Re: japanese print

[Thomas Dickey]

On Mon, 13 Sep 2010, ?~]??~U~Y?~D? wrote:

>  I compiled following source printing japanese and linked with libcursesw
> 5.7 library.
> The First and second print was displayed well.
> But the third print was broken.
> What should I do to print the third well?

The third case breaks because of the cursor-movement.

After 5.3, I (re)wrote the handling of multibyte/multicolumn characters,
to make it work with UTF-8.  Shift-JIS, by the way, is a different
encoding.  Probably in 5.3 it just "happened" to appear as if it worked.
Repainting would be a different matter.

Your program is attempting to print a multibyte character byte-by-byte.
However, it is positioning each byte on a new column.

UTF-8 encoding isn't like that - its individual bytes are all associated 
with the starting column of the character.

ncurses keeps a small amount of state to see if the cursor is moved via 
mv-functions to anywhere but the expected location (seems that I did all 
of this after 5.3).  If that happens, it treats the partly built-up 
multibyte character as just 8-bit junk, and prints it as you see.

Printing multibyte characters byte-by-byte is an ncurses extension vs 
X/Open. The standard (X/Open) way is more cumbersome, e.g., using add_wch 
which requires a type-conversion to cchar_t's, or using addwnstr (again, a 
type conversion).

> On linking with libcurses 5.3 library, all are displayed well.
>
>
> #include <ncurses.h>
> #include <locale.h>
>
>
>
> int main()
> {
>     int i;
>     char japanese[]="????????????";
>
>     setlocale(LC_ALL,"");
>     initscr();
>
>
>
>     /* first print */
>     mvprintw(1,0,"%s\n",japanese);
>
>
>
>     /* second print */
>     for(i=0;i<8;i++)
>         printw("%c",japanese[i]);
>
>
>
>     /* third print */
>     for(i=0;i<9;i++)
>         mvprintw(3,i,"%c",japanese[i]);
>
>
>
>     refresh();
>     sleep(10);
>     endwin();
>
>     return 0;
> }
>
>
> Following is my current environment.
>
> - emulator : putty ( Character set translation: Use font encoding, Font:
> MS Gothic, Script: Japanese)
> - termianl : xterm
> - locale
> LANG=ja_JP.shiftjis
> LC_CTYPE="ja_JP.shiftjis"
> LC_NUMERIC="ja_JP.shiftjis"
> LC_TIME="ja_JP.shiftjis"
> LC_COLLATE="ja_JP.shiftjis"
> LC_MONETARY="ja_JP.shiftjis"
> LC_MESSAGES="ja_JP.shiftjis"
> LC_PAPER="ja_JP.shiftjis"
> LC_NAME="ja_JP.shiftjis"
> LC_ADDRESS="ja_JP.shiftjis"
> LC_TELEPHONE="ja_JP.shiftjis"
> LC_MEASUREMENT="ja_JP.shiftjis"
> LC_IDENTIFICATION="ja_JP.shiftjis"
> LC_ALL=
>
>
>
> I attached original source file.
>
> Thank you.
>
> [?usn=1948988&address@hidden&key=fad08084ff719d1902deb6e5cc3471f7$2c4b3
> address@hidden

--
Thomas E. Dickey
http://invisible-island.net
ftp://invisible-island.net