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From: ari@eleazar.dartmouth.edu (Ari Halberstadt)
Newsgroups: comp.sys.mac.programmer
Subject: Question about TECopy with Heap scramble/purge [possible bug?]
Message-ID: <17072@dartvax.Dartmouth.EDU>
Date: 17 Nov 89 22:14:56 GMT
Article-I.D.: dartvax.17072
Sender: news@dartvax.Dartmouth.EDU
Reply-To: ari@eleazar.dartmouth.edu (Ari Halberstadt)
Organization: Dartmouth College, Hanover, NH
Lines: 21

In more of my adventures with text edit, I seem to have run into
a very odd bug, possibly in Apple's system software. Using TMON
on a mac II with 4 megs of RAM, I turned heap check/scramble/purge
on. My code seems to run perfectly, but when I call TECopy,
random garbage is copied to the desk scrap. I'm using it on
the new styled text edit on system 6.02, with THINK C 4.0.
Using the debugger, I set a breakpoint just before TECopy, and then executed
my program without scrambling the heap. When the program stopped,
I turned the scrambling on, stepped over TECopy, and turned
scrambling off. Thus, only during the call to TECopy was scrambling/purging
turned on. Still, the bug persisted. I even tried locking the TEHandle
before calling TECopy, but this also didn't fix the problem. The bug
also exists when I build an application, thus eliminating the THINK C
debugger from the possible corrupters of memory. So, if anyone has
any ideas, I would truly appreciate hearing them. If a sollution is
found, and it wasn't posted to the net, then I'll summarize and post it.

--

Ari Halberstadt '91, "Long live succinct signatures"
ari@eleazar.dartmouth.edu	Disclaimer: "Live Free or Die"