, TP_SHOWCURSOR, 0);
+		break;
+	case 40: /* Disallow 132 columns. */
+		teken_printf("DECRST allow 132\n");
+		break;
+	case 45: /* Disable reverse wraparound. */
+		teken_printf("DECRST reverse wraparound\n");
+		break;
+	case 47: /* Switch to alternate buffer. */
+		teken_printf("Switch to alternate buffer\n");
+		break;
+	case 1000: /* Mouse input. */
+		teken_funcs_param(t, TP_MOUSE, 0);
+		break;
+	default:
+		teken_printf("Unknown DECRST: %u\n", cmd);
+	}
+}
+
+static void
+teken_subr_reset_mode(teken_t *t, unsigned int cmd)
+{
+
+	switch (cmd) {
+	case 4:
+		t->t_stateflags &= ~TS_INSERT;
+		break;
+	default:
+		teken_printf("Unknown reset mode: %u\n", cmd);
+	}
+}
+
+static void
+teken_subr_do_resize(teken_t *t)
+{
+
+	t->t_scrollreg.ts_begin = 0;
+	t->t_scrollreg.ts_end = t->t_winsize.tp_row;
+	t->t_originreg = t->t_scrollreg;
+}
+
+static void
+teken_subr_do_reset(teken_t *t)
+{
+
+	t->t_curattr = t->t_defattr;
+	t->t_cursor.tp_row = t->t_cursor.tp_col = 0;
+	t->t_scrollreg.ts_begin = 0;
+	t->t_scrollreg.ts_end = t->t_winsize.tp_row;
+	t->t_originreg = t->t_scrollreg;
+	t->t_stateflags &= TS_8BIT|TS_CONS25;
+	t->t_stateflags |= TS_AUTOWRAP;
+
+	t->t_scs[0] = teken_scs_us_ascii;
+	t->t_scs[1] = teken_scs_us_ascii;
+	t->t_curscs = 0;
+
+	teken_subr_save_cursor(t);
+	teken_tab_default(t);
+}
+
+static void
+teken_subr_reset_to_initial_state(teken_t *t)
+{
+
+	teken_subr_do_reset(t);
+	teken_subr_erase_display(t, 2);
+	teken_funcs_param(t, TP_SHOWCURSOR, 1);
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_restore_cursor(teken_t *t)
+{
+
+	t->t_cursor = t->t_saved_cursor;
+	t->t_curattr = t->t_saved_curattr;
+	t->t_scs[t->t_curscs] = t->t_saved_curscs;
+	t->t_stateflags &= ~TS_WRAPPED;
+
+	/* Get out of origin mode when the cursor is moved outside. */
+	if (t->t_cursor.tp_row < t->t_originreg.ts_begin ||
+	    t->t_cursor.tp_row >= t->t_originreg.ts_end) {
+		t->t_stateflags &= ~TS_ORIGIN;
+		t->t_originreg.ts_begin = 0;
+		t->t_originreg.ts_end = t->t_winsize.tp_row;
+	}
+
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_reverse_index(teken_t *t)
+{
+
+	if (t->t_cursor.tp_row > t->t_scrollreg.ts_begin) {
+		t->t_cursor.tp_row--;
+		t->t_stateflags &= ~TS_WRAPPED;
+		teken_funcs_cursor(t);
+	} else {
+		teken_subr_do_scroll(t, -1);
+	}
+}
+
+static void
+teken_subr_save_cursor(teken_t *t)
+{
+
+	t->t_saved_cursor = t->t_cursor;
+	t->t_saved_curattr = t->t_curattr;
+	t->t_saved_curscs = t->t_scs[t->t_curscs];
+}
+
+static void
+teken_subr_secondary_device_attributes(teken_t *t, unsigned int request)
+{
+
+	if (request == 0) {
+		const char response[] = "\x1B[>0;10;0c";
+		teken_funcs_respond(t, response, sizeof response - 1);
+	} else {
+		teken_printf("Unknown DA2\n");
+	}
+}
+
+static void
+teken_subr_set_dec_mode(teken_t *t, unsigned int cmd)
+{
+
+	switch (cmd) {
+	case 1: /* Cursor keys mode. */
+		t->t_stateflags |= TS_CURSORKEYS;
+		break;
+	case 2: /* DECANM: ANSI/VT52 mode. */
+		teken_printf("DECSET VT52\n");
+		break;
+	case 3: /* 132 column mode. */
+		teken_funcs_param(t, TP_132COLS, 1);
+		teken_subr_reset_to_initial_state(t);
+		break;
+	case 5: /* Inverse video. */
+		teken_printf("DECSET inverse video\n");
+		break;
+	case 6: /* Origin mode. */
+		t->t_stateflags |= TS_ORIGIN;
+		t->t_originreg = t->t_scrollreg;
+		t->t_cursor.tp_row = t->t_scrollreg.ts_begin;
+		t->t_cursor.tp_col = 0;
+		t->t_stateflags &= ~TS_WRAPPED;
+		teken_funcs_cursor(t);
+		break;
+	case 7: /* Autowrap mode. */
+		t->t_stateflags |= TS_AUTOWRAP;
+		break;
+	case 8: /* Autorepeat mode. */
+		teken_funcs_param(t, TP_AUTOREPEAT, 1);
+		break;
+	case 25: /* Display cursor. */
+		teken_funcs_param(t, TP_SHOWCURSOR, 1);
+		break;
+	case 40: /* Allow 132 columns. */
+		teken_printf("DECSET allow 132\n");
+		break;
+	case 45: /* Enable reverse wraparound. */
+		teken_printf("DECSET reverse wraparound\n");
+		break;
+	case 47: /* Switch to alternate buffer. */
+		teken_printf("Switch away from alternate buffer\n");
+		break;
+	case 1000: /* Mouse input. */
+		teken_funcs_param(t, TP_MOUSE, 1);
+		break;
+	default:
+		teken_printf("Unknown DECSET: %u\n", cmd);
+	}
+}
+
+static void
+teken_subr_set_mode(teken_t *t, unsigned int cmd)
+{
+
+	switch (cmd) {
+	case 4:
+		teken_printf("Insert mode\n");
+		t->t_stateflags |= TS_INSERT;
+		break;
+	default:
+		teken_printf("Unknown set mode: %u\n", cmd);
+	}
+}
+
+static void
+teken_subr_set_graphic_rendition(teken_t *t, unsigned int ncmds,
+    unsigned int cmds[])
+{
+	unsigned int i, n;
+
+	/* No attributes means reset. */
+	if (ncmds == 0) {
+		t->t_curattr = t->t_defattr;
+		return;
+	}
+
+	for (i = 0; i < ncmds; i++) {
+		n = cmds[i];
+
+		switch (n) {
+		case 0: /* Reset. */
+			t->t_curattr = t->t_defattr;
+			break;
+		case 1: /* Bold. */
+			t->t_curattr.ta_format |= TF_BOLD;
+			break;
+		case 4: /* Underline. */
+			t->t_curattr.ta_format |= TF_UNDERLINE;
+			break;
+		case 5: /* Blink. */
+			t->t_curattr.ta_format |= TF_BLINK;
+			break;
+		case 7: /* Reverse. */
+			t->t_curattr.ta_format |= TF_REVERSE;
+			break;
+		case 22: /* Remove bold. */
+			t->t_curattr.ta_format &= ~TF_BOLD;
+			break;
+		case 24: /* Remove underline. */
+			t->t_curattr.ta_format &= ~TF_UNDERLINE;
+			break;
+		case 25: /* Remove blink. */
+			t->t_curattr.ta_format &= ~TF_BLINK;
+			break;
+		case 27: /* Remove reverse. */
+			t->t_curattr.ta_format &= ~TF_REVERSE;
+			break;
+		case 30: /* Set foreground color: black */
+		case 31: /* Set foreground color: red */
+		case 32: /* Set foreground color: green */
+		case 33: /* Set foreground color: brown */
+		case 34: /* Set foreground color: blue */
+		case 35: /* Set foreground color: magenta */
+		case 36: /* Set foreground color: cyan */
+		case 37: /* Set foreground color: white */
+			t->t_curattr.ta_fgcolor = n - 30;
+			break;
+		case 38: /* Set foreground color: 256 color mode */
+			if (i + 2 >= ncmds || cmds[i + 1] != 5)
+				continue;
+			t->t_curattr.ta_fgcolor = cmds[i + 2];
+			i += 2;
+			break;
+		case 39: /* Set default foreground color. */
+			t->t_curattr.ta_fgcolor = t->t_defattr.ta_fgcolor;
+			break;
+		case 40: /* Set background color: black */
+		case 41: /* Set background color: red */
+		case 42: /* Set background color: green */
+		case 43: /* Set background color: brown */
+		case 44: /* Set background color: blue */
+		case 45: /* Set background color: magenta */
+		case 46: /* Set background color: cyan */
+		case 47: /* Set background color: white */
+			t->t_curattr.ta_bgcolor = n - 40;
+			break;
+		case 48: /* Set background color: 256 color mode */
+			if (i + 2 >= ncmds || cmds[i + 1] != 5)
+				continue;
+			t->t_curattr.ta_bgcolor = cmds[i + 2];
+			i += 2;
+			break;
+		case 49: /* Set default background color. */
+			t->t_curattr.ta_bgcolor = t->t_defattr.ta_bgcolor;
+			break;
+		case 90: /* Set bright foreground color: black */
+		case 91: /* Set bright foreground color: red */
+		case 92: /* Set bright foreground color: green */
+		case 93: /* Set bright foreground color: brown */
+		case 94: /* Set bright foreground color: blue */
+		case 95: /* Set bright foreground color: magenta */
+		case 96: /* Set bright foreground color: cyan */
+		case 97: /* Set bright foreground color: white */
+			t->t_curattr.ta_fgcolor = n - 90 + 8;
+			break;
+		case 100: /* Set bright background color: black */
+		case 101: /* Set bright background color: red */
+		case 102: /* Set bright background color: green */
+		case 103: /* Set bright background color: brown */
+		case 104: /* Set bright background color: blue */
+		case 105: /* Set bright background color: magenta */
+		case 106: /* Set bright background color: cyan */
+		case 107: /* Set bright background color: white */
+			t->t_curattr.ta_bgcolor = n - 100 + 8;
+			break;
+		default:
+			teken_printf("unsupported attribute %u\n", n);
+		}
+	}
+}
+
+static void
+teken_subr_set_top_and_bottom_margins(teken_t *t, unsigned int top,
+    unsigned int bottom)
+{
+
+	/* Adjust top row number. */
+	if (top > 0)
+		top--;
+	/* Adjust bottom row number. */
+	if (bottom == 0 || bottom > t->t_winsize.tp_row)
+		bottom = t->t_winsize.tp_row;
+
+	/* Invalid arguments. */
+	if (top >= bottom - 1) {
+		top = 0;
+		bottom = t->t_winsize.tp_row;
+	}
+
+	/* Apply scrolling region. */
+	t->t_scrollreg.ts_begin = top;
+	t->t_scrollreg.ts_end = bottom;
+	if (t->t_stateflags & TS_ORIGIN)
+		t->t_originreg = t->t_scrollreg;
+
+	/* Home cursor to the top left of the scrolling region. */
+	t->t_cursor.tp_row = t->t_originreg.ts_begin;
+	t->t_cursor.tp_col = 0;
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
+
+static void
+teken_subr_single_height_double_width_line(teken_t *t __unused)
+{
+
+	teken_printf("single height double width???\n");
+}
+
+static void
+teken_subr_single_height_single_width_line(teken_t *t __unused)
+{
+
+	teken_printf("single height single width???\n");
+}
+
+static void
+teken_subr_string_terminator(teken_t *t __unused)
+{
+
+	/*
+	 * Strings are already terminated in teken_input_char() when ^[
+	 * is inserted.
+	 */
+}
+
+static void
+teken_subr_tab_clear(teken_t *t, unsigned int cmd)
+{
+
+	switch (cmd) {
+	case 0:
+		teken_tab_clear(t, t->t_cursor.tp_col);
+		break;
+	case 3:
+		memset(&t->t_tabstops, 0, T_NUMCOL / 8);
+		break;
+	}
+}
+
+static void
+teken_subr_vertical_position_absolute(teken_t *t, unsigned int row)
+{
+
+	t->t_cursor.tp_row = t->t_originreg.ts_begin + row - 1;
+	if (t->t_cursor.tp_row >= t->t_originreg.ts_end)
+		t->t_cursor.tp_row = t->t_originreg.ts_end - 1;
+
+	t->t_stateflags &= ~TS_WRAPPED;
+	teken_funcs_cursor(t);
+}
diff --git a/teken/teken_subr_compat.h b/teken/teken_subr_compat.h
new file mode 100644
index 0000000..826a854
--- /dev/null
+++ b/teken/teken_subr_compat.h
@@ -0,0 +1,126 @@
+/*-
+ * Copyright (c) 2008-2009 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: head/sys/teken/teken_subr_compat.h 214817 2010-11-05 00:56:21Z ed $
+ */
+
+static void
+teken_subr_cons25_set_cursor_type(teken_t *t, unsigned int type)
+{
+
+	teken_funcs_param(t, TP_SHOWCURSOR, type != 1);
+}
+
+static const teken_color_t cons25_colors[8] = { TC_BLACK, TC_BLUE,
+    TC_GREEN, TC_CYAN, TC_RED, TC_MAGENTA, TC_BROWN, TC_WHITE };
+
+static void
+teken_subr_cons25_set_adapter_background(teken_t *t, unsigned int c)
+{
+
+	t->t_defattr.ta_bgcolor = cons25_colors[c % 8];
+	t->t_curattr.ta_bgcolor = cons25_colors[c % 8];
+}
+
+static void
+teken_subr_cons25_set_adapter_foreground(teken_t *t, unsigned int c)
+{
+
+	t->t_defattr.ta_fgcolor = cons25_colors[c % 8];
+	t->t_curattr.ta_fgcolor = cons25_colors[c % 8];
+	if (c >= 8) {
+		t->t_defattr.ta_format |= TF_BOLD;
+		t->t_curattr.ta_format |= TF_BOLD;
+	} else {
+		t->t_defattr.ta_format &= ~TF_BOLD;
+		t->t_curattr.ta_format &= ~TF_BOLD;
+	}
+}
+
+static const teken_color_t cons25_revcolors[8] = { 0, 4, 2, 6, 1, 5, 3, 7 };
+
+void
+teken_get_defattr_cons25(teken_t *t, int *fg, int *bg)
+{
+
+	*fg = cons25_revcolors[teken_256to8(t->t_defattr.ta_fgcolor)];
+	if (t->t_defattr.ta_format & TF_BOLD)
+		*fg += 8;
+	*bg = cons25_revcolors[teken_256to8(t->t_defattr.ta_bgcolor)];
+}
+
+static void
+teken_subr_cons25_switch_virtual_terminal(teken_t *t, unsigned int vt)
+{
+
+	teken_funcs_param(t, TP_SWITCHVT, vt);
+}
+
+static void
+teken_subr_cons25_set_bell_pitch_duration(teken_t *t, unsigned int pitch,
+    unsigned int duration)
+{
+
+	teken_funcs_param(t, TP_SETBELLPD, (pitch << 16) |
+	    (duration & 0xffff));
+}
+
+static void
+teken_subr_cons25_set_graphic_rendition(teken_t *t, unsigned int cmd,
+    unsigned int param __unused)
+{
+
+	switch (cmd) {
+	case 0: /* Reset. */
+		t->t_curattr = t->t_defattr;
+		break;
+	default:
+		teken_printf("unsupported attribute %u\n", cmd);
+	}
+}
+
+static void
+teken_subr_cons25_set_terminal_mode(teken_t *t, unsigned int mode)
+{
+
+	switch (mode) {
+	case 0:	/* Switch terminal to xterm. */
+		t->t_stateflags &= ~TS_CONS25;
+		break;
+	case 1: /* Switch terminal to cons25. */
+		t->t_stateflags |= TS_CONS25;
+		break;
+	}
+}
+
+#if 0
+static void
+teken_subr_vt52_decid(teken_t *t)
+{
+	const char response[] = "\x1B/Z";
+
+	teken_funcs_respond(t, response, sizeof response - 1);
+}
+#endif
diff --git a/teken/teken_wcwidth.h b/teken/teken_wcwidth.h
new file mode 100644
index 0000000..ef6da10
--- /dev/null
+++ b/teken/teken_wcwidth.h
@@ -0,0 +1,120 @@
+/*
+ * Markus Kuhn -- 2007-05-26 (Unicode 5.0)
+ *
+ * Permission to use, copy, modify, and distribute this software
+ * for any purpose and without fee is hereby granted. The author
+ * disclaims all warranties with regard to this software.
+ *
+ * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
+ *
+ * $FreeBSD: head/sys/teken/teken_wcwidth.h 186681 2009-01-01 13:26:53Z ed $
+ */
+
+struct interval {
+  teken_char_t first;
+  teken_char_t last;
+};
+
+/* auxiliary function for binary search in interval table */
+static int bisearch(teken_char_t ucs, const struct interval *table, int max) {
+  int min = 0;
+  int mid;
+
+  if (ucs < table[0].first || ucs > table[max].last)
+    return 0;
+  while (max >= min) {
+    mid = (min + max) / 2;
+    if (ucs > table[mid].last)
+      min = mid + 1;
+    else if (ucs < table[mid].first)
+      max = mid - 1;
+    else
+      return 1;
+  }
+
+  return 0;
+}
+
+static int teken_wcwidth(teken_char_t ucs)
+{
+  /* sorted list of non-overlapping intervals of non-spacing characters */
+  /* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
+  static const struct interval combining[] = {
+    { 0x0300, 0x036F }, { 0x0483, 0x0486 }, { 0x0488, 0x0489 },
+    { 0x0591, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
+    { 0x05C4, 0x05C5 }, { 0x05C7, 0x05C7 }, { 0x0600, 0x0603 },
+    { 0x0610, 0x0615 }, { 0x064B, 0x065E }, { 0x0670, 0x0670 },
+    { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
+    { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
+    { 0x07A6, 0x07B0 }, { 0x07EB, 0x07F3 }, { 0x0901, 0x0902 },
+    { 0x093C, 0x093C }, { 0x0941, 0x0948 }, { 0x094D, 0x094D },
+    { 0x0951, 0x0954 }, { 0x0962, 0x0963 }, { 0x0981, 0x0981 },
+    { 0x09BC, 0x09BC }, { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD },
+    { 0x09E2, 0x09E3 }, { 0x0A01, 0x0A02 }, { 0x0A3C, 0x0A3C },
+    { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D },
+    { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC },
+    { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD },
+    { 0x0AE2, 0x0AE3 }, { 0x0B01, 0x0B01 }, { 0x0B3C, 0x0B3C },
+    { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 }, { 0x0B4D, 0x0B4D },
+    { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 }, { 0x0BC0, 0x0BC0 },
+    { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 }, { 0x0C46, 0x0C48 },
+    { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 }, { 0x0CBC, 0x0CBC },
+    { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
+    { 0x0CE2, 0x0CE3 }, { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D },
+    { 0x0DCA, 0x0DCA }, { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 },
+    { 0x0E31, 0x0E31 }, { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E },
+    { 0x0EB1, 0x0EB1 }, { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC },
+    { 0x0EC8, 0x0ECD }, { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 },
+    { 0x0F37, 0x0F37 }, { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E },
+    { 0x0F80, 0x0F84 }, { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 },
+    { 0x0F99, 0x0FBC }, { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 },
+    { 0x1032, 0x1032 }, { 0x1036, 0x1037 }, { 0x1039, 0x1039 },
+    { 0x1058, 0x1059 }, { 0x1160, 0x11FF }, { 0x135F, 0x135F },
+    { 0x1712, 0x1714 }, { 0x1732, 0x1734 }, { 0x1752, 0x1753 },
+    { 0x1772, 0x1773 }, { 0x17B4, 0x17B5 }, { 0x17B7, 0x17BD },
+    { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x17DD, 0x17DD },
+    { 0x180B, 0x180D }, { 0x18A9, 0x18A9 }, { 0x1920, 0x1922 },
+    { 0x1927, 0x1928 }, { 0x1932, 0x1932 }, { 0x1939, 0x193B },
+    { 0x1A17, 0x1A18 }, { 0x1B00, 0x1B03 }, { 0x1B34, 0x1B34 },
+    { 0x1B36, 0x1B3A }, { 0x1B3C, 0x1B3C }, { 0x1B42, 0x1B42 },
+    { 0x1B6B, 0x1B73 }, { 0x1DC0, 0x1DCA }, { 0x1DFE, 0x1DFF },
+    { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x2060, 0x2063 },
+    { 0x206A, 0x206F }, { 0x20D0, 0x20EF }, { 0x302A, 0x302F },
+    { 0x3099, 0x309A }, { 0xA806, 0xA806 }, { 0xA80B, 0xA80B },
+    { 0xA825, 0xA826 }, { 0xFB1E, 0xFB1E }, { 0xFE00, 0xFE0F },
+    { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF }, { 0xFFF9, 0xFFFB },
+    { 0x10A01, 0x10A03 }, { 0x10A05, 0x10A06 }, { 0x10A0C, 0x10A0F },
+    { 0x10A38, 0x10A3A }, { 0x10A3F, 0x10A3F }, { 0x1D167, 0x1D169 },
+    { 0x1D173, 0x1D182 }, { 0x1D185, 0x1D18B }, { 0x1D1AA, 0x1D1AD },
+    { 0x1D242, 0x1D244 }, { 0xE0001, 0xE0001 }, { 0xE0020, 0xE007F },
+    { 0xE0100, 0xE01EF }
+  };
+
+  /* test for 8-bit control characters */
+  if (ucs == 0)
+    return 0;
+  if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
+    return -1;
+
+  /* binary search in table of non-spacing characters */
+  if (bisearch(ucs, combining,
+	       sizeof(combining) / sizeof(struct interval) - 1))
+    return 0;
+
+  /* if we arrive here, ucs is not a combining or C0/C1 control character */
+
+  return 1 + 
+    (ucs >= 0x1100 &&
+     (ucs <= 0x115f ||                    /* Hangul Jamo init. consonants */
+      ucs == 0x2329 || ucs == 0x232a ||
+      (ucs >= 0x2e80 && ucs <= 0xa4cf &&
+       ucs != 0x303f) ||                  /* CJK ... Yi */
+      (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
+      (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
+      (ucs >= 0xfe10 && ucs <= 0xfe19) || /* Vertical forms */
+      (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
+      (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
+      (ucs >= 0xffe0 && ucs <= 0xffe6) ||
+      (ucs >= 0x20000 && ucs <= 0x2fffd) ||
+      (ucs >= 0x30000 && ucs <= 0x3fffd)));
+}