From: Jeff King <peff@peff.net>
Date: Thu, 02 Nov 2006 06:51:27 GMT
Subject: Re: weird strncmp usage?
Message-ID: <20061102065127.GA23105@coredump.intra.peff.net>
In-Reply-To: <45494D84.2060402@shadowen.org>

On Thu, Nov 02, 2006 at 01:44:36AM +0000, Andy Whitcroft wrote:

> That said if you know its constant you can also use sizeof("foo") and
> that is done at compile time.  Something like:
> 
> #define strxcmp(x, y)	strncmp((x), (y), sizeof((y))

You would, of course, need to use sizeof(y)-1 to avoid comparing the NUL
termination. :)

This is a slightly dangerous macro, because it _only_ works for string
literals, but not pointers (which is fine in this case, but its
limitations need to be documented).