Re: Re: Can `cpp' strip off comments in C source code?

[Robert Kiesling <kiesling at earthlink dot net>]

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> On 12/24/07, PRC <panruochen@gmail.com> wrote:
> > Things are a little complicated. I've googled a sed script on:
> > http://sed.sourceforge.net/grabbag/scripts/remccoms2.sh.txt
> >
> > But the script can't handle this testcase:
> >    printf("/*  Haha \n"); /* Haha */
> >        printf("//  Haha \n"); // Haha
> >
> > I think a simple regular expression filter is not enough. A lexical parsing is required to ensure the results come out right in all cases.
> > A prefessional utility is more suitable than a script written by me since I am not an expert in ANSI C standard.
> >
> > >AWK itself can do it, as can sed.
> >
> >
> 
> 
> Here's an AWK solution for you:
> 
> http://newsgroups.derkeiler.com/Archive/Comp/comp.lang.awk/2006-03/msg00200.html
> 
> See if it suits your needs.  For something like this, I think awk
> might be more capable than sed... not sure, though.

Perl does this very well.  I'm certain awk and sed can also accomplish
the task, though I haven't looked up your reference, and I don't have the
manuals in front of me.

perl -e 'undef $/; $i = <>; $i =~ s|/*.*?\*/||gsm; $i =~ s|//.*?\n||gsm; print $i;' <infile

(To answer the OP's question, btw, cpp does not have an option to remove comments without 
preprocessing the input, IIRC.)

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