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From: guy@sun.uucp (Guy Harris)
Newsgroups: net.lang.c
Subject: Re: How about a predefined #FILE, #PATH and #FUNCTION for C?
Message-ID: <3198@sun.uucp>
Date: Tue, 28-Jan-86 02:41:58 EST
Article-I.D.: sun.3198
Posted: Tue Jan 28 02:41:58 1986
Date-Received: Thu, 30-Jan-86 01:13:41 EST
References: <312@yale.ARPA <887@h-sc1.UUCP>
Organization: Sun Microsystems, Inc.
Lines: 18

> I cannot claim to speak about other versions of unix, but in Berkeley
> 4.2 and 4.3, there are two macros automatically defined for you by the
> c preprocessor: __FILE__ and __LINE__. ...
>
> Could someone on a non-4.2/4.3 BSD machine tell us if this facility is
> part of other preprocessors as well?  Thanks.

This facility was added to the C preprocessor by John Reiser at Bell Labs;
it first appeared outside the Labs in V7.  It is, therefore, in V7 and all
post-V7 UNIX systems except those where the supplier decided to "improve" it
by supplying a C compiler which doesn't support it - let's hope there aren't
any such systems.  It's even documented in the System V "cpp" manual page,
along with the "defined()" operator.  I believe that both __FILE__ and
__LINE__, as well as "defined()", are in the ANSI C draft standard.
-- 
	Guy Harris
	{ihnp4, decvax, seismo, decwrl, ...}!sun!guy
	guy%gorodish@sun.arpa	(yes, really)