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

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

Rev 1.4 shut up warnings about uninitialized (not unused) variables.

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