fix WARNS=4 issues (const & type mismatches)

ANSI KNF

- use getnameinfo instead of gethostbyaddr
- add tsa2sa and use it

PR/27097: John Klos: Talk daemon does not find additional ttys for
a particular user if the first tty is not writable. This broke in
revision 1.9 when it was strl'ified incorrectly (hi itojun). Thank

PR/27097: John Klos: Talk daemon does not find additional ttys for
a particular user if the first tty is not writable. This broke in
revision 1.9 when it was strl'ified incorrectly (hi itojun). Thanks
to enami for spotting this.

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Move UCB-licensed code from 4-clause to 3-clause licence.

Patches provided by Joel Baker in PR 22284, verified by myself.

strlcat is easier here

find_user() in process.c does an unbounded copy into a destination
buffer that is smaller in size than the source buffer.

also, there is no guarantee that any of the string components of
the request

find_user() in process.c does an unbounded copy into a destination
buffer that is smaller in size than the source buffer.

also, there is no guarantee that any of the string components of
the request packet are null terminated.

in some cases, not all elements of the response buffer are
explicitly set. specifically pad and addr. a talk client can spy to
see which host is talking to which host by sending out regular
packets, to which talkd responds without clearing the addr element.

from xs@kittenz.org

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utmpx support

- clean up some more cruft
- support "talkd -l" for extra (syslog(3)) logging
- fix error in previous announce.c change
- use getopt
- add (missing) -d and -l descriptions to man page

- use S_IWGRP over 020
- KNF
- ensure we don't overflow a buffer (don't think it would anyway).
- favour snprintf over sprintf (and varargs versions)

- use ttymsg from libutil
- clean warnings
- PR/3778: Eric Fischer: talkd should find the least idle terminal

Merge in lite-2

Add RCS identifiers.

initial import of 386bsd-0.1 sources