AW: Glitch after system start

[Hohl, Gerrit]

Good morning Thomas,

ah, okay. It's interesting that it is working most of the time, but sometimes 
not recognized by the terminal.
But it sounds like I can't do much against it on my side. :(
Anyway thank you very much for the information. :)

Regards,
Gerrit

-----Ursprüngliche Nachricht-----
Von: Thomas Dickey [mailto:address@hidden 
Gesendet: Freitag, 3. Juli 2015 18:31
An: Hohl, Gerrit
Cc: address@hidden
Betreff: Re: Glitch after system start

----- Original Message -----
| From: "Gerrit Hohl" <address@hidden>
| To: address@hidden
| Sent: Friday, July 3, 2015 11:24:23 AM
| Subject: Glitch after system start
| 
| 
| 
| 
| 
| Hello everyone,
| 
| 
| 
| I have a setup program written in Java based on Java Curses Library 
| which is based on NCurses.
| 
| The setup program is executed at the boot time of an Ubuntu Linux.
| 
| Most of the time everything works fine, but sometimes I get odd 
| characters.
| 
| 
| 
| Some of them occurred while some services where still starting in the 
| background and produces some output.
| 
| I could solve that using the Linux kernel parameter "console=tty7".
| 
| 
| 
| But now I'm still facing a problem - at least from time to time as it 
| doesn't appear all the time. I get a [79G in the upper left corner 
| followed by a vertical line (ASCII block graphic). And after that the 
| Java Curses Library / NCurses draws everything the right way, even the 
| width is okay (in this case it's the border of window which is drawn. 
| The upper left corner is right in the upper left corner of the screen 
| [0, 0]).

It sounds as if the terminal is not honoring CHA:

http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
    CSI Ps G  Cursor Character Absolute  [column] (default = [row,1]) (CHA).
http://man7.org/linux/man-pages/man4/console_codes.4.html
    G   CHA       Move cursor to indicated column in current row.

http://invisible-island.net/ncurses/terminfo.src.html#tic-xterm-basic
    hpa=\E[%i%p1%dG,


| 
| So it should like this (hopefully it will be shown correctly in your 
| mail client):
| 
| ┌────────┐
| 
| │ │
| 
| │ │
| 
| │ │
| 
| └────────┘
| 
| 
| 
| But looks like that:
| 
| [79G│────┐
| 
| │ │
| 
| │ │
| 
| │ │
| 
| └────────┘
| 
| While the window and the border has a gray background and a black 
| foreground, that characters have a black background and a gray 
| foreground.
| 
| 
| 
| I looked in the Internet for that sequence [79G, but couldn't find any 
| information about it (because it looks like a console code).
| 
| 
| 
| Does anyone of you know what that [79G means?
| 
| If I would know what it means I maybe could track down the problem.
| 
| 
| 
| Regards,
| 
| Gerrit
| 
| 
| _______________________________________________
| Bug-ncurses mailing list
| address@hidden
| https://lists.gnu.org/mailman/listinfo/bug-ncurses
| 

--
Thomas E. Dickey <address@hidden> http://invisible-island.net 
ftp://invisible-island.net