Re: vt and keyboard accents

On Sun, Jan 29, 2023 at 10:16 AM Hans Petter Selasky <hps@selasky.org>
wrote:

> On 1/29/23 01:54, Yuri wrote:
> > Looking into an issue with accents input for vt and cz (so
> > /usr/share/vt/keymaps/cz.kbd) keyboard where some of the accents are
> > working and other result weird unrelated characters output.
> >
> > Checking kbdcontrol -d output, there is an obvious difference with
> > keymap contents -- all mappings are trimmed down to 1 byte after reading:
> >
> > kbdcontrol:
> >    dacu  180  ( 180 180 ) ( 'S' 'Z' ) ( 'Z' 'y' ) ( 's' '[' )
> >               ( 'z' 'z' ) ( 'R' 'T' ) ( 'A' 193 ) ( 'L' '9' )
> >               ( 'C' 006 ) ( 'E' 201 ) ( 'I' 205 ) ( 'N' 'C' )
> >               ( 'O' 211 ) ( 'U' 218 ) ( 'Y' 221 ) ( 'r' 'U' )
> >               ( 'a' 225 ) ( 'l' ':' ) ( 'c' 007 ) ( 'e' 233 )
> >               ( 'i' 237 ) ( 'n' 'D' ) ( 'o' 243 ) ( 'u' 250 )
> >               ( 'y' 253 )
> >
> > keymap:
> >    dacu 0xb4    ( 0xb4   0xb4    ) ( 'S'    0x015a  ) ( 'Z'    0x0179  )
> > ( 's'    0x015b  )
> >                 ( 'z'    0x017a  ) ( 'R'    0x0154  ) ( 'A'    0xc1    )
> > ( 'L'    0x0139  )
> >                 ( 'C'    0x0106  ) ( 'E'    0xc9    ) ( 'I'    0xcd    )
> > ( 'N'    0x0143  )
> >                 ( 'O'    0xd3    ) ( 'U'    0xda    ) ( 'Y'    0xdd    )
> > ( 'r'    0x0155  )
> >                 ( 'a'    0xe1    ) ( 'l'    0x013a  ) ( 'c'    0x0107  )
> > ( 'e'    0xe9    )
> >                 ( 'i'    0xed    ) ( 'n'    0x0144  ) ( 'o'    0xf3    )
> > ( 'u'    0xfa    )
> >                 ( 'y'    0xfd    )
> >
> > Source of the problem is the following definition in sys/sys/kbio.h:
> >
> > struct acc_t {
> >          u_char          accchar;
> >          u_char          map[NUM_ACCENTCHARS][2];
> > };
> >
> > While the keymaps were converted to have the unicode characters for vt
> > in the commit below, the array to store them (map) was missed, or was
> > there a reason for this?
> >
> > ---
> > commit 7ba08f814546ece02e0193edc12cf6eb4d5cb8d4
> > Author: Stefan Eßer <se@FreeBSD.org>
> > Date:   Sun Aug 17 19:54:21 2014 +0000
> >
> >      Attempt at converting the SYSCONS keymaps to Unicode for use with
> > NEWCONS.
> >      I have spent many hours comparing source and destination formats,
> > and hope
> >      to have caught the most severe conversion errors.
> > ---
> >
> > I have tried the following patch and it allows me to enter all accents
> > documented in the keymap, though I must admit I'm not sure it does not
> > have hidden issues:
> >
> > diff --git a/sys/sys/kbio.h b/sys/sys/kbio.h
> > index 7f17bda76c5..fffeb63e226 100644
> > --- a/sys/sys/kbio.h
> > +++ b/sys/sys/kbio.h
> > @@ -200,7 +200,7 @@ typedef struct okeymap okeymap_t;
> >
> >   struct acc_t {
> >          u_char          accchar;
> > -       u_char          map[NUM_ACCENTCHARS][2];
> > +       int             map[NUM_ACCENTCHARS][2];
> >   };
> >
>
> Hi,
>
> Using "int" for unicode characters is probably good for now. Your patch
> looks good, but please also consider the "umlaut" case while at it
> (multiple characters that become one)!
>
> --HPS
>
>


I am not an expert on UNICODE .

When character sets are considered , a homogeneous definition for all of
the FreeBSD system would be more useful .
There are mainly three types of Unicode : UTF-8 , UTF-16 , and UTF-32 where
numbers are bit sizes of the characters .


Some pages about Unicode where they have many linked sub pages :



https://en.wikipedia.org/wiki/Category:Unicode
Category:Unicode


https://en.wikipedia.org/wiki/Unicode
Unicode

https://en.wikipedia.org/wiki/Comparison_of_Unicode_encodings
Comparison of Unicode encodings

https://en.wikipedia.org/wiki/List_of_binary_codes
List of binary codes


https://en.wikipedia.org/wiki/List_of_information_system_character_sets
List of information system character sets


and other related pages ...


With my best wishes for all .


Mehmet Erol Sanliturk