🚀 go-pugleaf

[  SLIM is the big brother of TERSE, the 4K editor, announced
recently.  Both are available for anonymous ftp download from
cs.ubc.ca:/pub/pikcup/trs140f.zip and cs.ubc.ca:/pub/pickup/update.zip
(for some minor config updates, and more error messages related to the
<Alt-f> command)  ]

One of SLIM users reported a problem with the filter command.
I haven't been able to reproduce the problem, and I haven't heard any
other similar complaints. I wonder if any one out there had experienced
similar difficulties, and if any hints could be provided to help me hunt
down this bug.

The filter command runs an external filter (UNIX like program which reads
its stdin, process it, and produces stdout), feeding input to it from
the editor buffers, and caputering its output to another editor buffer.
The net effect is that the currently marked block is replaced with the
output of the filter when applied to that block. This magic is implemented
by simply trapping the READ and WRITE calls to DOS.

The main symptom is that the input is not fed into the filter. Instead,
it appears that the filter, at least sometimes, (LIST /s is an example)
is expecting input from the keyboard. At other occassions, output is not
produced at all. The bug is not completely determinstic, but a completely
flawless execution was never observed by this user.

Simple instructions to try this are: invoke slim on a file, mark 2-3
lines, press [Alt-F], type wc, hit [Enter], and watch for the content
of the marked block replaced with the the line, word and chars counts
of the marked block.  [Hitting Keypad-*] should undo this operation.
[Keypad-*] again will redo it.  You may try other filters as well "LIST
/s", "DIR", etc.

The only non-standard thing in this user system is Novell netware.

    1. Could it be that Novell is untrapping DOS calls? 

    2. How does it do it?

    3. How can one disable this ``feature''?

Any help would be greatly appreciated.

Yossi
--
Joseph (Yossi) Gil                 {alberta,uw-beaver,uunet}!ubc-cs!yogi
Dept. of Computer Science          yogi@cs.ubc.ca (cs.ubc.ca=137.82.8.5)
6356 Agricultural Road., Univ. of B.C.,             Tel: +1-604-822-8175
Vancouver, British Columbia, V6T 1Z2, Canada.       Fax: +1-604-822-5485