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+#ifndef HEADER_CURL_ARPA_TELNET_H
+#define HEADER_CURL_ARPA_TELNET_H
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ * SPDX-License-Identifier: curl
+ *
+ ***************************************************************************/
+#ifndef CURL_DISABLE_TELNET
+/*
+ * Telnet option defines. Add more here if in need.
+ */
+#define CURL_TELOPT_BINARY 0 /* binary 8bit data */
+#define CURL_TELOPT_ECHO 1 /* just echo! */
+#define CURL_TELOPT_SGA 3 /* Suppress Go Ahead */
+#define CURL_TELOPT_EXOPL 255 /* EXtended OPtions List */
+#define CURL_TELOPT_TTYPE 24 /* Terminal TYPE */
+#define CURL_TELOPT_NAWS 31 /* Negotiate About Window Size */
+#define CURL_TELOPT_XDISPLOC 35 /* X DISPlay LOCation */
+
+#define CURL_TELOPT_NEW_ENVIRON 39 /* NEW ENVIRONment variables */
+#define CURL_NEW_ENV_VAR 0
+#define CURL_NEW_ENV_VALUE 1
+
+#ifndef CURL_DISABLE_VERBOSE_STRINGS
+/*
+ * The telnet options represented as strings
+ */
+static const char * const telnetoptions[]=
+{
+ "BINARY", "ECHO", "RCP", "SUPPRESS GO AHEAD",
+ "NAME", "STATUS", "TIMING MARK", "RCTE",
+ "NAOL", "NAOP", "NAOCRD", "NAOHTS",
+ "NAOHTD", "NAOFFD", "NAOVTS", "NAOVTD",
+ "NAOLFD", "EXTEND ASCII", "LOGOUT", "BYTE MACRO",
+ "DE TERMINAL", "SUPDUP", "SUPDUP OUTPUT", "SEND LOCATION",
+ "TERM TYPE", "END OF RECORD", "TACACS UID", "OUTPUT MARKING",
+ "TTYLOC", "3270 REGIME", "X3 PAD", "NAWS",
+ "TERM SPEED", "LFLOW", "LINEMODE", "XDISPLOC",
+ "OLD-ENVIRON", "AUTHENTICATION", "ENCRYPT", "NEW-ENVIRON"
+};
+#endif
+
+#define CURL_TELOPT_MAXIMUM CURL_TELOPT_NEW_ENVIRON
+
+#define CURL_TELOPT_OK(x) ((x) <= CURL_TELOPT_MAXIMUM)
+#define CURL_TELOPT(x) telnetoptions[x]
+
+#define CURL_NTELOPTS 40
+
+/*
+ * First some defines
+ */
+#define CURL_xEOF 236 /* End Of File */
+#define CURL_SE 240 /* Sub negotiation End */
+#define CURL_NOP 241 /* No OPeration */
+#define CURL_DM 242 /* Data Mark */
+#define CURL_GA 249 /* Go Ahead, reverse the line */
+#define CURL_SB 250 /* SuBnegotiation */
+#define CURL_WILL 251 /* Our side WILL use this option */
+#define CURL_WONT 252 /* Our side WON'T use this option */
+#define CURL_DO 253 /* DO use this option! */
+#define CURL_DONT 254 /* DON'T use this option! */
+#define CURL_IAC 255 /* Interpret As Command */
+
+#ifndef CURL_DISABLE_VERBOSE_STRINGS
+/*
+ * Then those numbers represented as strings:
+ */
+static const char * const telnetcmds[]=
+{
+ "EOF", "SUSP", "ABORT", "EOR", "SE",
+ "NOP", "DMARK", "BRK", "IP", "AO",
+ "AYT", "EC", "EL", "GA", "SB",
+ "WILL", "WONT", "DO", "DONT", "IAC"
+};
+#endif
+
+#define CURL_TELCMD_MINIMUM CURL_xEOF /* the first one */
+#define CURL_TELCMD_MAXIMUM CURL_IAC /* surprise, 255 is the last one! ;-) */
+
+#define CURL_TELQUAL_IS 0
+#define CURL_TELQUAL_SEND 1
+#define CURL_TELQUAL_INFO 2
+#define CURL_TELQUAL_NAME 3
+
+#define CURL_TELCMD_OK(x) ( ((unsigned int)(x) >= CURL_TELCMD_MINIMUM) && \
+ ((unsigned int)(x) <= CURL_TELCMD_MAXIMUM) )
+#define CURL_TELCMD(x) telnetcmds[(x)-CURL_TELCMD_MINIMUM]
+
+#endif /* CURL_DISABLE_TELNET */
+
+#endif /* HEADER_CURL_ARPA_TELNET_H */