reading and skipping from port

Hi All,,

I am trying to write a simple program that do the following.

it increments a 3-bit binary number after a delay. It looks like following.

do{

if (bin_num++ > 0x7) bin_num=0;
deley();

}while(1)

Now what i want to do is that , read Port 1, and if any bit is Zero (for example if P1^3 is zero) then leave skip the number 3 in incrementing bin_num. So the bin_num will count as 0, 1, 2, 4, ..

Any quick idea how to best do this ??

Any help would be great.

Thankzz && Bye
-Rocknmoon