Purge more stray embedded $FreeBSD$ strings

These do not use __FBSDID but instead use bare char arrays.

Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D41957

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

truncate(1): Add hole-punching support

This commit adds hole-punching support to the truncate(1) utility. If
the option -d is specified, truncate(1) performs zeroing, and if
possible hole-punching in case the operation is supported by the
underlying file system of the specified files.

Sponsored by: The FreeBSD Foundation
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D31556

truncate(1): main() return statement style fix

Sponsored by: The FreeBSD Foundation

truncate: delintify

truncate: use better type for 'round'

truncate: Add support for -s % and /

% round up to the multiple size and / round down
This is compatible with gnu truncate.
Add tests and document in the man page.

truncate: style(9) some parts

various: general adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

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.

No functional change intended.

truncate: Detect integer overflow, fix relative sizes, add tests.

The change to expand_number (r204654) broke detection of too large sizes and
relative sizes ('+'/'-').

Also add some tests.

PR: 190735
Submitted by: Kirk Russell
MFC after: 1 week

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.

Use expand_number(3) from libutil instead of home-grown function to parse
human-friendly power-of-two numbers (i.e. 2k, 5M etc).

Suggested by: many
MFC after: 1 week

Initialize 'sz' as 0.

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

Don't close file descriptor number <whatever random garbage was on the
stack>.

Found by: LLVM/Clang Static Checker
MFC after: 1 week

o Don't leak fd on error.
o parselength() returns 0 or -1 so int is enough for its return type.

Submitted by: Ighighi Ighighi, sheldonh
MFC after: 3 weeks

Chase revision 1.10 in usage string and a comment.

Allow to specify size in terabytes by using T or t suffix.
This speeds up my testing a bit. Because truncate(1) doesn't allocate
blocks on file system before they are used, it is very useful to
emulate huge file systems:

# truncate -s 16T fs.img
# mdconfig -a -f fs.img
# newfs /dev/mdX

(-t swap can be used as well)

Sync program's usage() with manpage's SYNOPSIS.

Make size suffix case insensitive.

PR: bin/27604
Submitted by: David Xu <davidx@viasoft.com.cn>

remove __P

Simplify some conditionals.

Shut an optimizing compiler up about possibly (but never) unused
variables.

Submitted by: charnier

truncate.c:
Do not include unused header files.
Add rcsid.
Change copyright.

truncate.1:
Add AUTHORS section.

Submitted by: charnier

Close file descriptors after use so as not to abuse the descriptor
table when a long argument list is given. :-)

Reported by: Sven Agnew <afterhours80@hotmail.com>

Import the new truncate(1) utility.

Approved by: jdp