def dbg(format, *args):
    if options.debug:
        fr = sys._getframe(1)
        filename = os.path.basename(fr.f_code.co_filename)
        func = fr.f_code.co_name
        lineno = fr.f_lineno
        sys.stderr.write(('%s:%s():%d: ' + format + '\n')
                         % ((filename, func, lineno) + args))

def info(format, *args):
    if not options.quiet:
        print format % args

def warn(format, *args):
    sys.stderr.write(('Warning: ' + format + '\n') % args)

def err(format, *args):
    sys.stderr.write(('Error: ' + format + '\n') % args)
    sys.exit(1)