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970226: Porting UDunits to PC

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  • Subject: 970226: Porting UDunits to PC
  • Date: Wed, 26 Feb 97 10:21:57 -0700
Arlindo,

>Date: Wed, 26 Feb 1997 11:59:51 -0500 (EST) 
>From: Arlindo da Silva <address@hidden>
>Organization: NASA/GSFC
>To: address@hidden (Steve Emmerson)
>Subject: Re: 970226: Porting UDunits to PC 
>Keywords: 199702221703.KAA06697

In the above message, you wrote:

> Here is what I get (I am just editing this by hand):
> 
> >     struct {
> >     origin = 5.3853155396696e-322
> >     factor = 0.00000
> >     hasorigin = 0
> >     power = {
> >         [0] 0
> >         [1] 0
> >         [2] 0
> >         [3] 0
> >         [4] 0
> >         [5] 0
> >         [6] 0
> >         [7] 0
> >         [8] 0
> >         [9] 0
> 
> 
> The "factor=0" is what makes utPrint() to return a NULL; it also gives NANs
> when used in utRaise(). Last night I was trying to trace where the apparent
> junk (origin=...e-322,factor=0) was coming from without much luck.  My guess
> is that it could be related to the bison/utlib interface, but I am not sure.

Tough problem.

The parser calls units-handling functions in the file utlib.c.  All I
can suggest is calling those functions (via a small program) and seeing
what they do.  I think the steps to investigate are the following (based
on the `NAME INT' sequence in utparse.y):

    UtUnit      unit1, unit2;

    utFind("m", &unit1);

    utRaise(&unit1, 2, &unit2);

    utCopy(&unit2, &unit1);

Hopefully, at some point one of the above function calls will mess-up.
At which point we can investigate further.

Let me know what you find.

--------
Steve Emmerson   <address@hidden>