Re: [Vala] Seg Fault when using printf function

[Steven Oliver <oliver steven gmail com>]

I apologize for the delay, but the bug has been submitted.

https://bugzilla.gnome.org/show_bug.cgi?id=791973
Steven N. Oliver


On Mon, Dec 11, 2017 at 7:13 AM, Daniel Espinosa <esodan gmail com> wrote:
> Could you file a bug report in bugzilla in order to trace it up to fix it?
>
> El 27/11/2017 1:25 a.m., "Steven Oliver" <oliver steven gmail com> escribió:
> > Hello,
> > I recently upgraded my OS to Ubuntu 17.10 from 16.04 and I think I've
> > discovered a bug in Vala.
> >
> > This commit is now causing my application to crash:
> >
> > https://github.com/steveno/balistica/commit/061a28e98f3c4468b4465e580ada78f11eec4461?diff=unified
> >
> > I don't understand what changed in that commit that breaks the
> > application with my version of Vala versus the one I had on 16.04, but
> > I managed to trace it down to two lines (511 & 513) in
> > src/balistica_application.vala (which aren't changed in the diff !!).
> > If you comment out those two lines it will compile and produce the
> > drag calculation as expected.
> >
> > I also figured out that if you change those two lines so that the
> > printf functions don't format more than two entries, it will also
> > compile and produce the expected output. With a third entry, though,
> > it seg faults trying to print the calculation results.
> >
> > Will Seg Fault:
> > txtViewDragResults.buffer.text += ("Initial Velocity: %.2f ft/s Zero
> > Range: %.2f yards Shooting Angle: %.2f degrees\n").printf (lsln.getMv
> > (), lsln.getZerorange (), lsln.getAngle ()) ;
> >
> > Will print as expected:
> > txtViewDragResults.buffer.text += ("Initial Velocity: %.2f ft/s Zero
> > Range: %.2f yards\n").printf (lsln.getMv (), lsln.getZerorange ()) ;
> >
> > I have attached the C code that is generated.
> >
> > Hopefully that wasn't to confusing. Anyone have any thoughts? Suggestions?
> >
> > Steven N. Oliver
> >
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