Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!seismo!ut-sally!husc6!mit-eddie!ll-xn!ames!amdcad!amd!intelca!oliveb!pyramid!prls!philabs!micomvax!musocs!mcgill-vision!mouse
From: mouse@mcgill-vision.UUCP (der Mouse)
Newsgroups: comp.lang.c
Subject: Re: Style question re common C expression.
Message-ID: <829@mcgill-vision.UUCP>
Date: Fri, 26-Jun-87 22:50:09 EDT
Article-I.D.: mcgill-v.829
Posted: Fri Jun 26 22:50:09 1987
Date-Received: Sat, 4-Jul-87 23:07:53 EDT
References: <4934@utcsri.UUCP> <8164@utzoo.UUCP>
Organization: McGill University, Montreal
Lines: 23

In article <8164@utzoo.UUCP>, henry@utzoo.UUCP (Henry Spencer) writes:
>> ... like the standard "#define STREQ(s,t)(strcmp(s,t) == 0)"?

> [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)

Perversion?  You mean, as in

docommand(cmd)
register char *cmd;
{
 register char **cmdptr;

 cmdptr = commands;                              /* vvvvvvvvv */
 while ((cmdptr < commands+NCOMMANDS) && !STREQ(cmd,*cmdptr++)) ;
 (*cmdfxns[cmdptr-commands])(cmd); /* assumes extra entry for bad cmd */
}

					der Mouse

				(mouse@mcgill-vision.uucp)