PERFORCE change 153552 for review

[Ed Schouten]

http://perforce.freebsd.org/chv.cgi?CH=153552

Change 153552 by ed at ed_dull on 2008/11/25 19:46:27

	As an experiment, add libteken to the syscons source code.
	
	What's libteken? Our syscons driver uses a terminal type called
	cons25. There's nothing wrong with cons25, but the problem is
	that it isn't really compatible with other systems out there.
	For example, I SSH to my HP2626 switch from syscons, it won't
	work. libteken is an attempt to emulate an xterm-color.
	Eventually we should also place the UTF-8 handling inside
	libteken.
	
	libteken is simply a library that converts input (output from,
	say, a TTY) to drawing commands that can be used by syscons.
	There are a couple of reasons why we want to put this in a
	library:
	
	- Having a well-defined API that doesn't depend on syscons
	  itself allows me to easily develop this in userspace. I've got
	  a simple application built with ncurses that emulates a
	  terminal inside xterm itself.
	
	- It's hard to do right. There are always very small edge cases
	  that can mess up the rendering. If we only write it once, we
	  could for example teach window(1) how to use it as well.
	
	- If we ever get multiple console drivers, it's only a matter of
	  building on top of libteken to get the terminal emulation
	  working properly.
	
	So why did I choose xterm-color? It seems like this is the most
	commonly used terminal type. There are a lot of
	terminal-emulators that already use xterm-color. Even Mac OS X's
	Terminal.app just uses it. It's probably the safest approach.
	
	libteken is hardly finished. There are a lot of loose ends. The
	reason why I'm adding it to the MPSAFE TTY branch already is
	because I want to find out how efficient it is right now and if
	it can be fitted inside the syscons code.

Affected files ...

.. //depot/projects/mpsafetty/sys/conf/files#27 edit
.. //depot/projects/mpsafetty/sys/dev/syscons/teken/teken.c#1 add
.. //depot/projects/mpsafetty/sys/dev/syscons/teken/teken.h#1 add
.. //depot/projects/mpsafetty/sys/dev/syscons/teken/teken_internal.h#1 add
.. //depot/projects/mpsafetty/sys/dev/syscons/teken/teken_state.c#1 add
.. //depot/projects/mpsafetty/sys/dev/syscons/teken/teken_subr.c#1 add

Differences ...

==== //depot/projects/mpsafetty/sys/conf/files#27 (text+ko) ====

@@ -1270,6 +1270,9 @@
 dev/syscons/star/star_saver.c	optional star_saver
 dev/syscons/syscons.c		optional sc
 dev/syscons/sysmouse.c		optional sc
+dev/syscons/teken/teken.c	optional sc
+dev/syscons/teken/teken_state.c	optional sc
+dev/syscons/teken/teken_subr.c	optional sc
 dev/syscons/warp/warp_saver.c	optional warp_saver
 dev/tdfx/tdfx_linux.c		optional tdfx_linux tdfx compat_linux
 dev/tdfx/tdfx_pci.c		optional tdfx pci