Path: utzoo!news-server.csri.toronto.edu!rutgers!cs.utexas.edu!sdd.hp.com!hp-pcd!hpcvra.cv.hp.com!billw
From: billw@hpcvra.cv.hp.com. (William C Wickes)
Newsgroups: comp.sys.handhelds
Subject: Re: New IFERR and libraries in general
Message-ID: <25590121@hpcvra.cv.hp.com.>
Date: 12 Mar 91 19:11:05 GMT
References: <1991Mar11.231226.15527@santra.uucp>
Organization: Hewlett-Packard Co., Corvallis, OR, USA
Lines: 36

>	a) Seems that using the new IFERR posted by Dr. Wickes
>	   last week screws up the indentation of RPL programs.
>	   Any way to correct this?

The program decompiler built into the 48 doesn't recognize the library IFERR,
which messes up the orderly indentation.  There's no fix for this.

>	b) Seems that DETACH does not complain when attempting to
>	   detach a library _not_ attached to the current directory.
>	   Now, is there a _simple_ way to find out into _which_
>	   directory a library is attached?

The information about which library is attached to a subdirectory is stored
in the directory, not the library.  Hence there is no simple way to
catalog library attachments.

>	   I know I could use LIBS to determine whether the library
>	   is _not_ attached to the current directory, but its
>	   not good enough.  I suppose LIBS used with a directory
>	   traversal routine could be used to locate the correct
>	   directory, but its a real drag. Plus I am not entirely
>	   sure about the uniqueness of the result.

This is the only way to do it; but note that a particular library can be
attached to any number of directories.

>	c) When I PURGE a detached library, the display jerks sideways
>	   about one half of the screen. Is this supposed to happen?

This is normal and harmless.  The library configuration table is stored
at a lower address than the display RAM, so when the table shrinks, the
display jerks while memory is being merged.  I actually "use" this effect
to give me confirmation that the purge has actually happened.

Bill Wickes
HP Corvallis