Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!rutgers!uwvax!umn-d-ub!cs.umn.edu!nis!quest!digibd!merlyn
From: merlyn@digibd (Brian Westley (Merlyn LeRoy))
Newsgroups: comp.sys.mac.programmer
Subject: Think C non-tail patching (& PACK3)
Message-ID: <1990Feb8.150728.9760@digibd>
Date: 8 Feb 90 15:07:28 GMT
Organization: DigiBoard Incorporated, St. Louis Park, MN
Lines: 26

How do I clean up the stack & jmp to a patched routine, instead
of tail-patching it, in Think C 4.0?  Something like..

<init main>
{
jmpto = NGetTrapAddress(trapnum, ToolTrap);
NSetTrapAddress(trapnum, myroutine, ToolTrap);
}
....
myroutine(arg1, arg2)
{
	<stuff>
	CallPascal(arg1, arg2, jmpto);		/* A nasty tail patch */
}

The CallPascal() call should be replaced by asm {} stuff that cleans up
the stack and does a jmp to "jmpto".  However, I haven't been able to
figure it out and I'm tired of crashing my machine.  Someone must have
invented this wheel already.

On a related note, how do I patch PACK3, which has different arguments
depending on how it's called?  Similar to the above problem.

Thanks for any help.  May as well post it, it's of general interest.
-----
Merlyn LeRoy