CKUV4F.UPD

This file contains the edit history of C-Kermit version 4F, April 1989 through
August 1989.  Version 4F was never formally released, but became the basis for
version 5A.

4F(095) Thu Aug 31 20:04:59 1989

Fix a bug which has been in ckucmd.c forever -- can't believe nobody ever
noticed it before!  If cmnum() is called as the last field in a command, and
it is supplied a default value, and the user types carriage return instead of
a number, then the default was not supplied.  The fix was in cmfld(), to
copy the default into the atom buffer, rather than just pointing to it.  This
fixes the problem with the transmit command not waiting for the echoed
linefeed when the user types "transmit foo.bar" and does not supply the final
field, the turnaround character, which was supposed to be linefeed (10) by
default.  Also, fix transmit so it echoes right on both full and half duplex
connections.

Addition of support for a variety of AT&T modems in ckudia.c, from Eric F.
Jones at AT&T, including the 2212C, 2224B, 2224CEO, and 2296A (should also
work with 2224G and 2248A, but not tested).  Also the AT&T Digital Terminal
Data Module (DTDM) found in the telephones connected to the AT&T System 85
digital PBX.

In ckutio.c: (a) for AT&T-based systems, modify tthang() to not wait for
carrier when reopening the device, (b) don't attempt to use the TIOCSINUSE
ioctl() unless TIOCSINUSE is a defined symbol.

Several minor cosmetic changes for the benefit of VMS.

4F(094) Sat Aug 19 18:29:14 1989

C-Kermit fails to write out one or more output file buffers on the AT&T
3B2/300, but works OK on all other systems tested, including other AT&T
systems.  Added bullet-proofing and debugging to zmchout() in ckufio.c,
and in ckcpro.w, checked decode()'s return code and cancelled the protocol
transaction upon decode() failure.  Also, commented out a trailing token
after an #endif in ckuusr.c.

4F(093) Wed Aug 16 22:22:05 1989

Many places ckudia.c, ckucon.c, ckuscr.c, and ckutio.c -- change the type
of functions that are passed as arguments to signal() to SIGTYP rather than
no type at all (i.e. int).  This should prevent many compiler warnings and
maybe even some runtime problems?

In ckcfns.c, fix the file counting (ffc++) so that correct(er) file sizes are
reported by 'statistics'.

4F(092) Fri Aug 11 15:06:39 1989

Add code for converting file time to seconds since Jan 1, 1970 GMT.
Not used yet, but will be used in setting Unix file date from incoming
file attributes.  From David MacKenzie and Michael Haertel.  (This code is
enclosed in #ifdef NOY_YET brackets, because it causes numerous compile &
link time errors on certain systems).

Rename memcpy() replacement in ckudia.c to xcpy(), to eliminate core dumps
that the memcpy replacement caused on the ATT7300 and perhaps other systems.
Peter Mauzey, AT&T.

makefile addition for ATT6300, Peter Mauzey, AT&T.  makefile addition for
Convex, Peter Mossel, Columbia Univ Health Sciences.

4F(091) Sat Aug  5 14:29:41 1989

Fix send-packet size recalculation to not respond to spurious errors like
timout-retransmission of initial S-packet.

Reorganize code that responds to MAIL and REMOTE PRINT commands so that it's
in the system-dependent module, ckufio.c.  This will require adding zmail()
and zprint() functions to all other ck*fio.c modules.

Make a couple small changes to ckotio.c for OS/2, and in ckuusr.c also include
signal.h and setjmp.h for OS/2 (Rob Kedoin, blessed by Chris Adie).

4F(090) Fri Jul 28 20:08:52 1989

Fixes from Bob Larson:
Remove duplicate call to sysinit() from ckcmai.c.
Don't call strlen() on a constant in a loop (tilde_expand(), ckufio.c).
A couple OS-9 specific changes.

Put definition of memcpy() function into ckudia.c, because it is not available
to certain C compilers (used in Microcom modem support).

Attempt to make the Apollo SR10-BSD version compile correctly:
Change all "#ifdef apollo" back to "#ifdef aegis", and remove -Uapollo
from the sr10-bsd makefile entry.  This way, "apollo" is still defined,
which it apparently needs to be when #include'ing <stdio.h>, otherwise
there are horrible compiler errors regarding _bufsiz, etc.

4F(089) Thu Jul 20 19:59:25 1989

OS-9/68K support from Bob Larson, USC.  The main difference between OS-9 and
Unix (from Kermit's point of view) is that the OS-9 file system uses CR as
a line terminator, rather than LF.  The OS-9 specific modules are ck9con.c,
ck9fio.c, and ck9tio.c

Other modules had "#ifdef OSK"..."#endif" conditionals added: ckuus*.*,
ckcmai.c, ckcdeb.h, ckucmd.c, mainly having to do with \r, \n differences
between OS-9 and Unix.

Bob also found and corrected a lot of mistakes in the command parser --
extraneous dereferencing of pointers, misgrouped parentheses in numerous calls
to cmcfm(), etc.

Bob also replaced Jim Knutson's Microcom modem support in ckudia.c with 
a different style of support for this modem.  As Bob says, "the two
versions make very different assumptions on how the modem will be configured
and used.  Mine assumes the modem is configured for reasonable interactive
use, and will try the autobaud sequence if the modem doens't respond to
a return.  The other one forces the configuration into modes that may be
slightly easier for a computer to understand, but make it hard to use
interactively."  Note, Bob makes extensive use of memcpy().  I hope that all
the systems that use ckudia.c support this function!

Also in ckudia.c, add support for additional responses from Hayes-like
modems: NO DIALTONE, BUSY, NO ANSWER, RING, ERROR.  From Bo Kullmar, Kista,
Sweden.

Also in ckudia.c, add a couple sleep(1)'s for Rolm CBX dialing.  This made
it work, finally (at least here at Columbia).

In ckutio.c, function tthang(), remove the closing and reopening of the tty
for BSD42.  It doesn't seem to be necessary.

In ckufio.c, add a little bullet-proofing to zsout() and zopeno(), to prevent
the case where you could crash the program by typing the command "log debug"
twice in a row.

Fix the TRANSMIT command to be interruptible by Ctrl-C, by getting rid of
longjmp, which apparently leaves you executing on the wrong stack.  Live and
learn...  Put all references to signal handling in the TRANSMIT command
(ckuusr.c) within #ifndef OS2...#endif conditionals.

Make the "size" message on incoming files in local mode less space consuming,
and put a space between it and the "A".

From Bo Kullmar in Sweden, fix ckucon.c not to give "Can't get character"
message if myread() returned its special error 9999.

4F(088) Wed Jul 19 20:54:06 1989

These releases are flying thick and fast!  This one has fixed-up support for
Masscomp/Concurrent RTU, plus a couple minor cosmetic improvements from
Farrel Woods, ftw@westford.ccur.com (Concurrent, formerly Masscomp):

The first is to get around a bug/inconsistancy in RTU signal handling in the
Berkeley environment.  It turns out that if a user handles a signal (SIGTSTP),
then any pending system call will return with EINTR when the program is
resumed. This caused Kermit to exit after being resumed, since our library
(e.g., getchar) will not re-try the system call.  Subsequent reads (and,
getchars) will work alright.  The fix is set a flag before sending SIGSTOP to
ourselves, and upon resumption, do an extra getchar if the flag was set.
(yuck).

Masscomp/Concurrent was added to the herald.

The flag for the first bug was located in ckutio.c.  It seemed to be
the place to put those kind of globals...

RTU as of version 4 uses Honey Dan Ber (sic?) uucp.  The lock files
live in /usr/spool/locks.

Upon resuming after being suspended, call prompt() if not in background mode
so that you know Kermit is paying attention to you again.

The Makefile was changed to build Kermit in the ucb universe, with the
BSD42 flag turned on.

4F(087) Wed Jul 19 11:35:09 1989

Hmmm....  A month ago, I merged in all of Chris Adie's OS/2 conditionals,
and now all of that has disappeared!  I can't explain it.  Maybe there was a
disk crash and the previous copies of the files were restored on top of the
new ones?  Sigh...  Anyway, I did it again.  New copies of: ckcmai.c,
ckucmd.c, ckudia.c, ckuscr.c, ckuusr.c, ckuus2.c, and ckuus3.c.

4F(086) Tue Jul 18 11:52:16 1989 

Add missing #ifdef OS2's to ckcdeb.h and ckuusr.h.  Forgot these before, oops.

Change definition of tlog() and debug() when not defined to be the null
string, instead of {}, to prevent problems with semicolons in if-else
constructs (Steve Walton, Cal State Northridge).

In ckutio.c, function ttopen(), also put local line in no-echo mode for
ATT Sys III/V, as is done for BSD (David MacKenzie, Environmental Defense
Fund, Rockefeller Univ).

Major problems compiling on Apollo SR10 involving use of getchar() in
ckucmd.c with "make sr10-bsd", reported & not yet fixed.

4F(085) Fri Jul 14 13:19:00 1989

ckcfns.c: In opena(), save global file mode (i.e. transfer syntax, variable
"binary") in variable "bsave".  Check incoming file type attribute ("), if
any.  If text (A), set transfer syntax to binary for this file only.  If
binary (B), set to binary for this file only.  In clsof(), restore global file
mode from bsave.  This allows the sender to tell the C-Kermit receiver whether
the file is being transferred in text or file mode, so that you don't have to
type a "set file type { text, binary }" command on the C-Kermit receiver.
This code has no effect if the sender does not send the file-type attribute,
or if the C-Kermit receiver has "set attributes off".

4F(084) Mon Jul 10 20:47:51 1989

Get rid of index() function in tilde_expand(), ckufio.c.  Some systems don't
have it (like Xenix).

Fix directory command to allow ~name, and ~name/, as well as ~name/file.

Install missing help message for "set incomplete" and "set terminal".

4F(083) Wed Jul  5 12:09:50 1989

Add support for RT PC AIX 2.2 to ckutio (mostly lockfile stuff) and makefile,
from Ge van Geldorp, Netherlands).

Minor fixes to Zilog Zeus support from John R. Evans, IRS, Kansas City.

4F(082) Mon Jul  3 15:19:22 1989

Don't try to output to debug log in cmdini() in ckuusr.c, because it's not
open yet (Martin Maclaren, Bath Univ, UK).

Allow cd/cwd to also accept tilde notation (for user's home directory) in
pathnames.  Required the addition of a new parsing function, cmdir(), to
ckucmd.c.  Hacked it in as quickly as possible, mostly by killing stuff from a
copy of cmifi().  Seems to work for SUNOS and Ultrix.  Hope it doesn't break
all the other versions...

Add tilde expansion to cwd() function in ckcfns.c, so that server can also
expand tildes in 'remote cwd' commands.  Also add tilde expansion in sinit()
when C-Kermit server executes the 'get' command.  Also in rcvfil() so it can
receive files into directories specified in tilde-notation.

Add tilde expansion to System-V based versions too.  Code for ckucmd.c from
Dave MacKenzie at Rockefeller U.  Those who have experience with other kinds
of systems (V7, Sys III, etc) should look at this code.  Should be simple to
get it working for any Unix variant.  See #ifdef DTILDE.

Move tilde-expansion code from ckucmd.c to ckufio.c.  Tilde-expansion code
is compiled based on existence of TILDE symbol, which is defined in ckcdeb.h.

Enable sending file timestamps from System V.  Code for ckufio.c from Dave
MacKenzie.  See #ifdef TIMESTAMP.

Clear up some packet-length confusion in pwp's new sdahead() encode-ahead
function, in ckcfns.c.  Previously, C-Kermit was sending slightly-longer-
than-negotiated packets.

Fix pwp's modification to zopeni() in ckufio.c.  File input buffer was not
being reset in all cases, resulting in leftover text from a previous transfer
being prepended to the next transfer.

Add "make next" to makefile, Mic Kaczmarczik, UT Austin Computation Center


4F(081) Thu Jun 22 12:26:04 1989

Add makefile entry for Berkely Unix 4.x with HoneyDanBer UUCP and clean up
lock-file selection conditionals and code in ckutio.c (Paul Placeway),.

From David MacKenzie, a couple small patches to make ckutio.c compile
correctly on recent versions of UNOS.

4F(080) Mon Jun 19 20:51:41 1989

Merge in changes from Chris Adie, Edinburgh University, Scotland, for OS/2
support:

 - New OS/2-specific modules:
     ckocon.c (terminal emulation), ckofio.c, ckutio.c.

 - Minor changes to the following files under #ifdef OS2 conditionals:
     ckcdeb.h, ckucmd.h, ckuusr.h, ckcmai.c, ckucmd.c, ckudia.c, ckuscr.c,
     ckuusr.c, ckuus2.c, ckuus3.c.

 - Add new material to Chris's ckofio.c OS/2 file-system support module:
     Limited file attribute support.
     Paul Placeway's buffered file input and output.

Chris Adie's work was based on an older C-Kermit, and so this two-way merge
was unavoidable.  The result is entirely untested and may not work at all, so
those with OS/2 development systems are urged to debug it and send back the
necessary fixes.

Change the interactive command parser, for BSD4.x only, to expand tildes in
filenames in SEND, RECEIVE, DIRECTORY, LOG, and similar commands.  This code
is all in ckucmd.c, under #ifdef BSD4 conditionals, in the cmifi() and cmofi()
functions.  AT&T UNIX users are invited to adapt it to System III, System V,
etc.

Add file creation date to attributes sent by C-Kermit (BSD 4.x only).

Change input() function in ckcfn2.c to avoid getting into retransmission loops
when it receives an ACK for the previous packet or a NAK for the next packet.

Restore lost comment delimiter in ckcpro.w, on "<serve>I" line, which
prevented type-2 or -3 block checks from being selected by the client.

Remove something that was added in 4F(077), i.e. using file descriptor for the
terminal in packet mode.  It turns out that this prevented Kermit from
sending/receiving files to/from standard input.

Changes for 4.1 BSD from Frank Prindle:
Make setegid() and seteuid() calls in ckuusr.c and ckufio.c conditional
upon BSD42, rather than BSD4, because 4.1 BSD doesn't support them.  In
file ckutio.c, tthang() shouldn't close and open the ttyfd, and ttpkt()
should choose the "old" line discipline.  Add special BSD41 entry in
makefile.

Another one from Frank Prindle: When assigning an external line for local-mode
operation, turn off ECHO bit in sg_flags.  This eliminates the problem of
bizzare delayed echoing when connecting back to a remote system after a file
transfer, which first appeared in 4E(072).  For the benefit of those still
running versions between then and now, the fix is to find the following lines
in function ttopen() in the file ckutio.c:

#ifndef UXIII
    gtty(ttyfd,&ttold);                 /* Get sgtty info */

and add the following line immediately after them:

    if (xlocal) ttold.sg_flags &= ~ECHO; /* Turn off echo on local line */

In ckucmd.c, change the name of the function digits() to rdigits(), because
digits is now apparently a reserved word on some systems, like NEC Astra XL
3.4 (Gary Holbrook).

Try to fix the hangup code.  In ckutio.c, function tthang(), where we close
and reopen the line, if the reopen fails, kill the lock file.  Add message,
"[hanging up]".  In ckucon.c, fix ^\h escape (hangup) in connect mode to wait
until tty port reader fork terminates.  Add ^\q escape (hangup and quit from
Kermit).  All this from Patrick Wolfe, Kuck & Associates, Inc, pat@kai.com.

"mail" has been changed to "Mail" to ensure that the Berkeley version will
be used, which accepts a "-s" switch on the command line for subject.

Add support for Microcom ax9624 modem from Jim Knutson in ckudia.c.

Remove #include <sys/file.h> for Apollo aegis in ckutio.c (Martin Maclaren).


4F(079)

Add 'transmit' command for raw uploading.  For now, there's no way to
interrupt it.

4F(078)

Changes by Paul Placeway, Ohio State University, to speed up decoding of
Kermit packets and writing out to files.  Also code from Paul to dynamically
size outbound packets based on the frequency of retransmissions - the noisier
the line, the shorter the packets, the cleaner the line, the longer the
packets (up to the maximum negotiated length).

C-KERMIT FOR UNIX, CHANGES FROM VERSION 4E(072) TO 4F(077), 1 Apr 89

A somewhat major new release, in beta-test form (but if it tests ok,
it can become a real release without requiring any further changes).

ATTRIBUTE PACKETS.  Minimal support for attribute packets added: ckcpro.w,
ckcdeb.h, ckcfn2.c, ckufio.c, ckuus*.c.  C-Kermit can send Attribute packets
containing system ID, file sizes (K and bytes), and encoding method (text or
binary), and will honor positive and negative responses.  It will also receive
Attribute packets (see below).  In the ckuus* modules, the command 'set
attributes {on, off}' was added, to allow Attribute packet processing to be
disabled in case of misunderstandings; it is enabled by default.

IMPORTANT: ckcpro.w calls a new function, sattr(), which is defined in
ckcfn2.c.  The sattr() function, in turn, calls zsattr(), which MUST BE
DEFINED in in each and every ck?fio.c module.  So far, it has only been
defined in ckufio.c, for Unix.  Macintosh and VMS Kermit developers -- be sure
to add this function to your system-dependent code.  In the future, a similar
function will have to be added to ck?fio.c to modify an incoming file's
attributes.

C-Kermit receives and processes attribute packets, and fills in an attribute
structure.  So far, C-Kermit does nothing with these attributes except for
"Disposition" (Attribute "+").  If the disposition is M, then the file is
mailed to the designated address(es).  If the disposition is P, then the file
is printed with the specified options.  These operations are currently done
in the crudest possible way (via "system()"), and only for UNIX.

EFFICIENCY: Modifications from Paul Placeway at Ohio Statue University that
dramatically speed up C-Kermit when sending.  Changes as follows:
 ckcker.h - define a file input macro similar to getc(), and a buffer size.
 ckufio.c - function zinfill() added to fill input buffer, zchin() modified
            to use buffered input.  NOTE: zinfill() will have to be added to
            all the other ck?fio.c modules (Macintosh, VMS, etc etc).
 ckcfns.c - getpkt() totally rewritten and demodularized.  It used to be
            pretty, but now it's fast.  getchx() and encode() copied inline.

The SET SERVER TIMEOUT command was added to control the rate at which the
C-Kermit server issues NAKs during server command wait, 0 = no NAKs at all.
Changes to ckuus*.c, ckuusr.h, ckcfns.c, ckcmai.c.  The server's periodic NAKs
can interfere with originate/answer devices like digital PBXs or autodial
modems, putting them in originate mode when the user wanted the device to be
in answer mode.  SET SERVER TIMEOUT 0 can now be used in such situations.

MAKE C-KERMIT SEND NAKs: ckcpro.w, ckcfns.c, ckcfn2.c, ckcmai.c.  Up till now,
C-Kermit has always responded to a corrupted packet or a timeout by resending
its previous packet.  It turns out that when talking to a more generalized
Kermit program -- i.e. one that provides for sliding-window packet transfer,
where a window size of 1 is just a special case -- that it is better for
C-Kermit to send NAK packets in response to corrupted packets or timeouts,
which a sliding-windows Kermit will act upon immediately.  This is done by
adding a flag variable, nakstate, in ckcmai.c.  This variable is set to 1 in
ckcpro.w before rdata state is entered.  In the input() function (ckcfn2.c), a
NAK is sent in response to a timeout or corrupted packet if nakstate != 0,
otherwise the previous packet is resent, as before.  In function tinit()
(module ckcfns.c) nakstate is reset to zero at the beginning of each
transaction.

ckcpro.w: Cure a longstanding bug.  When in <sseof>Y state, if there's another
file to send, the transition is to state ssfile, not ssdata!  The problem was
that if C-Kermit was sending a file whose name began with X or Z, and the
other Kermit echoed back the filename in the data field of the ACK packet (as
C-Kermit itself does), the improper immediate transition into ssdata state
caused the ACK data field to be checked for X or Z, which is the signal for
file interruption.  The fix prevents the data packet protocol from looking in
the ACK to the file header.  The reason it escaped notice for so long is that
it could only happen when sending a wildcard group of files with names
starting with X or Z and with SET FILE NAMES LITERAL (which forced the
normally lowercase X's or Z's to be uppercase) from one C-Kermit to another
C-Kermit.

ckcpro.w: Reformat and comment.  No longer try to preserve the illusion that
Kermit is such a simple protocol it can fit on 2 pages...

ckcfns.c: In tinit(), set spktl = 0, so that a 'server' command given after
some other command will transmit a NAK(0), rather than whatever the last
packet happened to be (this bug had been there forever).  In sinit(), make
sure that C-Kermit sends an error packet if a 'get' command to the C-Kermit
server results in too many filenames.

ckwart.c: Change data type of state transition array from short to CHAR.  Save
several more K.

VMS support: Add changes from Mark Buda & Barry Archer to ckuusr.c within
"#ifdef vms" conditionals -- VMS-specific way to find init file, and special
handling of DIRECTORY command.

ckuusr.c: Add some debugging info to trap().

ckuus2.c: In rdebu(), change reference to rdatap (which could sometimes
be uninitialized) to data+1, which always works.  This one could cause core
dumps with 'set debug on' at beginning of file transfer.

ckuus3.c: In screen(), always issue error or warning messages (even if
in quiet or no-display mode).

ckutio.c: Many changes, mainly to prevent opening of terminal in O_NDELAY
mode, skip the exclusive access baloney, hanging up, etc etc, when terminal is
job's controlling tty.  Also, if terminal is job's controlling tty, use file
descriptor 0 (stdin) rather than obtaining a new file descriptor on it.  This
allows UNIX "idle line monitors" to properly detect Kermit activity and not
log out Kermit users in the middle of 40-megabyte file transfers because the
tty line appears to be idle.

ckufio.c and ckutio.c: Add UNOS support from David MacKenzie,
edf@rocky2.rockefeller.edu.  Add function zinfill() for buffered file input,
from Paul Placeway.

ckudia.c: Slightly better support for Hayes modems -- try to catch the case 
where user dials out at 2400 but gets connected at 1200.