Re-init the UART struct in the init routine to avoid confusion when making .ini file changes with older NTVDMs (including NTVDMx64) which don't re-load the VDDs for every invocation.

Added undocumented experimental options -I and -O to enable DOS input and output interception modes in sbbsexec (e.g. to be used possibly with '-h'). Also -M to specify sbbsexec mode value by number (e.g. 3 to enable DOS Input/Output redir).

Added '-n' option to specify node number (probably no real value/need).

Safe string formatting.

When listening, the address family cannot be PF_UNSPEC, so default to PF_INET (IPv4), when not specified.
Not sure why we're setting ai_flags to PF_UNSPEC (copied from syncterm) - that's just 0, but otherwise the PF_ and AI_ flags are not compatible.
Don't set the ai_flags to anything here since they don't seem to change the behavior.

Fix a corner case where an invalid command-mode escape sequence (e.g. "+.+.+") could've been interpreted as valid.

More case-insensitivity in parsing special "number" values (e.g. 'L' for last number).

Default to Telnet mode (not Raw TCP).
Default to unspecific address family (not IPv4).
Case-insensitive "-telnet" and "-raw" option recognition.

To (re)generate git_branch.h and git_hash.h every build

svdm -V and "ATi1" output.

To be more consistent with other Synchronet project and solution files.

So it can be reused for other projects more easily

Set sbbs_hungup event state correctly based on initial online state (i.e. FALSE if already connected/online).

Allow BusyNotice (string) to be configurable via .ini file.

Support specifying an additional or alternate .ini file to read using -c<fname> option.

Support [sockopts] (socket options) settings in ini file

CamelCase the ini key names

When looping to highest user number, use system.lastuser, not
system.stats.total_users.

This explains why not all userbases would be affected by the just-fixed
issue in js_user.c. If the total_users happens to equal lastuser, then
you would have hit the issue in js_user.c. If you had at least one
deleted or inactive user account, then system.stats.total_users would
be less than system.lastuser and your system would *not* have triggered
that bug.

When the 'number' property of an instance of User was incremented beyond the last user, the call to fgetuserdat() on subsequent property 'get' operation would fail and zero-out the user structure (including the user number). This resulted in an infinite loop in load/birthdays.js where the user number would go from lastuser to 1 in one operation (u.number++).

Reported by DesotoFireflite (VALHALLA)

DD area choosers: Fixes for searching & related error reporting

See merge request main/sbbs!171

Build using WinXP-compatible toolset.

sbbsctrl build failed, it needs another winsock header. <sigh>

Oh what a rabbit hole this has been.

And create IPv4AddressToStr(), a wrapper for inet_ntop (or inet_ntoa, when inet_ntop isn't available).

Fixes CI and nightly build.

e.g. AT&W writes the current settings to the [modem] section.

Use inet_ntop and inet_pton instead.

Use 32-bit arguments and return values for IPv4 addressess for all target platforms (ulong is 64-bit on LP64, e.g. Linux-x64, targets).

Have a service (e.g. imapservice.js) that logs errors that you'd rather not fill your error.log file with? Set that service's "LowestLogLevel" to "Warning" in your services.ini file ("lower" means "more severe" when it comes to log levels, so this would set the maximum severity to Warning).

Some responding programs will automatically remove the trailing white-space from subject when replying and that would mess up the subject-linkage-by-CRC. So let's just ignore trailing whitespace in the first place.

Reducing log output (lowering log level of line 437 from LOG_INFO to LOG_DEBUG) highlighted an issue with Telix stopping RX. That was fixed by checking RTS in input_thread(). Qmodem needs RTS checked when writing the MCR.

This improved RTS support has been tested with Telix, Qmodem, Telemate, and Banacom at full data rates.

New option to disable local screen display for door programs: sets the 'Screen' value appropriately in door.sys or pcboard.sys drop files and on Windows, doesn't create a new console window.

Also, now parsing the DOSXTRN.ERR file created by the latest/greatest dosxtrn.exe when failing to execute the child/DOS program and log the parsed error details (errno value and description), helpful in debugging the reason why a DOS program may not have been successfully executed by DOSXTRN.

The other msgbase property values are stored in the smb.status or other private_t members which retain their value when the message base is closed, unlike the 'first_msg' property which required a read of the message base index to get the value (and that doesn't work when the message base is closed, so would return 0).

for deon (ALTERANT)

First commit.

Right now it just connects/accepts-connections using raw TCP. As demonstrated in YouTube video:
https://www.youtube.com/watch?v=fxp38Nde3fg

In the process of creating/testing the new Synchronet Virtual DOS Modem (SVDM) project, I made the following significant improvements:

- Don't default the log level to DEBUG for debug builds
- Add a "carrier change" event so carrier low to high transitions can be tracked too
- Replace several lprintf() calls with lputs() for performance reasons
- Specify 'volatile' storage for pending_interrupts
- Interrupts are re-asserted if there are any pending interrupts after reading IIR register
- Emulate FIFO enablement
- Support RTS flow control signal
- Remove conditional/configurable yields when polling LSR and MSR register, would just unnecessarily slow down terminal programs
- Report "DCD change" in MSR correctly
- Clean-up (e.g. close handles) in VDD_CLOSE handler
- VDD_LOAD_INI_FILE allows an optional ini filename (instead of directory) as its argument - for loading an ini filename other than sbbsexec.ini (e.g. svdm.ini).

Initialize log level in VDDInitialize(). For versions of Windows/NTVDM that use/call the "init proc" (this function), we just re-initialize global variables here.