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From: bazyar@ernie (Jawaid Bazyar)
Newsgroups: comp.sys.apple2
Subject: Re: Stacks, Basic, and Onerr
Message-ID: <1991Mar20.160105.14029@m.cs.uiuc.edu>
Date: 20 Mar 91 16:01:05 GMT
References: <9103191800.AA11676@apple.com> <9788@latcs1.oz.au>
Sender: news@m.cs.uiuc.edu (News Database (admin-Mike Schwager))
Reply-To: bazyar@cs.uiuc.edu (Jawaid Bazyar)
Organization: Mutation Testing Facility, University of Illinois
Lines: 19

>"Edward M. Moore" writes:
> I'm trying to design a program using gosubs.  One of the sections is
> where I have a file-handeling (loading a shape table) from disk.  I would
> like to use OnErr Goto in order to handle the error, but when that happens
> I loose my stack of gosubs.  How can this be prevented?

   I seem to recall there being a bug with Applesoft's error handling
routines that could cause it to forget the gosub stack in certain cases. A
few pokes correct the problem, but offhand I wouldn't know what they were
(it's been years since I hacked Applesoft).  A good place to find out would
be "What's Where in Your Apple II", the all-time Applesoft Hacker's Bible.
   I might have the proper code in my old Basic BBS program- I'll see if
I can find it (the program's a nasty mess though, so no guarantees).

--
Jawaid Bazyar               |"I'm sure K&R have never heard of Mike." 
Senior/Computer Engineering |
bazyar@cs.uiuc.edu          |"That's okay. I'm sure Mike's never heard of K&R".
   Apple II Forever!        |  (discussion about Orca/C)