[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Лъчезар Георгиев]

To add some later findings, it turned out that:
(1) The bug was reintroduced in version 8.3;
(2) It affects only some CPU architectures.
I tested version "Debian 8.3.1-1" on two 64-bit machines with the same version 
of Debian (Sid), one with PowerPC, and the other with SPARC. The bug shows up 
only on the SPARC machine, not the PowerPC one. I then built the generic 
version 8.3.1 on a 64-bit ARM machine. The bug didn't show up there. And then I 
built it on a 64-bit MIPS (big endian) machine, where the bug did show up. 
Repeated this with version 8.3. The bug showed up again. When I built the 
generic version 8.2.1 on the same MIPS machine, the bug didn't show up. A "diff 
-u gdb-8.2.1/gdb/tui gdb-8.3/gdb/tui" shows a lot of changes made in the TUI 
code of version 8.3 to add some colourisation to the TUI, and the bug was 
probably introduced during this process. Sorry that I can't help more to 
isolate the bug. But it's quite strange that it manifests itself only on 
x86-64, SPARC and MIPS, but not on ARM and PowerPC. I suppose that because of 
this, it will be rather hard to pinpoint.

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Title:
  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Лъчезар Георгиев]

Thank you very much for fixing it! Unfortunately, it's back in version
9.0.90.20200105-0ubuntu1 (tested on AMD64, Ubuntu 20.04). I tried to
downgrade to 8.3-0ubuntu1 and then even to 8.2.91.20190405-0ubuntu3. In
both cases the bug was there. It wasn't there in 8.1-0ubuntu3.2 (Ubuntu
18.04 LTS).

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Title:
  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Launchpad Bug Tracker]

This bug was fixed in the package gdb - 8.0-0ubuntu6

---
gdb (8.0-0ubuntu6) artful; urgency=medium

  * Fix build dependencies for the gdb64 build.

 -- Matthias Klose   Fri, 01 Sep 2017 09:00:04 +0200

** Changed in: gdb (Ubuntu)
   Status: New => Fix Released

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Title:
  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Лъчезар Георгиев]

I managed to build from source code a gdb which correctly shows Cyrillic
characters (and probably all other UTF-8 encoded characters which the
console font supports) in the source code window. But in order to write
an acceptable gdb patch, I would need to study the configuration
scripts, which isn't easy. So, for now, may the following information be
useful to anyone who would like to build their own gdb which correctly
displays UTF-8 encoded characters in the source code window.

In order to do this, gdb needs to be:

1) patched so that instead of the "ncurses" headers and library, it uses
the wide-character "ncursesw", which decodes the UTF-8 encoded multi-
byte characters correctly.

2) configured with --enable-tui and --with-curses switches, among the
other eventually needed switches (the existing ones can be examined with
the "show config" gdb command, and then applied to "configure". Sure,
several needed additional packages will have to be installed, too).

To accomplish (1), I wrote the following "slow and dirty" script which
changes many more occurrences of "ncurses" than necessary, but surely
changes also those that really need to be changed, among them:

# Please be patient: this script is very slow!
find gdb -type f | xargs sed -si 's/ncurses/ncursesw/g'
find gdb -type f | xargs sed -si 's|ncursesw/ncursesw|ncursesw/curses|g'

It's written for the case when "sudo apt-get install gdb-source" is
executed to get the current gdb source archive, which is then extracted.
If extracting another archive with some other top level directory name,
the "gdb" in the above script must be changed to match that name.

Hope this helps, and once again, sorry that at least at the moment I
can't provide a good patch. By the way, the bug is fixed in FreeBSD-11,
albeit its gdb is an older version (6.1.1). If someone could find their
patch that accomplished this, that would be even more helpful. But, as I
wrote, it would be a patch against version 6.1.1, so it would probably
need to be edited for the newer one. Why this new release of FreeBSD
uses an old gdb version? I don't know, ask them.

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Title:
  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Eldar Khayrullin]

** Changed in: gdb (Ubuntu)
   Status: Expired = New

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Title:
  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Launchpad Bug Tracker]

[Expired for gdb (Ubuntu) because there has been no activity for 60
days.]

** Changed in: gdb (Ubuntu)
   Status: Incomplete = Expired

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Title:
  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Eldar Khayrullin]

Must be:
#include stdio.h

int main()
{
printf(Привет Мир\n);
return 0;
}

Current:
#include stdio.h

int main()
{
printf(M-P~_M-Q~@M-PM-8M-PM-2M-PM-5M-Q~B M-P~\M-PM-8M-Q~@\n);
return 0;
}

The russian text is not displayed correctly.

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Title:
  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Eldar Khayrullin]

$ file main.c
main.c: C source, UTF-8 Unicode text

(gdb) show charset
The host character set is auto; currently UTF-8.
The target character set is auto; currently UTF-8.
The target wide character set is auto; currently UTF-32.

Enter text:
-with TUI
(gdb) M-PM-?M-Q~@M-PM-8M-PM-2M-PM-5M-Q~B   // currently
-without TUI
(gdb) привет
// must be

Without TUI
(gdb) list main.c:1
1   #include stdio.h
2   
3   int main()
4   {
5   printf(Привет Мир\n); 
 // correctly
6   return 0;
7   }

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Title:
  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Eldar Khayrullin]

Ubuntu 14.10

GNU gdb (Ubuntu 7.8-1ubuntu4) 7.8.0.20141001-cvs
Copyright (C) 2014 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later http://gnu.org/licenses/gpl.html
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type show copying
and show warranty for details.
This GDB was configured as x86_64-linux-gnu.

┌──main.cpp─┐
   │1   #include stdio.h  
  │
   │2   
  │
   │3   int main()  
  │
   │4   {   
  │
   │5   printf(M-P~_M-Q~@M-PM-8M-PM-2M-PM-5M-Q~B 
M-P~\M-PM-8M-Q~@\n);   
│
   │6   return 0;   
  │
   │7   }

** Changed in: gdb (Ubuntu)
   Status: Invalid = New

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  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Matthias Klose]

repeating the issue here is not good enough. please could you state what
is supposed to be wrong, and what you would expect?

** Changed in: gdb (Ubuntu)
   Status: New = Incomplete

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  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Matthias Klose]

closing this rather old issue. sorry for not addressing this earlier.
Please could you recheck with the recent 14.04 LTS or 14.10 releases and
reopen the issue if the problem persists?

** Changed in: gdb (Ubuntu)
   Status: New = Invalid

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  gdbtui does not give input and show cyrillic symbols

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[Bug 1275210] Re: gdbtui does not give input and show cyrillic symbols

[Eldar Khayrullin]

main.c

** Attachment added: main.c
   
https://bugs.launchpad.net/ubuntu/+source/gdb/+bug/1275210/+attachment/3965035/+files/main.c

** Description changed:

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┌──main.c─┐
-│1   #include stdio.h
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-│3   int main()
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-│4   { 
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-│5   printf(M-P~_M-Q~@M-PM-8M-PM-2M-PM-5M-Q~B 
M-P~\M-PM-8M-Q~@\n);  │
-│6   return 0; 
   │
-│7   } 
   │
-│8 
   │
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