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From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: comp.lang.c
Subject: Re: Style question re common C expression.
Message-ID: <8164@utzoo.UUCP>
Date: Thu, 18-Jun-87 12:32:17 EDT
Article-I.D.: utzoo.8164
Posted: Thu Jun 18 12:32:17 1987
Date-Received: Thu, 18-Jun-87 12:32:17 EDT
References: <4934@utcsri.UUCP>
Organization: U of Toronto Zoology
Keywords: STREQ
Lines: 17

> ... like the standard "#define STREQ(s,t)(strcmp(s,t) == 0)"?

This is slightly off the topic, but note two things:

First, that should be "(strcmp((s),(t)) == 0)" for safety's sake, although
in this case trouble is unlikely.

Second, if you don't indulge in the perversion of routinely using side
effects within expressions, then a still better form is:

#define	STREQ(a, b)	(*(a) == *(b) && strcmp((a), (b)) == 0)

This makes a considerable speed difference in programs that use strings
a lot, since string comparisons usually fail on the very first character.
-- 
"There is only one spacefaring        Henry Spencer @ U of Toronto Zoology
nation on Earth today, comrade."   {allegra,ihnp4,decvax,pyramid}!utzoo!henry