Path: utzoo!attcan!uunet!snorkelwacker!tut.cis.ohio-state.edu!zaphod.mps.ohio-state.edu!usc!apple!keith
From: keith@Apple.COM (Keith Rollin)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Breaking out of a series of routines
Message-ID: <42856@apple.Apple.COM>
Date: 11 Jul 90 13:24:26 GMT
References: <25526@cs.yale.edu>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 20

In article <25526@cs.yale.edu> tarr-michael@CS.Yale.EDU (michael tarr) writes:
>
>On an error condition I wish to immediately stop processing a large file
>and break out of about 10 routines that have been calling each other and
>return to my main event loop. Is there any way to do this without
>passing and error flag to each of the calling routines?

As Blayne noted, if you are programming in C, you can use
setjmp/longjmp. If you are using MacApp, then you can use the UFailure
routines, CatchFailures and Success. Both of these mechanisms are
subsets of the extensive Signals unit in DTS Sample Code #12. Those
routines can be used from both C and Pascal, and full source code is
provided.

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"Argue for your Apple, and sure enough, it's yours" - Keith Rollin, Contusions