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Re: Invisible form fields w/ ncurses-5.7 on Fedora


From: Grant Edwards
Subject: Re: Invisible form fields w/ ncurses-5.7 on Fedora
Date: Fri, 12 Aug 2011 23:05:51 +0000 (UTC)
User-agent: slrn/pre0.9.9-102 (Linux)

On 2011-08-12, Thomas Dickey <address@hidden> wrote:
> On Fri, 12 Aug 2011, Grant Edwards wrote:
>> On 2011-08-12, Grant Edwards <address@hidden> wrote:
>>
>>> I'm sure it's something I'm doing wrong in my application, but I can't
>>> figure out what it might be.
>>
>> Doh!  After beating my head against the wall for a day and a half, it
>> only takes 5 miutes after posting to stumble across the problem.
>>
>> There was a type in my code:
>>
>>   w = newwin(rows,cols,y,x);                     assert(w);
>>   s = derwin(w,rows-2,cols-2,1,1);               assert(s);
>>   set_form_win(f,w);
>>   set_form_win(f,s);
>>
>> That second set_form_win() call should have been set_form_sub().
>>
>> I've no clue why my broken code worked for so long on so many systems
>> and just recently failed only on Fedora systems.
>
> perhaps just different memory layout.  I come across very old bugs 
> periodically, and wonder how they escaped notice for so long.  I don't 
> recall anything special about set_form_win - looking at the change 
> history, I see that I made a macro substitution in this code in 2009/11/07 
> - and somewhat earlier in 2009 was working to merge Juergen's changes, 
> that affected the internals.  So if your two "5.7" versions fell on each 
> side of that timespan, then there might be some breakage for me to 
> investigate.

I assume that the version with two set_form_win() calls wouldn't be
expected to work, so I don't think there's anything that really needs
to be investigated.  But, if you'd like I can track down the details
for the two different "5.7" libraries.

FWIW, on the Fedora system (where my old code didn't work), it behaved
the same way with 5 different terminals (gnome, aterm, xterm, rxvt,
Eterm): when the "form" was displayed the cursor was visible and just
sat on the upper-left-hand border of the form dialog window until I
hit the key that took down the form dialog.

Changing the second set_form_win() call to set_form_sub() makes it
work as expected everywhere.

-- 
Grant Edwards               grant.b.edwards        Yow! I'm rated PG-34!!
                                  at               
                              gmail.com            




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