another.bf

+++[>+++++<-]>[>+>+++>+>++>+++++>++<[++<]>---]>->-.[>++>+<<--]>--.--.+.>>>++.<<
.<------.+.+++++.>>-.<++++.<--.>>>.<<---.<.-->-.>+.[+++++.---<]>>[.--->]<<.<+.+
+.++>+++[.<][.]<++.

bf2c.py

import sys

fname = sys.argv[1]

f = open(fname)
source = f.read()
f.close()

header = """
#include<stdio.h>

int main(int argc, char**argv){
  char array[30000];
  char *ptr=array;

"""

footer = """
  return 0;
}
"""
mapping = {
  '>':  "++ptr;",
  '<':  "--ptr;",
  '+':  "++*ptr;",
  '-':  "--*ptr;",
  '.':  "putchar(*ptr);",
  ',':  "*ptr=getchar();",
  '[':  "while (*ptr) {",
  ']':  "}",
}

outname = fname[:-2]+'c'

f = open(outname, 'w')
f.write(header)

for c in source:
  o = mapping.get(c, '');
  f.write(o +'\n')

f.write(footer)
f.close()

helloworld.bf

+++++++++[>+++++++>++++++++++>+++>+<<<<-]>++.>+.+++++++..+++.>++.<<+++++++++++++++.>.+++.------.--------.>+.>.

Makefile

helloworld: bf2c.o helloworld.o
        gcc -o helloworld bf2c.o helloworld.o

bf2c.o: bf2c.c
        gcc -c bf2c.c

helloworld.o: helloworld.c
        gcc -c helloworld.c

helloworld.c: helloworld.bf bf2c.py
        python bf2c.py helloworld.bf

another: bf2c.o another.o
        gcc -o another bf2c.o another.o

bf2c.o: bf2c.c
        gcc -c bf2c.c

another.o: another.c
        gcc -c another.c

another.c: another.bf bf2c.py
        python bf2c.py another.bf

bf2c.cは中身空・・・。（いらなかった）

http://en.wikipedia.org/wiki/Brainfuck