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Message-ID:	<5374B8EA.5080801@shaddybaddah.name>
Date:	Thu, 15 May 2014 22:54:02 +1000
From:	Shaddy Baddah <lithium-cygwin AT shaddybaddah DOT name>
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To:	cygwin AT cygwin DOT com
Subject:	Re: screen on 64-bit mangles mintty/buffer
References:	<5370E144 DOT 4010905 AT shaddybaddah DOT name> <90t1n9l4g51dgrq060rc6ua48eog4178v8 AT 4ax DOT com> <5373AF2E DOT 5090402 AT shaddybaddah DOT name> <20140515071745 DOT GI2436 AT calimero DOT vinschen DOT de>
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Hi Corinna,


On 2014-05-15 17:17+1000, Corinna Vinschen wrote:
>
>
> Nice detective work, really.  The goldstar is well deservered :)
>
> On May 15 04:00, Shaddy Baddah wrote:
>> I quickly worked out that the code has a bug for "%i". At some point
>> the code was changed to push and pop the parameters being passed (0 and
>> 39 in my eg.). However, the "%i" select/case block was incrementing the
>> arguments in a no longer used array for parameters:
>>
>>
>> 	    case 'i':
>> 		if (p_is_s[0] == 0)
>> 		    param[0]++;
>> 		if (p_is_s[1] == 0)
>> 		    param[1]++;
>> 		break;
>
> Unfortunately there's no newer upstream release and this bug is present
> in the ncurses 5.9 version in Fedora 20 as well.  From what I gather from the
> surrounding code, I *assume* something like this could fix it
>
>              case 'i':
>                  y = npop();
>                  x = npop();
>                  if (p_is_s[0] == 0)
>                      y++;
>                  if (p_is_s[1] == 0)
>                      x++;
>                  npush(x);
>                  npush(y);
>                  break;
>
> I'm not sure the relation between x, y, and the p_is_s indices is
> correct, though.

Yes, that's the code that I thought of as well, and same, I'd have to
get my head around the exact order of p_is_s (unfortunate name), etc.

When you say the bug is present in ncurses 5.9, is there any application
that is directly affected? I ask as screen being affected was sort of a
fluke. It's configure script should have detected terminfo notation was
available for use, and used the equivalent entry for "cs".

So I'm wondering if there are many applications still out there that are
trying to use the older, more terse termcap form? And also linking in
with ncurses?

Seems unlikely, as I would have expected that if there were, and any
were using a cap entry with "%i" that there would have been obvious
presentation problems.

-- 
Regards.
Shaddy


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