All,
I'm jumping lists with this; my apologies, but it's definitely a gtk bug
and so want to followup to gtk-list.
If I try to print a denormalized float with a specific format string,
e.g. "%6.2f\n", using g_string_sprintf(), the program crashes with an
error about allocating a negative number of bytes.
An example program is below, showing the error when compiled and run
under Linux. I believe that the problem is present in both 1.2.9 and
1.2.10.
If I change the format string to "%g\n", I get an answer that is
"something e-44", which is why I think that the denormalized is the
problem. On Solaris, I get "0.000", which is I believe the correct
response.
I think that I can work around this with additional testing, but I have
two questions:
1) Is there ongoing bugfix developement on 1.2.x GTK+?
2) Is this bug fixed in Gtk+ 2.0.x?
Eric Monsler
#include <gtk/gtk.h>
int main (int argc, char *argv[])
{
GString *pGStr;
union {
int i_val;
float f_val;
} the_data;
gtk_set_locale();
gtk_init(&argc,&argv);
the_data.i_val = 1;
pGStr = g_string_new("");
g_string_sprintf(pGStr,"%6.2f\n",the_data.f_val);
printf(pGStr->str);
}
Eric M. Monsler wrote:
> All,
>
> I am seeing a crash, although with GLib error message, when printing a
> floating point number.
>
> The error message is that GLib is unable to allocate -7 bytes. Which
> seems reasonable enough.
>
> The problem is that the data I am trying to print does not seem to be a
> valid floating point number. My program needs to be crash-proof in this
> case, as bad data is going to be encountered. I see that the value that
> is bad is typically something like "6.0245e-44", which is not valid.
>
> The fact that I can read the value means that ddd/gdb is handling it
> properly, but not g_string_sprintf.
>
> Any clues? Any suggestions as to how to clamp the floating point value?
> I have tried to do so with comparisons to MAX_FLT and MIN_FLT, without
> success.
>
> As an aside, the problem has never been observed when using the Solaris
> version of the program, just the Linux one.
>
> Thanks in advance,
>
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