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From: rcw@qetzal.UUCP (sysop)
Newsgroups: comp.lang.c
Subject: Re: goto's in C: an opinion...
Message-ID: <184@qetzal.UUCP>
Date: Sun, 2-Aug-87 02:14:57 EDT
Article-I.D.: qetzal.184
Posted: Sun Aug  2 02:14:57 1987
Date-Received: Tue, 4-Aug-87 06:27:30 EDT
References: <3289@bigburd.PRC.Unisys.COM> <7571@beta.UUCP> <6603@think.UUCP> <1125@nu3b2.UUCP>
Organization: Graphics Information, Inc., Denver, CO.
Lines: 44
Keywords: C, goto, style
Summary: basis for error system

In article <1125@nu3b2.UUCP>, rwhite@nu3b2.UUCP (Robert C. White Jr.) writes:
[The Robert C. White, Jr. quoted is not me. I am the other one]
> 
> In all your goto stuff I find that what you really want is the
> setjump() longjump() construct which has been in all [both might
> be a better word, its been marginally over three] the compilers 
> I have had to work with.  It would seem to address all your examples
> of necessary goto(s).
> 

I agree! We have used setjump() and longjump() to develop an 
error system for software development in-house. This allows us

	1. To set an error control point.
	2. To Remove an error control point.
	3. Return to previous error control point.
	4. Handle cleanup.
	5. Eliminate a lot of code like:

	   if (status == BARF) barfflag++;

	This sort of code usually constitutes > 1/3 the
        project.

	6. Allow error logging in a journal.

We have created quite a few utility routines which eliminate the
need for the programmer to constantly check status. For example,
we have a routine U_open, which is an interface to open().

	fd = U_open("Foo",O_RDWR,0666);

The U_open routine issues the appropriate message to the user's 
terminal if there is a problem. You don't have to check errno or fd
yourself, just open it and away you go. 

Unfortunately, our code is proprietary, but I can hitch you up with 
an excellent consultant who can provide an excellent error system for 
you. 
-- 
Robert C. White, Jr. Graphics Information, Inc.   ****************
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