Remove copyright strings ifdef'd out

We've ifdef'd out the copyright strings for some time now. Go ahead and
remove the ifdefs. Plus whatever other detritis was left over from other
recent removals. These copyright strings are present in the comments and
are largely from CSRG's attempt at adding their copyright to every
binary file (which modern interpretations of the license doesn't
require).

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/

Mark usage function as __dead2 in programs where it does not return

In most cases, usage does not return, so mark them as __dead2. For the
cases where they do return, they have not been marked __dead2.

Reviewed by: imp
Pull Request: https://github.com/freebsd/freebsd-src/pull/735

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

look: implement long options
gentoo has "util-linux 2.24.1" with long options. Other distributions
have similar.

usage() is intentionally unchanged to keep it short and sweet

Reviewed by: jmg
Discussed with: adrian, jilles

look(1): add compability with other implementations.

On other implementations 'look -a' uses an alternate dictionary. Since we don't
have one, just ignore it.

Add missing static keywords to look(1)

Sort header file names.

Spotted by: des

Add missing #include.

Note to myself: don't write patches while watching a movie.

Don't cast SIZE_T_MAX to off_t.

I focused so much on the 32-bits case where we have to cast SIZE_T_MAX
up in size, that I forgot about the 64-bits case, where off_t and size_t
are equal in size. Simply cast both numbers to uintmax_t, as we can
assume st_size is never negative.

Reported by: cperciva

Build look(1) with WARNS=6.

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.

MFC r196558: Don't try to mmap the contents of empty files. This behaviour
was harmless prior to r195693, when mmap(2) changed from silently ignoring
requests for mapping zero bytes to returning EINVAL; this commit can be seen
as adjusting for the change in mmap(2) in order to make look(1) act like it
did previously.

Reviewed by: jhb
Approved by: re (kib)

Don't try to mmap the contents of empty files. This behaviour was harmless
prior to r195693, since historical behaviour of mmap(2) was to silently
ignore length-zero mmap requests; but mmap now returns EINVAL, which caused
look(1) to emit an error message and fail.

Among other things, this makes `freebsd-update fetch` on a newly installed
8.0-BETA3 system print bogus warning messages.

MFC after: 3 days

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

Remove break after return.

Add support for multibyte characters. While here, fix a longstanding bug in
the implementation of the -d option: we were skipping too many characters
when a non-alphanumeric character was encountered.

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

Consistently use FBSDID

Fix a const-char vs char issue.

remove __P

Warns cleanup - not ready for WARNS=2 yet.

$Id$ -> $FreeBSD$

Support multiple databases. For example

$ look miau dict1 dict2 dict3

revert: The warning was supposed to irritate someone into fixing this.

unsigned char -> caddr_t for mmap's return value.

Use err(3) instead of local redefinition.

compare return value from getopt against -1 rather than EOF, per the final
posix standard on the topic.

Merge from Lite2

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

Sweep through the tree fixing mmap() usage:

- Use MAP_FAILED instead of the constant -1 to indicate
failure (required by POSIX).
- Removed flag arguments of '0' (required by POSIX).
- Fixed code which expected an error return of 0.
- Fixed code which thought any address with the high bit set
was an error.
- Check for failure where no checks were present.

Discussed with: bde

Make it works with 8bit charsets
Add setlocale LC_CTYPE

Remove trailing whitespace.

BSD 4.4 Lite Usr.bin Sources