I am a little confused about the difference between ceilinged and floored
divide/modulus: which handles negative divisors returning negative of absolute
remainders and which returns reverse-order positive remainders. I am looking
for the latter in a cc65 
C program. If I'm not making myself clear, let's say I'm dividing -2 by 3. I
want the remainder to 1, not -2. How do I do that? C seems to by default give
-2 as the remainder. I also want a vocabulary check as mentioned. 

BTW, this is for compression software.

--- SoupGate-Win32 v1.05