Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

Remove the advertising clause from UCB copyrighted files in usr.bin. This
is in accordance with the information provided at
ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change

Also add $FreeBSD$ to a few files to keep svn happy.

Discussed with: imp, rwatson

Move unistd.h includes to individual .c files and remove unnecessary
includes.

Utilize strlcpy().

ANSIfy function prototypes. While I am there, constify some parameters and
make use of C99 sparse initialization for static variables, this makes talk(1)
to compile cleanly with WARNS=6.

Change the default behaviour of talk(1) to use "localhost" as the
"machine name" in ntalkd(8) request packets, when the destination
and source are local.

This should make talk(1) use much more pleasant for those security-
conscious individuals who have chosen to bind talkd to "localhost".

Previous to this change, talk(1) would require that the hostname of
the machine, as retrieved by gethostname(3), resolved to a valid and
reachable IPv4 address, using gethostbyname(3).

This makes talk(1) dependent on a valid host entry for "localhost"
in /etc/hosts (or the Domain Name System).

PR: bin/23178
Submitted by: angui.sh admin (with cleanups)

WARNS=2 fixes with NO_WERROR set because of system-header originating
warnings. Use __FBSDID().

Include missing header files which define functions for which gcc has
builtints (e.g., exit, strcmp).

$Id$ -> $FreeBSD$

Add rcsid. Remove unused #includes (what about RU# ?). Change exit(-1) and
add usage().

Make talk automagically find out the interface IP address where the
remote peer will be connected through. This avoids the ``Checking for
invitation on caller's machine'' problem for multi-homed hosts.

Thanks to: Garrett, for his `find_interface' example

Partially back out previous fix (in cases ':' and '!'),
leave case '.' as valid user name, not host reference.
Document new behaviour.

Remove undocumented talk behaviour, when names like
aa.bb aa:bb and aa!bb treated as user+host and not as local user
names (especially aa.bb is common case).
Only @ is valid user/host separator according to manpage.
Pointed-by: doctor@dream.demos.su

This commit was generated by cvs2svn to compensate for changes in r1590,
which included commits to RCS files with non-trunk default branches.

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