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Message from discussion strange string-to-float error on ubuntu karmic (alpha)
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Nikolai Lugovoi  
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 More options Sep 27 2009, 5:24 pm
From: Nikolai Lugovoi <nlugo...@gmail.com>
Date: Sun, 27 Sep 2009 14:24:57 -0700 (PDT)
Local: Sun, Sep 27 2009 5:24 pm
Subject: Re: strange string-to-float error on ubuntu karmic (alpha)
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On Sep 27, 11:19 am, Mathijs <bluescreen...@gmail.com> wrote:

> I did all updates/upgrades up to today, and installed REE (20090610).
> Installation worked, as did installation of all gems I use.
> When running a rails app, I noticed some strange behaviour(rails
> wanting to return xml for every request), which I traced down to the
> way strings are cast into floats:

> irb(main):001:0> "0.9".to_f
> => 9.0
> irb(main):002:0> "0.901".to_f
> => 901.0
> irb(main):003:0> "1.901".to_f
> => 1901.0

> Since to_f dives into c code, I'm backing off there.

> Anyone else seen this problem?

Hi,
I encountered same problem compiling old ruby-1.8.6  on Fedora 12,
that also uses GCC 4.4.1, as Karmic

At first I couldn't even believe it :), but then found, it was fixed
in later releases, since r16863.

And, funny, it was enough to set errno = 0 in  util.c/ruby_strtod() to
make parsing work again:

http://svn.ruby-lang.org/cgi-bin/viewvc.cgi/branches/ruby_1_8_7/util....

@@ -2103,6 +2112,7 @@
     const char *s2;
 #endif

+    errno = 0;
     sign = nz0 = nz = 0;
     dval(rv) = 0.;
     for (s = s00;;s++)

Hope that helps :)


 
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