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From: ron@brl-tgr.ARPA (Ron Natalie <ron>)
Newsgroups: net.lang.c
Subject: Re: String copy idiom.
Message-ID: <9421@brl-tgr.ARPA>
Date: Thu, 21-Mar-85 17:45:54 EST
Article-I.D.: brl-tgr.9421
Posted: Thu Mar 21 17:45:54 1985
Date-Received: Sat, 23-Mar-85 01:18:42 EST
References: <7042@watdaisy.UUCP> <7044@watdaisy.UUCP> <7047@watdaisy.UUCP> <366@ccice6.UUCP>
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Organization: Ballistic Research Lab
Lines: 18


> Beware of saying things like "the fastest possible".
> I found a better way for for any string longer than two characters.
> The following is from 4.2BSD on a VAX.
> 
> main()
> {
> 	register char *s, *d;
> 	while( *d++ = *s++ );			/* ok */
> 	if (*d) do {} while ( *d++ = *s++ );	/* <-- FAST -- */
> }
> 
Beware of posting solutions that don't work.  If *d == 0 you don't
copy anything at all.  I'm not quite sure why you put the test in,
all it does is make the loop dependent on whats in the destination
string before you copy into it.

-Ron