Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

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.

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

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

The -r option can also cause the files to be extended (not
necessarily truncated).

Markup fixes.

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.

Added the EXIT STATUS section where appropriate.

Make size suffix case insensitive.

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

remove __P

Remove WARNS?=2 and -Wall. WARNS?=2 is going to be the default.

* Update author's e-mail address.

* When the author of an utility also wrote its manual page (a rarety, I
know), it is not necessary to say that the utility "and this manual
page" were written by the author.

Use the .Cm macro to mark up the modifiers of the -s flag's size argument.

mdoc(7) police: utilize the new .Ex macro.

Remove whitespace at EOL.

Set WARNS=2 on programs that compile cleanly with it; add $FreeBSD$
where necessary.

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

mdoc(7) police: use canonical form of .Dd macro.

mdoc(7) police: use the new features of the Nm macro.

Merge the truncate(1) utility onto the RELENG_4 branch and adjust
the HISTORY section to reflect the first release of FreeBSD in
which this utility will appear.

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>

Add a STANDARDS section to discourage the use of this utility
in environments where portability is a concern.

Import the new truncate(1) utility.

Approved by: jdp