* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) University of Cambridge 1995 - 2009 */
+/* Copyright (c) University of Cambridge 1995 - 2015 */
/* See the file NOTICE for conditions of use and distribution. */
transport_instance *
check_file_format(int cfd, transport_instance *tblock, address_item *addr)
{
-uschar *format =
+const uschar *format =
((appendfile_transport_options_block *)(tblock->options_block))->file_format;
uschar data[256];
int len = read(cfd, data, sizeof(data));