New libutil function: parse_capacity(3).

[Pawel Jakub Dawidek]

Hello.

I implemented parse_capacity() function which can be use to convert a
string with a human-readable capacity value to a off_t value.

It can be used by utilities like:

	% truncate -s 8g test
	# mdconfig -a -t malloc -s 16M

Patch can be found here:

	http://people.freebsd.org/~pjd/patches/parse_capacity.patch

Any comments before committing?

-- 
Pawel Jakub Dawidek                       http://www.FreeBSD.org
pjd at FreeBSD.org                           http://garage.freebsd.pl
FreeBSD committer                         Am I Evil? Yes, I Am!
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