[FFmpeg-devel] [PATCH] rmdec: avoid leaving st unitialized

[Reimar Döffinger]

On Sun, Jun 06, 2010 at 01:03:20PM -0400, Ronald S. Bultje wrote:
> Hi,
> 
> On Sun, Jun 6, 2010 at 6:57 AM, Reimar D?ffinger
> <Reimar.Doeffinger at gmx.de> wrote:
> > this fixes a warning with my gcc version, and I think it even fixes a bug:
> > Index: rmdec.c
> > ===================================================================
> > --- rmdec.c ? ? (revision 23501)
> > +++ rmdec.c ? ? (working copy)
> > @@ -843,7 +844,7 @@
> > ? ? ? ? ? ? ? ? pos = url_ftell(s->pb);
> > ? ? ? ? ? ? } else {
> > ? ? ? ? ? ? ? ? len=sync(s, &timestamp, &flags, &i, &pos);
> > - ? ? ? ? ? ? ? ?if (len > 0)
> > + ? ? ? ? ? ? ? ?if (len >= 0)
> > ? ? ? ? ? ? ? ? ? ? st = s->streams[i];
> > ? ? ? ? ? ? }
> >
> >
> > The next line below this reads:
> > ? ? ? ? ? ?if(len<0 || url_feof(s->pb))
> > ? ? ? ? ? ? ? ?return AVERROR(EIO);
> > so >= 0 fits with this condition, and other places treat a 0 value
> > from "sync" as ok.
> 
> sync() can not return zero (I've looked at this a couple of times in
> the past because the gcc warning annoyed me at some point). So the
> patch silences a warning but in reality, it doesn't do anything.

ok, no bug, but that still leaves a compiler warning and that there's
no point to treat 0 once this way once the other way...
And if you "looked at this a couple of times" there's also obviously
the point that it obviously wastes developer time the way it is now.