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

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

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

Static'ify signal handler which is not called from outside.

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

remove __P

Use STD{ERR,IN,OUT}_FILENO instead of their numeric values. The
definitions are more readable, and it's possible that they're
more portable to pathalogical platforms.

Submitted by: David Hill <david@phobia.ms>

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

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

Remove home-grown prototypes of time() and localtime().

Reviewed by: md5(1)

Call usage() if given more than 1 argument.

Submitted by: "Andrew R. Reiter" <arr@watson.org>
Obtained from: OpenBSD

$Id$ -> $FreeBSD$

Don't let secs variable wrap if <= 2.

PR: 6290
Submitted by: Ruslan Ermilov <ru@ucb.crimea.ua>

1. Don't reject 0145 if started at 22XX.
Applied suggested fix from Andrew Andrew <andrew@ugh.net.au> with
some stylistic changes. Thanks.
2. #include <sys/time.h> -> #include <time.h>
3. Removed #include <sys/param.h>
4. Use setlocale(3) and strftime(3) instead of ctime(3).
5. Clean up -Wall warnings.
6. Make sure, time to leave are integral minutes if the argument
is absolute. (i. e. without "+"). If started at 10:10:55 with
argument "1020" it computed time to leave as 10:20:55 instead of
10:20:00.

PR: 5395

Check fgets' return value, silent -Wall.
Obtained from: OpenBSD

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