Compiles Brainfuck to C || Warning: This not the best code I have written.

bf2c.py

#!/usr/bin/env python2
import sys

def multstr(n,st):
	o = ""
	for i in range(0,n):
		o += st
	return o

def unpack_opts(s, t):
	s = s.split(" ")
	o = {}
	for opt in s:
		if opt[0] != "-":
			raise Exception("Option does not start with a -")
		if opt[1:] in t:
			o[t[opt[1:]]] = True
	return o

def sopen(p, m='r'):
	return [open(p, m), 0]

def sread(f, n, unsafe=False):
	b = f[0].read(n)
	if len(b) < n and not unsafe:
		b += " " * (n - len(b))
		f[1] += (n - len(b))
	return b

def sseek(f, n):
	if f[1] > 0:
		n -= f[1]
		f[1] = 0
	f[0].seek(n, 1)

def sclose(f):
	f[0].close()

options = {
	'O': 'optimize',
}

default_opts = {
	'optimize': False,
}

tabchar = "\t"
tapesize = 16384

if len(sys.argv) <= 2:
	print("Usage: %s <input> <output> [options]" % sys.argv[0])
	print("Valid options:")
	print("\t-O\t\tEnable optimization")
else:
	if len(sys.argv) > 3:
		opts = unpack_opts(sys.argv[3], options)
	else:
		opts = default_opts
	fi = sopen(sys.argv[1])
	fi2 = open(sys.argv[2], 'w')
	fi2.write('#include <stdio.h>\n#include <stdlib.h>\n#include <inttypes.h>\n\nuint8_t* ptr;\n\n')
	fi2.write('int main(void)\n{\n%sptr = malloc(%d * sizeof(uint8_t));\n%sif(!ptr)\n%s%sabort();\n' % (tabchar, tapesize, tabchar, tabchar, tabchar))
	s = " "
	ind = 1
	while s != "":
		s = sread(fi, 1, True)
		if s == "+":
			if opts['optimize'] and sread(fi, 1) == "+": # apply optimisation if possible
				n = 1 # actually 2, will be incremented in while loop
				b = '+'
				while b == "+":
					n += 1
					b = sread(fi, 1)
				sseek(fi, -1) # undo last read
				fi2.write(multstr(ind, tabchar) + "*ptr += " + str(n) + ";\n")
				continue
			else:
				if opts['optimize']: sseek(fi, -1) # undo read
			fi2.write(multstr(ind, tabchar) + "++*ptr;\n")
		elif s == "-":
			if opts['optimize'] and sread(fi, 1) == "-": # apply optimisation if possible
				n = 1 # actually 2, will be incremented in while loop
				b = '-'
				while b == "-":
					n += 1
					b = sread(fi, 1)
				sseek(fi, -1) # undo last read
				fi2.write(multstr(ind, tabchar) + "*ptr -= " + str(n) + ";\n")
				continue
			else:
				if opts['optimize']: sseek(fi, -1) # undo read
			fi2.write(multstr(ind, tabchar) + "--*ptr;\n")
		elif s == ">":
			if opts['optimize'] and sread(fi, 1) == ">": # apply optimisation if possible
				n = 1 # actually 2, will be incremented in while loop
				b = '>'
				while b == ">":
					n += 1
					b = sread(fi, 1)
				sseek(fi, -1) # undo last read
				fi2.write(multstr(ind, tabchar) + "ptr += " + str(n) + ";\n")
				continue
			else:
				if opts['optimize']: sseek(fi, -1) # undo read
			fi2.write(multstr(ind, tabchar) + "++ptr;\n")
		elif s == "<":
			if opts['optimize'] and sread(fi, 1) == "<": # apply optimisation if possible
				n = 1 # actually 2, will be incremented in while loop
				b = '<'
				while b == "<":
					n += 1
					b = sread(fi, 1)
				sseek(fi, -1) # undo last read
				fi2.write(multstr(ind, tabchar) + "ptr -= " + str(n) + ";\n")
				continue
			else:
				if opts['optimize']: sseek(fi, -1) # undo read
			fi2.write(multstr(ind, tabchar) + "--ptr;\n")
		elif s == ".":
			fi2.write(multstr(ind, tabchar) + "putchar(*ptr);\n")
		elif s == ",":
			fi2.write(multstr(ind, tabchar) + "*ptr = getchar();\n")
		elif s == "[":
			if opts['optimize'] and sread(fi, 1) == "-": # apply optimisation if possible
				if sread(fi, 1) == "]":
					fi2.write(multstr(ind, tabchar) + "*ptr = 0;\n")
					continue
				else:
					sseek(fi, -2) # undo reads
			else:
				if opts['optimize']: sseek(fi, -1) # undo read
			fi2.write(multstr(ind, tabchar) + "while(*ptr) {\n")
			ind += 1
		elif s == "]":
			ind -= 1
			fi2.write(multstr(ind, tabchar) + "}\n")
	sclose(fi)
	fi2.write('\n%sreturn 0;\n}\n' % tabchar)
	fi2.close()