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Message-ID:	<514B2CEF.3090100@cs.utoronto.ca>
Date:	Thu, 21 Mar 2013 11:53:19 -0400
From:	Ryan Johnson <ryan DOT johnson AT cs DOT utoronto DOT ca>
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MIME-Version:	1.0
To:	cygwin AT cygwin DOT com
Subject:	Re: mintty and Control-` , Control-~
References:	<CADd11yXqNrSfOEj4Lmf5KyVUL0TWkosEb=3yNprCyLLk_PK-iQ AT mail DOT gmail DOT com>
In-Reply-To:	<CADd11yXqNrSfOEj4Lmf5KyVUL0TWkosEb=3yNprCyLLk_PK-iQ@mail.gmail.com>

On 21/03/2013 11:30 AM, Igor Bukanov wrote:
> It seems that mintty in Cygwin under Windows-7 does not pass C-`
> (Control-backtick, in US keyboard this is the key above the tab) nor
> C-~ (or Control-Shift-backtick) to terminal applications. Any reason
> for that?
A quick test [3] in shortcut override mode [1] suggests that mintty 
never receives that key combination in the first place.

However, trying the same test in xterm, I get \000 and \036 for C-` and 
C-~, respectively. Neither of those seems to be correct [2] (\000 is ^@ 
and \036 is ^^), but it's still odd that xterm can receive key codes 
that mintty misses.

Maybe someone who knows more about terminals and key mappings can comment?

Ryan

[1] http://code.google.com/p/mintty/wiki/CtrlSeqs#Shortcut_override_mode
[2] http://en.wikipedia.org/wiki/ASCII#ASCII_control_code_chart
[3] $ cat echo-octets.c
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
int main(int argc, char const* argv[]) {
     unsigned char c;
     while(1 == read(0, &c, 1)) {
         if(isprint(c) && !isspace(c))
             fprintf(stderr, "   %c ", c);
         else
             fprintf(stderr, "\\%03o ", (int) c);
         if(c == '\n') fprintf(stderr, "%c", c);
     }
     return 0;
}


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