ckc192.upd

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ck[9dlmsuv]tio.c, 9 Dec 93.  (OS/2 and Amiga Kermit were already OK.)

Added a new command-line option, -R (uppercase).  It is tied to a new IF
command, IF REMOTE-ONLY.  This allows us to skip all the local-mode setups
in the initialization files if we don't intend to use C-Kermit in local mode.
ckuusr.h, ckuus6.c, ckuusy.c, ckuus2.c, ckuus4.c.  Also, in making this
change, I discovered that prescan() did not handle bundled arguments
correctly; fixed in ckuus4.c.  ckuusr.c 5A(115), 9 Dec 93.

Edited the standard initialization file, CKERMIT.INI, to skip dial and
services directory setups if the -R command-line option given.  This makes
C-Kermit startup WAY faster.  Ditto for CKERMOD.INI.  9 Dec 93.

Fixed another bug discovered by Bo Kullmar, namely that the automatic
re-mallocation of the debug-log string buffer could make C-Kermit core dump
under certain circumstances.  I flushed this code and used sprintf() formats
to cut off the strings to fit in the buffer.  No more core dumps.  ckuusx.c,
9 Dec 93.

Michael Godfrey noticed that if a SET LINE command has been given (to open a
serial line), a subsequent TELNET command, given without a hostname/address,
acts like a CONNECT command on the serial line.  In OS/2 C-Kermit, which
starts up using COM1 by default, this usually gives a message like "No carrier
detected", which is not exactly what we want to say.  Now it gives an
appropriate error message.  ckuus7.c, 9 Dec 93.

Backed off on yesterday's debug-log change because it turns out sprintf()
field-width formats aren't portable after all.  Yesterday's change totally
broke debug logging on VMS.  Now we just decline to log any string that's
too big for the buffer.  ckuusx.c, 10 Dec 93.

One of the biggest problems with VMS C-Kermit was that it could not send
packets longer than MAXBUF (a SYSGEN parameter), nor longer than any of
various user quotas, such as BYTLM.  Attempts to do this resulted in SYS$QIOW
failing with error 28, Quota Exceeded (as finally revealed by the new and
improved debug log).  The low-level packet writer in VMS C-Kermit, ttol(), has
now been recoded to handle these errors more or (mostly) less gracefully: if a
write attempt fails with error 28, we chop the data in half and try again,
repeating until the write succeeds or the length goes below 70, at which point
we fail.  If the write succeeds, we remember the size for next time, so all
subsequent writes use it and bypass the trial-and-error rigamarole.  The
impact on performance is hardly noticeable, e.g. when sending 9000-byte
packets with MAXBUF = 2064.  So now we no longer have to tell VMS sites to
reconfigure and reboot their systems to solve this problem (though it is still
a good idea to have sufficient MAXBUF and BYTLM on systems where file transfer
is a commonplace activity).  Too see the new code in action, have VMS C-Kermit
send a file using 9K packets, with its debug log active, preferably on a
system with a small MAXBUF.  Then "search debug.log ttol" to see what happened
internally.  The packet sizes are not optimal: This could be achieved using a
binary-search trial-and-error technique, but it's not worth it -- the
performance difference is negligible.  CKVTIO.C 5A(067), 15 Dec 93.

Catch and ignore SIGDANGER in sysinit().  Suggested by Marc Pawliger,
<[e-mail]>.  This code is enabled if SIGDANGER is defined.  As far as I
know, this holds true only on RS/6000 AIX.  The new code prevents C-Kermit
from being killed by AIX's swap-space police, except as a final resort.
ckutio.c 5A(120), 17 Dec 93.

The VMS version was not releasing the OPEN READ file descriptor, so successive
OPEN READ commands could use them up and then no further files could be
opened.  Noticed by Carl Friedburg, fixed by Terry Kennedy, ckvtio.c 5A(106),
22 Dec 93.

ESC/Tab keyword completion of R into RECEIVE did not work (as C does for
CONNECT and S for SEND).  Noticed and fixed by Mike Freeman
<[e-mail]>, ckuusr.c, 27 Dec 93.

Added APC support to OS/2 C-Kermit's terminal emulator, and made various fixes
and speedups to it also.  ckocon.c 5A(107), ckuus4.c, 29 Dec 93.

Added SET TERMINAL APC { ON, OFF, UNCHECKED } to control execution of APC
commands received by C-Kermit.  Conditionalized all APC-execution-related code
under CK_APC, so it can easily be activated for the Macintosh too, or any
other C-Kermit implementation that has a built-in terminal emulator.  I might
even consider adding it to the UNIX and VMS versions, but for now, this
feature is activated only in the OS/2 version.
ckuus[r23457].c, ckuusr.h, 30 Dec 93.

Added automatic parity detection and DDK to OS/2 version.  This was done by
adapting UNIX ttinl() to OS/2, which is not the optimal solution.  My original
plan was to restructure the system-independent packet-reader, rpack(), to take
over the many functions that have been improperly delegated to ttinl() and, in
fact, to retire ttinl() altogether.  But this will be a much bigger job than
it seemed, because of the many and diverse ways in which the various ttinl()
versions handle timed reads, blocking vs nonblocking reads, buffering, etc.
We no longer allow the device driver to handle parity; like all other Kermit
programs, OS/2 C-Kermit now does this itself.  In particular, the ttsettings()
routine always sets no parity, 8 data bits.  ckotio.c, 5A(111) 30 Dec 93.

In adding parity detection to the OS/2 version, I discovered that it often
failed because, when looking at the packet control fields, it neglected to
strip the parity bit first, thus misinterpreting (in particular) the packet
length fields.  I migrated this fix into the UNIX, VMS, AOS/VS, and Stratus
versions.   ck[uvodl]tio.c, 31 Dec 93.

When using OS/2 C-Kermit's VT102 emulator with UNIX 'more', I discovered that
lines that were wrapped around the "more?" prompt caused the inverse video of
the "more?" prompt to extend to the right margin, but only when this occurred
at the bottom of the screen, i.e. when scrolling a wrapped line.  Experiments
showed this happening whenever scrolling any wrapped line that had nondefault
video attributes.  Diagnosis: the scroll() routine was creating the new bottom
line using the current attributes.  Cure: the scroll routine should use the
normal, default attributes to create the new bottom line, and then let
subsequent character-writing operations take care of the attributes.
ckocon.c, 5A(108) 4 Jan 94.

Added a new UNIX makefile entry for Amdahl UTSV with TCP/IP support, from
Gerald J. Werner, Marshfield Clinic <[e-mail]>.  5 Jan 94.

Installed new Stratus VOS modules: ckltio.c, cklfio.c, cklnet.c.  From David
Lane <[e-mail]>, 5 Jan 94.

Added print / dump screen to OS/2 C-Kermit.  Works in both the 32-bit and the
16-bit version.  Activate during CONNECT mode via Alt-P (or Alt-p), or by
<Escape-character>F/f as in MS-DOS Kermit.  Also had to add special code to
make it work for rolled-back screens.  Entries added to the two CONNECT-mode
help screens.  ckocon.c 5A(109), 6 Jan 94.

Fixed a screen-rollback bug in OS/2 C-Kermit, which occurred when a wrapped
line scrolled off the screen; the wrapped portion was not saved in the
rollback buffer.  The same thing happened with Index (ESC D); that's fixed
too.  ckocon.c 5A(109), 6 Jan 94.

Added TELNET NAWS (Negotiate About Window Size, RFC 1073) to the UNIX and OS/2
versions.  This feature is configured only if the program is built with the
CK_NAWS symbol defined.  Requires new system-dependent support routine,
ttgwsiz(), described in ckcplm.doc.  In UNIX C-Kermit, NAWS works only if the
TIOCGWINSZ symbol is defined and the corresponding ioctl is available and
executes without error.  Defined CK_NAWS by default for SunOS 4.1, NeXT,
System V R4, 4.4BSD, and OSF/1.  Override these default assignments by
including -DNONAWS on the CC command line.  I don't see how to do it for POSIX
or others, but people are encouraged to send in code to make it work for more
systems, or to confirm that it works safely on systems not yet included.
Note: Don't define CK_NAWS unless there is also a ttgwsiz() routine.
ckcnet.[ch], ckutio.c, ckocon.c, etc, 12 Jan 93.

Now that we know how to get the rows and colums of the controlling terminal,
we can change the various "more?"-prompting items to use the actual screen
length.  This includes the HELP command, SHOW MACROS, SHOW VARIABLES, etc.
ckuus[25].c, 12 Jan 93.  Later, this can also be extended to the file transfer
display screen and the command parser keyword and file menus.

Added SIGWINCH trapping for the UNIX version.  If you're running C-Kermit in a
window and you change the window size, UNIX delivers a SIGWINCH signal.
C-Kermit now catches this signal, asks UNIX what its new window size is, and
if a TELNET connection is open (and we have received permission to send NAWS
reports) we send a NAWS report.  Tested in NeXT Terminal window by stretching
the window during C-Kermit CONNECT mode, seemed to work fine for a while, but
then started to fall apart -- it seemed to interfere with some of the other
TELNET negotiations, like echoing.  But only when TELNET'ing from NeXT to
NeXT.  Removing the SIGWINCH code didn't make any difference.

Hmmm...  It seems the problem with the NeXT has nothing to do with NAWS.  Even
versions 188 and 189 had a similar problem, namely that the SIGUSR2 signal
which we use during CONNECT mode to let the lower fork tell the upper fork
about TELNET-negotiated echoing changes does not get delivered immediately,
and sometimes gets lost.  The reason the problem is only noticeable when going
from NeXT to NeXT is that the NeXT TELNET server sends many echoing changes,
rapid fire, and only the NeXT client is exhibiting the signal-delivery
sluggishness.

(Well, I spent two days on this one and could not solve it.  Then I discovered
that if I ran Kermit in a Stuart window rather than a Terminal window on the
NeXT, it worked perfectly.  It also works fine if I TELNET to the NeXT and
start Kermit in a TELNET session -- i.e. not in any kind of NeXT window.)

(This note inserted Aug 13, 1994: The changes that were made to the CONNECT
fork signalling in July-August 1994 have cleared all of this up, and now
C-Kermit can be used under Terminal just as well as under Stuart.)

Added CK_NAWS to VMS version.  Code for ttgwsiz() supplied by Mark Berryman
at SAIC.  CKVTIO.C 5A(069) 14 Jan 94.

Fixed a bug in the VMS version that I introduced when I moved the tn_ini()
call to be inside netopen(), which resulted in initial TELNET negotiations
never being sent.  ckcnet.c 5A(025) 14 Jan 94.

Added NOSIGWINCH symbol to allow SIGWINCH trapping be disabled without
disabling the NAWS feature itself.  ckccfg.doc, ckcnet.c, 14 Jan 94.

Fixed some dependencies in the UNIX makefile.  14 Jan 94.

Added NODISPO symbol to allow C-Kermit to be built to always refuse incoming
MAIL and REMOTE PRINT files.  ckcfn3.c, 14 Jan 94.

Jeff Altman <[e-mail]> noticed that sequences of bold characters
would alternate between bold and regular.  The fix turned out to be rather
complicated, since it had to work for both normal and reverse-video screens,
and in working on this I discovered that the handling of DECSCNM, ESC [ ? 5
h/l, reverse-video/normal screen (i.e. the one that flips your entire current
screen between normal and reverse video), was totally broken.  Previously, it
would (a) only affect the rightmost 1/4 of an 80-column screen, and (b) it
wasn't "sticky" -- i.e. subsequently received characters would be displayed in
the opposite mode.  Much code was rewritten and tested successfully, and it
now works independently of your screen colors, etc.  ckocon.c 5A(112),
15 Jan 94.

Added additional printing capabilities to OS/2 C-Kermit's terminal emulator
via host-generated escape sequences.  All these are only for the 32-bit
version, since the 16-bit version crashes with a stack overflow if they are
used.  For the VT102 emulator:
 . ESC [ 0 i, print current screen (also ESC [ i).
 . ESC [ ? 1 i, print current line (i.e. the line where the cursor is).
 . ESC [ ? 19 h/l, select print extent (h = full screen, l = scrolling region).
   This applies when ESC [ 0 i or ESC [ i is received.

And for the VT52 emulator:
 . ESC V, print current line.
 . ESC ], print current screen.
 . ESC W, turn on transparent printing.
 . ESC X, turn off transparent printing.
 . ESC ^, autoprint on (treated like transparent print).
 . ESC _, autoprint off (treated like transparent print).

Implemented SRM (Send/Receive Mode), for host-controlled remote/local echo
in the VT102 emulator, ESC [ 12 h/l (h = remote echo, l = local echo).

Fixed VT52 reverse index.

Fixed an oversight in the new APC code, namely that if an APC, OSC, or similar
string-bearing escape sequence starts to arrive but never finishes, there was
no way to break the deadlock.  Now "reset terminal" (Alt-=) does it.

Restored host-directed switching between US and UK sets in VT102 emulation,
but ONLY if the terminal character-set is ASCII.  All other character-set
selections must be made by the user, via SET TERMINAL CHARACTER-SET.  That's
because this is a VT102, not a VT220 or higher, which allows the host to
control character-set designation and invocation.  ckocon.c 5A(112) 15 Jan 94.

After discussions with Jeffrey Altman about OS/2 C-Kermit, added a new
feature: SET { SEND, RECEIVE } PATHNAMES { ON, OFF }.  This applies to the
handling of filenames when SET FILE NAMES LITERAL is in effect.  SET SEND
PATHNAMES ON means to leave pathnames on outbound file names, which is the
default for compatibility with earlier behavior.  OFF means to strip path
inf