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From: oster@dewey.soe.berkeley.edu (David Phillip Oster)
Newsgroups: comp.sys.mac
Subject: BUG in LightSpeed C version 2.11
Message-ID: <20031@ucbvax.BERKELEY.EDU>
Date: Sun, 9-Aug-87 03:52:17 EDT
Article-I.D.: ucbvax.20031
Posted: Sun Aug  9 03:52:17 1987
Date-Received: Sun, 9-Aug-87 13:41:52 EDT
Sender: usenet@ucbvax.BERKELEY.EDU
Reply-To: oster@dewey.soe.berkeley.edu.UUCP (David Phillip Oster)
Distribution: world
Organization: School of Education, UC-Berkeley
Lines: 31


In THINK's haste to be compatible with the possibilities of the
future, they've made LightSpeed C incompatible with the actualities of
the past.

There have been complaints, here on the net, that the start-up code
executed by LightSpeed C before it calls your main() procedure looks
at the high bits of a handle, and that while that works for
all existing Macintoshes, if Apple were to change the format of
handles, it would stop working.  Well, THINK changed LightSpeed
C's start-up code, and in the process broke LightSpeed C for old
Macintoshes.

The new start-up code does an HGetState() to find out if a handle is
locked or not.  It does this _without_ doing the check that the system
call HGetState() is in fact defined.  So, run a program compiled in
LightSpeed C version 2.11 under System file version 2.0, and Boom! You
get the bomb alert with a DS code of 12 = "Unimplemented Core Routine".

THINK, we need a new version fast. Your customers have products to
ship, and those products will crash right now if their customers are still
using the old System file.

You can get the crash on a MacPlus with system file version 2.0,
Finder 4.1. I've tested and traced this one.  You can probably also
get the crash on a 512k unenhanced Mac, a 128k Mac or a MacXL, but I
don't have those handy to test on.

--- David Phillip Oster            --My Good News: "I'm a perfectionist."
Arpa: oster@dewey.soe.berkeley.edu --My Bad News: "I don't charge by the hour."
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