Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!apple!austing
From: austing@Apple.COM (Glenn L. Austin)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Can LSC call a Pascal function pointer?
Keywords: LSC,Pascal functions
Message-ID: <30290@apple.Apple.COM>
Date: 8 May 89 16:32:46 GMT
References: <1491@internal.Apple.COM>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 29

In article <1491@internal.Apple.COM> rpd@Apple.COM (Rick Daley) writes:
>OK, everyone knows that you can create a function that follows Pascal
>calling conventions by using the "pascal" keyword.  But, what if you
>want to declare a pointer to one of these functions and then call it?
>I'm using LSC 3.0 and I can't figure out how to do it.  I even resorted
>to looking through the manual.
>
>In MPW, I can do this:
>
>typedef pascal long (*routinePtr)(OSErr err, ushort ignoreThis);
>
>But in LSC, I can't get the compiler to accept either the "pascal" keyword
>or a parameter list in the typedef.  The only solution I know of is to
>call the routine via inline assembler.  What's a poor programmer to do?

What I do is write a front-end caller for LSC which uses a "generic" procedure
definitions for the pascal function pointer, then set the pointer to the value
passed into my call, then make the call.  I haven't had to resort to assembly
to do any of this, it is simply C code (although I admit it is rather ugly).


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| Glenn L. Austin             | The nice thing about standards is that      | 
| Apple Computer, Inc.        | there are so many of them to choose from.   | 
| Internet: austing@apple.com |       -Andrew S. Tanenbaum                  |
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| All opinions stated above are mine -- who else would want them?           |
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