Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!husc6!ogccse!schaefer
From: schaefer@ogccse.ogc.edu (Barton E. Schaefer)
Newsgroups: comp.lang.c
Subject: Re: preprocessor question (non-ANSI)
Keywords: #define C ANSI
Message-ID: <5060@ogccse.ogc.edu>
Date: 10 Oct 89 16:52:02 GMT
References: <174@eliza.edvvie.at> <1679@ruuinf.cs.ruu.nl>
Reply-To: schaefer@ogccse.UUCP (Barton E. Schaefer)
Organization: Oregon Graduate Center, Beaverton, OR
Lines: 23

In article <1679@ruuinf.cs.ruu.nl> piet@cs.ruu.nl (Piet van Oostrum) writes:
} In article <174@eliza.edvvie.at>, johnny@edvvie (Johann Schweigl) writes:
}  `How can I replace a text token by itself, along with some additional text?
}  `EXEC SQL select * from emp;     __curline = 23; EXEC SQL select * from emp;
}  `before ^^^^^^^^^^^^^^^^^^^^     after ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
} If your preprocessor is non-ANSI, you might try:
} 
} 	#define EXEC __curline = __LINE__; EX/**/EC 

This doesn't quite work; cpp apparently re-evaluates the token as soon
as it has stripped the /**/, so it becomes recursive.  To completely
fool cpp, you must use the horrible

	#define EXEC __curline = __LINE__; EX//**/**/**//EC 

} Note that this is very unportable.

No kidding.
-- 
Bart Schaefer      "A Yellowbeard is never so dangerous as when he's dead."
                                              -- Graham Chapman, 1941-1989
CSNET / Internet                schaefer@cse.ogc.edu
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