brainfuck man page on MirBSD

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BRAINFUCK(1)		     BSD Reference Manual		  BRAINFUCK(1)

NAME
     brainfuck - Brainfuck interpreter written in Perl

SYNOPSIS
     brainfuck [file ...]

DESCRIPTION
     The brainfuck utility interprets its standard input as a Brainfuck
     script. Processing will start after EOF. If you started brainfuck in-
     teractively, hit ^D (Ctrl-D) on a new line to start.

     If optional arguments (file ...) are passed, these are run as if con-
     catenated instead, and standard input processing starts immediately when
     utilised by the script.

THE LANGUAGE
     Brainfuck is a simple enough language to include the entire official
     language describtion in this manual page. The following table is from the
     original Brainfuck distribution by its inventor Urban Mueller
     <umueller@amiga.physik.unizh.ch>:

     The language Brainfuck knows the following commands:

	   Cmd	Effect					 Equivalent in C
	   ---	------					 ---------------
	   +	Increases element under pointer		 array[p]++;
	   -	Decrases element under pointer		 array[p]--;
	   >	Increases pointer			 p++;
	   <	Decreases pointer			 p--;
	   [	Starts loop, counter under pointer	 while(array[p]) {
	   ]	Indicates end of loop			 }
	   .	Outputs ASCII code under pointer	 putchar(array[p]);
	   ,	Reads char and stores ASCII under ptr	 array[p]=getchar();

     All other characters are ignored.

     The array elements and p are being initialized to zero at the beginning.
     Now while this seems to be a pretty useless language, it can be proven
     that it can compute every solvable mathematical problem (if we ignore the
     array size limit and the executable size limit).

     This implementation reads and writes to stdio in bytes. Its cells are of
     the size of a standard Perl integral type, signed and with wrap-around
     behaviour. It uses LF as end of line and NUL as end of input indicator.

SEE ALSO
     perl(1)

HISTORY
     brainfuck first appeared in MirOS #1.

AUTHORS
     Urban Mueller designed the language.

     Marko Nippula wrote this interpreter.

     The Chaos Computer Club Cologne gave some hints for the man page.

     Thorsten Glaser wrote this man page, put things together for MirOS, and
     later corrected the interpreter.

MirOS BSD #10-current		 July 1, 2010				     1
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