will now expand to "raw" rather than "telnet/rlogin/ssh". This disables IAC
handling in sexpots, for example, which isn't needed or desired when using
the passthru socket.

Also, put some conditional checks for passthru_thread_running in external()
and if it's not (e.g. for testing purposes), then lock the input_thread_mutex
instead of changing passthru_socket_active. This is currently just a way to
easily test the differences between direct and passthru socket I/O
(dependant on whether or not the passthru_thread is running which is controlled
in main.cpp.

use socket I/O (e.g. sexyz, door32.sys doors, sync-xsdk doors) - not just when
the client is connected via SSH. This solves a number of problems:
- programs that change socket options
- programs that don't support non-CP437 charsets (e.g. PETSCII, UTF-8)
- programs that don't support Telnet-IAC escaping

This greatly simplifies (reduces the need for) input_thread locking.

The passthru_thread now handles chunks of up to 4000 bytes per transfer
between socket and ringbuf, instead of a char at a time, greatly improving the
performance.

it and decide whether to write directly to the output ring buffer (EX_BIN) or
use rputs() for charset translations.

translation "for free". Windows only for now.

can't because it's a DOS program and the current node doesn't support it.

Fix the missing carriage-returns in the shell (bash) prompts by always building with the stderr logging
support (in *nix builds) - but run-time disable as desired via EX_NOLOG option. I've been wanting to get
rid of that "XTERN_*" macro for a long time anyway (it's "XTRN" damn-it!). :-)

intercepted output to stderr won't be logged.

i've made a few adjustments to xtrn.cpp for external.bat...

- remove unneeded redirection of dosemu output.
   still uses same log file name and stops zero
   byte file dosemu.log from being created in node
   directories.
- fix faulty "keystroke" dosemu -I command. it
   didn't actually do the "\r" but sent it as
   characters to the command line.
- added code for SBBS specific lredirs to be
   done more cleanly like dosemu's default
   autoexec.bat. only deletes redir if it exists.

His editor also appears to have removed trailling white-space from this file,
which is fine.

sbbs_t::cmdstr() and cmdstr().

Use case-insensitive check of executable file extension for ".bat".
The obvious "fix" would have been to use strcasestr() instead of strstr(),
but that would leave the unlikely corner case of x.bat.exe producing a
false-positive, for example. Use the proper functions for getting a file
extension and performing a full case-insensitive string compare.

"overly long" cmdlines.
Also fixed a bug (for Windows) where external() would return 0 (success) even
when CreateProcess() fails - must re-restore the "last_error" value before
returning.

- include errno description (strerror output)
- exclude (redundant) node number

now have their output translated to PETSCII equivalents for PETSCII terminals
(but input is not yet translated).
.seq files are now sent untranslated via printfile() and putmsg() to PETSCII
terminals (using the new P_PETSCII putmsg mode flag).
.seq files (and P_PETSCII mode text printed via putmsg) is now converted
(poorly) from PETSCII to CP437 - this is still a work-in-progress.
Remove the remants of WIP and HTMLterm support from putmsg() and printfile().

sbbs::lputs() will log the current user alias already, logline()->lputs() would
create log messages with the user alias twice.

("Node X", user alias, etc.) - so removing a lot of the redundancies.
Also, logging the current timed event code and other prefixes in the
event thread log messages - something I've wanted for a while now.
There might be some redundant "Node X" strings, so if you see some funny
looking log message, please let me know.

for DOS programs (part of the USE_DOSEMU patch).

*nix-builds (for stdio WWIV doors).

emusetup.bat).
It was generating an (easy to fix) GCC 5.4.0 warning:
format not a string literal and no format arguments [-Wformat-security]
But the line was not needed, so just removed it.

unused variable 'p'
comparison between signed and unsigned integer expressions

SAFECOPY() which has been seen to cause a blank "CD" line in the created
dosemu.bat file.
Nelgin will compile and test. :-)

environment variable (to the same value as SBBSNNUM) as some door games
(e.g. Bordello, by T&J Software) have support for this environment variable
built into their configuration file parsing. This makes setting up multiple
nodes much easier/faster, as you can re-use the same configuration file for
all of them by just specifying this environment variable in the .cfg file
(e.g. "c:\sbbs\node%PCBNODE%\door.sys"). Unfortunately, you can't use just
*any* environment variable, it has to be one of the ones specifically supported
by their programs (or door frame door kit?). Anyway, this simple hack can save
a lot of time setting up some of these doors.
I did not do this for executing native (32-bit) programs as I'm pretty sure
there was never a 32-bit version of PCBoard, so that wouldn't make much sense.

FidoNet NetMail can now be gated to an SMTP client (as before), but replies are
now successfully gated back to FTN NetMail. This uses a new more RFC-compliant
To/From address header field format, so older messages (previously gated to
an SMTP client) cannot be successfully replied-to. Tested with Microsoft
"Windows Live Mail 2012" (previously known as Outlook Express).
Test reports/results with other SMTP mail clients would be welcome.

Requires SBBSecho v2.30 or later. File attachments are not yet supported.

with the ability for the running program to override it, so stop calling
lf_expand() when EX_STDIO is set.  This makes the default scfg as a door
configuration work properly on *nix systems and shouldn't bork any existing
configs.

for that instance of SBBS (e.g. when running SBBS-Win32 on Windows-x64).

I've likely broken something though, so if you see weird behaviour with
extended ASCII, let me know please.

longer (use lprintf(LOG_ERR,...) instead, which does).
Added sbbs_t::hacklog() for convenience.

termios.h now via comio.h

long?).