Hello Henk,
I think Gerhard is true, I have search where come from NIL or if there
was another definition for -1 value in AES.
I have found it as define to -1:
- in aes.h coming from Lattice C 5.60
- COMPUTE!'s Technical Reference Guide ATARI ST Volume 2 AES
- In documentation for PC GEM http://www.seasip.info/Gem/aestruct.html
- In documentation from Lonny Pursell for GFA :
http://gfa.atari-users.net/stg/gfabasic.htm
But I have found it in Compendium NIL is defined as 0 in objc_add(), but
this is wrong else it doesn't work.
So I think NIL should be -1, for 0L NULL should work and is defined for
all C compiler.