/*
 * Copyright (c) 2013 Devscripts developers
 *
 * Permission to use, copy, modify, distribute, and sell this software and 
 * its documentation for any purpose is hereby granted without fee, provided
 * that (i) the above copyright notices and this permission notice appear in
 * ...
 * 3. Neither the name of the copyright holder nor the names of contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * ...
 * [The next bit comes from freeswitch/libs/apr/poll/unix/port.c:]
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * ...
 * [this from freeswitch/libs/apr-util/include/apr_md5.h]
 * The RSA copyright statement and Licence for that original material is
 * included below. This is followed by the Apache copyright statement and
 * ...
 * [from freeswitch/libs/libzrtp/include/zrtp_legal.h and .../libzrtp/third_party/bnlib/legal.h]
 * We want the copyright string accessable to the unix strings command in
 * We want the copyright string to be accessable to the unix strings command 
 * [and .../libs/libwebsockets/win32port/zlib/deflate.c]
     copyright string in the executable of your product.
 * [from .../libs/sofia-sip/libsofia-sip-ua/su/su_md5.c ]
 * 1993, no copyright is claimed. This code is in the public domain; do with
 * copyright in any changes I have made; this code remains in the
 * [from most of sqlite]
** The author disclaims copyright to this source code.  In place of
 */
# from freeswitch/libs/sofia-sip/libsofia-sip-ua/msg/msg_date.c
#define is_digit(c) ((c) >= '0' && (c) <= '9')