Re: XLookupString return inconsistent

2016-09-30 Thread wettstae 
> So there's no way to work around this?

I can think of three:

- You have two Shift keys and most likely two Mod4 keys.  This gives you
  three more possibilities to enter the same combination.  If any of
  this combinations works and is sufficiently convenient to type, that
  would be the easiest workaround.

- You could use another physical key for Mod4.  For example, you could
  swap the right Mod4 with the Menu key.

- You could use a XKB feature called "latches".  These are like
  modifiers that remain "pressed" until you hit the next non-modifier
  key.  For example, with a Mod4-latch, you could first press and
  release Mod4, then enter Shift+2 to give Mod4+Shift+2 overall.  I
  never really used latches, and I suspect they take some time to get
  used to.

Andreas


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Re: XLookupString return inconsistent

2016-09-29 Thread martin f krafft 
also sprach wetts...@gmail.com  [2016-09-29 21:00 +0200]:
> I do not know, but I do not see the benefit of doing that.  It
> certainly would not fix your problem, which I still think is
> hardware.

I think you are right. I just noticed that this only happens with my
USB keyboards, not with the Thinkpad built-in keyboard.

So there's no way to work around this?

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 sondern um besser zu glänzen."
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Re: XLookupString return inconsistent

2016-09-29 Thread wettstae 
> Long story short: do you see any chance in making this bit of
> legacy (nostalgia?) code configurable, or remove it altogether?

I do not know, but I do not see the benefit of doing that.  It certainly
would not fix your problem, which I still think is hardware.

Andreas



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Re: XLookupString return inconsistent

2016-09-29 Thread martin f krafft 
also sprach wetts...@gmail.com  [2016-09-12 18:01 +0200]:
> > And moments after clicking send, I realized this is really just hardcoding
> > US keyboard layout & ASCII encoding - Shift-2 is '@' and Ctrl-@ is '\0'.
> 
> Oh, yes.  And Ctrl+3-7 get mapped to 0x1b-0x1f, the control codes beyond
> Ctrl-Z.  Ctrl+8 becomes 0x7f, that is, ASCII DEL.  So the full ASCII
> range becomes available.  It does make sense, from a perspective of text
> terminals.

Hey guys, sorry for the late response to "my" thread.

So this makes sense from the perspective of text terminals, but we
are talking X.org here, aren't we? ;)

Long story short: do you see any chance in making this bit of
legacy (nostalgia?) code configurable, or remove it altogether?

Cheers,

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Re: XLookupString return inconsistent

2016-09-12 Thread wettstae 
> And moments after clicking send, I realized this is really just hardcoding
> US keyboard layout & ASCII encoding - Shift-2 is '@' and Ctrl-@ is '\0'.

Oh, yes.  And Ctrl+3-7 get mapped to 0x1b-0x1f, the control codes beyond
Ctrl-Z.  Ctrl+8 becomes 0x7f, that is, ASCII DEL.  So the full ASCII
range becomes available.  It does make sense, from a perspective of text
terminals.

Andreas
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Re: XLookupString return inconsistent

2016-09-12 Thread Alan Coopersmith 

On 09/12/16 08:40 AM, Alan Coopersmith wrote:

So Control-Shift-2 maps to the NULL character because someone three decades
ago thought it useful to emulate a text terminal popular in that decade.


And moments after clicking send, I realized this is really just hardcoding
US keyboard layout & ASCII encoding - Shift-2 is '@' and Ctrl-@ is '\0'.

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Re: XLookupString return inconsistent

2016-09-12 Thread Alan Coopersmith 

On 09/12/16 08:25 AM, wetts...@gmail.com wrote:

Do you have any idea what might be going on?


In libX11, file KeyBind.c, function _XTranslateKeySym, there is the
following piece of code:

/* only apply Control key if it makes sense, else ignore it */
if (modifiers & ControlMask) {
if ((c >= '@' && c < '\177') || c == ' ') c &= 0x1F;
else if (c == '2') c = '\000';
else if (c >= '3' && c <= '7') c -= ('3' - '\033');
else if (c == '8') c = '\177';
else if (c == '/') c = '_' & 0x1F;
}

I have no clue what the "sense" is the comment speaks about, but
clearly, the weird behaviour you see was intended.


The comment from 1987 seems to have originally referred to the mapping of
ASCII characters 0x40 through 0x5F into the ASCII control character range
of 0x0 through 0x1F:

https://cgit.freedesktop.org/~alanc/xc-historical/commit/xc/lib/X11/KeyBind.c?id=0aecc4f21449050657ce34f7599d383e14fcdf40

The handling of the number keys was added the next year with a comment
about doing things vt200 style:

https://cgit.freedesktop.org/~alanc/xc-historical/commit/xc/lib/X11/KeyBind.c?id=f2485bc25a7394fbd830cd60108b220319dbcb7d

So Control-Shift-2 maps to the NULL character because someone three decades
ago thought it useful to emulate a text terminal popular in that decade.

--
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 Oracle Solaris Engineering - http://blogs.oracle.com/alanc
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