Re: Issue with Slackware build of ncurses and tvi910 terminfo entry

Thomas Dickey <[email protected]> Sat, 16 May 2026 12:49:17 -0400

Newsgroups	gmane.comp.lib.ncurses.bugs
Message-ID	<[email protected]>

On Fri, May 15, 2026 at 03:59:32AM -0400, Thomas Dickey wrote:
> On Fri, May 15, 2026 at 12:13:25AM -0400, Frank Palazzolo wrote:
> > Hello,
> > 
> > I discovered NCURSES_NO_MAGIC_COOKIE, which lets me workaround the issue
> > without having to recompile the library!
> > 
> > Given that, I decided to write some python to determine which other TERM
> > types might be affected.  I tested the sample code with all the terminal
> > types in an 80x24 window on Slackware64-15.0
> > 
> > There are 95 terminal types which give a much larger output when
> > running with magic cookie support turned on, and they all have a xmc entry
> > in terminfo.  (See table 1 for the numbers)

The basic reason for the larger output is that when initializing for
magic cookies, I disabled the clear-display capability (to limit the
types of optimization available).

I can improve this by deferring the optimization-limitation until
it's actually needed: when a cell is written using one of the video
attributes.  That would make your testcase work better, though as
I mentioned, the optimization with magic cookies was never satisfactory.

-- 
Thomas E. Dickey <[email protected]>
https://invisible-island.net

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