[PATCH] truncate: new applet

[Ari Sundholm]

On Tue, 2015-03-03 at 17:02 +0000, Isaac Dunham wrote:
> On Tue, Mar 03, 2015 at 06:11:55PM +0200, Ari Sundholm wrote:
> > I wrote this for my own purposes and cleaned it up in hopes it is useful.
> > 
> > Signed-off-by: Ari Sundholm <ari at tuxera.com>
> > ---
> >  coreutils/truncate.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 92 insertions(+)
> >  create mode 100644 coreutils/truncate.c
> > 
> > diff --git a/coreutils/truncate.c b/coreutils/truncate.c
> > new file mode 100644
> > index 0000000..f997cd2
> > --- /dev/null
> > +++ b/coreutils/truncate.c
> 
> > +static const struct suffix_mult truncate_suffixes[] = {
> > +	{ "c", 1 },
> > +	{ "w", 2 },
> > +	{ "b", 512 },
> > +	{ "kB", 1000 },
> > +	{ "kD", 1000 },
> > +	{ "k", 1024 },
> > +	{ "K", 1024 },  /* compat with coreutils dd (it also accepts KB and KD, TODO?) */
> > +	{ "MB", 1000000 },
> > +	{ "MD", 1000000 },
> > +	{ "M", 1024*1024 },
> > +	{ "GB", 1000000000 },
> > +	{ "GD", 1000000000 },
> > +	{ "G", 1024*1024*1024 },
> > +	/* "D" suffix for decimal is not in coreutils manpage, looks like it's deprecated */
> > +	/* coreutils also understands TPEZY suffixes for tera- and so on, with B suffix for decimal */
> > +	{ "", 0 }
> > +};
> 
> Was this copy-pasted from coreutils/dd.c?
> The bloat could be reduced by making it shared between dd and truncate;
> if my math is right, this table is at least 87 bytes.
> 

Yes, it is copy-pasted from dd.c. When writing this applet I did briefly
think of having these shared somewhere, but eventually didn't do
anything about it.

It would probably be a good idea indeed to create a common list of
filesize suffixes and use it in applets which need them (not necessarily
limited to truncate.c and dd.c).

Best regards,
Ari Sundholm
ari at tuxera.com