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When I found the Portable Brainfuck Interpreter by Urban Mueller, who also created the language, it was on [Linus Akesson's]( webpage, totally crushed and minimized. I had just finished writing [my own BF interpreter](, which was long and very verbose, so I wanted to know how much slimmer this portable version of the interpreter really was.
So what I did here was:
* Expand the original to where it was more readable
* Annotate what was happening in plain language
* Refactor it to make it easier to follow, esp for a C rube like me
I learned a LOT about operator precedence (particular postfix and prefix notation), comma operators, file descriptors, and a few other things. Overall a fun knot to unravel.