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From: mcdonald@aries.scs.uiuc.edu (Doug McDonald)
Newsgroups: comp.lang.c
Subject: Re: Do you trust the "indent" program?
Message-ID: <1991Jan1.151157.19442@ux1.cso.uiuc.edu>
Date: 1 Jan 91 15:11:57 GMT
References: <12184@sybase.sybase.com> <5970@stpstn.UUCP>
Sender: news@ux1.cso.uiuc.edu (News)
Organization: School of Chemical Sciences, Univ. of Illinois at Urbana-Champaign
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I would have used e-mail, but I know that it is hopeless: the poster of
the following gave no "real" address, only the bogus one "lerman@stpstn.UUCP"
He should edit his sendmail program to use a real address, either UUCP-
style complete with !'s or internet style a@b.c.d.e. Or put
his real address in a signature line.
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In article <5970@stpstn.UUCP> lerman@stpstn.UUCP (Ken Lerman) writes:
>
>NO, I would not trust indent.  
Then you are deluded. Indent is probably more trustworthy than your
C compiler.
>
>Alternative 1:
>You could write a program (call it undent) which replaces each
>contiguous string of white space with a single blank character.  You
>could run it on my code before and after running indent and diff the
>results.  If they are the same, you are probably OK.
This is a sufficient but not necessary condition. Indent will not
in general pass this test.

>
>The one area of concern I'd have left is what is done with comments.
>In particular, some CPPs treat the zero length comment /**/ as a
>concatenation operator.

Not if they are compiling the C language they don't. The string
/**/ MUST be replaced by a single white space. Period. All pertinent
references (K&R first edition, K&R second edition, and the actual
ANSI standard) all agree 100% on this. If you so-called C compiler
does something else, it is terminally broken.

>Make sure that the undent program does NOT
>treat this as white space. 

It MUST treat it as white space!!! Because that is what it is.

Doug McDonald (mcdonald@aries.scs.uiuc.edu)