Re: [bug-cgicc] possible bug in getDoubleValue

[Alexander J. Oss]

Which platform and compiler are your working on?  Perhaps there's a patch to
one of them that's needed?

...although it is interesting that in FormEntry.h, the default min parameter
has no STDNS, while the max does.  Hm.

----- Original Message -----
From: "Carsten P. Gehrke" <address@hidden>
To: <address@hidden>
Sent: Tuesday, October 08, 2002 4:56 AM
Subject: [bug-cgicc] possible bug in getDoubleValue


Using cgicc for the first time, I came across some behavior which I could
not explain.  I have distilled the code to a minimum which still exhibits
the problem, and have taken the liberty to pack everything in a gzipped
tarball attached to this message.  I have included the recommended output
of support/config.guess and ./configure in the aptly named file out.

The problem I have encountered is in the getDoubleValue method of a form
parameter.  If I invoke this method without MIN and MIX limits (i.e. as
getDoubleValue()), and pass a negative value, the result is an extremely
small number (something like 2.22507e-308) and not the expected value.  If
I specify MIN and MAX limits, the result is as expected.  If I pass a
positive value, the result is as expected (regardless if limits are
specified or not).  If I invoke the getIntegerValue method, the results are
as expected in any case.

Instead of using a form, I have used a simple href link like this:
<a href="/cgi-bin/getDoubleValue_bug?value=-10.5>
I do not see this as a problem, although I could be wrong.

The tarball contains these files:
out - the output of support/config.guess and ./configure, as suggested
getDoubleValue_bug.cpp - a short program invoking the getIntegerValue and
getDoubleValue methods with and without MIN and MAX limits, and generating
a simple HTML document with the results
Makefile - to build the above program
getDoubleValue_bug.html - simple Web page to invoke the above program with
different values

I have taken a glance at the source code for getDoubleValue, but could not
find anything that seemed to be the obvious culprit.  Perhaps I am just
using the cgicc package incorrectly.  Any help in this matter would be very
much appreciated.

Thank you,
Carsten Gehrke


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                             Carsten P. Gehrke
                      mailto:address@hidden
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