#! /bin/sh -e

# $Id$
# $URL$

# Copyright (C) 2006, 2007 Tilburg University
#
# This file is part of uvt-sum.  uvt-sum is free software; you can redistribute
# it and/or modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the License,
# or (at your option) any later version.  You should have received a copy of
# the GNU General Public License along with this file (see COPYING).

read -r sum origfile

case $# in
	0)
		file="$(mktemp)"
		trap 'rm -f "$file"' 0
		cat >"$file"
		echo "$sum  $file" | md5sum -c
		exec <"$file"
		exec cat
	;;
	1)
		file="$1"
		trap 'rm -f "$file,$$"' 0
		cat >"$file,$$"
		echo "$sum  $file,$$" | md5sum -c
		mv "$file,$$" "$file"
	;;
	*)
		echo "Too many arguments, usage: $0 [filename]" >&2
		exit 2
esac