Re: Pointer vs. BIF performance

Hello Barbara,
I've always wonder what kind of problem I might encounter if I assign a
pointer variable with an address that is beyond the end of a variable. I've
always assume that it is ok as long as the program does not attempt to
access the point to address. I guess that is a wrong assumption.




"Barbara Morris" <bmorris@xxxxxxxxxx> wrote in message
news:mailman.22744.1250111088.23468.rpg400-l@xxxxxxxxxxxxxxx

bvining wrote:

... I would have used the pointer approach (for what that's worth) with a
slight change:

charPtr = %addr(SRCDATA);
for p = 0 to %len(%trimr(SRCDATA));
if char < x'40';
char = *blank;
endif;
charPtr += 1;
endfor;

Bruce, there's a slight risk of a pointer-offset error with that approach.
The final increment of the pointer positions it beyond the end of the
variable. If the SRCDATA variable happens to lie at the end of a
physical storage segment, you'd get MCH0601 on the last loop iteration.