The macros are fine as concept, i've used something similar before for reducing code size,e.g. defining hundreds of similar functions and stuff. What is incomprehensible and puts the entire thing into "Obfuscated C" territory is one-letter variables. You'll need to memorize all of them and can't reuse them in normal code. If at least the variables were self-descriptive i'd support such coding style, but it clearly need comments.