Checking if a string is null

[Frits van Bommel]

Derek Parnell wrote:
> On Wed, 25 Jul 2007 14:29:47 +0100, Regan Heath wrote:
> 
>> Aside: If the location and length are identical you can short-circuit 
>> the compare, returning true and ignoring the content, this could save a 
>> bit of time on comparisons of large arrays.
> 
> I don't think this is such a good idea. How does one address the array of
> four bytes at RAM location 4?

I'm pretty sure the only way to obtain such an array would be to have 
already invoked Undefined Behavior (assuming 4 is an invalid memory 
location on the platform the program's running on) and as such it 
doesn't really matter whether or not two array references to it compare 
equal or not...