Re: [GRAYMAIL] Re: Block GPRINT when values not defined?

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> That sounds interesting and useful but not what we both asking for.
> I would be happy with unknown dates printing nothing at all, padded to =
the
> size of the requested format. What the OP complained about was the =
when
> the value is undefined/Unknown/NaN,  strftime prints 1/1/1970 which =
would
> be correct if the date were known and it=E2=80=99s value was 0. For me =
at -5 UTC so
> it=E2=80=99s always New Years Eve (unless my disk array is going to =
run out of space
> then it=E2=80=99s 2014 =E2=98=B9.

I've just taken a quick look at rrd_graph.c in v1.4.tunk and it seems =
that this should already be happening.

The function sets vf.never=3D1 when the time component is unknown,  and =
if this is the case, then GPRINT should call time_clean rather than =
strtime and so you should get blank when the time would go.  I can't see =
why you'd get it treated as 0, unless either you have an old version of =
RRDTool (which didn't have this check) or else there is a bug and =
vf.never is not getting set.

Possibly the code should treat a zero timeval as 'unknown', since who =
would want to print the date of the epoch anyway..?

If you're running on an older version of RRDTool, I'd suggest upgrading =
to the latest stable 1.4.  You might find the problem goes away.

I do still like the idea of adding an option to GPRINT to specify an RPN =
test controlling if the print is added to the image or not; this would =
give a lot more control over the output.  It's a bit complex for me to =
code up, though...

Steve

Steve Shipway
[email protected]



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