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From: rjchen@phoenix.UUCP
Newsgroups: comp.lang.c
Subject: Re: Unstylish #defines ??
Message-ID: <763@phoenix.PRINCETON.EDU>
Date: Thu, 24-Sep-87 16:03:47 EDT
Article-I.D.: phoenix.763
Posted: Thu Sep 24 16:03:47 1987
Date-Received: Sat, 26-Sep-87 13:26:10 EDT
References: <325@petro.UUCP>
Reply-To: rjchen@phoenix.UUCP (Raymond Juimong Chen)
Distribution: na
Organization: Princeton Univ. Computing and Information Technology
Lines: 28
Keywords: quotes, files
Summary: ANSI has a better way

In article <325@petro.UUCP> jrb@petro.UUCP (Jon Boede) writes:
>I've been toying with ways to make the `HOME' directory for a pile of software
>a little more portable and the following sure beats the method where you
>effectively get -> sprintf(buf,"%s/afile","/usr/me"); fopen(buf,"r"); <- but
>it sure does LOOK wierd!
>
>#define FOO "/usr/me
>stream = fopen(FOO/afile","r");

The official ANSI C way of doing it is as follows:

#define FOO "/usr/me"
stream = fopen(FOO "/afile", "r");

This expands to
stream = fopen("/usr/me" "/afile", "r");

which the preprocessor mushes together to make
stream = fopen("usr/me/afile", "r")

Of course, you need an ANSI-draft-conforming preprocessor first.


-- 
Raymond Chen, BITNET: (preferably) 6101695@pucc, rjchen@pucc
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