Path: utzoo!attcan!utgpu!news-server.csri.toronto.edu!mailrus!wuarchive!zaphod.mps.ohio-state.edu!mips!bridge2!jarthur!mti!adrian
From: adrian@mti.mti.com (Adrian McCarthy)
Newsgroups: comp.lang.c
Subject: Re: Preprocessor macro to quote its argument
Summary: Egg on my face
Message-ID: <1114@mti.mti.com>
Date: 19 Aug 90 19:39:46 GMT
References: <1112@mti.mti.com>
Reply-To: adrian@mti.UUCP (Adrian McCarthy)
Organization: Micro Technology, Anaheim, CA
Lines: 19

In article <1112@mti.mti.com> adrian@mti.UUCP I wrote:
>Ever needed a preprocessor macro that could quote its argument?  [...]
>	#define Q	"
>	#define Q1(x)	Q x "

It has been pointed out by several kind folks that this is *not*
ANSI-compliant.  ANSI preprocessors do the tokenization of the input for
the rest of the compiler (thus ``preprocessor'' is arguably a misnomer),
so the #define lines would generate errors since the unpaired double-quote
is an incomplete token.

For ANSI preprocessors, use:
	#define Q1(x)	#x
For pre-ANSI preprocessors, the original solution *may* work.  Reportedly,
	#define Q1(x)	" x "
may even work with many pre-ANSI preprocessors, though not VAX C.

OK, so I was wrong,
Aid.  (adrian@gonzo.mti.com)