Experimental Physics and
Industrial Control System

Andrew Johnson <[email protected]> · Tue, 18 Oct 2011 10:30:03 -0500

Hi Michael,

On 2011-10-18 Michael Davidsaver wrote:
> I've stumbled onto an interesting behavior of aSub.  I want to write a
> function which takes a CHAR array as input (a long string).  Sometimes
> the string can legitimately be empty (length 0).  What I find is that
> when the the input should go from non-empty to empty it does not, and
> instead keeps the previous value.

The number of elements of a long string (char array) must always include the 
terminating nil character, thus an empty string must have an element count of 
one, not zero.  If you don't include the terminator in your element count your 
string might get old garbage appended to it.

- Andrew
-- 
Optimization is the process of taking something that works and
replacing it with something that almost works, but costs less.
-- Roger Needham

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System