This should resolve (new) CID 434884 and 434885.

Also, remove the SAFECOPY_USES_SPRINTF check/block - nobody enables this.

DDMsgReader: Small change in resetting the terminal attributes before the script exits

See merge request !247

This fixes issue #495.

We need to support the same filename in different directories.

The 'path' key is just an artifact and not normally used when read,
so that was a distraction that apparently confused me previously
and I broke this functionality in commit c44ed79a.

This should fix the issues reported by xbit (XBITBBS) on DOVE-Net.

Also, don't open the file.ini for write-access (unnecessary).

The sub_t.subnum's that were being updated as message areas were being saved to
msgs.ini could not be used as an index into the scfg_t.sub array at this point
(the subnum would be the new index position when the msgs.ini was re-read/loaded)
.

This was not an issue in v3.19 because we just saved the subnum (to msgs.cnf) and
in v3.20, we save the sub's internal code (to msgs.ini) and were using the newly
updated sub_t.subnum to find the corresponding sub_t for that internal code. Since
the subnum is not used now during the save process, no need to update it here
(this reverses part of the commit 11e529d4 from 5 years ago).

This fixes issue #502 - thanks to the irc.synchro.netizens that reported it!

The first argument to system.matchuserdata() in v3.20 is the user.tab field
number, not the user.dat byte-offset that was used in versions of SBBS prior
to v3.20.

These values are synchronized with userfields.h, but I keept the U_ prefix
here (instead of USER_) to maintain compatibility with existing JS scripts.

This is a fix for issue #501 - thanks for the report Eric!

DDMsgReader: Fix for #499 (replying to emails from unknown user)

See merge request !246

IF user hits 'Q' (or whatever the "Quit" key is), set the default protocol
field in the user record to " " (instead of an empty string).
If user hits abort (Ctrl-C), don't make any change to the default protocol.

There's nothing to upgrade if there's no legacy userbase.

A blank download protocol field in a user.dat, when parsed, sets the 'prot' field
of user_t to 0. When writing the record back to the user.dat, this would prematurely
truncate all other fields off the user record (since strings in C are NUL terminated
and we're using sprintf() to format the record and %c specifier for that field).

The fix is to write a ' ' character instead of '\0' if the user_t.prot is '\0'.
As part of this fix, I'm writing a '?' if a user_t.sex is '\0' (not sure if this
is actually possible, but just as insurance). Those are the only 2 single-character
user properties/fields today.

Bug reported/debugged by Al of The Rusty Mailbox (1:153/757.2) - thank you!

This old prompt used to be sent for any login scripts (e.g. QWKnet
via dial-up) that would key off that WWIV-like "name or number"
(NN:) prompt, but was removed (accidentally?) in commit fedabb0b.

Send "NN: " and "PW: " (include the trailing space, just in case), and use
carriage return to move back (and overwrite) rather than 4 backspaces.

DDMsgReader can now optionally convert Y-style MCI attributes to Synchronet attributes.

See merge request !244

The SBBS event_thread ignores 0-byte QW* files, so we should here as well
(just overwrite them if they exist), otherwise, if 10 0-byte QW* files got
created, we would just stop downloading QWK packets indefinitely.

Fixes issue reported by deon (ALTERANT) on DOVE-Net.

This function has been causing somewhat rare crashes (e.g. one per week on a very active system with MQTT enabled) on both Windows and Linux (see issue #495). The root-cause is still unclear (possible heap corruption?). This function needed more robustification anyway (see previous TODO comment), so I'm refactoring here to no longer use strListAppendFormat, which uses vasprintf (the function where the rare crash was occurring) and instead just use snprintf and strListPush. The total client_list that's published (as a single string/message) is now dynamically allocated (this was the point of the previous TODO comment). This may not actually fix the issue if there's a heap corruption occurring somewhere else in this function or the call-chain that's reaching here (usually from the web server).

Another change to mqtt_client_on(): don't incremented the server's 'served' counter until client disconnects (this is a past-tense statistic).

Also:
- mqtt_pub_strval() can now accept a null 'str' argument which is effectively the same as mqtt_pub_noval(), so the pub_noval() function is now just a thin wrapper around pub_strval().

- mqtt_startup() now clears the client_list topic and sets the client_count topic to 0.

Reduce occurrences of subsequent errors (unsure of root-cause):
!ERROR 2 (No such file or directory) in main.cpp line 2778 (event_thread) removing "/sbbs/data/pack0341.now"

This does seem to be the only location that deleted pack*.now files, so weird that they'd disappear sometime after calling glob(), but I do understand that its theoretically possible.

No immediate need/use.

Screen header update optimization for file searching & scanning

See merge request !243

As reported in #synchronet by Android8675

Fix for issue #494 (DD File Lister searching and scanning)

Closes #494

See merge request !242

It'd be nice if someone (me?) tested this. :-)

Fixes issue #477

There are some changes in here that I forgot the history behind, but the
most important is that it uses file.ini rather than file.cnf, thus
fixing issue #478. I actually had this changed file sitting outside of my
git repo for a while now and didn't realize it.

The other changes appear to be:
- RIP support (clearing the window before/after each file is displayed)
- read the display files a chunk at a time (rather than read the entire file
  into RAM, which could take a really long time on very large files),
- allow files that don't exist on disk to be added to the list

Fixes issue #475

Fixes issue #472

Fixes issue #471

The "opening list file" log message referenced in issue #480 is a debug
level log message, so seemed appropriate to make the newly-added message
also debug-level.

Fixes issue #480

Fixes issue #473

Replaces functionality of cnflib.js for sbbs v3.20+

Only the xtrn.ini read/write support has been added so far
(for use in install-xtrn.js).

I didn't think a lib like this would be needed, being that the
files are now in .ini format, but there was some re-arranging
of property values/section names that still needed to be done by
something (unfortunately), so this does that. But it does make
updating existing scripts that use cnflib.js a breeze.

to remove all sections in an .ini file or all sections with a specified
prefix.

Migrate filearea-lb.js to use FileBase

See merge request !240