Re: [Qemu-devel] [PATCHv3 1/2] ui/curses: Do not assume wchar_t contains unicode

[Samuel Thibault <samuel.thibault@gnu.org>]

Kamil Rytarowski, le sam. 27 avril 2019 19:36:40 +0200, a ecrit:
> On 27.04.2019 18:30, Samuel Thibault wrote:
> > E.g. BSD and Solaris even use locale-specific encoding there.
> > 
> > We thus have to go through the native multibyte representation and use
> > mbtowc/wctomb to make a proper conversion.
> > 
> > Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
> 
> Both patches work for me on NetBSD/amd64 8.99.37 for qemu-system-x86_64.
> Borders are printed correctly.
> 
> Regarding the patch I'm not sure whether to use MB_LEN_MAX or MB_CUR_MAX?

I don't know if qemu can afford VLA?

> I'm also unsure whether to reset conversion state between a multibyte
> character and wide character, with: `mbtowc(NULL, 0, 0);`. It's
> recommended to use in code examples examples. I think it doesn't make
> any harm to use it.

Mmm, better yet, we should actually use mbrtowc and wcrtomb. I have
fixed this in my tree.

> I'm not sure if this is related, but "qemu-system-hppa -curses" is
> broken for me. I didn't use it in the past as it just recently acquired
> NetBSD guest support.
> 
> (lldb) bt
> libcurses.so.7`mvwadd_wchnstr(win=0x0000000000000000, y=<unavailable>,
> x=<unavailable>, wchstr=0x00007f7fffffe020, n=0) at add_wchstr.c:123
>   * frame #2: 0x000000000078629e
> qemu-system-hppa`curses_update(dcl=0x00007f7ff7bd8bc0, x=0, y=0, w=79,
> h=24) at curses.c:86:9
>     frame #3: 0x0000000000753dae
> qemu-system-hppa`dpy_text_update(con=0x00007f7ff7bae580, x=0, y=0, w=79,

> (lldb) p screenpad
> (WINDOW *) $2 = 0x0000000000000000

I don't think this is related at all, screenpad management is another
matter.

Samuel