[PATCH] Cygwin: pty: Add workaround for ISO-2022 and ISCII in convert_mb_str().

[Corinna Vinschen]

On Sep 12 01:05, Takashi Yano via Cygwin-patches wrote:
> On Fri, 11 Sep 2020 16:06:01 +0200
> Corinna Vinschen wrote:
> > On Sep 11 21:35, Takashi Yano via Cygwin-patches wrote:
> > > What do you mean by "just drop any handling"? 
> > > 
> > > Do you mean remove following if block?
> > > > > +  if (cp_from == CP_UTF7 || IS_ISO_2022 (cp_from) || IS_ISCII (cp_from))
> > > > > +    /* - MB_ERR_INVALID_CHARS does not work properly for UTF-7.
> > > > > +       - ISO-2022 is too complicated to handle correctly.
> > > > > +       - FIXME: Not sure what to do for ISCII.
> > > > >         Therefore, just convert string without checking */
> > > > >      wlen = MultiByteToWideChar (cp_from, 0, ptr_from, len_from,
> > > > >  				wbuf, NT_MAX_PATH);
> > > In this case, the conversion for ISO-2022, ISCII and UTF-7 will
> > > not be done correctly.
> > > 
> > > Or skip charset conversion if the codepage is EBCDIC, ISO-2022
> > > or ISCII? What should we do for UTF-7?
> > 
> > Nothing, just like for any other of these weird charsets.  Cygwin never
> > supported any charset which wasn't at least ASCII compatible in the
> > 0 <= x <= 127 range.  Just ignore them and the possibility that a
> > user chooses them for fun.
> > 
> > > What should happen if user or apps chage codepage to one of them?
> > 
> > Garbage output, I guess.  We shouldn't really care.
> 
> Do you mean a patch attached?

Yes.  I pushed it.  We should really not care for them.


Thanks,
Corinna