Re: [PATCH 3/4] vbscript: Implemented Sgn(try 2)

[Shuai Meng]

2014-06-25 0:50 GMT+08:00 Jacek Caban :
> On 06/24/14 15:59, Shuai Meng wrote:
>
> 2014-06-19 8:30 GMT+08:00 Shuai Meng :
> > 2014-06-17 17:43 GMT+08:00 Jacek Caban :
> >
> > On 06/17/14 07:59, Shuai Meng wrote:
> > > > diff --git a/dlls/vbscript/global.c b/dlls/vbscript/global.c
> > > > index c2b2edd..d21784d 100644
> > > > --- a/dlls/vbscript/global.c
> > > > +++ b/dlls/vbscript/global.c
> > > > @@ -1320,8 +1320,24 @@ static HRESULT Global_Int(vbdisp_t *This,
> > >
> > > VARIANT *arg, unsigned args_cnt, VARIA
> > > > static HRESULT Global_Sgn(vbdisp_t *This, VARIANT *arg, unsigned
> > >
> > > args_cnt, VARIANT *res)
> > > > {
> > > > - FIXME("\n");
> > > > - return E_NOTIMPL;
> > > > - VARIANT v;
> > > > - HRESULT hres;
> > > > -
> > > > - TRACE("(%s)\n", debugstr_variant(arg));
> > > > -
> > > > - assert(args_cnt == 1);
> > > > -
> > > > - V_VT(&v) = VT_EMPTY;
> > > > - hres = VariantChangeType(&v, arg, VARIANT_LOCALBOOL, VT_R8);
> > > > -
> > > >    if (FAILED(hres))
> > > > -
> > > >        return S_OK;
> > >
> > > Please use to_double() instead. to_double may need some fixes (it may
> > > require similar changes as you did for to_string first).
> > >
> > > Yes, to_double is better and simpler.
> > > Jacek
> >
> > I have tried to_double, but I don't think it is as convenient as
>
> VariantChangeType.
>
> Not if you fix to_double first. Just call VariantChangeType inside
> to_double, like you did in to_string:

Thank you, but when I use git blame, it turns out that it's you modify
to_string, not me :)
> http://source.winehq.org/git/wine.git/commitdiff/6bef4da592c8be4857dc0fa179a...
>
> I have to add more types such as VT_CY and VT_EMPTY, and they don't
> work. For example, if
>   185     switch(V_VT(v)) {
>  186     case VT_EMPTY:
>  187         *ret = VT_EMPTY(v);
>
> but there is no VT_EMPTY(), how can I give ret whose type is double a
> "EMPTY" value?
>
> Well... of course there is no. As the name suggests, the type "empty" is
> empty and has no values ;) What will be result of converting empty to
> double is a matter of language semantic and vbscript happens to have the
> same semantic as VT_EMPTY->VT_R8 conversion in VariantChangeType.
>
> Why must we pick up to_double and give up VariantChangeType?
>
> I'm not saying about giving up VariantChangeType, I just want to use it
> right.
>
> Jacek