Re: Conversion functions.

[David Nečas (Yeti) <yeti physics muni cz>]

On Tue, Sep 04, 2007 at 11:55:58PM +0200, Magnus Myrefors wrote:
> I tried with strtod() but it only worked with strings with no
> decimal-point, otherwise the resulting double was truncated.
> ...
> > - if the numbers are normal, i.e. supported by underlying
> >   strtod(), try to use it directly -- be careful with the
                                          ^^^^^^^^^^^^^^^^^^^
> >   locale in this case
      ^^^^^^^^^^^^^^^^^^^

strtod() is locale dependent, g_ascii_strtod() is not (well,
sort of, it uses strtod() so if the locale or strtod()
implementation is weird, g_ascii_strtod() can be still
affected).  This is what g_ascii_strtod() is all about.
Your locale uses decimal comma or something like that.  As
if I didn't warn...

> I also tried to copy g_ascii_strtod() (from glib-2.12-9) into
> my code but it didn't compile

My crystal ball says you are missing

  #include <locale.h>

but it's a bit cloudy.

> and I didn't quite understand
> the if-statement if(decimal_point_pos) {} where decimal_point_pos
> was declared as const char *decimal_point_pos.
> I thought that a pointer was an address in memory and I haven't
> seen a pointer in a if-statement like that before.

That's a common idiom.  NULL is zero and zero is false.
Anything else is nonzero and therefore true.

> I guess I have to write my own conversion-function.

Good luck with that (I still think a bug in the program and
not in GLib is the most probable cause).

Yeti

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