deobfuscate.sh

#!/bin/bash

#
# IOCCC entry deobfuscator
# Copyright (c) 2013 Maxthon Chan <xcvista@me.com>
#
# This tool tries to deobfuscate code of C programming language using tools from
# LLVM project, namely clang and clang-format.
#

if [ "$1" == "--help" -o "$1" == "-h" -o "$1" == "" ]; then
	echo IOCCC Entry Deobfuscator, Version 1.0
	echo
	echo USAGE: `basename $0` "<file-names>" ...
	echo
	echo Copyright "(c)" 2013 Maxthon T. Chan "<xcvista@me.com>"
	echo You are free to use, copy, modify and distribute this code.
	exit 1
fi

if [ ! -x "`which clang`" -o ! -x "`which clang-format`" ]; then
	echo This tool depend on LLVM tools clang and clang-format.
	exit 1
fi

while [ "$1" != "" ]; do
	SOURCE="$1"
	EXT="${SOURCE##*.}"
	NAME="${SOURCE%.*}"

	# Preserve the headers
	HEADER="$NAME-preserve.h"
	cat "$SOURCE" | grep \\#include > "$HEADER"

	# Remove the include directives
	DEHEAD="$NAME-nohead.$EXT"
	cat "$SOURCE" | sed /\\#include/d > "$DEHEAD"

	# Preprocess the file
	PREPROCESS="$NAME-preprocessed.$EXT"
	clang -E "$DEHEAD" -o - | sed /\\#/d > "$PREPROCESS"

	# Reformat the file
	REFORMAT="$NAME-reformatted.$EXT"
	clang-format "$PREPROCESS" > "$REFORMAT"

	# Rebuild the file
	RESULT="$NAME-deobfuscated.$EXT"
	cat "$HEADER" > "$RESULT"
	cat "$REFORMAT" >> "$RESULT"

	# Clean up
	rm "$HEADER" "$DEHEAD" "$PREPROCESS" "$REFORMAT"

	# Next
	shift
done