usr.bin: Automated cleanup of cdefs and other formatting

Apply the following automated changes to try to eliminate
no-longer-needed sys/cdefs.h includes as well as now-empty
blank lines in a row.

Remove /^#if.*\n#endif.*\n#include\s+<sys/cdefs.h>.*\n/
Remove /\n+#include\s+<sys/cdefs.h>.*\n+#if.*\n#endif.*\n+/
Remove /\n+#if.*\n#endif.*\n+/
Remove /^#if.*\n#endif.*\n/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/types.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/param.h>/
Remove /\n+#include\s+<sys/cdefs.h>\n#include\s+<sys/capsicum.h>/

Sponsored by: Netflix

usr.bin: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

General further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 3-Clause license.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

Special thanks to Wind River for providing access to "The Duke of
Highlander" tool: an older (2014) run over FreeBSD tree was useful as a
starting point.

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

Use NULL instead of 0 for pointers.

strchr(3) will return NULL if the character does not appear in the
string.

MFC after: 2 weeks.

Fix printing multibyte printing when performing a networked finger(1) request

MFC after: 1 week

Staticify cleanup() which is not referenced in other places.

MFC after: 2 weeks

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

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

Create the altix project branch. The altix project will add support
for the SGI Altix 350 to FreeBSD/ia64. The hardware used for porting
is a two-module system, consisting of a base compute module and a
CPU expansion module. SGI's NUMAFlex architecture can be an excellent
platform to test CPU affinity and NUMA-aware features in FreeBSD.

Migrate finger(1) towards utmpx.

It was already ported to use libulog, which makes it simpler now. Be
sure to catch the error returned by setutxdb(). Otherwise it may perform
a lookup on the utx.active database.

Migrate finger(1) away from <utmp.h>.

Unfortunately it also uses lastlog, which means we must resort to local
extensions of the utmpx-interface. Because the user name and TTY name
are now nul-terminated, there is no need to copy around strings as
often.

Revert most part of 200420 as requested, as more review and polish is
needed.

Remove unneeded header includes from usr.bin/ except contributed code.

Tested with: make universe

- Import the HEAD csup code which is the basis for the cvsmode work.

Remove T/TCP support, and the -T option which was needed to disable it.

MFC after: 3 weeks

Remove spurious semicolons. Outside of functions they are actually errors but
GCC doesn't warn about them without -pedantic.

Approved by: das (mentor)
PR: 56649
Reviewed by: md5

Make a CR/LF sequence measure up to its name: the order of the CR and LF
characters was reversed, resulting in some network appliances, including
at least some NAS devices from Ascend, not recognizing our finger(1)
request.

PR: 45914
Submitted by: J R Matthews <jrm@delta-e.com.au>
Approved by: re (rwatson)
MFC after: 2 weeks

ANSIify function definitions.
Add some constness to avoid some warnings.
Remove use register keyword.
Deal with missing/unneeded extern/prototypes.
Some minor type changes/casts to avoid warnings.

Reviewed by: md5

add -4 and -6 option to be able to specify an address family.

Requested by: matusita
MFC after: 1 week

Style improvements recommended by Bruce as a follow up to some
of the recent WARNS commits. The idea is:

1) FreeBSD id tags should follow vendor tags.
2) Vendor tags should not be compiled (though copyrights probably should).
3) There should be no blank line between including cdefs and __FBSDIF.

WARNS=2 fix, remove 'register' and use __FBSDID().

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

Spelling
Remove unused #includes

-Wall cleanup.

PR: 22187

Don't assume ai0->ai_canonname will always be filled in. Print the
user-supplied host name if we can't get a canonical name.

Obtained from: contrib/tcp_wrappers/socket.c rev. 1.4 (in spirit)

Implement IPv6 support. Also restructure the way multi-homed hosts
are treated, regardless of protocol.

$Id$ -> $FreeBSD$

Impliment elements of TCP Wrappers's `safe_finger'.
* if run by root (or root process) drop privs
* ensure output size is not infinate (net finger only)
* ensure output lines are not infinate in length (net finger only)
* do not allow finger client to run longer than 3 minutes (net finger only)

Don't assume that hp->h_lenght == 4. Be conservative in its use.
Submitted by: J. Assange a long time ago.

So somebody actually found language in the FINGER RFC which requires
implementations to leave the client side open until the server closes.
While this is totally idiotic, it seems as if some servers actually require
it (e.g., the one at mit.mit.edu). So, we bow to the weight of the bogus
standard and disable the initial close. Hopefully now fetch(1) can serve
the role of T/TCP demonstration application.

Add rcsid, usage(). Silent -Wall. Use warn(3).

Merge from Lite2

Import some parts of CSRG 4.4BSD-Lite2 usr.bin sources to fix tree build.

Allow the user to disable the use of T/TCP by setting the -T option.
This option becomes useless when all TCP stacks are fixed out there.

Print 8bit chars from the net if current locale allows them

Implement client-side transaction TCP. This has little effect
if the server doesn't support it. (This is intended mostly as
an example.)

Remove trailing whitespace.

Remove extra newline introduced in Net/2

BSD 4.4 Lite Usr.bin Sources