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        !            23: .TH CURLOPT_TELNETOPTIONS 3 "May 31, 2017" "libcurl 7.70.0" "curl_easy_setopt options"
        !            24: 
        !            25: .SH NAME
        !            26: CURLOPT_TELNETOPTIONS \- custom telnet options
        !            27: .SH SYNOPSIS
        !            28: #include <curl/curl.h>
        !            29: 
        !            30: CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TELNETOPTIONS,
        !            31:                           struct curl_slist *cmds);
        !            32: .SH DESCRIPTION
        !            33: Provide a pointer to a curl_slist with variables to pass to the telnet
        !            34: negotiations. The variables should be in the format <option=value>. libcurl
        !            35: supports the options 'TTYPE', 'XDISPLOC' and 'NEW_ENV'. See the TELNET
        !            36: standard for details.
        !            37: .SH DEFAULT
        !            38: NULL
        !            39: .SH PROTOCOLS
        !            40: TELNET
        !            41: .SH EXAMPLE
        !            42: .nf
        !            43: CURL *curl = curl_easy_init();
        !            44: if(curl) {
        !            45:   struct curl_slist *options;
        !            46:   options = curl_slist_append(NULL, "TTTYPE=vt100");
        !            47:   options = curl_slist_append(options, "USER=foobar");
        !            48:   curl_easy_setopt(curl, CURLOPT_URL, "telnet://example.com/");
        !            49:   curl_easy_setopt(curl, CURLOPT_TELNETOPTIONS, options);
        !            50:   ret = curl_easy_perform(curl);
        !            51:   curl_easy_cleanup(curl);
        !            52:   curl_slist_free_all(options);
        !            53: }
        !            54: .fi
        !            55: .SH AVAILABILITY
        !            56: Along with TELNET
        !            57: .SH RETURN VALUE
        !            58: Returns CURLE_OK if TELNET is supported, and CURLE_UNKNOWN_OPTION if not.
        !            59: .SH "SEE ALSO"
        !            60: .BR CURLOPT_HTTPHEADER "(3), " CURLOPT_QUOTE "(3), "