+ * -----------------
+ * 22-May-99 added environment substitutuion, enabled with -E switch.
+ * Andreas Arens <andras@cityweb.de>.
+ *
+ * 12-May-99 added a feature to read data to be sent from a file,
+ * if the send string starts with @. Idea from gpk <gpk@onramp.net>.
+ *
+ * added -T and -U option and \T and \U substitution to pass a phone
+ * number into chat script. Two are needed for some ISDN TA applications.
+ * Keith Dart <kdart@cisco.com>
+ *
+ *
+ * Added SAY keyword to send output to stderr.
+ * This allows to turn ECHO OFF and to output specific, user selected,
+ * text to give progress messages. This best works when stderr
+ * exists (i.e.: pppd in nodetach mode).
+ *
+ * Added HANGUP directives to allow for us to be called
+ * back. When HANGUP is set to NO, chat will not hangup at HUP signal.
+ * We rely on timeouts in that case.
+ *
+ * Added CLR_ABORT to clear previously set ABORT string. This has been
+ * dictated by the HANGUP above as "NO CARRIER" (for example) must be
+ * an ABORT condition until we know the other host is going to close
+ * the connection for call back. As soon as we have completed the
+ * first stage of the call back sequence, "NO CARRIER" is a valid, non
+ * fatal string. As soon as we got called back (probably get "CONNECT"),
+ * we should re-arm the ABORT "NO CARRIER". Hence the CLR_ABORT command.
+ * Note that CLR_ABORT packs the abort_strings[] array so that we do not
+ * have unused entries not being reclaimed.
+ *
+ * In the same vein as above, added CLR_REPORT keyword.
+ *
+ * Allow for comments. Line starting with '#' are comments and are
+ * ignored. If a '#' is to be expected as the first character, the
+ * expect string must be quoted.
+ *
+ *
+ * Francis Demierre <Francis@SwissMail.Com>
+ * Thu May 15 17:15:40 MET DST 1997
+ *
+ *
+ * Added -r "report file" switch & REPORT keyword.
+ * Robert Geer <bgeer@xmission.com>
+ *
+ * Added -s "use stderr" and -S "don't use syslog" switches.
+ * June 18, 1997
+ * Karl O. Pinc <kop@meme.com>
+ *
+ *
+ * Added -e "echo" switch & ECHO keyword
+ * Dick Streefland <dicks@tasking.nl>
+ *
+ *
+ * Considerable updates and modifications by
+ * Al Longyear <longyear@pobox.com>
+ * Paul Mackerras <paulus@cs.anu.edu.au>