Adding upstream version 2:9.0.1378.upstream/2%9.0.1378 upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
author: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-07 08:50:31 +0000
committer: Daniel Baumann <daniel.baumann@progress-linux.org> 2024-04-07 08:50:31 +0000
commit: aed8ce9da277f5ecffe968b324f242c41c3b752a (patch)
tree: d2e538394cb7a8a7c42a4aac6ccf1a8e3256999b /src/libvterm
parent: Initial commit. (diff)
download: vim-aed8ce9da277f5ecffe968b324f242c41c3b752a.tar.xz
vim-aed8ce9da277f5ecffe968b324f242c41c3b752a.zip
74 files changed, 13404 insertions, 0 deletions
diff --git a/src/libvterm/.bzrignore b/src/libvterm/.bzrignore
new file mode 100644
index 0000000..e58c036
--- /dev/null
+++ b/src/libvterm/.bzrignore
@@ -0,0 +1,13 @@
+.libs
+*.lo
+*.la
+
+bin/*
+!bin/*.c
+
+pangoterm
+t/test
+t/suites.h
+t/externs.h
+t/harness
+src/encoding/*.inc
diff --git a/src/libvterm/.gitignore b/src/libvterm/.gitignore
new file mode 100644
index 0000000..5e5e308
--- /dev/null
+++ b/src/libvterm/.gitignore
@@ -0,0 +1,17 @@
+*~
+*.swp
+
+tags
+src/*.o
+src/*.lo
+
+libvterm.la
+bin/unterm
+bin/vterm-ctrl
+bin/vterm-dump
+
+t/harness
+t/harness.lo
+t/harness.o
+
+.libs/
diff --git a/src/libvterm/CONTRIBUTING b/src/libvterm/CONTRIBUTING
new file mode 100644
index 0000000..e9a8f0c
--- /dev/null
+++ b/src/libvterm/CONTRIBUTING
@@ -0,0 +1,22 @@
+How to Contribute
+-----------------
+
+The main resources for this library are:
+
+  Launchpad
+    https://launchpad.net/libvterm
+
+  IRC:
+    ##tty or #tickit on irc.libera.chat
+
+  Email:
+    Paul "LeoNerd" Evans <leonerd@leonerd.org.uk>
+
+
+Bug reports and feature requests can be sent to any of the above resources.
+
+New features, bug patches, etc.. should in the first instance be discussed via
+any of the resources listed above, before starting work on the actual code.
+There may be future plans or development already in-progress that could be
+affected so it is better to discuss the ideas first before starting work
+actually writing any code.
diff --git a/src/libvterm/LICENSE b/src/libvterm/LICENSE
new file mode 100644
index 0000000..0d05163
--- /dev/null
+++ b/src/libvterm/LICENSE
@@ -0,0 +1,23 @@
+
+
+The MIT License
+
+Copyright (c) 2008 Paul Evans <leonerd@leonerd.org.uk>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
diff --git a/src/libvterm/Makefile b/src/libvterm/Makefile
new file mode 100644
index 0000000..ba4a315
--- /dev/null
+++ b/src/libvterm/Makefile
@@ -0,0 +1,142 @@
+ifeq ($(shell uname),Darwin)
+  LIBTOOL ?= glibtool
+else
+  LIBTOOL ?= libtool
+endif
+
+ifneq ($(VERBOSE),1)
+  LIBTOOL +=--quiet
+endif
+
+override CFLAGS +=-Wall -Iinclude -std=c99 -Wpedantic -DINLINE=""
+
+ifeq ($(shell uname),SunOS)
+  override CFLAGS +=-D__EXTENSIONS__ -D_XPG6 -D__XOPEN_OR_POSIX
+endif
+
+ifeq ($(DEBUG),1)
+  override CFLAGS +=-ggdb -DDEBUG
+endif
+
+ifeq ($(PROFILE),1)
+  override CFLAGS +=-pg
+  override LDFLAGS+=-pg
+endif
+
+CFILES=$(sort $(wildcard src/*.c))
+HFILES=$(sort $(wildcard include/*.h))
+OBJECTS=$(CFILES:.c=.lo)
+LIBRARY=libvterm.la
+
+BINFILES_SRC=$(sort $(wildcard bin/*.c))
+BINFILES=$(BINFILES_SRC:.c=)
+
+TBLFILES=$(sort $(wildcard src/encoding/*.tbl))
+INCFILES=$(TBLFILES:.tbl=.inc)
+
+HFILES_INT=$(sort $(wildcard src/*.h)) $(HFILES)
+
+VERSION_MAJOR=0
+VERSION_MINOR=3
+
+VERSION_CURRENT=0
+VERSION_REVISION=0
+VERSION_AGE=0
+
+VERSION=$(VERSION_MAJOR).$(VERSION_MINOR)
+
+PREFIX=/usr/local
+BINDIR=$(PREFIX)/bin
+LIBDIR=$(PREFIX)/lib
+INCDIR=$(PREFIX)/include
+MANDIR=$(PREFIX)/share/man
+MAN3DIR=$(MANDIR)/man3
+
+# Uncomment to check for memory access errors with valgrind.
+# VALGRIND=1
+
+all: $(LIBRARY) $(BINFILES)
+
+$(LIBRARY): $(OBJECTS)
+	$(LIBTOOL) --mode=link --tag=CC $(CC) -rpath $(LIBDIR) -version-info $(VERSION_CURRENT):$(VERSION_REVISION):$(VERSION_AGE) -o $@ $^ $(LDFLAGS)
+
+src/%.lo: src/%.c $(HFILES_INT)
+	$(LIBTOOL) --mode=compile --tag=CC $(CC) $(CFLAGS) -o $@ -c $<
+
+src/encoding/%.inc: src/encoding/%.tbl
+	perl -CSD tbl2inc_c.pl $< >$@
+
+src/fullwidth.inc:
+	@perl find-wide-chars.pl >$@
+
+src/encoding.lo: $(INCFILES)
+
+bin/%: bin/%.c $(LIBRARY)
+	$(LIBTOOL) --mode=link --tag=CC $(CC) $(CFLAGS) -o $@ $< -lvterm $(LDFLAGS)
+
+t/harness.lo: t/harness.c $(HFILES)
+	$(LIBTOOL) --mode=compile --tag=CC $(CC) $(CFLAGS) -o $@ -c $<
+
+t/harness: t/harness.lo $(LIBRARY)
+	$(LIBTOOL) --mode=link --tag=CC $(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS) -static
+
+.PHONY: test
+test: $(LIBRARY) t/harness
+	for T in `ls t/[0-9]*.test`; do echo "** $$T **"; perl t/run-test.pl $$T $(if $(VALGRIND),--valgrind) || exit 1; done
+
+.PHONY: clean
+clean:
+	$(LIBTOOL) --mode=clean rm -f $(OBJECTS) $(INCFILES)
+	$(LIBTOOL) --mode=clean rm -f t/harness.lo t/harness
+	$(LIBTOOL) --mode=clean rm -f $(LIBRARY) $(BINFILES)
+
+.PHONY: install
+install: install-inc install-lib install-bin
+
+install-inc:
+	install -d $(DESTDIR)$(INCDIR)
+	install -m644 $(HFILES) $(DESTDIR)$(INCDIR)
+	install -d $(DESTDIR)$(LIBDIR)/pkgconfig
+	sed -e "s,@INCDIR@,$(INCDIR)," -e "s,@LIBDIR@,$(LIBDIR)," -e "s,@VERSION@,$(VERSION)," <vterm.pc.in >$(DESTDIR)$(LIBDIR)/pkgconfig/vterm.pc
+
+install-lib: $(LIBRARY)
+	install -d $(DESTDIR)$(LIBDIR)
+	$(LIBTOOL) --mode=install install $(LIBRARY) $(DESTDIR)$(LIBDIR)/$(LIBRARY)
+	$(LIBTOOL) --mode=finish $(DESTDIR)$(LIBDIR)
+
+install-bin: $(BINFILES)
+	install -d $(DESTDIR)$(BINDIR)
+	$(LIBTOOL) --mode=install install $(BINFILES) $(DESTDIR)$(BINDIR)/
+
+# DIST CUT
+
+DISTDIR=libvterm-$(VERSION)
+
+distdir: $(INCFILES)
+	mkdir __distdir
+	cp LICENSE CONTRIBUTING __distdir
+	mkdir __distdir/src
+	cp src/*.c src/*.h src/*.inc __distdir/src
+	mkdir __distdir/src/encoding
+	cp src/encoding/*.inc __distdir/src/encoding
+	mkdir __distdir/include
+	cp include/*.h __distdir/include
+	mkdir __distdir/bin
+	cp bin/*.c __distdir/bin
+	mkdir __distdir/t
+	cp t/*.test t/harness.c t/run-test.pl __distdir/t
+	sed "s,@VERSION@,$(VERSION)," <vterm.pc.in >__distdir/vterm.pc.in
+	sed "/^# DIST CUT/Q" <Makefile >__distdir/Makefile
+	mv __distdir $(DISTDIR)
+
+TARBALL=$(DISTDIR).tar.gz
+
+dist: distdir
+	tar -czf $(TARBALL) $(DISTDIR)
+	rm -rf $(DISTDIR)
+
+dist+bzr:
+	$(MAKE) dist VERSION=$(VERSION)+bzr`bzr revno`
+
+distdir+bzr:
+	$(MAKE) distdir VERSION=$(VERSION)+bzr`bzr revno`
diff --git a/src/libvterm/README b/src/libvterm/README
new file mode 100644
index 0000000..2641284
--- /dev/null
+++ b/src/libvterm/README
@@ -0,0 +1,39 @@
+This is a MODIFIED version of libvterm.
+
+The original can be found:
+- on the original site (tar archive and Bazaar repository):
+	http://www.leonerd.org.uk/code/libvterm/
+- cloned on Github:
+	https://github.com/neovim/libvterm
+
+Modifications:
+- revisions up to 817 have been included
+- Added a .gitignore file.
+- use TRUE and FALSE instead of true and false
+- use int or unsigned int instead of bool
+- Converted some code from C99 to C90.
+- Other changes to support embedding in Vim.
+
+To get the latest version of libvterm you need the "bzr" command and do:
+   bzr co http://bazaar.leonerd.org.uk/c/libvterm/
+
+To find the diff of a libvterm revision edit this URL, changing "999" to the
+patch number:
+    https://bazaar.launchpad.net/~libvterm/libvterm/trunk/diff/999?context=3
+
+To merge in changes from Github, do this:
+- Commit any pending changes.
+- Setup the merge tool:
+    git config merge.tool vimdiff
+    git config merge.conflictstyle diff3
+    git config mergetool.prompt false
+- Run the merge tool:
+    git mergetool
+  This will open a four-way diff between:
+     LOCAL  - your current version
+     BASE   - version as it was at your last sync
+     REMOTE - version at head on Github
+     MERGED - best-effort merge of LOCAL and REMOTE
+  Now find places where automatic merge didn't work, they are marked with
+  <<<<<<<<, ======= and >>>>>>>
+  Fix those places in MERGED, remove the markers, and save the file :wqall.
diff --git a/src/libvterm/doc/URLs b/src/libvterm/doc/URLs
new file mode 100644
index 0000000..8380f5c
--- /dev/null
+++ b/src/libvterm/doc/URLs
@@ -0,0 +1,14 @@
+ECMA-48:
+  http://www.ecma-international.org/publications/standards/Ecma-048.htm
+
+Xterm Control Sequences:
+  http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
+
+Digital VT100 User Guide:
+  http://vt100.net/docs/vt100-ug/
+
+Digital VT220 Programmer Reference Manual
+  http://vt100.net/docs/vt220-rm/
+
+Summary of ANSI standards for ASCII terminals
+  http://www.inwap.com/pdp10/ansicode.txt
diff --git a/src/libvterm/doc/seqs.txt b/src/libvterm/doc/seqs.txt
new file mode 100644
index 0000000..27f28b9
--- /dev/null
+++ b/src/libvterm/doc/seqs.txt
@@ -0,0 +1,283 @@
+Sequences documented in parens are implicit ones from parser.c, which move
+between states.
+
+1 = VT100
+2 = VT220
+3 = VT320
+x = xterm
+
+    C0 controls
+
+123    0x00             = NUL
+123x   0x07             = BEL
+123x   0x08             = BS
+123x   0x09             = HT
+123x   0x0A             = LF
+123x   0x0B             = VT
+123x   0x0C             = FF
+123x   0x0D             = CR
+123x   0x0E             = LS1
+123x   0x0F             = LS0
+      (0x18             = CAN)
+      (0x1A             = SUB)
+      (0x1B             = ESC)
+
+123    0x7f             = DEL (ignored)
+
+    C1 controls
+
+123x   0x84             = IND
+123x   0x85             = NEL
+123x   0x88             = HTS
+123x   0x8D             = RI
+ 23x   0x8E             = SS2
+ 23x   0x8F             = SS3
+      (0x90             = DCS)
+      (0x98             = SOS)
+      (0x9B             = CSI)
+      (0x9C             = ST)
+      (0x9D             = OSC)
+      (0x9E             = PM)
+      (0x9F             = APC)
+
+    Escape sequences
+     - excluding sequences that are C1 aliases
+
+123x   ESC (            = SCS, select character set G0
+123x   ESC )            = SCS, select character set G1
+ 23x   ESC *            = SCS, select character set G2
+ 23x   ESC +            = SCS, select character set G3
+123x   ESC 7            = DECSC - save cursor
+123x   ESC 8            = DECRC - restore cursor
+123x   ESC # 3          = DECDHL, double-height line (top half)
+123x   ESC # 4          = DECDHL, double-height line (bottom half)
+123x   ESC # 5          = DECSWL, single-width single-height line
+123x   ESC # 6          = DECDWL, double-width single-height line
+123x   ESC # 8          = DECALN
+123    ESC <            = Ignored (used by VT100 to exit VT52 mode)
+123x   ESC =            = DECKPAM, keypad application mode
+123x   ESC >            = DECKPNM, keypad numeric mode
+ 23x   ESC Sp F         = S7C1T
+ 23x   ESC Sp G         = S8C1T
+      (ESC P            = DCS)
+      (ESC X            = SOS)
+      (ESC [            = CSI)
+      (ESC \            = ST)
+      (ESC ]            = OSC)
+      (ESC ^            = PM)
+      (ESC _            = APC)
+123x   ESC c            = RIS, reset initial state
+  3x   ESC n            = LS2
+  3x   ESC o            = LS3
+  3x   ESC |            = LS3R
+  3x   ESC }            = LS2R
+  3x   ESC ~            = LS1R
+
+    DCSes
+
+  3x   DCS $ q      ST  = DECRQSS
+  3x           m        =   Request SGR
+   x           Sp q     =   Request DECSCUSR
+  3x           " q      =   Request DECSCA
+  3x           r        =   Request DECSTBM
+   x           s        =   Request DECSLRM
+
+    CSIs
+ 23x   CSI @            = ICH
+123x   CSI A            = CUU
+123x   CSI B            = CUD
+123x   CSI C            = CUF
+123x   CSI D            = CUB
+   x   CSI E            = CNL
+   x   CSI F            = CPL
+   x   CSI G            = CHA
+123x   CSI H            = CUP
+   x   CSI I            = CHT
+123x   CSI J            = ED
+ 23x   CSI ? J          = DECSED, selective erase in display
+123x   CSI K            = EL
+ 23x   CSI ? K          = DECSEL, selective erase in line
+ 23x   CSI L            = IL
+ 23x   CSI M            = DL
+ 23x   CSI P            = DCH
+   x   CSI S            = SU
+   x   CSI T            = SD
+ 23x   CSI X            = ECH
+   x   CSI Z            = CBT
+   x   CSI `            = HPA
+   x   CSI a            = HPR
+   x   CSI b            = REP
+123x   CSI   c          = DA, device attributes
+123        0            =   DA
+ 23x   CSI >   c        = DECSDA
+ 23          0          =   SDA
+   x   CSI d            = VPA
+   x   CSI e            = VPR
+123x   CSI f            = HVP
+123x   CSI g            = TBC
+123x   CSI h            = SM, Set mode
+123x   CSI ? h          = DECSM, DEC set mode
+       CSI j            = HPB
+       CSI k            = VPB
+123x   CSI l            = RM, Reset mode
+123x   CSI ? l          = DECRM, DEC reset mode
+123x   CSI m            = SGR, Set Graphic Rendition
+       CSI ? m          = DECSGR, private Set Graphic Rendition
+123x   CSI   n          = DSR, Device Status Report
+ 23x       5            =   operating status
+ 23x       6            =   CPR = cursor position
+ 23x   CSI ? n          = DECDSR; behaves as DSR but uses CSI ? instead of CSI to respond
+ 23x   CSI ! p          = DECSTR, soft terminal reset
+  3x   CSI ? $ p        = DECRQM, request private mode
+   x   CSI   Sp q       = DECSCUSR (odd numbers blink, even numbers solid)
+           1 or 2       =   block
+           3 or 4       =   underline
+           5 or 6       =   I-beam to left
+   x   CSI > q          = XTVERSION, request version string
+ 23x   CSI " q          = DECSCA, select character attributes
+123x   CSI r            = DECSTBM
+   x   CSI s            = DECSLRM
+   x   CSI ' }          = DECIC
+   x   CSI ' ~          = DECDC
+
+    OSCs
+
+   x   OSC 0;           = Set icon name and title
+   x   OSC 1;           = Set icon name
+   x   OSC 2;           = Set title
+   x   OSC 52;          = Selection management
+
+    Standard modes
+
+ 23x   SM 4             = IRM
+123x   SM 20            = NLM, linefeed/newline
+
+    DEC modes
+
+123x   DECSM 1          = DECCKM, cursor keys
+123x   DECSM 5          = DECSCNM, screen
+123x   DECSM 6          = DECOM, origin
+123x   DECSM 7          = DECAWM, autowrap
+   x   DECSM 12         = Cursor blink
+ 23x   DECSM 25         = DECTCEM, text cursor enable
+   x   DECSM 69         = DECVSSM, vertical screen split
+   x   DECSM 1000       = Mouse click/release tracking
+   x   DECSM 1002       = Mouse click/release/drag tracking
+   x   DECSM 1003       = Mouse all movements tracking
+   x   DECSM 1004       = Focus in/out reporting
+   x   DECSM 1005       = Mouse protocol extended (UTF-8) - not recommended
+   x   DECSM 1006       = Mouse protocol SGR
+   x   DECSM 1015       = Mouse protocol rxvt
+   x   DECSM 1047       = Altscreen
+   x   DECSM 1048       = Save cursor
+   x   DECSM 1049       = 1047 + 1048
+   x   DECSM 2004       = Bracketed paste
+
+    Graphic Renditions
+
+123x   SGR 0            = Reset
+123x   SGR 1            = Bold on
+   x   SGR 3            = Italic on
+123x   SGR 4            = Underline single
+       SGR 4:x          = Underline style
+123x   SGR 5            = Blink on
+123x   SGR 7            = Reverse on
+   x   SGR 8            = Conceal on
+   x   SGR 9            = Strikethrough on
+       SGR 10-19        = Select font
+   x   SGR 21           = Underline double
+ 23x   SGR 22           = Bold off
+   x   SGR 23           = Italic off
+ 23x   SGR 24           = Underline off
+ 23x   SGR 25           = Blink off
+ 23x   SGR 27           = Reverse off
+   x   SGR 28           = Conceal off
+   x   SGR 29           = Strikethrough off
+   x   SGR 30-37        = Foreground ANSI
+   x   SGR 38           = Foreground alternative palette
+   x   SGR 39           = Foreground default
+   x   SGR 40-47        = Background ANSI
+   x   SGR 48           = Background alternative palette
+   x   SGR 49           = Background default
+       SGR 73           = Superscript on
+       SGR 74           = Subscript on
+       SGR 75           = Superscript/subscript off
+   x   SGR 90-97        = Foreground ANSI high-intensity
+   x   SGR 100-107      = Background ANSI high-intensity
+
+The state storage used by ESC 7 and DECSM 1048/1049 is shared.
+
+    Unimplemented sequences:
+
+The following sequences are not recognised by libvterm.
+
+123x   0x05             = ENQ
+  3    0x11             = DC1 (XON)
+  3    0x13             = DC3 (XOFF)
+   x   ESC % @          = Select default character set
+   x   ESC % G          = Select UTF-8 character set
+   x   ESC 6            = DECBI, Back Index
+12     ESC Z            = DECID, identify terminal
+   x   DCS + Q          = XTGETXRES, Request resource values
+       DCS $ q          = [DECRQSS]
+  3x           " p      =   Request DECSCL
+   x           t        =   Request DECSLPP
+   x           $ |      =   Request DECSCPP
+   x           * |      =   Request DECSLNS
+  3            $ }      =   Request DECSASD
+  3            $ ~      =   Request DECSSDT
+   x   DCS + p          = XTSETTCAP, set termcap/terminfo data
+   x   DCS + q          = XTGETTCAP, request termcap/terminfo
+ 23    DCS {            = DECDLD, down-line-loadable character set
+ 23x   DCS |            = DECUDK, user-defined key
+   x   CSI Sp @         = Shift left columns
+   x   CSI Sp A         = Shift right columns
+   x   CSI # P          = XTPUSHCOLORS, push current dynamic colours to stack
+   x   CSI # Q          = XTPOPCOLORS, pop dynamic colours from stack
+   x   CSI # R          = XTREPORTCOLORS, report current entry on palette stack
+   x   CSI ? S          = XTSMGRAPHICS, set/request graphics attribute
+   x   CSI > T          = XTRMTITLE, reset title mode features
+ 23x   CSI i            = DEC printer control
+   x   CSI > m          = XTMODKEYS, set key modifier options
+   x   CSI > n          = (XTMODKEYS), reset key modifier options
+   x   CSI $ p          = DECRQM, request ANSI mode
+ 23x   CSI " p          = DECSCL, set compatibility level
+   x   CSI > p          = XTSMPOINTER, set resource value pointer mode
+1  x   CSI q            = DECLL, load LEDs
+   x   CSI ? r          = XTRESTORE, restore DEC private mode values
+   x   CSI $ r          = DECCARA, change attributes in rectangular area
+   x   CSI > s          = XTSHIFTESCAPE, set/reset shift-escape options
+   x   CSI ? s          = XTSAVE, save DEC private mode values
+   x   CSI t            = XTWINOPS, window operations
+   x   CSI > t          = XTSMTITLE, set title mode features
+   x   CSI $ t          = DECRARA, reset attributes in rectangular area
+  3    CSI   $ u        = DECRQTSR, request terminal state report
+  3        1            =   terminal state report
+  3    CSI & u          = DECRQUPSS, request user-preferred supplemental set
+   x   CSI $ v          = DECCRA, copy rectangular area
+  3x   CSI   $ w        = DECRQPSR, request presentation state report
+  3x       1            =   cursor information report
+  3x       2            =   tab stop report
+   x   CSI ' w          = DECEFR, enable filter rectangle
+1  x   CSI x            = DECREQTPARM, request terminal parameters
+   x   CSI * x          = DECSACE, select attribute change extent
+   x   CSI $ x          = DECFRA, fill rectangular area
+123    CSI y            = DECTST, invoke confidence test
+   x   CSI $ z          = DECERA, erase rectangular area
+   x   CSI # {          = XTPUSHSGR, push video attributes onto stack
+   x   CSI $ {          = DECSERA, selective erase in rectangular area
+   x   CSI # |          = XTREPORTSGR, report selected graphic rendition
+   x   CSI $ |          = DECSCPP, select columns per page
+   x   CSI # }          = XTPOPSGR, pop video attributes from stack
+  3    CSI $ }          = DECSASD, select active status display
+  3    CSI $ ~          = DECSSDT, select status line type
+ 23    SM 2             = KAM, keyboard action
+123    SM 12            = SRM, send/receive
+123    DECSM 2          = DECANM, ANSI/VT52
+123    DECSM 3          = DECCOLM, 132 column
+123    DECSM 4          = DECSCLM, scrolling
+123    DECSM 8          = DECARM, auto-repeat
+12     DECSM 9          = DECINLM, interlace
+ 23    DECSM 18         = DECPFF, print form feed
+ 23    DECSM 19         = DECPEX, print extent
+ 23    DECSM 42         = DECNRCM, national/multinational character
diff --git a/src/libvterm/find-wide-chars.pl b/src/libvterm/find-wide-chars.pl
new file mode 100644
index 0000000..f7f2205
--- /dev/null
+++ b/src/libvterm/find-wide-chars.pl
@@ -0,0 +1,30 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+STDOUT->autoflush(1);
+
+sub iswide
+{
+   my ( $cp ) = @_;
+   return chr($cp) =~ m/\p{East_Asian_Width=Wide}|\p{East_Asian_Width=Fullwidth}/;
+}
+
+my ( $start, $end );
+foreach my $cp ( 0 .. 0x1FFFF ) {
+   iswide($cp) or next;
+
+   if( defined $end and $end == $cp-1 ) {
+      # extend the range
+      $end = $cp;
+      next;
+   }
+
+   # start a new range
+   printf "  { %#04x, %#04x },\n", $start, $end if defined $start;
+
+   $start = $end = $cp;
+}
+
+printf "  { %#04x, %#04x },\n", $start, $end if defined $start;
diff --git a/src/libvterm/include/vterm.h b/src/libvterm/include/vterm.h
new file mode 100644
index 0000000..6a967db
--- /dev/null
+++ b/src/libvterm/include/vterm.h
@@ -0,0 +1,671 @@
+/*
+ * NOTE: This is a MODIFIED version of libvterm, see the README file.
+ */
+#ifndef __VTERM_H__
+#define __VTERM_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdlib.h>
+
+#include "vterm_keycodes.h"
+
+// VIM: use TRUE and FALSE instead of true and false
+#define TRUE 1
+#define FALSE 0
+
+// VIM: from stdint.h
+typedef unsigned char		uint8_t;
+typedef unsigned short		uint16_t;
+typedef unsigned int		uint32_t;
+
+#define VTERM_VERSION_MAJOR 0
+#define VTERM_VERSION_MINOR 3
+
+#define VTERM_CHECK_VERSION \
+        vterm_check_version(VTERM_VERSION_MAJOR, VTERM_VERSION_MINOR)
+
+/* Any cell can contain at most one basic printing character and 5 combining
+ * characters. This number could be changed but will be ABI-incompatible if
+ * you do */
+#define VTERM_MAX_CHARS_PER_CELL 6
+
+typedef struct VTerm VTerm;
+typedef struct VTermState VTermState;
+typedef struct VTermScreen VTermScreen;
+
+// Specifies a screen point.
+typedef struct {
+  int row;
+  int col;
+} VTermPos;
+
+/* some small utility functions; we can just keep these static here */
+
+/*
+ * Order points by on-screen flow order:
+ * Return < 0 if "a" is before "b"
+ * Return  0  if "a" and "b" are equal
+ * Return > 0 if "a" is after "b".
+ */
+int vterm_pos_cmp(VTermPos a, VTermPos b);
+
+#if defined(DEFINE_INLINES) || USE_INLINE
+INLINE int vterm_pos_cmp(VTermPos a, VTermPos b)
+{
+  return (a.row == b.row) ? a.col - b.col : a.row - b.row;
+}
+#endif
+
+// Specifies a rectangular screen area.
+typedef struct {
+  int start_row;
+  int end_row;
+  int start_col;
+  int end_col;
+} VTermRect;
+
+/* true if the rect contains the point */
+int vterm_rect_contains(VTermRect r, VTermPos p);
+
+#if defined(DEFINE_INLINES) || USE_INLINE
+INLINE int vterm_rect_contains(VTermRect r, VTermPos p)
+{
+  return p.row >= r.start_row && p.row < r.end_row &&
+         p.col >= r.start_col && p.col < r.end_col;
+}
+#endif
+
+/* move a rect */
+// Move "rect" "row_delta" down and "col_delta" right.
+// Does not check boundaries.
+void vterm_rect_move(VTermRect *rect, int row_delta, int col_delta);
+
+#if defined(DEFINE_INLINES) || USE_INLINE
+INLINE void vterm_rect_move(VTermRect *rect, int row_delta, int col_delta)
+{
+  rect->start_row += row_delta; rect->end_row += row_delta;
+  rect->start_col += col_delta; rect->end_col += col_delta;
+}
+#endif
+
+/**
+ * Bit-field describing the value of VTermColor.type
+ */
+typedef enum {
+  /**
+   * If the lower bit of `type` is not set, the colour is 24-bit RGB.
+   */
+  VTERM_COLOR_RGB = 0x00,
+
+  /**
+   * The colour is an index into a palette of 256 colours.
+   */
+  VTERM_COLOR_INDEXED = 0x01,
+
+  /**
+   * Mask that can be used to extract the RGB/Indexed bit.
+   */
+  VTERM_COLOR_TYPE_MASK = 0x01,
+
+  /**
+   * If set, indicates that this colour should be the default foreground
+   * color, i.e. there was no SGR request for another colour. When
+   * rendering this colour it is possible to ignore "idx" and just use a
+   * colour that is not in the palette.
+   */
+  VTERM_COLOR_DEFAULT_FG = 0x02,
+
+  /**
+   * If set, indicates that this colour should be the default background
+   * color, i.e. there was no SGR request for another colour. A common
+   * option when rendering this colour is to not render a background at
+   * all, for example by rendering the window transparently at this spot.
+   */
+  VTERM_COLOR_DEFAULT_BG = 0x04,
+
+  /**
+   * Mask that can be used to extract the default foreground/background bit.
+   */
+  VTERM_COLOR_DEFAULT_MASK = 0x06,
+
+  /**
+   * VIM: If set, indicates that the color is invalid.
+   */
+  VTERM_COLOR_INVALID = 0x08
+} VTermColorType;
+
+/**
+ * Returns true if the VTERM_COLOR_RGB `type` flag is set, indicating that the
+ * given VTermColor instance is an indexed colour.
+ */
+#define VTERM_COLOR_IS_INDEXED(col) \
+  (((col)->type & VTERM_COLOR_TYPE_MASK) == VTERM_COLOR_INDEXED)
+
+/**
+ * Returns true if the VTERM_COLOR_INDEXED `type` flag is set, indicating that
+ * the given VTermColor instance is an rgb colour.
+ */
+#define VTERM_COLOR_IS_RGB(col) \
+  (((col)->type & VTERM_COLOR_TYPE_MASK) == VTERM_COLOR_RGB)
+
+/**
+ * Returns true if the VTERM_COLOR_DEFAULT_FG `type` flag is set, indicating
+ * that the given VTermColor instance corresponds to the default foreground
+ * color.
+ */
+#define VTERM_COLOR_IS_DEFAULT_FG(col) \
+  (!!((col)->type & VTERM_COLOR_DEFAULT_FG))
+
+/**
+ * Returns true if the VTERM_COLOR_DEFAULT_BG `type` flag is set, indicating
+ * that the given VTermColor instance corresponds to the default background
+ * color.
+ */
+#define VTERM_COLOR_IS_DEFAULT_BG(col) \
+  (!!((col)->type & VTERM_COLOR_DEFAULT_BG))
+
+/**
+ * Returns true if the VTERM_COLOR_INVALID `type` flag is set, indicating
+ * that the given VTermColor instance is an invalid color.
+ */
+#define VTERM_COLOR_IS_INVALID(col) (!!((col)->type & VTERM_COLOR_INVALID))
+
+// VIM: this was a union, but that doesn't always work.
+typedef struct {
+  /**
+   * Tag indicating which member is actually valid.
+   * Please use the `VTERM_COLOR_IS_*` test macros to check whether a
+   * particular type flag is set.
+   */
+  uint8_t type;
+
+  uint8_t red, green, blue;
+
+  uint8_t index;
+} VTermColor;
+
+/**
+ * Constructs a new VTermColor instance representing the given RGB values.
+ */
+void vterm_color_rgb(VTermColor *col, uint8_t red, uint8_t green, uint8_t blue);
+
+/**
+ * Construct a new VTermColor instance representing an indexed color with the
+ * given index.
+ */
+void vterm_color_indexed(VTermColor *col, uint8_t idx);
+
+/**
+ * Compares two colours. Returns true if the colors are equal, false otherwise.
+ */
+int vterm_color_is_equal(const VTermColor *a, const VTermColor *b);
+
+typedef enum {
+  /* VTERM_VALUETYPE_NONE = 0 */
+  VTERM_VALUETYPE_BOOL = 1,
+  VTERM_VALUETYPE_INT,
+  VTERM_VALUETYPE_STRING,
+  VTERM_VALUETYPE_COLOR,
+
+  VTERM_N_VALUETYPES
+} VTermValueType;
+
+typedef struct {
+  const char *str;
+  size_t      len : 30;
+  unsigned int  initial : 1;
+  unsigned int  final : 1;
+} VTermStringFragment;
+
+typedef union {
+  int boolean;
+  int number;
+  VTermStringFragment string;
+  VTermColor color;
+} VTermValue;
+
+typedef enum {
+  /* VTERM_ATTR_NONE = 0 */
+  VTERM_ATTR_BOLD = 1,   // bool:   1, 22
+  VTERM_ATTR_UNDERLINE,  // number: 4, 21, 24
+  VTERM_ATTR_ITALIC,     // bool:   3, 23
+  VTERM_ATTR_BLINK,      // bool:   5, 25
+  VTERM_ATTR_REVERSE,    // bool:   7, 27
+  VTERM_ATTR_CONCEAL,    // bool:   8, 28
+  VTERM_ATTR_STRIKE,     // bool:   9, 29
+  VTERM_ATTR_FONT,       // number: 10-19
+  VTERM_ATTR_FOREGROUND, // color:  30-39 90-97
+  VTERM_ATTR_BACKGROUND, // color:  40-49 100-107
+  VTERM_ATTR_SMALL,      // bool:   73, 74, 75
+  VTERM_ATTR_BASELINE,   // number: 73, 74, 75
+
+  VTERM_N_ATTRS
+} VTermAttr;
+
+typedef enum {
+  /* VTERM_PROP_NONE = 0 */
+  VTERM_PROP_CURSORVISIBLE = 1, // bool
+  VTERM_PROP_CURSORBLINK,       // bool
+  VTERM_PROP_ALTSCREEN,         // bool
+  VTERM_PROP_TITLE,             // string
+  VTERM_PROP_ICONNAME,          // string
+  VTERM_PROP_REVERSE,           // bool
+  VTERM_PROP_CURSORSHAPE,       // number
+  VTERM_PROP_MOUSE,             // number
+  VTERM_PROP_CURSORCOLOR,       // VIM - string
+
+  VTERM_N_PROPS
+} VTermProp;
+
+enum {
+  VTERM_PROP_CURSORSHAPE_BLOCK = 1,
+  VTERM_PROP_CURSORSHAPE_UNDERLINE,
+  VTERM_PROP_CURSORSHAPE_BAR_LEFT,
+
+  VTERM_N_PROP_CURSORSHAPES
+};
+
+enum {
+  VTERM_PROP_MOUSE_NONE = 0,
+  VTERM_PROP_MOUSE_CLICK,
+  VTERM_PROP_MOUSE_DRAG,
+  VTERM_PROP_MOUSE_MOVE,
+
+  VTERM_N_PROP_MOUSES
+};
+
+typedef enum {
+  VTERM_SELECTION_CLIPBOARD = (1<<0),
+  VTERM_SELECTION_PRIMARY   = (1<<1),
+  VTERM_SELECTION_SECONDARY = (1<<2),
+  VTERM_SELECTION_SELECT    = (1<<3),
+  VTERM_SELECTION_CUT0      = (1<<4), /* also CUT1 .. CUT7 by bitshifting */
+} VTermSelectionMask;
+
+typedef struct {
+  const uint32_t *chars;
+  int             width;
+  unsigned int    protected_cell:1;  /* DECSCA-protected against DECSEL/DECSED */
+  unsigned int    dwl:1;             /* DECDWL or DECDHL double-width line */
+  unsigned int    dhl:2;             /* DECDHL double-height line (1=top 2=bottom) */
+} VTermGlyphInfo;
+
+typedef struct {
+  unsigned int    doublewidth:1;     /* DECDWL or DECDHL line */
+  unsigned int    doubleheight:2;    /* DECDHL line (1=top 2=bottom) */
+  unsigned int    continuation:1;    /* Line is a flow continuation of the previous */
+} VTermLineInfo;
+
+/* Copies of VTermState fields that the 'resize' callback might have reason to
+ * edit. 'resize' callback gets total control of these fields and may
+ * free-and-reallocate them if required. They will be copied back from the
+ * struct after the callback has returned.
+ */
+typedef struct {
+  VTermPos pos;                /* current cursor position */
+  VTermLineInfo *lineinfos[2]; /* [1] may be NULL */
+} VTermStateFields;
+
+typedef struct {
+  /* libvterm relies on this memory to be zeroed out before it is returned
+   * by the allocator. */
+  void *(*malloc)(size_t size, void *allocdata);
+  void  (*free)(void *ptr, void *allocdata);
+} VTermAllocatorFunctions;
+
+void vterm_check_version(int major, int minor);
+
+struct VTermBuilder {
+  int ver; /* currently unused but reserved for some sort of ABI version flag */
+
+  int rows, cols;
+
+  const VTermAllocatorFunctions *allocator;
+  void *allocdata;
+
+  /* Override default sizes for various structures */
+  size_t outbuffer_len;  /* default: 4096 */
+  size_t tmpbuffer_len;  /* default: 4096 */
+};
+
+VTerm *vterm_build(const struct VTermBuilder *builder);
+
+/* A convenient shortcut for default cases */
+// Allocate and initialize a new terminal with default allocators.
+VTerm *vterm_new(int rows, int cols);
+/* These shortcuts are generally discouraged in favour of just using vterm_build() */
+
+// Allocate and initialize a new terminal with specified allocators.
+VTerm *vterm_new_with_allocator(int rows, int cols, VTermAllocatorFunctions *funcs, void *allocdata);
+
+// Free and cleanup a terminal and all its data.
+void   vterm_free(VTerm* vt);
+
+// Get the current size of the terminal and store in "rowsp" and "colsp".
+void vterm_get_size(const VTerm *vt, int *rowsp, int *colsp);
+
+void vterm_set_size(VTerm *vt, int rows, int cols);
+
+int  vterm_get_utf8(const VTerm *vt);
+void vterm_set_utf8(VTerm *vt, int is_utf8);
+
+size_t vterm_input_write(VTerm *vt, const char *bytes, size_t len);
+
+/* Setting output callback will override the buffer logic */
+typedef void VTermOutputCallback(const char *s, size_t len, void *user);
+void vterm_output_set_callback(VTerm *vt, VTermOutputCallback *func, void *user);
+
+/* These buffer functions only work if output callback is NOT set
+ * These are deprecated and will be removed in a later version */
+size_t vterm_output_get_buffer_size(const VTerm *vt);
+size_t vterm_output_get_buffer_current(const VTerm *vt);
+size_t vterm_output_get_buffer_remaining(const VTerm *vt);
+
+/* This too */
+size_t vterm_output_read(VTerm *vt, char *buffer, size_t len);
+
+int vterm_is_modify_other_keys(VTerm *vt);
+int vterm_is_kitty_keyboard(VTerm *vt);
+void vterm_keyboard_unichar(VTerm *vt, uint32_t c, VTermModifier mod);
+void vterm_keyboard_key(VTerm *vt, VTermKey key, VTermModifier mod);
+
+void vterm_keyboard_start_paste(VTerm *vt);
+void vterm_keyboard_end_paste(VTerm *vt);
+
+void vterm_mouse_move(VTerm *vt, int row, int col, VTermModifier mod);
+// "button" is 1 for left, 2 for middle, 3 for right.
+// Button 4 is scroll wheel down, button 5 is scroll wheel up.
+void vterm_mouse_button(VTerm *vt, int button, int pressed, VTermModifier mod);
+
+// ------------
+// Parser layer
+// ------------
+
+/* Flag to indicate non-final subparameters in a single CSI parameter.
+ * Consider
+ *   CSI 1;2:3:4;5a
+ * 1 4 and 5 are final.
+ * 2 and 3 are non-final and will have this bit set
+ *
+ * Don't confuse this with the final byte of the CSI escape; 'a' in this case.
+ */
+#define CSI_ARG_FLAG_MORE (1U<<31)
+#define CSI_ARG_MASK      (~(1U<<31))
+
+#define CSI_ARG_HAS_MORE(a) ((a) & CSI_ARG_FLAG_MORE)
+#define CSI_ARG(a)          ((a) & CSI_ARG_MASK)
+
+/* Can't use -1 to indicate a missing argument; use this instead */
+// VIM: changed 31 to 30 to avoid an overflow warning
+#define CSI_ARG_MISSING ((1<<30)-1)
+
+#define CSI_ARG_IS_MISSING(a) (CSI_ARG(a) == CSI_ARG_MISSING)
+#define CSI_ARG_OR(a,def)     (CSI_ARG(a) == CSI_ARG_MISSING ? (def) : CSI_ARG(a))
+#define CSI_ARG_COUNT(a)      (CSI_ARG(a) == CSI_ARG_MISSING || CSI_ARG(a) == 0 ? 1 : CSI_ARG(a))
+
+typedef struct {
+  int (*text)(const char *bytes, size_t len, void *user);
+  int (*control)(unsigned char control, void *user);
+  int (*escape)(const char *bytes, size_t len, void *user);
+  int (*csi)(const char *leader, const long args[], int argcount, const char *intermed, char command, void *user);
+  int (*osc)(int command, VTermStringFragment frag, void *user);
+  int (*dcs)(const char *command, size_t commandlen, VTermStringFragment frag, void *user);
+  int (*apc)(VTermStringFragment frag, void *user);
+  int (*pm)(VTermStringFragment frag, void *user);
+  int (*sos)(VTermStringFragment frag, void *user);
+  int (*resize)(int rows, int cols, void *user);
+} VTermParserCallbacks;
+
+void  vterm_parser_set_callbacks(VTerm *vt, const VTermParserCallbacks *callbacks, void *user);
+void *vterm_parser_get_cbdata(VTerm *vt);
+
+// -----------
+// State layer
+// -----------
+
+typedef struct {
+  int (*putglyph)(VTermGlyphInfo *info, VTermPos pos, void *user);
+  int (*movecursor)(VTermPos pos, VTermPos oldpos, int visible, void *user);
+  int (*scrollrect)(VTermRect rect, int downward, int rightward, void *user);
+  int (*moverect)(VTermRect dest, VTermRect src, void *user);
+  int (*erase)(VTermRect rect, int selective, void *user);
+  int (*initpen)(void *user);
+  int (*setpenattr)(VTermAttr attr, VTermValue *val, void *user);
+  // Callback for setting various properties.  Must return 1 if the property
+  // was accepted, 0 otherwise.
+  int (*settermprop)(VTermProp prop, VTermValue *val, void *user);
+  int (*bell)(void *user);
+  int (*resize)(int rows, int cols, VTermStateFields *fields, void *user);
+  int (*setlineinfo)(int row, const VTermLineInfo *newinfo, const VTermLineInfo *oldinfo, void *user);
+  int (*sb_clear)(void *user);
+} VTermStateCallbacks;
+
+// VIM: added
+typedef struct {
+  VTermPos pos;
+  int	   buttons;
+#define MOUSE_BUTTON_LEFT 0x01
+#define MOUSE_BUTTON_MIDDLE 0x02
+#define MOUSE_BUTTON_RIGHT 0x04
+  int      flags;
+#define MOUSE_WANT_CLICK 0x01
+#define MOUSE_WANT_DRAG  0x02
+#define MOUSE_WANT_MOVE  0x04
+  // useful to add protocol?
+} VTermMouseState;
+
+typedef struct {
+  int (*control)(unsigned char control, void *user);
+  int (*csi)(const char *leader, const long args[], int argcount, const char *intermed, char command, void *user);
+  int (*osc)(int command, VTermStringFragment frag, void *user);
+  int (*dcs)(const char *command, size_t commandlen, VTermStringFragment frag, void *user);
+  int (*apc)(VTermStringFragment frag, void *user);
+  int (*pm)(VTermStringFragment frag, void *user);
+  int (*sos)(VTermStringFragment frag, void *user);
+} VTermStateFallbacks;
+
+typedef struct {
+  int (*set)(VTermSelectionMask mask, VTermStringFragment frag, void *user);
+  int (*query)(VTermSelectionMask mask, void *user);
+} VTermSelectionCallbacks;
+
+VTermState *vterm_obtain_state(VTerm *vt);
+
+void  vterm_state_set_callbacks(VTermState *state, const VTermStateCallbacks *callbacks, void *user);
+void *vterm_state_get_cbdata(VTermState *state);
+
+void  vterm_state_set_unrecognised_fallbacks(VTermState *state, const VTermStateFallbacks *fallbacks, void *user);
+void *vterm_state_get_unrecognised_fbdata(VTermState *state);
+
+// Initialize the state.
+void vterm_state_reset(VTermState *state, int hard);
+
+void vterm_state_get_cursorpos(const VTermState *state, VTermPos *cursorpos);
+// VIM: added
+void vterm_state_get_mousestate(const VTermState *state, VTermMouseState *mousestate);
+void vterm_state_get_default_colors(const VTermState *state, VTermColor *default_fg, VTermColor *default_bg);
+void vterm_state_get_palette_color(const VTermState *state, int index, VTermColor *col);
+void vterm_state_set_default_colors(VTermState *state, const VTermColor *default_fg, const VTermColor *default_bg);
+void vterm_state_set_palette_color(VTermState *state, int index, const VTermColor *col);
+void vterm_state_set_bold_highbright(VTermState *state, int bold_is_highbright);
+int  vterm_state_get_penattr(const VTermState *state, VTermAttr attr, VTermValue *val);
+int  vterm_state_set_termprop(VTermState *state, VTermProp prop, VTermValue *val);
+void vterm_state_focus_in(VTermState *state);
+void vterm_state_focus_out(VTermState *state);
+const VTermLineInfo *vterm_state_get_lineinfo(const VTermState *state, int row);
+
+/**
+ * Makes sure that the given color `col` is indeed an RGB colour. After this
+ * function returns, VTERM_COLOR_IS_RGB(col) will return true, while all other
+ * flags stored in `col->type` will have been reset.
+ *
+ * @param state is the VTermState instance from which the colour palette should
+ * be extracted.
+ * @param col is a pointer at the VTermColor instance that should be converted
+ * to an RGB colour.
+ */
+void vterm_state_convert_color_to_rgb(const VTermState *state, VTermColor *col);
+
+void vterm_state_set_selection_callbacks(VTermState *state, const VTermSelectionCallbacks *callbacks, void *user,
+    char *buffer, size_t buflen);
+
+void vterm_state_send_selection(VTermState *state, VTermSelectionMask mask, VTermStringFragment frag);
+
+// ------------
+// Screen layer
+// ------------
+
+typedef struct {
+    unsigned int bold      : 1;
+    unsigned int underline : 2;
+    unsigned int italic    : 1;
+    unsigned int blink     : 1;
+    unsigned int reverse   : 1;
+    unsigned int conceal   : 1;
+    unsigned int strike    : 1;
+    unsigned int font      : 4; /* 0 to 9 */
+    unsigned int dwl       : 1; /* On a DECDWL or DECDHL line */
+    unsigned int dhl       : 2; /* On a DECDHL line (1=top 2=bottom) */
+    unsigned int small     : 1;
+    unsigned int baseline  : 2;
+} VTermScreenCellAttrs;
+
+enum {
+  VTERM_UNDERLINE_OFF,
+  VTERM_UNDERLINE_SINGLE,
+  VTERM_UNDERLINE_DOUBLE,
+  VTERM_UNDERLINE_CURLY,
+};
+
+enum {
+  VTERM_BASELINE_NORMAL,
+  VTERM_BASELINE_RAISE,
+  VTERM_BASELINE_LOWER,
+};
+
+typedef struct {
+  uint32_t chars[VTERM_MAX_CHARS_PER_CELL];
+  char     width;
+  VTermScreenCellAttrs attrs;
+  VTermColor fg, bg;
+} VTermScreenCell;
+
+// All fields are optional, NULL when not used.
+typedef struct {
+  int (*damage)(VTermRect rect, void *user);
+  int (*moverect)(VTermRect dest, VTermRect src, void *user);
+  int (*movecursor)(VTermPos pos, VTermPos oldpos, int visible, void *user);
+  int (*settermprop)(VTermProp prop, VTermValue *val, void *user);
+  int (*bell)(void *user);
+  int (*resize)(int rows, int cols, void *user);
+  // A line was pushed off the top of the window.
+  // "cells[cols]" contains the cells of that line.
+  // Return value is unused.
+  int (*sb_pushline)(int cols, const VTermScreenCell *cells, void *user);
+  int (*sb_popline)(int cols, VTermScreenCell *cells, void *user);
+  int (*sb_clear)(void* user);
+} VTermScreenCallbacks;
+
+// Return the screen of the vterm.
+VTermScreen *vterm_obtain_screen(VTerm *vt);
+
+/*
+ * Install screen callbacks.  These are invoked when the screen contents is
+ * changed.  "user" is passed into to the callback.
+ */
+void  vterm_screen_set_callbacks(VTermScreen *screen, const VTermScreenCallbacks *callbacks, void *user);
+void *vterm_screen_get_cbdata(VTermScreen *screen);
+
+void  vterm_screen_set_unrecognised_fallbacks(VTermScreen *screen, const VTermStateFallbacks *fallbacks, void *user);
+void *vterm_screen_get_unrecognised_fbdata(VTermScreen *screen);
+
+void vterm_screen_enable_reflow(VTermScreen *screen, int reflow);
+
+// Back-compat alias for the brief time it was in 0.3-RC1
+#define vterm_screen_set_reflow  vterm_screen_enable_reflow
+
+// Enable support for using the alternate screen if "altscreen" is non-zero.
+// Before that switching to the alternate screen won't work.
+// Calling with "altscreen" zero has no effect.
+void vterm_screen_enable_altscreen(VTermScreen *screen, int altscreen);
+
+typedef enum {
+  VTERM_DAMAGE_CELL,    /* every cell */
+  VTERM_DAMAGE_ROW,     /* entire rows */
+  VTERM_DAMAGE_SCREEN,  /* entire screen */
+  VTERM_DAMAGE_SCROLL,  /* entire screen + scrollrect */
+
+  VTERM_N_DAMAGES
+} VTermDamageSize;
+
+// Invoke the relevant callbacks to update the screen.
+void vterm_screen_flush_damage(VTermScreen *screen);
+
+void vterm_screen_set_damage_merge(VTermScreen *screen, VTermDamageSize size);
+
+/*
+ * Reset the screen.  Also invokes vterm_state_reset().
+ * Must be called before the terminal can be used.
+ */
+void   vterm_screen_reset(VTermScreen *screen, int hard);
+
+/* Neither of these functions NUL-terminate the buffer */
+size_t vterm_screen_get_chars(const VTermScreen *screen, uint32_t *chars, size_t len, const VTermRect rect);
+size_t vterm_screen_get_text(const VTermScreen *screen, char *str, size_t len, const VTermRect rect);
+
+typedef enum {
+  VTERM_ATTR_BOLD_MASK       = 1 << 0,
+  VTERM_ATTR_UNDERLINE_MASK  = 1 << 1,
+  VTERM_ATTR_ITALIC_MASK     = 1 << 2,
+  VTERM_ATTR_BLINK_MASK      = 1 << 3,
+  VTERM_ATTR_REVERSE_MASK    = 1 << 4,
+  VTERM_ATTR_STRIKE_MASK     = 1 << 5,
+  VTERM_ATTR_FONT_MASK       = 1 << 6,
+  VTERM_ATTR_FOREGROUND_MASK = 1 << 7,
+  VTERM_ATTR_BACKGROUND_MASK = 1 << 8,
+  VTERM_ATTR_CONCEAL_MASK    = 1 << 9,
+  VTERM_ATTR_SMALL_MASK      = 1 << 10,
+  VTERM_ATTR_BASELINE_MASK   = 1 << 11,
+
+  VTERM_ALL_ATTRS_MASK = (1 << 12) - 1
+} VTermAttrMask;
+
+int vterm_screen_get_attrs_extent(const VTermScreen *screen, VTermRect *extent, VTermPos pos, VTermAttrMask attrs);
+
+int vterm_screen_get_cell(const VTermScreen *screen, VTermPos pos, VTermScreenCell *cell);
+
+int vterm_screen_is_eol(const VTermScreen *screen, VTermPos pos);
+
+/**
+ * Same as vterm_state_convert_color_to_rgb(), but takes a `screen` instead of a `state`
+ * instance.
+ */
+void vterm_screen_convert_color_to_rgb(const VTermScreen *screen, VTermColor *col);
+
+// ---------
+// Utilities
+// ---------
+
+VTermValueType vterm_get_attr_type(VTermAttr attr);
+VTermValueType vterm_get_prop_type(VTermProp prop);
+
+void vterm_scroll_rect(VTermRect rect,
+                       int downward,
+                       int rightward,
+                       int (*moverect)(VTermRect src, VTermRect dest, void *user),
+                       int (*eraserect)(VTermRect rect, int selective, void *user),
+                       void *user);
+
+void vterm_copy_cells(VTermRect dest,
+                      VTermRect src,
+                      void (*copycell)(VTermPos dest, VTermPos src, void *user),
+                      void *user);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/src/libvterm/include/vterm_keycodes.h b/src/libvterm/include/vterm_keycodes.h
new file mode 100644
index 0000000..e5fb5ab
--- /dev/null
+++ b/src/libvterm/include/vterm_keycodes.h
@@ -0,0 +1,64 @@
+#ifndef __VTERM_INPUT_H__
+#define __VTERM_INPUT_H__
+
+typedef enum {
+  VTERM_MOD_NONE  = 0x00,
+  VTERM_MOD_SHIFT = 0x01,
+  VTERM_MOD_ALT   = 0x02,
+  VTERM_MOD_CTRL  = 0x04,
+
+  VTERM_ALL_MODS_MASK = 0x07
+} VTermModifier;
+
+// The order here must match keycodes[] in src/keyboard.c!
+typedef enum {
+  VTERM_KEY_NONE,
+
+  VTERM_KEY_ENTER,
+  VTERM_KEY_TAB,
+  VTERM_KEY_BACKSPACE,
+  VTERM_KEY_ESCAPE,
+
+  VTERM_KEY_UP,
+  VTERM_KEY_DOWN,
+  VTERM_KEY_LEFT,
+  VTERM_KEY_RIGHT,
+
+  VTERM_KEY_INS,
+  VTERM_KEY_DEL,
+  VTERM_KEY_HOME,
+  VTERM_KEY_END,
+  VTERM_KEY_PAGEUP,
+  VTERM_KEY_PAGEDOWN,
+
+  // F1 is VTERM_KEY_FUNCTION(1), F2 VTERM_KEY_FUNCTION(2), etc.
+  VTERM_KEY_FUNCTION_0   = 256,
+  VTERM_KEY_FUNCTION_MAX = VTERM_KEY_FUNCTION_0 + 255,
+
+  // keypad keys
+  VTERM_KEY_KP_0,
+  VTERM_KEY_KP_1,
+  VTERM_KEY_KP_2,
+  VTERM_KEY_KP_3,
+  VTERM_KEY_KP_4,
+  VTERM_KEY_KP_5,
+  VTERM_KEY_KP_6,
+  VTERM_KEY_KP_7,
+  VTERM_KEY_KP_8,
+  VTERM_KEY_KP_9,
+  VTERM_KEY_KP_MULT,
+  VTERM_KEY_KP_PLUS,
+  VTERM_KEY_KP_COMMA,
+  VTERM_KEY_KP_MINUS,
+  VTERM_KEY_KP_PERIOD,
+  VTERM_KEY_KP_DIVIDE,
+  VTERM_KEY_KP_ENTER,
+  VTERM_KEY_KP_EQUAL,
+
+  VTERM_KEY_MAX, // Must be last
+  VTERM_N_KEYS = VTERM_KEY_MAX
+} VTermKey;
+
+#define VTERM_KEY_FUNCTION(n) (VTERM_KEY_FUNCTION_0+(n))
+
+#endif
diff --git a/src/libvterm/src/encoding.c b/src/libvterm/src/encoding.c
new file mode 100644
index 0000000..817344f
--- /dev/null
+++ b/src/libvterm/src/encoding.c
@@ -0,0 +1,234 @@
+#include "vterm_internal.h"
+
+#define UNICODE_INVALID 0xFFFD
+
+#if defined(DEBUG) && DEBUG > 1
+# define DEBUG_PRINT_UTF8
+#endif
+
+struct UTF8DecoderData {
+  // number of bytes remaining in this codepoint
+  int bytes_remaining;
+
+  // number of bytes total in this codepoint once it's finished
+  // (for detecting overlongs)
+  int bytes_total;
+
+  int this_cp;
+};
+
+static void init_utf8(VTermEncoding *enc UNUSED, void *data_)
+{
+  struct UTF8DecoderData *data = data_;
+
+  data->bytes_remaining = 0;
+  data->bytes_total     = 0;
+}
+
+static void decode_utf8(VTermEncoding *enc UNUSED, void *data_,
+                        uint32_t cp[], int *cpi, int cplen,
+                        const char bytes[], size_t *pos, size_t bytelen)
+{
+  struct UTF8DecoderData *data = data_;
+
+#ifdef DEBUG_PRINT_UTF8
+  printf("BEGIN UTF-8\n");
+#endif
+
+  for(; *pos < bytelen && *cpi < cplen; (*pos)++) {
+    unsigned char c = bytes[*pos];
+
+#ifdef DEBUG_PRINT_UTF8
+    printf(" pos=%zd c=%02x rem=%d\n", *pos, c, data->bytes_remaining);
+#endif
+
+    if(c < 0x20) // C0
+      return;
+
+    else if(c >= 0x20 && c < 0x7f) {
+      if(data->bytes_remaining) {
+        data->bytes_remaining = 0;
+        cp[(*cpi)++] = UNICODE_INVALID;
+	// VIM: avoid going over the end
+	if (*cpi >= cplen)
+	  break;
+      }
+      cp[(*cpi)++] = c;
+#ifdef DEBUG_PRINT_UTF8
+      printf(" UTF-8 char: U+%04x\n", c);
+#endif
+    }
+
+    else if(c == 0x7f) // DEL
+      return;
+
+    else if(c >= 0x80 && c < 0xc0) {
+      if(!data->bytes_remaining) {
+        cp[(*cpi)++] = UNICODE_INVALID;
+        continue;
+      }
+
+      data->this_cp <<= 6;
+      data->this_cp |= c & 0x3f;
+      data->bytes_remaining--;
+
+      if(!data->bytes_remaining) {
+#ifdef DEBUG_PRINT_UTF8
+        printf(" UTF-8 raw char U+%04x bytelen=%d ", data->this_cp, data->bytes_total);
+#endif
+        // Check for overlong sequences
+        switch(data->bytes_total) {
+        case 2:
+          if(data->this_cp <  0x0080) data->this_cp = UNICODE_INVALID;
+          break;
+        case 3:
+          if(data->this_cp <  0x0800) data->this_cp = UNICODE_INVALID;
+          break;
+        case 4:
+          if(data->this_cp < 0x10000) data->this_cp = UNICODE_INVALID;
+          break;
+        case 5:
+          if(data->this_cp < 0x200000) data->this_cp = UNICODE_INVALID;
+          break;
+        case 6:
+          if(data->this_cp < 0x4000000) data->this_cp = UNICODE_INVALID;
+          break;
+        }
+        // Now look for plain invalid ones
+        if((data->this_cp >= 0xD800 && data->this_cp <= 0xDFFF) ||
+           data->this_cp == 0xFFFE ||
+           data->this_cp == 0xFFFF)
+          data->this_cp = UNICODE_INVALID;
+#ifdef DEBUG_PRINT_UTF8
+        printf(" char: U+%04x\n", data->this_cp);
+#endif
+        cp[(*cpi)++] = data->this_cp;
+      }
+    }
+
+    else if(c >= 0xc0 && c < 0xe0) {
+      if(data->bytes_remaining)
+        cp[(*cpi)++] = UNICODE_INVALID;
+
+      data->this_cp = c & 0x1f;
+      data->bytes_total = 2;
+      data->bytes_remaining = 1;
+    }
+
+    else if(c >= 0xe0 && c < 0xf0) {
+      if(data->bytes_remaining)
+        cp[(*cpi)++] = UNICODE_INVALID;
+
+      data->this_cp = c & 0x0f;
+      data->bytes_total = 3;
+      data->bytes_remaining = 2;
+    }
+
+    else if(c >= 0xf0 && c < 0xf8) {
+      if(data->bytes_remaining)
+        cp[(*cpi)++] = UNICODE_INVALID;
+
+      data->this_cp = c & 0x07;
+      data->bytes_total = 4;
+      data->bytes_remaining = 3;
+    }
+
+    else if(c >= 0xf8 && c < 0xfc) {
+      if(data->bytes_remaining)
+        cp[(*cpi)++] = UNICODE_INVALID;
+
+      data->this_cp = c & 0x03;
+      data->bytes_total = 5;
+      data->bytes_remaining = 4;
+    }
+
+    else if(c >= 0xfc && c < 0xfe) {
+      if(data->bytes_remaining)
+        cp[(*cpi)++] = UNICODE_INVALID;
+
+      data->this_cp = c & 0x01;
+      data->bytes_total = 6;
+      data->bytes_remaining = 5;
+    }
+
+    else {
+      cp[(*cpi)++] = UNICODE_INVALID;
+    }
+  }
+}
+
+static VTermEncoding encoding_utf8 = {
+  &init_utf8,  // init
+  &decode_utf8 // decode
+};
+
+static void decode_usascii(VTermEncoding *enc UNUSED, void *data UNUSED,
+                           uint32_t cp[], int *cpi, int cplen,
+                           const char bytes[], size_t *pos, size_t bytelen)
+{
+  int is_gr = bytes[*pos] & 0x80;
+
+  for(; *pos < bytelen && *cpi < cplen; (*pos)++) {
+    unsigned char c = bytes[*pos] ^ is_gr;
+
+    if(c < 0x20 || c == 0x7f || c >= 0x80)
+      return;
+
+    cp[(*cpi)++] = c;
+  }
+}
+
+static VTermEncoding encoding_usascii = {
+  NULL,           // init
+  &decode_usascii // decode
+};
+
+struct StaticTableEncoding {
+  const VTermEncoding enc;
+  const uint32_t chars[128];
+};
+
+static void decode_table(VTermEncoding *enc, void *data UNUSED,
+                         uint32_t cp[], int *cpi, int cplen,
+                         const char bytes[], size_t *pos, size_t bytelen)
+{
+  struct StaticTableEncoding *table = (struct StaticTableEncoding *)enc;
+  int is_gr = bytes[*pos] & 0x80;
+
+  for(; *pos < bytelen && *cpi < cplen; (*pos)++) {
+    unsigned char c = bytes[*pos] ^ is_gr;
+
+    if(c < 0x20 || c == 0x7f || c >= 0x80)
+      return;
+
+    if(table->chars[c])
+      cp[(*cpi)++] = table->chars[c];
+    else
+      cp[(*cpi)++] = c;
+  }
+}
+
+#include "encoding/DECdrawing.inc"
+#include "encoding/uk.inc"
+
+static struct {
+  VTermEncodingType type;
+  char designation;
+  VTermEncoding *enc;
+}
+encodings[] = {
+  { ENC_UTF8,      'u', &encoding_utf8 },
+  { ENC_SINGLE_94, '0', (VTermEncoding*)&encoding_DECdrawing },
+  { ENC_SINGLE_94, 'A', (VTermEncoding*)&encoding_uk },
+  { ENC_SINGLE_94, 'B', &encoding_usascii },
+  { 0, 0, NULL },
+};
+
+/* This ought to be INTERNAL but isn't because it's used by unit testing */
+VTermEncoding *vterm_lookup_encoding(VTermEncodingType type, char designation)
+{
+  for(int i = 0; encodings[i].designation; i++)
+    if(encodings[i].type == type && encodings[i].designation == designation)
+      return encodings[i].enc;
+  return NULL;
+}
diff --git a/src/libvterm/src/encoding/DECdrawing.inc b/src/libvterm/src/encoding/DECdrawing.inc
new file mode 100644
index 0000000..978f98c
--- /dev/null
+++ b/src/libvterm/src/encoding/DECdrawing.inc
@@ -0,0 +1,136 @@
+static const struct StaticTableEncoding encoding_DECdrawing = {
+  {
+    NULL, /* init */
+    &decode_table /* decode */
+  },
+  {
+    0x0, /* 0 */
+    0x0, /* 1 */
+    0x0, /* 2 */
+    0x0, /* 3 */
+    0x0, /* 4 */
+    0x0, /* 5 */
+    0x0, /* 6 */
+    0x0, /* 7 */
+    0x0, /* 8 */
+    0x0, /* 9 */
+    0x0, /* 10 */
+    0x0, /* 11 */
+    0x0, /* 12 */
+    0x0, /* 13 */
+    0x0, /* 14 */
+    0x0, /* 15 */
+    0x0, /* 16 */
+    0x0, /* 17 */
+    0x0, /* 18 */
+    0x0, /* 19 */
+    0x0, /* 20 */
+    0x0, /* 21 */
+    0x0, /* 22 */
+    0x0, /* 23 */
+    0x0, /* 24 */
+    0x0, /* 25 */
+    0x0, /* 26 */
+    0x0, /* 27 */
+    0x0, /* 28 */
+    0x0, /* 29 */
+    0x0, /* 30 */
+    0x0, /* 31 */
+    0x0, /* 32 */
+    0x0, /* 33 */
+    0x0, /* 34 */
+    0x0, /* 35 */
+    0x0, /* 36 */
+    0x0, /* 37 */
+    0x0, /* 38 */
+    0x0, /* 39 */
+    0x0, /* 40 */
+    0x0, /* 41 */
+    0x0, /* 42 */
+    0x0, /* 43 */
+    0x0, /* 44 */
+    0x0, /* 45 */
+    0x0, /* 46 */
+    0x0, /* 47 */
+    0x0, /* 48 */
+    0x0, /* 49 */
+    0x0, /* 50 */
+    0x0, /* 51 */
+    0x0, /* 52 */
+    0x0, /* 53 */
+    0x0, /* 54 */
+    0x0, /* 55 */
+    0x0, /* 56 */
+    0x0, /* 57 */
+    0x0, /* 58 */
+    0x0, /* 59 */
+    0x0, /* 60 */
+    0x0, /* 61 */
+    0x0, /* 62 */
+    0x0, /* 63 */
+    0x0, /* 64 */
+    0x0, /* 65 */
+    0x0, /* 66 */
+    0x0, /* 67 */
+    0x0, /* 68 */
+    0x0, /* 69 */
+    0x0, /* 70 */
+    0x0, /* 71 */
+    0x0, /* 72 */
+    0x0, /* 73 */
+    0x0, /* 74 */
+    0x0, /* 75 */
+    0x0, /* 76 */
+    0x0, /* 77 */
+    0x0, /* 78 */
+    0x0, /* 79 */
+    0x0, /* 80 */
+    0x0, /* 81 */
+    0x0, /* 82 */
+    0x0, /* 83 */
+    0x0, /* 84 */
+    0x0, /* 85 */
+    0x0, /* 86 */
+    0x0, /* 87 */
+    0x0, /* 88 */
+    0x0, /* 89 */
+    0x0, /* 90 */
+    0x0, /* 91 */
+    0x0, /* 92 */
+    0x0, /* 93 */
+    0x0, /* 94 */
+    0x0, /* 95 */
+    0x25C6, /* 96 */
+    0x2592, /* 97 */
+    0x2409, /* 98 */
+    0x240C, /* 99 */
+    0x240D, /* 100 */
+    0x240A, /* 101 */
+    0x00B0, /* 102 */
+    0x00B1, /* 103 */
+    0x2424, /* 104 */
+    0x240B, /* 105 */
+    0x2518, /* 106 */
+    0x2510, /* 107 */
+    0x250C, /* 108 */
+    0x2514, /* 109 */
+    0x253C, /* 110 */
+    0x23BA, /* 111 */
+    0x23BB, /* 112 */
+    0x2500, /* 113 */
+    0x23BC, /* 114 */
+    0x23BD, /* 115 */
+    0x251C, /* 116 */
+    0x2524, /* 117 */
+    0x2534, /* 118 */
+    0x252C, /* 119 */
+    0x2502, /* 120 */
+    0x2A7D, /* 121 */
+    0x2A7E, /* 122 */
+    0x03C0, /* 123 */
+    0x2260, /* 124 */
+    0x00A3, /* 125 */
+    0x00B7, /* 126 */
+    0x0, /* 127 */
+  }
+};
diff --git a/src/libvterm/src/encoding/DECdrawing.tbl b/src/libvterm/src/encoding/DECdrawing.tbl
new file mode 100644
index 0000000..6e19c50
--- /dev/null
+++ b/src/libvterm/src/encoding/DECdrawing.tbl
@@ -0,0 +1,31 @@
+6/0 = U+25C6 # BLACK DIAMOND
+6/1 = U+2592 # MEDIUM SHADE (checkerboard)
+6/2 = U+2409 # SYMBOL FOR HORIZONTAL TAB
+6/3 = U+240C # SYMBOL FOR FORM FEED
+6/4 = U+240D # SYMBOL FOR CARRIAGE RETURN
+6/5 = U+240A # SYMBOL FOR LINE FEED
+6/6 = U+00B0 # DEGREE SIGN
+6/7 = U+00B1 # PLUS-MINUS SIGN (plus or minus)
+6/8 = U+2424 # SYMBOL FOR NEW LINE
+6/9 = U+240B # SYMBOL FOR VERTICAL TAB
+6/10 = U+2518 # BOX DRAWINGS LIGHT UP AND LEFT (bottom-right corner)
+6/11 = U+2510 # BOX DRAWINGS LIGHT DOWN AND LEFT (top-right corner)
+6/12 = U+250C # BOX DRAWINGS LIGHT DOWN AND RIGHT (top-left corner)
+6/13 = U+2514 # BOX DRAWINGS LIGHT UP AND RIGHT (bottom-left corner)
+6/14 = U+253C # BOX DRAWINGS LIGHT VERTICAL AND HORIZONTAL (crossing lines)
+6/15 = U+23BA # HORIZONTAL SCAN LINE-1
+7/0 = U+23BB # HORIZONTAL SCAN LINE-3
+7/1 = U+2500 # BOX DRAWINGS LIGHT HORIZONTAL
+7/2 = U+23BC # HORIZONTAL SCAN LINE-7
+7/3 = U+23BD # HORIZONTAL SCAN LINE-9
+7/4 = U+251C # BOX DRAWINGS LIGHT VERTICAL AND RIGHT
+7/5 = U+2524 # BOX DRAWINGS LIGHT VERTICAL AND LEFT
+7/6 = U+2534 # BOX DRAWINGS LIGHT UP AND HORIZONTAL
+7/7 = U+252C # BOX DRAWINGS LIGHT DOWN AND HORIZONTAL
+7/8 = U+2502 # BOX DRAWINGS LIGHT VERTICAL
+7/9 = U+2A7D # LESS-THAN OR SLANTED EQUAL-TO
+7/10 = U+2A7E # GREATER-THAN OR SLANTED EQUAL-TO
+7/11 = U+03C0 # GREEK SMALL LETTER PI
+7/12 = U+2260 # NOT EQUAL TO
+7/13 = U+00A3 # POUND SIGN
+7/14 = U+00B7 # MIDDLE DOT
diff --git a/src/libvterm/src/encoding/uk.inc b/src/libvterm/src/encoding/uk.inc
new file mode 100644
index 0000000..49ced5a
--- /dev/null
+++ b/src/libvterm/src/encoding/uk.inc
@@ -0,0 +1,136 @@
+static const struct StaticTableEncoding encoding_uk = {
+  {
+    NULL, /* init */
+    &decode_table /* decode */
+  },
+  {
+    0x0, /* 0 */
+    0x0, /* 1 */
+    0x0, /* 2 */
+    0x0, /* 3 */
+    0x0, /* 4 */
+    0x0, /* 5 */
+    0x0, /* 6 */
+    0x0, /* 7 */
+    0x0, /* 8 */
+    0x0, /* 9 */
+    0x0, /* 10 */
+    0x0, /* 11 */
+    0x0, /* 12 */
+    0x0, /* 13 */
+    0x0, /* 14 */
+    0x0, /* 15 */
+    0x0, /* 16 */
+    0x0, /* 17 */
+    0x0, /* 18 */
+    0x0, /* 19 */
+    0x0, /* 20 */
+    0x0, /* 21 */
+    0x0, /* 22 */
+    0x0, /* 23 */
+    0x0, /* 24 */
+    0x0, /* 25 */
+    0x0, /* 26 */
+    0x0, /* 27 */
+    0x0, /* 28 */
+    0x0, /* 29 */
+    0x0, /* 30 */
+    0x0, /* 31 */
+    0x0, /* 32 */
+    0x0, /* 33 */
+    0x0, /* 34 */
+    0x00a3, /* 35 */
+    0x0, /* 36 */
+    0x0, /* 37 */
+    0x0, /* 38 */
+    0x0, /* 39 */
+    0x0, /* 40 */
+    0x0, /* 41 */
+    0x0, /* 42 */
+    0x0, /* 43 */
+    0x0, /* 44 */
+    0x0, /* 45 */
+    0x0, /* 46 */
+    0x0, /* 47 */
+    0x0, /* 48 */
+    0x0, /* 49 */
+    0x0, /* 50 */
+    0x0, /* 51 */
+    0x0, /* 52 */
+    0x0, /* 53 */
+    0x0, /* 54 */
+    0x0, /* 55 */
+    0x0, /* 56 */
+    0x0, /* 57 */
+    0x0, /* 58 */
+    0x0, /* 59 */
+    0x0, /* 60 */
+    0x0, /* 61 */
+    0x0, /* 62 */
+    0x0, /* 63 */
+    0x0, /* 64 */
+    0x0, /* 65 */
+    0x0, /* 66 */
+    0x0, /* 67 */
+    0x0, /* 68 */
+    0x0, /* 69 */
+    0x0, /* 70 */
+    0x0, /* 71 */
+    0x0, /* 72 */
+    0x0, /* 73 */
+    0x0, /* 74 */
+    0x0, /* 75 */
+    0x0, /* 76 */
+    0x0, /* 77 */
+    0x0, /* 78 */
+    0x0, /* 79 */
+    0x0, /* 80 */
+    0x0, /* 81 */
+    0x0, /* 82 */
+    0x0, /* 83 */
+    0x0, /* 84 */
+    0x0, /* 85 */
+    0x0, /* 86 */
+    0x0, /* 87 */
+    0x0, /* 88 */
+    0x0, /* 89 */
+    0x0, /* 90 */
+    0x0, /* 91 */
+    0x0, /* 92 */
+    0x0, /* 93 */
+    0x0, /* 94 */
+    0x0, /* 95 */
+    0x0, /* 96 */
+    0x0, /* 97 */
+    0x0, /* 98 */
+    0x0, /* 99 */
+    0x0, /* 100 */
+    0x0, /* 101 */
+    0x0, /* 102 */
+    0x0, /* 103 */
+    0x0, /* 104 */
+    0x0, /* 105 */
+    0x0, /* 106 */
+    0x0, /* 107 */
+    0x0, /* 108 */
+    0x0, /* 109 */
+    0x0, /* 110 */
+    0x0, /* 111 */
+    0x0, /* 112 */
+    0x0, /* 113 */
+    0x0, /* 114 */
+    0x0, /* 115 */
+    0x0, /* 116 */
+    0x0, /* 117 */
+    0x0, /* 118 */
+    0x0, /* 119 */
+    0x0, /* 120 */
+    0x0, /* 121 */
+    0x0, /* 122 */
+    0x0, /* 123 */
+    0x0, /* 124 */
+    0x0, /* 125 */
+    0x0, /* 126 */
+    0x0, /* 127 */
+  }
+};
diff --git a/src/libvterm/src/encoding/uk.tbl b/src/libvterm/src/encoding/uk.tbl
new file mode 100644
index 0000000..b27b1a2
--- /dev/null
+++ b/src/libvterm/src/encoding/uk.tbl
@@ -0,0 +1 @@
+2/3 = "£"
diff --git a/src/libvterm/src/fullwidth.inc b/src/libvterm/src/fullwidth.inc
new file mode 100644
index 0000000..a703529
--- /dev/null
+++ b/src/libvterm/src/fullwidth.inc
@@ -0,0 +1,111 @@
+  { 0x1100, 0x115f },
+  { 0x231a, 0x231b },
+  { 0x2329, 0x232a },
+  { 0x23e9, 0x23ec },
+  { 0x23f0, 0x23f0 },
+  { 0x23f3, 0x23f3 },
+  { 0x25fd, 0x25fe },
+  { 0x2614, 0x2615 },
+  { 0x2648, 0x2653 },
+  { 0x267f, 0x267f },
+  { 0x2693, 0x2693 },
+  { 0x26a1, 0x26a1 },
+  { 0x26aa, 0x26ab },
+  { 0x26bd, 0x26be },
+  { 0x26c4, 0x26c5 },
+  { 0x26ce, 0x26ce },
+  { 0x26d4, 0x26d4 },
+  { 0x26ea, 0x26ea },
+  { 0x26f2, 0x26f3 },
+  { 0x26f5, 0x26f5 },
+  { 0x26fa, 0x26fa },
+  { 0x26fd, 0x26fd },
+  { 0x2705, 0x2705 },
+  { 0x270a, 0x270b },
+  { 0x2728, 0x2728 },
+  { 0x274c, 0x274c },
+  { 0x274e, 0x274e },
+  { 0x2753, 0x2755 },
+  { 0x2757, 0x2757 },
+  { 0x2795, 0x2797 },
+  { 0x27b0, 0x27b0 },
+  { 0x27bf, 0x27bf },
+  { 0x2b1b, 0x2b1c },
+  { 0x2b50, 0x2b50 },
+  { 0x2b55, 0x2b55 },
+  { 0x2e80, 0x2e99 },
+  { 0x2e9b, 0x2ef3 },
+  { 0x2f00, 0x2fd5 },
+  { 0x2ff0, 0x2ffb },
+  { 0x3000, 0x303e },
+  { 0x3041, 0x3096 },
+  { 0x3099, 0x30ff },
+  { 0x3105, 0x312f },
+  { 0x3131, 0x318e },
+  { 0x3190, 0x31ba },
+  { 0x31c0, 0x31e3 },
+  { 0x31f0, 0x321e },
+  { 0x3220, 0x3247 },
+  { 0x3250, 0x4dbf },
+  { 0x4e00, 0xa48c },
+  { 0xa490, 0xa4c6 },
+  { 0xa960, 0xa97c },
+  { 0xac00, 0xd7a3 },
+  { 0xf900, 0xfaff },
+  { 0xfe10, 0xfe19 },
+  { 0xfe30, 0xfe52 },
+  { 0xfe54, 0xfe66 },
+  { 0xfe68, 0xfe6b },
+  { 0xff01, 0xff60 },
+  { 0xffe0, 0xffe6 },
+  { 0x16fe0, 0x16fe3 },
+  { 0x17000, 0x187f7 },
+  { 0x18800, 0x18af2 },
+  { 0x1b000, 0x1b11e },
+  { 0x1b150, 0x1b152 },
+  { 0x1b164, 0x1b167 },
+  { 0x1b170, 0x1b2fb },
+  { 0x1f004, 0x1f004 },
+  { 0x1f0cf, 0x1f0cf },
+  { 0x1f18e, 0x1f18e },
+  { 0x1f191, 0x1f19a },
+  { 0x1f200, 0x1f202 },
+  { 0x1f210, 0x1f23b },
+  { 0x1f240, 0x1f248 },
+  { 0x1f250, 0x1f251 },
+  { 0x1f260, 0x1f265 },
+  { 0x1f300, 0x1f320 },
+  { 0x1f32d, 0x1f335 },
+  { 0x1f337, 0x1f37c },
+  { 0x1f37e, 0x1f393 },
+  { 0x1f3a0, 0x1f3ca },
+  { 0x1f3cf, 0x1f3d3 },
+  { 0x1f3e0, 0x1f3f0 },
+  { 0x1f3f4, 0x1f3f4 },
+  { 0x1f3f8, 0x1f43e },
+  { 0x1f440, 0x1f440 },
+  { 0x1f442, 0x1f4fc },
+  { 0x1f4ff, 0x1f53d },
+  { 0x1f54b, 0x1f54e },
+  { 0x1f550, 0x1f567 },
+  { 0x1f57a, 0x1f57a },
+  { 0x1f595, 0x1f596 },
+  { 0x1f5a4, 0x1f5a4 },
+  { 0x1f5fb, 0x1f64f },
+  { 0x1f680, 0x1f6c5 },
+  { 0x1f6cc, 0x1f6cc },
+  { 0x1f6d0, 0x1f6d2 },
+  { 0x1f6d5, 0x1f6d5 },
+  { 0x1f6eb, 0x1f6ec },
+  { 0x1f6f4, 0x1f6fa },
+  { 0x1f7e0, 0x1f7eb },
+  { 0x1f90d, 0x1f971 },
+  { 0x1f973, 0x1f976 },
+  { 0x1f97a, 0x1f9a2 },
+  { 0x1f9a5, 0x1f9aa },
+  { 0x1f9ae, 0x1f9ca },
+  { 0x1f9cd, 0x1f9ff },
+  { 0x1fa70, 0x1fa73 },
+  { 0x1fa78, 0x1fa7a },
+  { 0x1fa80, 0x1fa82 },
+  { 0x1fa90, 0x1fa95 },
diff --git a/src/libvterm/src/keyboard.c b/src/libvterm/src/keyboard.c
new file mode 100644
index 0000000..7a44670
--- /dev/null
+++ b/src/libvterm/src/keyboard.c
@@ -0,0 +1,259 @@
+#include "vterm_internal.h"
+
+#include <stdio.h>
+
+#include "utf8.h"
+
+// VIM: added
+int vterm_is_modify_other_keys(VTerm *vt)
+{
+  return vt->state->mode.modify_other_keys;
+}
+
+// VIM: added
+int vterm_is_kitty_keyboard(VTerm *vt)
+{
+  return vt->state->mode.kitty_keyboard;
+}
+
+
+void vterm_keyboard_unichar(VTerm *vt, uint32_t c, VTermModifier mod)
+{
+  // VIM: added modifyOtherKeys support
+  if (vterm_is_modify_other_keys(vt) && mod != 0) {
+    vterm_push_output_sprintf_ctrl(vt, C1_CSI, "27;%d;%d~", mod+1, c);
+    return;
+  }
+
+  // VIM: added kitty keyboard protocol support
+  if (vterm_is_kitty_keyboard(vt) && mod != 0) {
+    vterm_push_output_sprintf_ctrl(vt, C1_CSI, "%d;%du", c, mod+1);
+    return;
+  }
+
+  /* The shift modifier is never important for Unicode characters
+   * apart from Space
+   */
+  if(c != ' ')
+    mod &= ~VTERM_MOD_SHIFT;
+
+  if(mod == 0) {
+    // Normal text - ignore just shift
+    char str[6];
+    int seqlen = fill_utf8(c, str);
+    vterm_push_output_bytes(vt, str, seqlen);
+    return;
+  }
+
+  int needs_CSIu;
+  switch(c) {
+    /* Special Ctrl- letters that can't be represented elsewise */
+    case 'i': case 'j': case 'm': case '[':
+      needs_CSIu = 1;
+      break;
+    /* Ctrl-\ ] ^ _ don't need CSUu */
+    case '\\': case ']': case '^': case '_':
+      needs_CSIu = 0;
+      break;
+    /* Shift-space needs CSIu */
+    case ' ':
+      needs_CSIu = !!(mod & VTERM_MOD_SHIFT);
+      break;
+    /* All other characters needs CSIu except for letters a-z */
+    default:
+      needs_CSIu = (c < 'a' || c > 'z');
+  }
+
+  /* ALT we can just prefix with ESC; anything else requires CSI u */
+  if(needs_CSIu && (mod & ~VTERM_MOD_ALT)) {
+    vterm_push_output_sprintf_ctrl(vt, C1_CSI, "%d;%du", c, mod+1);
+    return;
+  }
+
+  if(mod & VTERM_MOD_CTRL)
+    c &= 0x1f;
+
+  vterm_push_output_sprintf(vt, "%s%c", mod & VTERM_MOD_ALT ? ESC_S : "", c);
+}
+
+typedef struct {
+  enum {
+    KEYCODE_NONE,
+    KEYCODE_LITERAL,
+    KEYCODE_TAB,
+    KEYCODE_ENTER,
+    KEYCODE_SS3,
+    KEYCODE_CSI,
+    KEYCODE_CSI_CURSOR,
+    KEYCODE_CSINUM,
+    KEYCODE_KEYPAD,
+  } type;
+  char literal;
+  int csinum;
+} keycodes_s;
+
+// Order here must be exactly the same as VTermKey enum!
+static keycodes_s keycodes[] = {
+  { KEYCODE_NONE,       0, 0 }, // NONE
+
+  { KEYCODE_ENTER,      '\r', 0 }, // ENTER
+  { KEYCODE_TAB,        '\t',  0 }, // TAB
+  { KEYCODE_LITERAL,    '\x7f', 0 }, // BACKSPACE == ASCII DEL
+  { KEYCODE_LITERAL,    '\x1b', 0 }, // ESCAPE
+
+  { KEYCODE_CSI_CURSOR, 'A', 0 }, // UP
+  { KEYCODE_CSI_CURSOR, 'B', 0 }, // DOWN
+  { KEYCODE_CSI_CURSOR, 'D', 0 }, // LEFT
+  { KEYCODE_CSI_CURSOR, 'C', 0 }, // RIGHT
+
+  { KEYCODE_CSINUM, '~', 2 },  // INS
+  { KEYCODE_CSINUM, '~', 3 },  // DEL
+  { KEYCODE_CSI_CURSOR, 'H', 0 }, // HOME
+  { KEYCODE_CSI_CURSOR, 'F', 0 }, // END
+  { KEYCODE_CSINUM, '~', 5 },  // PAGEUP
+  { KEYCODE_CSINUM, '~', 6 },  // PAGEDOWN
+};
+
+static keycodes_s keycodes_fn[] = {
+  { KEYCODE_NONE,       0, 0 },   // F0 - shouldn't happen
+  { KEYCODE_SS3,	'P', 0 }, // F1
+  { KEYCODE_SS3,	'Q', 0 }, // F2
+  { KEYCODE_SS3,	'R', 0 }, // F3
+  { KEYCODE_SS3,	'S', 0 }, // F4
+  { KEYCODE_CSINUM, '~', 15 }, // F5
+  { KEYCODE_CSINUM, '~', 17 }, // F6
+  { KEYCODE_CSINUM, '~', 18 }, // F7
+  { KEYCODE_CSINUM, '~', 19 }, // F8
+  { KEYCODE_CSINUM, '~', 20 }, // F9
+  { KEYCODE_CSINUM, '~', 21 }, // F10
+  { KEYCODE_CSINUM, '~', 23 }, // F11
+  { KEYCODE_CSINUM, '~', 24 }, // F12
+};
+
+static keycodes_s keycodes_kp[] = {
+  { KEYCODE_KEYPAD, '0', 'p' }, // KP_0
+  { KEYCODE_KEYPAD, '1', 'q' }, // KP_1
+  { KEYCODE_KEYPAD, '2', 'r' }, // KP_2
+  { KEYCODE_KEYPAD, '3', 's' }, // KP_3
+  { KEYCODE_KEYPAD, '4', 't' }, // KP_4
+  { KEYCODE_KEYPAD, '5', 'u' }, // KP_5
+  { KEYCODE_KEYPAD, '6', 'v' }, // KP_6
+  { KEYCODE_KEYPAD, '7', 'w' }, // KP_7
+  { KEYCODE_KEYPAD, '8', 'x' }, // KP_8
+  { KEYCODE_KEYPAD, '9', 'y' }, // KP_9
+  { KEYCODE_KEYPAD, '*', 'j' }, // KP_MULT
+  { KEYCODE_KEYPAD, '+', 'k' }, // KP_PLUS
+  { KEYCODE_KEYPAD, ',', 'l' }, // KP_COMMA
+  { KEYCODE_KEYPAD, '-', 'm' }, // KP_MINUS
+  { KEYCODE_KEYPAD, '.', 'n' }, // KP_PERIOD
+  { KEYCODE_KEYPAD, '/', 'o' }, // KP_DIVIDE
+  { KEYCODE_KEYPAD, '\n', 'M' }, // KP_ENTER
+  { KEYCODE_KEYPAD, '=', 'X' }, // KP_EQUAL
+};
+
+void vterm_keyboard_key(VTerm *vt, VTermKey key, VTermModifier mod)
+{
+  if(key == VTERM_KEY_NONE)
+    return;
+
+  keycodes_s k;
+  if(key < VTERM_KEY_FUNCTION_0) {
+    if(key >= sizeof(keycodes)/sizeof(keycodes[0]))
+      return;
+    k = keycodes[key];
+  }
+  else if(key >= VTERM_KEY_FUNCTION_0 && key <= VTERM_KEY_FUNCTION_MAX) {
+    if((key - VTERM_KEY_FUNCTION_0) >= sizeof(keycodes_fn)/sizeof(keycodes_fn[0]))
+      return;
+    k = keycodes_fn[key - VTERM_KEY_FUNCTION_0];
+  }
+  else if(key >= VTERM_KEY_KP_0) {
+    if((key - VTERM_KEY_KP_0) >= sizeof(keycodes_kp)/sizeof(keycodes_kp[0]))
+      return;
+    k = keycodes_kp[key - VTERM_KEY_KP_0];
+  }
+
+  switch(k.type) {
+  case KEYCODE_NONE:
+    break;
+
+  case KEYCODE_TAB:
+    if (vterm_is_kitty_keyboard(vt) && mod != 0)
+      vterm_push_output_sprintf_ctrl(vt, C1_CSI, "9;%du", mod+1);
+    /* Shift-Tab is CSI Z but plain Tab is 0x09 */
+    else if(mod == VTERM_MOD_SHIFT)
+      vterm_push_output_sprintf_ctrl(vt, C1_CSI, "Z");
+    else if(mod & VTERM_MOD_SHIFT)
+      vterm_push_output_sprintf_ctrl(vt, C1_CSI, "1;%dZ", mod+1);
+    else
+      goto case_LITERAL;
+    break;
+
+  case KEYCODE_ENTER:
+    /* Enter is CRLF in newline mode, but just LF in linefeed */
+    if(vt->state->mode.newline)
+      vterm_push_output_sprintf(vt, "\r\n");
+    else
+      goto case_LITERAL;
+    break;
+
+  case KEYCODE_LITERAL: case_LITERAL:
+    if (vterm_is_modify_other_keys(vt) && mod != 0)
+      vterm_push_output_sprintf_ctrl(vt, C1_CSI, "27;%d;%d~", mod+1, k.literal);
+    else if (vterm_is_kitty_keyboard(vt) && mod == 0 && k.literal == '\x1b')
+      vterm_push_output_sprintf_ctrl(vt, C1_CSI, "%du", k.literal);
+    else if ((vterm_is_kitty_keyboard(vt) && mod != 0)
+	|| (mod & (VTERM_MOD_SHIFT|VTERM_MOD_CTRL)))
+      vterm_push_output_sprintf_ctrl(vt, C1_CSI, "%d;%du", k.literal, mod+1);
+    else
+      vterm_push_output_sprintf(vt, mod & VTERM_MOD_ALT ? ESC_S "%c" : "%c", k.literal);
+    break;
+
+  case KEYCODE_SS3: case_SS3:
+    if(mod == 0)
+      vterm_push_output_sprintf_ctrl(vt, C1_SS3, "%c", k.literal);
+    else
+      goto case_CSI;
+    break;
+
+  case KEYCODE_CSI: case_CSI:
+    if(mod == 0)
+      vterm_push_output_sprintf_ctrl(vt, C1_CSI, "%c", k.literal);
+    else
+      vterm_push_output_sprintf_ctrl(vt, C1_CSI, "1;%d%c", mod + 1, k.literal);
+    break;
+
+  case KEYCODE_CSINUM:
+    if(mod == 0)
+      vterm_push_output_sprintf_ctrl(vt, C1_CSI, "%d%c", k.csinum, k.literal);
+    else
+      vterm_push_output_sprintf_ctrl(vt, C1_CSI, "%d;%d%c", k.csinum, mod + 1, k.literal);
+    break;
+
+  case KEYCODE_CSI_CURSOR:
+    if(vt->state->mode.cursor)
+      goto case_SS3;
+    else
+      goto case_CSI;
+
+  case KEYCODE_KEYPAD:
+    if(vt->state->mode.keypad) {
+      k.literal = k.csinum;
+      goto case_SS3;
+    }
+    else
+      goto case_LITERAL;
+  }
+}
+
+void vterm_keyboard_start_paste(VTerm *vt)
+{
+  if(vt->state->mode.bracketpaste)
+    vterm_push_output_sprintf_ctrl(vt, C1_CSI, "200~");
+}
+
+void vterm_keyboard_end_paste(VTerm *vt)
+{
+  if(vt->state->mode.bracketpaste)
+    vterm_push_output_sprintf_ctrl(vt, C1_CSI, "201~");
+}
diff --git a/src/libvterm/src/mouse.c b/src/libvterm/src/mouse.c
new file mode 100644
index 0000000..5f35d56
--- /dev/null
+++ b/src/libvterm/src/mouse.c
@@ -0,0 +1,101 @@
+#include "vterm_internal.h"
+
+#include "utf8.h"
+
+static void output_mouse(VTermState *state, int code, int pressed, int modifiers, int col, int row)
+{
+  modifiers <<= 2;
+
+  switch(state->mouse_protocol) {
+  case MOUSE_X10:
+    if(col + 0x21 > 0xff)
+      col = 0xff - 0x21;
+    if(row + 0x21 > 0xff)
+      row = 0xff - 0x21;
+
+    if(!pressed)
+      code = 3;
+
+    vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "M%c%c%c",
+        (code | modifiers) + 0x20, col + 0x21, row + 0x21);
+    break;
+
+  case MOUSE_UTF8:
+    {
+      char utf8[18]; size_t len = 0;
+
+      if(!pressed)
+        code = 3;
+
+      len += fill_utf8((code | modifiers) + 0x20, utf8 + len);
+      len += fill_utf8(col + 0x21, utf8 + len);
+      len += fill_utf8(row + 0x21, utf8 + len);
+      utf8[len] = 0;
+
+      vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "M%s", utf8);
+    }
+    break;
+
+  case MOUSE_SGR:
+    vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "<%d;%d;%d%c",
+        code | modifiers, col + 1, row + 1, pressed ? 'M' : 'm');
+    break;
+
+  case MOUSE_RXVT:
+    if(!pressed)
+      code = 3;
+
+    vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "%d;%d;%dM",
+        code | modifiers, col + 1, row + 1);
+    break;
+  }
+}
+
+void vterm_mouse_move(VTerm *vt, int row, int col, VTermModifier mod)
+{
+  VTermState *state = vt->state;
+
+  if(col == state->mouse_col && row == state->mouse_row)
+    return;
+
+  state->mouse_col = col;
+  state->mouse_row = row;
+
+  if((state->mouse_flags & MOUSE_WANT_DRAG && state->mouse_buttons) ||
+     (state->mouse_flags & MOUSE_WANT_MOVE)) {
+    int button = state->mouse_buttons & MOUSE_BUTTON_LEFT ? 1 :
+                 state->mouse_buttons & MOUSE_BUTTON_MIDDLE ? 2 :
+                 state->mouse_buttons & MOUSE_BUTTON_RIGHT ? 3 : 4;
+    output_mouse(state, button-1 + 0x20, 1, mod, col, row);
+  }
+}
+
+void vterm_mouse_button(VTerm *vt, int button, int pressed, VTermModifier mod)
+{
+  VTermState *state = vt->state;
+
+  int old_buttons = state->mouse_buttons;
+
+  if(button > 0 && button <= 3) {
+    if(pressed)
+      state->mouse_buttons |= (1 << (button-1));
+    else
+      state->mouse_buttons &= ~(1 << (button-1));
+  }
+
+  /* Most of the time we don't get button releases from 4/5/6/7 */
+  if(state->mouse_buttons == old_buttons && button < 4)
+    return;
+  if (!(state->mouse_flags & MOUSE_WANT_CLICK))
+    return;
+
+  if(!state->mouse_flags)
+    return;
+
+  if(button < 4) {
+    output_mouse(state, button-1, pressed, mod, state->mouse_col, state->mouse_row);
+  }
+  else if(button < 8) {
+    output_mouse(state, button-4 + 0x40, pressed, mod, state->mouse_col, state->mouse_row);
+  }
+}
diff --git a/src/libvterm/src/parser.c b/src/libvterm/src/parser.c
new file mode 100644
index 0000000..0d1e12b
--- /dev/null
+++ b/src/libvterm/src/parser.c
@@ -0,0 +1,404 @@
+#include "vterm_internal.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#undef DEBUG_PARSER
+
+static int is_intermed(unsigned char c)
+{
+  return c >= 0x20 && c <= 0x2f;
+}
+
+static void do_control(VTerm *vt, unsigned char control)
+{
+  if(vt->parser.callbacks && vt->parser.callbacks->control)
+    if((*vt->parser.callbacks->control)(control, vt->parser.cbdata))
+      return;
+
+  DEBUG_LOG1("libvterm: Unhandled control 0x%02x\n", control);
+}
+
+static void do_csi(VTerm *vt, char command)
+{
+#ifdef DEBUG_PARSER
+  printf("Parsed CSI args as:\n", arglen, args);
+  printf(" leader: %s\n", vt->parser.v.csi.leader);
+  for(int argi = 0; argi < vt->parser.v.csi.argi; argi++) {
+    printf(" %lu", CSI_ARG(vt->parser.v.csi.args[argi]));
+    if(!CSI_ARG_HAS_MORE(vt->parser.v.csi.args[argi]))
+      printf("\n");
+  printf(" intermed: %s\n", vt->parser.intermed);
+  }
+#endif
+
+  if(vt->parser.callbacks && vt->parser.callbacks->csi)
+    if((*vt->parser.callbacks->csi)(
+          vt->parser.v.csi.leaderlen ? vt->parser.v.csi.leader : NULL,
+          vt->parser.v.csi.args,
+          vt->parser.v.csi.argi,
+          vt->parser.intermedlen ? vt->parser.intermed : NULL,
+          command,
+          vt->parser.cbdata))
+      return;
+
+  DEBUG_LOG1("libvterm: Unhandled CSI %c\n", command);
+}
+
+static void do_escape(VTerm *vt, char command)
+{
+  char seq[INTERMED_MAX+1];
+
+  size_t len = vt->parser.intermedlen;
+  strncpy(seq, vt->parser.intermed, len);
+  seq[len++] = command;
+  seq[len]   = 0;
+
+  if(vt->parser.callbacks && vt->parser.callbacks->escape)
+    if((*vt->parser.callbacks->escape)(seq, len, vt->parser.cbdata))
+      return;
+
+  DEBUG_LOG1("libvterm: Unhandled escape ESC 0x%02x\n", command);
+}
+
+static void string_fragment(VTerm *vt, const char *str, size_t len, int final)
+{
+  VTermStringFragment frag;
+
+  frag.str = str;
+  frag.len = len;
+  frag.initial = vt->parser.string_initial;
+  frag.final = final;
+
+  switch(vt->parser.state) {
+    case OSC:
+      if(vt->parser.callbacks && vt->parser.callbacks->osc)
+        (*vt->parser.callbacks->osc)(vt->parser.v.osc.command, frag, vt->parser.cbdata);
+      break;
+
+    case DCS:
+      if(vt->parser.callbacks && vt->parser.callbacks->dcs)
+        (*vt->parser.callbacks->dcs)(vt->parser.v.dcs.command, vt->parser.v.dcs.commandlen, frag, vt->parser.cbdata);
+      break;
+
+    case APC:
+      if(vt->parser.callbacks && vt->parser.callbacks->apc)
+        (*vt->parser.callbacks->apc)(frag, vt->parser.cbdata);
+      break;
+
+    case PM:
+      if(vt->parser.callbacks && vt->parser.callbacks->pm)
+        (*vt->parser.callbacks->pm)(frag, vt->parser.cbdata);
+      break;
+
+    case SOS:
+      if(vt->parser.callbacks && vt->parser.callbacks->sos)
+        (*vt->parser.callbacks->sos)(frag, vt->parser.cbdata);
+      break;
+
+    case NORMAL:
+    case CSI_LEADER:
+    case CSI_ARGS:
+    case CSI_INTERMED:
+    case OSC_COMMAND:
+    case DCS_COMMAND:
+      break;
+  }
+
+  vt->parser.string_initial = FALSE;
+}
+
+size_t vterm_input_write(VTerm *vt, const char *bytes, size_t len)
+{
+  size_t pos = 0;
+  const char *string_start = NULL;  // init to avoid gcc warning
+
+  vt->in_backspace = 0;		    // Count down with BS key and activate when
+				    // it reaches 1
+
+  switch(vt->parser.state) {
+  case NORMAL:
+  case CSI_LEADER:
+  case CSI_ARGS:
+  case CSI_INTERMED:
+  case OSC_COMMAND:
+  case DCS_COMMAND:
+    string_start = NULL;
+    break;
+  case OSC:
+  case DCS:
+  case APC:
+  case PM:
+  case SOS:
+    string_start = bytes;
+    break;
+  }
+
+#define ENTER_STATE(st)        do { vt->parser.state = st; string_start = NULL; } while(0)
+#define ENTER_NORMAL_STATE()   ENTER_STATE(NORMAL)
+
+#define IS_STRING_STATE()      (vt->parser.state >= OSC_COMMAND)
+
+  for( ; pos < len; pos++) {
+    unsigned char c = bytes[pos];
+    int c1_allowed = !vt->mode.utf8;
+
+    if(c == 0x00 || c == 0x7f) { // NUL, DEL
+      if(IS_STRING_STATE()) {
+        string_fragment(vt, string_start, bytes + pos - string_start, FALSE);
+        string_start = bytes + pos + 1;
+      }
+      continue;
+    }
+    if(c == 0x18 || c == 0x1a) { // CAN, SUB
+      vt->parser.in_esc = FALSE;
+      ENTER_NORMAL_STATE();
+      continue;
+    }
+    else if(c == 0x1b) { // ESC
+      vt->parser.intermedlen = 0;
+      if(!IS_STRING_STATE())
+        vt->parser.state = NORMAL;
+      vt->parser.in_esc = TRUE;
+      continue;
+    }
+    else if(c == 0x07 &&  // BEL, can stand for ST in OSC or DCS state
+            IS_STRING_STATE()) {
+      // fallthrough
+    }
+    else if(c < 0x20) { // other C0
+      if(vt->parser.state == SOS)
+        continue; // All other C0s permitted in SOS
+
+      if(vterm_get_special_pty_type() == 2) {
+        if(c == 0x08) // BS
+          // Set the trick for BS output after a sequence, to delay backspace
+          // activation
+          if(pos + 2 < len && bytes[pos + 1] == 0x20 && bytes[pos + 2] == 0x08)
+            vt->in_backspace = 2; // Trigger when count down to 1
+      }
+      if(IS_STRING_STATE())
+        string_fragment(vt, string_start, bytes + pos - string_start, FALSE);
+      do_control(vt, c);
+      if(IS_STRING_STATE())
+        string_start = bytes + pos + 1;
+      continue;
+    }
+    // else fallthrough
+
+    size_t string_len = bytes + pos - string_start;
+
+    if(vt->parser.in_esc) {
+      // Hoist an ESC letter into a C1 if we're not in a string mode
+      // Always accept ESC \ == ST even in string mode
+      if(!vt->parser.intermedlen &&
+          c >= 0x40 && c < 0x60 &&
+          ((!IS_STRING_STATE() || c == 0x5c))) {
+        c += 0x40;
+        c1_allowed = TRUE;
+        if(string_len)
+          string_len -= 1;
+        vt->parser.in_esc = FALSE;
+      }
+      else {
+        string_start = NULL;
+        vt->parser.state = NORMAL;
+      }
+    }
+
+    switch(vt->parser.state) {
+    case CSI_LEADER:
+      /* Extract leader bytes 0x3c to 0x3f */
+      if(c >= 0x3c && c <= 0x3f) {
+        if(vt->parser.v.csi.leaderlen < CSI_LEADER_MAX-1)
+          vt->parser.v.csi.leader[vt->parser.v.csi.leaderlen++] = c;
+        break;
+      }
+
+      /* else fallthrough */
+      vt->parser.v.csi.leader[vt->parser.v.csi.leaderlen] = 0;
+
+      vt->parser.v.csi.argi = 0;
+      vt->parser.v.csi.args[0] = CSI_ARG_MISSING;
+      vt->parser.state = CSI_ARGS;
+
+      /* fallthrough */
+    case CSI_ARGS:
+      /* Numerical value of argument */
+      if(c >= '0' && c <= '9') {
+        if(vt->parser.v.csi.args[vt->parser.v.csi.argi] == CSI_ARG_MISSING)
+          vt->parser.v.csi.args[vt->parser.v.csi.argi] = 0;
+        vt->parser.v.csi.args[vt->parser.v.csi.argi] *= 10;
+        vt->parser.v.csi.args[vt->parser.v.csi.argi] += c - '0';
+        break;
+      }
+      if(c == ':') {
+        vt->parser.v.csi.args[vt->parser.v.csi.argi] |= CSI_ARG_FLAG_MORE;
+        c = ';';
+      }
+      if(c == ';') {
+        vt->parser.v.csi.argi++;
+        vt->parser.v.csi.args[vt->parser.v.csi.argi] = CSI_ARG_MISSING;
+        break;
+      }
+
+      /* else fallthrough */
+      vt->parser.v.csi.argi++;
+      vt->parser.intermedlen = 0;
+      vt->parser.state = CSI_INTERMED;
+      // FALLTHROUGH
+    case CSI_INTERMED:
+      if(is_intermed(c)) {
+        if(vt->parser.intermedlen < INTERMED_MAX-1)
+          vt->parser.intermed[vt->parser.intermedlen++] = c;
+        break;
+      }
+      else if(c == 0x1b) {
+        /* ESC in CSI cancels */
+      }
+      else if(c >= 0x40 && c <= 0x7e) {
+        vt->parser.intermed[vt->parser.intermedlen] = 0;
+        do_csi(vt, c);
+      }
+      /* else was invalid CSI */
+
+      ENTER_NORMAL_STATE();
+      break;
+
+    case OSC_COMMAND:
+      /* Numerical value of command */
+      if(c >= '0' && c <= '9') {
+        if(vt->parser.v.osc.command == -1)
+          vt->parser.v.osc.command = 0;
+        else
+          vt->parser.v.osc.command *= 10;
+        vt->parser.v.osc.command += c - '0';
+        break;
+      }
+      if(c == ';') {
+        vt->parser.state = OSC;
+        string_start = bytes + pos + 1;
+        break;
+      }
+
+      /* else fallthrough */
+      string_start = bytes + pos;
+      string_len   = 0;
+      vt->parser.state = OSC;
+      goto string_state;
+
+    case DCS_COMMAND:
+      if(vt->parser.v.dcs.commandlen < CSI_LEADER_MAX)
+        vt->parser.v.dcs.command[vt->parser.v.dcs.commandlen++] = c;
+
+      if(c >= 0x40 && c<= 0x7e) {
+        string_start = bytes + pos + 1;
+        vt->parser.state = DCS;
+      }
+      break;
+
+string_state:
+    case OSC:
+    case DCS:
+    case APC:
+    case PM:
+    case SOS:
+      if(c == 0x07 || (c1_allowed && c == 0x9c)) {
+        string_fragment(vt, string_start, string_len, TRUE);
+        ENTER_NORMAL_STATE();
+      }
+      break;
+
+    case NORMAL:
+      if(vt->parser.in_esc) {
+        if(is_intermed(c)) {
+          if(vt->parser.intermedlen < INTERMED_MAX-1)
+            vt->parser.intermed[vt->parser.intermedlen++] = c;
+        }
+        else if(c >= 0x30 && c < 0x7f) {
+          do_escape(vt, c);
+          vt->parser.in_esc = 0;
+          ENTER_NORMAL_STATE();
+        }
+        else {
+          DEBUG_LOG1("TODO: Unhandled byte %02x in Escape\n", c);
+        }
+        break;
+      }
+      if(c1_allowed && c >= 0x80 && c < 0xa0) {
+        switch(c) {
+        case 0x90: // DCS
+          vt->parser.string_initial = TRUE;
+          vt->parser.v.dcs.commandlen = 0;
+          ENTER_STATE(DCS_COMMAND);
+          break;
+        case 0x98: // SOS
+          vt->parser.string_initial = TRUE;
+          ENTER_STATE(SOS);
+          string_start = bytes + pos + 1;
+          string_len = 0;
+          break;
+        case 0x9b: // CSI
+          vt->parser.v.csi.leaderlen = 0;
+          ENTER_STATE(CSI_LEADER);
+          break;
+        case 0x9d: // OSC
+          vt->parser.v.osc.command = -1;
+          vt->parser.string_initial = TRUE;
+          string_start = bytes + pos + 1;
+          ENTER_STATE(OSC_COMMAND);
+          break;
+        case 0x9e: // PM
+          vt->parser.string_initial = TRUE;
+          ENTER_STATE(PM);
+          string_start = bytes + pos + 1;
+          string_len = 0;
+          break;
+        case 0x9f: // APC
+          vt->parser.string_initial = TRUE;
+          ENTER_STATE(APC);
+          string_start = bytes + pos + 1;
+          string_len = 0;
+          break;
+        default:
+          do_control(vt, c);
+          break;
+        }
+      }
+      else {
+        size_t eaten = 0;
+        if(vt->parser.callbacks && vt->parser.callbacks->text)
+          eaten = (*vt->parser.callbacks->text)(bytes + pos, len - pos, vt->parser.cbdata);
+
+        if(!eaten) {
+          DEBUG_LOG("libvterm: Text callback did not consume any input\n");
+          /* force it to make progress */
+          eaten = 1;
+        }
+
+        pos += (eaten - 1); // we'll ++ it again in a moment
+      }
+      break;
+    }
+  }
+
+  if(string_start) {
+    size_t string_len = bytes + pos - string_start;
+    if(vt->parser.in_esc)
+      string_len -= 1;
+    string_fragment(vt, string_start, string_len, FALSE);
+  }
+
+  return len;
+}
+
+void vterm_parser_set_callbacks(VTerm *vt, const VTermParserCallbacks *callbacks, void *user)
+{
+  vt->parser.callbacks = callbacks;
+  vt->parser.cbdata = user;
+}
+
+void *vterm_parser_get_cbdata(VTerm *vt)
+{
+  return vt->parser.cbdata;
+}
diff --git a/src/libvterm/src/pen.c b/src/libvterm/src/pen.c
new file mode 100644
index 0000000..1c6cd4e
--- /dev/null
+++ b/src/libvterm/src/pen.c
@@ -0,0 +1,629 @@
+#include "vterm_internal.h"
+
+#include <stdio.h>
+
+/**
+ * Structure used to store RGB triples without the additional metadata stored in
+ * VTermColor.
+ */
+typedef struct {
+  uint8_t red, green, blue;
+} VTermRGB;
+
+static const VTermRGB ansi_colors[] = {
+  /* R    G    B */
+  {   0,   0,   0 }, // black
+  { 224,   0,   0 }, // red
+  {   0, 224,   0 }, // green
+  { 224, 224,   0 }, // yellow
+  {   0,   0, 224 }, // blue
+  { 224,   0, 224 }, // magenta
+  {   0, 224, 224 }, // cyan
+  { 224, 224, 224 }, // white == light grey
+
+  // high intensity
+  { 128, 128, 128 }, // black
+  { 255,  64,  64 }, // red
+  {  64, 255,  64 }, // green
+  { 255, 255,  64 }, // yellow
+  {  64,  64, 255 }, // blue
+  { 255,  64, 255 }, // magenta
+  {  64, 255, 255 }, // cyan
+  { 255, 255, 255 }, // white for real
+};
+
+static int ramp6[] = {
+  0x00, 0x5F, 0x87, 0xAF, 0xD7, 0xFF,
+};
+
+// Use 0x81 instead of 0x80 to be able to distinguish from ansi black
+static int ramp24[] = {
+  0x08, 0x12, 0x1C, 0x26, 0x30, 0x3A, 0x44, 0x4E, 0x58, 0x62, 0x6C, 0x76,
+  0x81, 0x8A, 0x94, 0x9E, 0xA8, 0xB2, 0xBC, 0xC6, 0xD0, 0xDA, 0xE4, 0xEE,
+};
+
+static void lookup_default_colour_ansi(long idx, VTermColor *col)
+{
+  // VIM: store both RGB color and index
+  vterm_color_rgb(
+      col,
+      ansi_colors[idx].red, ansi_colors[idx].green, ansi_colors[idx].blue);
+  col->index = (uint8_t)idx;
+  col->type = VTERM_COLOR_INDEXED;
+}
+
+static int lookup_colour_ansi(const VTermState *state, long index, VTermColor *col)
+{
+  if(index >= 0 && index < 16) {
+    *col = state->colors[index];
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+static int lookup_colour_palette(const VTermState *state, long index, VTermColor *col)
+{
+  if(index >= 0 && index < 16) {
+    // Normal 8 colours or high intensity - parse as palette 0
+    return lookup_colour_ansi(state, index, col);
+  }
+  else if(index >= 16 && index < 232) {
+    // 216-colour cube
+    index -= 16;
+
+    vterm_color_rgb(col, ramp6[index/6/6 % 6],
+                         ramp6[index/6   % 6],
+                         ramp6[index     % 6]);
+
+    return TRUE;
+  }
+  else if(index >= 232 && index < 256) {
+    // 24 greyscales
+    index -= 232;
+
+    vterm_color_rgb(col, ramp24[index], ramp24[index], ramp24[index]);
+
+    return TRUE;
+  }
+
+  return FALSE;
+}
+
+static int lookup_colour(const VTermState *state, int palette, const long args[], int argcount, VTermColor *col)
+{
+  switch(palette) {
+  case 2: // RGB mode - 3 args contain colour values directly
+    if(argcount < 3)
+      return argcount;
+
+    vterm_color_rgb(col, (uint8_t)CSI_ARG(args[0]), (uint8_t)CSI_ARG(args[1]), (uint8_t)CSI_ARG(args[2]));
+
+    return 3;
+
+  case 5: // XTerm 256-colour mode
+    if (!argcount || CSI_ARG_IS_MISSING(args[0])) {
+      return argcount ? 1 : 0;
+    }
+
+    lookup_colour_palette(state, args[0], col);
+    return 1;
+
+  default:
+    DEBUG_LOG1("Unrecognised colour palette %d\n", palette);
+    return 0;
+  }
+}
+
+// Some conveniences
+
+static void setpenattr(VTermState *state, VTermAttr attr, VTermValueType type UNUSED, VTermValue *val)
+{
+#ifdef DEBUG
+  if(type != vterm_get_attr_type(attr)) {
+    DEBUG_LOG3("Cannot set attr %d as it has type %d, not type %d\n",
+        attr, vterm_get_attr_type(attr), type);
+    return;
+  }
+#endif
+  if(state->callbacks && state->callbacks->setpenattr)
+    (*state->callbacks->setpenattr)(attr, val, state->cbdata);
+}
+
+static void setpenattr_bool(VTermState *state, VTermAttr attr, int boolean)
+{
+  VTermValue val;
+  val.boolean = boolean;
+  setpenattr(state, attr, VTERM_VALUETYPE_BOOL, &val);
+}
+
+static void setpenattr_int(VTermState *state, VTermAttr attr, int number)
+{
+  VTermValue val;
+  val.number = number;
+  setpenattr(state, attr, VTERM_VALUETYPE_INT, &val);
+}
+
+static void setpenattr_col(VTermState *state, VTermAttr attr, VTermColor color)
+{
+  VTermValue val;
+  val.color = color;
+  setpenattr(state, attr, VTERM_VALUETYPE_COLOR, &val);
+}
+
+static void set_pen_col_ansi(VTermState *state, VTermAttr attr, long col)
+{
+  VTermColor *colp = (attr == VTERM_ATTR_BACKGROUND) ? &state->pen.bg : &state->pen.fg;
+
+  lookup_colour_ansi(state, col, colp);
+
+  setpenattr_col(state, attr, *colp);
+}
+
+INTERNAL void vterm_state_newpen(VTermState *state)
+{
+  // 90% grey so that pure white is brighter
+  vterm_color_rgb(&state->default_fg, 240, 240, 240);
+  vterm_color_rgb(&state->default_bg, 0, 0, 0);
+  vterm_state_set_default_colors(state, &state->default_fg, &state->default_bg);
+
+  for(int col = 0; col < 16; col++)
+    lookup_default_colour_ansi(col, &state->colors[col]);
+}
+
+INTERNAL void vterm_state_resetpen(VTermState *state)
+{
+  state->pen.bold = 0;      setpenattr_bool(state, VTERM_ATTR_BOLD, 0);
+  state->pen.underline = 0; setpenattr_int (state, VTERM_ATTR_UNDERLINE, 0);
+  state->pen.italic = 0;    setpenattr_bool(state, VTERM_ATTR_ITALIC, 0);
+  state->pen.blink = 0;     setpenattr_bool(state, VTERM_ATTR_BLINK, 0);
+  state->pen.reverse = 0;   setpenattr_bool(state, VTERM_ATTR_REVERSE, 0);
+  state->pen.conceal = 0;   setpenattr_bool(state, VTERM_ATTR_CONCEAL, 0);
+  state->pen.strike = 0;    setpenattr_bool(state, VTERM_ATTR_STRIKE, 0);
+  state->pen.font = 0;      setpenattr_int (state, VTERM_ATTR_FONT, 0);
+  state->pen.small = 0;     setpenattr_bool(state, VTERM_ATTR_SMALL, 0);
+  state->pen.baseline = 0;  setpenattr_int (state, VTERM_ATTR_BASELINE, 0);
+
+  state->pen.fg = state->default_fg;  setpenattr_col(state, VTERM_ATTR_FOREGROUND, state->default_fg);
+  state->pen.bg = state->default_bg;  setpenattr_col(state, VTERM_ATTR_BACKGROUND, state->default_bg);
+}
+
+INTERNAL void vterm_state_savepen(VTermState *state, int save)
+{
+  if(save) {
+    state->saved.pen = state->pen;
+  }
+  else {
+    state->pen = state->saved.pen;
+
+    setpenattr_bool(state, VTERM_ATTR_BOLD,      state->pen.bold);
+    setpenattr_int (state, VTERM_ATTR_UNDERLINE, state->pen.underline);
+    setpenattr_bool(state, VTERM_ATTR_ITALIC,    state->pen.italic);
+    setpenattr_bool(state, VTERM_ATTR_BLINK,     state->pen.blink);
+    setpenattr_bool(state, VTERM_ATTR_REVERSE,   state->pen.reverse);
+    setpenattr_bool(state, VTERM_ATTR_CONCEAL,   state->pen.conceal);
+    setpenattr_bool(state, VTERM_ATTR_STRIKE,    state->pen.strike);
+    setpenattr_int (state, VTERM_ATTR_FONT,      state->pen.font);
+    setpenattr_bool(state, VTERM_ATTR_SMALL,     state->pen.small);
+    setpenattr_int (state, VTERM_ATTR_BASELINE,  state->pen.baseline);
+
+    setpenattr_col( state, VTERM_ATTR_FOREGROUND, state->pen.fg);
+    setpenattr_col( state, VTERM_ATTR_BACKGROUND, state->pen.bg);
+  }
+}
+
+void vterm_color_rgb(VTermColor *col, uint8_t red, uint8_t green, uint8_t blue)
+{
+  col->type = VTERM_COLOR_RGB;
+  col->red   = red;
+  col->green = green;
+  col->blue  = blue;
+}
+
+void vterm_color_indexed(VTermColor *col, uint8_t idx)
+{
+  col->type = VTERM_COLOR_INDEXED;
+  col->index = idx;
+}
+
+int vterm_color_is_equal(const VTermColor *a, const VTermColor *b)
+{
+  /* First make sure that the two colours are of the same type (RGB/Indexed) */
+  if (a->type != b->type) {
+    return FALSE;
+  }
+
+  /* Depending on the type inspect the corresponding members */
+  if (VTERM_COLOR_IS_INDEXED(a)) {
+    return a->index == b->index;
+  }
+  else if (VTERM_COLOR_IS_RGB(a)) {
+    return    (a->red   == b->red)
+           && (a->green == b->green)
+           && (a->blue  == b->blue);
+  }
+
+  return 0;
+}
+
+void vterm_state_get_default_colors(const VTermState *state, VTermColor *default_fg, VTermColor *default_bg)
+{
+  *default_fg = state->default_fg;
+  *default_bg = state->default_bg;
+}
+
+void vterm_state_get_palette_color(const VTermState *state, int index, VTermColor *col)
+{
+  lookup_colour_palette(state, index, col);
+}
+
+void vterm_state_set_default_colors(VTermState *state, const VTermColor *default_fg, const VTermColor *default_bg)
+{
+  /* Copy the given colors */
+  state->default_fg = *default_fg;
+  state->default_bg = *default_bg;
+
+  /* Make sure the correct type flags are set */
+  state->default_fg.type = (state->default_fg.type & ~VTERM_COLOR_DEFAULT_MASK)
+                         | VTERM_COLOR_DEFAULT_FG;
+  state->default_bg.type = (state->default_bg.type & ~VTERM_COLOR_DEFAULT_MASK)
+                         | VTERM_COLOR_DEFAULT_BG;
+}
+
+void vterm_state_set_palette_color(VTermState *state, int index, const VTermColor *col)
+{
+  if(index >= 0 && index < 16)
+  {
+    state->colors[index] = *col;
+    state->colors[index].index = index + 1;
+  }
+}
+
+void vterm_state_convert_color_to_rgb(const VTermState *state, VTermColor *col)
+{
+  if (VTERM_COLOR_IS_INDEXED(col)) { /* Convert indexed colors to RGB */
+    lookup_colour_palette(state, col->index, col);
+  }
+  col->type &= VTERM_COLOR_TYPE_MASK; /* Reset any metadata but the type */
+}
+
+void vterm_state_set_bold_highbright(VTermState *state, int bold_is_highbright)
+{
+  state->bold_is_highbright = bold_is_highbright;
+}
+
+INTERNAL void vterm_state_setpen(VTermState *state, const long args[], int argcount)
+{
+  // SGR - ECMA-48 8.3.117
+
+  int argi = 0;
+  int value;
+
+  while(argi < argcount) {
+    // This logic is easier to do 'done' backwards; set it true, and make it
+    // false again in the 'default' case
+    int done = 1;
+
+    long arg;
+    switch(arg = CSI_ARG(args[argi])) {
+    case CSI_ARG_MISSING:
+    case 0: // Reset
+      vterm_state_resetpen(state);
+      break;
+
+    case 1: { // Bold on
+      const VTermColor *fg = &state->pen.fg;
+      state->pen.bold = 1;
+      setpenattr_bool(state, VTERM_ATTR_BOLD, 1);
+      if(!VTERM_COLOR_IS_DEFAULT_FG(fg) && VTERM_COLOR_IS_INDEXED(fg) && fg->index < 8 && state->bold_is_highbright)
+        set_pen_col_ansi(state, VTERM_ATTR_FOREGROUND, fg->index + (state->pen.bold ? 8 : 0));
+      break;
+    }
+
+    case 3: // Italic on
+      state->pen.italic = 1;
+      setpenattr_bool(state, VTERM_ATTR_ITALIC, 1);
+      break;
+
+    case 4: // Underline
+      state->pen.underline = VTERM_UNDERLINE_SINGLE;
+      if(CSI_ARG_HAS_MORE(args[argi])) {
+        argi++;
+        switch(CSI_ARG(args[argi])) {
+          case 0:
+            state->pen.underline = 0;
+            break;
+          case 1:
+            state->pen.underline = VTERM_UNDERLINE_SINGLE;
+            break;
+          case 2:
+            state->pen.underline = VTERM_UNDERLINE_DOUBLE;
+            break;
+          case 3:
+            state->pen.underline = VTERM_UNDERLINE_CURLY;
+            break;
+        }
+      }
+      setpenattr_int(state, VTERM_ATTR_UNDERLINE, state->pen.underline);
+      break;
+
+    case 5: // Blink
+      state->pen.blink = 1;
+      setpenattr_bool(state, VTERM_ATTR_BLINK, 1);
+      break;
+
+    case 7: // Reverse on
+      state->pen.reverse = 1;
+      setpenattr_bool(state, VTERM_ATTR_REVERSE, 1);
+      break;
+
+    case 8: // Conceal on
+      state->pen.conceal = 1;
+      setpenattr_bool(state, VTERM_ATTR_CONCEAL, 1);
+      break;
+
+    case 9: // Strikethrough on
+      state->pen.strike = 1;
+      setpenattr_bool(state, VTERM_ATTR_STRIKE, 1);
+      break;
+
+    case 10: case 11: case 12: case 13: case 14:
+    case 15: case 16: case 17: case 18: case 19: // Select font
+      state->pen.font = CSI_ARG(args[argi]) - 10;
+      setpenattr_int(state, VTERM_ATTR_FONT, state->pen.font);
+      break;
+
+    case 21: // Underline double
+      state->pen.underline = VTERM_UNDERLINE_DOUBLE;
+      setpenattr_int(state, VTERM_ATTR_UNDERLINE, state->pen.underline);
+      break;
+
+    case 22: // Bold off
+      state->pen.bold = 0;
+      setpenattr_bool(state, VTERM_ATTR_BOLD, 0);
+      break;
+
+    case 23: // Italic and Gothic (currently unsupported) off
+      state->pen.italic = 0;
+      setpenattr_bool(state, VTERM_ATTR_ITALIC, 0);
+      break;
+
+    case 24: // Underline off
+      state->pen.underline = 0;
+      setpenattr_int(state, VTERM_ATTR_UNDERLINE, 0);
+      break;
+
+    case 25: // Blink off
+      state->pen.blink = 0;
+      setpenattr_bool(state, VTERM_ATTR_BLINK, 0);
+      break;
+
+    case 27: // Reverse off
+      state->pen.reverse = 0;
+      setpenattr_bool(state, VTERM_ATTR_REVERSE, 0);
+      break;
+
+    case 28: // Conceal off (Reveal)
+      state->pen.conceal = 0;
+      setpenattr_bool(state, VTERM_ATTR_CONCEAL, 0);
+      break;
+
+    case 29: // Strikethrough off
+      state->pen.strike = 0;
+      setpenattr_bool(state, VTERM_ATTR_STRIKE, 0);
+      break;
+
+    case 30: case 31: case 32: case 33:
+    case 34: case 35: case 36: case 37: // Foreground colour palette
+      value = CSI_ARG(args[argi]) - 30;
+      if(state->pen.bold && state->bold_is_highbright)
+        value += 8;
+      set_pen_col_ansi(state, VTERM_ATTR_FOREGROUND, value);
+      break;
+
+    case 38: // Foreground colour alternative palette
+      if(argcount - argi < 1)
+        return;
+      argi += 1 + lookup_colour(state, CSI_ARG(args[argi+1]), args+argi+2, argcount-argi-2, &state->pen.fg);
+      setpenattr_col(state, VTERM_ATTR_FOREGROUND, state->pen.fg);
+      break;
+
+    case 39: // Foreground colour default
+      state->pen.fg = state->default_fg;
+      setpenattr_col(state, VTERM_ATTR_FOREGROUND, state->pen.fg);
+      break;
+
+    case 40: case 41: case 42: case 43:
+    case 44: case 45: case 46: case 47: // Background colour palette
+      value = CSI_ARG(args[argi]) - 40;
+      set_pen_col_ansi(state, VTERM_ATTR_BACKGROUND, value);
+      break;
+
+    case 48: // Background colour alternative palette
+      if(argcount - argi < 1)
+        return;
+      argi += 1 + lookup_colour(state, CSI_ARG(args[argi+1]), args+argi+2, argcount-argi-2, &state->pen.bg);
+      setpenattr_col(state, VTERM_ATTR_BACKGROUND, state->pen.bg);
+      break;
+
+    case 49: // Default background
+      state->pen.bg = state->default_bg;
+      setpenattr_col(state, VTERM_ATTR_BACKGROUND, state->pen.bg);
+      break;
+
+    case 73: // Superscript
+    case 74: // Subscript
+    case 75: // Superscript/subscript off
+      state->pen.small = (arg != 75);
+      state->pen.baseline =
+        (arg == 73) ? VTERM_BASELINE_RAISE :
+        (arg == 74) ? VTERM_BASELINE_LOWER :
+                      VTERM_BASELINE_NORMAL;
+      setpenattr_bool(state, VTERM_ATTR_SMALL,    state->pen.small);
+      setpenattr_int (state, VTERM_ATTR_BASELINE, state->pen.baseline);
+      break;
+
+    case 90: case 91: case 92: case 93:
+    case 94: case 95: case 96: case 97: // Foreground colour high-intensity palette
+      value = CSI_ARG(args[argi]) - 90 + 8;
+      set_pen_col_ansi(state, VTERM_ATTR_FOREGROUND, value);
+      break;
+
+    case 100: case 101: case 102: case 103:
+    case 104: case 105: case 106: case 107: // Background colour high-intensity palette
+      value = CSI_ARG(args[argi]) - 100 + 8;
+      set_pen_col_ansi(state, VTERM_ATTR_BACKGROUND, value);
+      break;
+
+    default:
+      done = 0;
+      break;
+    }
+
+    if(!done)
+    {
+      DEBUG_LOG1("libvterm: Unhandled CSI SGR %ld\n", arg);
+    }
+
+    while(CSI_ARG_HAS_MORE(args[argi++]))
+      ;
+  }
+}
+
+static int vterm_state_getpen_color(const VTermColor *col, int argi, long args[], int fg)
+{
+    /* Do nothing if the given color is the default color */
+    if (( fg && VTERM_COLOR_IS_DEFAULT_FG(col)) ||
+        (!fg && VTERM_COLOR_IS_DEFAULT_BG(col))) {
+        return argi;
+    }
+
+    /* Decide whether to send an indexed color or an RGB color */
+    if (VTERM_COLOR_IS_INDEXED(col)) {
+        const uint8_t idx = col->index;
+        if (idx < 8) {
+            args[argi++] = (idx + (fg ? 30 : 40));
+        }
+        else if (idx < 16) {
+            args[argi++] = (idx - 8 + (fg ? 90 : 100));
+        }
+        else {
+            args[argi++] = CSI_ARG_FLAG_MORE | (fg ? 38 : 48);
+            args[argi++] = CSI_ARG_FLAG_MORE | 5;
+            args[argi++] = idx;
+        }
+    }
+    else if (VTERM_COLOR_IS_RGB(col)) {
+        args[argi++] = CSI_ARG_FLAG_MORE | (fg ? 38 : 48);
+        args[argi++] = CSI_ARG_FLAG_MORE | 2;
+        args[argi++] = CSI_ARG_FLAG_MORE | col->red;
+        args[argi++] = CSI_ARG_FLAG_MORE | col->green;
+        args[argi++] = col->blue;
+    }
+    return argi;
+}
+
+INTERNAL int vterm_state_getpen(VTermState *state, long args[], int argcount UNUSED)
+{
+  int argi = 0;
+
+  if(state->pen.bold)
+    args[argi++] = 1;
+
+  if(state->pen.italic)
+    args[argi++] = 3;
+
+  if(state->pen.underline == VTERM_UNDERLINE_SINGLE)
+    args[argi++] = 4;
+  if(state->pen.underline == VTERM_UNDERLINE_CURLY)
+    args[argi++] = 4 | CSI_ARG_FLAG_MORE, args[argi++] = 3;
+
+  if(state->pen.blink)
+    args[argi++] = 5;
+
+  if(state->pen.reverse)
+    args[argi++] = 7;
+
+  if(state->pen.conceal)
+    args[argi++] = 8;
+
+  if(state->pen.strike)
+    args[argi++] = 9;
+
+  if(state->pen.font)
+    args[argi++] = 10 + state->pen.font;
+
+  if(state->pen.underline == VTERM_UNDERLINE_DOUBLE)
+    args[argi++] = 21;
+
+  argi = vterm_state_getpen_color(&state->pen.fg, argi, args, TRUE);
+
+  argi = vterm_state_getpen_color(&state->pen.bg, argi, args, FALSE);
+
+  if(state->pen.small) {
+    if(state->pen.baseline == VTERM_BASELINE_RAISE)
+      args[argi++] = 73;
+    else if(state->pen.baseline == VTERM_BASELINE_LOWER)
+      args[argi++] = 74;
+  }
+
+  return argi;
+}
+
+int vterm_state_get_penattr(const VTermState *state, VTermAttr attr, VTermValue *val)
+{
+  switch(attr) {
+  case VTERM_ATTR_BOLD:
+    val->boolean = state->pen.bold;
+    return 1;
+
+  case VTERM_ATTR_UNDERLINE:
+    val->number = state->pen.underline;
+    return 1;
+
+  case VTERM_ATTR_ITALIC:
+    val->boolean = state->pen.italic;
+    return 1;
+
+  case VTERM_ATTR_BLINK:
+    val->boolean = state->pen.blink;
+    return 1;
+
+  case VTERM_ATTR_REVERSE:
+    val->boolean = state->pen.reverse;
+    return 1;
+
+  case VTERM_ATTR_CONCEAL:
+    val->boolean = state->pen.conceal;
+    return 1;
+
+  case VTERM_ATTR_STRIKE:
+    val->boolean = state->pen.strike;
+    return 1;
+
+  case VTERM_ATTR_FONT:
+    val->number = state->pen.font;
+    return 1;
+
+  case VTERM_ATTR_FOREGROUND:
+    val->color = state->pen.fg;
+    return 1;
+
+  case VTERM_ATTR_BACKGROUND:
+    val->color = state->pen.bg;
+    return 1;
+
+  case VTERM_ATTR_SMALL:
+    val->boolean = state->pen.small;
+    return 1;
+
+  case VTERM_ATTR_BASELINE:
+    val->number = state->pen.baseline;
+    return 1;
+
+  case VTERM_N_ATTRS:
+    return 0;
+  }
+
+  return 0;
+}
diff --git a/src/libvterm/src/rect.h b/src/libvterm/src/rect.h
new file mode 100644
index 0000000..2114f24
--- /dev/null
+++ b/src/libvterm/src/rect.h
@@ -0,0 +1,56 @@
+/*
+ * Some utility functions on VTermRect structures
+ */
+
+#define STRFrect "(%d,%d-%d,%d)"
+#define ARGSrect(r) (r).start_row, (r).start_col, (r).end_row, (r).end_col
+
+/* Expand dst to contain src as well */
+static void rect_expand(VTermRect *dst, VTermRect *src)
+{
+  if(dst->start_row > src->start_row) dst->start_row = src->start_row;
+  if(dst->start_col > src->start_col) dst->start_col = src->start_col;
+  if(dst->end_row   < src->end_row)   dst->end_row   = src->end_row;
+  if(dst->end_col   < src->end_col)   dst->end_col   = src->end_col;
+}
+
+/* Clip the dst to ensure it does not step outside of bounds */
+static void rect_clip(VTermRect *dst, VTermRect *bounds)
+{
+  if(dst->start_row < bounds->start_row) dst->start_row = bounds->start_row;
+  if(dst->start_col < bounds->start_col) dst->start_col = bounds->start_col;
+  if(dst->end_row   > bounds->end_row)   dst->end_row   = bounds->end_row;
+  if(dst->end_col   > bounds->end_col)   dst->end_col   = bounds->end_col;
+  /* Ensure it doesn't end up negatively-sized */
+  if(dst->end_row < dst->start_row) dst->end_row = dst->start_row;
+  if(dst->end_col < dst->start_col) dst->end_col = dst->start_col;
+}
+
+/* True if the two rectangles are equal */
+static int rect_equal(VTermRect *a, VTermRect *b)
+{
+  return (a->start_row == b->start_row) &&
+         (a->start_col == b->start_col) &&
+         (a->end_row   == b->end_row)   &&
+         (a->end_col   == b->end_col);
+}
+
+/* True if small is contained entirely within big */
+static int rect_contains(VTermRect *big, VTermRect *small)
+{
+  if(small->start_row < big->start_row) return 0;
+  if(small->start_col < big->start_col) return 0;
+  if(small->end_row   > big->end_row)   return 0;
+  if(small->end_col   > big->end_col)   return 0;
+  return 1;
+}
+
+/* True if the rectangles overlap at all */
+static int rect_intersects(VTermRect *a, VTermRect *b)
+{
+  if(a->start_row > b->end_row || b->start_row > a->end_row)
+    return 0;
+  if(a->start_col > b->end_col || b->start_col > a->end_col)
+    return 0;
+  return 1;
+}
diff --git a/src/libvterm/src/screen.c b/src/libvterm/src/screen.c
new file mode 100644
index 0000000..fb1d26e
--- /dev/null
+++ b/src/libvterm/src/screen.c
@@ -0,0 +1,1206 @@
+#include "vterm_internal.h"
+
+// vim: set sw=2 :
+#include <stdio.h>
+#include <string.h>
+
+#include "rect.h"
+#include "utf8.h"
+
+#define UNICODE_SPACE 0x20
+#define UNICODE_LINEFEED 0x0a
+
+#undef DEBUG_REFLOW
+
+/* State of the pen at some moment in time, also used in a cell */
+typedef struct
+{
+  /* After the bitfield */
+  VTermColor   fg, bg;
+
+  unsigned int bold      : 1;
+  unsigned int underline : 2;
+  unsigned int italic    : 1;
+  unsigned int blink     : 1;
+  unsigned int reverse   : 1;
+  unsigned int conceal   : 1;
+  unsigned int strike    : 1;
+  unsigned int font      : 4; /* 0 to 9 */
+  unsigned int small     : 1;
+  unsigned int baseline  : 2;
+
+  /* Extra state storage that isn't strictly pen-related */
+  unsigned int protected_cell : 1;
+  unsigned int dwl            : 1; /* on a DECDWL or DECDHL line */
+  unsigned int dhl            : 2; /* on a DECDHL line (1=top 2=bottom) */
+} ScreenPen;
+
+/* Internal representation of a screen cell */
+typedef struct
+{
+  uint32_t chars[VTERM_MAX_CHARS_PER_CELL];
+  ScreenPen pen;
+} ScreenCell;
+
+struct VTermScreen
+{
+  VTerm *vt;
+  VTermState *state;
+
+  const VTermScreenCallbacks *callbacks;
+  void *cbdata;
+
+  VTermDamageSize damage_merge;
+  /* start_row == -1 => no damage */
+  VTermRect damaged;
+  VTermRect pending_scrollrect;
+  int pending_scroll_downward, pending_scroll_rightward;
+
+  int rows;
+  int cols;
+
+  unsigned int global_reverse : 1;
+  unsigned int reflow : 1;
+
+  /* Primary and Altscreen. buffers[1] is lazily allocated as needed */
+  ScreenCell *buffers[2];
+
+  /* buffer will == buffers[0] or buffers[1], depending on altscreen */
+  ScreenCell *buffer;
+
+  /* buffer for a single screen row used in scrollback storage callbacks */
+  VTermScreenCell *sb_buffer;
+
+  ScreenPen pen;
+};
+
+static void clearcell(const VTermScreen *screen, ScreenCell *cell)
+{
+  cell->chars[0] = 0;
+  cell->pen = screen->pen;
+}
+
+static ScreenCell *getcell(const VTermScreen *screen, int row, int col)
+{
+  if(row < 0 || row >= screen->rows)
+    return NULL;
+  if(col < 0 || col >= screen->cols)
+    return NULL;
+  if (screen->buffer == NULL)
+    return NULL;
+  return screen->buffer + (screen->cols * row) + col;
+}
+
+static ScreenCell *alloc_buffer(VTermScreen *screen, int rows, int cols)
+{
+  ScreenCell *new_buffer = vterm_allocator_malloc(screen->vt, sizeof(ScreenCell) * rows * cols);
+
+  for(int row = 0; row < rows; row++) {
+    for(int col = 0; col < cols; col++) {
+      clearcell(screen, &new_buffer[row * cols + col]);
+    }
+  }
+
+  return new_buffer;
+}
+
+static void damagerect(VTermScreen *screen, VTermRect rect)
+{
+  VTermRect emit;
+
+  switch(screen->damage_merge) {
+  case VTERM_DAMAGE_CELL:
+    /* Always emit damage event */
+    emit = rect;
+    break;
+
+  case VTERM_DAMAGE_ROW:
+    /* Emit damage longer than one row. Try to merge with existing damage in
+     * the same row */
+    if(rect.end_row > rect.start_row + 1) {
+      // Bigger than 1 line - flush existing, emit this
+      vterm_screen_flush_damage(screen);
+      emit = rect;
+    }
+    else if(screen->damaged.start_row == -1) {
+      // None stored yet
+      screen->damaged = rect;
+      return;
+    }
+    else if(rect.start_row == screen->damaged.start_row) {
+      // Merge with the stored line
+      if(screen->damaged.start_col > rect.start_col)
+        screen->damaged.start_col = rect.start_col;
+      if(screen->damaged.end_col < rect.end_col)
+        screen->damaged.end_col = rect.end_col;
+      return;
+    }
+    else {
+      // Emit the currently stored line, store a new one
+      emit = screen->damaged;
+      screen->damaged = rect;
+    }
+    break;
+
+  case VTERM_DAMAGE_SCREEN:
+  case VTERM_DAMAGE_SCROLL:
+    /* Never emit damage event */
+    if(screen->damaged.start_row == -1)
+      screen->damaged = rect;
+    else {
+      rect_expand(&screen->damaged, &rect);
+    }
+    return;
+
+  default:
+    DEBUG_LOG1("TODO: Maybe merge damage for level %d\n", screen->damage_merge);
+    return;
+  }
+
+  if(screen->callbacks && screen->callbacks->damage)
+    (*screen->callbacks->damage)(emit, screen->cbdata);
+}
+
+static void damagescreen(VTermScreen *screen)
+{
+  VTermRect rect = {0,0,0,0};
+  rect.end_row = screen->rows;
+  rect.end_col = screen->cols;
+
+  damagerect(screen, rect);
+}
+
+static int putglyph(VTermGlyphInfo *info, VTermPos pos, void *user)
+{
+  VTermScreen *screen = user;
+  ScreenCell *cell = getcell(screen, pos.row, pos.col);
+
+  if(!cell)
+    return 0;
+
+  int i;
+  for(i = 0; i < VTERM_MAX_CHARS_PER_CELL && info->chars[i]; i++) {
+    cell->chars[i] = info->chars[i];
+    cell->pen = screen->pen;
+  }
+  if(i < VTERM_MAX_CHARS_PER_CELL)
+    cell->chars[i] = 0;
+
+  for(int col = 1; col < info->width; col++)
+  {
+    ScreenCell *onecell = getcell(screen, pos.row, pos.col + col);
+    if (onecell == NULL)
+      break;
+    onecell->chars[0] = (uint32_t)-1;
+  }
+
+  VTermRect rect;
+  rect.start_row = pos.row;
+  rect.end_row   = pos.row+1;
+  rect.start_col = pos.col;
+  rect.end_col   = pos.col+info->width;
+
+  cell->pen.protected_cell = info->protected_cell;
+  cell->pen.dwl            = info->dwl;
+  cell->pen.dhl            = info->dhl;
+
+  damagerect(screen, rect);
+
+  return 1;
+}
+
+static void sb_pushline_from_row(VTermScreen *screen, int row)
+{
+  VTermPos pos;
+  pos.row = row;
+  for(pos.col = 0; pos.col < screen->cols; pos.col++)
+    vterm_screen_get_cell(screen, pos, screen->sb_buffer + pos.col);
+
+  (screen->callbacks->sb_pushline)(screen->cols, screen->sb_buffer, screen->cbdata);
+}
+
+static int moverect_internal(VTermRect dest, VTermRect src, void *user)
+{
+  VTermScreen *screen = user;
+
+  if(screen->callbacks && screen->callbacks->sb_pushline &&
+     dest.start_row == 0 && dest.start_col == 0 &&        // starts top-left corner
+     dest.end_col == screen->cols &&                      // full width
+     screen->buffer == screen->buffers[BUFIDX_PRIMARY]) { // not altscreen
+    for(int row = 0; row < src.start_row; row++)
+      sb_pushline_from_row(screen, row);
+  }
+
+  int cols = src.end_col - src.start_col;
+  int downward = src.start_row - dest.start_row;
+
+  int init_row, test_row, inc_row;
+  if(downward < 0) {
+    init_row = dest.end_row - 1;
+    test_row = dest.start_row - 1;
+    inc_row  = -1;
+  }
+  else {
+    init_row = dest.start_row;
+    test_row = dest.end_row;
+    inc_row  = +1;
+  }
+
+  for(int row = init_row; row != test_row; row += inc_row)
+    memmove(getcell(screen, row, dest.start_col),
+            getcell(screen, row + downward, src.start_col),
+            cols * sizeof(ScreenCell));
+
+  return 1;
+}
+
+static int moverect_user(VTermRect dest, VTermRect src, void *user)
+{
+  VTermScreen *screen = user;
+
+  if(screen->callbacks && screen->callbacks->moverect) {
+    if(screen->damage_merge != VTERM_DAMAGE_SCROLL)
+      // Avoid an infinite loop
+      vterm_screen_flush_damage(screen);
+
+    if((*screen->callbacks->moverect)(dest, src, screen->cbdata))
+      return 1;
+  }
+
+  damagerect(screen, dest);
+
+  return 1;
+}
+
+static int erase_internal(VTermRect rect, int selective, void *user)
+{
+  VTermScreen *screen = user;
+
+  for(int row = rect.start_row; row < screen->state->rows && row < rect.end_row; row++) {
+    const VTermLineInfo *info = vterm_state_get_lineinfo(screen->state, row);
+
+    for(int col = rect.start_col; col < rect.end_col; col++) {
+      ScreenCell *cell = getcell(screen, row, col);
+
+      if (cell == NULL)
+      {
+        DEBUG_LOG2("libvterm: erase_internal() position invalid: %d / %d",
+								     row, col);
+	return 1;
+      }
+      if(selective && cell->pen.protected_cell)
+        continue;
+
+      cell->chars[0] = 0;
+      cell->pen = screen->pen;
+      cell->pen.dwl = info->doublewidth;
+      cell->pen.dhl = info->doubleheight;
+    }
+  }
+
+  return 1;
+}
+
+static int erase_user(VTermRect rect, int selective UNUSED, void *user)
+{
+  VTermScreen *screen = user;
+
+  damagerect(screen, rect);
+
+  return 1;
+}
+
+static int erase(VTermRect rect, int selective, void *user)
+{
+  erase_internal(rect, selective, user);
+  return erase_user(rect, 0, user);
+}
+
+static int scrollrect(VTermRect rect, int downward, int rightward, void *user)
+{
+  VTermScreen *screen = user;
+
+  if(screen->damage_merge != VTERM_DAMAGE_SCROLL) {
+    vterm_scroll_rect(rect, downward, rightward,
+        moverect_internal, erase_internal, screen);
+
+    vterm_screen_flush_damage(screen);
+
+    vterm_scroll_rect(rect, downward, rightward,
+        moverect_user, erase_user, screen);
+
+    return 1;
+  }
+
+  if(screen->damaged.start_row != -1 &&
+     !rect_intersects(&rect, &screen->damaged)) {
+    vterm_screen_flush_damage(screen);
+  }
+
+  if(screen->pending_scrollrect.start_row == -1) {
+    screen->pending_scrollrect = rect;
+    screen->pending_scroll_downward  = downward;
+    screen->pending_scroll_rightward = rightward;
+  }
+  else if(rect_equal(&screen->pending_scrollrect, &rect) &&
+     ((screen->pending_scroll_downward  == 0 && downward  == 0) ||
+      (screen->pending_scroll_rightward == 0 && rightward == 0))) {
+    screen->pending_scroll_downward  += downward;
+    screen->pending_scroll_rightward += rightward;
+  }
+  else {
+    vterm_screen_flush_damage(screen);
+
+    screen->pending_scrollrect = rect;
+    screen->pending_scroll_downward  = downward;
+    screen->pending_scroll_rightward = rightward;
+  }
+
+  vterm_scroll_rect(rect, downward, rightward,
+      moverect_internal, erase_internal, screen);
+
+  if(screen->damaged.start_row == -1)
+    return 1;
+
+  if(rect_contains(&rect, &screen->damaged)) {
+    /* Scroll region entirely contains the damage; just move it */
+    vterm_rect_move(&screen->damaged, -downward, -rightward);
+    rect_clip(&screen->damaged, &rect);
+  }
+  /* There are a number of possible cases here, but lets restrict this to only
+   * the common case where we might actually gain some performance by
+   * optimising it. Namely, a vertical scroll that neatly cuts the damage
+   * region in half.
+   */
+  else if(rect.start_col <= screen->damaged.start_col &&
+          rect.end_col   >= screen->damaged.end_col &&
+          rightward == 0) {
+    if(screen->damaged.start_row >= rect.start_row &&
+       screen->damaged.start_row  < rect.end_row) {
+      screen->damaged.start_row -= downward;
+      if(screen->damaged.start_row < rect.start_row)
+        screen->damaged.start_row = rect.start_row;
+      if(screen->damaged.start_row > rect.end_row)
+        screen->damaged.start_row = rect.end_row;
+    }
+    if(screen->damaged.end_row >= rect.start_row &&
+       screen->damaged.end_row  < rect.end_row) {
+      screen->damaged.end_row -= downward;
+      if(screen->damaged.end_row < rect.start_row)
+        screen->damaged.end_row = rect.start_row;
+      if(screen->damaged.end_row > rect.end_row)
+        screen->damaged.end_row = rect.end_row;
+    }
+  }
+  else {
+    DEBUG_LOG2("TODO: Just flush and redo damaged=" STRFrect " rect=" STRFrect "\n",
+        ARGSrect(screen->damaged), ARGSrect(rect));
+  }
+
+  return 1;
+}
+
+static int movecursor(VTermPos pos, VTermPos oldpos, int visible, void *user)
+{
+  VTermScreen *screen = user;
+
+  if(screen->callbacks && screen->callbacks->movecursor)
+    return (*screen->callbacks->movecursor)(pos, oldpos, visible, screen->cbdata);
+
+  return 0;
+}
+
+static int setpenattr(VTermAttr attr, VTermValue *val, void *user)
+{
+  VTermScreen *screen = user;
+
+  switch(attr) {
+  case VTERM_ATTR_BOLD:
+    screen->pen.bold = val->boolean;
+    return 1;
+  case VTERM_ATTR_UNDERLINE:
+    screen->pen.underline = val->number;
+    return 1;
+  case VTERM_ATTR_ITALIC:
+    screen->pen.italic = val->boolean;
+    return 1;
+  case VTERM_ATTR_BLINK:
+    screen->pen.blink = val->boolean;
+    return 1;
+  case VTERM_ATTR_REVERSE:
+    screen->pen.reverse = val->boolean;
+    return 1;
+  case VTERM_ATTR_CONCEAL:
+    screen->pen.conceal = val->boolean;
+    return 1;
+  case VTERM_ATTR_STRIKE:
+    screen->pen.strike = val->boolean;
+    return 1;
+  case VTERM_ATTR_FONT:
+    screen->pen.font = val->number;
+    return 1;
+  case VTERM_ATTR_FOREGROUND:
+    screen->pen.fg = val->color;
+    return 1;
+  case VTERM_ATTR_BACKGROUND:
+    screen->pen.bg = val->color;
+    return 1;
+  case VTERM_ATTR_SMALL:
+    screen->pen.small = val->boolean;
+    return 1;
+  case VTERM_ATTR_BASELINE:
+    screen->pen.baseline = val->number;
+    return 1;
+
+  case VTERM_N_ATTRS:
+    return 0;
+  }
+
+  return 0;
+}
+
+static int settermprop(VTermProp prop, VTermValue *val, void *user)
+{
+  VTermScreen *screen = user;
+
+  switch(prop) {
+  case VTERM_PROP_ALTSCREEN:
+    if(val->boolean && !screen->buffers[BUFIDX_ALTSCREEN])
+      return 0;
+
+    screen->buffer = val->boolean ? screen->buffers[BUFIDX_ALTSCREEN] : screen->buffers[BUFIDX_PRIMARY];
+    /* only send a damage event on disable; because during enable there's an
+     * erase that sends a damage anyway
+     */
+    if(!val->boolean)
+      damagescreen(screen);
+    break;
+  case VTERM_PROP_REVERSE:
+    screen->global_reverse = val->boolean;
+    damagescreen(screen);
+    break;
+  default:
+    ; /* ignore */
+  }
+
+  if(screen->callbacks && screen->callbacks->settermprop)
+    return (*screen->callbacks->settermprop)(prop, val, screen->cbdata);
+
+  return 1;
+}
+
+static int bell(void *user)
+{
+  VTermScreen *screen = user;
+
+  if(screen->callbacks && screen->callbacks->bell)
+    return (*screen->callbacks->bell)(screen->cbdata);
+
+  return 0;
+}
+
+/* How many cells are non-blank
+ * Returns the position of the first blank cell in the trailing blank end */
+static int line_popcount(ScreenCell *buffer, int row, int rows UNUSED, int cols)
+{
+  int col = cols - 1;
+  while(col >= 0 && buffer[row * cols + col].chars[0] == 0)
+    col--;
+  return col + 1;
+}
+
+#define REFLOW (screen->reflow)
+
+static void resize_buffer(VTermScreen *screen, int bufidx, int new_rows, int new_cols, int active, VTermStateFields *statefields)
+{
+  int old_rows = screen->rows;
+  int old_cols = screen->cols;
+
+  ScreenCell *old_buffer = screen->buffers[bufidx];
+  VTermLineInfo *old_lineinfo = statefields->lineinfos[bufidx];
+
+  ScreenCell *new_buffer = vterm_allocator_malloc(screen->vt, sizeof(ScreenCell) * new_rows * new_cols);
+  VTermLineInfo *new_lineinfo = vterm_allocator_malloc(screen->vt, sizeof(new_lineinfo[0]) * new_rows);
+
+  // Find the final row of old buffer content
+  int old_row = old_rows - 1;
+  int new_row = new_rows - 1;
+
+  VTermPos old_cursor = statefields->pos;
+  VTermPos new_cursor = { -1, -1 };
+
+#ifdef DEBUG_REFLOW
+  fprintf(stderr, "Resizing from %dx%d to %dx%d; cursor was at (%d,%d)\n",
+      old_cols, old_rows, new_cols, new_rows, old_cursor.col, old_cursor.row);
+#endif
+
+  /* Keep track of the final row that is knonw to be blank, so we know what
+   * spare space we have for scrolling into
+   */
+  int final_blank_row = new_rows;
+
+  while(old_row >= 0) {
+    int old_row_end = old_row;
+    /* TODO: Stop if dwl or dhl */
+    while(REFLOW && old_lineinfo && old_row >= 0 && old_lineinfo[old_row].continuation)
+      old_row--;
+    int old_row_start = old_row;
+
+    int width = 0;
+    for(int row = old_row_start; row <= old_row_end; row++) {
+      if(REFLOW && row < (old_rows - 1) && old_lineinfo[row + 1].continuation)
+        width += old_cols;
+      else
+        width += line_popcount(old_buffer, row, old_rows, old_cols);
+    }
+
+    if(final_blank_row == (new_row + 1) && width == 0)
+      final_blank_row = new_row;
+
+    int new_height = REFLOW
+      ? width ? (width + new_cols - 1) / new_cols : 1
+      : 1;
+
+    int new_row_end = new_row;
+    int new_row_start = new_row - new_height + 1;
+
+    old_row = old_row_start;
+    int old_col = 0;
+
+    int spare_rows = new_rows - final_blank_row;
+
+    if(new_row_start < 0 && /* we'd fall off the top */
+        spare_rows >= 0 && /* we actually have spare rows */
+        (!active || new_cursor.row == -1 || (new_cursor.row - new_row_start) < new_rows))
+    {
+      /* Attempt to scroll content down into the blank rows at the bottom to
+       * make it fit
+       */
+      int downwards = -new_row_start;
+      if(downwards > spare_rows)
+        downwards = spare_rows;
+      int rowcount = new_rows - downwards;
+
+#ifdef DEBUG_REFLOW
+      fprintf(stderr, "  scroll %d rows +%d downwards\n", rowcount, downwards);
+#endif
+
+      memmove(&new_buffer[downwards * new_cols], &new_buffer[0],   rowcount * new_cols * sizeof(ScreenCell));
+      memmove(&new_lineinfo[downwards],          &new_lineinfo[0], rowcount            * sizeof(new_lineinfo[0]));
+
+      new_row += downwards;
+      new_row_start += downwards;
+      new_row_end += downwards;
+
+      if(new_cursor.row >= 0)
+        new_cursor.row += downwards;
+
+      final_blank_row += downwards;
+    }
+
+#ifdef DEBUG_REFLOW
+    fprintf(stderr, "  rows [%d..%d] <- [%d..%d] width=%d\n",
+        new_row_start, new_row_end, old_row_start, old_row_end, width);
+#endif
+
+    if(new_row_start < 0)
+      break;
+
+    for(new_row = new_row_start, old_row = old_row_start; new_row <= new_row_end; new_row++) {
+      int count = width >= new_cols ? new_cols : width;
+      width -= count;
+
+      int new_col = 0;
+
+      while(count) {
+        /* TODO: This could surely be done a lot faster by memcpy()'ing the entire range */
+        new_buffer[new_row * new_cols + new_col] = old_buffer[old_row * old_cols + old_col];
+
+        if(old_cursor.row == old_row && old_cursor.col == old_col)
+          new_cursor.row = new_row, new_cursor.col = new_col;
+
+        old_col++;
+        if(old_col == old_cols) {
+          old_row++;
+
+          if(!REFLOW) {
+            new_col++;
+            break;
+          }
+          old_col = 0;
+        }
+
+        new_col++;
+        count--;
+      }
+
+      if(old_cursor.row == old_row && old_cursor.col >= old_col) {
+        new_cursor.row = new_row, new_cursor.col = (old_cursor.col - old_col + new_col);
+        if(new_cursor.col >= new_cols)
+          new_cursor.col = new_cols-1;
+      }
+
+      while(new_col < new_cols) {
+        clearcell(screen, &new_buffer[new_row * new_cols + new_col]);
+        new_col++;
+      }
+
+      new_lineinfo[new_row].continuation = (new_row > new_row_start);
+    }
+
+    old_row = old_row_start - 1;
+    new_row = new_row_start - 1;
+  }
+
+  if(old_cursor.row <= old_row) {
+    /* cursor would have moved entirely off the top of the screen; lets just
+     * bring it within range */
+    new_cursor.row = 0, new_cursor.col = old_cursor.col;
+    if(new_cursor.col >= new_cols)
+      new_cursor.col = new_cols-1;
+  }
+
+  /* We really expect the cursor position to be set by now */
+  /* Unfortunately we do get here when "new_rows" is one.  We don't want
+   * to crash, so until the above code is fixed let's just set the cursor. */
+  if(active && (new_cursor.row == -1 || new_cursor.col == -1)) {
+    /* fprintf(stderr, "screen_resize failed to update cursor position\n");
+     * abort(); */
+    if (new_cursor.row < 0)
+      new_cursor.row = 0;
+    if (new_cursor.col < 0)
+      new_cursor.col = 0;
+  }
+
+  if(old_row >= 0 && bufidx == BUFIDX_PRIMARY) {
+    /* Push spare lines to scrollback buffer */
+    for(int row = 0; row <= old_row; row++)
+      sb_pushline_from_row(screen, row);
+    if(active)
+      statefields->pos.row -= (old_row + 1);
+  }
+  if(new_row >= 0 && bufidx == BUFIDX_PRIMARY &&
+      screen->callbacks && screen->callbacks->sb_popline) {
+    /* Try to backfill rows by popping scrollback buffer */
+    while(new_row >= 0) {
+      VTermPos pos;
+      if(!(screen->callbacks->sb_popline(old_cols, screen->sb_buffer, screen->cbdata)))
+        break;
+
+      pos.row = new_row;
+      for(pos.col = 0; pos.col < old_cols && pos.col < new_cols; pos.col += screen->sb_buffer[pos.col].width) {
+        VTermScreenCell *src = &screen->sb_buffer[pos.col];
+        ScreenCell *dst = &new_buffer[pos.row * new_cols + pos.col];
+
+        for(int i = 0; i < VTERM_MAX_CHARS_PER_CELL; i++) {
+          dst->chars[i] = src->chars[i];
+          if(!src->chars[i])
+            break;
+        }
+
+        dst->pen.bold      = src->attrs.bold;
+        dst->pen.underline = src->attrs.underline;
+        dst->pen.italic    = src->attrs.italic;
+        dst->pen.blink     = src->attrs.blink;
+        dst->pen.reverse   = src->attrs.reverse ^ screen->global_reverse;
+        dst->pen.conceal   = src->attrs.conceal;
+        dst->pen.strike    = src->attrs.strike;
+        dst->pen.font      = src->attrs.font;
+        dst->pen.small     = src->attrs.small;
+        dst->pen.baseline  = src->attrs.baseline;
+
+        dst->pen.fg = src->fg;
+        dst->pen.bg = src->bg;
+
+        if(src->width == 2 && pos.col < (new_cols-1))
+          (dst + 1)->chars[0] = (uint32_t) -1;
+      }
+      for( ; pos.col < new_cols; pos.col++)
+        clearcell(screen, &new_buffer[pos.row * new_cols + pos.col]);
+      new_row--;
+
+      if(active)
+        statefields->pos.row++;
+    }
+  }
+  if(new_row >= 0) {
+    /* Scroll new rows back up to the top and fill in blanks at the bottom */
+    int moverows = new_rows - new_row - 1;
+    memmove(&new_buffer[0], &new_buffer[(new_row + 1) * new_cols], moverows * new_cols * sizeof(ScreenCell));
+    memmove(&new_lineinfo[0], &new_lineinfo[new_row + 1], moverows * sizeof(new_lineinfo[0]));
+
+    new_cursor.row -= (new_row + 1);
+
+    for(new_row = moverows; new_row < new_rows; new_row++) {
+      for(int col = 0; col < new_cols; col++)
+        clearcell(screen, &new_buffer[new_row * new_cols + col]);
+      new_lineinfo[new_row] = (VTermLineInfo){ 0 };
+    }
+  }
+
+  vterm_allocator_free(screen->vt, old_buffer);
+  screen->buffers[bufidx] = new_buffer;
+
+  vterm_allocator_free(screen->vt, old_lineinfo);
+  statefields->lineinfos[bufidx] = new_lineinfo;
+
+  if(active)
+    statefields->pos = new_cursor;
+
+  return;
+}
+
+static int resize(int new_rows, int new_cols, VTermStateFields *fields, void *user)
+{
+  VTermScreen *screen = user;
+
+  int altscreen_active = (screen->buffers[BUFIDX_ALTSCREEN] && screen->buffer == screen->buffers[BUFIDX_ALTSCREEN]);
+
+  int old_rows = screen->rows;
+  int old_cols = screen->cols;
+
+  if(new_cols > old_cols) {
+    /* Ensure that ->sb_buffer is large enough for a new or and old row */
+    if(screen->sb_buffer)
+      vterm_allocator_free(screen->vt, screen->sb_buffer);
+
+    screen->sb_buffer = vterm_allocator_malloc(screen->vt, sizeof(VTermScreenCell) * new_cols);
+  }
+
+  resize_buffer(screen, 0, new_rows, new_cols, !altscreen_active, fields);
+  if(screen->buffers[BUFIDX_ALTSCREEN])
+    resize_buffer(screen, 1, new_rows, new_cols, altscreen_active, fields);
+  else if(new_rows != old_rows) {
+    /* We don't need a full resize of the altscreen because it isn't enabled
+     * but we should at least keep the lineinfo the right size */
+    vterm_allocator_free(screen->vt, fields->lineinfos[BUFIDX_ALTSCREEN]);
+
+    VTermLineInfo *new_lineinfo = vterm_allocator_malloc(screen->vt, sizeof(new_lineinfo[0]) * new_rows);
+    for(int row = 0; row < new_rows; row++)
+      new_lineinfo[row] = (VTermLineInfo){ 0 };
+
+    fields->lineinfos[BUFIDX_ALTSCREEN] = new_lineinfo;
+  }
+
+  screen->buffer = altscreen_active ? screen->buffers[BUFIDX_ALTSCREEN] : screen->buffers[BUFIDX_PRIMARY];
+
+  screen->rows = new_rows;
+  screen->cols = new_cols;
+
+  if(new_cols <= old_cols) {
+    if(screen->sb_buffer)
+      vterm_allocator_free(screen->vt, screen->sb_buffer);
+
+    screen->sb_buffer = vterm_allocator_malloc(screen->vt, sizeof(VTermScreenCell) * new_cols);
+  }
+
+  /* TODO: Maaaaybe we can optimise this if there's no reflow happening */
+  damagescreen(screen);
+
+  if(screen->callbacks && screen->callbacks->resize)
+    return (*screen->callbacks->resize)(new_rows, new_cols, screen->cbdata);
+
+  return 1;
+}
+
+static int setlineinfo(int row, const VTermLineInfo *newinfo, const VTermLineInfo *oldinfo, void *user)
+{
+  VTermScreen *screen = user;
+
+  if(newinfo->doublewidth != oldinfo->doublewidth ||
+     newinfo->doubleheight != oldinfo->doubleheight) {
+    for(int col = 0; col < screen->cols; col++) {
+      ScreenCell *cell = getcell(screen, row, col);
+      if (cell == NULL)
+      {
+        DEBUG_LOG2("libvterm: setlineinfo() position invalid: %d / %d",
+								     row, col);
+	return 1;
+      }
+      cell->pen.dwl = newinfo->doublewidth;
+      cell->pen.dhl = newinfo->doubleheight;
+    }
+
+    VTermRect rect;
+    rect.start_row = row;
+    rect.end_row   = row + 1;
+    rect.start_col = 0;
+    rect.end_col   = newinfo->doublewidth ? screen->cols / 2 : screen->cols;
+    damagerect(screen, rect);
+
+    if(newinfo->doublewidth) {
+      rect.start_col = screen->cols / 2;
+      rect.end_col   = screen->cols;
+
+      erase_internal(rect, 0, user);
+    }
+  }
+
+  return 1;
+}
+
+static int sb_clear(void *user) {
+  VTermScreen *screen = user;
+
+  if(screen->callbacks && screen->callbacks->sb_clear)
+    if((*screen->callbacks->sb_clear)(screen->cbdata))
+      return 1;
+
+  return 0;
+}
+
+static VTermStateCallbacks state_cbs = {
+  &putglyph, // putglyph
+  &movecursor, // movecursor
+  &scrollrect, // scrollrect
+  NULL, // moverect
+  &erase, // erase
+  NULL, // initpen
+  &setpenattr, // setpenattr
+  &settermprop, // settermprop
+  &bell, // bell
+  &resize, // resize
+  &setlineinfo, // setlineinfo
+  &sb_clear, //sb_clear
+};
+
+/*
+ * Allocate a new screen and return it.
+ * Return NULL when out of memory.
+ */
+static VTermScreen *screen_new(VTerm *vt)
+{
+  VTermState *state = vterm_obtain_state(vt);
+  if(!state)
+    return NULL;
+
+  VTermScreen *screen = vterm_allocator_malloc(vt, sizeof(VTermScreen));
+  if (screen == NULL)
+    return NULL;
+  int rows, cols;
+
+  vterm_get_size(vt, &rows, &cols);
+
+  screen->vt = vt;
+  screen->state = state;
+
+  screen->damage_merge = VTERM_DAMAGE_CELL;
+  screen->damaged.start_row = -1;
+  screen->pending_scrollrect.start_row = -1;
+
+  screen->rows = rows;
+  screen->cols = cols;
+
+  screen->global_reverse = FALSE;
+  screen->reflow = FALSE;
+
+  screen->callbacks = NULL;
+  screen->cbdata    = NULL;
+
+  screen->buffers[BUFIDX_PRIMARY] = alloc_buffer(screen, rows, cols);
+
+  screen->buffer = screen->buffers[BUFIDX_PRIMARY];
+
+  screen->sb_buffer = vterm_allocator_malloc(screen->vt, sizeof(VTermScreenCell) * cols);
+  if (screen->buffer == NULL || screen->sb_buffer == NULL)
+  {
+    vterm_screen_free(screen);
+    return NULL;
+  }
+
+  vterm_state_set_callbacks(screen->state, &state_cbs, screen);
+
+  return screen;
+}
+
+INTERNAL void vterm_screen_free(VTermScreen *screen)
+{
+  vterm_allocator_free(screen->vt, screen->buffers[BUFIDX_PRIMARY]);
+  if(screen->buffers[BUFIDX_ALTSCREEN])
+    vterm_allocator_free(screen->vt, screen->buffers[BUFIDX_ALTSCREEN]);
+
+  vterm_allocator_free(screen->vt, screen->sb_buffer);
+
+  vterm_allocator_free(screen->vt, screen);
+}
+
+void vterm_screen_reset(VTermScreen *screen, int hard)
+{
+  screen->damaged.start_row = -1;
+  screen->pending_scrollrect.start_row = -1;
+  vterm_state_reset(screen->state, hard);
+  vterm_screen_flush_damage(screen);
+}
+
+static size_t _get_chars(const VTermScreen *screen, const int utf8, void *buffer, size_t len, const VTermRect rect)
+{
+  size_t outpos = 0;
+  int padding = 0;
+
+#define PUT(c)                                             \
+  if(utf8) {                                               \
+    size_t thislen = utf8_seqlen(c);                       \
+    if(buffer && outpos + thislen <= len)                  \
+      outpos += fill_utf8((c), (char *)buffer + outpos);   \
+    else                                                   \
+      outpos += thislen;                                   \
+  }                                                        \
+  else {                                                   \
+    if(buffer && outpos + 1 <= len)                        \
+      ((uint32_t*)buffer)[outpos++] = (c);                 \
+    else                                                   \
+      outpos++;                                            \
+  }
+
+  for(int row = rect.start_row; row < rect.end_row; row++) {
+    for(int col = rect.start_col; col < rect.end_col; col++) {
+      ScreenCell *cell = getcell(screen, row, col);
+
+      if (cell == NULL)
+      {
+        DEBUG_LOG2("libvterm: _get_chars() position invalid: %d / %d",
+								     row, col);
+	return 1;
+      }
+      if(cell->chars[0] == 0)
+        // Erased cell, might need a space
+        padding++;
+      else if(cell->chars[0] == (uint32_t)-1)
+        // Gap behind a double-width char, do nothing
+        ;
+      else {
+        while(padding) {
+          PUT(UNICODE_SPACE);
+          padding--;
+        }
+        for(int i = 0; i < VTERM_MAX_CHARS_PER_CELL && cell->chars[i]; i++) {
+          PUT(cell->chars[i]);
+        }
+      }
+    }
+
+    if(row < rect.end_row - 1) {
+      PUT(UNICODE_LINEFEED);
+      padding = 0;
+    }
+  }
+
+  return outpos;
+}
+
+size_t vterm_screen_get_chars(const VTermScreen *screen, uint32_t *chars, size_t len, const VTermRect rect)
+{
+  return _get_chars(screen, 0, chars, len, rect);
+}
+
+size_t vterm_screen_get_text(const VTermScreen *screen, char *str, size_t len, const VTermRect rect)
+{
+  return _get_chars(screen, 1, str, len, rect);
+}
+
+/* Copy internal to external representation of a screen cell */
+int vterm_screen_get_cell(const VTermScreen *screen, VTermPos pos, VTermScreenCell *cell)
+{
+  ScreenCell *intcell = getcell(screen, pos.row, pos.col);
+
+  if(!intcell)
+    return 0;
+
+  for(int i = 0; i < VTERM_MAX_CHARS_PER_CELL; i++) {
+    cell->chars[i] = intcell->chars[i];
+    if(!intcell->chars[i])
+      break;
+  }
+
+  cell->attrs.bold      = intcell->pen.bold;
+  cell->attrs.underline = intcell->pen.underline;
+  cell->attrs.italic    = intcell->pen.italic;
+  cell->attrs.blink     = intcell->pen.blink;
+  cell->attrs.reverse   = intcell->pen.reverse ^ screen->global_reverse;
+  cell->attrs.conceal   = intcell->pen.conceal;
+  cell->attrs.strike    = intcell->pen.strike;
+  cell->attrs.font      = intcell->pen.font;
+  cell->attrs.small     = intcell->pen.small;
+  cell->attrs.baseline  = intcell->pen.baseline;
+
+  cell->attrs.dwl = intcell->pen.dwl;
+  cell->attrs.dhl = intcell->pen.dhl;
+
+  cell->fg = intcell->pen.fg;
+  cell->bg = intcell->pen.bg;
+
+  if(vterm_get_special_pty_type() == 2) {
+    // Get correct cell width from cell information contained in line buffer
+    if(pos.col < (screen->cols - 1) &&
+       getcell(screen, pos.row, pos.col + 1)->chars[0] == (uint32_t)-1) {
+      if(getcell(screen, pos.row, pos.col)->chars[0] == 0x20) {
+        getcell(screen, pos.row, pos.col)->chars[0] = 0;
+        cell->width = 2;
+      } else if(getcell(screen, pos.row, pos.col)->chars[0] == 0) {
+        getcell(screen, pos.row, pos.col + 1)->chars[0] = 0;
+        cell->width = 1;
+      } else {
+        cell->width = 2;
+      }
+    } else
+      cell->width = 1;
+  } else {
+    if(pos.col < (screen->cols - 1) &&
+       getcell(screen, pos.row, pos.col + 1)->chars[0] == (uint32_t)-1)
+      cell->width = 2;
+    else
+      cell->width = 1;
+  }
+
+  return 1;
+}
+
+int vterm_screen_is_eol(const VTermScreen *screen, VTermPos pos)
+{
+  /* This cell is EOL if this and every cell to the right is black */
+  for(; pos.col < screen->cols; pos.col++) {
+    ScreenCell *cell = getcell(screen, pos.row, pos.col);
+    if(cell->chars[0] != 0)
+      return 0;
+  }
+
+  return 1;
+}
+
+VTermScreen *vterm_obtain_screen(VTerm *vt)
+{
+  if(vt->screen)
+    return vt->screen;
+
+  vt->screen = screen_new(vt);
+  return vt->screen;
+}
+
+void vterm_screen_enable_reflow(VTermScreen *screen, int reflow)
+{
+  screen->reflow = reflow;
+}
+
+// Removed, causes a compiler warning and isn't used
+// #undef vterm_screen_set_reflow
+// void vterm_screen_set_reflow(VTermScreen *screen, int reflow)
+// {
+//   vterm_screen_enable_reflow(screen, reflow);
+// }
+
+void vterm_screen_enable_altscreen(VTermScreen *screen, int altscreen)
+{
+  if(!screen->buffers[BUFIDX_ALTSCREEN] && altscreen) {
+    int rows, cols;
+    vterm_get_size(screen->vt, &rows, &cols);
+
+    screen->buffers[BUFIDX_ALTSCREEN] = alloc_buffer(screen, rows, cols);
+  }
+}
+
+void vterm_screen_set_callbacks(VTermScreen *screen, const VTermScreenCallbacks *callbacks, void *user)
+{
+  screen->callbacks = callbacks;
+  screen->cbdata = user;
+}
+
+void *vterm_screen_get_cbdata(VTermScreen *screen)
+{
+  return screen->cbdata;
+}
+
+void vterm_screen_set_unrecognised_fallbacks(VTermScreen *screen, const VTermStateFallbacks *fallbacks, void *user)
+{
+  vterm_state_set_unrecognised_fallbacks(screen->state, fallbacks, user);
+}
+
+void *vterm_screen_get_unrecognised_fbdata(VTermScreen *screen)
+{
+  return vterm_state_get_unrecognised_fbdata(screen->state);
+}
+
+void vterm_screen_flush_damage(VTermScreen *screen)
+{
+  if(screen->pending_scrollrect.start_row != -1) {
+    vterm_scroll_rect(screen->pending_scrollrect, screen->pending_scroll_downward, screen->pending_scroll_rightward,
+        moverect_user, erase_user, screen);
+
+    screen->pending_scrollrect.start_row = -1;
+  }
+
+  if(screen->damaged.start_row != -1) {
+    if(screen->callbacks && screen->callbacks->damage)
+      (*screen->callbacks->damage)(screen->damaged, screen->cbdata);
+
+    screen->damaged.start_row = -1;
+  }
+}
+
+void vterm_screen_set_damage_merge(VTermScreen *screen, VTermDamageSize size)
+{
+  vterm_screen_flush_damage(screen);
+  screen->damage_merge = size;
+}
+
+static int attrs_differ(VTermAttrMask attrs, ScreenCell *a, ScreenCell *b)
+{
+  if((attrs & VTERM_ATTR_BOLD_MASK)       && (a->pen.bold != b->pen.bold))
+    return 1;
+  if((attrs & VTERM_ATTR_UNDERLINE_MASK)  && (a->pen.underline != b->pen.underline))
+    return 1;
+  if((attrs & VTERM_ATTR_ITALIC_MASK)     && (a->pen.italic != b->pen.italic))
+    return 1;
+  if((attrs & VTERM_ATTR_BLINK_MASK)      && (a->pen.blink != b->pen.blink))
+    return 1;
+  if((attrs & VTERM_ATTR_REVERSE_MASK)    && (a->pen.reverse != b->pen.reverse))
+    return 1;
+  if((attrs & VTERM_ATTR_CONCEAL_MASK)    && (a->pen.conceal != b->pen.conceal))
+    return 1;
+  if((attrs & VTERM_ATTR_STRIKE_MASK)     && (a->pen.strike != b->pen.strike))
+    return 1;
+  if((attrs & VTERM_ATTR_FONT_MASK)       && (a->pen.font != b->pen.font))
+    return 1;
+  if((attrs & VTERM_ATTR_FOREGROUND_MASK) && !vterm_color_is_equal(&a->pen.fg, &b->pen.fg))
+    return 1;
+  if((attrs & VTERM_ATTR_BACKGROUND_MASK) && !vterm_color_is_equal(&a->pen.bg, &b->pen.bg))
+    return 1;
+  if((attrs & VTERM_ATTR_SMALL_MASK)    && (a->pen.small != b->pen.small))
+    return 1;
+  if((attrs & VTERM_ATTR_BASELINE_MASK)    && (a->pen.baseline != b->pen.baseline))
+    return 1;
+
+  return 0;
+}
+
+int vterm_screen_get_attrs_extent(const VTermScreen *screen, VTermRect *extent, VTermPos pos, VTermAttrMask attrs)
+{
+  ScreenCell *target = getcell(screen, pos.row, pos.col);
+
+  // TODO: bounds check
+  extent->start_row = pos.row;
+  extent->end_row   = pos.row + 1;
+
+  if(extent->start_col < 0)
+    extent->start_col = 0;
+  if(extent->end_col < 0)
+    extent->end_col = screen->cols;
+
+  int col;
+
+  for(col = pos.col - 1; col >= extent->start_col; col--)
+    if(attrs_differ(attrs, target, getcell(screen, pos.row, col)))
+      break;
+  extent->start_col = col + 1;
+
+  for(col = pos.col + 1; col < extent->end_col; col++)
+    if(attrs_differ(attrs, target, getcell(screen, pos.row, col)))
+      break;
+  extent->end_col = col - 1;
+
+  return 1;
+}
+
+void vterm_screen_convert_color_to_rgb(const VTermScreen *screen, VTermColor *col)
+{
+  vterm_state_convert_color_to_rgb(screen->state, col);
+}
diff --git a/src/libvterm/src/state.c b/src/libvterm/src/state.c
new file mode 100644
index 0000000..ee44824
--- /dev/null
+++ b/src/libvterm/src/state.c
@@ -0,0 +1,2473 @@
+#include "vterm_internal.h"
+
+#include <stdio.h>
+#include <string.h>
+
+#define strneq(a,b,n) (strncmp(a,b,n)==0)
+
+#if defined(DEBUG) && DEBUG > 1
+# define DEBUG_GLYPH_COMBINE
+#endif
+
+static int on_resize(int rows, int cols, void *user);
+
+/* Some convenient wrappers to make callback functions easier */
+
+static void putglyph(VTermState *state, const uint32_t chars[], int width, VTermPos pos)
+{
+  VTermGlyphInfo info;
+
+  info.chars = chars;
+  info.width = width;
+  info.protected_cell = state->protected_cell;
+  info.dwl = state->lineinfo[pos.row].doublewidth;
+  info.dhl = state->lineinfo[pos.row].doubleheight;
+
+  if(state->callbacks && state->callbacks->putglyph)
+    if((*state->callbacks->putglyph)(&info, pos, state->cbdata))
+      return;
+
+  DEBUG_LOG3("libvterm: Unhandled putglyph U+%04x at (%d,%d)\n", chars[0], pos.col, pos.row);
+}
+
+static void updatecursor(VTermState *state, VTermPos *oldpos, int cancel_phantom)
+{
+  if(state->pos.col == oldpos->col && state->pos.row == oldpos->row)
+    return;
+
+  if(cancel_phantom)
+    state->at_phantom = 0;
+
+  if(state->callbacks && state->callbacks->movecursor)
+    if((*state->callbacks->movecursor)(state->pos, *oldpos, state->mode.cursor_visible, state->cbdata))
+      return;
+}
+
+static void erase(VTermState *state, VTermRect rect, int selective)
+{
+  if(rect.end_col == state->cols) {
+    int row;
+    /* If we're erasing the final cells of any lines, cancel the continuation
+     * marker on the subsequent line
+     */
+    for(row = rect.start_row + 1; row < rect.end_row + 1 && row < state->rows; row++)
+      state->lineinfo[row].continuation = 0;
+  }
+
+  if(state->callbacks && state->callbacks->erase)
+    if((*state->callbacks->erase)(rect, selective, state->cbdata))
+      return;
+}
+
+static VTermState *vterm_state_new(VTerm *vt)
+{
+  VTermState *state = vterm_allocator_malloc(vt, sizeof(VTermState));
+
+  if (state == NULL)
+    return NULL;
+  state->vt = vt;
+
+  state->rows = vt->rows;
+  state->cols = vt->cols;
+
+  state->mouse_col     = 0;
+  state->mouse_row     = 0;
+  state->mouse_buttons = 0;
+
+  state->mouse_protocol = MOUSE_X10;
+
+  state->callbacks = NULL;
+  state->cbdata    = NULL;
+
+  state->selection.callbacks = NULL;
+  state->selection.user      = NULL;
+  state->selection.buffer    = NULL;
+
+  vterm_state_newpen(state);
+
+  state->bold_is_highbright = 0;
+
+  state->combine_chars_size = 16;
+  state->combine_chars = vterm_allocator_malloc(state->vt, state->combine_chars_size * sizeof(state->combine_chars[0]));
+
+  state->tabstops = vterm_allocator_malloc(state->vt, (state->cols + 7) / 8);
+
+  state->lineinfos[BUFIDX_PRIMARY]   = vterm_allocator_malloc(state->vt, state->rows * sizeof(VTermLineInfo));
+  /* TODO: Make an 'enable' function */
+  state->lineinfos[BUFIDX_ALTSCREEN] = vterm_allocator_malloc(state->vt, state->rows * sizeof(VTermLineInfo));
+  state->lineinfo = state->lineinfos[BUFIDX_PRIMARY];
+
+  state->encoding_utf8.enc = vterm_lookup_encoding(ENC_UTF8, 'u');
+  if(state->encoding_utf8.enc->init)
+    (*state->encoding_utf8.enc->init)(state->encoding_utf8.enc, state->encoding_utf8.data);
+
+  return state;
+}
+
+INTERNAL void vterm_state_free(VTermState *state)
+{
+  vterm_allocator_free(state->vt, state->tabstops);
+  vterm_allocator_free(state->vt, state->lineinfos[BUFIDX_PRIMARY]);
+  if(state->lineinfos[BUFIDX_ALTSCREEN])
+    vterm_allocator_free(state->vt, state->lineinfos[BUFIDX_ALTSCREEN]);
+  vterm_allocator_free(state->vt, state->combine_chars);
+  vterm_allocator_free(state->vt, state);
+}
+
+static void scroll(VTermState *state, VTermRect rect, int downward, int rightward)
+{
+  int rows;
+  int cols;
+  if(!downward && !rightward)
+    return;
+
+  rows = rect.end_row - rect.start_row;
+  if(downward > rows)
+    downward = rows;
+  else if(downward < -rows)
+    downward = -rows;
+
+  cols = rect.end_col - rect.start_col;
+  if(rightward > cols)
+    rightward = cols;
+  else if(rightward < -cols)
+    rightward = -cols;
+
+  // Update lineinfo if full line
+  if(rect.start_col == 0 && rect.end_col == state->cols && rightward == 0) {
+    int height = rect.end_row - rect.start_row - abs(downward);
+    int row;
+    VTermLineInfo zeroLineInfo = {0x0};
+
+    if(downward > 0) {
+      memmove(state->lineinfo + rect.start_row,
+              state->lineinfo + rect.start_row + downward,
+              height * sizeof(state->lineinfo[0]));
+      for(row = rect.end_row - downward; row < rect.end_row; row++)
+        state->lineinfo[row] = zeroLineInfo;
+    }
+    else {
+      memmove(state->lineinfo + rect.start_row - downward,
+              state->lineinfo + rect.start_row,
+              height * sizeof(state->lineinfo[0]));
+      for(row = rect.start_row; row < rect.start_row - downward; row++)
+        state->lineinfo[row] = zeroLineInfo;
+    }
+  }
+
+  if(state->callbacks && state->callbacks->scrollrect)
+    if((*state->callbacks->scrollrect)(rect, downward, rightward, state->cbdata))
+      return;
+
+  if(state->callbacks)
+    vterm_scroll_rect(rect, downward, rightward,
+        state->callbacks->moverect, state->callbacks->erase, state->cbdata);
+}
+
+static void linefeed(VTermState *state)
+{
+  if(state->pos.row == SCROLLREGION_BOTTOM(state) - 1) {
+    VTermRect rect;
+    rect.start_row = state->scrollregion_top;
+    rect.end_row   = SCROLLREGION_BOTTOM(state);
+    rect.start_col = SCROLLREGION_LEFT(state);
+    rect.end_col   = SCROLLREGION_RIGHT(state);
+
+    scroll(state, rect, 1, 0);
+  }
+  else if(state->pos.row < state->rows-1)
+    state->pos.row++;
+}
+
+static void grow_combine_buffer(VTermState *state)
+{
+  size_t    new_size = state->combine_chars_size * 2;
+  uint32_t *new_chars = vterm_allocator_malloc(state->vt, new_size * sizeof(new_chars[0]));
+
+  memcpy(new_chars, state->combine_chars, state->combine_chars_size * sizeof(new_chars[0]));
+
+  vterm_allocator_free(state->vt, state->combine_chars);
+
+  state->combine_chars = new_chars;
+  state->combine_chars_size = new_size;
+}
+
+static void set_col_tabstop(VTermState *state, int col)
+{
+  unsigned char mask = 1 << (col & 7);
+  state->tabstops[col >> 3] |= mask;
+}
+
+static void clear_col_tabstop(VTermState *state, int col)
+{
+  unsigned char mask = 1 << (col & 7);
+  state->tabstops[col >> 3] &= ~mask;
+}
+
+static int is_col_tabstop(VTermState *state, int col)
+{
+  unsigned char mask = 1 << (col & 7);
+  return state->tabstops[col >> 3] & mask;
+}
+
+static int is_cursor_in_scrollregion(const VTermState *state)
+{
+  if(state->pos.row < state->scrollregion_top ||
+     state->pos.row >= SCROLLREGION_BOTTOM(state))
+    return 0;
+  if(state->pos.col < SCROLLREGION_LEFT(state) ||
+     state->pos.col >= SCROLLREGION_RIGHT(state))
+    return 0;
+
+  return 1;
+}
+
+static void tab(VTermState *state, int count, int direction)
+{
+  while(count > 0) {
+    if(direction > 0) {
+      if(state->pos.col >= THISROWWIDTH(state)-1)
+        return;
+
+      state->pos.col++;
+    }
+    else if(direction < 0) {
+      if(state->pos.col < 1)
+        return;
+
+      state->pos.col--;
+    }
+
+    if(is_col_tabstop(state, state->pos.col))
+      count--;
+  }
+}
+
+#define NO_FORCE 0
+#define FORCE    1
+
+#define DWL_OFF 0
+#define DWL_ON  1
+
+#define DHL_OFF    0
+#define DHL_TOP    1
+#define DHL_BOTTOM 2
+
+static void set_lineinfo(VTermState *state, int row, int force, int dwl, int dhl)
+{
+  VTermLineInfo info = state->lineinfo[row];
+
+  if(dwl == DWL_OFF)
+    info.doublewidth = DWL_OFF;
+  else if(dwl == DWL_ON)
+    info.doublewidth = DWL_ON;
+  // else -1 to ignore
+
+  if(dhl == DHL_OFF)
+    info.doubleheight = DHL_OFF;
+  else if(dhl == DHL_TOP)
+    info.doubleheight = DHL_TOP;
+  else if(dhl == DHL_BOTTOM)
+    info.doubleheight = DHL_BOTTOM;
+
+  if((state->callbacks &&
+      state->callbacks->setlineinfo &&
+      (*state->callbacks->setlineinfo)(row, &info, state->lineinfo + row, state->cbdata))
+      || force)
+    state->lineinfo[row] = info;
+}
+
+static int on_text(const char bytes[], size_t len, void *user)
+{
+  VTermState *state = user;
+  int npoints = 0;
+  size_t eaten = 0;
+  VTermEncodingInstance *encoding;
+  int i = 0;
+
+  VTermPos oldpos = state->pos;
+
+  // We'll have at most len codepoints, plus one from a previous incomplete
+  // sequence.
+  uint32_t *codepoints = (uint32_t *)(state->vt->tmpbuffer);
+  size_t maxpoints = (state->vt->tmpbuffer_len) / sizeof(uint32_t);
+
+  encoding =
+    state->gsingle_set     ? &state->encoding[state->gsingle_set] :
+    !(bytes[eaten] & 0x80) ? &state->encoding[state->gl_set] :
+    state->vt->mode.utf8   ? &state->encoding_utf8 :
+                             &state->encoding[state->gr_set];
+
+  (*encoding->enc->decode)(encoding->enc, encoding->data,
+      codepoints, &npoints, state->gsingle_set ? 1 : (int)maxpoints,
+      bytes, &eaten, len);
+
+  /* There's a chance an encoding (e.g. UTF-8) hasn't found enough bytes yet
+   * for even a single codepoint
+   */
+  if(!npoints)
+  {
+    return (int)eaten;
+  }
+
+  if(state->gsingle_set && npoints)
+    state->gsingle_set = 0;
+
+  /* This is a combining char. that needs to be merged with the previous
+   * glyph output */
+  if(vterm_unicode_is_combining(codepoints[i])) {
+    /* See if the cursor has moved since */
+    if(state->pos.row == state->combine_pos.row && state->pos.col == state->combine_pos.col + state->combine_width) {
+#ifdef DEBUG_GLYPH_COMBINE
+      int printpos;
+      printf("DEBUG: COMBINING SPLIT GLYPH of chars {");
+      for(printpos = 0; state->combine_chars[printpos]; printpos++)
+        printf("U+%04x ", state->combine_chars[printpos]);
+      printf("} + {");
+#endif
+
+      /* Find where we need to append these combining chars */
+      int saved_i = 0;
+      while(state->combine_chars[saved_i])
+        saved_i++;
+
+      /* Add extra ones */
+      while(i < npoints && vterm_unicode_is_combining(codepoints[i])) {
+        if(saved_i >= (int)state->combine_chars_size)
+          grow_combine_buffer(state);
+        state->combine_chars[saved_i++] = codepoints[i++];
+      }
+      if(saved_i >= (int)state->combine_chars_size)
+        grow_combine_buffer(state);
+      state->combine_chars[saved_i] = 0;
+
+#ifdef DEBUG_GLYPH_COMBINE
+      for(; state->combine_chars[printpos]; printpos++)
+        printf("U+%04x ", state->combine_chars[printpos]);
+      printf("}\n");
+#endif
+
+      /* Now render it */
+      putglyph(state, state->combine_chars, state->combine_width, state->combine_pos);
+    }
+    else {
+      DEBUG_LOG("libvterm: TODO: Skip over split char+combining\n");
+    }
+  }
+
+  for(; i < npoints; i++) {
+    // Try to find combining characters following this
+    int glyph_starts = i;
+    int glyph_ends;
+    int width = 0;
+
+    for(glyph_ends = i + 1;
+        (glyph_ends < npoints) && (glyph_ends < glyph_starts + VTERM_MAX_CHARS_PER_CELL);
+        glyph_ends++)
+      if(!vterm_unicode_is_combining(codepoints[glyph_ends]))
+        break;
+
+    uint32_t *chars = vterm_allocator_malloc(state->vt, (VTERM_MAX_CHARS_PER_CELL + 1) * sizeof(uint32_t));
+    if (chars == NULL)
+      break;
+
+    for( ; i < glyph_ends; i++) {
+      int this_width;
+      if(vterm_get_special_pty_type() == 2) {
+        state->vt->in_backspace -= (state->vt->in_backspace > 0) ? 1 : 0;
+        if(state->vt->in_backspace == 1)
+          codepoints[i] = 0; // codepoints under this condition must be 0
+      }
+      chars[i - glyph_starts] = codepoints[i];
+      this_width = vterm_unicode_width(codepoints[i]);
+#ifdef DEBUG
+      if(this_width < 0) {
+        fprintf(stderr, "Text with negative-width codepoint U+%04x\n", codepoints[i]);
+        abort();
+      }
+#endif
+      if (i == glyph_starts || this_width > width)
+	width = this_width;  // TODO: should be += ?
+    }
+
+    while(i < npoints && vterm_unicode_is_combining(codepoints[i]))
+      i++;
+
+    chars[glyph_ends - glyph_starts] = 0;
+    i--;
+
+#ifdef DEBUG_GLYPH_COMBINE
+    int printpos;
+    printf("DEBUG: COMBINED GLYPH of %d chars {", glyph_ends - glyph_starts);
+    for(printpos = 0; printpos < glyph_ends - glyph_starts; printpos++)
+      printf("U+%04x ", chars[printpos]);
+    printf("}, onscreen width %d\n", width);
+#endif
+
+    if(state->at_phantom || state->pos.col + width > THISROWWIDTH(state)) {
+      linefeed(state);
+      state->pos.col = 0;
+      state->at_phantom = 0;
+      state->lineinfo[state->pos.row].continuation = 1;
+    }
+
+    if(state->mode.insert) {
+      // TODO: This will be a little inefficient for large bodies of text, as
+      // it'll have to 'ICH' effectively before every glyph. We should scan
+      // ahead and ICH as many times as required
+      VTermRect rect;
+      rect.start_row = state->pos.row;
+      rect.end_row   = state->pos.row + 1;
+      rect.start_col = state->pos.col;
+      rect.end_col   = THISROWWIDTH(state);
+      scroll(state, rect, 0, -1);
+    }
+
+    putglyph(state, chars, width, state->pos);
+
+    if(i == npoints - 1) {
+      /* End of the buffer. Save the chars in case we have to combine with
+       * more on the next call */
+      int save_i;
+      for(save_i = 0; chars[save_i]; save_i++) {
+        if(save_i >= (int)state->combine_chars_size)
+          grow_combine_buffer(state);
+        state->combine_chars[save_i] = chars[save_i];
+      }
+      if(save_i >= (int)state->combine_chars_size)
+        grow_combine_buffer(state);
+      state->combine_chars[save_i] = 0;
+      state->combine_width = width;
+      state->combine_pos = state->pos;
+    }
+
+    if(state->pos.col + width >= THISROWWIDTH(state)) {
+      if(state->mode.autowrap)
+        state->at_phantom = 1;
+    }
+    else {
+      state->pos.col += width;
+    }
+    vterm_allocator_free(state->vt, chars);
+  }
+
+  updatecursor(state, &oldpos, 0);
+
+#ifdef DEBUG
+  if(state->pos.row < 0 || state->pos.row >= state->rows ||
+     state->pos.col < 0 || state->pos.col >= state->cols) {
+    fprintf(stderr, "Position out of bounds after text: (%d,%d)\n",
+        state->pos.row, state->pos.col);
+    abort();
+  }
+#endif
+
+  return (int)eaten;
+}
+
+static int on_control(unsigned char control, void *user)
+{
+  VTermState *state = user;
+
+  VTermPos oldpos = state->pos;
+
+  VTermScreenCell cell;
+
+  // Preparing to see the leading byte
+  VTermPos leadpos = state->pos;
+  leadpos.col -= (leadpos.col >= 2 ? 2 : 0);
+
+  switch(control) {
+  case 0x07: // BEL - ECMA-48 8.3.3
+    if(state->callbacks && state->callbacks->bell)
+      (*state->callbacks->bell)(state->cbdata);
+    break;
+
+  case 0x08: // BS - ECMA-48 8.3.5
+    if(state->pos.col > 0)
+      state->pos.col--;
+    if(vterm_get_special_pty_type() == 2) {
+      // In 2 cell letters, go back 2 cells
+      vterm_screen_get_cell(state->vt->screen, leadpos, &cell);
+      if(vterm_unicode_width(cell.chars[0]) == 2)
+        state->pos.col--;
+    }
+    break;
+
+  case 0x09: // HT - ECMA-48 8.3.60
+    tab(state, 1, +1);
+    break;
+
+  case 0x0a: // LF - ECMA-48 8.3.74
+  case 0x0b: // VT
+  case 0x0c: // FF
+    linefeed(state);
+    if(state->mode.newline)
+      state->pos.col = 0;
+    break;
+
+  case 0x0d: // CR - ECMA-48 8.3.15
+    state->pos.col = 0;
+    break;
+
+  case 0x0e: // LS1 - ECMA-48 8.3.76
+    state->gl_set = 1;
+    break;
+
+  case 0x0f: // LS0 - ECMA-48 8.3.75
+    state->gl_set = 0;
+    break;
+
+  case 0x84: // IND - DEPRECATED but implemented for completeness
+    linefeed(state);
+    break;
+
+  case 0x85: // NEL - ECMA-48 8.3.86
+    linefeed(state);
+    state->pos.col = 0;
+    break;
+
+  case 0x88: // HTS - ECMA-48 8.3.62
+    set_col_tabstop(state, state->pos.col);
+    break;
+
+  case 0x8d: // RI - ECMA-48 8.3.104
+    if(state->pos.row == state->scrollregion_top) {
+      VTermRect rect;
+      rect.start_row = state->scrollregion_top;
+      rect.end_row   = SCROLLREGION_BOTTOM(state);
+      rect.start_col = SCROLLREGION_LEFT(state);
+      rect.end_col   = SCROLLREGION_RIGHT(state);
+
+      scroll(state, rect, -1, 0);
+    }
+    else if(state->pos.row > 0)
+        state->pos.row--;
+    break;
+
+  case 0x8e: // SS2 - ECMA-48 8.3.141
+    state->gsingle_set = 2;
+    break;
+
+  case 0x8f: // SS3 - ECMA-48 8.3.142
+    state->gsingle_set = 3;
+    break;
+
+  default:
+    if(state->fallbacks && state->fallbacks->control)
+      if((*state->fallbacks->control)(control, state->fbdata))
+        return 1;
+
+    return 0;
+  }
+
+  updatecursor(state, &oldpos, 1);
+
+#ifdef DEBUG
+  if(state->pos.row < 0 || state->pos.row >= state->rows ||
+     state->pos.col < 0 || state->pos.col >= state->cols) {
+    fprintf(stderr, "Position out of bounds after Ctrl %02x: (%d,%d)\n",
+        control, state->pos.row, state->pos.col);
+    abort();
+  }
+#endif
+
+  return 1;
+}
+
+static int settermprop_bool(VTermState *state, VTermProp prop, int v)
+{
+  VTermValue val;
+  val.boolean = v;
+  return vterm_state_set_termprop(state, prop, &val);
+}
+
+static int settermprop_int(VTermState *state, VTermProp prop, int v)
+{
+  VTermValue val;
+  val.number = v;
+  return vterm_state_set_termprop(state, prop, &val);
+}
+
+static int settermprop_string(VTermState *state, VTermProp prop, VTermStringFragment frag)
+{
+  VTermValue val;
+
+  val.string = frag;
+  return vterm_state_set_termprop(state, prop, &val);
+}
+
+static void savecursor(VTermState *state, int save)
+{
+  if(save) {
+    state->saved.pos = state->pos;
+    state->saved.mode.cursor_visible = state->mode.cursor_visible;
+    state->saved.mode.cursor_blink   = state->mode.cursor_blink;
+    state->saved.mode.cursor_shape   = state->mode.cursor_shape;
+
+    vterm_state_savepen(state, 1);
+  }
+  else {
+    VTermPos oldpos = state->pos;
+
+    state->pos = state->saved.pos;
+
+    settermprop_bool(state, VTERM_PROP_CURSORVISIBLE, state->saved.mode.cursor_visible);
+    settermprop_bool(state, VTERM_PROP_CURSORBLINK,   state->saved.mode.cursor_blink);
+    settermprop_int (state, VTERM_PROP_CURSORSHAPE,   state->saved.mode.cursor_shape);
+
+    vterm_state_savepen(state, 0);
+
+    updatecursor(state, &oldpos, 1);
+  }
+}
+
+static int on_escape(const char *bytes, size_t len, void *user)
+{
+  VTermState *state = user;
+
+  /* Easier to decode this from the first byte, even though the final
+   * byte terminates it
+   */
+  switch(bytes[0]) {
+  case ' ':
+    if(len != 2)
+      return 0;
+
+    switch(bytes[1]) {
+      case 'F': // S7C1T
+        state->vt->mode.ctrl8bit = 0;
+        break;
+
+      case 'G': // S8C1T
+        state->vt->mode.ctrl8bit = 1;
+        break;
+
+      default:
+        return 0;
+    }
+    return 2;
+
+  case '#':
+    if(len != 2)
+      return 0;
+
+    switch(bytes[1]) {
+      case '3': // DECDHL top
+        if(state->mode.leftrightmargin)
+          break;
+        set_lineinfo(state, state->pos.row, NO_FORCE, DWL_ON, DHL_TOP);
+        break;
+
+      case '4': // DECDHL bottom
+        if(state->mode.leftrightmargin)
+          break;
+        set_lineinfo(state, state->pos.row, NO_FORCE, DWL_ON, DHL_BOTTOM);
+        break;
+
+      case '5': // DECSWL
+        if(state->mode.leftrightmargin)
+          break;
+        set_lineinfo(state, state->pos.row, NO_FORCE, DWL_OFF, DHL_OFF);
+        break;
+
+      case '6': // DECDWL
+        if(state->mode.leftrightmargin)
+          break;
+        set_lineinfo(state, state->pos.row, NO_FORCE, DWL_ON, DHL_OFF);
+        break;
+
+      case '8': // DECALN
+      {
+        VTermPos pos;
+        uint32_t E[] = { 'E', 0 };
+        for(pos.row = 0; pos.row < state->rows; pos.row++)
+          for(pos.col = 0; pos.col < ROWWIDTH(state, pos.row); pos.col++)
+            putglyph(state, E, 1, pos);
+        break;
+      }
+
+      default:
+        return 0;
+    }
+    return 2;
+
+  case '(': case ')': case '*': case '+': // SCS
+    if(len != 2)
+      return 0;
+
+    {
+      int setnum = bytes[0] - 0x28;
+      VTermEncoding *newenc = vterm_lookup_encoding(ENC_SINGLE_94, bytes[1]);
+
+      if(newenc) {
+        state->encoding[setnum].enc = newenc;
+
+        if(newenc->init)
+          (*newenc->init)(newenc, state->encoding[setnum].data);
+      }
+    }
+
+    return 2;
+
+  case '7': // DECSC
+    savecursor(state, 1);
+    return 1;
+
+  case '8': // DECRC
+    savecursor(state, 0);
+    return 1;
+
+  case '<': // Ignored by VT100. Used in VT52 mode to switch up to VT100
+    return 1;
+
+  case '=': // DECKPAM
+    state->mode.keypad = 1;
+    return 1;
+
+  case '>': // DECKPNM
+    state->mode.keypad = 0;
+    return 1;
+
+  case 'c': // RIS - ECMA-48 8.3.105
+  {
+    VTermPos oldpos = state->pos;
+    vterm_state_reset(state, 1);
+    if(state->callbacks && state->callbacks->movecursor)
+      (*state->callbacks->movecursor)(state->pos, oldpos, state->mode.cursor_visible, state->cbdata);
+    return 1;
+  }
+
+  case 'n': // LS2 - ECMA-48 8.3.78
+    state->gl_set = 2;
+    return 1;
+
+  case 'o': // LS3 - ECMA-48 8.3.80
+    state->gl_set = 3;
+    return 1;
+
+  case '~': // LS1R - ECMA-48 8.3.77
+    state->gr_set = 1;
+    return 1;
+
+  case '}': // LS2R - ECMA-48 8.3.79
+    state->gr_set = 2;
+    return 1;
+
+  case '|': // LS3R - ECMA-48 8.3.81
+    state->gr_set = 3;
+    return 1;
+
+  default:
+    return 0;
+  }
+}
+
+static void set_mode(VTermState *state, int num, int val)
+{
+  switch(num) {
+  case 4: // IRM - ECMA-48 7.2.10
+    state->mode.insert = val;
+    break;
+
+  case 20: // LNM - ANSI X3.4-1977
+    state->mode.newline = val;
+    break;
+
+  default:
+    DEBUG_LOG1("libvterm: Unknown mode %d\n", num);
+    return;
+  }
+}
+
+static void set_dec_mode(VTermState *state, int num, int val)
+{
+  switch(num) {
+  case 1:
+    state->mode.cursor = val;
+    break;
+
+  case 5: // DECSCNM - screen mode
+    settermprop_bool(state, VTERM_PROP_REVERSE, val);
+    break;
+
+  case 6: // DECOM - origin mode
+    {
+      VTermPos oldpos = state->pos;
+      state->mode.origin = val;
+      state->pos.row = state->mode.origin ? state->scrollregion_top : 0;
+      state->pos.col = state->mode.origin ? SCROLLREGION_LEFT(state) : 0;
+      updatecursor(state, &oldpos, 1);
+    }
+    break;
+
+  case 7:
+    state->mode.autowrap = val;
+    break;
+
+  case 12:
+    settermprop_bool(state, VTERM_PROP_CURSORBLINK, val);
+    break;
+
+  case 25:
+    settermprop_bool(state, VTERM_PROP_CURSORVISIBLE, val);
+    break;
+
+  case 69: // DECVSSM - vertical split screen mode
+           // DECLRMM - left/right margin mode
+    state->mode.leftrightmargin = val;
+    if(val) {
+      int row;
+
+      // Setting DECVSSM must clear doublewidth/doubleheight state of every line
+      for(row = 0; row < state->rows; row++)
+        set_lineinfo(state, row, FORCE, DWL_OFF, DHL_OFF);
+    }
+
+    break;
+
+  case 1000:
+  case 1002:
+  case 1003:
+    settermprop_int(state, VTERM_PROP_MOUSE,
+        !val          ? VTERM_PROP_MOUSE_NONE  :
+        (num == 1000) ? VTERM_PROP_MOUSE_CLICK :
+        (num == 1002) ? VTERM_PROP_MOUSE_DRAG  :
+                        VTERM_PROP_MOUSE_MOVE);
+    break;
+
+  case 1004:
+    state->mode.report_focus = val;
+    break;
+
+  case 1005:
+    state->mouse_protocol = val ? MOUSE_UTF8 : MOUSE_X10;
+    break;
+
+  case 1006:
+    state->mouse_protocol = val ? MOUSE_SGR : MOUSE_X10;
+    break;
+
+  case 1015:
+    state->mouse_protocol = val ? MOUSE_RXVT : MOUSE_X10;
+    break;
+
+  case 1047:
+    settermprop_bool(state, VTERM_PROP_ALTSCREEN, val);
+    break;
+
+  case 1048:
+    savecursor(state, val);
+    break;
+
+  case 1049:
+    settermprop_bool(state, VTERM_PROP_ALTSCREEN, val);
+    savecursor(state, val);
+    break;
+
+  case 2004:
+    state->mode.bracketpaste = val;
+    break;
+
+  default:
+    DEBUG_LOG1("libvterm: Unknown DEC mode %d\n", num);
+    return;
+  }
+}
+
+static void request_dec_mode(VTermState *state, int num)
+{
+  int reply;
+
+  switch(num) {
+    case 1:
+      reply = state->mode.cursor;
+      break;
+
+    case 5:
+      reply = state->mode.screen;
+      break;
+
+    case 6:
+      reply = state->mode.origin;
+      break;
+
+    case 7:
+      reply = state->mode.autowrap;
+      break;
+
+    case 12:
+      reply = state->mode.cursor_blink;
+      break;
+
+    case 25:
+      reply = state->mode.cursor_visible;
+      break;
+
+    case 69:
+      reply = state->mode.leftrightmargin;
+      break;
+
+    case 1000:
+      reply = state->mouse_flags == MOUSE_WANT_CLICK;
+      break;
+
+    case 1002:
+      reply = state->mouse_flags == (MOUSE_WANT_CLICK|MOUSE_WANT_DRAG);
+      break;
+
+    case 1003:
+      reply = state->mouse_flags == (MOUSE_WANT_CLICK|MOUSE_WANT_MOVE);
+      break;
+
+    case 1004:
+      reply = state->mode.report_focus;
+      break;
+
+    case 1005:
+      reply = state->mouse_protocol == MOUSE_UTF8;
+      break;
+
+    case 1006:
+      reply = state->mouse_protocol == MOUSE_SGR;
+      break;
+
+    case 1015:
+      reply = state->mouse_protocol == MOUSE_RXVT;
+      break;
+
+    case 1047:
+      reply = state->mode.alt_screen;
+      break;
+
+    case 2004:
+      reply = state->mode.bracketpaste;
+      break;
+
+    default:
+      vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "?%d;%d$y", num, 0);
+      return;
+  }
+
+  vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "?%d;%d$y", num, reply ? 1 : 2);
+}
+
+static void request_version_string(VTermState *state)
+{
+  vterm_push_output_sprintf_str(state->vt, C1_DCS, TRUE, ">|libvterm(%d.%d)",
+      VTERM_VERSION_MAJOR, VTERM_VERSION_MINOR);
+}
+
+static int on_csi(const char *leader, const long args[], int argcount, const char *intermed, char command, void *user)
+{
+  VTermState *state = user;
+  int leader_byte = 0;
+  int intermed_byte = 0;
+  int cancel_phantom = 1;
+  VTermPos oldpos = state->pos;
+  int handled = 1;
+
+  // Some temporaries for later code
+  int count, val;
+  int row, col;
+  VTermRect rect;
+  int selective;
+
+  if(leader && leader[0]) {
+    if(leader[1]) // longer than 1 char
+      return 0;
+
+    switch(leader[0]) {
+    case '?':
+    case '>':
+      leader_byte = leader[0];
+      break;
+    default:
+      return 0;
+    }
+  }
+
+  if(intermed && intermed[0]) {
+    if(intermed[1]) // longer than 1 char
+      return 0;
+
+    switch(intermed[0]) {
+    case ' ':
+    case '"':
+    case '$':
+    case '\'':
+      intermed_byte = intermed[0];
+      break;
+    default:
+      return 0;
+    }
+  }
+
+  oldpos = state->pos;
+
+#define LBOUND(v,min) if((v) < (min)) (v) = (min)
+#define UBOUND(v,max) if((v) > (max)) (v) = (max)
+
+#define LEADER(l,b) ((l << 8) | b)
+#define INTERMED(i,b) ((i << 16) | b)
+
+  switch(intermed_byte << 16 | leader_byte << 8 | command) {
+  case 0x40: // ICH - ECMA-48 8.3.64
+    count = CSI_ARG_COUNT(args[0]);
+
+    if(!is_cursor_in_scrollregion(state))
+      break;
+
+    rect.start_row = state->pos.row;
+    rect.end_row   = state->pos.row + 1;
+    rect.start_col = state->pos.col;
+    if(state->mode.leftrightmargin)
+      rect.end_col = SCROLLREGION_RIGHT(state);
+    else
+      rect.end_col = THISROWWIDTH(state);
+
+    scroll(state, rect, 0, -count);
+
+    break;
+
+  case 0x41: // CUU - ECMA-48 8.3.22
+    count = CSI_ARG_COUNT(args[0]);
+    state->pos.row -= count;
+    state->at_phantom = 0;
+    break;
+
+  case 0x42: // CUD - ECMA-48 8.3.19
+    count = CSI_ARG_COUNT(args[0]);
+    state->pos.row += count;
+    state->at_phantom = 0;
+    break;
+
+  case 0x43: // CUF - ECMA-48 8.3.20
+    count = CSI_ARG_COUNT(args[0]);
+    state->pos.col += count;
+    state->at_phantom = 0;
+    break;
+
+  case 0x44: // CUB - ECMA-48 8.3.18
+    count = CSI_ARG_COUNT(args[0]);
+    state->pos.col -= count;
+    state->at_phantom = 0;
+    break;
+
+  case 0x45: // CNL - ECMA-48 8.3.12
+    count = CSI_ARG_COUNT(args[0]);
+    state->pos.col = 0;
+    state->pos.row += count;
+    state->at_phantom = 0;
+    break;
+
+  case 0x46: // CPL - ECMA-48 8.3.13
+    count = CSI_ARG_COUNT(args[0]);
+    state->pos.col = 0;
+    state->pos.row -= count;
+    state->at_phantom = 0;
+    break;
+
+  case 0x47: // CHA - ECMA-48 8.3.9
+    val = CSI_ARG_OR(args[0], 1);
+    state->pos.col = val-1;
+    state->at_phantom = 0;
+    break;
+
+  case 0x48: // CUP - ECMA-48 8.3.21
+    row = CSI_ARG_OR(args[0], 1);
+    col = argcount < 2 || CSI_ARG_IS_MISSING(args[1]) ? 1 : CSI_ARG(args[1]);
+    // zero-based
+    if(vterm_get_special_pty_type() == 2) {
+      // Fix a sequence that is not correct right now
+      if(state->pos.row == row - 1) {
+        int cnt, ptr = 0;
+        for(cnt = 0; cnt < col - 1; ++cnt) {
+	  VTermPos p;
+	  VTermScreenCell c0, c1;
+	  p.row = row - 1;
+	  p.col = ptr;
+	  vterm_screen_get_cell(state->vt->screen, p, &c0);
+	  p.col++;
+	  vterm_screen_get_cell(state->vt->screen, p, &c1);
+	  ptr += (c1.chars[0] == (uint32_t)-1)		    // double cell?
+	     ? (vterm_unicode_is_ambiguous(c0.chars[0]))    // is ambiguous?
+	     ? vterm_unicode_width(0x00a1) : 1		    // &ambiwidth
+	     : 1;					    // not ambiguous
+        }
+        col = ptr + 1;
+      }
+    }
+    state->pos.row = row-1;
+    state->pos.col = col-1;
+    if(state->mode.origin) {
+      state->pos.row += state->scrollregion_top;
+      state->pos.col += SCROLLREGION_LEFT(state);
+    }
+    state->at_phantom = 0;
+    break;
+
+  case 0x49: // CHT - ECMA-48 8.3.10
+    count = CSI_ARG_COUNT(args[0]);
+    tab(state, count, +1);
+    break;
+
+  case 0x4a: // ED - ECMA-48 8.3.39
+  case LEADER('?', 0x4a): // DECSED - Selective Erase in Display
+    selective = (leader_byte == '?');
+    switch(CSI_ARG(args[0])) {
+    case CSI_ARG_MISSING:
+    case 0:
+      rect.start_row = state->pos.row; rect.end_row = state->pos.row + 1;
+      rect.start_col = state->pos.col; rect.end_col = state->cols;
+      if(rect.end_col > rect.start_col)
+        erase(state, rect, selective);
+
+      rect.start_row = state->pos.row + 1; rect.end_row = state->rows;
+      rect.start_col = 0;
+      for(row = rect.start_row; row < rect.end_row; row++)
+	set_lineinfo(state, row, FORCE, DWL_OFF, DHL_OFF);
+      if(rect.end_row > rect.start_row)
+        erase(state, rect, selective);
+      break;
+
+    case 1:
+      rect.start_row = 0; rect.end_row = state->pos.row;
+      rect.start_col = 0; rect.end_col = state->cols;
+      for(row = rect.start_row; row < rect.end_row; row++)
+	set_lineinfo(state, row, FORCE, DWL_OFF, DHL_OFF);
+      if(rect.end_col > rect.start_col)
+        erase(state, rect, selective);
+
+      rect.start_row = state->pos.row; rect.end_row = state->pos.row + 1;
+                          rect.end_col = state->pos.col + 1;
+      if(rect.end_row > rect.start_row)
+        erase(state, rect, selective);
+      break;
+
+    case 2:
+      rect.start_row = 0; rect.end_row = state->rows;
+      rect.start_col = 0; rect.end_col = state->cols;
+      for(row = rect.start_row; row < rect.end_row; row++)
+	set_lineinfo(state, row, FORCE, DWL_OFF, DHL_OFF);
+      erase(state, rect, selective);
+      break;
+
+    case 3:
+      if(state->callbacks && state->callbacks->sb_clear)
+        if((*state->callbacks->sb_clear)(state->cbdata))
+          return 1;
+      break;
+    }
+    break;
+
+  case 0x4b: // EL - ECMA-48 8.3.41
+  case LEADER('?', 0x4b): // DECSEL - Selective Erase in Line
+    selective = (leader_byte == '?');
+    rect.start_row = state->pos.row;
+    rect.end_row   = state->pos.row + 1;
+
+    switch(CSI_ARG(args[0])) {
+    case CSI_ARG_MISSING:
+    case 0:
+      rect.start_col = state->pos.col; rect.end_col = THISROWWIDTH(state); break;
+    case 1:
+      rect.start_col = 0; rect.end_col = state->pos.col + 1; break;
+    case 2:
+      rect.start_col = 0; rect.end_col = THISROWWIDTH(state); break;
+    default:
+      return 0;
+    }
+
+    if(rect.end_col > rect.start_col)
+      erase(state, rect, selective);
+
+    break;
+
+  case 0x4c: // IL - ECMA-48 8.3.67
+    count = CSI_ARG_COUNT(args[0]);
+
+    if(!is_cursor_in_scrollregion(state))
+      break;
+
+    rect.start_row = state->pos.row;
+    rect.end_row   = SCROLLREGION_BOTTOM(state);
+    rect.start_col = SCROLLREGION_LEFT(state);
+    rect.end_col   = SCROLLREGION_RIGHT(state);
+
+    scroll(state, rect, -count, 0);
+
+    break;
+
+  case 0x4d: // DL - ECMA-48 8.3.32
+    count = CSI_ARG_COUNT(args[0]);
+
+    if(!is_cursor_in_scrollregion(state))
+      break;
+
+    rect.start_row = state->pos.row;
+    rect.end_row   = SCROLLREGION_BOTTOM(state);
+    rect.start_col = SCROLLREGION_LEFT(state);
+    rect.end_col   = SCROLLREGION_RIGHT(state);
+
+    scroll(state, rect, count, 0);
+
+    break;
+
+  case 0x50: // DCH - ECMA-48 8.3.26
+    count = CSI_ARG_COUNT(args[0]);
+
+    if(!is_cursor_in_scrollregion(state))
+      break;
+
+    rect.start_row = state->pos.row;
+    rect.end_row   = state->pos.row + 1;
+    rect.start_col = state->pos.col;
+    if(state->mode.leftrightmargin)
+      rect.end_col = SCROLLREGION_RIGHT(state);
+    else
+      rect.end_col = THISROWWIDTH(state);
+
+    scroll(state, rect, 0, count);
+
+    break;
+
+  case 0x53: // SU - ECMA-48 8.3.147
+    count = CSI_ARG_COUNT(args[0]);
+
+    rect.start_row = state->scrollregion_top;
+    rect.end_row   = SCROLLREGION_BOTTOM(state);
+    rect.start_col = SCROLLREGION_LEFT(state);
+    rect.end_col   = SCROLLREGION_RIGHT(state);
+
+    scroll(state, rect, count, 0);
+
+    break;
+
+  case 0x54: // SD - ECMA-48 8.3.113
+    count = CSI_ARG_COUNT(args[0]);
+
+    rect.start_row = state->scrollregion_top;
+    rect.end_row   = SCROLLREGION_BOTTOM(state);
+    rect.start_col = SCROLLREGION_LEFT(state);
+    rect.end_col   = SCROLLREGION_RIGHT(state);
+
+    scroll(state, rect, -count, 0);
+
+    break;
+
+  case 0x58: // ECH - ECMA-48 8.3.38
+    count = CSI_ARG_COUNT(args[0]);
+
+    rect.start_row = state->pos.row;
+    rect.end_row   = state->pos.row + 1;
+    rect.start_col = state->pos.col;
+    rect.end_col   = state->pos.col + count;
+    UBOUND(rect.end_col, THISROWWIDTH(state));
+
+    erase(state, rect, 0);
+    break;
+
+  case 0x5a: // CBT - ECMA-48 8.3.7
+    count = CSI_ARG_COUNT(args[0]);
+    tab(state, count, -1);
+    break;
+
+  case 0x60: // HPA - ECMA-48 8.3.57
+    col = CSI_ARG_OR(args[0], 1);
+    state->pos.col = col-1;
+    state->at_phantom = 0;
+    break;
+
+  case 0x61: // HPR - ECMA-48 8.3.59
+    count = CSI_ARG_COUNT(args[0]);
+    state->pos.col += count;
+    state->at_phantom = 0;
+    break;
+
+  case 0x62: { // REP - ECMA-48 8.3.103
+    const int row_width = THISROWWIDTH(state);
+    count = CSI_ARG_COUNT(args[0]);
+    col = state->pos.col + count;
+    UBOUND(col, row_width);
+    while (state->pos.col < col) {
+      putglyph(state, state->combine_chars, state->combine_width, state->pos);
+      state->pos.col += state->combine_width;
+    }
+    if (state->pos.col + state->combine_width >= row_width) {
+      if (state->mode.autowrap) {
+        state->at_phantom = 1;
+        cancel_phantom = 0;
+      }
+    }
+    break;
+  }
+
+  case 0x63: // DA - ECMA-48 8.3.24
+    val = CSI_ARG_OR(args[0], 0);
+    if(val == 0)
+      // DEC VT100 response
+      vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "?1;2c");
+    break;
+
+  case LEADER('>', 0x63): // DEC secondary Device Attributes
+    // This returns xterm version number 100.
+    vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, ">%d;%d;%dc", 0, 100, 0);
+    break;
+
+  case 0x64: // VPA - ECMA-48 8.3.158
+    row = CSI_ARG_OR(args[0], 1);
+    state->pos.row = row-1;
+    if(state->mode.origin)
+      state->pos.row += state->scrollregion_top;
+    state->at_phantom = 0;
+    break;
+
+  case 0x65: // VPR - ECMA-48 8.3.160
+    count = CSI_ARG_COUNT(args[0]);
+    state->pos.row += count;
+    state->at_phantom = 0;
+    break;
+
+  case 0x66: // HVP - ECMA-48 8.3.63
+    row = CSI_ARG_OR(args[0], 1);
+    col = argcount < 2 || CSI_ARG_IS_MISSING(args[1]) ? 1 : CSI_ARG(args[1]);
+    // zero-based
+    state->pos.row = row-1;
+    state->pos.col = col-1;
+    if(state->mode.origin) {
+      state->pos.row += state->scrollregion_top;
+      state->pos.col += SCROLLREGION_LEFT(state);
+    }
+    state->at_phantom = 0;
+    break;
+
+  case 0x67: // TBC - ECMA-48 8.3.154
+    val = CSI_ARG_OR(args[0], 0);
+
+    switch(val) {
+    case 0:
+      clear_col_tabstop(state, state->pos.col);
+      break;
+    case 3:
+    case 5:
+      for(col = 0; col < state->cols; col++)
+        clear_col_tabstop(state, col);
+      break;
+    case 1:
+    case 2:
+    case 4:
+      break;
+    /* TODO: 1, 2 and 4 aren't meaningful yet without line tab stops */
+    default:
+      return 0;
+    }
+    break;
+
+  case 0x68: // SM - ECMA-48 8.3.125
+    if(!CSI_ARG_IS_MISSING(args[0]))
+      set_mode(state, CSI_ARG(args[0]), 1);
+    break;
+
+  case LEADER('?', 0x68): // DEC private mode set
+    if(!CSI_ARG_IS_MISSING(args[0]))
+      set_dec_mode(state, CSI_ARG(args[0]), 1);
+    break;
+
+  case 0x6a: // HPB - ECMA-48 8.3.58
+    count = CSI_ARG_COUNT(args[0]);
+    state->pos.col -= count;
+    state->at_phantom = 0;
+    break;
+
+  case 0x6b: // VPB - ECMA-48 8.3.159
+    count = CSI_ARG_COUNT(args[0]);
+    state->pos.row -= count;
+    state->at_phantom = 0;
+    break;
+
+  case 0x6c: // RM - ECMA-48 8.3.106
+    if(!CSI_ARG_IS_MISSING(args[0]))
+      set_mode(state, CSI_ARG(args[0]), 0);
+    break;
+
+  case LEADER('?', 0x6c): // DEC private mode reset
+    if(!CSI_ARG_IS_MISSING(args[0]))
+      set_dec_mode(state, CSI_ARG(args[0]), 0);
+    break;
+
+  case 0x6d: // SGR - ECMA-48 8.3.117
+    vterm_state_setpen(state, args, argcount);
+    break;
+
+  case LEADER('?', 0x6d): // DECSGR and XTQMODKEYS
+    // CSI ? 4 m  XTQMODKEYS: request modifyOtherKeys level
+    if (argcount == 1 && CSI_ARG(args[0]) == 4)
+    {
+      vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, ">4;%dm",
+					state->mode.modify_other_keys ? 2 : 0);
+      break;
+    }
+
+    /* No actual DEC terminal recognised these, but some printers did. These
+     * are alternative ways to request subscript/superscript/off
+     */
+    for(int argi = 0; argi < argcount; argi++) {
+      long arg;
+      switch(arg = CSI_ARG(args[argi])) {
+        case 4: // Superscript on
+          arg = 73;
+          vterm_state_setpen(state, &arg, 1);
+          break;
+        case 5: // Subscript on
+          arg = 74;
+          vterm_state_setpen(state, &arg, 1);
+          break;
+        case 24: // Super+subscript off
+          arg = 75;
+          vterm_state_setpen(state, &arg, 1);
+          break;
+      }
+    }
+    break;
+
+  case LEADER('>', 0x6d): // CSI > 4 ; Pv m   xterm resource modifyOtherKeys
+    if (argcount == 2 && CSI_ARG(args[0]) == 4)
+    {
+      // can't have both modify_other_keys and kitty_keyboard
+      state->mode.kitty_keyboard = 0;
+
+      state->mode.modify_other_keys = CSI_ARG(args[1]) == 2;
+    }
+    break;
+
+  case LEADER('>', 0x75): // CSI > 1 u  enable kitty keyboard protocol
+    if (argcount == 1 && CSI_ARG(args[0]) == 1)
+    {
+      // can't have both modify_other_keys and kitty_keyboard
+      state->mode.modify_other_keys = 0;
+
+      state->mode.kitty_keyboard = 1;
+    }
+    break;
+
+  case LEADER('<', 0x75): // CSI < u  disable kitty keyboard protocol
+    if (argcount <= 1)
+      state->mode.kitty_keyboard = 0;
+    break;
+
+  case LEADER('?', 0x75): // CSI ? u  request kitty keyboard protocol state
+    if (argcount <= 1)
+      // TODO: this only uses the values zero and one.  The protocol specifies
+      // more values, the progressive enhancement flags.
+      vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "?%du",
+						   state->mode.kitty_keyboard);
+    break;
+
+  case 0x6e: // DSR - ECMA-48 8.3.35
+  case LEADER('?', 0x6e): // DECDSR
+    val = CSI_ARG_OR(args[0], 0);
+
+    {
+      char *qmark = (leader_byte == '?') ? "?" : "";
+
+      switch(val) {
+      case 0: case 1: case 2: case 3: case 4:
+        // ignore - these are replies
+        break;
+      case 5:
+        vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "%s0n", qmark);
+        break;
+      case 6: // CPR - cursor position report
+        vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "%s%d;%dR", qmark, state->pos.row + 1, state->pos.col + 1);
+        break;
+      }
+    }
+    break;
+
+
+  case LEADER('!', 0x70): // DECSTR - DEC soft terminal reset
+    vterm_state_reset(state, 0);
+    break;
+
+  case LEADER('?', INTERMED('$', 0x70)):
+    request_dec_mode(state, CSI_ARG(args[0]));
+    break;
+
+  case LEADER('>', 0x71): // XTVERSION - xterm query version string
+    request_version_string(state);
+    break;
+
+  case INTERMED(' ', 0x71): // DECSCUSR - DEC set cursor shape
+    val = CSI_ARG_OR(args[0], 1);
+
+    switch(val) {
+    case 0: case 1:
+      settermprop_bool(state, VTERM_PROP_CURSORBLINK, 1);
+      settermprop_int (state, VTERM_PROP_CURSORSHAPE, VTERM_PROP_CURSORSHAPE_BLOCK);
+      break;
+    case 2:
+      settermprop_bool(state, VTERM_PROP_CURSORBLINK, 0);
+      settermprop_int (state, VTERM_PROP_CURSORSHAPE, VTERM_PROP_CURSORSHAPE_BLOCK);
+      break;
+    case 3:
+      settermprop_bool(state, VTERM_PROP_CURSORBLINK, 1);
+      settermprop_int (state, VTERM_PROP_CURSORSHAPE, VTERM_PROP_CURSORSHAPE_UNDERLINE);
+      break;
+    case 4:
+      settermprop_bool(state, VTERM_PROP_CURSORBLINK, 0);
+      settermprop_int (state, VTERM_PROP_CURSORSHAPE, VTERM_PROP_CURSORSHAPE_UNDERLINE);
+      break;
+    case 5:
+      settermprop_bool(state, VTERM_PROP_CURSORBLINK, 1);
+      settermprop_int (state, VTERM_PROP_CURSORSHAPE, VTERM_PROP_CURSORSHAPE_BAR_LEFT);
+      break;
+    case 6:
+      settermprop_bool(state, VTERM_PROP_CURSORBLINK, 0);
+      settermprop_int (state, VTERM_PROP_CURSORSHAPE, VTERM_PROP_CURSORSHAPE_BAR_LEFT);
+      break;
+    }
+
+    break;
+
+  case INTERMED('"', 0x71): // DECSCA - DEC select character protection attribute
+    val = CSI_ARG_OR(args[0], 0);
+
+    switch(val) {
+    case 0: case 2:
+      state->protected_cell = 0;
+      break;
+    case 1:
+      state->protected_cell = 1;
+      break;
+    }
+
+    break;
+
+  case 0x72: // DECSTBM - DEC custom
+    state->scrollregion_top = CSI_ARG_OR(args[0], 1) - 1;
+    state->scrollregion_bottom = argcount < 2 || CSI_ARG_IS_MISSING(args[1]) ? -1 : CSI_ARG(args[1]);
+    LBOUND(state->scrollregion_top, 0);
+    UBOUND(state->scrollregion_top, state->rows);
+    LBOUND(state->scrollregion_bottom, -1);
+    if(state->scrollregion_top == 0 && state->scrollregion_bottom == state->rows)
+      state->scrollregion_bottom = -1;
+    else
+      UBOUND(state->scrollregion_bottom, state->rows);
+
+    if(SCROLLREGION_BOTTOM(state) <= state->scrollregion_top) {
+      // Invalid
+      state->scrollregion_top    = 0;
+      state->scrollregion_bottom = -1;
+    }
+
+    // Setting the scrolling region restores the cursor to the home position
+    state->pos.row = 0;
+    state->pos.col = 0;
+    if(state->mode.origin) {
+      state->pos.row += state->scrollregion_top;
+      state->pos.col += SCROLLREGION_LEFT(state);
+    }
+
+    break;
+
+  case 0x73: // DECSLRM - DEC custom
+    // Always allow setting these margins, just they won't take effect without DECVSSM
+    state->scrollregion_left = CSI_ARG_OR(args[0], 1) - 1;
+    state->scrollregion_right = argcount < 2 || CSI_ARG_IS_MISSING(args[1]) ? -1 : CSI_ARG(args[1]);
+    LBOUND(state->scrollregion_left, 0);
+    UBOUND(state->scrollregion_left, state->cols);
+    LBOUND(state->scrollregion_right, -1);
+    if(state->scrollregion_left == 0 && state->scrollregion_right == state->cols)
+      state->scrollregion_right = -1;
+    else
+      UBOUND(state->scrollregion_right, state->cols);
+
+    if(state->scrollregion_right > -1 &&
+       state->scrollregion_right <= state->scrollregion_left) {
+      // Invalid
+      state->scrollregion_left  = 0;
+      state->scrollregion_right = -1;
+    }
+
+    // Setting the scrolling region restores the cursor to the home position
+    state->pos.row = 0;
+    state->pos.col = 0;
+    if(state->mode.origin) {
+      state->pos.row += state->scrollregion_top;
+      state->pos.col += SCROLLREGION_LEFT(state);
+    }
+
+    break;
+
+  case 0x74:
+    switch(CSI_ARG(args[0])) {
+      case 8: // CSI 8 ; rows ; cols t  set size
+	if (argcount == 3)
+	  on_resize(CSI_ARG(args[1]), CSI_ARG(args[2]), state);
+	break;
+      default:
+	handled = 0;
+	break;
+    }
+    break;
+
+  case INTERMED('\'', 0x7D): // DECIC
+    count = CSI_ARG_COUNT(args[0]);
+
+    if(!is_cursor_in_scrollregion(state))
+      break;
+
+    rect.start_row = state->scrollregion_top;
+    rect.end_row   = SCROLLREGION_BOTTOM(state);
+    rect.start_col = state->pos.col;
+    rect.end_col   = SCROLLREGION_RIGHT(state);
+
+    scroll(state, rect, 0, -count);
+
+    break;
+
+  case INTERMED('\'', 0x7E): // DECDC
+    count = CSI_ARG_COUNT(args[0]);
+
+    if(!is_cursor_in_scrollregion(state))
+      break;
+
+    rect.start_row = state->scrollregion_top;
+    rect.end_row   = SCROLLREGION_BOTTOM(state);
+    rect.start_col = state->pos.col;
+    rect.end_col   = SCROLLREGION_RIGHT(state);
+
+    scroll(state, rect, 0, count);
+
+    break;
+
+  default:
+    handled = 0;
+    break;
+  }
+
+  if (!handled) {
+    if(state->fallbacks && state->fallbacks->csi)
+      if((*state->fallbacks->csi)(leader, args, argcount, intermed, command, state->fbdata))
+        return 1;
+
+    return 0;
+  }
+
+  if(state->mode.origin) {
+    LBOUND(state->pos.row, state->scrollregion_top);
+    UBOUND(state->pos.row, SCROLLREGION_BOTTOM(state)-1);
+    LBOUND(state->pos.col, SCROLLREGION_LEFT(state));
+    UBOUND(state->pos.col, SCROLLREGION_RIGHT(state)-1);
+  }
+  else {
+    LBOUND(state->pos.row, 0);
+    UBOUND(state->pos.row, state->rows-1);
+    LBOUND(state->pos.col, 0);
+    UBOUND(state->pos.col, THISROWWIDTH(state)-1);
+  }
+
+  updatecursor(state, &oldpos, cancel_phantom);
+
+#ifdef DEBUG
+  if(state->pos.row < 0 || state->pos.row >= state->rows ||
+     state->pos.col < 0 || state->pos.col >= state->cols) {
+    fprintf(stderr, "Position out of bounds after CSI %c: (%d,%d)\n",
+        command, state->pos.row, state->pos.col);
+    abort();
+  }
+
+  if(SCROLLREGION_BOTTOM(state) <= state->scrollregion_top) {
+    fprintf(stderr, "Scroll region height out of bounds after CSI %c: %d <= %d\n",
+        command, SCROLLREGION_BOTTOM(state), state->scrollregion_top);
+    abort();
+  }
+
+  if(SCROLLREGION_RIGHT(state) <= SCROLLREGION_LEFT(state)) {
+    fprintf(stderr, "Scroll region width out of bounds after CSI %c: %d <= %d\n",
+        command, SCROLLREGION_RIGHT(state), SCROLLREGION_LEFT(state));
+    abort();
+  }
+#endif
+
+  return 1;
+}
+
+static char base64_one(uint8_t b)
+{
+  if(b < 26)
+    return 'A' + b;
+  else if(b < 52)
+    return 'a' + b - 26;
+  else if(b < 62)
+    return '0' + b - 52;
+  else if(b == 62)
+    return '+';
+  else if(b == 63)
+    return '/';
+  return 0;
+}
+
+static uint8_t unbase64one(char c)
+{
+  if(c >= 'A' && c <= 'Z')
+    return c - 'A';
+  else if(c >= 'a' && c <= 'z')
+    return c - 'a' + 26;
+  else if(c >= '0' && c <= '9')
+    return c - '0' + 52;
+  else if(c == '+')
+    return 62;
+  else if(c == '/')
+    return 63;
+
+  return 0xFF;
+}
+
+static void osc_selection(VTermState *state, VTermStringFragment frag)
+{
+  if(frag.initial) {
+    state->tmp.selection.mask = 0;
+    state->tmp.selection.state = SELECTION_INITIAL;
+  }
+
+  while(!state->tmp.selection.state && frag.len) {
+    /* Parse selection parameter */
+    switch(frag.str[0]) {
+      case 'c':
+        state->tmp.selection.mask |= VTERM_SELECTION_CLIPBOARD;
+        break;
+      case 'p':
+        state->tmp.selection.mask |= VTERM_SELECTION_PRIMARY;
+        break;
+      case 'q':
+        state->tmp.selection.mask |= VTERM_SELECTION_SECONDARY;
+        break;
+      case 's':
+        state->tmp.selection.mask |= VTERM_SELECTION_SELECT;
+        break;
+      case '0':
+      case '1':
+      case '2':
+      case '3':
+      case '4':
+      case '5':
+      case '6':
+      case '7':
+        state->tmp.selection.mask |= (VTERM_SELECTION_CUT0 << (frag.str[0] - '0'));
+        break;
+
+      case ';':
+        state->tmp.selection.state = SELECTION_SELECTED;
+        if(!state->tmp.selection.mask)
+          state->tmp.selection.mask = VTERM_SELECTION_SELECT|VTERM_SELECTION_CUT0;
+        break;
+    }
+
+    frag.str++;
+    frag.len--;
+  }
+
+  if(!frag.len)
+    return;
+
+  if(state->tmp.selection.state == SELECTION_SELECTED) {
+    if(frag.str[0] == '?') {
+      state->tmp.selection.state = SELECTION_QUERY;
+    }
+    else {
+      state->tmp.selection.state = SELECTION_SET_INITIAL;
+      state->tmp.selection.recvpartial = 0;
+    }
+  }
+
+  if(state->tmp.selection.state == SELECTION_QUERY) {
+    if(state->selection.callbacks->query)
+      (*state->selection.callbacks->query)(state->tmp.selection.mask, state->selection.user);
+    return;
+  }
+
+  if(state->selection.callbacks->set) {
+    size_t bufcur = 0;
+    char *buffer = state->selection.buffer;
+
+    uint32_t x = 0; /* Current decoding value */
+    int n = 0;      /* Number of sextets consumed */
+
+    if(state->tmp.selection.recvpartial) {
+      n = state->tmp.selection.recvpartial >> 24;
+      x = state->tmp.selection.recvpartial & 0x03FFFF; /* could be up to 18 bits of state in here */
+
+      state->tmp.selection.recvpartial = 0;
+    }
+
+    while((state->selection.buflen - bufcur) >= 3 && frag.len) {
+      if(frag.str[0] == '=') {
+        if(n == 2) {
+          buffer[0] = (x >> 4) & 0xFF;
+          buffer += 1, bufcur += 1;
+        }
+        if(n == 3) {
+          buffer[0] = (x >> 10) & 0xFF;
+          buffer[1] = (x >>  2) & 0xFF;
+          buffer += 2, bufcur += 2;
+        }
+
+        while(frag.len && frag.str[0] == '=')
+          frag.str++, frag.len--;
+
+        n = 0;
+      }
+      else {
+        uint8_t b = unbase64one(frag.str[0]);
+        if(b == 0xFF) {
+          DEBUG_LOG1("base64decode bad input %02X\n", (uint8_t)frag.str[0]);
+        }
+        else {
+          x = (x << 6) | b;
+          n++;
+        }
+        frag.str++, frag.len--;
+
+        if(n == 4) {
+          buffer[0] = (x >> 16) & 0xFF;
+          buffer[1] = (x >>  8) & 0xFF;
+          buffer[2] = (x >>  0) & 0xFF;
+
+          buffer += 3, bufcur += 3;
+          x = 0;
+          n = 0;
+        }
+      }
+
+      if(!frag.len || (state->selection.buflen - bufcur) < 3) {
+        if(bufcur) {
+	  VTermStringFragment setfrag = {
+	    state->selection.buffer, // str
+	    bufcur, // len
+	    state->tmp.selection.state == SELECTION_SET_INITIAL, // initial
+	    frag.final // final
+	  };
+          (*state->selection.callbacks->set)(state->tmp.selection.mask,
+	      setfrag, state->selection.user);
+          state->tmp.selection.state = SELECTION_SET;
+        }
+
+        buffer = state->selection.buffer;
+        bufcur = 0;
+      }
+    }
+
+    if(n)
+      state->tmp.selection.recvpartial = (n << 24) | x;
+  }
+}
+
+static int on_osc(int command, VTermStringFragment frag, void *user)
+{
+  VTermState *state = user;
+
+  switch(command) {
+    case 0:
+      settermprop_string(state, VTERM_PROP_ICONNAME, frag);
+      settermprop_string(state, VTERM_PROP_TITLE, frag);
+      return 1;
+
+    case 1:
+      settermprop_string(state, VTERM_PROP_ICONNAME, frag);
+      return 1;
+
+    case 2:
+      settermprop_string(state, VTERM_PROP_TITLE, frag);
+      return 1;
+
+    case 10:
+      {
+        // request foreground color: <Esc>]10;?<0x07>
+        int red = state->default_fg.red;
+        int blue = state->default_fg.blue;
+        int green = state->default_fg.green;
+        vterm_push_output_sprintf_ctrl(state->vt, C1_OSC, "10;rgb:%02x%02x/%02x%02x/%02x%02x\x07", red, red, green, green, blue, blue);
+        return 1;
+      }
+
+    case 11:
+      {
+	// request background color: <Esc>]11;?<0x07>
+	int red = state->default_bg.red;
+	int blue = state->default_bg.blue;
+	int green = state->default_bg.green;
+	vterm_push_output_sprintf_ctrl(state->vt, C1_OSC, "11;rgb:%02x%02x/%02x%02x/%02x%02x\x07", red, red, green, green, blue, blue);
+	return 1;
+      }
+    case 12:
+      settermprop_string(state, VTERM_PROP_CURSORCOLOR, frag);
+      return 1;
+
+    case 52:
+      if(state->selection.callbacks)
+        osc_selection(state, frag);
+
+      return 1;
+
+    default:
+      if(state->fallbacks && state->fallbacks->osc)
+        if((*state->fallbacks->osc)(command, frag, state->fbdata))
+          return 1;
+  }
+
+  return 0;
+}
+
+static void request_status_string(VTermState *state, VTermStringFragment frag)
+{
+  VTerm *vt = state->vt;
+
+  char *tmp = state->tmp.decrqss;
+
+  if(frag.initial)
+    tmp[0] = tmp[1] = tmp[2] = tmp[3] = 0;
+
+  size_t i = 0;
+  while(i < sizeof(state->tmp.decrqss)-1 && tmp[i])
+    i++;
+  while(i < sizeof(state->tmp.decrqss)-1 && frag.len--)
+    tmp[i++] = (frag.str++)[0];
+  tmp[i] = 0;
+
+  if(!frag.final)
+    return;
+
+  switch(tmp[0] | tmp[1]<<8 | tmp[2]<<16) {
+    case 'm': {
+      // Query SGR
+      long args[20];
+      int argc = vterm_state_getpen(state, args, sizeof(args)/sizeof(args[0]));
+      size_t cur = 0;
+
+      cur += SNPRINTF(vt->tmpbuffer + cur, vt->tmpbuffer_len - cur,
+          vt->mode.ctrl8bit ? "\x90" "1$r" : ESC_S "P" "1$r"); // DCS 1$r ...
+      if(cur >= vt->tmpbuffer_len)
+        return;
+
+      for(int argi = 0; argi < argc; argi++) {
+        cur += SNPRINTF(vt->tmpbuffer + cur, vt->tmpbuffer_len - cur,
+            argi == argc - 1             ? "%ld" :
+            CSI_ARG_HAS_MORE(args[argi]) ? "%ld:" :
+                                           "%ld;",
+            CSI_ARG(args[argi]));
+        if(cur >= vt->tmpbuffer_len)
+          return;
+      }
+
+      cur += SNPRINTF(vt->tmpbuffer + cur, vt->tmpbuffer_len - cur,
+          vt->mode.ctrl8bit ? "m" "\x9C" : "m" ESC_S "\\"); // ... m ST
+      if(cur >= vt->tmpbuffer_len)
+        return;
+
+      vterm_push_output_bytes(vt, vt->tmpbuffer, cur);
+      return;
+    }
+
+    case 'r':
+      // Query DECSTBM
+      vterm_push_output_sprintf_str(vt, C1_DCS, TRUE,
+          "1$r%d;%dr", state->scrollregion_top+1, SCROLLREGION_BOTTOM(state));
+      return;
+
+    case 's':
+      // Query DECSLRM
+      vterm_push_output_sprintf_str(vt, C1_DCS, TRUE,
+          "1$r%d;%ds", SCROLLREGION_LEFT(state)+1, SCROLLREGION_RIGHT(state));
+      return;
+
+    case ' '|('q'<<8): {
+      // Query DECSCUSR
+      int reply;
+      switch(state->mode.cursor_shape) {
+        case VTERM_PROP_CURSORSHAPE_BLOCK:     reply = 2; break;
+        case VTERM_PROP_CURSORSHAPE_UNDERLINE: reply = 4; break;
+	default: /* VTERM_PROP_CURSORSHAPE_BAR_LEFT */ reply = 6; break;
+      }
+      if(state->mode.cursor_blink)
+        reply--;
+      vterm_push_output_sprintf_str(vt, C1_DCS, TRUE,
+          "1$r%d q", reply);
+      return;
+    }
+
+    case '\"'|('q'<<8):
+      // Query DECSCA
+      vterm_push_output_sprintf_str(vt, C1_DCS, TRUE,
+          "1$r%d\"q", state->protected_cell ? 1 : 2);
+      return;
+  }
+
+  vterm_push_output_sprintf_str(state->vt, C1_DCS, TRUE, "0$r%s", tmp);
+}
+
+static int on_dcs(const char *command, size_t commandlen, VTermStringFragment frag, void *user)
+{
+  VTermState *state = user;
+
+  if(commandlen == 2 && strneq(command, "$q", 2)) {
+    request_status_string(state, frag);
+    return 1;
+  }
+  else if(state->fallbacks && state->fallbacks->dcs)
+    if((*state->fallbacks->dcs)(command, commandlen, frag, state->fbdata))
+      return 1;
+
+  DEBUG_LOG2("libvterm: Unhandled DCS %.*s\n", (int)commandlen, command);
+  return 0;
+}
+
+static int on_apc(VTermStringFragment frag, void *user)
+{
+  VTermState *state = user;
+
+  if(state->fallbacks && state->fallbacks->apc)
+    if((*state->fallbacks->apc)(frag, state->fbdata))
+      return 1;
+
+  /* No DEBUG_LOG because all APCs are unhandled */
+  return 0;
+}
+
+static int on_pm(VTermStringFragment frag, void *user)
+{
+  VTermState *state = user;
+
+  if(state->fallbacks && state->fallbacks->pm)
+    if((*state->fallbacks->pm)(frag, state->fbdata))
+      return 1;
+
+  /* No DEBUG_LOG because all PMs are unhandled */
+  return 0;
+}
+
+static int on_sos(VTermStringFragment frag, void *user)
+{
+  VTermState *state = user;
+
+  if(state->fallbacks && state->fallbacks->sos)
+    if((*state->fallbacks->sos)(frag, state->fbdata))
+      return 1;
+
+  /* No DEBUG_LOG because all SOSs are unhandled */
+  return 0;
+}
+
+static int on_resize(int rows, int cols, void *user)
+{
+  VTermState *state = user;
+  VTermPos oldpos = state->pos;
+
+  if(cols != state->cols) {
+    unsigned char *newtabstops = vterm_allocator_malloc(state->vt, (cols + 7) / 8);
+    if (newtabstops == NULL)
+      return 0;
+
+    /* TODO: This can all be done much more efficiently bytewise */
+    int col;
+    for(col = 0; col < state->cols && col < cols; col++) {
+      unsigned char mask = 1 << (col & 7);
+      if(state->tabstops[col >> 3] & mask)
+        newtabstops[col >> 3] |= mask;
+      else
+        newtabstops[col >> 3] &= ~mask;
+      }
+
+    for( ; col < cols; col++) {
+      unsigned char mask = 1 << (col & 7);
+      if(col % 8 == 0)
+        newtabstops[col >> 3] |= mask;
+      else
+        newtabstops[col >> 3] &= ~mask;
+    }
+
+    vterm_allocator_free(state->vt, state->tabstops);
+    state->tabstops = newtabstops;
+  }
+
+  state->rows = rows;
+  state->cols = cols;
+
+  if(state->scrollregion_bottom > -1)
+    UBOUND(state->scrollregion_bottom, state->rows);
+  if(state->scrollregion_right > -1)
+    UBOUND(state->scrollregion_right, state->cols);
+
+  VTermStateFields fields;
+  fields.pos = state->pos;
+  fields.lineinfos[0] = state->lineinfos[0];
+  fields.lineinfos[1] = state->lineinfos[1];
+
+  if(state->callbacks && state->callbacks->resize) {
+    (*state->callbacks->resize)(rows, cols, &fields, state->cbdata);
+    state->pos = fields.pos;
+
+    state->lineinfos[0] = fields.lineinfos[0];
+    state->lineinfos[1] = fields.lineinfos[1];
+  }
+  else {
+    if(rows != state->rows) {
+      for(int bufidx = BUFIDX_PRIMARY; bufidx <= BUFIDX_ALTSCREEN; bufidx++) {
+        VTermLineInfo *oldlineinfo = state->lineinfos[bufidx];
+        if(!oldlineinfo)
+          continue;
+
+        VTermLineInfo *newlineinfo = vterm_allocator_malloc(state->vt, rows * sizeof(VTermLineInfo));
+
+        int row;
+        for(row = 0; row < state->rows && row < rows; row++) {
+          newlineinfo[row] = oldlineinfo[row];
+        }
+
+        for( ; row < rows; row++) {
+          newlineinfo[row] = (VTermLineInfo){
+            .doublewidth = 0,
+          };
+        }
+
+        vterm_allocator_free(state->vt, state->lineinfos[bufidx]);
+        state->lineinfos[bufidx] = newlineinfo;
+      }
+    }
+  }
+
+  state->lineinfo = state->lineinfos[state->mode.alt_screen ? BUFIDX_ALTSCREEN : BUFIDX_PRIMARY];
+
+  if(state->at_phantom && state->pos.col < cols-1) {
+    state->at_phantom = 0;
+    state->pos.col++;
+  }
+
+  if(state->pos.row < 0)
+    state->pos.row = 0;
+  if(state->pos.row >= rows)
+    state->pos.row = rows - 1;
+  if(state->pos.col < 0)
+    state->pos.col = 0;
+  if(state->pos.col >= cols)
+    state->pos.col = cols - 1;
+
+  updatecursor(state, &oldpos, 1);
+
+  return 1;
+}
+
+static const VTermParserCallbacks parser_callbacks = {
+  on_text, // text
+  on_control, // control
+  on_escape, // escape
+  on_csi, // csi
+  on_osc, // osc
+  on_dcs, // dcs
+  on_apc, // apc
+  on_pm, // pm
+  on_sos, // sos
+  on_resize // resize
+};
+
+/*
+ * Return the existing state or create a new one.
+ * Returns NULL when out of memory.
+ */
+VTermState *vterm_obtain_state(VTerm *vt)
+{
+  if(vt->state)
+    return vt->state;
+
+  VTermState *state = vterm_state_new(vt);
+  if (state == NULL)
+    return NULL;
+  vt->state = state;
+
+  vterm_parser_set_callbacks(vt, &parser_callbacks, state);
+
+  return state;
+}
+
+void vterm_state_reset(VTermState *state, int hard)
+{
+  state->scrollregion_top = 0;
+  state->scrollregion_bottom = -1;
+  state->scrollregion_left = 0;
+  state->scrollregion_right = -1;
+
+  state->mode.keypad          = 0;
+  state->mode.cursor          = 0;
+  state->mode.autowrap        = 1;
+  state->mode.insert          = 0;
+  state->mode.newline         = 0;
+  state->mode.alt_screen      = 0;
+  state->mode.origin          = 0;
+  state->mode.leftrightmargin = 0;
+  state->mode.bracketpaste    = 0;
+  state->mode.report_focus    = 0;
+
+  state->mouse_flags = 0;
+
+  state->vt->mode.ctrl8bit   = 0;
+
+  for(int col = 0; col < state->cols; col++)
+    if(col % 8 == 0)
+      set_col_tabstop(state, col);
+    else
+      clear_col_tabstop(state, col);
+
+  for(int row = 0; row < state->rows; row++)
+    set_lineinfo(state, row, FORCE, DWL_OFF, DHL_OFF);
+
+  if(state->callbacks && state->callbacks->initpen)
+    (*state->callbacks->initpen)(state->cbdata);
+
+  vterm_state_resetpen(state);
+
+  VTermEncoding *default_enc = state->vt->mode.utf8 ?
+      vterm_lookup_encoding(ENC_UTF8,      'u') :
+      vterm_lookup_encoding(ENC_SINGLE_94, 'B');
+
+  for(int i = 0; i < 4; i++) {
+    state->encoding[i].enc = default_enc;
+    if(default_enc->init)
+      (*default_enc->init)(default_enc, state->encoding[i].data);
+  }
+
+  state->gl_set = 0;
+  state->gr_set = 1;
+  state->gsingle_set = 0;
+
+  state->protected_cell = 0;
+
+  // Initialise the props
+  settermprop_bool(state, VTERM_PROP_CURSORVISIBLE, 1);
+  settermprop_bool(state, VTERM_PROP_CURSORBLINK,   1);
+  settermprop_int (state, VTERM_PROP_CURSORSHAPE,   VTERM_PROP_CURSORSHAPE_BLOCK);
+
+  if(hard) {
+    state->pos.row = 0;
+    state->pos.col = 0;
+    state->at_phantom = 0;
+
+    VTermRect rect = { 0, 0, 0, 0 };
+    rect.end_row = state->rows;
+    rect.end_col =  state->cols;
+    erase(state, rect, 0);
+  }
+}
+
+void vterm_state_get_cursorpos(const VTermState *state, VTermPos *cursorpos)
+{
+  *cursorpos = state->pos;
+}
+
+void vterm_state_get_mousestate(const VTermState *state, VTermMouseState *mousestate)
+{
+  mousestate->pos.col = state->mouse_col;
+  mousestate->pos.row = state->mouse_row;
+  mousestate->buttons = state->mouse_buttons;
+  mousestate->flags = state->mouse_flags;
+}
+
+void vterm_state_set_callbacks(VTermState *state, const VTermStateCallbacks *callbacks, void *user)
+{
+  if(callbacks) {
+    state->callbacks = callbacks;
+    state->cbdata = user;
+
+    if(state->callbacks && state->callbacks->initpen)
+      (*state->callbacks->initpen)(state->cbdata);
+  }
+  else {
+    state->callbacks = NULL;
+    state->cbdata = NULL;
+  }
+}
+
+void *vterm_state_get_cbdata(VTermState *state)
+{
+  return state->cbdata;
+}
+
+void vterm_state_set_unrecognised_fallbacks(VTermState *state, const VTermStateFallbacks *fallbacks, void *user)
+{
+  if(fallbacks) {
+    state->fallbacks = fallbacks;
+    state->fbdata = user;
+  }
+  else {
+    state->fallbacks = NULL;
+    state->fbdata = NULL;
+  }
+}
+
+void *vterm_state_get_unrecognised_fbdata(VTermState *state)
+{
+  return state->fbdata;
+}
+
+int vterm_state_set_termprop(VTermState *state, VTermProp prop, VTermValue *val)
+{
+  /* Only store the new value of the property if usercode said it was happy.
+   * This is especially important for altscreen switching */
+  if(state->callbacks && state->callbacks->settermprop)
+    if(!(*state->callbacks->settermprop)(prop, val, state->cbdata))
+      return 0;
+
+  switch(prop) {
+  case VTERM_PROP_TITLE:
+  case VTERM_PROP_ICONNAME:
+  case VTERM_PROP_CURSORCOLOR:
+    // we don't store these, just transparently pass through
+    return 1;
+  case VTERM_PROP_CURSORVISIBLE:
+    state->mode.cursor_visible = val->boolean;
+    return 1;
+  case VTERM_PROP_CURSORBLINK:
+    state->mode.cursor_blink = val->boolean;
+    return 1;
+  case VTERM_PROP_CURSORSHAPE:
+    state->mode.cursor_shape = val->number;
+    return 1;
+  case VTERM_PROP_REVERSE:
+    state->mode.screen = val->boolean;
+    return 1;
+  case VTERM_PROP_ALTSCREEN:
+    state->mode.alt_screen = val->boolean;
+    state->lineinfo = state->lineinfos[state->mode.alt_screen ? BUFIDX_ALTSCREEN : BUFIDX_PRIMARY];
+    if(state->mode.alt_screen) {
+      VTermRect rect = {0, 0, 0, 0};
+      rect.end_row = state->rows;
+      rect.end_col = state->cols;
+      erase(state, rect, 0);
+    }
+    return 1;
+  case VTERM_PROP_MOUSE:
+    state->mouse_flags = 0;
+    if(val->number)
+      state->mouse_flags |= MOUSE_WANT_CLICK;
+    if(val->number == VTERM_PROP_MOUSE_DRAG)
+      state->mouse_flags |= MOUSE_WANT_DRAG;
+    if(val->number == VTERM_PROP_MOUSE_MOVE)
+      state->mouse_flags |= MOUSE_WANT_MOVE;
+    return 1;
+
+  case VTERM_N_PROPS:
+    return 0;
+  }
+
+  return 0;
+}
+
+void vterm_state_focus_in(VTermState *state)
+{
+  if(state->mode.report_focus)
+    vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "I");
+}
+
+void vterm_state_focus_out(VTermState *state)
+{
+  if(state->mode.report_focus)
+    vterm_push_output_sprintf_ctrl(state->vt, C1_CSI, "O");
+}
+
+const VTermLineInfo *vterm_state_get_lineinfo(const VTermState *state, int row)
+{
+  return state->lineinfo + row;
+}
+
+void vterm_state_set_selection_callbacks(VTermState *state, const VTermSelectionCallbacks *callbacks, void *user,
+    char *buffer, size_t buflen)
+{
+  if(buflen && !buffer)
+    buffer = vterm_allocator_malloc(state->vt, buflen);
+
+  state->selection.callbacks = callbacks;
+  state->selection.user      = user;
+  state->selection.buffer    = buffer;
+  state->selection.buflen    = buflen;
+}
+
+void vterm_state_send_selection(VTermState *state, VTermSelectionMask mask, VTermStringFragment frag)
+{
+  VTerm *vt = state->vt;
+
+  if(frag.initial) {
+    /* TODO: support sending more than one mask bit */
+    static char selection_chars[] = "cpqs";
+    int idx;
+    for(idx = 0; idx < 4; idx++)
+      if(mask & (1 << idx))
+        break;
+
+    vterm_push_output_sprintf_str(vt, C1_OSC, FALSE, "52;%c;", selection_chars[idx]);
+
+    state->tmp.selection.sendpartial = 0;
+  }
+
+  if(frag.len) {
+    size_t bufcur = 0;
+    char *buffer = state->selection.buffer;
+
+    uint32_t x = 0;
+    int n = 0;
+
+    if(state->tmp.selection.sendpartial) {
+      n = state->tmp.selection.sendpartial >> 24;
+      x = state->tmp.selection.sendpartial & 0xFFFFFF;
+
+      state->tmp.selection.sendpartial = 0;
+    }
+
+    while((state->selection.buflen - bufcur) >= 4 && frag.len) {
+      x = (x << 8) | frag.str[0];
+      n++;
+      frag.str++, frag.len--;
+
+      if(n == 3) {
+        buffer[0] = base64_one((x >> 18) & 0x3F);
+        buffer[1] = base64_one((x >> 12) & 0x3F);
+        buffer[2] = base64_one((x >>  6) & 0x3F);
+        buffer[3] = base64_one((x >>  0) & 0x3F);
+
+        buffer += 4, bufcur += 4;
+        x = 0;
+        n = 0;
+      }
+
+      if(!frag.len || (state->selection.buflen - bufcur) < 4) {
+        if(bufcur)
+          vterm_push_output_bytes(vt, state->selection.buffer, bufcur);
+
+        buffer = state->selection.buffer;
+        bufcur = 0;
+      }
+    }
+
+    if(n)
+      state->tmp.selection.sendpartial = (n << 24) | x;
+  }
+
+  if(frag.final) {
+    if(state->tmp.selection.sendpartial) {
+      int n      = state->tmp.selection.sendpartial >> 24;
+      uint32_t x = state->tmp.selection.sendpartial & 0xFFFFFF;
+      char *buffer = state->selection.buffer;
+
+      /* n is either 1 or 2 now */
+      x <<= (n == 1) ? 16 : 8;
+
+      buffer[0] = base64_one((x >> 18) & 0x3F);
+      buffer[1] = base64_one((x >> 12) & 0x3F);
+      buffer[2] = (n == 1) ? '=' : base64_one((x >>  6) & 0x3F);
+      buffer[3] = '=';
+
+      vterm_push_output_sprintf_str(vt, 0, TRUE, "%.*s", 4, buffer);
+    }
+    else
+      vterm_push_output_sprintf_str(vt, 0, TRUE, "");
+  }
+}
diff --git a/src/libvterm/src/unicode.c b/src/libvterm/src/unicode.c
new file mode 100644
index 0000000..a6a46e1
--- /dev/null
+++ b/src/libvterm/src/unicode.c
@@ -0,0 +1,587 @@
+#include "vterm_internal.h"
+
+// ### The following from http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
+// With modifications:
+//   made functions static
+//   moved 'combining' table to file scope, so other functions can see it
+// ###################################################################
+
+/*
+ * This is an implementation of wcwidth() and wcswidth() (defined in
+ * IEEE Std 1002.1-2001) for Unicode.
+ *
+ * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
+ * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
+ *
+ * In fixed-width output devices, Latin characters all occupy a single
+ * "cell" position of equal width, whereas ideographic CJK characters
+ * occupy two such cells. Interoperability between terminal-line
+ * applications and (teletype-style) character terminals using the
+ * UTF-8 encoding requires agreement on which character should advance
+ * the cursor by how many cell positions. No established formal
+ * standards exist at present on which Unicode character shall occupy
+ * how many cell positions on character terminals. These routines are
+ * a first attempt of defining such behavior based on simple rules
+ * applied to data provided by the Unicode Consortium.
+ *
+ * For some graphical characters, the Unicode standard explicitly
+ * defines a character-cell width via the definition of the East Asian
+ * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
+ * In all these cases, there is no ambiguity about which width a
+ * terminal shall use. For characters in the East Asian Ambiguous (A)
+ * class, the width choice depends purely on a preference of backward
+ * compatibility with either historic CJK or Western practice.
+ * Choosing single-width for these characters is easy to justify as
+ * the appropriate long-term solution, as the CJK practice of
+ * displaying these characters as double-width comes from historic
+ * implementation simplicity (8-bit encoded characters were displayed
+ * single-width and 16-bit ones double-width, even for Greek,
+ * Cyrillic, etc.) and not any typographic considerations.
+ *
+ * Much less clear is the choice of width for the Not East Asian
+ * (Neutral) class. Existing practice does not dictate a width for any
+ * of these characters. It would nevertheless make sense
+ * typographically to allocate two character cells to characters such
+ * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
+ * represented adequately with a single-width glyph. The following
+ * routines at present merely assign a single-cell width to all
+ * neutral characters, in the interest of simplicity. This is not
+ * entirely satisfactory and should be reconsidered before
+ * establishing a formal standard in this area. At the moment, the
+ * decision which Not East Asian (Neutral) characters should be
+ * represented by double-width glyphs cannot yet be answered by
+ * applying a simple rule from the Unicode database content. Setting
+ * up a proper standard for the behavior of UTF-8 character terminals
+ * will require a careful analysis not only of each Unicode character,
+ * but also of each presentation form, something the author of these
+ * routines has avoided to do so far.
+ *
+ * http://www.unicode.org/unicode/reports/tr11/
+ *
+ * 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
+ */
+
+struct interval {
+  int first;
+  int last;
+};
+
+#if !defined(WCWIDTH_FUNCTION) || !defined(IS_COMBINING_FUNCTION)
+
+/* sorted list of non-overlapping intervals of non-spacing characters */
+/* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
+// Replaced by the combining table from Vim.
+static const struct interval combining[] = {
+	{0X0300, 0X036F},
+	{0X0483, 0X0489},
+	{0X0591, 0X05BD},
+	{0X05BF, 0X05BF},
+	{0X05C1, 0X05C2},
+	{0X05C4, 0X05C5},
+	{0X05C7, 0X05C7},
+	{0X0610, 0X061A},
+	{0X064B, 0X065F},
+	{0X0670, 0X0670},
+	{0X06D6, 0X06DC},
+	{0X06DF, 0X06E4},
+	{0X06E7, 0X06E8},
+	{0X06EA, 0X06ED},
+	{0X0711, 0X0711},
+	{0X0730, 0X074A},
+	{0X07A6, 0X07B0},
+	{0X07EB, 0X07F3},
+	{0X07FD, 0X07FD},
+	{0X0816, 0X0819},
+	{0X081B, 0X0823},
+	{0X0825, 0X0827},
+	{0X0829, 0X082D},
+	{0X0859, 0X085B},
+	{0X08D3, 0X08E1},
+	{0X08E3, 0X0903},
+	{0X093A, 0X093C},
+	{0X093E, 0X094F},
+	{0X0951, 0X0957},
+	{0X0962, 0X0963},
+	{0X0981, 0X0983},
+	{0X09BC, 0X09BC},
+	{0X09BE, 0X09C4},
+	{0X09C7, 0X09C8},
+	{0X09CB, 0X09CD},
+	{0X09D7, 0X09D7},
+	{0X09E2, 0X09E3},
+	{0X09FE, 0X09FE},
+	{0X0A01, 0X0A03},
+	{0X0A3C, 0X0A3C},
+	{0X0A3E, 0X0A42},
+	{0X0A47, 0X0A48},
+	{0X0A4B, 0X0A4D},
+	{0X0A51, 0X0A51},
+	{0X0A70, 0X0A71},
+	{0X0A75, 0X0A75},
+	{0X0A81, 0X0A83},
+	{0X0ABC, 0X0ABC},
+	{0X0ABE, 0X0AC5},
+	{0X0AC7, 0X0AC9},
+	{0X0ACB, 0X0ACD},
+	{0X0AE2, 0X0AE3},
+	{0X0AFA, 0X0AFF},
+	{0X0B01, 0X0B03},
+	{0X0B3C, 0X0B3C},
+	{0X0B3E, 0X0B44},
+	{0X0B47, 0X0B48},
+	{0X0B4B, 0X0B4D},
+	{0X0B56, 0X0B57},
+	{0X0B62, 0X0B63},
+	{0X0B82, 0X0B82},
+	{0X0BBE, 0X0BC2},
+	{0X0BC6, 0X0BC8},
+	{0X0BCA, 0X0BCD},
+	{0X0BD7, 0X0BD7},
+	{0X0C00, 0X0C04},
+	{0X0C3E, 0X0C44},
+	{0X0C46, 0X0C48},
+	{0X0C4A, 0X0C4D},
+	{0X0C55, 0X0C56},
+	{0X0C62, 0X0C63},
+	{0X0C81, 0X0C83},
+	{0X0CBC, 0X0CBC},
+	{0X0CBE, 0X0CC4},
+	{0X0CC6, 0X0CC8},
+	{0X0CCA, 0X0CCD},
+	{0X0CD5, 0X0CD6},
+	{0X0CE2, 0X0CE3},
+	{0X0D00, 0X0D03},
+	{0X0D3B, 0X0D3C},
+	{0X0D3E, 0X0D44},
+	{0X0D46, 0X0D48},
+	{0X0D4A, 0X0D4D},
+	{0X0D57, 0X0D57},
+	{0X0D62, 0X0D63},
+	{0X0D82, 0X0D83},
+	{0X0DCA, 0X0DCA},
+	{0X0DCF, 0X0DD4},
+	{0X0DD6, 0X0DD6},
+	{0X0DD8, 0X0DDF},
+	{0X0DF2, 0X0DF3},
+	{0X0E31, 0X0E31},
+	{0X0E34, 0X0E3A},
+	{0X0E47, 0X0E4E},
+	{0X0EB1, 0X0EB1},
+	{0X0EB4, 0X0EBC},
+	{0X0EC8, 0X0ECD},
+	{0X0F18, 0X0F19},
+	{0X0F35, 0X0F35},
+	{0X0F37, 0X0F37},
+	{0X0F39, 0X0F39},
+	{0X0F3E, 0X0F3F},
+	{0X0F71, 0X0F84},
+	{0X0F86, 0X0F87},
+	{0X0F8D, 0X0F97},
+	{0X0F99, 0X0FBC},
+	{0X0FC6, 0X0FC6},
+	{0X102B, 0X103E},
+	{0X1056, 0X1059},
+	{0X105E, 0X1060},
+	{0X1062, 0X1064},
+	{0X1067, 0X106D},
+	{0X1071, 0X1074},
+	{0X1082, 0X108D},
+	{0X108F, 0X108F},
+	{0X109A, 0X109D},
+	{0X135D, 0X135F},
+	{0X1712, 0X1714},
+	{0X1732, 0X1734},
+	{0X1752, 0X1753},
+	{0X1772, 0X1773},
+	{0X17B4, 0X17D3},
+	{0X17DD, 0X17DD},
+	{0X180B, 0X180D},
+	{0X1885, 0X1886},
+	{0X18A9, 0X18A9},
+	{0X1920, 0X192B},
+	{0X1930, 0X193B},
+	{0X1A17, 0X1A1B},
+	{0X1A55, 0X1A5E},
+	{0X1A60, 0X1A7C},
+	{0X1A7F, 0X1A7F},
+	{0X1AB0, 0X1ABE},
+	{0X1B00, 0X1B04},
+	{0X1B34, 0X1B44},
+	{0X1B6B, 0X1B73},
+	{0X1B80, 0X1B82},
+	{0X1BA1, 0X1BAD},
+	{0X1BE6, 0X1BF3},
+	{0X1C24, 0X1C37},
+	{0X1CD0, 0X1CD2},
+	{0X1CD4, 0X1CE8},
+	{0X1CED, 0X1CED},
+	{0X1CF4, 0X1CF4},
+	{0X1CF7, 0X1CF9},
+	{0X1DC0, 0X1DF9},
+	{0X1DFB, 0X1DFF},
+	{0X20D0, 0X20F0},
+	{0X2CEF, 0X2CF1},
+	{0X2D7F, 0X2D7F},
+	{0X2DE0, 0X2DFF},
+	{0X302A, 0X302F},
+	{0X3099, 0X309A},
+	{0XA66F, 0XA672},
+	{0XA674, 0XA67D},
+	{0XA69E, 0XA69F},
+	{0XA6F0, 0XA6F1},
+	{0XA802, 0XA802},
+	{0XA806, 0XA806},
+	{0XA80B, 0XA80B},
+	{0XA823, 0XA827},
+	{0XA880, 0XA881},
+	{0XA8B4, 0XA8C5},
+	{0XA8E0, 0XA8F1},
+	{0XA8FF, 0XA8FF},
+	{0XA926, 0XA92D},
+	{0XA947, 0XA953},
+	{0XA980, 0XA983},
+	{0XA9B3, 0XA9C0},
+	{0XA9E5, 0XA9E5},
+	{0XAA29, 0XAA36},
+	{0XAA43, 0XAA43},
+	{0XAA4C, 0XAA4D},
+	{0XAA7B, 0XAA7D},
+	{0XAAB0, 0XAAB0},
+	{0XAAB2, 0XAAB4},
+	{0XAAB7, 0XAAB8},
+	{0XAABE, 0XAABF},
+	{0XAAC1, 0XAAC1},
+	{0XAAEB, 0XAAEF},
+	{0XAAF5, 0XAAF6},
+	{0XABE3, 0XABEA},
+	{0XABEC, 0XABED},
+	{0XFB1E, 0XFB1E},
+	{0XFE00, 0XFE0F},
+	{0XFE20, 0XFE2F},
+	{0X101FD, 0X101FD},
+	{0X102E0, 0X102E0},
+	{0X10376, 0X1037A},
+	{0X10A01, 0X10A03},
+	{0X10A05, 0X10A06},
+	{0X10A0C, 0X10A0F},
+	{0X10A38, 0X10A3A},
+	{0X10A3F, 0X10A3F},
+	{0X10AE5, 0X10AE6},
+	{0X10D24, 0X10D27},
+	{0X10F46, 0X10F50},
+	{0X11000, 0X11002},
+	{0X11038, 0X11046},
+	{0X1107F, 0X11082},
+	{0X110B0, 0X110BA},
+	{0X11100, 0X11102},
+	{0X11127, 0X11134},
+	{0X11145, 0X11146},
+	{0X11173, 0X11173},
+	{0X11180, 0X11182},
+	{0X111B3, 0X111C0},
+	{0X111C9, 0X111CC},
+	{0X1122C, 0X11237},
+	{0X1123E, 0X1123E},
+	{0X112DF, 0X112EA},
+	{0X11300, 0X11303},
+	{0X1133B, 0X1133C},
+	{0X1133E, 0X11344},
+	{0X11347, 0X11348},
+	{0X1134B, 0X1134D},
+	{0X11357, 0X11357},
+	{0X11362, 0X11363},
+	{0X11366, 0X1136C},
+	{0X11370, 0X11374},
+	{0X11435, 0X11446},
+	{0X1145E, 0X1145E},
+	{0X114B0, 0X114C3},
+	{0X115AF, 0X115B5},
+	{0X115B8, 0X115C0},
+	{0X115DC, 0X115DD},
+	{0X11630, 0X11640},
+	{0X116AB, 0X116B7},
+	{0X1171D, 0X1172B},
+	{0X1182C, 0X1183A},
+	{0X119D1, 0X119D7},
+	{0X119DA, 0X119E0},
+	{0X119E4, 0X119E4},
+	{0X11A01, 0X11A0A},
+	{0X11A33, 0X11A39},
+	{0X11A3B, 0X11A3E},
+	{0X11A47, 0X11A47},
+	{0X11A51, 0X11A5B},
+	{0X11A8A, 0X11A99},
+	{0X11C2F, 0X11C36},
+	{0X11C38, 0X11C3F},
+	{0X11C92, 0X11CA7},
+	{0X11CA9, 0X11CB6},
+	{0X11D31, 0X11D36},
+	{0X11D3A, 0X11D3A},
+	{0X11D3C, 0X11D3D},
+	{0X11D3F, 0X11D45},
+	{0X11D47, 0X11D47},
+	{0X11D8A, 0X11D8E},
+	{0X11D90, 0X11D91},
+	{0X11D93, 0X11D97},
+	{0X11EF3, 0X11EF6},
+	{0X16AF0, 0X16AF4},
+	{0X16B30, 0X16B36},
+	{0X16F4F, 0X16F4F},
+	{0X16F51, 0X16F87},
+	{0X16F8F, 0X16F92},
+	{0X1BC9D, 0X1BC9E},
+	{0X1D165, 0X1D169},
+	{0X1D16D, 0X1D172},
+	{0X1D17B, 0X1D182},
+	{0X1D185, 0X1D18B},
+	{0X1D1AA, 0X1D1AD},
+	{0X1D242, 0X1D244},
+	{0X1DA00, 0X1DA36},
+	{0X1DA3B, 0X1DA6C},
+	{0X1DA75, 0X1DA75},
+	{0X1DA84, 0X1DA84},
+	{0X1DA9B, 0X1DA9F},
+	{0X1DAA1, 0X1DAAF},
+	{0X1E000, 0X1E006},
+	{0X1E008, 0X1E018},
+	{0X1E01B, 0X1E021},
+	{0X1E023, 0X1E024},
+	{0X1E026, 0X1E02A},
+	{0X1E130, 0X1E136},
+	{0X1E2EC, 0X1E2EF},
+	{0X1E8D0, 0X1E8D6},
+	{0X1E944, 0X1E94A},
+	{0XE0100, 0XE01EF}
+};
+#endif
+
+/* auxiliary function for binary search in interval table */
+static int bisearch(uint32_t ucs, const struct interval *table, int max) {
+  int min = 0;
+  int mid;
+
+  if ((int)ucs < table[0].first || (int)ucs > table[max].last)
+    return 0;
+  while (max >= min) {
+    mid = (min + max) / 2;
+    if ((int)ucs > table[mid].last)
+      min = mid + 1;
+    else if ((int)ucs < table[mid].first)
+      max = mid - 1;
+    else
+      return 1;
+  }
+
+  return 0;
+}
+
+
+/* The following two functions define the column width of an ISO 10646
+ * character as follows:
+ *
+ *    - The null character (U+0000) has a column width of 0.
+ *
+ *    - Other C0/C1 control characters and DEL will lead to a return
+ *      value of -1.
+ *
+ *    - Non-spacing and enclosing combining characters (general
+ *      category code Mn or Me in the Unicode database) have a
+ *      column width of 0.
+ *
+ *    - SOFT HYPHEN (U+00AD) has a column width of 1.
+ *
+ *    - Other format characters (general category code Cf in the Unicode
+ *      database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
+ *
+ *    - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
+ *      have a column width of 0.
+ *
+ *    - Spacing characters in the East Asian Wide (W) or East Asian
+ *      Full-width (F) category as defined in Unicode Technical
+ *      Report #11 have a column width of 2.
+ *
+ *    - All remaining characters (including all printable
+ *      ISO 8859-1 and WGL4 characters, Unicode control characters,
+ *      etc.) have a column width of 1.
+ *
+ * This implementation assumes that uint32_t characters are encoded
+ * in ISO 10646.
+ */
+
+#ifdef WCWIDTH_FUNCTION
+// use a provided wcwidth() function
+int WCWIDTH_FUNCTION(uint32_t ucs);
+#else
+# define WCWIDTH_FUNCTION mk_wcwidth
+
+static int mk_wcwidth(uint32_t ucs)
+{
+  /* 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)));
+}
+#endif
+
+/* sorted list of non-overlapping intervals of East Asian Ambiguous
+* characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
+static const struct interval ambiguous[] = {
+{ 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
+{ 0x00AA, 0x00AA }, { 0x00AE, 0x00AE }, { 0x00B0, 0x00B4 },
+{ 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 },
+{ 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 },
+{ 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED },
+{ 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA },
+{ 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 },
+{ 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B },
+{ 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 },
+{ 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 },
+{ 0x0148, 0x014B }, { 0x014D, 0x014D }, { 0x0152, 0x0153 },
+{ 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE },
+{ 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 },
+{ 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA },
+{ 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 },
+{ 0x02C4, 0x02C4 }, { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB },
+{ 0x02CD, 0x02CD }, { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB },
+{ 0x02DD, 0x02DD }, { 0x02DF, 0x02DF }, { 0x0391, 0x03A1 },
+{ 0x03A3, 0x03A9 }, { 0x03B1, 0x03C1 }, { 0x03C3, 0x03C9 },
+{ 0x0401, 0x0401 }, { 0x0410, 0x044F }, { 0x0451, 0x0451 },
+{ 0x2010, 0x2010 }, { 0x2013, 0x2016 }, { 0x2018, 0x2019 },
+{ 0x201C, 0x201D }, { 0x2020, 0x2022 }, { 0x2024, 0x2027 },
+{ 0x2030, 0x2030 }, { 0x2032, 0x2033 }, { 0x2035, 0x2035 },
+{ 0x203B, 0x203B }, { 0x203E, 0x203E }, { 0x2074, 0x2074 },
+{ 0x207F, 0x207F }, { 0x2081, 0x2084 }, { 0x20AC, 0x20AC },
+{ 0x2103, 0x2103 }, { 0x2105, 0x2105 }, { 0x2109, 0x2109 },
+{ 0x2113, 0x2113 }, { 0x2116, 0x2116 }, { 0x2121, 0x2122 },
+{ 0x2126, 0x2126 }, { 0x212B, 0x212B }, { 0x2153, 0x2154 },
+{ 0x215B, 0x215E }, { 0x2160, 0x216B }, { 0x2170, 0x2179 },
+{ 0x2190, 0x2199 }, { 0x21B8, 0x21B9 }, { 0x21D2, 0x21D2 },
+{ 0x21D4, 0x21D4 }, { 0x21E7, 0x21E7 }, { 0x2200, 0x2200 },
+{ 0x2202, 0x2203 }, { 0x2207, 0x2208 }, { 0x220B, 0x220B },
+{ 0x220F, 0x220F }, { 0x2211, 0x2211 }, { 0x2215, 0x2215 },
+{ 0x221A, 0x221A }, { 0x221D, 0x2220 }, { 0x2223, 0x2223 },
+{ 0x2225, 0x2225 }, { 0x2227, 0x222C }, { 0x222E, 0x222E },
+{ 0x2234, 0x2237 }, { 0x223C, 0x223D }, { 0x2248, 0x2248 },
+{ 0x224C, 0x224C }, { 0x2252, 0x2252 }, { 0x2260, 0x2261 },
+{ 0x2264, 0x2267 }, { 0x226A, 0x226B }, { 0x226E, 0x226F },
+{ 0x2282, 0x2283 }, { 0x2286, 0x2287 }, { 0x2295, 0x2295 },
+{ 0x2299, 0x2299 }, { 0x22A5, 0x22A5 }, { 0x22BF, 0x22BF },
+{ 0x2312, 0x2312 }, { 0x2460, 0x24E9 }, { 0x24EB, 0x254B },
+{ 0x2550, 0x2573 }, { 0x2580, 0x258F }, { 0x2592, 0x2595 },
+{ 0x25A0, 0x25A1 }, { 0x25A3, 0x25A9 }, { 0x25B2, 0x25B3 },
+{ 0x25B6, 0x25B7 }, { 0x25BC, 0x25BD }, { 0x25C0, 0x25C1 },
+{ 0x25C6, 0x25C8 }, { 0x25CB, 0x25CB }, { 0x25CE, 0x25D1 },
+{ 0x25E2, 0x25E5 }, { 0x25EF, 0x25EF }, { 0x2605, 0x2606 },
+{ 0x2609, 0x2609 }, { 0x260E, 0x260F }, { 0x2614, 0x2615 },
+{ 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 },
+{ 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 },
+{ 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F },
+{ 0x273D, 0x273D }, { 0x2776, 0x277F }, { 0xE000, 0xF8FF },
+{ 0xFFFD, 0xFFFD }, { 0xF0000, 0xFFFFD }, { 0x100000, 0x10FFFD }
+};
+
+#ifdef USE_MK_WCWIDTH_CJK
+
+/*
+ * The following functions are the same as mk_wcwidth() and
+ * mk_wcswidth(), except that spacing characters in the East Asian
+ * Ambiguous (A) category as defined in Unicode Technical Report #11
+ * have a column width of 2. This variant might be useful for users of
+ * CJK legacy encodings who want to migrate to UCS without changing
+ * the traditional terminal character-width behaviour. It is not
+ * otherwise recommended for general use.
+ */
+static int mk_wcwidth_cjk(uint32_t ucs)
+{
+  /* binary search in table of non-spacing characters */
+  if (bisearch(ucs, ambiguous,
+               sizeof(ambiguous) / sizeof(struct interval) - 1))
+    return 2;
+
+  return mk_wcwidth(ucs);
+}
+
+#endif
+
+INTERNAL int vterm_unicode_is_ambiguous(uint32_t codepoint)
+{
+  return (bisearch(codepoint, ambiguous,
+               sizeof(ambiguous) / sizeof(struct interval) - 1)) ? 1 : 0;
+}
+
+#ifdef IS_COMBINING_FUNCTION
+// Use a provided is_combining() function.
+int IS_COMBINING_FUNCTION(uint32_t codepoint);
+#else
+# define IS_COMBINING_FUNCTION vterm_is_combining
+	static int
+vterm_is_combining(uint32_t codepoint)
+{
+  return bisearch(codepoint, combining, sizeof(combining) / sizeof(struct interval) - 1);
+}
+#endif
+
+#ifdef GET_SPECIAL_PTY_TYPE_FUNCTION
+int GET_SPECIAL_PTY_TYPE_FUNCTION(void);
+#else
+# define GET_SPECIAL_PTY_TYPE_FUNCTION vterm_get_special_pty_type_placeholder
+	static int
+vterm_get_special_pty_type_placeholder(void)
+{
+  return 0;
+}
+#endif
+
+// ################################
+// ### The rest added by Paul Evans
+
+static const struct interval fullwidth[] = {
+#include "fullwidth.inc"
+};
+
+INTERNAL int vterm_unicode_width(uint32_t codepoint)
+{
+  if(bisearch(codepoint, fullwidth, sizeof(fullwidth) / sizeof(fullwidth[0]) - 1))
+    return 2;
+
+  return WCWIDTH_FUNCTION(codepoint);
+}
+
+INTERNAL int vterm_unicode_is_combining(uint32_t codepoint)
+{
+  return IS_COMBINING_FUNCTION(codepoint);
+}
+
+INTERNAL int vterm_get_special_pty_type(void)
+{
+  return GET_SPECIAL_PTY_TYPE_FUNCTION();
+}
diff --git a/src/libvterm/src/utf8.h b/src/libvterm/src/utf8.h
new file mode 100644
index 0000000..886a1ca
--- /dev/null
+++ b/src/libvterm/src/utf8.h
@@ -0,0 +1,47 @@
+/* The following functions copied and adapted from libtermkey
+ *
+ * http://www.leonerd.org.uk/code/libtermkey/
+ */
+unsigned int utf8_seqlen(long codepoint);
+
+#if defined(DEFINE_INLINES) || USE_INLINE
+INLINE unsigned int utf8_seqlen(long codepoint)
+{
+  if(codepoint < 0x0000080) return 1;
+  if(codepoint < 0x0000800) return 2;
+  if(codepoint < 0x0010000) return 3;
+  if(codepoint < 0x0200000) return 4;
+  if(codepoint < 0x4000000) return 5;
+  return 6;
+}
+#endif
+
+/* Does NOT NUL-terminate the buffer */
+int fill_utf8(long codepoint, char *str);
+
+#if defined(DEFINE_INLINES) || USE_INLINE
+INLINE int fill_utf8(long codepoint, char *str)
+{
+  int nbytes = utf8_seqlen(codepoint);
+
+  // This is easier done backwards
+  int b = nbytes;
+  while(b > 1) {
+    b--;
+    str[b] = 0x80 | (codepoint & 0x3f);
+    codepoint >>= 6;
+  }
+
+  switch(nbytes) {
+    case 1: str[0] =        (codepoint & 0x7f); break;
+    case 2: str[0] = 0xc0 | (codepoint & 0x1f); break;
+    case 3: str[0] = 0xe0 | (codepoint & 0x0f); break;
+    case 4: str[0] = 0xf0 | (codepoint & 0x07); break;
+    case 5: str[0] = 0xf8 | (codepoint & 0x03); break;
+    case 6: str[0] = 0xfc | (codepoint & 0x01); break;
+  }
+
+  return nbytes;
+}
+#endif
+/* end copy */
diff --git a/src/libvterm/src/vterm.c b/src/libvterm/src/vterm.c
new file mode 100644
index 0000000..ed6d21b
--- /dev/null
+++ b/src/libvterm/src/vterm.c
@@ -0,0 +1,451 @@
+#define DEFINE_INLINES
+
+// vim: set sw=2 :
+#include "vterm_internal.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <string.h>
+
+#include "utf8.h"
+
+/*****************
+ * API functions *
+ *****************/
+
+static void *default_malloc(size_t size, void *allocdata UNUSED)
+{
+  void *ptr = malloc(size);
+  if(ptr)
+    memset(ptr, 0, size);
+  return ptr;
+}
+
+static void default_free(void *ptr, void *allocdata UNUSED)
+{
+  free(ptr);
+}
+
+static VTermAllocatorFunctions default_allocator = {
+  &default_malloc, // malloc
+  &default_free // free
+};
+
+VTerm *vterm_new(int rows, int cols)
+{
+  struct VTermBuilder builder;
+  memset(&builder, 0, sizeof(builder));
+  builder.rows = rows;
+  builder.cols = cols;
+  return vterm_build(&builder);
+}
+
+VTerm *vterm_new_with_allocator(int rows, int cols, VTermAllocatorFunctions *funcs, void *allocdata)
+{
+  struct VTermBuilder builder;
+  memset(&builder, 0, sizeof(builder));
+  builder.rows = rows;
+  builder.cols = cols;
+  builder.allocator = funcs;
+  builder.allocdata = allocdata;
+  return vterm_build(&builder);
+}
+
+/* A handy macro for defaulting values out of builder fields */
+#define DEFAULT(v, def)  ((v) ? (v) : (def))
+
+VTerm *vterm_build(const struct VTermBuilder *builder)
+{
+  const VTermAllocatorFunctions *allocator = DEFAULT(builder->allocator, &default_allocator);
+
+  /* Need to bootstrap using the allocator function directly */
+  VTerm *vt = (*allocator->malloc)(sizeof(VTerm), builder->allocdata);
+
+  vt->allocator = allocator;
+  vt->allocdata = builder->allocdata;
+
+  vt->rows = builder->rows;
+  vt->cols = builder->cols;
+
+  vt->parser.state = NORMAL;
+
+  vt->parser.callbacks = NULL;
+  vt->parser.cbdata    = NULL;
+
+  vt->outfunc = NULL;
+  vt->outdata = NULL;
+
+  vt->outbuffer_len = DEFAULT(builder->outbuffer_len, 4096);
+  vt->outbuffer_cur = 0;
+  vt->outbuffer = vterm_allocator_malloc(vt, vt->outbuffer_len);
+
+  vt->tmpbuffer_len = DEFAULT(builder->tmpbuffer_len, 4096);
+  vt->tmpbuffer = vterm_allocator_malloc(vt, vt->tmpbuffer_len);
+
+  if (vt->tmpbuffer == NULL
+      || vt->outbuffer == NULL
+      || vt->tmpbuffer == NULL)
+  {
+    vterm_allocator_free(vt, vt->outbuffer);
+    vterm_allocator_free(vt, vt->tmpbuffer);
+    vterm_allocator_free(vt, vt);
+    return NULL;
+  }
+
+  return vt;
+}
+
+void vterm_free(VTerm *vt)
+{
+  if(vt->screen)
+    vterm_screen_free(vt->screen);
+
+  if(vt->state)
+    vterm_state_free(vt->state);
+
+  vterm_allocator_free(vt, vt->outbuffer);
+  vterm_allocator_free(vt, vt->tmpbuffer);
+
+  vterm_allocator_free(vt, vt);
+}
+
+INTERNAL void *vterm_allocator_malloc(VTerm *vt, size_t size)
+{
+  return (*vt->allocator->malloc)(size, vt->allocdata);
+}
+
+/*
+ * Free "ptr" unless it is NULL.
+ */
+INTERNAL void vterm_allocator_free(VTerm *vt, void *ptr)
+{
+  if (ptr)
+    (*vt->allocator->free)(ptr, vt->allocdata);
+}
+
+void vterm_get_size(const VTerm *vt, int *rowsp, int *colsp)
+{
+  if(rowsp)
+    *rowsp = vt->rows;
+  if(colsp)
+    *colsp = vt->cols;
+}
+
+void vterm_set_size(VTerm *vt, int rows, int cols)
+{
+  if(rows < 1 || cols < 1)
+    return;
+
+  vt->rows = rows;
+  vt->cols = cols;
+
+  if(vt->parser.callbacks && vt->parser.callbacks->resize)
+    (*vt->parser.callbacks->resize)(rows, cols, vt->parser.cbdata);
+}
+
+int vterm_get_utf8(const VTerm *vt)
+{
+  return vt->mode.utf8;
+}
+
+void vterm_set_utf8(VTerm *vt, int is_utf8)
+{
+  vt->mode.utf8 = is_utf8;
+}
+
+void vterm_output_set_callback(VTerm *vt, VTermOutputCallback *func, void *user)
+{
+  vt->outfunc = func;
+  vt->outdata = user;
+}
+
+INTERNAL void vterm_push_output_bytes(VTerm *vt, const char *bytes, size_t len)
+{
+  if(vt->outfunc) {
+    (vt->outfunc)(bytes, len, vt->outdata);
+    return;
+  }
+
+  if(len > vt->outbuffer_len - vt->outbuffer_cur) {
+    DEBUG_LOG("vterm_push_output_bytes(): buffer overflow; dropping output\n");
+    return;
+  }
+
+  memcpy(vt->outbuffer + vt->outbuffer_cur, bytes, len);
+  vt->outbuffer_cur += len;
+}
+
+INTERNAL void vterm_push_output_vsprintf(VTerm *vt, const char *format, va_list args)
+{
+  size_t len;
+#ifndef VSNPRINTF
+  // When vsnprintf() is not available (C90) fall back to vsprintf().
+  char buffer[1024]; // 1Kbyte is enough for everybody, right?
+#endif
+
+#ifdef VSNPRINTF
+  len = VSNPRINTF(vt->tmpbuffer, vt->tmpbuffer_len, format, args);
+  vterm_push_output_bytes(vt, vt->tmpbuffer, len);
+#else
+  len = vsprintf(buffer, format, args);
+  vterm_push_output_bytes(vt, buffer, len);
+#endif
+}
+
+INTERNAL void vterm_push_output_sprintf(VTerm *vt, const char *format, ...)
+{
+  va_list args;
+  va_start(args, format);
+  vterm_push_output_vsprintf(vt, format, args);
+  va_end(args);
+}
+
+INTERNAL void vterm_push_output_sprintf_ctrl(VTerm *vt, unsigned char ctrl, const char *fmt, ...)
+{
+  size_t cur;
+
+  if(ctrl >= 0x80 && !vt->mode.ctrl8bit)
+    cur = SNPRINTF(vt->tmpbuffer, vt->tmpbuffer_len,
+        ESC_S "%c", ctrl - 0x40);
+  else
+    cur = SNPRINTF(vt->tmpbuffer, vt->tmpbuffer_len,
+        "%c", ctrl);
+  if(cur >= vt->tmpbuffer_len)
+    return;
+  vterm_push_output_bytes(vt, vt->tmpbuffer, cur);
+
+  va_list args;
+  va_start(args, fmt);
+  vterm_push_output_vsprintf(vt, fmt, args);
+  va_end(args);
+}
+
+INTERNAL void vterm_push_output_sprintf_str(VTerm *vt, unsigned char ctrl, int term, const char *fmt, ...)
+{
+  size_t cur;
+
+  if(ctrl) {
+    if(ctrl >= 0x80 && !vt->mode.ctrl8bit)
+      cur = SNPRINTF(vt->tmpbuffer, vt->tmpbuffer_len,
+          ESC_S "%c", ctrl - 0x40);
+    else
+      cur = SNPRINTF(vt->tmpbuffer, vt->tmpbuffer_len,
+          "%c", ctrl);
+
+    if(cur >= vt->tmpbuffer_len)
+      return;
+    vterm_push_output_bytes(vt, vt->tmpbuffer, cur);
+  }
+
+  va_list args;
+  va_start(args, fmt);
+  vterm_push_output_vsprintf(vt, fmt, args);
+  va_end(args);
+
+  if(term) {
+    cur = SNPRINTF(vt->tmpbuffer, vt->tmpbuffer_len,
+        vt->mode.ctrl8bit ? "\x9C" : ESC_S "\\"); // ST
+    if(cur >= vt->tmpbuffer_len)
+      return;
+    vterm_push_output_bytes(vt, vt->tmpbuffer, cur);
+  }
+}
+
+size_t vterm_output_get_buffer_size(const VTerm *vt)
+{
+  return vt->outbuffer_len;
+}
+
+size_t vterm_output_get_buffer_current(const VTerm *vt)
+{
+  return vt->outbuffer_cur;
+}
+
+size_t vterm_output_get_buffer_remaining(const VTerm *vt)
+{
+  return vt->outbuffer_len - vt->outbuffer_cur;
+}
+
+size_t vterm_output_read(VTerm *vt, char *buffer, size_t len)
+{
+  if(len > vt->outbuffer_cur)
+    len = vt->outbuffer_cur;
+
+  memcpy(buffer, vt->outbuffer, len);
+
+  if(len < vt->outbuffer_cur)
+    memmove(vt->outbuffer, vt->outbuffer + len, vt->outbuffer_cur - len);
+
+  vt->outbuffer_cur -= len;
+
+  return len;
+}
+
+VTermValueType vterm_get_attr_type(VTermAttr attr)
+{
+  switch(attr) {
+    case VTERM_ATTR_BOLD:       return VTERM_VALUETYPE_BOOL;
+    case VTERM_ATTR_UNDERLINE:  return VTERM_VALUETYPE_INT;
+    case VTERM_ATTR_ITALIC:     return VTERM_VALUETYPE_BOOL;
+    case VTERM_ATTR_BLINK:      return VTERM_VALUETYPE_BOOL;
+    case VTERM_ATTR_REVERSE:    return VTERM_VALUETYPE_BOOL;
+    case VTERM_ATTR_CONCEAL:    return VTERM_VALUETYPE_BOOL;
+    case VTERM_ATTR_STRIKE:     return VTERM_VALUETYPE_BOOL;
+    case VTERM_ATTR_FONT:       return VTERM_VALUETYPE_INT;
+    case VTERM_ATTR_FOREGROUND: return VTERM_VALUETYPE_COLOR;
+    case VTERM_ATTR_BACKGROUND: return VTERM_VALUETYPE_COLOR;
+    case VTERM_ATTR_SMALL:      return VTERM_VALUETYPE_BOOL;
+    case VTERM_ATTR_BASELINE:   return VTERM_VALUETYPE_INT;
+
+    case VTERM_N_ATTRS: return 0;
+  }
+  return 0; /* UNREACHABLE */
+}
+
+VTermValueType vterm_get_prop_type(VTermProp prop)
+{
+  switch(prop) {
+    case VTERM_PROP_CURSORVISIBLE: return VTERM_VALUETYPE_BOOL;
+    case VTERM_PROP_CURSORBLINK:   return VTERM_VALUETYPE_BOOL;
+    case VTERM_PROP_ALTSCREEN:     return VTERM_VALUETYPE_BOOL;
+    case VTERM_PROP_TITLE:         return VTERM_VALUETYPE_STRING;
+    case VTERM_PROP_ICONNAME:      return VTERM_VALUETYPE_STRING;
+    case VTERM_PROP_REVERSE:       return VTERM_VALUETYPE_BOOL;
+    case VTERM_PROP_CURSORSHAPE:   return VTERM_VALUETYPE_INT;
+    case VTERM_PROP_MOUSE:         return VTERM_VALUETYPE_INT;
+    case VTERM_PROP_CURSORCOLOR:   return VTERM_VALUETYPE_STRING;
+
+    case VTERM_N_PROPS: return 0;
+  }
+  return 0; /* UNREACHABLE */
+}
+
+void vterm_scroll_rect(VTermRect rect,
+    int downward,
+    int rightward,
+    int (*moverect)(VTermRect src, VTermRect dest, void *user),
+    int (*eraserect)(VTermRect rect, int selective, void *user),
+    void *user)
+{
+  VTermRect src;
+  VTermRect dest;
+
+  if(abs(downward)  >= rect.end_row - rect.start_row ||
+     abs(rightward) >= rect.end_col - rect.start_col) {
+    /* Scroll more than area; just erase the lot */
+    (*eraserect)(rect, 0, user);
+    return;
+  }
+
+  if(rightward >= 0) {
+    /* rect: [XXX................]
+     * src:     [----------------]
+     * dest: [----------------]
+     */
+    dest.start_col = rect.start_col;
+    dest.end_col   = rect.end_col   - rightward;
+    src.start_col  = rect.start_col + rightward;
+    src.end_col    = rect.end_col;
+  }
+  else {
+    /* rect: [................XXX]
+     * src:  [----------------]
+     * dest:    [----------------]
+     */
+    int leftward = -rightward;
+    dest.start_col = rect.start_col + leftward;
+    dest.end_col   = rect.end_col;
+    src.start_col  = rect.start_col;
+    src.end_col    = rect.end_col - leftward;
+  }
+
+  if(downward >= 0) {
+    dest.start_row = rect.start_row;
+    dest.end_row   = rect.end_row   - downward;
+    src.start_row  = rect.start_row + downward;
+    src.end_row    = rect.end_row;
+  }
+  else {
+    int upward = -downward;
+    dest.start_row = rect.start_row + upward;
+    dest.end_row   = rect.end_row;
+    src.start_row  = rect.start_row;
+    src.end_row    = rect.end_row - upward;
+  }
+
+  if(moverect)
+    (*moverect)(dest, src, user);
+
+  if(downward > 0)
+    rect.start_row = rect.end_row - downward;
+  else if(downward < 0)
+    rect.end_row = rect.start_row - downward;
+
+  if(rightward > 0)
+    rect.start_col = rect.end_col - rightward;
+  else if(rightward < 0)
+    rect.end_col = rect.start_col - rightward;
+
+  (*eraserect)(rect, 0, user);
+}
+
+void vterm_copy_cells(VTermRect dest,
+    VTermRect src,
+    void (*copycell)(VTermPos dest, VTermPos src, void *user),
+    void *user)
+{
+  int downward  = src.start_row - dest.start_row;
+  int rightward = src.start_col - dest.start_col;
+
+  int init_row, test_row, init_col, test_col;
+  int inc_row, inc_col;
+
+  if(downward < 0) {
+    init_row = dest.end_row - 1;
+    test_row = dest.start_row - 1;
+    inc_row = -1;
+  }
+  else /* downward >= 0 */ {
+    init_row = dest.start_row;
+    test_row = dest.end_row;
+    inc_row = +1;
+  }
+
+  if(rightward < 0) {
+    init_col = dest.end_col - 1;
+    test_col = dest.start_col - 1;
+    inc_col = -1;
+  }
+  else /* rightward >= 0 */ {
+    init_col = dest.start_col;
+    test_col = dest.end_col;
+    inc_col = +1;
+  }
+
+  VTermPos pos;
+  for(pos.row = init_row; pos.row != test_row; pos.row += inc_row)
+    for(pos.col = init_col; pos.col != test_col; pos.col += inc_col) {
+      VTermPos srcpos;
+      srcpos.row = pos.row + downward;
+      srcpos.col = pos.col + rightward;
+      (*copycell)(pos, srcpos, user);
+    }
+}
+
+void vterm_check_version(int major, int minor)
+{
+  if(major != VTERM_VERSION_MAJOR) {
+    fprintf(stderr, "libvterm major version mismatch; %d (wants) != %d (library)\n",
+        major, VTERM_VERSION_MAJOR);
+    exit(1);
+  }
+
+  if(minor > VTERM_VERSION_MINOR) {
+    fprintf(stderr, "libvterm minor version mismatch; %d (wants) > %d (library)\n",
+        minor, VTERM_VERSION_MINOR);
+    exit(1);
+  }
+
+  // Happy
+}
diff --git a/src/libvterm/src/vterm_internal.h b/src/libvterm/src/vterm_internal.h
new file mode 100644
index 0000000..3e95611
--- /dev/null
+++ b/src/libvterm/src/vterm_internal.h
@@ -0,0 +1,329 @@
+#ifndef __VTERM_INTERNAL_H__
+#define __VTERM_INTERNAL_H__
+
+#include "vterm.h"
+
+#include <stdarg.h>
+
+#if defined(__GNUC__) && !defined(__MINGW32__)
+# define INTERNAL __attribute__((visibility("internal")))
+#else
+# define INTERNAL
+#endif
+
+#if defined(__GNUC__) || defined(__MINGW32__)
+# define UNUSED __attribute__((unused))
+#else
+# define UNUSED
+#endif
+
+#ifdef DEBUG
+# define DEBUG_LOG(s) fprintf(stderr, s)
+# define DEBUG_LOG1(s, a) fprintf(stderr, s, a)
+# define DEBUG_LOG2(s, a, b) fprintf(stderr, s, a, b)
+# define DEBUG_LOG3(s, a, b, c) fprintf(stderr, s, a, b, c)
+#else
+# define DEBUG_LOG(s)
+# define DEBUG_LOG1(s, a)
+# define DEBUG_LOG2(s, a, b)
+# define DEBUG_LOG3(s, a, b, c)
+#endif
+
+#define ESC_S "\x1b"
+
+#define INTERMED_MAX 16
+
+#define CSI_ARGS_MAX 16
+#define CSI_LEADER_MAX 16
+
+#define BUFIDX_PRIMARY   0
+#define BUFIDX_ALTSCREEN 1
+
+typedef struct VTermEncoding VTermEncoding;
+
+typedef struct {
+  VTermEncoding *enc;
+
+  // This size should be increased if required by other stateful encodings
+  char           data[4*sizeof(uint32_t)];
+} VTermEncodingInstance;
+
+struct VTermPen
+{
+  VTermColor fg;
+  VTermColor bg;
+  unsigned int bold:1;
+  unsigned int underline:2;
+  unsigned int italic:1;
+  unsigned int blink:1;
+  unsigned int reverse:1;
+  unsigned int conceal:1;
+  unsigned int strike:1;
+  unsigned int font:4; /* To store 0-9 */
+  unsigned int small:1;
+  unsigned int baseline:2;
+};
+
+struct VTermState
+{
+  VTerm *vt;
+
+  const VTermStateCallbacks *callbacks;
+  void *cbdata;
+
+  const VTermStateFallbacks *fallbacks;
+  void *fbdata;
+
+  int rows;
+  int cols;
+
+  /* Current cursor position */
+  VTermPos pos;
+
+  int at_phantom; /* True if we're on the "81st" phantom column to defer a wraparound */
+
+  int scrollregion_top;
+  int scrollregion_bottom; /* -1 means unbounded */
+#define SCROLLREGION_BOTTOM(state) ((state)->scrollregion_bottom > -1 ? (state)->scrollregion_bottom : (state)->rows)
+  int scrollregion_left;
+#define SCROLLREGION_LEFT(state)  ((state)->mode.leftrightmargin ? (state)->scrollregion_left : 0)
+  int scrollregion_right; /* -1 means unbounded */
+#define SCROLLREGION_RIGHT(state) ((state)->mode.leftrightmargin && (state)->scrollregion_right > -1 ? (state)->scrollregion_right : (state)->cols)
+
+  /* Bitvector of tab stops */
+  unsigned char *tabstops;
+
+  /* Primary and Altscreen; lineinfos[1] is lazily allocated as needed */
+  VTermLineInfo *lineinfos[2];
+
+  /* lineinfo will == lineinfos[0] or lineinfos[1], depending on altscreen */
+  VTermLineInfo *lineinfo;
+#define ROWWIDTH(state,row) ((state)->lineinfo[(row)].doublewidth ? ((state)->cols / 2) : (state)->cols)
+#define THISROWWIDTH(state) ROWWIDTH(state, (state)->pos.row)
+
+  /* Mouse state */
+  int mouse_col, mouse_row;
+  int mouse_buttons;
+  int mouse_flags;
+
+  enum { MOUSE_X10, MOUSE_UTF8, MOUSE_SGR, MOUSE_RXVT } mouse_protocol;
+
+  /* Last glyph output, for Unicode recombining purposes */
+  uint32_t *combine_chars;
+  size_t combine_chars_size; // Number of ELEMENTS in the above
+  int combine_width; // The width of the glyph above
+  VTermPos combine_pos;   // Position before movement
+
+  struct {
+    unsigned int keypad:1;
+    unsigned int cursor:1;
+    unsigned int autowrap:1;
+    unsigned int insert:1;
+    unsigned int newline:1;
+    unsigned int cursor_visible:1;
+    unsigned int cursor_blink:1;
+    unsigned int cursor_shape:2;
+    unsigned int alt_screen:1;
+    unsigned int origin:1;
+    unsigned int screen:1;
+    unsigned int leftrightmargin:1;
+    unsigned int bracketpaste:1;
+    unsigned int report_focus:1;
+    unsigned int modify_other_keys:1;
+    unsigned int kitty_keyboard:1;
+  } mode;
+
+  VTermEncodingInstance encoding[4], encoding_utf8;
+  int gl_set, gr_set, gsingle_set;
+
+  struct VTermPen pen;
+
+  VTermColor default_fg;
+  VTermColor default_bg;
+  VTermColor colors[16]; // Store the 8 ANSI and the 8 ANSI high-brights only
+
+  int bold_is_highbright;
+
+  unsigned int protected_cell : 1;
+
+  /* Saved state under DEC mode 1048/1049 */
+  struct {
+    VTermPos pos;
+    struct VTermPen pen;
+
+    struct {
+      unsigned int cursor_visible:1;
+      unsigned int cursor_blink:1;
+      unsigned int cursor_shape:2;
+    } mode;
+  } saved;
+
+  /* Temporary state for DECRQSS parsing */
+  union {
+    char decrqss[4];
+    struct {
+      uint16_t mask;
+      enum {
+        SELECTION_INITIAL,
+        SELECTION_SELECTED,
+        SELECTION_QUERY,
+        SELECTION_SET_INITIAL,
+        SELECTION_SET,
+      } state : 8;
+      uint32_t recvpartial;
+      uint32_t sendpartial;
+    } selection;
+  } tmp;
+
+  struct {
+    const VTermSelectionCallbacks *callbacks;
+    void *user;
+    char *buffer;
+    size_t buflen;
+  } selection;
+};
+
+struct VTerm
+{
+  const VTermAllocatorFunctions *allocator;
+  void *allocdata;
+
+  int rows;
+  int cols;
+
+  struct {
+    unsigned int utf8:1;
+    unsigned int ctrl8bit:1;
+  } mode;
+
+  struct {
+    enum VTermParserState {
+      NORMAL,
+      CSI_LEADER,
+      CSI_ARGS,
+      CSI_INTERMED,
+      DCS_COMMAND,
+      /* below here are the "string states" */
+      OSC_COMMAND,
+      OSC,
+      DCS,
+      APC,
+      PM,
+      SOS,
+    } state;
+
+    unsigned int in_esc : 1;
+
+    int intermedlen;
+    char intermed[INTERMED_MAX];
+
+    union {
+      struct {
+        int leaderlen;
+        char leader[CSI_LEADER_MAX];
+
+        int argi;
+        long args[CSI_ARGS_MAX];
+      } csi;
+      struct {
+        int command;
+      } osc;
+      struct {
+        int commandlen;
+        char command[CSI_LEADER_MAX];
+      } dcs;
+    } v;
+
+    const VTermParserCallbacks *callbacks;
+    void *cbdata;
+
+    int string_initial;
+  } parser;
+
+  /* len == malloc()ed size; cur == number of valid bytes */
+
+  VTermOutputCallback *outfunc;
+  void                *outdata;
+
+  char  *outbuffer;
+  size_t outbuffer_len;
+  size_t outbuffer_cur;
+
+  char  *tmpbuffer;
+  size_t tmpbuffer_len;
+
+  VTermState *state;
+  VTermScreen *screen;
+
+  int in_backspace;
+};
+
+struct VTermEncoding {
+  void (*init) (VTermEncoding *enc, void *data);
+  void (*decode)(VTermEncoding *enc, void *data,
+                 uint32_t cp[], int *cpi, int cplen,
+                 const char bytes[], size_t *pos, size_t len);
+};
+
+typedef enum {
+  ENC_UTF8,
+  ENC_SINGLE_94
+} VTermEncodingType;
+
+void *vterm_allocator_malloc(VTerm *vt, size_t size);
+void  vterm_allocator_free(VTerm *vt, void *ptr);
+
+void vterm_push_output_bytes(VTerm *vt, const char *bytes, size_t len);
+void vterm_push_output_vsprintf(VTerm *vt, const char *format, va_list args);
+void vterm_push_output_sprintf(VTerm *vt, const char *format, ...);
+void vterm_push_output_sprintf_ctrl(VTerm *vt, unsigned char ctrl, const char *fmt, ...);
+void vterm_push_output_sprintf_str(VTerm *vt, unsigned char ctrl, int term, const char *fmt, ...);
+
+void vterm_state_free(VTermState *state);
+
+void vterm_state_newpen(VTermState *state);
+void vterm_state_resetpen(VTermState *state);
+void vterm_state_setpen(VTermState *state, const long args[], int argcount);
+int  vterm_state_getpen(VTermState *state, long args[], int argcount);
+void vterm_state_savepen(VTermState *state, int save);
+
+enum {
+  C1_SS3 = 0x8f,
+  C1_DCS = 0x90,
+  C1_CSI = 0x9b,
+  C1_ST  = 0x9c,
+  C1_OSC = 0x9d,
+};
+
+void vterm_state_push_output_sprintf_CSI(VTermState *vts, const char *format, ...);
+
+void vterm_screen_free(VTermScreen *screen);
+
+VTermEncoding *vterm_lookup_encoding(VTermEncodingType type, char designation);
+
+int vterm_unicode_width(uint32_t codepoint);
+int vterm_unicode_is_combining(uint32_t codepoint);
+int vterm_unicode_is_ambiguous(uint32_t codepoint);
+int vterm_get_special_pty_type(void);
+
+#if (defined(_XOPEN_SOURCE) && _XOPEN_SOURCE >= 500) \
+	|| defined(_ISOC99_SOURCE) || defined(_BSD_SOURCE)
+# undef VSNPRINTF
+# define VSNPRINTF vsnprintf
+# undef SNPRINTF
+#else
+# ifdef VSNPRINTF
+// Use a provided vsnprintf() function.
+int VSNPRINTF(char *str, size_t str_m, const char *fmt, va_list ap);
+# endif
+# ifdef SNPRINTF
+// Use a provided snprintf() function.
+int SNPRINTF(char *str, size_t str_m, const char *fmt, ...);
+# endif
+#endif
+#ifndef SNPRINTF
+# define SNPRINTF snprintf
+#endif
+
+
+#endif
diff --git a/src/libvterm/t/02parser.test b/src/libvterm/t/02parser.test
new file mode 100644
index 0000000..2cc51dc
--- /dev/null
+++ b/src/libvterm/t/02parser.test
@@ -0,0 +1,266 @@
+INIT
+UTF8 0
+WANTPARSER
+
+!Basic text
+PUSH "hello"
+  text 0x68, 0x65, 0x6c, 0x6c, 0x6f
+
+!C0
+PUSH "\x03"
+  control 3
+
+PUSH "\x1f"
+  control 0x1f
+
+!C1 8bit
+PUSH "\x83"
+  control 0x83
+
+PUSH "\x99"
+  control 0x99
+
+!C1 7bit
+PUSH "\e\x43"
+  control 0x83
+
+PUSH "\e\x59"
+  control 0x99
+
+!High bytes
+PUSH "\xa0\xcc\xfe"
+  text 0xa0, 0xcc, 0xfe
+
+!Mixed
+PUSH "1\n2"
+  text 0x31
+  control 10
+  text 0x32
+
+!Escape
+PUSH "\e="
+  escape "="
+
+!Escape 2-byte
+PUSH "\e(X"
+  escape "(X"
+
+!Split write Escape
+PUSH "\e("
+PUSH "Y"
+  escape "(Y"
+
+!Escape cancels Escape, starts another
+PUSH "\e(\e)Z"
+  escape ")Z"
+
+!CAN cancels Escape, returns to normal mode
+PUSH "\e(\x{18}AB"
+  text 0x41, 0x42
+
+!C0 in Escape interrupts and continues
+PUSH "\e(\nX"
+  control 10
+  escape "(X"
+
+!CSI 0 args
+PUSH "\e[a"
+  csi 0x61 *
+
+!CSI 1 arg
+PUSH "\e[9b"
+  csi 0x62 9
+
+!CSI 2 args
+PUSH "\e[3;4c"
+  csi 0x63 3,4
+
+!CSI 1 arg 1 sub
+PUSH "\e[1:2c"
+  csi 0x63 1+,2
+
+!CSI many digits
+PUSH "\e[678d"
+  csi 0x64 678
+
+!CSI leading zero
+PUSH "\e[007e"
+  csi 0x65 7
+
+!CSI qmark
+PUSH "\e[?2;7f"
+  csi 0x66 L=3f 2,7
+
+!CSI greater
+PUSH "\e[>c"
+  csi 0x63 L=3e *
+
+!CSI SP
+PUSH "\e[12 q"
+  csi 0x71 12 I=20
+
+!Mixed CSI
+PUSH "A\e[8mB"
+  text 0x41
+  csi 0x6d 8
+  text 0x42
+
+!Split write
+PUSH "\e"
+PUSH "[a"
+  csi 0x61 *
+PUSH "foo\e["
+  text 0x66, 0x6f, 0x6f
+PUSH "4b"
+  csi 0x62 4
+PUSH "\e[12;"
+PUSH "3c"
+  csi 0x63 12,3
+
+!Escape cancels CSI, starts Escape
+PUSH "\e[123\e9"
+  escape "9"
+
+!CAN cancels CSI, returns to normal mode
+PUSH "\e[12\x{18}AB"
+  text 0x41, 0x42
+
+!C0 in Escape interrupts and continues
+PUSH "\e[12\n;3X"
+  control 10
+  csi 0x58 12,3
+
+!OSC BEL
+PUSH "\e]1;Hello\x07"
+  osc [1 "Hello"]
+
+!OSC ST (7bit)
+PUSH "\e]1;Hello\e\\"
+  osc [1 "Hello"]
+
+!OSC ST (8bit)
+PUSH "\x{9d}1;Hello\x9c"
+  osc [1 "Hello"]
+
+!OSC in parts
+PUSH "\e]52;abc"
+  osc [52 "abc"
+PUSH "def"
+  osc "def"
+PUSH "ghi\e\\"
+  osc "ghi"]
+
+!OSC BEL without semicolon 
+PUSH "\e]1234\x07"
+  osc [1234 ]
+
+!OSC ST without semicolon 
+PUSH "\e]1234\e\\"
+  osc [1234 ]
+
+!Escape cancels OSC, starts Escape
+PUSH "\e]Something\e9"
+  escape "9"
+
+!CAN cancels OSC, returns to normal mode
+PUSH "\e]12\x{18}AB"
+  text 0x41, 0x42
+
+!C0 in OSC interrupts and continues
+PUSH "\e]2;\nBye\x07"
+  osc [2 ""
+  control 10
+  osc "Bye"]
+
+!DCS BEL
+PUSH "\ePHello\x07"
+  dcs ["Hello"]
+
+!DCS ST (7bit)
+PUSH "\ePHello\e\\"
+  dcs ["Hello"]
+
+!DCS ST (8bit)
+PUSH "\x{90}Hello\x9c"
+  dcs ["Hello"]
+
+!Split write of 7bit ST
+PUSH "\ePABC\e"
+  dcs ["ABC"
+PUSH "\\"
+  dcs ]
+
+!Escape cancels DCS, starts Escape
+PUSH "\ePSomething\e9"
+  escape "9"
+
+!CAN cancels DCS, returns to normal mode
+PUSH "\eP12\x{18}AB"
+  text 0x41, 0x42
+
+!C0 in OSC interrupts and continues
+PUSH "\ePBy\ne\x07"
+  dcs ["By"
+  control 10
+  dcs "e"]
+
+!APC BEL
+PUSH "\e_Hello\x07"
+  apc ["Hello"]
+
+!APC ST (7bit)
+PUSH "\e_Hello\e\\"
+  apc ["Hello"]
+
+!APC ST (8bit)
+PUSH "\x{9f}Hello\x9c"
+  apc ["Hello"]
+
+!PM BEL
+PUSH "\e^Hello\x07"
+  pm ["Hello"]
+
+!PM ST (7bit)
+PUSH "\e^Hello\e\\"
+  pm ["Hello"]
+
+!PM ST (8bit)
+PUSH "\x{9e}Hello\x9c"
+  pm ["Hello"]
+
+!SOS BEL
+PUSH "\eXHello\x07"
+  sos ["Hello"]
+
+!SOS ST (7bit)
+PUSH "\eXHello\e\\"
+  sos ["Hello"]
+
+!SOS ST (8bit)
+PUSH "\x{98}Hello\x9c"
+  sos ["Hello"]
+
+!SOS can contain any C0 or C1 code
+PUSH "\eXABC\x01DEF\e\\"
+  sos ["ABC\x01DEF"]
+PUSH "\eXABC\x99DEF\e\\"
+  sos ["ABC\x{99}DEF"]
+
+!NUL ignored
+PUSH "\x{00}"
+
+!NUL ignored within CSI
+PUSH "\e[12\x{00}3m"
+  csi 0x6d 123
+
+!DEL ignored
+PUSH "\x{7f}"
+
+!DEL ignored within CSI
+PUSH "\e[12\x{7f}3m"
+  csi 0x6d 123
+
+!DEL inside text"
+PUSH "AB\x{7f}C"
+  text 0x41,0x42
+  text 0x43
diff --git a/src/libvterm/t/03encoding_utf8.test b/src/libvterm/t/03encoding_utf8.test
new file mode 100644
index 0000000..7ee16ac
--- /dev/null
+++ b/src/libvterm/t/03encoding_utf8.test
@@ -0,0 +1,122 @@
+INIT
+WANTENCODING
+
+!Low
+ENCIN "123"
+  encout 0x31,0x32,0x33
+
+# We want to prove the UTF-8 parser correctly handles all the sequences.
+# Easy way to do this is to check it does low/high boundary cases, as that
+# leaves only two for each sequence length
+#
+# These ranges are therefore:
+#
+# Two bytes:
+# U+0080 = 000 10000000 =>    00010   000000
+#                       => 11000010 10000000 = C2 80
+# U+07FF = 111 11111111 =>    11111   111111
+#                       => 11011111 10111111 = DF BF
+#
+# Three bytes:
+# U+0800 = 00001000 00000000 =>     0000   100000   000000
+#                            => 11100000 10100000 10000000 = E0 A0 80
+# U+FFFD = 11111111 11111101 =>     1111   111111   111101
+#                            => 11101111 10111111 10111101 = EF BF BD
+# (We avoid U+FFFE and U+FFFF as they're invalid codepoints)
+#
+# Four bytes:
+# U+10000  = 00001 00000000 00000000 =>      000   010000   000000   000000
+#                                    => 11110000 10010000 10000000 10000000 = F0 90 80 80
+# U+1FFFFF = 11111 11111111 11111111 =>      111   111111   111111   111111
+#                                    => 11110111 10111111 10111111 10111111 = F7 BF BF BF
+
+!2 byte
+ENCIN "\xC2\x80\xDF\xBF"
+  encout 0x0080, 0x07FF
+
+!3 byte
+ENCIN "\xE0\xA0\x80\xEF\xBF\xBD"
+  encout 0x0800,0xFFFD
+
+!4 byte
+ENCIN "\xF0\x90\x80\x80\xF7\xBF\xBF\xBF"
+  encout 0x10000,0x1fffff
+
+# Next up, we check some invalid sequences
+#  + Early termination (back to low bytes too soon)
+#  + Early restart (another sequence introduction before the previous one was finished)
+
+!Early termination
+ENCIN "\xC2!"
+  encout 0xfffd,0x21
+
+ENCIN "\xE0!\xE0\xA0!"
+  encout 0xfffd,0x21,0xfffd,0x21
+
+ENCIN "\xF0!\xF0\x90!\xF0\x90\x80!"
+  encout 0xfffd,0x21,0xfffd,0x21,0xfffd,0x21
+
+!Early restart
+ENCIN "\xC2\xC2\x90"
+  encout 0xfffd,0x0090
+
+ENCIN "\xE0\xC2\x90\xE0\xA0\xC2\x90"
+  encout 0xfffd,0x0090,0xfffd,0x0090
+
+ENCIN "\xF0\xC2\x90\xF0\x90\xC2\x90\xF0\x90\x80\xC2\x90"
+  encout 0xfffd,0x0090,0xfffd,0x0090,0xfffd,0x0090
+
+# Test the overlong sequences by giving an overlong encoding of U+0000 and
+# an encoding of the highest codepoint still too short
+#
+# Two bytes:
+# U+0000 = C0 80
+# U+007F = 000 01111111 =>    00001   111111 =>
+#                       => 11000001 10111111 => C1 BF
+#
+# Three bytes:
+# U+0000 = E0 80 80
+# U+07FF = 00000111 11111111 =>     0000   011111   111111
+#                            => 11100000 10011111 10111111 = E0 9F BF
+#
+# Four bytes:
+# U+0000 = F0 80 80 80
+# U+FFFF = 11111111 11111111 =>      000   001111   111111   111111
+#                            => 11110000 10001111 10111111 10111111 = F0 8F BF BF
+
+!Overlong
+ENCIN "\xC0\x80\xC1\xBF"
+  encout 0xfffd,0xfffd
+
+ENCIN "\xE0\x80\x80\xE0\x9F\xBF"
+  encout 0xfffd,0xfffd
+
+ENCIN "\xF0\x80\x80\x80\xF0\x8F\xBF\xBF"
+  encout 0xfffd,0xfffd
+
+# UTF-16 surrogates U+D800 and U+DFFF
+!UTF-16 Surrogates
+ENCIN "\xED\xA0\x80\xED\xBF\xBF"
+  encout 0xfffd,0xfffd
+
+!Split write
+ENCIN "\xC2"
+ENCIN "\xA0"
+  encout 0x000A0
+
+ENCIN "\xE0"
+ENCIN "\xA0\x80"
+  encout 0x00800
+ENCIN "\xE0\xA0"
+ENCIN "\x80"
+  encout 0x00800
+
+ENCIN "\xF0"
+ENCIN "\x90\x80\x80"
+  encout 0x10000
+ENCIN "\xF0\x90"
+ENCIN "\x80\x80"
+  encout 0x10000
+ENCIN "\xF0\x90\x80"
+ENCIN "\x80"
+  encout 0x10000
diff --git a/src/libvterm/t/10state_putglyph.test b/src/libvterm/t/10state_putglyph.test
new file mode 100644
index 0000000..c82c525
--- /dev/null
+++ b/src/libvterm/t/10state_putglyph.test
@@ -0,0 +1,74 @@
+INIT
+UTF8 1
+WANTSTATE g
+
+!Low
+RESET
+PUSH "ABC"
+  putglyph 0x41 1 0,0
+  putglyph 0x42 1 0,1
+  putglyph 0x43 1 0,2
+
+!UTF-8 1 char
+# U+00C1 = 0xC3 0x81  name: LATIN CAPITAL LETTER A WITH ACUTE
+# U+00E9 = 0xC3 0xA9  name: LATIN SMALL LETTER E WITH ACUTE
+RESET
+PUSH "\xC3\x81\xC3\xA9"
+  putglyph 0xc1 1 0,0
+  putglyph 0xe9 1 0,1
+
+!UTF-8 split writes
+RESET
+PUSH "\xC3"
+PUSH "\x81"
+  putglyph 0xc1 1 0,0
+
+!UTF-8 wide char
+# U+FF10 = 0xEF 0xBC 0x90  name: FULLWIDTH DIGIT ZERO
+RESET
+PUSH "\xEF\xBC\x90 "
+  putglyph 0xff10 2 0,0
+  putglyph 0x20 1 0,2
+
+!UTF-8 emoji wide char
+# U+1F600 = 0xF0 0x9F 0x98 0x80  name: GRINNING FACE
+RESET
+PUSH "\xF0\x9F\x98\x80 "
+  putglyph 0x1f600 2 0,0
+  putglyph 0x20 1 0,2
+
+!UTF-8 combining chars
+# U+0301 = 0xCC 0x81  name: COMBINING ACUTE
+RESET
+PUSH "e\xCC\x81Z"
+  putglyph 0x65,0x301 1 0,0
+  putglyph 0x5a 1 0,1
+
+!Combining across buffers
+RESET
+PUSH "e"
+  putglyph 0x65 1 0,0
+PUSH "\xCC\x81Z"
+  putglyph 0x65,0x301 1 0,0
+  putglyph 0x5a 1 0,1
+
+!Spare combining chars get truncated
+RESET
+PUSH "e" . "\xCC\x81" x 10
+  putglyph 0x65,0x301,0x301,0x301,0x301,0x301 1 0,0
+  # and nothing more
+
+RESET
+PUSH "e"
+  putglyph 0x65 1 0,0
+PUSH "\xCC\x81"
+  putglyph 0x65,0x301 1 0,0
+PUSH "\xCC\x82"
+  putglyph 0x65,0x301,0x302 1 0,0
+
+!DECSCA protected
+RESET
+PUSH "A\e[1\"qB\e[2\"qC"
+  putglyph 0x41 1 0,0
+  putglyph 0x42 1 0,1 prot
+  putglyph 0x43 1 0,2
diff --git a/src/libvterm/t/11state_movecursor.test b/src/libvterm/t/11state_movecursor.test
new file mode 100644
index 0000000..26e447e
--- /dev/null
+++ b/src/libvterm/t/11state_movecursor.test
@@ -0,0 +1,224 @@
+INIT
+UTF8 1
+WANTSTATE
+
+!Implicit
+PUSH "ABC"
+  ?cursor = 0,3
+!Backspace
+PUSH "\b"
+  ?cursor = 0,2
+!Horizontal Tab
+PUSH "\t"
+  ?cursor = 0,8
+!Carriage Return
+PUSH "\r"
+  ?cursor = 0,0
+!Linefeed
+PUSH "\n"
+  ?cursor = 1,0
+
+!Backspace bounded by lefthand edge
+PUSH "\e[4;2H"
+  ?cursor = 3,1
+PUSH "\b"
+  ?cursor = 3,0
+PUSH "\b"
+  ?cursor = 3,0
+
+!Backspace cancels phantom
+PUSH "\e[4;80H"
+  ?cursor = 3,79
+PUSH "X"
+  ?cursor = 3,79
+PUSH "\b"
+  ?cursor = 3,78
+
+!HT bounded by righthand edge
+PUSH "\e[1;78H"
+  ?cursor = 0,77
+PUSH "\t"
+  ?cursor = 0,79
+PUSH "\t"
+  ?cursor = 0,79
+
+RESET
+
+!Index
+PUSH "ABC\eD"
+  ?cursor = 1,3
+!Reverse Index
+PUSH "\eM"
+  ?cursor = 0,3
+!Newline
+PUSH "\eE"
+  ?cursor = 1,0
+
+RESET
+
+!Cursor Forward
+PUSH "\e[B"
+  ?cursor = 1,0
+PUSH "\e[3B"
+  ?cursor = 4,0
+PUSH "\e[0B"
+  ?cursor = 5,0
+
+!Cursor Down
+PUSH "\e[C"
+  ?cursor = 5,1
+PUSH "\e[3C"
+  ?cursor = 5,4
+PUSH "\e[0C"
+  ?cursor = 5,5
+
+!Cursor Up
+PUSH "\e[A"
+  ?cursor = 4,5
+PUSH "\e[3A"
+  ?cursor = 1,5
+PUSH "\e[0A"
+  ?cursor = 0,5
+
+!Cursor Backward
+PUSH "\e[D"
+  ?cursor = 0,4
+PUSH "\e[3D"
+  ?cursor = 0,1
+PUSH "\e[0D"
+  ?cursor = 0,0
+
+!Cursor Next Line
+PUSH "   "
+  ?cursor = 0,3
+PUSH "\e[E"
+  ?cursor = 1,0
+PUSH "   "
+  ?cursor = 1,3
+PUSH "\e[2E"
+  ?cursor = 3,0
+PUSH "\e[0E"
+  ?cursor = 4,0
+
+!Cursor Previous Line
+PUSH "   "
+  ?cursor = 4,3
+PUSH "\e[F"
+  ?cursor = 3,0
+PUSH "   "
+  ?cursor = 3,3
+PUSH "\e[2F"
+  ?cursor = 1,0
+PUSH "\e[0F"
+  ?cursor = 0,0
+
+!Cursor Horizontal Absolute
+PUSH "\n"
+  ?cursor = 1,0
+PUSH "\e[20G"
+  ?cursor = 1,19
+PUSH "\e[G"
+  ?cursor = 1,0
+
+!Cursor Position
+PUSH "\e[10;5H"
+  ?cursor = 9,4
+PUSH "\e[8H"
+  ?cursor = 7,0
+PUSH "\e[H"
+  ?cursor = 0,0
+
+!Cursor Position cancels phantom
+PUSH "\e[10;78H"
+  ?cursor = 9,77
+PUSH "ABC"
+  ?cursor = 9,79
+PUSH "\e[10;80H"
+PUSH "C"
+  ?cursor = 9,79
+PUSH "X"
+  ?cursor = 10,1
+
+RESET
+
+!Bounds Checking
+PUSH "\e[A"
+  ?cursor = 0,0
+PUSH "\e[D"
+  ?cursor = 0,0
+PUSH "\e[25;80H"
+  ?cursor = 24,79
+PUSH "\e[B"
+  ?cursor = 24,79
+PUSH "\e[C"
+  ?cursor = 24,79
+PUSH "\e[E"
+  ?cursor = 24,0
+PUSH "\e[H"
+  ?cursor = 0,0
+PUSH "\e[F"
+  ?cursor = 0,0
+PUSH "\e[999G"
+  ?cursor = 0,79
+PUSH "\e[99;99H"
+  ?cursor = 24,79
+
+RESET
+
+!Horizontal Position Absolute
+PUSH "\e[5`"
+  ?cursor = 0,4
+
+!Horizontal Position Relative
+PUSH "\e[3a"
+  ?cursor = 0,7
+
+!Horizontal Position Backward
+PUSH "\e[3j"
+  ?cursor = 0,4
+
+!Horizontal and Vertical Position
+PUSH "\e[3;3f"
+  ?cursor = 2,2
+
+!Vertical Position Absolute
+PUSH "\e[5d"
+  ?cursor = 4,2
+
+!Vertical Position Relative
+PUSH "\e[2e"
+  ?cursor = 6,2
+
+!Vertical Position Backward
+PUSH "\e[2k"
+  ?cursor = 4,2
+
+RESET
+
+!Horizontal Tab
+PUSH "\t"
+  ?cursor = 0,8
+PUSH "   "
+  ?cursor = 0,11
+PUSH "\t"
+  ?cursor = 0,16
+PUSH "       "
+  ?cursor = 0,23
+PUSH "\t"
+  ?cursor = 0,24
+PUSH "        "
+  ?cursor = 0,32
+PUSH "\t"
+  ?cursor = 0,40
+
+!Cursor Horizontal Tab
+PUSH "\e[I"
+  ?cursor = 0,48
+PUSH "\e[2I"
+  ?cursor = 0,64
+
+!Cursor Backward Tab
+PUSH "\e[Z"
+  ?cursor = 0,56
+PUSH "\e[2Z"
+  ?cursor = 0,40
diff --git a/src/libvterm/t/12state_scroll.test b/src/libvterm/t/12state_scroll.test
new file mode 100644
index 0000000..c1f2791
--- /dev/null
+++ b/src/libvterm/t/12state_scroll.test
@@ -0,0 +1,156 @@
+INIT
+UTF8 1
+WANTSTATE s
+
+!Linefeed
+PUSH "\n"x24
+  ?cursor = 24,0
+PUSH "\n"
+  scrollrect 0..25,0..80 => +1,+0
+  ?cursor = 24,0
+
+RESET
+
+!Index
+PUSH "\e[25H"
+PUSH "\eD"
+  scrollrect 0..25,0..80 => +1,+0
+
+RESET
+
+!Reverse Index
+PUSH "\eM"
+  scrollrect 0..25,0..80 => -1,+0
+
+RESET
+
+!Linefeed in DECSTBM
+PUSH "\e[1;10r"
+  ?cursor = 0,0
+PUSH "\n"x9
+  ?cursor = 9,0
+PUSH "\n"
+  scrollrect 0..10,0..80 => +1,+0
+  ?cursor = 9,0
+
+!Linefeed outside DECSTBM
+PUSH "\e[20H"
+  ?cursor = 19,0
+PUSH "\n"
+  ?cursor = 20,0
+
+!Index in DECSTBM
+PUSH "\e[9;10r"
+PUSH "\e[10H"
+PUSH "\eM"
+  ?cursor = 8,0
+PUSH "\eM"
+  scrollrect 8..10,0..80 => -1,+0
+
+!Reverse Index in DECSTBM
+PUSH "\e[25H"
+  ?cursor = 24,0
+PUSH "\n"
+  # no scrollrect
+  ?cursor = 24,0
+
+!Linefeed in DECSTBM+DECSLRM
+PUSH "\e[?69h"
+PUSH "\e[3;10r\e[10;40s"
+PUSH "\e[10;10H\n"
+  scrollrect 2..10,9..40 => +1,+0
+
+!IND/RI in DECSTBM+DECSLRM
+PUSH "\eD"
+  scrollrect 2..10,9..40 => +1,+0
+PUSH "\e[3;10H\eM"
+  scrollrect 2..10,9..40 => -1,+0
+
+!DECRQSS on DECSTBM
+PUSH "\eP\$qr\e\\"
+  output "\eP1\$r3;10r\e\\"
+
+!DECRQSS on DECSLRM
+PUSH "\eP\$qs\e\\"
+  output "\eP1\$r10;40s\e\\"
+
+!Setting invalid DECSLRM with !DECVSSM is still rejected
+PUSH "\e[?69l\e[;0s\e[?69h"
+
+RESET
+
+!Scroll Down
+PUSH "\e[S"
+  scrollrect 0..25,0..80 => +1,+0
+  ?cursor = 0,0
+PUSH "\e[2S"
+  scrollrect 0..25,0..80 => +2,+0
+  ?cursor = 0,0
+PUSH "\e[100S"
+  scrollrect 0..25,0..80 => +25,+0
+
+!Scroll Up
+PUSH "\e[T"
+  scrollrect 0..25,0..80 => -1,+0
+  ?cursor = 0,0
+PUSH "\e[2T"
+  scrollrect 0..25,0..80 => -2,+0
+  ?cursor = 0,0
+PUSH "\e[100T"
+  scrollrect 0..25,0..80 => -25,+0
+
+!SD/SU in DECSTBM
+PUSH "\e[5;20r"
+PUSH "\e[S"
+  scrollrect 4..20,0..80 => +1,+0
+PUSH "\e[T"
+  scrollrect 4..20,0..80 => -1,+0
+
+RESET
+
+!SD/SU in DECSTBM+DECSLRM
+PUSH "\e[?69h"
+PUSH "\e[3;10r\e[10;40s"
+  ?cursor = 0,0
+PUSH "\e[3;10H"
+  ?cursor = 2,9
+PUSH "\e[S"
+  scrollrect 2..10,9..40 => +1,+0
+PUSH "\e[?69l"
+PUSH "\e[S"
+  scrollrect 2..10,0..80 => +1,+0
+
+!Invalid boundaries
+RESET
+
+PUSH "\e[100;105r\eD"
+PUSH "\e[5;2r\eD"
+
+RESET
+WANTSTATE -s+me
+
+!Scroll Down move+erase emulation
+PUSH "\e[S"
+  moverect 1..25,0..80 -> 0..24,0..80
+  erase 24..25,0..80
+  ?cursor = 0,0
+PUSH "\e[2S"
+  moverect 2..25,0..80 -> 0..23,0..80
+  erase 23..25,0..80
+  ?cursor = 0,0
+
+!Scroll Up move+erase emulation
+PUSH "\e[T"
+  moverect 0..24,0..80 -> 1..25,0..80
+  erase 0..1,0..80
+  ?cursor = 0,0
+PUSH "\e[2T"
+  moverect 0..23,0..80 -> 2..25,0..80
+  erase 0..2,0..80
+  ?cursor = 0,0
+
+!DECSTBM resets cursor position
+PUSH "\e[5;5H"
+  ?cursor = 4,4
+PUSH "\e[r"
+  ?cursor = 0,0
diff --git a/src/libvterm/t/13state_edit.test b/src/libvterm/t/13state_edit.test
new file mode 100644
index 0000000..d3f3e9e
--- /dev/null
+++ b/src/libvterm/t/13state_edit.test
@@ -0,0 +1,304 @@
+INIT
+UTF8 1
+WANTSTATE seb
+
+!ICH
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "ACD"
+PUSH "\e[2D"
+  ?cursor = 0,1
+PUSH "\e[@"
+  scrollrect 0..1,1..80 => +0,-1
+  ?cursor = 0,1
+PUSH "B"
+  ?cursor = 0,2
+PUSH "\e[3@"
+  scrollrect 0..1,2..80 => +0,-3
+
+!ICH with DECSLRM
+PUSH "\e[?69h"
+PUSH "\e[;50s"
+PUSH "\e[20G\e[@"
+  scrollrect 0..1,19..50 => +0,-1
+
+!ICH outside DECSLRM
+PUSH "\e[70G\e[@"
+  # nothing happens
+
+!DCH
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "ABBC"
+PUSH "\e[3D"
+  ?cursor = 0,1
+PUSH "\e[P"
+  scrollrect 0..1,1..80 => +0,+1
+  ?cursor = 0,1
+PUSH "\e[3P"
+  scrollrect 0..1,1..80 => +0,+3
+  ?cursor = 0,1
+
+!DCH with DECSLRM
+PUSH "\e[?69h"
+PUSH "\e[;50s"
+PUSH "\e[20G\e[P"
+  scrollrect 0..1,19..50 => +0,+1
+
+!DCH outside DECSLRM
+PUSH "\e[70G\e[P"
+  # nothing happens
+
+!ECH
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "ABC"
+PUSH "\e[2D"
+  ?cursor = 0,1
+PUSH "\e[X"
+  erase 0..1,1..2
+  ?cursor = 0,1
+PUSH "\e[3X"
+  erase 0..1,1..4
+  ?cursor = 0,1
+# ECH more columns than there are should be bounded
+PUSH "\e[100X"
+  erase 0..1,1..80
+
+!IL
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "A\r\nC"
+  ?cursor = 1,1
+PUSH "\e[L"
+  scrollrect 1..25,0..80 => -1,+0
+  # TODO: ECMA-48 says we should move to line home, but neither xterm nor
+  # xfce4-terminal do this
+  ?cursor = 1,1
+PUSH "\rB"
+  ?cursor = 1,1
+PUSH "\e[3L"
+  scrollrect 1..25,0..80 => -3,+0
+
+!IL with DECSTBM
+PUSH "\e[5;15r"
+PUSH "\e[5H\e[L"
+  scrollrect 4..15,0..80 => -1,+0
+
+!IL outside DECSTBM
+PUSH "\e[20H\e[L"
+  # nothing happens
+
+!IL with DECSTBM+DECSLRM
+PUSH "\e[?69h"
+PUSH "\e[10;50s"
+PUSH "\e[5;10H\e[L"
+  scrollrect 4..15,9..50 => -1,+0
+
+!DL
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "A\r\nB\r\nB\r\nC"
+  ?cursor = 3,1
+PUSH "\e[2H"
+  ?cursor = 1,0
+PUSH "\e[M"
+  scrollrect 1..25,0..80 => +1,+0
+  ?cursor = 1,0
+PUSH "\e[3M"
+  scrollrect 1..25,0..80 => +3,+0
+  ?cursor = 1,0
+
+!DL with DECSTBM
+PUSH "\e[5;15r"
+PUSH "\e[5H\e[M"
+  scrollrect 4..15,0..80 => +1,+0
+
+!DL outside DECSTBM
+PUSH "\e[20H\e[M"
+  # nothing happens
+
+!DL with DECSTBM+DECSLRM
+PUSH "\e[?69h"
+PUSH "\e[10;50s"
+PUSH "\e[5;10H\e[M"
+  scrollrect 4..15,9..50 => +1,+0
+
+!DECIC
+RESET
+  erase 0..25,0..80
+PUSH "\e[20G\e[5'}"
+  scrollrect 0..25,19..80 => +0,-5
+
+!DECIC with DECSTBM+DECSLRM
+PUSH "\e[?69h"
+PUSH "\e[4;20r\e[20;60s"
+PUSH "\e[4;20H\e[3'}"
+  scrollrect 3..20,19..60 => +0,-3
+
+!DECIC outside DECSLRM
+PUSH "\e[70G\e['}"
+  # nothing happens
+
+!DECDC
+RESET
+  erase 0..25,0..80
+PUSH "\e[20G\e[5'~"
+  scrollrect 0..25,19..80 => +0,+5
+
+!DECDC with DECSTBM+DECSLRM
+PUSH "\e[?69h"
+PUSH "\e[4;20r\e[20;60s"
+PUSH "\e[4;20H\e[3'~"
+  scrollrect 3..20,19..60 => +0,+3
+
+!DECDC outside DECSLRM
+PUSH "\e[70G\e['~"
+  # nothing happens
+
+!EL 0
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "ABCDE"
+PUSH "\e[3D"
+  ?cursor = 0,2
+PUSH "\e[0K"
+  erase 0..1,2..80
+  ?cursor = 0,2
+
+!EL 1
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "ABCDE"
+PUSH "\e[3D"
+  ?cursor = 0,2
+PUSH "\e[1K"
+  erase 0..1,0..3
+  ?cursor = 0,2
+
+!EL 2
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "ABCDE"
+PUSH "\e[3D"
+  ?cursor = 0,2
+PUSH "\e[2K"
+  erase 0..1,0..80
+  ?cursor = 0,2
+
+!SEL
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "\e[11G"
+  ?cursor = 0,10
+PUSH "\e[?0K"
+  erase 0..1,10..80 selective
+  ?cursor = 0,10
+PUSH "\e[?1K"
+  erase 0..1,0..11 selective
+  ?cursor = 0,10
+PUSH "\e[?2K"
+  erase 0..1,0..80 selective
+  ?cursor = 0,10
+
+!ED 0
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "\e[2;2H"
+  ?cursor = 1,1
+PUSH "\e[0J"
+  erase 1..2,1..80
+  erase 2..25,0..80
+  ?cursor = 1,1
+
+!ED 1
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "\e[2;2H"
+  ?cursor = 1,1
+PUSH "\e[1J"
+  erase 0..1,0..80
+  erase 1..2,0..2
+  ?cursor = 1,1
+
+!ED 2
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "\e[2;2H"
+  ?cursor = 1,1
+PUSH "\e[2J"
+  erase 0..25,0..80
+  ?cursor = 1,1
+
+!ED 3
+PUSH "\e[3J"
+  sb_clear
+
+!SED
+RESET
+  erase 0..25,0..80
+PUSH "\e[5;5H"
+  ?cursor = 4,4
+PUSH "\e[?0J"
+  erase 4..5,4..80 selective
+  erase 5..25,0..80 selective
+  ?cursor = 4,4
+PUSH "\e[?1J"
+  erase 0..4,0..80 selective
+  erase 4..5,0..5 selective
+  ?cursor = 4,4
+PUSH "\e[?2J"
+  erase 0..25,0..80 selective
+  ?cursor = 4,4
+
+!DECRQSS on DECSCA
+PUSH "\e[2\"q"
+PUSH "\eP\$q\"q\e\\"
+  output "\eP1\$r2\"q\e\\"
+
+WANTSTATE -s+m
+
+!ICH move+erase emuation
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "ACD"
+PUSH "\e[2D"
+  ?cursor = 0,1
+PUSH "\e[@"
+  moverect 0..1,1..79 -> 0..1,2..80
+  erase 0..1,1..2
+  ?cursor = 0,1
+PUSH "B"
+  ?cursor = 0,2
+PUSH "\e[3@"
+  moverect 0..1,2..77 -> 0..1,5..80
+  erase 0..1,2..5
+
+!DCH move+erase emulation
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "ABBC"
+PUSH "\e[3D"
+  ?cursor = 0,1
+PUSH "\e[P"
+  moverect 0..1,2..80 -> 0..1,1..79
+  erase 0..1,79..80
+  ?cursor = 0,1
+PUSH "\e[3P"
+  moverect 0..1,4..80 -> 0..1,1..77
+  erase 0..1,77..80
+  ?cursor = 0,1
diff --git a/src/libvterm/t/14state_encoding.test b/src/libvterm/t/14state_encoding.test
new file mode 100644
index 0000000..b1f5d69
--- /dev/null
+++ b/src/libvterm/t/14state_encoding.test
@@ -0,0 +1,105 @@
+INIT
+WANTSTATE g
+
+!Default
+RESET
+PUSH "#"
+  putglyph 0x23 1 0,0
+
+!Designate G0=UK
+RESET
+PUSH "\e(A"
+PUSH "#"
+  putglyph 0x00a3 1 0,0
+
+!Designate G0=DEC drawing
+RESET
+PUSH "\e(0"
+PUSH "a"
+  putglyph 0x2592 1 0,0
+
+!Designate G1 + LS1
+RESET
+PUSH "\e)0"
+PUSH "a"
+  putglyph 0x61 1 0,0
+PUSH "\x0e"
+PUSH "a"
+  putglyph 0x2592 1 0,1
+!LS0
+PUSH "\x0f"
+PUSH "a"
+  putglyph 0x61 1 0,2
+
+!Designate G2 + LS2
+PUSH "\e*0"
+PUSH "a"
+  putglyph 0x61 1 0,3
+PUSH "\en"
+PUSH "a"
+  putglyph 0x2592 1 0,4
+PUSH "\x0f"
+PUSH "a"
+  putglyph 0x61 1 0,5
+
+!Designate G3 + LS3
+PUSH "\e+0"
+PUSH "a"
+  putglyph 0x61 1 0,6
+PUSH "\eo"
+PUSH "a"
+  putglyph 0x2592 1 0,7
+PUSH "\x0f"
+PUSH "a"
+  putglyph 0x61 1 0,8
+
+!SS2
+PUSH "a\x{8e}aa"
+  putglyph 0x61 1 0,9
+  putglyph 0x2592 1 0,10
+  putglyph 0x61 1 0,11
+
+!SS3
+PUSH "a\x{8f}aa"
+  putglyph 0x61 1 0,12
+  putglyph 0x2592 1 0,13
+  putglyph 0x61 1 0,14
+
+!LS1R
+RESET
+PUSH "\e~"
+PUSH "\xe1"
+  putglyph 0x61 1 0,0
+PUSH "\e)0"
+PUSH "\xe1"
+  putglyph 0x2592 1 0,1
+
+!LS2R
+RESET
+PUSH "\e}"
+PUSH "\xe1"
+  putglyph 0x61 1 0,0
+PUSH "\e*0"
+PUSH "\xe1"
+  putglyph 0x2592 1 0,1
+
+!LS3R
+RESET
+PUSH "\e|"
+PUSH "\xe1"
+  putglyph 0x61 1 0,0
+PUSH "\e+0"
+PUSH "\xe1"
+  putglyph 0x2592 1 0,1
+
+UTF8 1
+
+!Mixed US-ASCII and UTF-8
+# U+0108 == 0xc4 0x88
+RESET
+PUSH "\e(B"
+PUSH "AB\xc4\x88D"
+  putglyph 0x0041 1 0,0
+  putglyph 0x0042 1 0,1
+  putglyph 0x0108 1 0,2
+  putglyph 0x0044 1 0,3
diff --git a/src/libvterm/t/15state_mode.test b/src/libvterm/t/15state_mode.test
new file mode 100644
index 0000000..b7917ad
--- /dev/null
+++ b/src/libvterm/t/15state_mode.test
@@ -0,0 +1,86 @@
+INIT
+UTF8 1
+WANTSTATE gme
+
+!Insert/Replace Mode
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "AC\e[DB"
+  putglyph 0x41 1 0,0
+  putglyph 0x43 1 0,1
+  putglyph 0x42 1 0,1
+PUSH "\e[4h"
+PUSH "\e[G"
+PUSH "AC\e[DB"
+  moverect 0..1,0..79 -> 0..1,1..80
+  erase 0..1,0..1
+  putglyph 0x41 1 0,0
+  moverect 0..1,1..79 -> 0..1,2..80
+  erase 0..1,1..2
+  putglyph 0x43 1 0,1
+  moverect 0..1,1..79 -> 0..1,2..80
+  erase 0..1,1..2
+  putglyph 0x42 1 0,1
+
+!Insert mode only happens once for UTF-8 combining
+PUSH "e"
+  moverect 0..1,2..79 -> 0..1,3..80
+  erase 0..1,2..3
+  putglyph 0x65 1 0,2
+PUSH "\xCC\x81"
+  putglyph 0x65,0x301 1 0,2
+
+!Newline/Linefeed mode
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "\e[5G\n"
+  ?cursor = 1,4
+PUSH "\e[20h"
+PUSH "\e[5G\n"
+  ?cursor = 2,0
+
+!DEC origin mode
+RESET
+  erase 0..25,0..80
+  ?cursor = 0,0
+PUSH "\e[5;15r"
+PUSH "\e[H"
+  ?cursor = 0,0
+PUSH "\e[3;3H"
+  ?cursor = 2,2
+PUSH "\e[?6h"
+PUSH "\e[H"
+  ?cursor = 4,0
+PUSH "\e[3;3H"
+  ?cursor = 6,2
+
+!DECRQM on DECOM
+PUSH "\e[?6h"
+PUSH "\e[?6\$p"
+  output "\e[?6;1\$y"
+PUSH "\e[?6l"
+PUSH "\e[?6\$p"
+  output "\e[?6;2\$y"
+
+!Origin mode with DECSLRM
+PUSH "\e[?6h"
+PUSH "\e[?69h"
+PUSH "\e[20;60s"
+PUSH "\e[H"
+  ?cursor = 4,19
+
+PUSH "\e[?69l"
+
+!Origin mode bounds cursor to scrolling region
+PUSH "\e[H"
+PUSH "\e[10A"
+  ?cursor = 4,0
+PUSH "\e[20B"
+  ?cursor = 14,0
+
+!Origin mode without scroll region
+PUSH "\e[?6l"
+PUSH "\e[r\e[?6h"
+  ?cursor = 0,0
diff --git a/src/libvterm/t/16state_resize.test b/src/libvterm/t/16state_resize.test
new file mode 100644
index 0000000..42c77c7
--- /dev/null
+++ b/src/libvterm/t/16state_resize.test
@@ -0,0 +1,48 @@
+INIT
+WANTSTATE g
+
+!Placement
+RESET
+PUSH "AB\e[79GCDE"
+  putglyph 0x41 1 0,0
+  putglyph 0x42 1 0,1
+  putglyph 0x43 1 0,78
+  putglyph 0x44 1 0,79
+  putglyph 0x45 1 1,0
+
+!Resize
+RESET
+RESIZE 27,85
+PUSH "AB\e[79GCDE"
+  putglyph 0x41 1 0,0
+  putglyph 0x42 1 0,1
+  putglyph 0x43 1 0,78
+  putglyph 0x44 1 0,79
+  putglyph 0x45 1 0,80
+  ?cursor = 0,81
+
+!Resize without reset
+RESIZE 28,90
+  ?cursor = 0,81
+PUSH "FGHI"
+  putglyph 0x46 1 0,81
+  putglyph 0x47 1 0,82
+  putglyph 0x48 1 0,83
+  putglyph 0x49 1 0,84
+  ?cursor = 0,85
+
+!Resize shrink moves cursor
+RESIZE 25,80
+  ?cursor = 0,79
+
+!Resize grow doesn't cancel phantom
+RESET
+PUSH "\e[79GAB"
+  putglyph 0x41 1 0,78
+  putglyph 0x42 1 0,79
+  ?cursor = 0,79
+RESIZE 30,100
+  ?cursor = 0,80
+PUSH "C"
+  putglyph 0x43 1 0,80
+  ?cursor = 0,81
diff --git a/src/libvterm/t/17state_mouse.test b/src/libvterm/t/17state_mouse.test
new file mode 100644
index 0000000..e5ba29b
--- /dev/null
+++ b/src/libvterm/t/17state_mouse.test
@@ -0,0 +1,181 @@
+INIT
+WANTSTATE p
+
+!DECRQM on with mouse off
+PUSH "\e[?1000\$p"
+  output "\e[?1000;2\$y"
+PUSH "\e[?1002\$p"
+  output "\e[?1002;2\$y"
+PUSH "\e[?1003\$p"
+  output "\e[?1003;2\$y"
+
+!Mouse in simple button report mode
+RESET
+  settermprop 1 true
+  settermprop 2 true
+  settermprop 7 1
+PUSH "\e[?1000h"
+  settermprop 8 1
+
+!Press 1
+MOUSEMOVE 0,0 0
+MOUSEBTN d 1 0
+  output "\e[M\x20\x21\x21"
+
+!Release 1
+MOUSEBTN u 1 0
+  output "\e[M\x23\x21\x21"
+
+!Ctrl-Press 1
+MOUSEBTN d 1 C
+  output "\e[M\x30\x21\x21"
+MOUSEBTN u 1 C
+  output "\e[M\x33\x21\x21"
+
+!Button 2
+MOUSEBTN d 2 0
+  output "\e[M\x21\x21\x21"
+MOUSEBTN u 2 0
+  output "\e[M\x23\x21\x21"
+
+!Position
+MOUSEMOVE 10,20 0
+MOUSEBTN d 1 0
+  output "\e[M\x20\x35\x2b"
+
+MOUSEBTN u 1 0
+  output "\e[M\x23\x35\x2b"
+MOUSEMOVE 10,21 0
+  # no output
+
+!Wheel events
+MOUSEBTN d 4 0
+  output "\e[M\x60\x36\x2b"
+MOUSEBTN d 4 0
+  output "\e[M\x60\x36\x2b"
+MOUSEBTN d 5 0
+  output "\e[M\x61\x36\x2b"
+
+!DECRQM on mouse button mode
+PUSH "\e[?1000\$p"
+  output "\e[?1000;1\$y"
+PUSH "\e[?1002\$p"
+  output "\e[?1002;2\$y"
+PUSH "\e[?1003\$p"
+  output "\e[?1003;2\$y"
+
+!Drag events
+RESET
+  settermprop 1 true
+  settermprop 2 true
+  settermprop 7 1
+PUSH "\e[?1002h"
+  settermprop 8 2
+
+MOUSEMOVE 5,5 0
+MOUSEBTN d 1 0
+  output "\e[M\x20\x26\x26"
+MOUSEMOVE 5,6 0
+  output "\e[M\x40\x27\x26"
+MOUSEMOVE 6,6 0
+  output "\e[M\x40\x27\x27"
+MOUSEMOVE 6,6 0
+  # no output
+MOUSEBTN u 1 0
+  output "\e[M\x23\x27\x27"
+MOUSEMOVE 6,7
+  # no output
+
+!DECRQM on mouse drag mode
+PUSH "\e[?1000\$p"
+  output "\e[?1000;2\$y"
+PUSH "\e[?1002\$p"
+  output "\e[?1002;1\$y"
+PUSH "\e[?1003\$p"
+  output "\e[?1003;2\$y"
+
+!Non-drag motion events
+PUSH "\e[?1003h"
+  settermprop 8 3
+
+MOUSEMOVE 6,8 0
+  output "\e[M\x43\x29\x27"
+
+!DECRQM on mouse motion mode
+PUSH "\e[?1000\$p"
+  output "\e[?1000;2\$y"
+PUSH "\e[?1002\$p"
+  output "\e[?1002;2\$y"
+PUSH "\e[?1003\$p"
+  output "\e[?1003;1\$y"
+
+!Bounds checking
+MOUSEMOVE 300,300 0
+  output "\e[M\x43\xff\xff"
+MOUSEBTN d 1 0
+  output "\e[M\x20\xff\xff"
+MOUSEBTN u 1 0
+  output "\e[M\x23\xff\xff"
+
+!DECRQM on standard encoding mode
+PUSH "\e[?1005\$p"
+  output "\e[?1005;2\$y"
+PUSH "\e[?1006\$p"
+  output "\e[?1006;2\$y"
+PUSH "\e[?1015\$p"
+  output "\e[?1015;2\$y"
+
+!UTF-8 extended encoding mode
+# 300 + 32 + 1 = 333 = U+014d = \xc5\x8d
+PUSH "\e[?1005h"
+MOUSEBTN d 1 0
+  output "\e[M\x20\xc5\x8d\xc5\x8d"
+MOUSEBTN u 1 0
+  output "\e[M\x23\xc5\x8d\xc5\x8d"
+
+!DECRQM on UTF-8 extended encoding mode
+PUSH "\e[?1005\$p"
+  output "\e[?1005;1\$y"
+PUSH "\e[?1006\$p"
+  output "\e[?1006;2\$y"
+PUSH "\e[?1015\$p"
+  output "\e[?1015;2\$y"
+
+!SGR extended encoding mode
+PUSH "\e[?1006h"
+MOUSEBTN d 1 0
+  output "\e[<0;301;301M"
+MOUSEBTN u 1 0
+  output "\e[<0;301;301m"
+
+!DECRQM on SGR extended encoding mode
+PUSH "\e[?1005\$p"
+  output "\e[?1005;2\$y"
+PUSH "\e[?1006\$p"
+  output "\e[?1006;1\$y"
+PUSH "\e[?1015\$p"
+  output "\e[?1015;2\$y"
+
+!rxvt extended encoding mode
+PUSH "\e[?1015h"
+MOUSEBTN d 1 0
+  output "\e[0;301;301M"
+MOUSEBTN u 1 0
+  output "\e[3;301;301M"
+
+!DECRQM on rxvt extended encoding mode
+PUSH "\e[?1005\$p"
+  output "\e[?1005;2\$y"
+PUSH "\e[?1006\$p"
+  output "\e[?1006;2\$y"
+PUSH "\e[?1015\$p"
+  output "\e[?1015;1\$y"
+
+!Mouse disabled reports nothing
+RESET
+  settermprop 1 true
+  settermprop 2 true
+  settermprop 7 1
+MOUSEMOVE 0,0 0
+MOUSEBTN d 1 0
+MOUSEBTN u 1 0
diff --git a/src/libvterm/t/18state_termprops.test b/src/libvterm/t/18state_termprops.test
new file mode 100644
index 0000000..83c333f
--- /dev/null
+++ b/src/libvterm/t/18state_termprops.test
@@ -0,0 +1,42 @@
+INIT
+WANTSTATE p
+
+RESET
+  settermprop 1 true
+  settermprop 2 true
+  settermprop 7 1
+
+!Cursor visibility
+PUSH "\e[?25h"
+  settermprop 1 true
+PUSH "\e[?25\$p"
+  output "\e[?25;1\$y"
+PUSH "\e[?25l"
+  settermprop 1 false
+PUSH "\e[?25\$p"
+  output "\e[?25;2\$y"
+
+!Cursor blink
+PUSH "\e[?12h"
+  settermprop 2 true
+PUSH "\e[?12\$p"
+  output "\e[?12;1\$y"
+PUSH "\e[?12l"
+  settermprop 2 false
+PUSH "\e[?12\$p"
+  output "\e[?12;2\$y"
+
+!Cursor shape
+PUSH "\e[3 q"
+  settermprop 2 true
+  settermprop 7 2
+
+!Title
+PUSH "\e]2;Here is my title\a"
+  settermprop 4 ["Here is my title"]
+
+!Title split write
+PUSH "\e]2;Here is"
+  settermprop 4 ["Here is"
+PUSH " another title\a"
+  settermprop 4 " another title"]
diff --git a/src/libvterm/t/20state_wrapping.test b/src/libvterm/t/20state_wrapping.test
new file mode 100644
index 0000000..606fa06
--- /dev/null
+++ b/src/libvterm/t/20state_wrapping.test
@@ -0,0 +1,69 @@
+INIT
+UTF8 1
+WANTSTATE gm
+
+!79th Column
+PUSH "\e[75G"
+PUSH "A"x5
+  putglyph 0x41 1 0,74
+  putglyph 0x41 1 0,75
+  putglyph 0x41 1 0,76
+  putglyph 0x41 1 0,77
+  putglyph 0x41 1 0,78
+  ?cursor = 0,79
+
+!80th Column Phantom
+PUSH "A"
+  putglyph 0x41 1 0,79
+  ?cursor = 0,79
+
+!Line Wraparound
+PUSH "B"
+  putglyph 0x42 1 1,0
+  ?cursor = 1,1
+
+!Line Wraparound during combined write
+PUSH "\e[78G"
+PUSH "BBBCC"
+  putglyph 0x42 1 1,77
+  putglyph 0x42 1 1,78
+  putglyph 0x42 1 1,79
+  putglyph 0x43 1 2,0
+  putglyph 0x43 1 2,1
+  ?cursor = 2,2
+
+!DEC Auto Wrap Mode
+RESET
+PUSH "\e[?7l"
+PUSH "\e[75G"
+PUSH "D"x6
+  putglyph 0x44 1 0,74
+  putglyph 0x44 1 0,75
+  putglyph 0x44 1 0,76
+  putglyph 0x44 1 0,77
+  putglyph 0x44 1 0,78
+  putglyph 0x44 1 0,79
+  ?cursor = 0,79
+PUSH "D"
+  putglyph 0x44 1 0,79
+  ?cursor = 0,79
+PUSH "\e[?7h"
+
+!80th column causes linefeed on wraparound
+PUSH "\e[25;78HABC"
+  putglyph 0x41 1 24,77
+  putglyph 0x42 1 24,78
+  putglyph 0x43 1 24,79
+  ?cursor = 24,79
+PUSH "D"
+  moverect 1..25,0..80 -> 0..24,0..80
+  putglyph 0x44 1 24,0
+
+!80th column phantom linefeed phantom cancelled by explicit cursor move
+PUSH "\e[25;78HABC"
+  putglyph 0x41 1 24,77
+  putglyph 0x42 1 24,78
+  putglyph 0x43 1 24,79
+  ?cursor = 24,79
+PUSH "\e[25;1HD"
+  putglyph 0x44 1 24,0
diff --git a/src/libvterm/t/21state_tabstops.test b/src/libvterm/t/21state_tabstops.test
new file mode 100644
index 0000000..df4a589
--- /dev/null
+++ b/src/libvterm/t/21state_tabstops.test
@@ -0,0 +1,60 @@
+INIT
+WANTSTATE g
+
+!Initial
+RESET
+PUSH "\tX"
+  putglyph 0x58 1 0,8
+PUSH "\tX"
+  putglyph 0x58 1 0,16
+  ?cursor = 0,17
+
+!HTS
+PUSH "\e[5G\eH"
+PUSH "\e[G\tX"
+  putglyph 0x58 1 0,4
+  ?cursor = 0,5
+
+!TBC 0
+PUSH "\e[9G\e[g"
+PUSH "\e[G\tX\tX"
+  putglyph 0x58 1 0,4
+  putglyph 0x58 1 0,16
+  ?cursor = 0,17
+
+!TBC 3
+PUSH "\e[3g\e[50G\eH\e[G"
+  ?cursor = 0,0
+PUSH "\tX"
+  putglyph 0x58 1 0,49
+  ?cursor = 0,50
+
+!Tabstops after resize
+RESET
+RESIZE 30,100
+# Should be 100/8 = 12 tabstops
+PUSH "\tX"
+  putglyph 0x58 1 0,8
+PUSH "\tX"
+  putglyph 0x58 1 0,16
+PUSH "\tX"
+  putglyph 0x58 1 0,24
+PUSH "\tX"
+  putglyph 0x58 1 0,32
+PUSH "\tX"
+  putglyph 0x58 1 0,40
+PUSH "\tX"
+  putglyph 0x58 1 0,48
+PUSH "\tX"
+  putglyph 0x58 1 0,56
+PUSH "\tX"
+  putglyph 0x58 1 0,64
+PUSH "\tX"
+  putglyph 0x58 1 0,72
+PUSH "\tX"
+  putglyph 0x58 1 0,80
+PUSH "\tX"
+  putglyph 0x58 1 0,88
+PUSH "\tX"
+  putglyph 0x58 1 0,96
+  ?cursor = 0,97
diff --git a/src/libvterm/t/22state_save.test b/src/libvterm/t/22state_save.test
new file mode 100644
index 0000000..81e9226
--- /dev/null
+++ b/src/libvterm/t/22state_save.test
@@ -0,0 +1,64 @@
+INIT
+WANTSTATE p
+
+RESET
+  settermprop 1 true
+  settermprop 2 true
+  settermprop 7 1
+
+!Set up state
+PUSH "\e[2;2H"
+  ?cursor = 1,1
+PUSH "\e[1m"
+  ?pen bold = on
+
+!Save
+PUSH "\e[?1048h"
+
+!Change state
+PUSH "\e[5;5H"
+  ?cursor = 4,4
+PUSH "\e[4 q"
+  settermprop 2 false
+  settermprop 7 2
+PUSH "\e[22;4m"
+  ?pen bold = off
+  ?pen underline = 1
+
+!Restore
+PUSH "\e[?1048l"
+  settermprop 1 true
+  settermprop 2 true
+  settermprop 7 1
+  ?cursor = 1,1
+  ?pen bold = on
+  ?pen underline = 0
+
+!Save/restore using DECSC/DECRC
+PUSH "\e[2;2H\e7"
+  ?cursor = 1,1
+
+PUSH "\e[5;5H"
+  ?cursor = 4,4
+PUSH "\e8"
+  settermprop 1 true
+  settermprop 2 true
+  settermprop 7 1
+  ?cursor = 1,1
+
+!Save twice, restore twice happens on both edge transitions
+PUSH "\e[2;10H\e[?1048h\e[6;10H\e[?1048h"
+PUSH "\e[H"
+  ?cursor = 0,0
+PUSH "\e[?1048l"
+  settermprop 1 true
+  settermprop 2 true
+  settermprop 7 1
+  ?cursor = 5,9
+PUSH "\e[H"
+  ?cursor = 0,0
+PUSH "\e[?1048l"
+  settermprop 1 true
+  settermprop 2 true
+  settermprop 7 1
+  ?cursor = 5,9
diff --git a/src/libvterm/t/25state_input.test b/src/libvterm/t/25state_input.test
new file mode 100644
index 0000000..4eb4c6a
--- /dev/null
+++ b/src/libvterm/t/25state_input.test
@@ -0,0 +1,155 @@
+INIT
+WANTSTATE
+
+!Unmodified ASCII
+INCHAR 0 41
+  output "A"
+INCHAR 0 61
+  output "a"
+
+!Ctrl modifier on ASCII letters
+INCHAR C 41
+  output "\e[65;5u"
+INCHAR C 61
+  output "\x01"
+
+!Alt modifier on ASCII letters
+INCHAR A 41
+  output "\eA"
+INCHAR A 61
+  output "\ea"
+
+!Ctrl-Alt modifier on ASCII letters
+INCHAR CA 41
+  output "\e[65;7u"
+INCHAR CA 61
+  output "\e\x01"
+
+!Special handling of Ctrl-I
+INCHAR 0 49
+  output "I"
+INCHAR 0 69
+  output "i"
+INCHAR C 49
+  output "\e[73;5u"
+INCHAR C 69
+  output "\e[105;5u"
+INCHAR A 49
+  output "\eI"
+INCHAR A 69
+  output "\ei"
+INCHAR CA 49
+  output "\e[73;7u"
+INCHAR CA 69
+  output "\e[105;7u"
+
+!Special handling of Space
+INCHAR 0 20
+  output " "
+INCHAR S 20
+  output "\e[32;2u"
+INCHAR C 20
+  output "\0"
+INCHAR SC 20
+  output "\e[32;6u"
+INCHAR A 20
+  output "\e "
+INCHAR SA 20
+  output "\e[32;4u"
+INCHAR CA 20
+  output "\e\0"
+INCHAR SCA 20
+  output "\e[32;8u"
+
+!Cursor keys in reset (cursor) mode
+INKEY 0 Up
+  output "\e[A"
+INKEY S Up
+  output "\e[1;2A"
+INKEY C Up
+  output "\e[1;5A"
+INKEY SC Up
+  output "\e[1;6A"
+INKEY A Up
+  output "\e[1;3A"
+INKEY SA Up
+  output "\e[1;4A"
+INKEY CA Up
+  output "\e[1;7A"
+INKEY SCA Up
+  output "\e[1;8A"
+
+!Cursor keys in application mode
+PUSH "\e[?1h"
+# Plain "Up" should be SS3 A now
+INKEY 0 Up
+  output "\eOA"
+# Modified keys should still use CSI
+INKEY S Up
+  output "\e[1;2A"
+INKEY C Up
+  output "\e[1;5A"
+
+!Shift-Tab should be different
+INKEY 0 Tab
+  output "\x09"
+INKEY S Tab
+  output "\e[Z"
+INKEY C Tab
+  output "\e[9;5u"
+INKEY A Tab
+  output "\e\x09"
+INKEY CA Tab
+  output "\e[9;7u"
+
+!Enter in linefeed mode
+INKEY 0 Enter
+  output "\x0d"
+
+!Enter in newline mode
+PUSH "\e[20h"
+INKEY 0 Enter
+  output "\x0d\x0a"
+
+!Unmodified F1 is SS3 P
+INKEY 0 F1
+  output "\eOP"
+
+!Modified F1 is CSI P
+INKEY S F1
+  output "\e[1;2P"
+INKEY A F1
+  output "\e[1;3P"
+INKEY C F1
+  output "\e[1;5P"
+
+!Keypad in DECKPNM
+INKEY 0 KP0
+  output "0"
+
+!Keypad in DECKPAM
+PUSH "\e="
+INKEY 0 KP0
+  output "\eOp"
+
+!Bracketed paste mode off
+PASTE START
+PASTE END
+
+!Bracketed paste mode on
+PUSH "\e[?2004h"
+PASTE START
+  output "\e[200~"
+PASTE END
+  output "\e[201~"
+
+!Focus reporting disabled
+FOCUS IN
+FOCUS OUT
+
+!Focus reporting enabled
+PUSH "\e[?1004h"
+FOCUS IN
+  output "\e[I"
+FOCUS OUT
+  output "\e[O"
diff --git a/src/libvterm/t/26state_query.test b/src/libvterm/t/26state_query.test
new file mode 100644
index 0000000..41e7cf8
--- /dev/null
+++ b/src/libvterm/t/26state_query.test
@@ -0,0 +1,67 @@
+INIT
+WANTSTATE
+
+!DA
+RESET
+PUSH "\e[c"
+  output "\e[?1;2c"
+
+!XTVERSION
+RESET
+PUSH "\e[>q"
+  output "\eP>|libvterm(0.3)\e\\"
+
+!DSR
+RESET
+PUSH "\e[5n"
+  output "\e[0n"
+
+!CPR
+PUSH "\e[6n"
+  output "\e[1;1R"
+PUSH "\e[10;10H\e[6n"
+  output "\e[10;10R"
+
+!DECCPR
+PUSH "\e[?6n"
+  output "\e[?10;10R"
+
+!DECRQSS on DECSCUSR
+PUSH "\e[3 q"
+PUSH "\eP\$q q\e\\"
+  output "\eP1\$r3 q\e\\"
+
+!DECRQSS on SGR
+PUSH "\e[1;5;7m"
+PUSH "\eP\$qm\e\\"
+  output "\eP1\$r1;5;7m\e\\"
+
+!DECRQSS on SGR ANSI colours
+PUSH "\e[0;31;42m"
+PUSH "\eP\$qm\e\\"
+  output "\eP1\$r31;42m\e\\"
+
+!DECRQSS on SGR ANSI hi-bright colours
+PUSH "\e[0;93;104m"
+PUSH "\eP\$qm\e\\"
+  output "\eP1\$r93;104m\e\\"
+
+##!DECRQSS on SGR 256-palette colours
+#PUSH "\e[0;38:5:56;48:5:78m"
+#PUSH "\eP\$qm\e\\"
+#  output "\eP1\$r38:5:56;48:5:78m\e\\"
+
+!DECRQSS on SGR RGB8 colours
+PUSH "\e[0;38:2:24:68:112;48:2:13:57:101m"
+PUSH "\eP\$qm\e\\"
+  output "\eP1\$r38:2:24:68:112;48:2:13:57:101m\e\\"
+
+!S8C1T on DSR
+PUSH "\e G"
+PUSH "\e[5n"
+  output "\x{9b}0n"
+PUSH "\e F"
+
+#!Truncation on attempted buffer overflow
+#PUSH "\e[6n" x 30
+#  output "\e[10;10R" x 25
diff --git a/src/libvterm/t/27state_reset.test b/src/libvterm/t/27state_reset.test
new file mode 100644
index 0000000..254f994
--- /dev/null
+++ b/src/libvterm/t/27state_reset.test
@@ -0,0 +1,32 @@
+INIT
+WANTSTATE
+
+RESET
+
+!RIS homes cursor
+PUSH "\e[5;5H"
+  ?cursor = 4,4
+WANTSTATE +m
+PUSH "\ec"
+  ?cursor = 0,0
+WANTSTATE -m
+
+!RIS cancels scrolling region
+PUSH "\e[5;10r"
+WANTSTATE +s
+PUSH "\ec\e[25H\n"
+  scrollrect 0..25,0..80 => +1,+0
+WANTSTATE -s
+
+!RIS erases screen
+PUSH "ABCDE"
+WANTSTATE +e
+PUSH "\ec"
+  erase 0..25,0..80
+WANTSTATE -e
+
+!RIS clears tabstops
+PUSH "\e[5G\eH\e[G\t"
+  ?cursor = 0,4
+PUSH "\ec\t"
+  ?cursor = 0,8
diff --git a/src/libvterm/t/28state_dbl_wh.test b/src/libvterm/t/28state_dbl_wh.test
new file mode 100644
index 0000000..596194d
--- /dev/null
+++ b/src/libvterm/t/28state_dbl_wh.test
@@ -0,0 +1,61 @@
+INIT
+WANTSTATE g
+
+!Single Width, Single Height
+RESET
+PUSH "\e#5"
+PUSH "Hello"
+  putglyph 0x48 1 0,0
+  putglyph 0x65 1 0,1
+  putglyph 0x6c 1 0,2
+  putglyph 0x6c 1 0,3
+  putglyph 0x6f 1 0,4
+
+!Double Width, Single Height
+RESET
+PUSH "\e#6"
+PUSH "Hello"
+  putglyph 0x48 1 0,0 dwl
+  putglyph 0x65 1 0,1 dwl
+  putglyph 0x6c 1 0,2 dwl
+  putglyph 0x6c 1 0,3 dwl
+  putglyph 0x6f 1 0,4 dwl
+  ?cursor = 0,5
+PUSH "\e[40GAB"
+  putglyph 0x41 1 0,39 dwl
+  putglyph 0x42 1 1,0
+  ?cursor = 1,1
+
+!Double Height
+RESET
+PUSH "\e#3"
+PUSH "Hello"
+  putglyph 0x48 1 0,0 dwl dhl-top
+  putglyph 0x65 1 0,1 dwl dhl-top
+  putglyph 0x6c 1 0,2 dwl dhl-top
+  putglyph 0x6c 1 0,3 dwl dhl-top
+  putglyph 0x6f 1 0,4 dwl dhl-top
+  ?cursor = 0,5
+PUSH "\r\n\e#4"
+PUSH "Hello"
+  putglyph 0x48 1 1,0 dwl dhl-bottom
+  putglyph 0x65 1 1,1 dwl dhl-bottom
+  putglyph 0x6c 1 1,2 dwl dhl-bottom
+  putglyph 0x6c 1 1,3 dwl dhl-bottom
+  putglyph 0x6f 1 1,4 dwl dhl-bottom
+  ?cursor = 1,5
+
+!Double Width scrolling
+RESET
+PUSH "\e[20H\e#6ABC"
+  putglyph 0x41 1 19,0 dwl
+  putglyph 0x42 1 19,1 dwl
+  putglyph 0x43 1 19,2 dwl
+PUSH "\e[25H\n"
+PUSH "\e[19;4HDE"
+  putglyph 0x44 1 18,3 dwl
+  putglyph 0x45 1 18,4 dwl
+PUSH "\e[H\eM"
+PUSH "\e[20;6HFG"
+  putglyph 0x46 1 19,5 dwl
+  putglyph 0x47 1 19,6 dwl
diff --git a/src/libvterm/t/29state_fallback.test b/src/libvterm/t/29state_fallback.test
new file mode 100644
index 0000000..4ab2e18
--- /dev/null
+++ b/src/libvterm/t/29state_fallback.test
@@ -0,0 +1,31 @@
+INIT
+WANTSTATE f
+RESET
+
+!Unrecognised control 
+PUSH "\x03"
+  control 03
+
+!Unrecognised CSI
+PUSH "\e[?15;2z"
+  csi 0x7a L=3f 15,2
+
+!Unrecognised OSC
+PUSH "\e]27;Something\e\\"
+  osc [27 "Something"]
+
+!Unrecognised DCS
+PUSH "\ePz123\e\\"
+  dcs ["z123"]
+
+!Unrecognised APC
+PUSH "\e_z123\e\\"
+  apc ["z123"]
+
+!Unrecognised PM
+PUSH "\e^z123\e\\"
+  pm ["z123"]
+
+!Unrecognised SOS
+PUSH "\eXz123\e\\"
+  sos ["z123"]
diff --git a/src/libvterm/t/30state_pen.test b/src/libvterm/t/30state_pen.test
new file mode 100644
index 0000000..92cf01d
--- /dev/null
+++ b/src/libvterm/t/30state_pen.test
@@ -0,0 +1,125 @@
+INIT
+UTF8 1
+WANTSTATE
+
+!Reset
+PUSH "\e[m"
+  ?pen bold = off
+  ?pen underline = 0
+  ?pen italic = off
+  ?pen blink = off
+  ?pen reverse = off
+  ?pen font = 0
+  ?pen foreground = rgb(240,240,240,is_default_fg)
+  ?pen background = rgb(0,0,0,is_default_bg)
+
+!Bold
+PUSH "\e[1m"
+  ?pen bold = on
+PUSH "\e[22m"
+  ?pen bold = off
+PUSH "\e[1m\e[m"
+  ?pen bold = off
+
+!Underline
+PUSH "\e[4m"
+  ?pen underline = 1
+PUSH "\e[21m"
+  ?pen underline = 2
+PUSH "\e[24m"
+  ?pen underline = 0
+PUSH "\e[4m\e[4:0m"
+  ?pen underline = 0
+PUSH "\e[4:1m"
+  ?pen underline = 1
+PUSH "\e[4:2m"
+  ?pen underline = 2
+PUSH "\e[4:3m"
+  ?pen underline = 3
+PUSH "\e[4m\e[m"
+  ?pen underline = 0
+
+!Italic
+PUSH "\e[3m"
+  ?pen italic = on
+PUSH "\e[23m"
+  ?pen italic = off
+PUSH "\e[3m\e[m"
+  ?pen italic = off
+
+!Blink
+PUSH "\e[5m"
+  ?pen blink = on
+PUSH "\e[25m"
+  ?pen blink = off
+PUSH "\e[5m\e[m"
+  ?pen blink = off
+
+!Reverse
+PUSH "\e[7m"
+  ?pen reverse = on
+PUSH "\e[27m"
+  ?pen reverse = off
+PUSH "\e[7m\e[m"
+  ?pen reverse = off
+
+!Font Selection
+PUSH "\e[11m"
+  ?pen font = 1
+PUSH "\e[19m"
+  ?pen font = 9
+PUSH "\e[10m"
+  ?pen font = 0
+PUSH "\e[11m\e[m"
+  ?pen font = 0
+
+!Foreground
+PUSH "\e[31m"
+  ?pen foreground = idx(1)
+PUSH "\e[32m"
+  ?pen foreground = idx(2)
+PUSH "\e[34m"
+  ?pen foreground = idx(4)
+PUSH "\e[91m"
+  ?pen foreground = idx(9)
+PUSH "\e[38:2:10:20:30m"
+  ?pen foreground = rgb(10,20,30)
+PUSH "\e[38:5:1m"
+  ?pen foreground = idx(1)
+PUSH "\e[39m"
+  ?pen foreground = rgb(240,240,240,is_default_fg)
+
+!Background
+PUSH "\e[41m"
+  ?pen background = idx(1)
+PUSH "\e[42m"
+  ?pen background = idx(2)
+PUSH "\e[44m"
+  ?pen background = idx(4)
+PUSH "\e[101m"
+  ?pen background = idx(9)
+PUSH "\e[48:2:10:20:30m"
+  ?pen background = rgb(10,20,30)
+PUSH "\e[48:5:1m"
+  ?pen background = idx(1)
+PUSH "\e[49m"
+  ?pen background = rgb(0,0,0,is_default_bg)
+
+!Bold+ANSI colour == highbright
+PUSH "\e[m\e[1;37m"
+  ?pen bold = on
+  ?pen foreground = idx(15)
+PUSH "\e[m\e[37;1m"
+  ?pen bold = on
+  ?pen foreground = idx(15)
+
+!Super/Subscript
+PUSH "\e[73m"
+  ?pen small = on
+  ?pen baseline = raise
+PUSH "\e[74m"
+  ?pen small = on
+  ?pen baseline = lower
+PUSH "\e[75m"
+  ?pen small = off
+  ?pen baseline = normal
diff --git a/src/libvterm/t/31state_rep.test b/src/libvterm/t/31state_rep.test
new file mode 100644
index 0000000..f820e67
--- /dev/null
+++ b/src/libvterm/t/31state_rep.test
@@ -0,0 +1,128 @@
+INIT
+UTF8 1
+WANTSTATE g
+
+!REP no argument
+RESET
+PUSH "a\e[b"
+  putglyph 0x61 1 0,0
+  putglyph 0x61 1 0,1
+
+!REP zero (zero should be interpreted as one)
+RESET
+PUSH "a\e[0b"
+  putglyph 0x61 1 0,0
+  putglyph 0x61 1 0,1
+
+!REP lowercase a times two
+RESET
+PUSH "a\e[2b"
+  putglyph 0x61 1 0,0
+  putglyph 0x61 1 0,1
+  putglyph 0x61 1 0,2
+
+!REP with UTF-8 1 char
+# U+00E9 = 0xC3 0xA9  name: LATIN SMALL LETTER E WITH ACUTE
+RESET
+PUSH "\xC3\xA9\e[b"
+  putglyph 0xe9 1 0,0
+  putglyph 0xe9 1 0,1
+
+!REP with UTF-8 wide char
+# U+00E9 = 0xC3 0xA9  name: LATIN SMALL LETTER E WITH ACUTE
+RESET
+PUSH "\xEF\xBC\x90\e[b"
+  putglyph 0xff10 2 0,0
+  putglyph 0xff10 2 0,2
+
+!REP with UTF-8 combining character
+RESET
+PUSH "e\xCC\x81\e[b"
+  putglyph 0x65,0x301 1 0,0
+  putglyph 0x65,0x301 1 0,1
+
+!REP till end of line
+RESET
+PUSH "a\e[1000bb"
+  putglyph 0x61 1 0,0
+  putglyph 0x61 1 0,1
+  putglyph 0x61 1 0,2
+  putglyph 0x61 1 0,3
+  putglyph 0x61 1 0,4
+  putglyph 0x61 1 0,5
+  putglyph 0x61 1 0,6
+  putglyph 0x61 1 0,7
+  putglyph 0x61 1 0,8
+  putglyph 0x61 1 0,9
+  putglyph 0x61 1 0,10
+  putglyph 0x61 1 0,11
+  putglyph 0x61 1 0,12
+  putglyph 0x61 1 0,13
+  putglyph 0x61 1 0,14
+  putglyph 0x61 1 0,15
+  putglyph 0x61 1 0,16
+  putglyph 0x61 1 0,17
+  putglyph 0x61 1 0,18
+  putglyph 0x61 1 0,19
+  putglyph 0x61 1 0,20
+  putglyph 0x61 1 0,21
+  putglyph 0x61 1 0,22
+  putglyph 0x61 1 0,23
+  putglyph 0x61 1 0,24
+  putglyph 0x61 1 0,25
+  putglyph 0x61 1 0,26
+  putglyph 0x61 1 0,27
+  putglyph 0x61 1 0,28
+  putglyph 0x61 1 0,29
+  putglyph 0x61 1 0,30
+  putglyph 0x61 1 0,31
+  putglyph 0x61 1 0,32
+  putglyph 0x61 1 0,33
+  putglyph 0x61 1 0,34
+  putglyph 0x61 1 0,35
+  putglyph 0x61 1 0,36
+  putglyph 0x61 1 0,37
+  putglyph 0x61 1 0,38
+  putglyph 0x61 1 0,39
+  putglyph 0x61 1 0,40
+  putglyph 0x61 1 0,41
+  putglyph 0x61 1 0,42
+  putglyph 0x61 1 0,43
+  putglyph 0x61 1 0,44
+  putglyph 0x61 1 0,45
+  putglyph 0x61 1 0,46
+  putglyph 0x61 1 0,47
+  putglyph 0x61 1 0,48
+  putglyph 0x61 1 0,49
+  putglyph 0x61 1 0,50
+  putglyph 0x61 1 0,51
+  putglyph 0x61 1 0,52
+  putglyph 0x61 1 0,53
+  putglyph 0x61 1 0,54
+  putglyph 0x61 1 0,55
+  putglyph 0x61 1 0,56
+  putglyph 0x61 1 0,57
+  putglyph 0x61 1 0,58
+  putglyph 0x61 1 0,59
+  putglyph 0x61 1 0,60
+  putglyph 0x61 1 0,61
+  putglyph 0x61 1 0,62
+  putglyph 0x61 1 0,63
+  putglyph 0x61 1 0,64
+  putglyph 0x61 1 0,65
+  putglyph 0x61 1 0,66
+  putglyph 0x61 1 0,67
+  putglyph 0x61 1 0,68
+  putglyph 0x61 1 0,69
+  putglyph 0x61 1 0,70
+  putglyph 0x61 1 0,71
+  putglyph 0x61 1 0,72
+  putglyph 0x61 1 0,73
+  putglyph 0x61 1 0,74
+  putglyph 0x61 1 0,75
+  putglyph 0x61 1 0,76
+  putglyph 0x61 1 0,77
+  putglyph 0x61 1 0,78
+  putglyph 0x61 1 0,79
+  putglyph 0x62 1 1,0
+
diff --git a/src/libvterm/t/32state_flow.test b/src/libvterm/t/32state_flow.test
new file mode 100644
index 0000000..84a13df
--- /dev/null
+++ b/src/libvterm/t/32state_flow.test
@@ -0,0 +1,28 @@
+INIT
+WANTSTATE
+
+# Many of these test cases inspired by
+#   https://blueprints.launchpad.net/libvterm/+spec/reflow-cases
+
+!Spillover text marks continuation on second line
+RESET
+PUSH "A"x100
+PUSH "\r\n"
+  ?lineinfo 0 =
+  ?lineinfo 1 = cont
+
+!CRLF in column 80 does not mark continuation
+RESET
+PUSH "B"x80
+PUSH "\r\n"
+PUSH "B"x20
+PUSH "\r\n"
+  ?lineinfo 0 =
+  ?lineinfo 1 =
+
+!EL cancels continuation of following line
+RESET
+PUSH "D"x100
+  ?lineinfo 1 = cont
+PUSH "\eM\e[79G\e[K"
+  ?lineinfo 1 =
diff --git a/src/libvterm/t/40state_selection.test b/src/libvterm/t/40state_selection.test
new file mode 100644
index 0000000..6ed8972
--- /dev/null
+++ b/src/libvterm/t/40state_selection.test
@@ -0,0 +1,55 @@
+INIT
+UTF8 1
+WANTSTATE
+
+!Set clipboard; final chunk len 4
+PUSH "\e]52;c;SGVsbG8s\e\\"
+  selection-set mask=0001 ["Hello,"]
+
+!Set clipboard; final chunk len 3
+PUSH "\e]52;c;SGVsbG8sIHc=\e\\"
+  selection-set mask=0001 ["Hello, w"]
+
+!Set clipboard; final chunk len 2
+PUSH "\e]52;c;SGVsbG8sIHdvcmxkCg==\e\\"
+  selection-set mask=0001 ["Hello, world\n"]
+
+!Set clipboard; split between chunks
+PUSH "\e]52;c;SGVs"
+  selection-set mask=0001 ["Hel"
+PUSH "bG8s\e\\"
+  selection-set mask=0001 "lo,"]
+
+!Set clipboard; split within chunk
+PUSH "\e]52;c;SGVsbG"
+  selection-set mask=0001 ["Hel"
+PUSH "8s\e\\"
+  selection-set mask=0001 "lo,"]
+
+!Query clipboard
+PUSH "\e]52;c;?\e\\"
+  selection-query mask=0001
+
+!Send clipboard; final chunk len 4
+SELECTION 1 ["Hello,"]
+  output "\e]52;c;SGVsbG8s\e\\"
+
+!Send clipboard; final chunk len 3
+SELECTION 1 ["Hello, w"]
+  output "\e]52;c;SGVsbG8sIHc=\e\\"
+
+!Send clipboard; final chunk len 2
+SELECTION 1 ["Hello, world\n"]
+  output "\e]52;c;SGVsbG8sIHdvcmxkCg==\e\\"
+
+!Send clipboard; split between chunks
+SELECTION 1 ["Hel"
+  output "\e]52;c;SGVs"
+SELECTION 1  "lo,"]
+  output "bG8s\e\\"
+
+!Send clipboard; split within chunk
+SELECTION 1 ["Hello"
+  output "\e]52;c;SGVs"
+SELECTION 1 ","]
+  output "bG8s\e\\"
diff --git a/src/libvterm/t/60screen_ascii.test b/src/libvterm/t/60screen_ascii.test
new file mode 100644
index 0000000..57729c5
--- /dev/null
+++ b/src/libvterm/t/60screen_ascii.test
@@ -0,0 +1,69 @@
+INIT
+WANTSCREEN ac
+
+!Get
+RESET
+PUSH "ABC"
+  movecursor 0,3
+  ?screen_chars 0,0,1,3 = "ABC"
+  ?screen_chars 0,0,1,80 = "ABC"
+  ?screen_text 0,0,1,3 = 0x41,0x42,0x43
+  ?screen_text 0,0,1,80 = 0x41,0x42,0x43
+  ?screen_cell 0,0 = {0x41} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+  ?screen_cell 0,1 = {0x42} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+  ?screen_cell 0,2 = {0x43} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+  ?screen_row 0 = "ABC"
+  ?screen_eol 0,0 = 0
+  ?screen_eol 0,2 = 0
+  ?screen_eol 0,3 = 1
+PUSH "\e[H"
+  movecursor 0,0
+  ?screen_row 0 = "ABC"
+  ?screen_text 0,0,1,80 = 0x41,0x42,0x43
+PUSH "E"
+  movecursor 0,1
+  ?screen_row 0 = "EBC"
+  ?screen_text 0,0,1,80 = 0x45,0x42,0x43
+
+WANTSCREEN -c
+
+!Erase
+RESET
+PUSH "ABCDE\e[H\e[K"
+  ?screen_row 0 = ""
+  ?screen_text 0,0,1,80 = 
+
+!Copycell
+RESET
+PUSH "ABC\e[H\e[@"
+PUSH "1"
+  ?screen_row 0 = "1ABC"
+
+RESET
+PUSH "ABC\e[H\e[P"
+  ?screen_chars 0,0,1,1 = "B"
+  ?screen_chars 0,1,1,2 = "C"
+  ?screen_chars 0,0,1,80 = "BC"
+
+!Space padding
+RESET
+PUSH "Hello\e[CWorld"
+  ?screen_row 0 = "Hello World"
+  ?screen_text 0,0,1,80 = 0x48,0x65,0x6c,0x6c,0x6f,0x20,0x57,0x6f,0x72,0x6c,0x64
+
+!Linefeed padding
+RESET
+PUSH "Hello\r\nWorld"
+  ?screen_chars 0,0,2,80 = "Hello\nWorld"
+  ?screen_text 0,0,2,80 = 0x48,0x65,0x6c,0x6c,0x6f,0x0a,0x57,0x6f,0x72,0x6c,0x64
+
+!Altscreen
+RESET
+PUSH "P"
+  ?screen_row 0 = "P"
+PUSH "\e[?1049h"
+  ?screen_row 0 = ""
+PUSH "\e[2K\e[HA"
+  ?screen_row 0 = "A"
+PUSH "\e[?1049l"
+  ?screen_row 0 = "P"
diff --git a/src/libvterm/t/61screen_unicode.test b/src/libvterm/t/61screen_unicode.test
new file mode 100644
index 0000000..8bde2bd
--- /dev/null
+++ b/src/libvterm/t/61screen_unicode.test
@@ -0,0 +1,47 @@
+INIT
+UTF8 1
+WANTSCREEN
+
+!Single width UTF-8
+# U+00C1 = 0xC3 0x81  name: LATIN CAPITAL LETTER A WITH ACUTE
+# U+00E9 = 0xC3 0xA9  name: LATIN SMALL LETTER E WITH ACUTE
+RESET
+PUSH "\xC3\x81\xC3\xA9"
+  ?screen_row 0 = 0xc1,0xe9
+  ?screen_text 0,0,1,80 = 0xc3,0x81,0xc3,0xa9
+  ?screen_cell 0,0 = {0xc1} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Wide char
+# U+FF10 = 0xEF 0xBC 0x90  name: FULLWIDTH DIGIT ZERO
+RESET
+PUSH "0123\e[H"
+PUSH "\xEF\xBC\x90"
+  ?screen_row 0 = 0xff10,0x32,0x33
+  ?screen_text 0,0,1,80 = 0xef,0xbc,0x90,0x32,0x33
+  ?screen_cell 0,0 = {0xff10} width=2 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Combining char
+# U+0301 = 0xCC 0x81  name: COMBINING ACUTE
+RESET
+PUSH "0123\e[H"
+PUSH "e\xCC\x81"
+  ?screen_row 0 = 0x65,0x301,0x31,0x32,0x33
+  ?screen_text 0,0,1,80 = 0x65,0xcc,0x81,0x31,0x32,0x33
+  ?screen_cell 0,0 = {0x65,0x301} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!10 combining accents should not crash
+RESET
+PUSH "e\xCC\x81\xCC\x82\xCC\x83\xCC\x84\xCC\x85\xCC\x86\xCC\x87\xCC\x88\xCC\x89\xCC\x8A"
+  ?screen_cell 0,0 = {0x65,0x301,0x302,0x303,0x304,0x305} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!40 combining accents in two split writes of 20 should not crash
+RESET
+PUSH "e\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81"
+PUSH  "\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81\xCC\x81"
+  ?screen_cell 0,0 = {0x65,0x301,0x301,0x301,0x301,0x301} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Outputting CJK doublewidth in 80th column should wraparound to next line and not crash"
+RESET
+PUSH "\e[80G\xEF\xBC\x90"
+  ?screen_cell 0,79 = {} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+  ?screen_cell 1,0 = {0xff10} width=2 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
diff --git a/src/libvterm/t/62screen_damage.test b/src/libvterm/t/62screen_damage.test
new file mode 100644
index 0000000..3b1b238
--- /dev/null
+++ b/src/libvterm/t/62screen_damage.test
@@ -0,0 +1,155 @@
+INIT
+WANTSCREEN aDb
+
+!Putglyph
+RESET
+  damage 0..25,0..80
+PUSH "123"
+  damage 0..1,0..1 = 0<31>
+  damage 0..1,1..2 = 0<32>
+  damage 0..1,2..3 = 0<33>
+
+!Erase
+PUSH "\e[H"
+PUSH "\e[3X"
+  damage 0..1,0..3
+
+!Scroll damages entire line in two chunks
+PUSH "\e[H\e[5@"
+  damage 0..1,5..80
+  damage 0..1,0..5
+
+!Scroll down damages entire screen in two chunks
+PUSH "\e[T"
+  damage 1..25,0..80
+  damage 0..1,0..80
+
+!Altscreen damages entire area
+PUSH "\e[?1049h"
+  damage 0..25,0..80
+PUSH "\e[?1049l"
+  damage 0..25,0..80
+
+WANTSCREEN m
+
+!Scroll invokes moverect but not damage
+PUSH "\e[5@"
+  moverect 0..1,0..75 -> 0..1,5..80
+  damage 0..1,0..5
+
+WANTSCREEN -m
+
+!Merge to cells
+RESET
+  damage 0..25,0..80
+DAMAGEMERGE CELL
+
+PUSH "A"
+  damage 0..1,0..1 = 0<41>
+PUSH "B"
+  damage 0..1,1..2 = 0<42>
+PUSH "C"
+  damage 0..1,2..3 = 0<43>
+
+!Merge entire rows
+RESET
+  damage 0..25,0..80
+DAMAGEMERGE ROW
+
+PUSH "ABCDE\r\nEFGH"
+  damage 0..1,0..5 = 0<41 42 43 44 45>
+DAMAGEFLUSH
+  damage 1..2,0..4 = 1<45 46 47 48>
+PUSH "\e[3;6r\e[6H\eD"
+  damage 2..5,0..80
+DAMAGEFLUSH
+  damage 5..6,0..80
+
+!Merge entire screen
+RESET
+  damage 0..25,0..80
+DAMAGEMERGE SCREEN
+
+PUSH "ABCDE\r\nEFGH"
+DAMAGEFLUSH
+  damage 0..2,0..5 = 0<41 42 43 44 45> 1<45 46 47 48>
+PUSH "\e[3;6r\e[6H\eD"
+DAMAGEFLUSH
+  damage 2..6,0..80
+
+!Merge entire screen with moverect
+WANTSCREEN m
+
+RESET
+  damage 0..25,0..80
+DAMAGEMERGE SCREEN
+
+PUSH "ABCDE\r\nEFGH"
+PUSH "\e[3;6r\e[6H\eD"
+  damage 0..2,0..5 = 0<41 42 43 44 45> 1<45 46 47 48>
+  moverect 3..6,0..80 -> 2..5,0..80
+DAMAGEFLUSH
+  damage 5..6,0..80
+
+!Merge scroll
+RESET
+  damage 0..25,0..80
+DAMAGEMERGE SCROLL
+
+PUSH "\e[H1\r\n2\r\n3"
+PUSH "\e[25H\n\n\n"
+  sb_pushline 80 = 31
+  sb_pushline 80 = 32
+  sb_pushline 80 = 33
+DAMAGEFLUSH
+  moverect 3..25,0..80 -> 0..22,0..80
+  damage 0..25,0..80
+
+!Merge scroll with damage
+PUSH "\e[25H"
+PUSH "ABCDE\r\nEFGH\r\n"
+  sb_pushline 80 =
+  sb_pushline 80 =
+DAMAGEFLUSH
+  moverect 2..25,0..80 -> 0..23,0..80
+  damage 22..25,0..80 = 22<41 42 43 44 45> 23<45 46 47 48>
+
+!Merge scroll with damage past region
+PUSH "\e[3;6r\e[6H1\r\n2\r\n3\r\n4\r\n5"
+DAMAGEFLUSH
+  damage 2..6,0..80 = 2<32> 3<33> 4<34> 5<35>
+
+!Damage entirely outside scroll region
+PUSH "\e[HABC\e[3;6r\e[6H\r\n6"
+  damage 0..1,0..3 = 0<41 42 43>
+DAMAGEFLUSH
+  moverect 3..6,0..80 -> 2..5,0..80
+  damage 5..6,0..80 = 5<36>
+
+!Damage overlapping scroll region
+PUSH "\e[H\e[2J"
+DAMAGEFLUSH
+  damage 0..25,0..80
+
+PUSH "\e[HABCD\r\nEFGH\r\nIJKL\e[2;5r\e[5H\r\nMNOP"
+DAMAGEFLUSH
+  moverect 2..5,0..80 -> 1..4,0..80
+  damage 0..5,0..80 = 0<41 42 43 44> 1<49 4A 4B 4C>
+  ## TODO: is this right?
+
+!Merge scroll*2 with damage
+RESET
+  damage 0..25,0..80
+DAMAGEMERGE SCROLL
+
+PUSH "\e[25H\r\nABCDE\b\b\b\e[2P\r\n"
+  sb_pushline 80 =
+  moverect 1..25,0..80 -> 0..24,0..80
+  damage 24..25,0..80 = 24<41 42 43 44 45>
+  moverect 24..25,4..80 -> 24..25,2..78
+  damage 24..25,78..80
+  sb_pushline 80 =
+DAMAGEFLUSH
+  moverect 1..25,0..80 -> 0..24,0..80
+  damage 24..25,0..80
+  ?screen_row 23 = "ABE"
diff --git a/src/libvterm/t/63screen_resize.test b/src/libvterm/t/63screen_resize.test
new file mode 100644
index 0000000..6835222
--- /dev/null
+++ b/src/libvterm/t/63screen_resize.test
@@ -0,0 +1,117 @@
+INIT
+WANTSTATE
+WANTSCREEN
+
+!Resize wider preserves cells
+RESET
+RESIZE 25,80
+PUSH "AB\r\nCD"
+  ?screen_chars 0,0,1,80 = "AB"
+  ?screen_chars 1,0,2,80 = "CD"
+RESIZE 25,100
+  ?screen_chars 0,0,1,100 = "AB"
+  ?screen_chars 1,0,2,100 = "CD"
+
+!Resize wider allows print in new area
+RESET
+RESIZE 25,80
+PUSH "AB\e[79GCD"
+  ?screen_chars 0,0,1,2 = "AB"
+  ?screen_chars 0,78,1,80 = "CD"
+RESIZE 25,100
+  ?screen_chars 0,0,1,2 = "AB"
+  ?screen_chars 0,78,1,80 = "CD"
+PUSH "E"
+  ?screen_chars 0,78,1,81 = "CDE"
+
+!Resize shorter with blanks just truncates
+RESET
+RESIZE 25,80
+PUSH "Top\e[10HLine 10"
+  ?screen_row 0 = "Top"
+  ?screen_row 9 = "Line 10"
+  ?cursor = 9,7
+RESIZE 20,80
+  ?screen_row 0 = "Top"
+  ?screen_row 9 = "Line 10"
+  ?cursor = 9,7
+
+!Resize shorter with content must scroll
+RESET
+RESIZE 25,80
+PUSH "Top\e[25HLine 25\e[15H"
+  ?screen_row 0 = "Top"
+  ?screen_row 24 = "Line 25"
+  ?cursor = 14,0
+WANTSCREEN b
+RESIZE 20,80
+  sb_pushline 80 = 54 6F 70
+  sb_pushline 80 =
+  sb_pushline 80 =
+  sb_pushline 80 =
+  sb_pushline 80 =
+  ?screen_row 0  = ""
+  ?screen_row 19 = "Line 25"
+  ?cursor = 9,0
+
+!Resize shorter does not lose line with cursor
+# See also https://github.com/neovim/libvterm/commit/1b745d29d45623aa8d22a7b9288c7b0e331c7088
+RESET
+WANTSCREEN -b
+RESIZE 25,80
+WANTSCREEN b
+PUSH "\e[24HLine 24\r\nLine 25\r\n"
+  sb_pushline 80 =
+  ?screen_row 23 = "Line 25"
+  ?cursor = 24,0
+RESIZE 24,80
+  sb_pushline 80 =
+  ?screen_row 22 = "Line 25"
+  ?cursor = 23,0
+
+!Resize shorter does not send the cursor to a negative row
+# See also https://github.com/vim/vim/pull/6141
+RESET
+WANTSCREEN -b
+RESIZE 25,80
+WANTSCREEN b
+PUSH "\e[24HLine 24\r\nLine 25\e[H"
+  ?cursor = 0,0
+RESIZE 20,80
+  sb_pushline 80 =
+  sb_pushline 80 =
+  sb_pushline 80 =
+  sb_pushline 80 =
+  sb_pushline 80 =
+  ?cursor = 0,0
+
+!Resize taller attempts to pop scrollback
+RESET
+WANTSCREEN -b
+RESIZE 25,80
+PUSH "Line 1\e[25HBottom\e[15H"
+  ?screen_row 0  = "Line 1"
+  ?screen_row 24 = "Bottom"
+  ?cursor = 14,0
+WANTSCREEN b
+RESIZE 30,80
+  sb_popline 80
+  sb_popline 80
+  sb_popline 80
+  sb_popline 80
+  sb_popline 80
+  ?screen_row 0  = "ABCDE"
+  ?screen_row 5  = "Line 1"
+  ?screen_row 29 = "Bottom"
+  ?cursor = 19,0
+WANTSCREEN -b
+
+!Resize can operate on altscreen
+RESET
+WANTSCREEN a
+RESIZE 25,80
+PUSH "Main screen\e[?1049h\e[HAlt screen"
+RESIZE 30,80
+  ?screen_row 0 = "Alt screen"
+PUSH "\e[?1049l"
+  ?screen_row 0 = "Main screen"
diff --git a/src/libvterm/t/64screen_pen.test b/src/libvterm/t/64screen_pen.test
new file mode 100644
index 0000000..1cb6324
--- /dev/null
+++ b/src/libvterm/t/64screen_pen.test
@@ -0,0 +1,61 @@
+INIT
+WANTSCREEN
+
+RESET
+
+!Plain
+PUSH "A"
+  ?screen_cell 0,0 = {0x41} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Bold
+PUSH "\e[1mB"
+  ?screen_cell 0,1 = {0x42} width=1 attrs={B} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Italic
+PUSH "\e[3mC"
+  ?screen_cell 0,2 = {0x43} width=1 attrs={BI} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Underline
+PUSH "\e[4mD"
+  ?screen_cell 0,3 = {0x44} width=1 attrs={BU1I} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Reset
+PUSH "\e[mE"
+  ?screen_cell 0,4 = {0x45} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Font
+PUSH "\e[11mF\e[m"
+  ?screen_cell 0,5 = {0x46} width=1 attrs={F1} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Foreground
+PUSH "\e[31mG\e[m"
+  ?screen_cell 0,6 = {0x47} width=1 attrs={} fg=idx(1) bg=rgb(0,0,0)
+
+!Background
+PUSH "\e[42mH\e[m"
+  ?screen_cell 0,7 = {0x48} width=1 attrs={} fg=rgb(240,240,240) bg=idx(2)
+
+!Super/subscript
+PUSH "x\e[74m0\e[73m2\e[m"
+  ?screen_cell 0,8  = {0x78} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+  ?screen_cell 0,9  = {0x30} width=1 attrs={S_} fg=rgb(240,240,240) bg=rgb(0,0,0)
+  ?screen_cell 0,10 = {0x32} width=1 attrs={S^} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!EL sets reverse and colours to end of line
+PUSH "\e[H\e[7;33;44m\e[K"
+  ?screen_cell 0,0  = {} width=1 attrs={R} fg=idx(3) bg=idx(4)
+  ?screen_cell 0,79 = {} width=1 attrs={R} fg=idx(3) bg=idx(4)
+
+!DECSCNM xors reverse for entire screen
+PUSH "\e[?5h"
+  ?screen_cell 0,0  = {} width=1 attrs={} fg=idx(3) bg=idx(4)
+  ?screen_cell 0,79 = {} width=1 attrs={} fg=idx(3) bg=idx(4)
+  ?screen_cell 1,0  = {} width=1 attrs={R} fg=rgb(240,240,240) bg=rgb(0,0,0)
+PUSH "\e[?5\$p"
+  output "\e[?5;1\$y"
+PUSH "\e[?5l"
+  ?screen_cell 0,0  = {} width=1 attrs={R} fg=idx(3) bg=idx(4)
+  ?screen_cell 0,79 = {} width=1 attrs={R} fg=idx(3) bg=idx(4)
+  ?screen_cell 1,0  = {} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+PUSH "\e[?5\$p"
+  output "\e[?5;2\$y"
diff --git a/src/libvterm/t/65screen_protect.test b/src/libvterm/t/65screen_protect.test
new file mode 100644
index 0000000..ec412a5
--- /dev/null
+++ b/src/libvterm/t/65screen_protect.test
@@ -0,0 +1,16 @@
+INIT
+WANTSCREEN 
+
+!Selective erase
+RESET
+PUSH "A\e[1\"qB\e[\"qC"
+  ?screen_row 0 = "ABC"
+PUSH "\e[G\e[?J"
+  ?screen_row 0 = " B"
+
+!Non-selective erase
+RESET
+PUSH "A\e[1\"qB\e[\"qC"
+  ?screen_row 0 = "ABC"
+PUSH "\e[G\e[J"
+  ?screen_row 0 = ""
diff --git a/src/libvterm/t/66screen_extent.test b/src/libvterm/t/66screen_extent.test
new file mode 100644
index 0000000..a126cec
--- /dev/null
+++ b/src/libvterm/t/66screen_extent.test
@@ -0,0 +1,11 @@
+INIT
+WANTSCREEN 
+
+!Bold extent
+RESET
+PUSH "AB\e[1mCD\e[mE"
+  ?screen_attrs_extent 0,0 = 0,0-1,1
+  ?screen_attrs_extent 0,1 = 0,0-1,1
+  ?screen_attrs_extent 0,2 = 0,2-1,3
+  ?screen_attrs_extent 0,3 = 0,2-1,3
+  ?screen_attrs_extent 0,4 = 0,4-1,79
diff --git a/src/libvterm/t/67screen_dbl_wh.test b/src/libvterm/t/67screen_dbl_wh.test
new file mode 100644
index 0000000..9c81e83
--- /dev/null
+++ b/src/libvterm/t/67screen_dbl_wh.test
@@ -0,0 +1,38 @@
+INIT
+WANTSCREEN
+
+RESET
+
+!Single Width, Single Height
+RESET
+PUSH "\e#5"
+PUSH "abcde"
+  ?screen_cell 0,0 = {0x61} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Double Width, Single Height
+RESET
+PUSH "\e#6"
+PUSH "abcde"
+  ?screen_cell 0,0 = {0x61} width=1 attrs={} dwl fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Double Height
+RESET
+PUSH "\e#3"
+PUSH "abcde"
+PUSH "\r\n\e#4"
+PUSH "abcde"
+  ?screen_cell 0,0 = {0x61} width=1 attrs={} dwl dhl-top fg=rgb(240,240,240) bg=rgb(0,0,0)
+  ?screen_cell 1,0 = {0x61} width=1 attrs={} dwl dhl-bottom fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!Late change
+RESET
+PUSH "abcde"
+  ?screen_cell 0,0 = {0x61} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
+PUSH "\e#6"
+  ?screen_cell 0,0 = {0x61} width=1 attrs={} dwl fg=rgb(240,240,240) bg=rgb(0,0,0)
+
+!DWL doesn't spill over on scroll
+RESET
+PUSH "\e[25H\e#6Final\r\n"
+  ?screen_cell 23,0 = {0x46} width=1 attrs={} dwl fg=rgb(240,240,240) bg=rgb(0,0,0)
+  ?screen_cell 24,0 = {} width=1 attrs={} fg=rgb(240,240,240) bg=rgb(0,0,0)
diff --git a/src/libvterm/t/68screen_termprops.test b/src/libvterm/t/68screen_termprops.test
new file mode 100644
index 0000000..bba6660
--- /dev/null
+++ b/src/libvterm/t/68screen_termprops.test
@@ -0,0 +1,17 @@
+INIT
+WANTSCREEN p
+
+RESET
+  settermprop 1 true
+  settermprop 2 true
+  settermprop 7 1
+
+!Cursor visibility
+PUSH "\e[?25h"
+  settermprop 1 true
+PUSH "\e[?25l"
+  settermprop 1 false
+
+!Title
+PUSH "\e]2;Here is my title\a"
+  settermprop 4 ["Here is my title"]
diff --git a/src/libvterm/t/69screen_reflow.test b/src/libvterm/t/69screen_reflow.test
new file mode 100644
index 0000000..278cc5b
--- /dev/null
+++ b/src/libvterm/t/69screen_reflow.test
@@ -0,0 +1,79 @@
+INIT
+# Run these tests on a much smaller default screen, so debug output is
+# nowhere near as noisy
+RESIZE 5,10
+WANTSTATE
+WANTSCREEN r
+RESET
+
+!Resize wider reflows wide lines
+RESET
+PUSH "A"x12
+  ?screen_row 0 = "AAAAAAAAAA"
+  ?screen_row 1 = "AA"
+  ?lineinfo 1 = cont
+  ?cursor = 1,2
+RESIZE 5,15
+  ?screen_row 0 = "AAAAAAAAAAAA"
+  ?screen_row 1 = 
+  ?lineinfo 1 =
+  ?cursor = 0,12
+RESIZE 5,20
+  ?screen_row 0 = "AAAAAAAAAAAA"
+  ?screen_row 1 = 
+  ?lineinfo 1 =
+  ?cursor = 0,12
+
+!Resize narrower can create continuation lines
+RESET
+RESIZE 5,10
+PUSH "ABCDEFGHI"
+  ?screen_row 0 = "ABCDEFGHI"
+  ?screen_row 1 = ""
+  ?lineinfo 1 =
+  ?cursor = 0,9
+RESIZE 5,8
+  ?screen_row 0 = "ABCDEFGH"
+  ?screen_row 1 = "I"
+  ?lineinfo 1 = cont
+  ?cursor = 1,1
+RESIZE 5,6
+  ?screen_row 0 = "ABCDEF"
+  ?screen_row 1 = "GHI"
+  ?lineinfo 1 = cont
+  ?cursor = 1,3
+
+!Shell wrapped prompt behaviour
+RESET
+RESIZE 5,10
+PUSH "PROMPT GOES HERE\r\n> \r\n\r\nPROMPT GOES HERE\r\n> "
+  ?screen_row 0 = "> "
+  ?screen_row 1 = ""
+  ?screen_row 2 = "PROMPT GOE"
+  ?screen_row 3 = "S HERE"
+  ?lineinfo 3 = cont
+  ?screen_row 4 = "> "
+  ?cursor = 4,2
+RESIZE 5,11
+  ?screen_row 0 = "> "
+  ?screen_row 1 = ""
+  ?screen_row 2 = "PROMPT GOES"
+  ?screen_row 3 = " HERE"
+  ?lineinfo 3 = cont
+  ?screen_row 4 = "> "
+  ?cursor = 4,2
+RESIZE 5,12
+  ?screen_row 0 = "> "
+  ?screen_row 1 = ""
+  ?screen_row 2 = "PROMPT GOES "
+  ?screen_row 3 = "HERE"
+  ?lineinfo 3 = cont
+  ?screen_row 4 = "> "
+  ?cursor = 4,2
+RESIZE 5,16
+  ?screen_row 0 = "> "
+  ?screen_row 1 = ""
+  ?screen_row 2 = "PROMPT GOES HERE"
+  ?lineinfo 3 =
+  ?screen_row 3 = "> "
+  ?cursor = 3,2
diff --git a/src/libvterm/t/90vttest_01-movement-1.test b/src/libvterm/t/90vttest_01-movement-1.test
new file mode 100644
index 0000000..c1a8cb9
--- /dev/null
+++ b/src/libvterm/t/90vttest_01-movement-1.test
@@ -0,0 +1,87 @@
+INIT
+WANTSTATE
+WANTSCREEN
+
+RESET
+
+PUSH "\e#8"
+
+PUSH "\e[9;10H\e[1J"
+PUSH "\e[18;60H\e[0J\e[1K"
+PUSH "\e[9;71H\e[0K"
+
+$SEQ 10 16: PUSH "\e[\#;10H\e[1K\e[\#;71H\e[0K"
+
+PUSH "\e[17;30H\e[2K"
+
+$SEQ 1 80: PUSH "\e[24;\#f*\e[1;\#f*"
+
+PUSH "\e[2;2H"
+
+$REP 22: PUSH "+\e[1D\eD"
+
+PUSH "\e[23;79H"
+$REP 22: PUSH "+\e[1D\eM"
+
+PUSH "\e[2;1H"
+$SEQ 2 23: PUSH "*\e[\#;80H*\e[10D\eE"
+
+PUSH "\e[2;10H\e[42D\e[2C"
+$REP 76: PUSH "+\e[0C\e[2D\e[1C"
+
+PUSH "\e[23;70H\e[42C\e[2D"
+
+$REP 76: PUSH "+\e[1D\e[1C\e[0D\b"
+
+PUSH "\e[1;1H"
+PUSH "\e[10A"
+PUSH "\e[1A"
+PUSH "\e[0A"
+PUSH "\e[24;80H"
+PUSH "\e[10B"
+PUSH "\e[1B"
+PUSH "\e[0B"
+PUSH "\e[10;12H"
+
+$REP 58: PUSH " "
+PUSH "\e[1B\e[58D"
+
+$REP 58: PUSH " "
+PUSH "\e[1B\e[58D"
+
+$REP 58: PUSH " "
+PUSH "\e[1B\e[58D"
+
+$REP 58: PUSH " "
+PUSH "\e[1B\e[58D"
+
+$REP 58: PUSH " "
+PUSH "\e[1B\e[58D"
+
+$REP 58: PUSH " "
+PUSH "\e[1B\e[58D"
+
+PUSH "\e[5A\e[1CThe screen should be cleared,  and have an unbroken bor-"
+PUSH "\e[12;13Hder of *'s and +'s around the edge,   and exactly in the"
+PUSH "\e[13;13Hmiddle  there should be a frame of E's around this  text"
+PUSH "\e[14;13Hwith  one (1) free position around it.    Push <RETURN>"
+
+# And the result is...
+
+!Output
+            ?screen_row  0 = "********************************************************************************"
+            ?screen_row  1 = "*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*"
+$SEQ  2  7: ?screen_row \# = "*+                                                                            +*"
+            ?screen_row  8 = "*+        EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE        +*"
+            ?screen_row  9 = "*+        E                                                          E        +*"
+            ?screen_row 10 = "*+        E The screen should be cleared,  and have an unbroken bor- E        +*"
+            ?screen_row 11 = "*+        E der of *'s and +'s around the edge,   and exactly in the E        +*"
+            ?screen_row 12 = "*+        E middle  there should be a frame of E's around this  text E        +*"
+            ?screen_row 13 = "*+        E with  one (1) free position around it.    Push <RETURN>  E        +*"
+            ?screen_row 14 = "*+        E                                                          E        +*"
+            ?screen_row 15 = "*+        EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE        +*"
+$SEQ 16 21: ?screen_row \# = "*+                                                                            +*"
+            ?screen_row 22 = "*++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++*"
+            ?screen_row 23 = "********************************************************************************"
+
+?cursor = 13,67
diff --git a/src/libvterm/t/90vttest_01-movement-2.test b/src/libvterm/t/90vttest_01-movement-2.test
new file mode 100644
index 0000000..3a515e3
--- /dev/null
+++ b/src/libvterm/t/90vttest_01-movement-2.test
@@ -0,0 +1,40 @@
+INIT
+WANTSTATE
+WANTSCREEN
+
+RESET
+
+PUSH "\e[3;21r"
+PUSH "\e[?6h"
+
+PUSH "\e[19;1HA\e[19;80Ha\x0a\e[18;80HaB\e[19;80HB\b b\x0a\e[19;80HC\b\b\t\tc\e[19;2H\bC\x0a\e[19;80H\x0a\e[18;1HD\e[18;80Hd"
+PUSH "\e[19;1HE\e[19;80He\x0a\e[18;80HeF\e[19;80HF\b f\x0a\e[19;80HG\b\b\t\tg\e[19;2H\bG\x0a\e[19;80H\x0a\e[18;1HH\e[18;80Hh"
+PUSH "\e[19;1HI\e[19;80Hi\x0a\e[18;80HiJ\e[19;80HJ\b j\x0a\e[19;80HK\b\b\t\tk\e[19;2H\bK\x0a\e[19;80H\x0a\e[18;1HL\e[18;80Hl"
+PUSH "\e[19;1HM\e[19;80Hm\x0a\e[18;80HmN\e[19;80HN\b n\x0a\e[19;80HO\b\b\t\to\e[19;2H\bO\x0a\e[19;80H\x0a\e[18;1HP\e[18;80Hp"
+PUSH "\e[19;1HQ\e[19;80Hq\x0a\e[18;80HqR\e[19;80HR\b r\x0a\e[19;80HS\b\b\t\ts\e[19;2H\bS\x0a\e[19;80H\x0a\e[18;1HT\e[18;80Ht"
+PUSH "\e[19;1HU\e[19;80Hu\x0a\e[18;80HuV\e[19;80HV\b v\x0a\e[19;80HW\b\b\t\tw\e[19;2H\bW\x0a\e[19;80H\x0a\e[18;1HX\e[18;80Hx"
+PUSH "\e[19;1HY\e[19;80Hy\x0a\e[18;80HyZ\e[19;80HZ\b z\x0a"
+
+!Output
+
+?screen_row  2 = "I                                                                              i"
+?screen_row  3 = "J                                                                              j"
+?screen_row  4 = "K                                                                              k"
+?screen_row  5 = "L                                                                              l"
+?screen_row  6 = "M                                                                              m"
+?screen_row  7 = "N                                                                              n"
+?screen_row  8 = "O                                                                              o"
+?screen_row  9 = "P                                                                              p"
+?screen_row 10 = "Q                                                                              q"
+?screen_row 11 = "R                                                                              r"
+?screen_row 12 = "S                                                                              s"
+?screen_row 13 = "T                                                                              t"
+?screen_row 14 = "U                                                                              u"
+?screen_row 15 = "V                                                                              v"
+?screen_row 16 = "W                                                                              w"
+?screen_row 17 = "X                                                                              x"
+?screen_row 18 = "Y                                                                              y"
+?screen_row 19 = "Z                                                                              z"
+?screen_row 20 = ""
+
+?cursor = 20,79
diff --git a/src/libvterm/t/90vttest_01-movement-3.test b/src/libvterm/t/90vttest_01-movement-3.test
new file mode 100644
index 0000000..f9a99bf
--- /dev/null
+++ b/src/libvterm/t/90vttest_01-movement-3.test
@@ -0,0 +1,21 @@
+# Test of cursor-control characters inside ESC sequences
+INIT
+WANTSTATE
+WANTSCREEN
+
+RESET
+
+PUSH "A B C D E F G H I"
+PUSH "\x0d\x0a"
+PUSH "A\e[2\bCB\e[2\bCC\e[2\bCD\e[2\bCE\e[2\bCF\e[2\bCG\e[2\bCH\e[2\bCI"
+PUSH "\x0d\x0a"
+PUSH "A \e[\x0d2CB\e[\x0d4CC\e[\x0d6CD\e[\x0d8CE\e[\x0d10CF\e[\x0d12CG\e[\x0d14CH\e[\x0d16CI"
+PUSH "\x0d\x0a"
+PUSH "A \e[1\x0bAB \e[1\x0bAC \e[1\x0bAD \e[1\x0bAE \e[1\x0bAF \e[1\x0bAG \e[1\x0bAH \e[1\x0bAI \e[1\x0bA"
+
+!Output
+
+$SEQ 0 2: ?screen_row \# = "A B C D E F G H I"
+          ?screen_row  3 = "A B C D E F G H I "
+
+?cursor = 3,18
diff --git a/src/libvterm/t/90vttest_01-movement-4.test b/src/libvterm/t/90vttest_01-movement-4.test
new file mode 100644
index 0000000..0dab3c7
--- /dev/null
+++ b/src/libvterm/t/90vttest_01-movement-4.test
@@ -0,0 +1,36 @@
+# Test of leading zeroes in ESC sequences
+INIT
+WANTSCREEN
+
+RESET
+
+PUSH "\e[00000000004;000000001HT"
+PUSH "\e[00000000004;000000002Hh"
+PUSH "\e[00000000004;000000003Hi"
+PUSH "\e[00000000004;000000004Hs"
+PUSH "\e[00000000004;000000005H "
+PUSH "\e[00000000004;000000006Hi"
+PUSH "\e[00000000004;000000007Hs"
+PUSH "\e[00000000004;000000008H "
+PUSH "\e[00000000004;000000009Ha"
+PUSH "\e[00000000004;0000000010H "
+PUSH "\e[00000000004;0000000011Hc"
+PUSH "\e[00000000004;0000000012Ho"
+PUSH "\e[00000000004;0000000013Hr"
+PUSH "\e[00000000004;0000000014Hr"
+PUSH "\e[00000000004;0000000015He"
+PUSH "\e[00000000004;0000000016Hc"
+PUSH "\e[00000000004;0000000017Ht"
+PUSH "\e[00000000004;0000000018H "
+PUSH "\e[00000000004;0000000019Hs"
+PUSH "\e[00000000004;0000000020He"
+PUSH "\e[00000000004;0000000021Hn"
+PUSH "\e[00000000004;0000000022Ht"
+PUSH "\e[00000000004;0000000023He"
+PUSH "\e[00000000004;0000000024Hn"
+PUSH "\e[00000000004;0000000025Hc"
+PUSH "\e[00000000004;0000000026He"
+
+!Output
+
+?screen_row 3 = "This is a correct sentence"
diff --git a/src/libvterm/t/90vttest_02-screen-1.test b/src/libvterm/t/90vttest_02-screen-1.test
new file mode 100644
index 0000000..003d56f
--- /dev/null
+++ b/src/libvterm/t/90vttest_02-screen-1.test
@@ -0,0 +1,18 @@
+# Test of WRAP AROUND mode setting.
+INIT
+WANTSCREEN
+
+RESET
+
+PUSH "\e[?7h"
+$REP 170: PUSH "*"
+
+PUSH "\e[?7l\e[3;1H"
+$REP 177: PUSH "*"
+
+PUSH "\e[?7h\e[5;1HOK"
+
+!Output
+$SEQ 0 2: ?screen_row \# = "********************************************************************************"
+          ?screen_row  3 = ""
+          ?screen_row  4 = "OK"
diff --git a/src/libvterm/t/90vttest_02-screen-2.test b/src/libvterm/t/90vttest_02-screen-2.test
new file mode 100644
index 0000000..1c3a6a7
--- /dev/null
+++ b/src/libvterm/t/90vttest_02-screen-2.test
@@ -0,0 +1,29 @@
+# TAB setting/resetting
+INIT
+WANTSTATE
+WANTSCREEN
+
+RESET
+
+PUSH "\e[2J\e[3g"
+
+PUSH "\e[1;1H"
+$REP 26: PUSH "\e[3C\eH"
+
+PUSH "\e[1;4H"
+$REP 13: PUSH "\e[0g\e[6C"
+
+PUSH "\e[1;7H"
+PUSH "\e[1g\e[2g"
+
+PUSH "\e[1;1H"
+$REP 13: PUSH "\t*"
+
+PUSH "\e[2;2H"
+$REP 13: PUSH "     *"
+
+!Output
+?screen_row 0 = "      *     *     *     *     *     *     *     *     *     *     *     *     *"
+?screen_row 1 = "      *     *     *     *     *     *     *     *     *     *     *     *     *"
+
+?cursor = 1,79
diff --git a/src/libvterm/t/90vttest_02-screen-3.test b/src/libvterm/t/90vttest_02-screen-3.test
new file mode 100644
index 0000000..8cdf8df
--- /dev/null
+++ b/src/libvterm/t/90vttest_02-screen-3.test
@@ -0,0 +1,16 @@
+# Origin mode
+INIT
+WANTSCREEN
+
+RESET
+
+PUSH "\e[?6h"
+PUSH "\e[23;24r"
+PUSH "\n"
+PUSH "Bottom"
+PUSH "\e[1;1H"
+PUSH "Above"
+
+!Output
+?screen_row 22 = "Above"
+?screen_row 23 = "Bottom"
diff --git a/src/libvterm/t/90vttest_02-screen-4.test b/src/libvterm/t/90vttest_02-screen-4.test
new file mode 100644
index 0000000..44d51f1
--- /dev/null
+++ b/src/libvterm/t/90vttest_02-screen-4.test
@@ -0,0 +1,17 @@
+# Origin mode (2)
+INIT
+WANTSCREEN
+
+RESET
+
+PUSH "\e[?6l"
+PUSH "\e[23;24r"
+PUSH "\e[24;1H"
+PUSH "Bottom"
+PUSH "\e[1;1H"
+PUSH "Top"
+
+!Output
+?screen_row 23 = "Bottom"
+?screen_row 0  = "Top"
+
diff --git a/src/libvterm/t/92lp1640917.test b/src/libvterm/t/92lp1640917.test
new file mode 100644
index 0000000..70de439
--- /dev/null
+++ b/src/libvterm/t/92lp1640917.test
@@ -0,0 +1,13 @@
+INIT
+WANTSTATE 
+
+!Mouse reporting should not break by idempotent DECSM 1002
+PUSH "\e[?1002h"
+MOUSEMOVE 0,0 0
+MOUSEBTN d 1 0
+  output "\e[M\x20\x21\x21"
+MOUSEMOVE 1,0 0
+  output "\e[M\x40\x21\x22"
+PUSH "\e[?1002h"
+MOUSEMOVE 2,0 0
+  output "\e[M\x40\x21\x23"
diff --git a/src/libvterm/t/harness.c b/src/libvterm/t/harness.c
new file mode 100644
index 0000000..d12c120
--- /dev/null
+++ b/src/libvterm/t/harness.c
@@ -0,0 +1,1233 @@
+#include "vterm.h"
+#include "../src/vterm_internal.h" // We pull in some internal bits too
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#define streq(a,b) (!strcmp(a,b))
+#define strstartswith(a,b) (!strncmp(a,b,strlen(b)))
+
+static size_t inplace_hex2bytes(char *s)
+{
+  char *inpos = s, *outpos = s;
+
+  while(*inpos) {
+    unsigned int ch;
+    if(sscanf(inpos, "%2x", &ch) < 1)
+      break;
+    *outpos = ch;
+    outpos += 1; inpos += 2;
+  }
+
+  return outpos - s;
+}
+
+static VTermModifier strpe_modifiers(char **strp)
+{
+  VTermModifier state = 0;
+
+  while((*strp)[0]) {
+    switch(((*strp)++)[0]) {
+      case 'S': state |= VTERM_MOD_SHIFT; break;
+      case 'C': state |= VTERM_MOD_CTRL;  break;
+      case 'A': state |= VTERM_MOD_ALT;   break;
+      default: return state;
+    }
+  }
+
+  return state;
+}
+
+static VTermKey strp_key(char *str)
+{
+  static struct {
+    char *name;
+    VTermKey key;
+  } keys[] = {
+    { "Up",    VTERM_KEY_UP },
+    { "Tab",   VTERM_KEY_TAB },
+    { "Enter", VTERM_KEY_ENTER },
+    { "KP0",   VTERM_KEY_KP_0 },
+    { "F1",    VTERM_KEY_FUNCTION(1) },
+    { NULL,    VTERM_KEY_NONE },
+  };
+  int i;
+
+  for(i = 0; keys[i].name; i++) {
+    if(streq(str, keys[i].name))
+      return keys[i].key;
+  }
+
+  return VTERM_KEY_NONE;
+}
+
+static void print_color(const VTermColor *col)
+{
+  if (VTERM_COLOR_IS_RGB(col)) {
+    printf("rgb(%d,%d,%d", col->red, col->green, col->blue);
+  }
+  else if (VTERM_COLOR_IS_INDEXED(col)) {
+    printf("idx(%d", col->index);
+  }
+  else {
+    printf("invalid(%d", col->type);
+  }
+  if (VTERM_COLOR_IS_DEFAULT_FG(col)) {
+    printf(",is_default_fg");
+  }
+  if (VTERM_COLOR_IS_DEFAULT_BG(col)) {
+    printf(",is_default_bg");
+  }
+  printf(")");
+}
+
+static VTerm *vt;
+static VTermState *state;
+static VTermScreen *screen;
+
+static VTermEncodingInstance encoding;
+
+static void term_output(const char *s, size_t len, void *user UNUSED)
+{
+  size_t i;
+
+  printf("output ");
+  for(i = 0; i < len; i++)
+    printf("%x%s", (unsigned char)s[i], i < len-1 ? "," : "\n");
+}
+
+static void printhex(const char *s, size_t len)
+{
+  while(len--)
+    printf("%02x", (uint8_t)(s++)[0]);
+}
+
+static int parser_text(const char bytes[], size_t len, void *user UNUSED)
+{
+  size_t i;
+
+  printf("text ");
+  for(i = 0; i < len; i++) {
+    unsigned char b = bytes[i];
+    if(b < 0x20 || b == 0x7f || (b >= 0x80 && b < 0xa0))
+      break;
+    printf(i ? ",%x" : "%x", b);
+  }
+  printf("\n");
+
+  return i;
+}
+
+static int parser_control(unsigned char control, void *user UNUSED)
+{
+  printf("control %02x\n", control);
+
+  return 1;
+}
+
+static int parser_escape(const char bytes[], size_t len, void *user UNUSED)
+{
+  if(bytes[0] >= 0x20 && bytes[0] < 0x30) {
+    if(len < 2)
+      return -1;
+    len = 2;
+  }
+  else {
+    len = 1;
+  }
+
+  printf("escape ");
+  printhex(bytes, len);
+  printf("\n");
+
+  return len;
+}
+
+static int parser_csi(const char *leader, const long args[], int argcount, const char *intermed, char command, void *user UNUSED)
+{
+  int i;
+  printf("csi %02x", command);
+
+  if(leader && leader[0]) {
+    printf(" L=");
+    for(i = 0; leader[i]; i++)
+      printf("%02x", leader[i]);
+  }
+
+  for(i = 0; i < argcount; i++) {
+    char sep = i ? ',' : ' ';
+
+    if(args[i] == CSI_ARG_MISSING)
+      printf("%c*", sep);
+    else
+      printf("%c%ld%s", sep, CSI_ARG(args[i]), CSI_ARG_HAS_MORE(args[i]) ? "+" : "");
+  }
+
+  if(intermed && intermed[0]) {
+    printf(" I=");
+    for(i = 0; intermed[i]; i++)
+      printf("%02x", intermed[i]);
+  }
+
+  printf("\n");
+
+  return 1;
+}
+
+static int parser_osc(int command, VTermStringFragment frag, void *user UNUSED)
+{
+
+  printf("osc ");
+
+  if(frag.initial) {
+    if(command == -1)
+      printf("[");
+    else
+      printf("[%d;", command);
+  }
+
+  printhex(frag.str, frag.len);
+
+  if(frag.final)
+    printf("]");
+
+  printf("\n");
+
+  return 1;
+}
+
+static int parser_dcs(const char *command, size_t commandlen, VTermStringFragment frag, void *user UNUSED)
+{
+  printf("dcs ");
+
+  if(frag.initial) {
+    size_t i;
+    printf("[");
+    for(i = 0; i < commandlen; i++)
+      printf("%02x", command[i]);
+  }
+
+  printhex(frag.str, frag.len);
+
+  if(frag.final)
+    printf("]");
+
+  printf("\n");
+
+  return 1;
+}
+
+static int parser_apc(VTermStringFragment frag, void *user UNUSED)
+{
+  printf("apc ");
+
+  if(frag.initial)
+    printf("[");
+
+  printhex(frag.str, frag.len);
+
+  if(frag.final)
+    printf("]");
+
+  printf("\n");
+
+  return 1;
+}
+
+static int parser_pm(VTermStringFragment frag, void *user UNUSED)
+{
+  printf("pm ");
+
+  if(frag.initial)
+    printf("[");
+
+  printhex(frag.str, frag.len);
+
+  if(frag.final)
+    printf("]");
+
+  printf("\n");
+
+  return 1;
+}
+
+static int parser_sos(VTermStringFragment frag, void *user UNUSED)
+{
+  printf("sos ");
+
+  if(frag.initial)
+    printf("[");
+
+  printhex(frag.str, frag.len);
+
+  if(frag.final)
+    printf("]");
+
+  printf("\n");
+
+  return 1;
+}
+
+static VTermParserCallbacks parser_cbs = {
+  parser_text, // text
+  parser_control, // control
+  parser_escape, // escape
+  parser_csi, // csi
+  parser_osc, // osc
+  parser_dcs, // dcs
+  parser_apc, // apc
+  parser_pm, // pm
+  parser_sos, // sos
+  NULL // resize
+};
+
+static VTermStateFallbacks fallbacks = {
+  parser_control, // control
+  parser_csi, // csi
+  parser_osc, // osc
+  parser_dcs, // dcs
+  parser_apc, // dcs
+  parser_pm, // pm
+  parser_sos // sos
+};
+
+/* These callbacks are shared by State and Screen */
+
+static int want_movecursor = 0;
+static VTermPos state_pos;
+static int movecursor(VTermPos pos, VTermPos oldpos UNUSED, int visible UNUSED, void *user UNUSED)
+{
+  state_pos = pos;
+
+  if(want_movecursor)
+    printf("movecursor %d,%d\n", pos.row, pos.col);
+
+  return 1;
+}
+
+static int want_scrollrect = 0;
+static int scrollrect(VTermRect rect, int downward, int rightward, void *user UNUSED)
+{
+  if(!want_scrollrect)
+    return 0;
+
+  printf("scrollrect %d..%d,%d..%d => %+d,%+d\n",
+      rect.start_row, rect.end_row, rect.start_col, rect.end_col,
+      downward, rightward);
+
+  return 1;
+}
+
+static int want_moverect = 0;
+static int moverect(VTermRect dest, VTermRect src, void *user UNUSED)
+{
+  if(!want_moverect)
+    return 0;
+
+  printf("moverect %d..%d,%d..%d -> %d..%d,%d..%d\n",
+      src.start_row,  src.end_row,  src.start_col,  src.end_col,
+      dest.start_row, dest.end_row, dest.start_col, dest.end_col);
+
+  return 1;
+}
+
+static int want_settermprop = 0;
+static int settermprop(VTermProp prop, VTermValue *val, void *user UNUSED)
+{
+  VTermValueType type;
+  if(!want_settermprop)
+    return 1;
+
+  type = vterm_get_prop_type(prop);
+  switch(type) {
+  case VTERM_VALUETYPE_BOOL:
+    printf("settermprop %d %s\n", prop, val->boolean ? "true" : "false");
+    return 1;
+  case VTERM_VALUETYPE_INT:
+    printf("settermprop %d %d\n", prop, val->number);
+    return 1;
+  case VTERM_VALUETYPE_STRING:
+    printf("settermprop %d %s\"%.*s\"%s\n", prop,
+        val->string.initial ? "[" : "", val->string.len, val->string.str, val->string.final ? "]" : "");
+    return 1;
+  case VTERM_VALUETYPE_COLOR:
+    printf("settermprop %d ", prop);
+    print_color(&val->color);
+    printf("\n");
+    return 1;
+
+  case VTERM_N_VALUETYPES:
+    return 0;
+  }
+
+  return 0;
+}
+
+// These callbacks are for State
+
+static int want_state_putglyph = 0;
+static int state_putglyph(VTermGlyphInfo *info, VTermPos pos, void *user UNUSED)
+{
+  int i;
+  if(!want_state_putglyph)
+    return 1;
+
+  printf("putglyph ");
+  for(i = 0; i < VTERM_MAX_CHARS_PER_CELL && info->chars[i]; i++)
+    printf(i ? ",%x" : "%x", info->chars[i]);
+  printf(" %d %d,%d", info->width, pos.row, pos.col);
+  if(info->protected_cell)
+    printf(" prot");
+  if(info->dwl)
+    printf(" dwl");
+  if(info->dhl)
+    printf(" dhl-%s", info->dhl == 1 ? "top" : info->dhl == 2 ? "bottom" : "?" );
+  printf("\n");
+
+  return 1;
+}
+
+static int want_state_erase = 0;
+static int state_erase(VTermRect rect, int selective, void *user UNUSED)
+{
+  if(!want_state_erase)
+    return 1;
+
+  printf("erase %d..%d,%d..%d%s\n",
+      rect.start_row, rect.end_row, rect.start_col, rect.end_col,
+      selective ? " selective" : "");
+
+  return 1;
+}
+
+static struct {
+  int bold;
+  int underline;
+  int italic;
+  int blink;
+  int reverse;
+  int conceal;
+  int strike;
+  int font;
+  int small;
+  int baseline;
+  VTermColor foreground;
+  VTermColor background;
+} state_pen;
+static int state_setpenattr(VTermAttr attr, VTermValue *val, void *user UNUSED)
+{
+  switch(attr) {
+  case VTERM_ATTR_BOLD:
+    state_pen.bold = val->boolean;
+    break;
+  case VTERM_ATTR_UNDERLINE:
+    state_pen.underline = val->number;
+    break;
+  case VTERM_ATTR_ITALIC:
+    state_pen.italic = val->boolean;
+    break;
+  case VTERM_ATTR_BLINK:
+    state_pen.blink = val->boolean;
+    break;
+  case VTERM_ATTR_REVERSE:
+    state_pen.reverse = val->boolean;
+    break;
+  case VTERM_ATTR_CONCEAL:
+    state_pen.conceal = val->boolean;
+    break;
+  case VTERM_ATTR_STRIKE:
+    state_pen.strike = val->boolean;
+    break;
+  case VTERM_ATTR_FONT:
+    state_pen.font = val->number;
+    break;
+  case VTERM_ATTR_SMALL:
+    state_pen.small = val->boolean;
+    break;
+  case VTERM_ATTR_BASELINE:
+    state_pen.baseline = val->number;
+    break;
+  case VTERM_ATTR_FOREGROUND:
+    state_pen.foreground = val->color;
+    break;
+  case VTERM_ATTR_BACKGROUND:
+    state_pen.background = val->color;
+    break;
+
+  case VTERM_N_ATTRS:
+    return 0;
+  }
+
+  return 1;
+}
+
+static int state_setlineinfo(int row UNUSED, const VTermLineInfo *newinfo UNUSED, const VTermLineInfo *oldinfo UNUSED, void *user UNUSED)
+{
+  return 1;
+}
+
+static int want_state_scrollback = 0;
+static int state_sb_clear(void *user UNUSED) {
+  if(!want_state_scrollback)
+    return 1;
+
+  printf("sb_clear\n");
+  return 0;
+}
+
+VTermStateCallbacks state_cbs = {
+  state_putglyph, // putglyph
+  movecursor, // movecursor
+  scrollrect, // scrollrect
+  moverect, // moverect
+  state_erase, // erase
+  NULL, // initpen
+  state_setpenattr, // setpenattr
+  settermprop, // settermprop
+  NULL, // bell
+  NULL, // resize
+  state_setlineinfo, // setlineinfo
+  state_sb_clear, // sb_clear
+};
+
+static int selection_set(VTermSelectionMask mask, VTermStringFragment frag, void *user UNUSED)
+{
+  printf("selection-set mask=%04X ", mask);
+  if(frag.initial)
+    printf("[");
+  printhex(frag.str, frag.len);
+  if(frag.final)
+    printf("]");
+  printf("\n");
+
+  return 1;
+}
+
+static int selection_query(VTermSelectionMask mask, void *user UNUSED)
+{
+  printf("selection-query mask=%04X\n", mask);
+
+  return 1;
+}
+
+VTermSelectionCallbacks selection_cbs = {
+  .set   = selection_set,
+  .query = selection_query,
+};
+
+static int want_screen_damage = 0;
+static int want_screen_damage_cells = 0;
+static int screen_damage(VTermRect rect, void *user UNUSED)
+{
+  if(!want_screen_damage)
+    return 1;
+
+  printf("damage %d..%d,%d..%d",
+      rect.start_row, rect.end_row, rect.start_col, rect.end_col);
+
+  if(want_screen_damage_cells) {
+    int equals = FALSE;
+    int row;
+    int col;
+
+    for(row = rect.start_row; row < rect.end_row; row++) {
+      int eol = rect.end_col;
+      while(eol > rect.start_col) {
+        VTermScreenCell cell;
+	VTermPos pos;
+	pos.row = row;
+	pos.col = eol-1;
+        vterm_screen_get_cell(screen, pos, &cell);
+        if(cell.chars[0])
+          break;
+
+        eol--;
+      }
+
+      if(eol == rect.start_col)
+        break;
+
+      if(!equals)
+        printf(" ="), equals = TRUE;
+
+      printf(" %d<", row);
+      for(col = rect.start_col; col < eol; col++) {
+        VTermScreenCell cell;
+	VTermPos pos;
+	pos.row = row;
+	pos.col = col;
+        vterm_screen_get_cell(screen, pos, &cell);
+        printf(col == rect.start_col ? "%02X" : " %02X", cell.chars[0]);
+      }
+      printf(">");
+    }
+  }
+
+  printf("\n");
+
+  return 1;
+}
+
+static int want_screen_scrollback = 0;
+static int screen_sb_pushline(int cols, const VTermScreenCell *cells, void *user UNUSED)
+{
+  int eol;
+  int c;
+
+  if(!want_screen_scrollback)
+    return 1;
+
+  eol = cols;
+  while(eol && !cells[eol-1].chars[0])
+    eol--;
+
+  printf("sb_pushline %d =", cols);
+  for(c = 0; c < eol; c++)
+    printf(" %02X", cells[c].chars[0]);
+  printf("\n");
+
+  return 1;
+}
+
+static int screen_sb_popline(int cols, VTermScreenCell *cells, void *user UNUSED)
+{
+  int col;
+
+  if(!want_screen_scrollback)
+    return 0;
+
+  // All lines of scrollback contain "ABCDE"
+  for(col = 0; col < cols; col++) {
+    if(col < 5)
+      cells[col].chars[0] = 'A' + col;
+    else
+      cells[col].chars[0] = 0;
+
+    cells[col].width = 1;
+  }
+
+  printf("sb_popline %d\n", cols);
+  return 1;
+}
+
+static int screen_sb_clear(void *user UNUSED)
+{
+  if(!want_screen_scrollback)
+    return 1;
+
+  printf("sb_clear\n");
+  return 0;
+}
+
+VTermScreenCallbacks screen_cbs = {
+  screen_damage, // damage
+  moverect, // moverect
+  movecursor, // movecursor
+  settermprop, // settermprop
+  NULL, // bell
+  NULL, // resize
+  screen_sb_pushline, // sb_pushline
+  screen_sb_popline, // sb_popline
+  screen_sb_clear, // sb_clear
+};
+
+int main(int argc UNUSED, char **argv UNUSED)
+{
+  char line[1024] = {0};
+  int flag;
+
+  int err;
+
+  setvbuf(stdout, NULL, _IONBF, 0);
+
+  while(fgets(line, sizeof line, stdin)) {
+    char *nl;
+    size_t outlen;
+    err = 0;
+
+    if((nl = strchr(line, '\n')))
+      *nl = '\0';
+
+    if(streq(line, "INIT")) {
+      if(!vt)
+        vt = vterm_new(25, 80);
+
+      // Somehow this makes tests fail
+      // vterm_output_set_callback(vt, term_output, NULL);
+    }
+
+    else if(streq(line, "WANTPARSER")) {
+      assert(vt);
+      vterm_parser_set_callbacks(vt, &parser_cbs, NULL);
+    }
+
+    else if(strstartswith(line, "WANTSTATE") && (line[9] == '\0' || line[9] == ' ')) {
+      int i = 9;
+      int sense = 1;
+      assert(vt);
+      if(!state) {
+        state = vterm_obtain_state(vt);
+        vterm_state_set_callbacks(state, &state_cbs, NULL);
+        vterm_state_set_selection_callbacks(state, &selection_cbs, NULL, NULL, 1024);
+        vterm_state_set_bold_highbright(state, 1);
+        vterm_state_reset(state, 1);
+      }
+
+      while(line[i] == ' ')
+        i++;
+      for( ; line[i]; i++)
+        switch(line[i]) {
+        case '+':
+          sense = 1;
+          break;
+        case '-':
+          sense = 0;
+          break;
+        case 'g':
+          want_state_putglyph = sense;
+          break;
+        case 's':
+          want_scrollrect = sense;
+          break;
+        case 'm':
+          want_moverect = sense;
+          break;
+        case 'e':
+          want_state_erase = sense;
+          break;
+        case 'p':
+          want_settermprop = sense;
+          break;
+        case 'f':
+          vterm_state_set_unrecognised_fallbacks(state, sense ? &fallbacks : NULL, NULL);
+          break;
+        case 'b':
+          want_state_scrollback = sense;
+          break;
+        default:
+          fprintf(stderr, "Unrecognised WANTSTATE flag '%c'\n", line[i]);
+        }
+    }
+
+    else if(strstartswith(line, "WANTSCREEN") && (line[10] == '\0' || line[10] == ' ')) {
+      int i = 10;
+      int sense = 1;
+      assert(vt);
+      if(!screen)
+        screen = vterm_obtain_screen(vt);
+      vterm_screen_set_callbacks(screen, &screen_cbs, NULL);
+
+      while(line[i] == ' ')
+        i++;
+      for( ; line[i]; i++)
+        switch(line[i]) {
+        case '-':
+          sense = 0;
+          break;
+        case 'a':
+          vterm_screen_enable_altscreen(screen, 1);
+          break;
+        case 'd':
+          want_screen_damage = sense;
+          break;
+        case 'D':
+          want_screen_damage = sense;
+          want_screen_damage_cells = sense;
+          break;
+        case 'm':
+          want_moverect = sense;
+          break;
+        case 'c':
+          want_movecursor = sense;
+          break;
+        case 'p':
+          want_settermprop = 1;
+          break;
+        case 'b':
+          want_screen_scrollback = sense;
+          break;
+        case 'r':
+          vterm_screen_enable_reflow(screen, sense);
+          break;
+        default:
+          fprintf(stderr, "Unrecognised WANTSCREEN flag '%c'\n", line[i]);
+        }
+    }
+
+    else if(sscanf(line, "UTF8 %d", &flag)) {
+      vterm_set_utf8(vt, flag);
+    }
+
+    else if(streq(line, "RESET")) {
+      if(state) {
+        vterm_state_reset(state, 1);
+        vterm_state_get_cursorpos(state, &state_pos);
+      }
+      if(screen) {
+        vterm_screen_reset(screen, 1);
+      }
+    }
+
+    else if(strstartswith(line, "RESIZE ")) {
+      int rows, cols;
+      char *linep = line + 7;
+      while(linep[0] == ' ')
+        linep++;
+      sscanf(linep, "%d, %d", &rows, &cols);
+      vterm_set_size(vt, rows, cols);
+    }
+
+    else if(strstartswith(line, "PUSH ")) {
+      char *bytes = line + 5;
+      size_t len = inplace_hex2bytes(bytes);
+      assert(len);
+
+      size_t written = vterm_input_write(vt, bytes, len);
+      if(written < len)
+        fprintf(stderr, "! short write\n");
+    }
+
+    else if(streq(line, "WANTENCODING")) {
+      // This isn't really external API but it's hard to get this out any
+      // other way
+      encoding.enc = vterm_lookup_encoding(ENC_UTF8, 'u');
+      if(encoding.enc->init)
+        (*encoding.enc->init)(encoding.enc, encoding.data);
+    }
+
+    else if(strstartswith(line, "ENCIN ")) {
+      char *bytes = line + 6;
+      size_t len = inplace_hex2bytes(bytes);
+      assert(len);
+
+      uint32_t cp[1024];
+      int cpi = 0;
+      size_t pos = 0;
+
+      (*encoding.enc->decode)(encoding.enc, encoding.data,
+          cp, &cpi, len, bytes, &pos, len);
+
+      if(cpi > 0) {
+	int i;
+        printf("encout ");
+        for(i = 0; i < cpi; i++) {
+          printf(i ? ",%x" : "%x", cp[i]);
+        }
+        printf("\n");
+      }
+    }
+
+    else if(strstartswith(line, "INCHAR ")) {
+      char *linep = line + 7;
+      unsigned int c = 0;
+      VTermModifier mod;
+      while(linep[0] == ' ')
+        linep++;
+      mod = strpe_modifiers(&linep);
+      sscanf(linep, " %x", &c);
+
+      vterm_keyboard_unichar(vt, c, mod);
+    }
+
+    else if(strstartswith(line, "INKEY ")) {
+      VTermModifier mod;
+      VTermKey key;
+      char *linep = line + 6;
+      while(linep[0] == ' ')
+        linep++;
+      mod = strpe_modifiers(&linep);
+      while(linep[0] == ' ')
+        linep++;
+      key = strp_key(linep);
+
+      vterm_keyboard_key(vt, key, mod);
+    }
+
+    else if(strstartswith(line, "PASTE ")) {
+      char *linep = line + 6;
+      if(streq(linep, "START"))
+        vterm_keyboard_start_paste(vt);
+      else if(streq(linep, "END"))
+        vterm_keyboard_end_paste(vt);
+      else
+        goto abort_line;
+    }
+
+    else if(strstartswith(line, "FOCUS ")) {
+      assert(state);
+      char *linep = line + 6;
+      if(streq(linep, "IN"))
+        vterm_state_focus_in(state);
+      else if(streq(linep, "OUT"))
+        vterm_state_focus_out(state);
+      else
+        goto abort_line;
+    }
+
+    else if(strstartswith(line, "MOUSEMOVE ")) {
+      char *linep = line + 10;
+      int row, col, len;
+      VTermModifier mod;
+      while(linep[0] == ' ')
+        linep++;
+      sscanf(linep, "%d,%d%n", &row, &col, &len);
+      linep += len;
+      while(linep[0] == ' ')
+        linep++;
+      mod = strpe_modifiers(&linep);
+      vterm_mouse_move(vt, row, col, mod);
+    }
+
+    else if(strstartswith(line, "MOUSEBTN ")) {
+      char *linep = line + 9;
+      char press;
+      int button, len;
+      VTermModifier mod;
+      while(linep[0] == ' ')
+        linep++;
+      sscanf(linep, "%c %d%n", &press, &button, &len);
+      linep += len;
+      while(linep[0] == ' ')
+        linep++;
+      mod = strpe_modifiers(&linep);
+      vterm_mouse_button(vt, button, (press == 'd' || press == 'D'), mod);
+    }
+
+    else if(strstartswith(line, "SELECTION ")) {
+      char *linep = line + 10;
+      unsigned int mask;
+      int len;
+      VTermStringFragment frag = { 0 };
+      sscanf(linep, "%x%n", &mask, &len);
+      linep += len;
+      while(linep[0] == ' ')
+        linep++;
+      if(linep[0] == '[') {
+        frag.initial = TRUE;
+        linep++;
+        while(linep[0] == ' ')
+          linep++;
+      }
+      frag.len = inplace_hex2bytes(linep);
+      frag.str = linep;
+      assert(frag.len);
+
+      linep += frag.len * 2;
+      while(linep[0] == ' ')
+        linep++;
+      if(linep[0] == ']') {
+        frag.final = TRUE;
+      }
+      vterm_state_send_selection(state, mask, frag);
+    }
+
+    else if(strstartswith(line, "DAMAGEMERGE ")) {
+      assert(screen);
+      char *linep = line + 12;
+      while(linep[0] == ' ')
+        linep++;
+      if(streq(linep, "CELL"))
+        vterm_screen_set_damage_merge(screen, VTERM_DAMAGE_CELL);
+      else if(streq(linep, "ROW"))
+        vterm_screen_set_damage_merge(screen, VTERM_DAMAGE_ROW);
+      else if(streq(linep, "SCREEN"))
+        vterm_screen_set_damage_merge(screen, VTERM_DAMAGE_SCREEN);
+      else if(streq(linep, "SCROLL"))
+        vterm_screen_set_damage_merge(screen, VTERM_DAMAGE_SCROLL);
+    }
+
+    else if(strstartswith(line, "DAMAGEFLUSH")) {
+      assert(screen);
+      vterm_screen_flush_damage(screen);
+    }
+
+    else if(line[0] == '?') {
+      if(streq(line, "?cursor")) {
+        assert(state);
+        VTermPos pos;
+        vterm_state_get_cursorpos(state, &pos);
+        if(pos.row != state_pos.row)
+          printf("! row mismatch: state=%d,%d event=%d,%d\n",
+              pos.row, pos.col, state_pos.row, state_pos.col);
+        else if(pos.col != state_pos.col)
+          printf("! col mismatch: state=%d,%d event=%d,%d\n",
+              pos.row, pos.col, state_pos.row, state_pos.col);
+        else
+          printf("%d,%d\n", state_pos.row, state_pos.col);
+      }
+      else if(strstartswith(line, "?pen ")) {
+        assert(state);
+        VTermValue val;
+        char *linep = line + 5;
+        while(linep[0] == ' ')
+          linep++;
+
+#define BOOLSTR(v) ((v) ? "on" : "off")
+
+        if(streq(linep, "bold")) {
+          vterm_state_get_penattr(state, VTERM_ATTR_BOLD, &val);
+          if(val.boolean != state_pen.bold)
+            printf("! pen bold mismatch; state=%s, event=%s\n",
+                BOOLSTR(val.boolean), BOOLSTR(state_pen.bold));
+          else
+            printf("%s\n", BOOLSTR(state_pen.bold));
+        }
+        else if(streq(linep, "underline")) {
+          vterm_state_get_penattr(state, VTERM_ATTR_UNDERLINE, &val);
+          if(val.boolean != state_pen.underline)
+            printf("! pen underline mismatch; state=%d, event=%d\n",
+                val.boolean, state_pen.underline);
+          else
+            printf("%d\n", state_pen.underline);
+        }
+        else if(streq(linep, "italic")) {
+          vterm_state_get_penattr(state, VTERM_ATTR_ITALIC, &val);
+          if(val.boolean != state_pen.italic)
+            printf("! pen italic mismatch; state=%s, event=%s\n",
+                BOOLSTR(val.boolean), BOOLSTR(state_pen.italic));
+          else
+            printf("%s\n", BOOLSTR(state_pen.italic));
+        }
+        else if(streq(linep, "blink")) {
+          vterm_state_get_penattr(state, VTERM_ATTR_BLINK, &val);
+          if(val.boolean != state_pen.blink)
+            printf("! pen blink mismatch; state=%s, event=%s\n",
+                BOOLSTR(val.boolean), BOOLSTR(state_pen.blink));
+          else
+            printf("%s\n", BOOLSTR(state_pen.blink));
+        }
+        else if(streq(linep, "reverse")) {
+          vterm_state_get_penattr(state, VTERM_ATTR_REVERSE, &val);
+          if(val.boolean != state_pen.reverse)
+            printf("! pen reverse mismatch; state=%s, event=%s\n",
+                BOOLSTR(val.boolean), BOOLSTR(state_pen.reverse));
+          else
+            printf("%s\n", BOOLSTR(state_pen.reverse));
+        }
+        else if(streq(linep, "font")) {
+          vterm_state_get_penattr(state, VTERM_ATTR_FONT, &val);
+          if(val.boolean != state_pen.font)
+            printf("! pen font mismatch; state=%d, event=%d\n",
+                val.boolean, state_pen.font);
+          else
+            printf("%d\n", state_pen.font);
+        }
+        else if(streq(linep, "small")) {
+          vterm_state_get_penattr(state, VTERM_ATTR_SMALL, &val);
+          if(val.boolean != state_pen.small)
+            printf("! pen small mismatch; state=%s, event=%s\n",
+                BOOLSTR(val.boolean), BOOLSTR(state_pen.small));
+          else
+            printf("%s\n", BOOLSTR(state_pen.small));
+        }
+        else if(streq(linep, "baseline")) {
+          vterm_state_get_penattr(state, VTERM_ATTR_BASELINE, &val);
+          if(val.number != state_pen.baseline)
+            printf("! pen baseline mismatch: state=%d, event=%d\n",
+                val.number, state_pen.baseline);
+          else
+            printf("%s\n", state_pen.baseline == VTERM_BASELINE_RAISE ? "raise"
+                         : state_pen.baseline == VTERM_BASELINE_LOWER ? "lower"
+                         : "normal");
+        }
+        else if(streq(linep, "foreground")) {
+          print_color(&state_pen.foreground);
+          printf("\n");
+        }
+        else if(streq(linep, "background")) {
+          print_color(&state_pen.background);
+          printf("\n");
+        }
+        else
+          printf("?\n");
+      }
+      else if(strstartswith(line, "?lineinfo ")) {
+        assert(state);
+        char *linep = line + 10;
+        int row;
+        const VTermLineInfo *info;
+        while(linep[0] == ' ')
+          linep++;
+        if(sscanf(linep, "%d", &row) < 1) {
+          printf("! lineinfo unrecognised input\n");
+          goto abort_line;
+        }
+        info = vterm_state_get_lineinfo(state, row);
+        if(info->doublewidth)
+          printf("dwl ");
+        if(info->doubleheight)
+          printf("dhl ");
+        if(info->continuation)
+          printf("cont ");
+        printf("\n");
+      }
+      else if(strstartswith(line, "?screen_chars ")) {
+        assert(screen);
+        char *linep = line + 13;
+        VTermRect rect;
+        size_t len;
+        while(linep[0] == ' ')
+          linep++;
+        if(sscanf(linep, "%d,%d,%d,%d", &rect.start_row, &rect.start_col, &rect.end_row, &rect.end_col) == 4)
+          ; // fine
+        else if(sscanf(linep, "%d", &rect.start_row) == 1) {
+          rect.end_row = rect.start_row + 1;
+          rect.start_col = 0;
+          vterm_get_size(vt, NULL, &rect.end_col);
+        }
+        else {
+          printf("! screen_chars unrecognised input\n");
+          goto abort_line;
+        }
+        len = vterm_screen_get_chars(screen, NULL, 0, rect);
+        if(len == (size_t)-1)
+          printf("! screen_chars error\n");
+        else if(len == 0)
+          printf("\n");
+        else {
+          uint32_t *chars = malloc(sizeof(uint32_t) * len);
+          size_t i;
+          vterm_screen_get_chars(screen, chars, len, rect);
+          for(i = 0; i < len; i++) {
+            printf("0x%02x%s", chars[i], i < len-1 ? "," : "\n");
+          }
+          free(chars);
+        }
+      }
+      else if(strstartswith(line, "?screen_text ")) {
+        assert(screen);
+        char *linep = line + 12;
+        VTermRect rect;
+        size_t len;
+        while(linep[0] == ' ')
+          linep++;
+        if(sscanf(linep, "%d,%d,%d,%d", &rect.start_row, &rect.start_col, &rect.end_row, &rect.end_col) < 4) {
+          printf("! screen_text unrecognised input\n");
+          goto abort_line;
+        }
+        len = vterm_screen_get_text(screen, NULL, 0, rect);
+        if(len == (size_t)-1)
+          printf("! screen_text error\n");
+        else if(len == 0)
+          printf("\n");
+        else {
+          // Put an overwrite guard at both ends of the buffer
+          unsigned char *buffer = malloc(len + 4);
+          unsigned char *text = buffer + 2;
+          text[-2] = 0x55; text[-1] = 0xAA;
+          text[len] = 0x55; text[len+1] = 0xAA;
+
+          vterm_screen_get_text(screen, (char *)text, len, rect);
+
+          if(text[-2] != 0x55 || text[-1] != 0xAA)
+            printf("! screen_get_text buffer overrun left [%02x,%02x]\n", text[-2], text[-1]);
+          else if(text[len] != 0x55 || text[len+1] != 0xAA)
+            printf("! screen_get_text buffer overrun right [%02x,%02x]\n", text[len], text[len+1]);
+          else
+	  {
+	    size_t i;
+            for(i = 0; i < len; i++) {
+              printf("0x%02x%s", text[i], i < len-1 ? "," : "\n");
+            }
+	  }
+
+          free(buffer);
+        }
+      }
+      else if(strstartswith(line, "?screen_cell ")) {
+        assert(screen);
+        char *linep = line + 12;
+	int i;
+        VTermPos pos;
+        VTermScreenCell cell;
+        while(linep[0] == ' ')
+          linep++;
+        if(sscanf(linep, "%d,%d\n", &pos.row, &pos.col) < 2) {
+          printf("! screen_cell unrecognised input\n");
+          goto abort_line;
+        }
+        if(!vterm_screen_get_cell(screen, pos, &cell))
+          goto abort_line;
+        printf("{");
+        for(i = 0; i < VTERM_MAX_CHARS_PER_CELL && cell.chars[i]; i++) {
+          printf("%s0x%x", i ? "," : "", cell.chars[i]);
+        }
+        printf("} width=%d attrs={", cell.width);
+        if(cell.attrs.bold)      printf("B");
+        if(cell.attrs.underline) printf("U%d", cell.attrs.underline);
+        if(cell.attrs.italic)    printf("I");
+        if(cell.attrs.blink)     printf("K");
+        if(cell.attrs.reverse)   printf("R");
+        if(cell.attrs.font)      printf("F%d", cell.attrs.font);
+        if(cell.attrs.small)     printf("S");
+        if(cell.attrs.baseline)  printf(
+            cell.attrs.baseline == VTERM_BASELINE_RAISE ? "^" :
+                                                          "_");
+        printf("} ");
+        if(cell.attrs.dwl)       printf("dwl ");
+        if(cell.attrs.dhl)       printf("dhl-%s ", cell.attrs.dhl == 2 ? "bottom" : "top");
+        printf("fg=");
+        vterm_screen_convert_color_to_rgb(screen, &cell.fg);
+        print_color(&cell.fg);
+        printf(" bg=");
+        vterm_screen_convert_color_to_rgb(screen, &cell.bg);
+        print_color(&cell.bg);
+        printf("\n");
+      }
+      else if(strstartswith(line, "?screen_eol ")) {
+        assert(screen);
+        VTermPos pos;
+        char *linep = line + 12;
+        while(linep[0] == ' ')
+          linep++;
+        if(sscanf(linep, "%d,%d\n", &pos.row, &pos.col) < 2) {
+          printf("! screen_eol unrecognised input\n");
+          goto abort_line;
+        }
+        printf("%d\n", vterm_screen_is_eol(screen, pos));
+      }
+      else if(strstartswith(line, "?screen_attrs_extent ")) {
+        assert(screen);
+        VTermPos pos;
+        VTermRect rect;
+        char *linep = line + 21;
+        while(linep[0] == ' ')
+          linep++;
+        if(sscanf(linep, "%d,%d\n", &pos.row, &pos.col) < 2) {
+          printf("! screen_attrs_extent unrecognised input\n");
+          goto abort_line;
+        }
+	rect.start_col = 0;
+	rect.end_col   = -1;
+        if(!vterm_screen_get_attrs_extent(screen, &rect, pos, ~0)) {
+          printf("! screen_attrs_extent failed\n");
+          goto abort_line;
+        }
+        printf("%d,%d-%d,%d\n", rect.start_row, rect.start_col, rect.end_row, rect.end_col);
+      }
+      else
+        printf("?\n");
+
+      memset(line, 0, sizeof line);
+      continue;
+    }
+
+    else
+      abort_line: err = 1;
+
+    outlen = vterm_output_get_buffer_current(vt);
+    if(outlen > 0) {
+      char outbuff[1024];
+      vterm_output_read(vt, outbuff, outlen);
+
+      term_output(outbuff, outlen, NULL);
+    }
+
+    printf(err ? "?\n" : "DONE\n");
+  }
+
+  vterm_free(vt);
+
+  return 0;
+}
diff --git a/src/libvterm/t/run-test.pl b/src/libvterm/t/run-test.pl
new file mode 100644
index 0000000..3440465
--- /dev/null
+++ b/src/libvterm/t/run-test.pl
@@ -0,0 +1,233 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+use Getopt::Long;
+use IO::Handle;
+use IPC::Open2 qw( open2 );
+use POSIX qw( WIFEXITED WEXITSTATUS WIFSIGNALED WTERMSIG );
+
+my $VALGRIND = 0;
+my $EXECUTABLE = "t/harness";
+GetOptions(
+   'valgrind|v+' => \$VALGRIND,
+   'executable|e=s' => \$EXECUTABLE,
+   'fail-early|F' => \(my $FAIL_EARLY),
+) or exit 1;
+
+my ( $hin, $hout, $hpid );
+{
+   my @command = $EXECUTABLE;
+   unshift @command, "valgrind", "--tool=memcheck", "--leak-check=yes", "--num-callers=25", "--log-file=valgrind.out", "--error-exitcode=126" if $VALGRIND;
+
+   $hpid = open2 $hout, $hin, @command or die "Cannot open2 harness - $!";
+}
+
+my $exitcode = 0;
+
+my $command;
+my @expect;
+
+my $linenum = 0;
+
+sub do_onetest
+{
+   $hin->print( "$command\n" );
+   undef $command;
+
+   my $fail_printed = 0;
+
+   while( my $outline = <$hout> ) {
+      last if $outline eq "DONE\n" or $outline eq "?\n";
+
+      chomp $outline;
+
+      if( !@expect ) {
+         print "# line $linenum: Test failed\n" unless $fail_printed++;
+         print "#    expected nothing more\n" .
+               "#   Actual:   $outline\n";
+         next;
+      }
+
+      my $expectation = shift @expect;
+
+      next if $expectation eq $outline;
+
+      print "# line $linenum: Test failed\n" unless $fail_printed++;
+      print "#   Expected: $expectation\n" .
+            "#   Actual:   $outline\n";
+   }
+
+   if( @expect ) {
+      print "# line $linenum: Test failed\n" unless $fail_printed++;
+      print "#   Expected: $_\n" .
+            "#    didn't happen\n" for @expect;
+   }
+
+   $exitcode = 1 if $fail_printed;
+   exit $exitcode if $exitcode and $FAIL_EARLY;
+}
+
+sub do_line
+{
+   my ( $line ) = @_;
+
+   if( $line =~ m/^!(.*)/ ) {
+      do_onetest if defined $command;
+      print "> $1\n";
+   }
+
+   # Commands have capitals
+   elsif( $line =~ m/^([A-Z]+)/ ) {
+      # Some convenience formatting
+      if( $line =~ m/^(PUSH|ENCIN) (.*)$/ ) {
+         # we're evil
+         my $string = eval($2);
+         $line = "$1 " . unpack "H*", $string;
+      }
+      elsif( $line =~ m/^(SELECTION \d+) +(\[?)(.*?)(\]?)$/ ) {
+         # we're evil
+         my $string = eval($3);
+         $line = "$1 $2 " . unpack( "H*", $string ) . " $4";
+      }
+
+      do_onetest if defined $command;
+
+      $command = $line;
+      undef @expect;
+   }
+   # Expectations have lowercase
+   elsif( $line =~ m/^([a-z]+)/ ) {
+      # Convenience formatting
+      if( $line =~ m/^(text|encout) (.*)$/ ) {
+         $line = "$1 " . join ",", map sprintf("%x", $_), eval($2);
+      }
+      elsif( $line =~ m/^(output) (.*)$/ ) {
+         $line = "$1 " . join ",", map sprintf("%x", $_), unpack "C*", eval($2);
+      }
+      elsif( $line =~ m/^control (.*)$/ ) {
+         $line = sprintf "control %02x", eval($1);
+      }
+      elsif( $line =~ m/^csi (\S+) (.*)$/ ) {
+         $line = sprintf "csi %02x %s", eval($1), $2; # TODO
+      }
+      elsif( $line =~ m/^(osc) (\[\d+)? *(.*?)(\]?)$/ ) {
+         my ( $cmd, $initial, $data, $final ) = ( $1, $2, $3, $4 );
+         $initial //= "";
+         $initial .= ";" if $initial =~ m/\d+/;
+
+         $line = "$cmd $initial" . join( "", map sprintf("%02x", $_), unpack "C*", length $data ? eval($data) : "" ) . "$final";
+      }
+      elsif( $line =~ m/^(escape|dcs|apc|pm|sos) (\[?)(.*?)(\]?)$/ ) {
+         $line = "$1 $2" . join( "", map sprintf("%02x", $_), unpack "C*", length $3 ? eval($3) : "" ) . "$4";
+      }
+      elsif( $line =~ m/^putglyph (\S+) (.*)$/ ) {
+         $line = "putglyph " . join( ",", map sprintf("%x", $_), eval($1) ) . " $2";
+      }
+      elsif( $line =~ m/^(?:movecursor|scrollrect|moverect|erase|damage|sb_pushline|sb_popline|sb_clear|settermprop|setmousefunc|selection-query) ?/ ) {
+         # no conversion
+      }
+      elsif( $line =~ m/^(selection-set) (.*?) (\[?)(.*?)(\]?)$/ ) {
+         $line = "$1 $2 $3" . join( "", map sprintf("%02x", $_), unpack "C*", eval($4) ) . "$5";
+      }
+      else {
+         warn "Unrecognised test expectation '$line'\n";
+      }
+
+      push @expect, $line;
+   }
+   # ?screen_row assertion is emulated here
+   elsif( $line =~ s/^\?screen_row\s+(\d+)\s*=\s*// ) {
+      my $row = $1;
+      my $want;
+
+      if( $line =~ m/^"/ ) {
+         $want = eval($line);
+      }
+      else {
+         # Turn 0xDD,0xDD,... directly into bytes
+         $want = pack "C*", map { hex } split m/,/, $line;
+      }
+
+      do_onetest if defined $command;
+
+      $hin->print( "\?screen_chars $row\n" );
+      my $response = <$hout>;
+      chomp $response;
+
+      $response = pack "C*", map { hex } split m/,/, $response;
+      if( $response ne $want ) {
+         print "# line $linenum: Assert ?screen_row $row failed:\n" .
+               "# Expected: $want\n" .
+               "# Actual:   $response\n";
+         $exitcode = 1;
+         exit $exitcode if $exitcode and $FAIL_EARLY;
+      }
+   }
+   # Assertions start with '?'
+   elsif( $line =~ s/^\?([a-z]+.*?=)\s*// ) {
+      do_onetest if defined $command;
+
+      my ( $assertion ) = $1 =~ m/^(.*)\s+=/;
+      my $expectation = $line;
+
+      $hin->print( "\?$assertion\n" );
+      my $response = <$hout>; defined $response or wait, die "Test harness failed - $?\n";
+      chomp $response; $response =~ s/^\s+|\s+$//g;
+
+      # Some convenience formatting
+      if( $assertion =~ m/^screen_chars/ and $expectation =~ m/^"/ ) {
+         $expectation = join ",", map sprintf("0x%02x", ord $_), split m//, eval($expectation);
+      }
+
+      if( $response ne $expectation ) {
+         print "# line $linenum: Assert $assertion failed:\n" .
+               "# Expected: $expectation\n" .
+               "# Actual:   $response\n";
+         $exitcode = 1;
+         exit $exitcode if $exitcode and $FAIL_EARLY;
+      }
+   }
+   # Test controls start with '$'
+   elsif( $line =~ s/\$SEQ\s+(\d+)\s+(\d+):\s*// ) {
+      my ( $low, $high ) = ( $1, $2 );
+      foreach my $val ( $low .. $high ) {
+         ( my $inner = $line ) =~ s/\\#/$val/g;
+         do_line( $inner );
+      }
+   }
+   elsif( $line =~ s/\$REP\s+(\d+):\s*// ) {
+      my $count = $1;
+      do_line( $line ) for 1 .. $count;
+   }
+   else {
+      die "Unrecognised TEST line $line\n";
+   }
+}
+
+open my $test, "<", $ARGV[0] or die "Cannot open test script $ARGV[0] - $!";
+
+while( my $line = <$test> ) {
+   $linenum++;
+   $line =~ s/^\s+//;
+   chomp $line;
+
+   next if $line =~ m/^(?:#|$)/;
+   last if $line eq "__END__";
+
+   do_line( $line );
+}
+
+do_onetest if defined $command;
+
+close $hin;
+close $hout;
+
+waitpid $hpid, 0;
+if( $? ) {
+   printf STDERR "Harness exited %d\n", WEXITSTATUS($?)   if WIFEXITED($?);
+   printf STDERR "Harness exit signal %d\n", WTERMSIG($?) if WIFSIGNALED($?);
+   $exitcode = WIFEXITED($?) ? WEXITSTATUS($?) : 125;
+}
+
+exit $exitcode;
diff --git a/src/libvterm/tbl2inc_c.pl b/src/libvterm/tbl2inc_c.pl
new file mode 100644
index 0000000..527fc98
--- /dev/null
+++ b/src/libvterm/tbl2inc_c.pl
@@ -0,0 +1,51 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+my ( $encname ) = $ARGV[0] =~ m{/([^/.]+).tbl}
+   or die "Cannot parse encoding name out of $ARGV[0]\n";
+
+print <<"EOF";
+static const struct StaticTableEncoding encoding_$encname = {
+  {
+    NULL, /* init */
+    &decode_table /* decode */
+  },
+  {
+EOF
+
+my $row = 0;
+while( <> ) {
+   s/\s*#.*//; # strip comment
+
+   if ($_ =~ m{^\d+/\d+}) {
+     my ($up, $low) = ($_ =~ m{^(\d+)/(\d+)});
+     my $thisrow = $up * 16 + $low;
+     while ($row < $thisrow) {
+	print "    0x0, /* $row */\n";
+	++$row;
+     }
+   }
+
+   s{^(\d+)/(\d+)}{""}e;                     # Remove 3/1
+   s{ = }{""}e;                            # Remove " = "
+   s{"(.)"}{sprintf "0x%04x", ord $1}e;      # Convert "A" to 0x41
+   s{U\+}{0x};                               # Convert U+0041 to 0x0041
+
+   s{$}{, /* $row */}; # append comma and index
+
+   print "    $_";
+
+   ++$row;
+}
+
+while ($row < 128) {
+   print "    0x0, /* $row */\n";
+   ++$row;
+}
+
+print <<"EOF";
+  }
+};
+EOF
diff --git a/src/libvterm/vterm.pc.in b/src/libvterm/vterm.pc.in
new file mode 100644
index 0000000..8d7e59a
--- /dev/null
+++ b/src/libvterm/vterm.pc.in
@@ -0,0 +1,8 @@
+libdir=@LIBDIR@
+includedir=@INCDIR@
+
+Name: vterm
+Description: Abstract VT220/Xterm/ECMA-48 emulation library
+Version: @VERSION@
+Libs: -L${libdir} -lvterm
+Cflags: -I${includedir}
author	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-07 08:50:31 +0000
committer	Daniel Baumann <daniel.baumann@progress-linux.org>	2024-04-07 08:50:31 +0000
commit	aed8ce9da277f5ecffe968b324f242c41c3b752a (patch)
tree	d2e538394cb7a8a7c42a4aac6ccf1a8e3256999b /src/libvterm
parent	Initial commit. (diff)
download	vim-aed8ce9da277f5ecffe968b324f242c41c3b752a.tar.xz vim-aed8ce9da277f5ecffe968b324f242c41c3b752a.zip