branfuck

This is an implementation of brainfuck in rc(1). The details of the implementation are in the source code, it is thoroughly commented.

Artistic considerations

• rc cannot take input other than via the commandline and environment.
• As of such, the input program is expected to be provided in the $input variable, as an array with each element containing an instruction.
• A script, convert.awk, is provided to convert valid brainfuck programs into an rc statement that sets up the environment as branfuck expects. It recieves a program from standard input.
• As rc is unable to produce output nor take input, it is unable to implement the instructions .,.
• As of such, it is best to think of branfuck as an implementation of P'', as it only implements +-<>[].
• The builtins used are shift, ~, and eval. No external binaries are used, other than echo, which outputs the contents of the tape if the flag -d is given.
• If you want to avoid the use of echo within the body of the program, you can simply evalute the program using . ./branfuck.rc, and then output the contents of the variable $tape yourself.

Demonstrations