Revert r330897:

This was intended to be a non-functional change. It wasn't. The commit
message was thus wrong. In addition it broke arm, and merged crypto
related code.

Revert with prejudice.

This revert skips files touched in r316370 since that commit was since
MFCed. This revert also skips files that require $FreeBSD$ property
changes.

Thank you to those who helped me get out of this mess including but not
limited to gonzo, kevans, rgrimes.

Requested by: gjb (re)

Partial merge of the SPDX changes

These changes are incomplete but are making it difficult
to determine what other changes can/should be merged.

No objections from: pfg

MFC r317583:
Fix some cases where an index was used before its limits check.

Obtained from: DragonFlyBSD (git 799ba435)

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

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

Add missing static keywords to unexpand(1)

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

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

Document that unexpand(1)'s -a and -t options are exclusive.

PR: docs/85063

Add support for multibyte characters and for characters that take up
more than one column position.

Fix off-by-one error processing the line after an empty line when the
-a option is not specified.

Submitted by: schweikh
MFC after: 1 week

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

Allow <blank>s to be used to separate tab stop positions with the -t
argument, not just ASCII space characters and commas. Don't count
non-printing characters when determining column position.

Some minor nits exposed by the Open Group's VSC Lite verification suite:
- When an error occurs processing one file, we must continue to process
the remaining files.
- Convert trailing whitespace to tabs as appropriate.
- Align backspace handling with what the verification suite expects.

Reviewed by: mike

Add the -t option, which allows tab stop positions to be specified similarly
to the way expand(1) allows. This brings unexpand(1) up to SUSv3 conformance,
and it now passes all relevant parts of the GNU textutils test suite.

PR: 35621
Reviewed by: mike

remove __P

WARNS=2 is to become the default, so remove. Use __FBSDID().

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

Submitted by: Mike Barcroft <mike@q9media.com>

$Id$ -> $FreeBSD$

Add #include <string.h> to get prototypes.

Main() returns int.

Use err(3) and add usage().

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

BSD 4.4 Lite Usr.bin Sources