[Caml-list] [Early announce] Text Mode Kit

[Caml-list] [Early announce] Text Mode Kit

[Nicolas George]

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Some weeks ago (who said "months"?), someone asked for a text mode
widget system, and I said that I had started such a project, and that I
would publish it in a few days. For a correct meaning of "few", this is
done.

http://savannah.gnu.org/projects/ocaml-tmk/

I have tested it under Linux/i586 and Solaris/sparc, and the part that
is done works.

The roadmap is now:

- fix a strange bug with dynamic loading (see this list soon)

- write a configuration ad build system

- implement more widgets

Remarks (and help) are welcome.

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[Caml-list] Strange bug with dynamic loading (was: Text Mode Kit)

[Nicolas George]

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Le nonidi 29 ventôse, an CCX, Nicolas George a écrit :
> http://savannah.gnu.org/projects/ocaml-tmk/

This project has a binding for the curses library, and uses the dynamic
loading. But a strange bug appears. With the following program:

open Curses

let main () =
  let w = initscr () in
  assert (cbreak ());
  assert (noecho ());
  assert (move 3 4);
  hline 0 42;
  ignore (getch ());
  assert (move 4 5);
  hline 0 42;
  ignore (getch ());
  endwin ()

let () = main ()

everything works good. But if the first line with getch becomes

  let () = ignore (getch ()) in

the second horizontal lines becomes a line of `q'. Further experiments
show that in some cases, the ncurses library is totally confused after
the first refresh. The problem does not appears when the binding is
statically linked (-custom, -use-runtime or ocamlopt) (but still
dynamically linked to ncurses). All this happens on Linux/i386. On
Solaris/sparc, anything segfaults at startup.

Does anyone here understand what is happening?

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Re: [Caml-list] Strange bug with dynamic loading (was: Text Mode Kit)

[Claudio Sacerdoti Coen]

> Further experiments
> show that in some cases, the ncurses library is totally confused after
> the first refresh. The problem does not appears when the binding is
> statically linked (-custom, -use-runtime or ocamlopt) (but still
> dynamically linked to ncurses).

 Just the same happened to me recently. The problem was just
 a wrong cast (from Value to some C type) and the effects where the same.
 If the problem is the same, just check your C code over and over again.

 					Regards,
					C.S.C.

-- 
----------------------------------------------------------------
Real name: Claudio Sacerdoti Coen
PhD Student in Computer Science at University of Bologna
E-mail: sacerdot@cs.unibo.it
http://caristudenti.cs.unibo.it/~sacerdot
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