Copyright 1997,1998 by Thomas E. Dickey

# Contents

This file contains a list of the changes that I have made for XFree86 xterm, from the notes that I add when submitting a patch.

You should note that other changes have been made as well, by other people, to fix bugs and correct ifdef's for portability. All of these are summarized in the XFree86 CHANGELOG (found in the unbundled tree, xc/programs/Xserver/hw/xfree86).

- Patch #68 - 1998/3/4 - XFree86 3.9Ad and 3.3.1z
- Patch #67 - 1998/2/23 - XFree86 3.9Ad and 3.3.1e
- Patch #66 - 1998/2/16 - XFree86 3.9Ad and 3.3.1d
- Patch #65 - 1998/2/14 - XFree86 3.9Ad and 3.3.1c
- Patch #64 - 1998/2/8 - XFree86 3.9Ad
- Patch #63 - 1998/2/5 - XFree86 3.9Ad
- Patch #62 - 1998/1/23 - XFree86 3.9Ac
- Patch #61 - 1998/1/17 - XFree86 3.9Ac
- Patch #60 - 1998/1/10 - XFree86 3.9Ab
- Patch #59 - 1998/1/5 - XFree86 3.9Ab
- Patch #58 - 1998/1/3 - XFree86 3.9Ab
- Patch #57 - 1997/12/26 - XFree86 3.9Aa
- Patch #56 - 1997/11/28 - XFree86 3.9x
- Patch #55 - 1997/11/25 - XFree86 3.9x
- Patch #54 - 1997/10/17 - XFree86 3.9s
- Patch #53 - 1997/10/12 - XFree86 3.9r
- Patch #52 - 1997/9/29 - XFree86 3.9q
- Patch #51 - 1997/9/15 - XFree86 3.9p
- Patch #50 - 1997/8/22 - XFree86 3.9m
- Patch #49 - 1997/8/10 - XFree86 3.9k
- Patch #48 - 1997/7/26 - XFree86 3.9j
- Patch #47 - 1997/7/13 - XFree86 3.9i
- Patch #46 - 1997/7/4 - XFree86 3.9h
- Patch #45 - 1997/7/2 - XFree86 3.9h
- Patch #44 - 1997/6/22 - XFree86 3.9g
- Patch #43 - 1997/6/10 - XFree86 3.9d
- Patch #42 - 1997/6/8 - XFree86 3.2Xl
- Patch #41 - 1997/5/28 - XFree86 3.2Xl
- Patch #40 - 1997/5/26 - XFree86 3.2Xl
- Patch #39 - 1997/5/24 - XFree86 3.2Xl
- Patch #38 - 1997/5/22 - XFree86 3.2Xh
- Patch #37 - 1997/5/7 - XFree86 3.9a
- Patch #36 - 1997/1/16 - XFree86 3.2r
- Patch #35 - 1997/1/7 - XFree86 3.2o
- Patch #34 - 1997/1/5 - XFree86 3.2o
- Patch #33 - 1996/11/24 - XFree86 3.2
- Patch #32 - 1996/11/21 - XFree86 3.2
- Patch #31 - 1996/11/16 - XFree86 3.2
- Patch #30 - 1996/11/16 - XFree86 3.2
- Patch #29 - 1996/9/15 - XFree86 3.1.2Gb
- Patch #28 - 1996/8/31 - XFree86 3.1.2F
- Patch #27 - 1996/8/21 - XFree86 3.1.2Ek
- Patch #26 - 1996/8/20 - XFree86 3.1.2Ei
- Patch #25 - 1996/8/18 - XFree86 3.1.2Ei
- Patch #24 - 1996/8/11 - XFree86 3.1.2Ee
- Patch #23 - 1996/7/31 - XFree86 3.1.2Ec
- Patch #22 - 1996/7/26 - XFree86 3.1.2Ec
- Patch #21 - 1996/7/24 - XFree86 3.1.2Ec
- Patch #20 - 1996/7/24 - XFree86 3.1.2Ec
- Patch #19 - 1996/7/21 - XFree86 3.1.2Ec
- Patch #18 - 1996/7/18 - XFree86 3.1.2Ec
- Patch #17 - 1996/7/2 - XFree86 3.1.2Eb
- Patch #16 - 1996/6/25 - XFree86 3.1.2Ea
- Patch #15 - 1996/5/29 - XFree86 3.1.2E
- Patch #14 - 1996/5/12 - XFree86 3.1.2Dj
- Patch #13 - 1996/4/23 - XFree86 3.1.2Df
- Patch #12 - 1996/3/16 - XFree86 3.1.2Dc
- Patch #11 - 1996/3/5 - XFree86 3.1.2Db
- Patch #10 - 1996/2/14 - XFree86 3.1.2Cd
- Patch #9 - 1996/2/10 - XFree86 3.1.2Cb
- Patch #8 - 1996/2/9 - XFree86 3.1.2Cb
- Patch #7 - 1996/1/28 - XFree86 3.1.2n
- Patch #6 - 1996/1/8
- Patch #5 - 1996/1/7
- Patch #4 - 1996/1/7
- Patch #3 - 1996/1/7
- Patch #2 - 1996/1/7
- Patch #1 - 1996/1/6

# Patch #68 - 1998/3/4 - XFree86 3.9Ad and 3.3.1z

This corrects another problem with the logic for highlightColor resource. As reported by David Dawes:

> I've just noticed a problem with with the "inverse" control sequence (ESC[7m) with the 3.3.2 xterm. What it does is sets the background black, and the text the usual foreground colour rather than simply swapping the foreground/background.

This appears to be because when I added logic to check that the highlightColor was distinct from foreground and background colors, I did not add a further check to see that it was not black (I would make an explicit check for the resource not being set, but see nothing definite in the headers that would let me reference an explicitly-undefined Pixel value, though there are some implications in xpm.h). But this should work.

# Patch #67 - 1998/2/23 - XFree86 3.9Ad and 3.3.1e

This patch does the following:

- improve test for highlightColor so that xterm does not attempt to use that unless it is different from the foreground and background colors (reported by Stefan Dalibor <Stefan.Dalibor@informatik.uni-erlangen.de>.

  I could not reproduce this until I noticed that the -rev option exposed it nicely.

- remove ich and ich1 from xterm and xterm-8bit terminfo descriptions. SVr4 terminfo documents that you must not combine these with smir/rmir, but ncurses allows it, opening a hole. Solaris 2.6 vi does not work properly if it is using a terminfo description when these are combined, since it was written to accommodate old terminals that required it (reported by Stephen Marley).
- restore 1-pixel overlap of scrollbar border with left edge of window (reported by Jim Burmeister <jimb@metrolink.com>).
- add a configure option, --enable-logfile-exec, which allows the user to specify a pipe for logfile. This defines ALLOWLOGFILEEXEC.
- makes the ALLOWLOGFILEEXEC code compile & run, if configured.
- minor documentation nits.

# Patch #66 - 1998/2/16 - XFree86 3.9Ad and 3.3.1d

This fixes the problem reported with failure to build the resize program (BSDI, OSF/1) due to not having <termcap.h>, by changing the ifdef to one that would be set only if the file exists (not currently specified, except by the standalone configure script). We do not really need to include <termcap.h> to build, but only for a clean compile, since it may declare the tgetent() prototype. I also updated the man-page for resize, since I had recently noticed that it can be used to resize xterm using the "Sun" control sequences option.

# Patch #65 - 1998/2/14 - XFree86 3.9Ad and 3.3.1c

This is a small patch to xterm's 8-bit terminal description. I noticed while testing ncurses that I had specified the wrong (VT100-style) codes for the F1-F4. Xterm only uses VT220-style function keys in 8-bit mode.

# Patch #64 - 1998/2/8 - XFree86 3.9Ad

This fixes the following problems with xterm:

- save/restore the ANSI foreground and background colors with the other visible attributes in the save-cursor and restore-cursor operations. This works around a problem with vim, which apparently assumed that switching between the normal and alternate screens resets the colors (reported by Jim Battle <jb@chromatic.com>).

  It would be nice to implement save/restore cursor as a stack (and solve this type of problem completely), but that would lead to incompatibility with applications which assume they are running with a VT100 or VT220.

- corrects behavior of a restore-cursor operation which does not follow a save-cursor (it is supposed to set the character sets to a known initial state).
- extends the sunKeyboard resource (and menu toggle) to modify the home, end and delete keys on a Sun or PC editing keypad, making them generate codes compatible with DEC VT220's Find, Select and Remove keys.
- corrects a length in checking command-line options, which caused the "-help" message to not work when X was not running.
- adds some detail to the man-page (requested by Jason Bacon <acadix@execpc.com>)
- modify the standalone configure script to ignore the broken nsl and socket libraries on IRIX 6.2 (the ones on 5.2 also are broken, so this change just widens the check for the system version number).

# Patch #63 - 1998/2/5 - XFree86 3.9Ad

This is another patch from Bjorn Helgaas <helgaas@rsn.hp.com>, which I've reviewed (and learned some). Following are his notes:

I poked around some more and finally got xterm-62 to build and run cleanly on HP-UX 10.20. Here are the patches. They look sort of ugly, so here's a little explanation:

- aclocal.m4: Removed side effects from the AC_CACHE_VAL commands in CF_FUNC_TGETENT. Previously, LIBS was set inside AC_CACHE_VAL, which worked fine the first time configure was run, but failed if there were cached values.
- aclocal.m4: Added temporary setting of LIBS before AC_TRY_LINK in CF_FUNC_TGETENT. Previously, the last value set by the AC_TRY_RUN loop was used, so only -lcurses was checked.
- configure.in: Added temporary setting of CPPFLAGS before AC_CHECK_HEADERS for X11 files. Previously <X11/DECkeysym.h> and <X11/Xpoll.h> were found only if they were in the compiler's default include directories, even if `--x-includes=DIR' had been used or AC_PATH_XTRA had found them elsewhere.

The problem on HP-UX was that we were linking with -lcurses rather than -ltermcap due to the second bullet above, and apparently something in HP-UX curses is broken. This seems very strange, because the only thing used is tgetent, which should affect any tty/pty configuration, but I lost interest in tracking down the exact problem.

# Patch #62 - 1998/1/23 - XFree86 3.9Ac

This is a patch mostly by Bjorn Helgaas <helgaas@dhc.net> (I added the os2main.c change, and a little of the documentation). From Bjorn's description:

- If you use the "-hc <color>" option or set the "highlightColor" resource, text is highlighted by changing only the background color, rather than using reverse video. I find this easier to read, especially when selecting multi-colored text, and it is similar to the way netscape shows selections.
- Most of the code changes are under "#if OPT_HIGHLIGHT_COLOR". The principal exception is in screen.c, where I added a couple calls to resetXtermGC(). This seems like it could be a bug even without the color highlighting changes (though I don't pretend to understand all the logic).

# Patch #61 - 1998/1/17 - XFree86 3.9Ac

This patch modifies the reset behavior of xterm slightly:

- change the terminfo entry so that rs1 (one of the strings used by the 'reset' program) does a hard reset rather than switching character sets. This is more in accord with other terminal descriptions.
- modifies the treatment of hard reset by the xterm program to reset the saved lines.
- corrects hard reset by also resetting user-defined keys (DECUDK).

# Patch #60 - 1998/1/10 - XFree86 3.9Ab

This fixes some minor bugs and adds new functionality:

- add support for blinking text.
  - This does not actually cause the text to flash, but text with the blink attribute can be displayed in color, using new resources colorBL and colorBLMode.
  - If colors are not used, the blinking text will be displayed as before (just like bold). The main purpose of this is to make applications work properly when they assume the emulator supports blinking text.
  - I did this by moving the per-cell LINEWRAPPED flag to a per-line flag, to make room for the new BLINK flag. There were no per-line flags, so this changes a lot of logic.
- corrected missing save-cursor logic in the handling of SGR 1048 (the new control sequence I added in patch #54, 1997/10/17). Reported by Darren Hiebert.
- flush the output of the transparent printing after each line Reported by Tomas Vanhala <vanhala@ling.helsinki.fi>.
- correct the modes that are affected by save/restore cursor by adding WRAPAROUND and PROTECTED.
- corrected placement of one of the XSync calls that I added in patch #51, 1997/9/15, which had the side-effect of writing on the window border when the xterm was resizing from 132 to 80 columns.
- work around an incompatibility of the XKB definition used in xterm versus that symbol from IRIX 6.2's imake definitions (by adjusting the standalone configure script).

# Patch #59 - 1998/1/5 - XFree86 3.9Ab

My last patch has an off-by-one error in the comparison for argc. Douglas Kosovic <douglask@dstc.edu.au> showed me where (he got a core dump). Also, I think this explains Clint Olsen's problem, but the symptoms were more subtle (EINVAL for a system call if the -display option is omitted).

# Patch #58 - 1998/1/3 - XFree86 3.9Ab

This patch does the following:

- implement logic to permit xterm to work with proportional fonts.
  - Thomas Wolff <Thomas.Wolff@sietec.de> requested this (but it isn't exactly what he's asking for - that's a more involved task).
  - I chose to do this by rendering the characters on a fixed pitch, because it would not be useful for existing applications to display varying numbers of characters on each line.
  - Except that this forces the display to be wider, it works reasonably well. A couple of special cases (reverse + colorBD, for example) do not display with proper colors, since the inter-character gaps are painted with the background.
- added a version number to the program (several people have requested this).
- make the -version and -help options interpreted before the program attempts to open the display.
- minor reorganization of the man-page (ordered the options, resources and translations alphabetically - and eliminated some duplication).
- corrected a misspelled filename in Makefile.in, and added a lint rule.
- updated the configure script to correct behavior when it cannot find imake, as well as to fix the IRIX+gcc build (conflict with /usr/include).
- regenerated the configure script with a newer patch to autoconf that fixes a problem with environment space vs the configure --help message.

# Patch #57 - 1997/12/26 - XFree86 3.9Aa

This patch is mostly concerned with the standalone configure script; a few minor corrections are added:

- add configure option --disable-tek4014, to allow xterm to be built without the tek4014 emulation.
- add configure option --with-terminal-type, to allow xterm to be compiled with default $TERM value other than "xterm" (e.g., "xterm-16color") -- requested by Stephen Marley <stephen@memex.com>.
- fix a typo in the configure --help message -- reported by Darren Hiebert <darren@hmi.com>.
- review diffs between main.c and os2main.c, to make them more alike. (applies some minor bugfixes to OS/2's version).
- add missing quotes in memmove/bcopy configure test

# Patch #56 - 1997/11/28 - XFree86 3.9x

This patch is based on analysis by Arfst Ludwig <arfst@luxor.IN-Berlin.DE>, who reported:

Setting the following resources xterm (all current versions) receives a segmentation fault on <Btn2Up> after scrolling:

    	  *XTerm*VT100*translations:    #override \
    	      ~Shift~Ctrl<Btn2Up>: insert-selection(PRIMARY, CUT_BUFFER0)\n\
    	      Shift~Ctrl<Btn2Up>:  insert-selection(CLIPBOARD, CUT_BUFFER1)\n\
    	      ~Shift<BtnUp>:       select-end(PRIMARY, CUT_BUFFER0)\n\
    	      Shift<BtnUp>:        select-end(CLIPBOARD, CUT_BUFFER1)

(The above resources intention is to be able to paste the latest selection even if the xterm was cleared.)

And here is how it works (and a fix!): The widget given to the action handler as first argument is not guaranteed to be a XtermWidget (it can be the ScrollbarWidget). Instead of accessing the widget's member directly XtDisplay gives the required pointer in a safe way.

I noticed that this was not the only instance (by reading the code, and testing with his example), and extended the solution to check the widget-class to ensure that it is indeed xterm's widget class before attempting to use it in the context of translations.

# Patch #55 - 1997/11/25 - XFree86 3.9x

This fixes the segmentation violation noted by Rogier Wolff about a month ago. He'd set xterm to 400 (rows) by 150 columns, which broke because there were limited buffers (200 rows) used for juggling data when adding or deleting lines and for switching between alternate and normal screens. I replaced this by an allocated buffer.

The bug is simple to test if you set titeInhibit false.

# Patch #54 - 1997/10/17 - XFree86 3.9s

This patch does the following:

- correct a minor placement problem with the right scrollbar.
- implement a new set of control sequences for switching between the normal and alternate VT100 screens. These work around the older sequences limitation that required modification of the runtime $TERMCAP to cooperate with the titeInhibit resource (that can't work with terminfo). I do this by moving all of the functionality of the rmcur terminfo capability into the control sequences.
- implement the alternate-screen menu entry

# Patch #53 - 1997/10/12 - XFree86 3.9r

This patch adds a fix and implements a new feature (as well as some minor typos):

- JCHANDRA@Inf.COM (JCHANDRA) noted that there was still a problem with the wait call with the logging option. It hung when the logfile was opened as a command-line option. I fixed this by moving the StartLogging() call down past the place where I'd reset the setuid mode. So the logfile is opened as the real user, without having to fork.
- Michael Rohleder <michael.rohleder@stadt-frankfurt.de> sent me a patch which implements right-scrollbars for xterm. I used that as a starting point, renamed the command-line options and reduced the number of ifdef's.

# Patch #52 - 1997/9/29 - XFree86 3.9q

This patch addresses bugs and requests reported by

- Bob Maynard <rmaynard@montana.com>,
- Clint Olsen <olsenc@ichips.intel.com>,
- JCHANDRA@Inf.COM (JCHANDRA),
- Michael Schroeder <Michael.Schroeder@informatik.uni-erlangen.de>,
- Pablo Ariel Kohan <pablo@memco.co.il>

Some of the changes are interrelated (it was an unusually busy week).

- change the default resource value for colorMode to true, matching the Xterm.ad file.
- correct behavior of 'ech' control, making the default and 0 parameters erase one character rather than to the end of line (reported by Michael Schroeder).
- add resource boldColors, command-line options +pc and -pc and configure-script option to specify behavior of xterm's mapping bold colors 0 through 7 to colors 8 through 15. (request by Pablo Ariel Kohan).
- add resource colorAttrMode to specify whether colorULMode and colorBDMode can override the ANSI colors (from a problem report by Clint Olsen).
- correct a conflict between colorULMode/colorBDMode versus ANSI colors, where exposure events would occasionally pick up the former (e.g., colorBD) rather than ANSI colors. Testing the colorAttrMode made this apparent, though it has been in the code since 3.2A (patch #35 in Jan 1997).
- correct two problems with the optional logging support. On Linux at least, the waitpid call in creat_as hangs when the logging is toggled from the popup menu. Also, the mktemp template has the wrong number of X's (since X11R5!). Fixed the waitpid problem by exploiting the fact that the setuid behavior is reset before the popup menus are available. (reported by Jayachandran C.).
- add configure script options for building with the Xaw3d and neXtaw libraries.
- correct CF_IMAKE_CFLAGS standalone configure script macro, so that it will pick up $(ALLDEFINES) rather than $(STD_DEFINES). This is needed to make scrollbars work on Linux, since that uses narrow prototypes. (reported by Bob Maynard).
- various minor updates to configure-script macros.

# Patch #51 - 1997/9/15 - XFree86 3.9p

Most of this patch is related to the standalone configure script, though there are fixes/enhancements as well:

- add a new resource sunKeyboard, with associated command-line option and menu-toggle that allows using a normal Sun or PC keyboard to generated the complete DEC-style function keys and keypad.
- correct a reversed foreground/background test in the control sequence that replies with the current SGR settings.
- correct, by invoking XSync, a display problem that caused the program to not properly update newly exposed areas when a font change or 80/132 resize request was not completely accepted.
- restructured autoconf macros (I made a library of all of the macros across the complicated configure scripts I'm working on).
- use the autoconf config.guess and config.sub scripts to better identify the host-os.
- improve the configure script that uses 'imake' as a fallback for definitions.
- correct several instances of unsigned/signed mixed expressions.

I've tested the configure script on Linux, SunOS 4.1.3, Solaris 2.5.1, IRIX 5.2 and 6.2, AIX 3.2.5 and CLIX 3.1 (all but the last run properly as well).

# Patch #50 - 1997/8/22 - XFree86 3.9m

This is a collection of small fixes, and a couple of minor enhancements:

- plug a security hole in the implementation of Media Copy (print) by invoking setuid just before the main loop.
- add an ifdef'd include for <sys/termio.h> for HP-UX, which allows the program to process SIGWINCH events (this is a bug in X11R6.3)
- add state-table entries for VT52 emulation to enter/exit keypad application mode.
- disable the popup-menu entry for 8-bit controls when the terminal-id is less than 200 (e.g., VT52 or VT100).
- ensure that the popup-menu entry for 8-bit controls is updated when the application enables/disables this mode, including the response to a full-reset.
- implement VT300 DECBKM feature: set interpretation of the backarrow key to either backspace or delete. The initial setting is via resource; it can also be modified in the main popup menu.
- implement VTxxx KAM (ISO AM), which allows a keyboard to be locked (i.e., the terminal discards input).
- implement VTxxx SRM, which is used to control local echoing of input on the terminal.
- add terminfo and termcap entries for xterm-8bit, a variation of the xterm description that uses 8-bit control characters.
- add fallback definitions for Imakefile to allow it to work on some X11R5 systems that have no SpecialCObjectRule or ProgramTargetName macros.
- add .c.o and .c.i rules to standalone Makefile.in
- correct order of -lXmu and -lXext in standalone configure script.
- add configure script options to allow selective disabling of active-icon, input-method and i18n code (mainly for users with X11R5 or an incomplete X11R6 configuration).
- change menu-indices from #define's to enum values, thereby making it work better with the ifdef's for logging and active-icon (the X11R6.3 active-icon code is incorrectly ifdef'd; this corrects an error introduced by incorporating that code).
- correct minor compile errors in the configuration where active-icon is not used.
- add configure option to suppress echoing of long compiler commands
- correct spelling of decTerminalID in configure script help message
- use gcc __attribute__((unused)) to quiet warnings about unused parameters when compiling with -W (to make it simpler to find the real problems).

# Patch #49 - 1997/8/10 - XFree86 3.9k

This patch implements the VT100/VT220 Media Copy (i.e., print-screen) control sequences.

# Patch #48 - 1997/7/26 - XFree86 3.9j

This patch does the following (all but the first affect only the standalone configure script):

- minor correction to positioning of underlines for small (e.g., 5x8) font size.

  The existing behavior allowed underlines to be drawn outside the character-cell, so they weren't cleared properly under some circumstances.

- adds more special-case tokens to the standalone configure script's imake-option filter (e.g., "&&", since a "make -n main.o" on my IRIX system uses that shell construct).
- adds a '--enable-logging' option for the standalone configure script.
- adds check and ifdef's for the standalone configure script to allow for building on platforms with X11R6, which lacks Xpoll.h (introduced in X11R6.1).

# Patch #47 - 1997/7/13 - XFree86 3.9i

This patch does the following

- corrects an indexing error in the doublesize character logic (button.c) that caused core dump (this was reported by J. Wunsch).
- corrects the logic of ShowCursor when it is painting in a doublesize cell (charproc.c).
- corrects, according to vttest, the behavior when switching to doublesize characters and back again (doublechr.c).
- adds cbt (back_tab) to the terminfo description (this was something that I'd overlooked as applicable to curses optimization last summer).
- corrects, for the standalone xmc test, the logic for disabling xmc.

# Patch #46 - 1997/7/4 - XFree86 3.9h

This is a patch to provide test-support for some work I'm doing on ncurses. It does not modify the normal configuration of xterm; the code is compiled if the standalone configure option "--enable-xmc-glitch" is specified.

# Patch #45 - 1997/7/2 - XFree86 3.9h

This fixes the problem reported with xterm's cursor color versus the background (the second chunk in this patch) and also removes some duplicate initialization of the cursor GC's. If the cursor color at startup is the same as the background, then xterm will use the reverse GC, ignoring the setting of the colorMode resource.

# Patch #44 - 1997/6/22 - XFree86 3.9g

This implements the first part of the VT100 doublesize characters for xterm, as well as fixing a handful of bugs:

- the doublesize character support uses the normal font (using scaled fonts will be another patch) with blanks to simulate doublesize characters. This patch does most of the global changes that'll be required. I've hidden most of the details in macros and ifdefs so it's easy to configure out (part of the patch is a configure option for that purpose).
- corrected limits in DeleteChar() function -- it's always ignored the size of the left border and scrollbar. I noticed this when working on the doublesize characters since the glitch was doubled in size (i.e., it wrapped some garbage around the right margin).
- corrected 'memmove()' logic, for standalone builds (it referenced a malloc wrapper from my development library).
- add a check for HideCursor() to prevent repeated screen updates (which can cause a spurious cursor glitch to appear, e.g., during scrolling). I noticed this with the 3.2A version (but only a few weeks ago, when I started working on this patch).

# Patch #43 - 1997/6/10 - XFree86 3.9d

Here's a fix for two problems:

- modify handling of tgetent results in xterm and resize programs to make them tolerant of missing termcap file, or unknown terminal name. In this scheme, an explicit "-tn" option will succeed, overriding the fallback list.
- a nit in the configure script (log extra information to help diagnose which case of the test-compile of tgetent was used).

# Patch #42 - 1997/6/8 - XFree86 3.2Xl

Bram Moolenaar reported that the cursor color changed unexpectedly while scrolling. The cause was that it used the same GC's as the logic that draws the ANSI colors. The bug only appears if the cursorColor resource isn't set, and has been present since the initial implementation early last year. (The same bug also appears in rxvt ;-). Here's a fix.

# Patch #41 - 1997/5/28 - XFree86 3.2Xl

Some nits found by Darren Hiebert (missing part of install-rule, incorrect assignment for --enable-color-mode option).

# Patch #40 - 1997/5/26 - XFree86 3.2Xl

Patch for the configure script's logic for obtaining imake predefined symbols.

# Patch #39 - 1997/5/24 - XFree86 3.2Xl

This patch does the following:

- integrate the 16-color change for 'xterm'
- minor fixes/clarification of tgetent in terminfo vs termcap to 'resize'

(both changes also modify the configure script)

# Patch #38 - 1997/5/22 - XFree86 3.2Xh

This implements a simple configuration script with autoconf (to which I'll add more options later). It does the following:

- configures xterm to build with X11R5 (at least on SunOS 4.1, Solaris 2.4, possibly IRIX - sorry network was down today, but I did test an earlier version yesterday).
- enables/disables the configuration ifdefs for ANSI color and VT52 emulation.

It does not make tests for the things that imake does (that's another project), instead it uses a hybrid of the autoconf tests for libraries and adds imake's compiler options (which are necessary in some cases to get main.c to compile).

# Patch #37 - 1997/5/7 - XFree86 3.9a

This corrects a minor, but annoying error in the vt220 emulation: the DECUDK is only supposed to be interpreted for _shifted_ function keys.

# Patch #36 - 1997/1/16 - XFree86 3.2r

This corrects something that I overlooked in patch #27 (21-aug-1996), which is that when trimming the region to be repainted for the highlightSelection resource of xterm, I still have to paint the background past the highlighted region. This only happens when I first do a selection in a window that's partly off-screen, then move the window on-screen.

# Patch #35 - 1997/1/7 - XFree86 3.2o

This patch does the following:

- combines the coding for foreground and background colors into a single byte, reducing the memory required to store saved-lines in color. (I'll take back that byte in a following patch to use to ensure the character-set, so there's no long-term decrease in memory use).
- modifies the PF1-PF4 coding in termcap/terminfo. Because xterm is still by default emulating vt100, the function key codes are vt100-compatible (I overlooked this in patch #31). I also reformatted the whole terminfo file into a single-column, for consistency.
- adds an interim xterm-vt220 description to accommodate the old and new styles of function-keys (though probably it'd be better to drop the old-style altogether).

# Patch #34 - 1997/1/5 - XFree86 3.2o

This patch does the following:

- implement DECSTR (soft terminal reset). The biggest diff is due to adding another state table (note that there's only one useful state here, but it's only 256 bytes rather than 1k as it would have been before I reduced the size of state entries).
- some minor tidying up (e.g., signed/unsigned use bitcpy, MODE_DECCKM, resetColor, resetCharsets). More is done in patch #35.

I got the description of DECSTR from a vt420 user's manual. I'll do some testing with vttest to ensure that there's nothing else to do than what was documented.

# Patch #33 - 1996/11/24 - XFree86 3.2

This adds to the reset-fix by Matthieu Herrb <Mathieu.Herrb@mipnet.fr> a small change to make xterm able to output 8-bit characters in VT100 mode. Applications that run on real VT100's don't do that anyway, and this feature should be removed sometime after finishing off the VT220 emulation (VT220's can do 8-bit characters). That would be a good time to change the default terminal-id to 220.

# Patch #32 - 1996/11/21 - XFree86 3.2

This implements the REP (repeat) control for xterm. That isn't part of the DEC VTxxx series, but is defined in ISO 6429. (Note that the base xterm terminal description is not changed -- I added a variant, "xterm-rep").

# Patch #31 - 1996/11/16 - XFree86 3.2

This implements vt52 emulation in xterm (ifdef'd so it can be removed). I've been using it for testing for the past month or so.

# Patch #30 - 1996/11/16 - XFree86 3.2

From bug-report by <auroux@clipper.ens.fr> (Denis Auroux), missing reset to ground state. I checked through the rest of that table and found another, in the unimplemented MC (screen print).

# Patch #29 - 1996/9/15 - XFree86 3.1.2Gb

This patch does the following:

- corrects the restoration of color for bold/underline color mode
- adds a resource 'decTerminalID' to control the reporting level of xterm (e.g., VT100, VT220).
- uses the new resource to implement/correct the DA1, DA2 and DECRPTUI reports.
- change valid-response code in DECRQSS from 0 to 1 (the manual says 0, but the VT420 terminal I've been testing on says 1).

All of these changes are based on vttest 2.6

(Most of the volume in the patch is to add 2 more state tables for parsing the 2nd/3rd device-attribute controls).

# Patch #28 - 1996/8/31 - XFree86 3.1.2F

This patch corrects the following reported by Roland Rosenfeld <roland@spinnaker.rhein.de>:

- handle SGR 22, 24 and 25 in combination with colorUL and colorBD resources. Also noted & fixed reset of colored underline/bold with SGR 0.
- a typo in the termcap (missing '['), from 3.1.2Dj (my error)

Roland also complained that he couldn't use box characters with

    	-adobe-courier-bold-r-normal--12-120-75-75-m-70-iso8859-1

but that's a known xterm limitation (the box characters must be part of the font, in the first 32 locations).

# Patch #27 - 1996/8/21 - XFree86 3.1.2Ek

This patch fixes one of my long-term gripes: xterm's selection doesn't clearly show what's being selected (as per David's request, it's controlled by a resource, which defaults to the older behavior).

# Patch #26 - 1996/8/20 - XFree86 3.1.2Ei

Here's a patch to fix a problem with xterm's cut/paste and another to modify the appearance of the highlighting while selecting. (The changes are independent, so you can see if the change to screen.c is desirable).

# Patch #25 - 1996/8/18 - XFree86 3.1.2Ei

Here's a correction for two minor bugs that I picked up in testing, plus some lint (from Solaris 2.5) where NULL was used incorrectly:

- make the second alternate font the same as the first (that's what vt420 and dtterm do)
- corrected DECSCL report when DECSCL hasn't been set (i.e., don't return a '60').

# Patch #24 - 1996/8/11 - XFree86 3.1.2Ee

This patch does several things. In effect, xterm can (I think) do a reasonably good job of emulating vt220 and vt320 terminals (as well as it was doing vt100, at any rate ;-).

It does NOT do:

- soft fonts
- rigel or sixel graphics

Anyway, I:

- added ECH, CPL, CNL, SU, SD, CBT, CHT controls
- added popup-menu for switching between DEC and Sun function keys. (corrected alignment err wrt logging entry at that point).
- make xterm recognize both 8-bit and 7-bit controls (including popup menu for switching modes).
- add user-definable function keys (aka DECUDK)
- support concealed text
- support protected text (both ISO compatible and DEC compatible - that's not the same thing, btw), with SPA, EPA, DECSCA, DECSED, DECSEL controls.
- implement DECSCL.

I'll be continuing to test this patch for a while, but don't expect to add any new functionality (it passes all of the current tests I've built in vttest, but I need to make more tests)..

# Patch #23 - 1996/7/31 - XFree86 3.1.2Ec

This removes the blinking cursor I added last week (for performance reasons). Time-permitting, I'll revisit this after 3.2 is released (there will be more work after XFree86 3.2, I assume).

# Patch #22 - 1996/7/26 - XFree86 3.1.2Ec

I looked more closely at my "double-negative" and realized that I had been confused by the default color scheme (black on white) in combination with reverse video. However, I did see that the original_fg and original_bg data weren't really used - so I removed that logic.

Also:

- during initialization, check if ANSI colors are set with non fg/bg values, disable color mode if not. This makes xterm tolerant of applications that allocate the whole color map.
- implemented blinking cursor (default is off)

# Patch #21 - 1996/7/24 - XFree86 3.1.2Ec

This patch does the following:

- fixes some minor typography in the control-sequences documentation (it didn't occur to me til I'd sent the last patch that I could use ghostview for previewing the troff output ;-)
- adjusts the shell's background color in ReverseVideo so that flicker in resizing is reduced
- adds an ifdef OPT_ISO_COLORS to allow configuring xterm without the ISO color support (saves a lot of memory)
- used that ifdef to isolate/modify logic so that if the user doesn't have the colorMode enabled, then ISO color support is disabled (saving memory).

  (If anyone needs numbers, I had savedLines set to 2000, and found a reduction from ~700k to ~400k of allocated memory, according to Purify).

# Patch #20 - 1996/7/24 - XFree86 3.1.2Ec

This documents the changes in control sequences for window operations that I added in my previous patch. I'm testing another patch that allows the user to use less memory if colors aren't needed.

# Patch #19 - 1996/7/21 - XFree86 3.1.2Ec

This patch does the following:

- fixes the core dump that I reported on IRIX 5.2 (in main.c)

  (it's worth noting that this bug exists in X11R6.1, so I'd like to assume that someone's already submitted a fix to X Consortium...)

- change the interpretation of zero rows or columns in a resize-window request to use the root window's size (looking more carefully at dtterm, that seems to be what it does).
- change some memmove calls to memcpy for slightly better performance. (also, a couple of memset calls to bzero - Quantify says bzero runs 20% faster, I assume because there's one less argument).
- interpret character sets 1 and 2 (so that vttest gives a reasonable result) Both rxvt and dtterm do something equivalent.
- fix a minor memory leak in the logic that retrieves the window or icon names (Purify found this for me while I ran vttest).

# Patch #18 - 1996/7/18 - XFree86 3.1.2Ec

This implements the following:

- escape sequences that act like the CDE dtterm's window operations (though I have implemented the default width and height -- I've seen a rather buggy dtterm running that seems to treat width=0 or height=0 literally -- maybe that's a feature, not a bug?)
- minor tweak to the screen-repainting when resizing (I still cannot entirely get rid of flicker).
- still more fixes to terminfo & termcap (I corrected my error for the hpa code and added some other stuff by comparing to ncurses' description and rxvt's).
- a tweak to the patch by Michael Rohleder for the color translation
- re-order attribute codes to allow later implementation of protected fields (dtterm supposedly does this; it's probably more useful than blinking or invisible text -- that uses up all of the available bits without changing the attribute scheme radically).

# Patch #17 - 1996/7/2 - XFree86 3.1.2Eb

This patch implements for xterm several minor features from ISO 6429 which are useful for terminfo applications. The HPA and VPA control sequences allow cursor movement along a row or column, cutting down a little on the characters transmitted. The other codes allow resetting specific graphic rendition attributes without modifying the other attributes. (now if someone just had time to implement blinking cursors...)

# Patch #16 - 1996/6/25 - XFree86 3.1.2Ea

Adam Tla/lka <atlka@pg.gda.pl> told me a couple of weeks ago that I'd missed some of the background coloring in xterm. I investigated, and found that while I'd picked up on the clear-to-bottom and clear-to-end-of-line operations, I'd overlooked the insert/delete lines. Just so I wouldn't overlook any more of these, I updated a copy of vttest to test ISO colors and bce (background color erase). This patch introduces a new function, ClearCurBackground, whose calls replace the direct XClearArea calls that I'd overlooked. (There's also a few compiler warnings fixed, etc ;-)

# Patch #15 - 1996/5/29 - XFree86 3.1.2E

This fixes the problem reported by David Dawes, by making the 50msec select timeout for the Xaw3d arrow scrollbar a resource. (I made it a boolean for a variety of reasons -- to make it a number, you'd need an additional resource, to avoid breaking the logic).

# Patch #14 - 1996/5/12 - XFree86 3.1.2Dj

This patch brings the termcap and terminfo descriptions for xterm up to date. I made the following changes:

- reformatted the terminfo description in a single-column (this is ok for terminfo, and will simplify future patches -- can't do that for termcap, since it would impact buffer requirements on some systems).
- omitted obsolete features in termcap to save a little space (bs, pt)
- added color capabilities to termcap (ut, Co, NC, op, AB, AF)
- corrected some capabilities (vi, ve)
- added 'st' (set tab)
- reduced function keys in termcap for 'xterm' to 12 because color capabilities makes that description larger than 1023 characters.
- created new termcap name 'xtermm' (monochrome) to match the terminfo list, and make that description have 20 function keys.
- added corresponding color capabilities to terminfo (bce, colors, pairs, op, ncv, setab, setaf)
- corrected corresponding capabilities in terminfo (civis, cnorm, rmcup, smcup)
- added capabilities (el1, hts)
- in both, corrected home/end keys to match the code correction made by Thomas Mueller in 3.1.2Bk => (I'm still considering modifying the code & description to match the rxvt program).

# Patch #13 - 1996/4/23 - XFree86 3.1.2Df

This corrects my earlier changes for colors - the inner border of the xterm was getting painted with the wrong color, since I'd moved the call to set the background into the logic that tracks SGR information.

# Patch #12 - 1996/3/16 - XFree86 3.1.2Dc

This corrects a memory leak in xterm that happens whenever one switches fonts.

# Patch #11 - 1996/3/5 - XFree86 3.1.2Db

This patch corrects the behavior of the ANSI colors in xterm when reverse video is used, as well as some other lesser sins:

- button.c
  - (compiler warnings: shadowing of 'time', redundant cast)
- charproc.c
  - renamed screen.colors[] array to screen.Acolors[] to more easily distinguish the non-ANSI colors from the ANSI colors.
  - moved logic of SGR_Save() into VTInitialize, getting rid of local private variables original_fg and original_bg.
  - moved some logic into getXtermForeground and getXtermBackground from SGR_Foreground, SGR_Background, etc.
  - corrected misleading 'row' to 'col' in case for CUF, CUB sequences.
- ctlseqs.ms
- xterm.man
  - (correct a misconception which I'd added that the color0 through color6 resource values apply to non-ANSI colors)
- ptyx.h
  - added original_fg, original_bg to TScreen structure.
- scrollbar.c
  - (compiler warnings: redundant cast)
- util.c
  - new functions getXtermForeground and getXtermBackground replace the macros GET_FG and GET_BG, with the added functionality of checking for the reverse-video status of xterm.
  - in ReverseVideo, swap the SGR foreground and background colors also.

# Patch #10 - 1996/2/14 - XFree86 3.1.2Cd

I observed an occasional glitch in the xterm's color behavior; a clear to end of line would get a color that had been used in a program that supposedly reset colors. I traced this down to the way xterm was modifying colors of GC's on the fly; it didn't restore the original color of the GC, even though it would later be used in functions (such as ClearRight) that assumed (my error) that the GC would have the current foreground or background color.

I fixed this by resetting the GC's colors with a new function 'resetXtermGC()', and direct calls on SGR_Foreground/SGR_Background, as appropriate and using a new function 'updatedXtermGC()' to encapsulate the logic that modifies the GC's color. (I also removed some commented-out code that was trying to do this -- the problem was a little more obscure).

# Patch #9 - 1996/2/10 - XFree86 3.1.2Cb

This patch fixes the remaining problems that I had making xterm run with x11r5, as well as a couple of other bugs. It follows my patch from yesterday, that added ifdef's for some of the input-method resources.

- corrected ifdef's that suppress the input-method code (doesn't exist in my x11r5, and xterm works adequately without it).
- corrected fallback definition for 'Select()' macro (oops: I'd copied the wrong text...)
- moved the declarations for the fd_set variables to data.[ch]
- corrected an ifdef in resize.c (sunos 4.x doesn't have termcap.h)
- corrected (in main.c) some unused/orphaned variables.

# Patch #8 - 1996/2/9 - XFree86 3.1.2Cb

This is mostly a documentation patch for xterm. It describes the color control sequences in more detail, and documents some other features of xterm that aren't described elsewhere.

I've also added a couple of ifdef's to fix (part of) the problem that I'm working on (making the program work properly on x11r5, where I'm doing memory testing -- I have a "good" version from mid-January, but my resync version doesn't work properly on x11r5). I'm not done with that yet.

# Patch #7 - 1996/1/28 - XFree86 3.1.2n

I did a (clean) build of 3.1.2n on Linux 1.2.13 (ELF). I've got an S3 card.

This fixes the following in the 3.1.2n xterm:

- initialize cur_foreground, cur_background in charproc.c (Purify told me they weren't initialized).
- add interpretation of codes 39, 49, to reset background and foreground to default value (I'm told that ISO 6429 does this; but I don't have a written reference -- yet -- can anyone help here?). Anyway, rxvt does it, and it'll solve my remaining color management problems.
- shadowing of 'time' in menu.c
- 'Cardinal' vs 'int' in scrollbar.c
- several changes to permit compile with X11R5 (the system that I've got Purify on won't be upgraded to X11R6 for a long time).

I built this version (with a minor nit that I'll patch soon) on SunOS 4.1.3 so that I can test it some more with Purify.

btw: the changes made in Xpoll.h won't work on some older systems, because fd_set isn't a defined type (I've got one machine at least that this applies to).

# Patch #6 - 1996/1/8

This patch does all of the SGR foreground/background fixes (i.e., clearing the screen after an SGR color is set causes that color to be used in the foreground and/or background). If the FG_COLOR and/or BG_COLOR flags aren't set, then the xterm foreground and background default to the window's values. This usage is consistent with various types of hardware (especially the IBM PC), and is also used in rxvt.

- charproc.c:
  - add/use new macros GET_FG, GET_BG - n/c.
  - add/use new functions SGR_Foreground() and SGR_Background() to set corresponding colors in GC's, and to retain sense of "original" colors.

    => This makes redundant some of the corresponding logic in HideCursor to set the foreground and background, but I left it in since it may be fixing an unrelated requirement.

  - set GC's in LoadNewFont() according to whether the SGR fg/bg colors are active.

    => This fixes some glitches in the accompanying resize, that leaves parts of the window in the original background color.

- screen.c:
  - modified ClearBufRows() to use the SGR fg/bg colors if they're set.
  - added function ScrnClearLines(), used this to replace portions of ScrnInsertLine() and ScrnDeleteLine(). The new function uses the SGR fg/bg colors if they're set.

    => Otherwise, selection after an index or reverse index will paint the wrong colors.

  - modified ScrnDeleteChar() and ScrnInsertChar() to use SGR fg/bg colors.
- util.c:
  - modified ClearRight() so that if either of the SGR fg/bg colors is set, we don't bzero the attributes and color arrays, but instead fill them with the appropriate codes.
  - modified ClearLeft to use SGR fg/bg colors.

# Patch #5 - 1996/1/7

This patch modifies the object code, by replacing indexing expressions with temporary variables with the full indexing expression. At first glance, this seems inefficient (it did to me ;-), until remembering comments made in the compilers newsgroups that trying to "help" the compiler doesn't really work that well. A good optimizing compiler can do a better job than the programmer can. (There's a moral in the use of 'register' variables also, but I won't fix those...).

Anyway, the revised code generates a smaller object...

- charproc.c:
  - recode index expressions in ShowCursor() and HideCursor() using SCRN_BUF_xxxxS macros - changes object.
  - replace constant '4' by MAX_PTRS - n/c.
- ptyx.h:
  - defined the SCRN_BUF_xxxxS macros in terms of BUF_xxxxS macros, to pick up references to ScrnBuf data directly, and added MAX_PTRS symbol to pick up those '4' constants strewn about the code - n/c.
- screen.c:
  - recode index expressions in ScreenWrite() using SCRN_BUF_xxxxS macros - changes object.
  - replace constant '4' by MAX_PTRS - n/c.
  - use macros BUF_CHARS, BUF_ATTRS - n/c.
  - cast calloc to 'Char *' to fix compiler warning on IRIX - n/c
- scrollbar.c:
  - replace constant '4' by MAX_PTRS - n/c.
  - cast calloc to 'Char *' to fix compiler warning on IRIX - n/c

# Patch #4 - 1996/1/7

When setting up for this phase, I saw that you'd corrected the bug that I found in ClearLeft. I decided to make this series of patches anyway, since readability never hurt (and there's the potential for finding another bug while reviewing this set).

- button.c:
  - use SCRN_BUF_xxxxS macros - n/c
- charproc.c:
  - use SCRN_BUF_xxxxS macros - n/c
- ptyx.h:
  - added four macros: SCRN_BUF_CHARS, SCRN_BUF_ATTRS, SCRN_BUF_FORES, SCRN_BUF_BACKS to represent the four arrays that are derived from screen->buf.
- screen.c:
  - use SCRN_BUF_xxxxS macros - n/c
- util.c:
  - use SCRN_BUF_xxxxS macros - n/c

# Patch #3 - 1996/1/7

This is my third (and final cleanup) patch for xterm. It gets rid of the unused stuff, and converts several functions to static (thereby reducing their scope).

At this point, the only compile warnings I've got (on Linux) are those about the select arguments (int vs fd_set type), and a missing declaration for waitpid. Those both are hard to get right without autoconfigure.

The next patches will address the functional changes...

- Tekproc.c:
  - changed several functions to 'static' that aren't used outside this module -- changes object
- charproc.c:
  - changed several functions to 'static' that aren't used outside this module -- changes object
  - deleted unused function unparsefputs -- changes object.
- main.c:
  - changed several functions to 'static' that aren't used outside this module -- changes object
  - ifdef'd out unused function 'consolepr()' -- changes object
  - removed unused variable 'dummy_tio' -- changes object
  - moved variable 'discipline' to quiet unused-warning -- changes object
- main.h:
  - deleted unused definition of DEFBORDERWIDTH - n/c
- misc.c:
  - changed several functions to 'static' that aren't used outside this module -- changes object
  - provide dummy return statements for xerror and xioerror to quiet compiler warnings -- changes object
- ptyx.h:
  - change sbuf_address and abuf_address to 'Char *' - n/c
- resize.c:
  - changed several functions to 'static' that aren't used outside this module -- changes object
- screen.c:
  - remove unnecessary 'Char **' casts - n/c
- util.c:
  - changed several functions to 'static' that aren't used outside this module -- changes object

# Patch #2 - 1996/1/7

This is my second patch to xterm. It corrects most of the gcc warnings (except for some that are due to X header files ;-). I compared objects to keep track of the changes that don't affect the object code (n/c) versus those that do.

At this point, I'm compiling (fairly) clean with gcc options

    	-Wall -Wstrict-prototypes -Wmissing-prototypes -Wshadow -Wnested-externs

(I also compiled with -Wshadow, but while that found some things that I wanted to find, there's far too many warnings from the X headers to be usable in this context).

The changes:

- Tekproc.c:
  - parenthesized expression to avoid gcc warning -- n/c.
  - corrected nested-extern declaration for Bool waiting_for_initial_map; ourTopLevelShellArgs, and number_ourTopLevelShellArgs - n/c
- charproc.c:
  - corrected potentially-unintialized variables 'scstype', 'xim', and 'input_style' -- changes object.
  - adjusted logic of VTparse so that gcc won't warn about setjmp clobbering parsestate -- changes object.
  - corrected initialization of 'scstype', which could have been clobbered by setjmp/longjmp - changes object.
  - corrected nested-extern declaration of 'term', 'ProgramName' - n/c
- cursor.c:
  - corrected nested-extern declaration of 'term' -- n/c
  - renamed 'term' parameters to avoid gcc -Wshadow warning - n/c
- input.c:
  - change interface of StringInput to assume size_t (i.e., unsigned) nbytes -- changes object.
  - change interface of funcvalue, and sunfuncvalue to use 'KeySym' type instead of 'int' - changes object.
- main.c:
  - moved definitions of SIGNAL_T, SIGNAL_RETURN to proto.h - n/c
  - corrected missing params of 'do_hangup()' -- changes object (note: the missing params were not used).
  - corrected missing param of 'Error()' -- changes object
  - corrected nested-extern 'environ' - n/c
  - adjusted assignments to 'tty_got_hung' and 'no_dev_tty' so that gcc can see they won't be clobbered by the longjmp - changes object.
  - use Size_t type - n/c.
- menu.c:
  - removed redundant prototype for 'do_hangup()' -- n/c.
  - renamed 'time' parameters to avoid gcc -Wshadow warning - n/c
- menu.h:
  - renamed 'time' parameters to avoid gcc -Wshadow warning - n/c
- misc.c:
  - corrected definition of 'HandleFocusChange()' -- changes object
  - cast parameters in call to 'TekExpose()' -- n/c
  - corrected nested-extern declarations of 'term', 'toplevel', ProgramName, and 'environ' -- n/c.
  - use Size_t type - n/c.
- proto.h:
  - moved definition of SIGNAL_T (and SIGNAL_RETURN) here from main.c, resize.c to allow use of this symbol in prototypes (mostly in xterm.h).
  - added definition 'Size_t' to use as corrected type for strncpy, malloc sizes - n/c.
- resize.c:
  - moved SIGNAL_T definition to proto.h -- n/c.
  - use Size_t type - n/c.
- screen.c:
  - use Size_t type - n/c.
- tabs.c:
  - corrected nested-extern declaration of 'term' -- n/c
- util.c:
  - corrected/supplied parameters to 'TekExpose()' -- changes object (note: 'TekExpose()' doesn't use its parameters).
  - corrected nested-extern declaration of 'waiting_for_initial_map' -- n/c.
  - renamed 'term' parameters to avoid gcc -Wshadow warning - n/c
- xterm.h:
  - prototype 'do_hangup()', 'HandleFocusChange()', 'TekExpose()', 'Error()', 'Exit()' - forces changes in various places.
  - adjusted prototypes that pass 'Boolean' arguments to use 'int' (this is the "correct" ANSI approach to extended compiles; it's worth mentioning that gcc doesn't meet the ANSI spec here). I used gcc -Wconversion to find these, but there's a lot of unrelated warnings that are due to setting NARROWPROTO in the config - n/c.
  - renamed 'term' parameters to avoid gcc -Wshadow warning - n/c

# Patch #1 - 1996/1/6

This is my first cleanup patch for xterm. It addresses all of the gcc warnings for -Wall, -Wmissing-prototypes and -Wstrict-prototypes that I can change without modifying the object code. (I'm compiling this with gcc 2.7.0 for an aout target, which makes it simple to compare objects. When I do ELF-only, I've got a tool that compares that sort of thing as well).

Briefly, this patch adds (and uses) two header files in the xterm directory:

    	proto.h
    	xterm.h

I expect this to be the biggest patch by far. However (barring a misplaced prototype), it shouldn't break anything, since the intent of the patch is to provide missing declarations.