49   tcsetattr(0, TCSADRAIN, raw ? &TT.raw_term : &TT.old_term);
54   TT.mode = line ? CM_OFF : CM_ON;  in slc()
62   if (TT.echo) {  in set_mode()
63     if (TT.mode == CM_TRY) slc(0);  in set_mode()
64   } else if (TT.mode != CM_OFF) slc(1);  in set_mode()
91       TT.mode = CM_TRY;  in handle_esc()
92       TT.echo = TT.sga = 0;  in handle_esc()
94       dprintf(TT.sock,"%c%c%c%c%c%c",IAC,DONT,TELOPT_ECHO,IAC,DONT,TELOPT_SGA);  in handle_esc()
99       TT.mode = CM_TRY;  in handle_esc()
100       TT.echo = TT.sga = 1;  in handle_esc()
102       dprintf(TT.sock,"%c%c%c%c%c%c",IAC,DO,TELOPT_ECHO,IAC,DO,TELOPT_SGA);  in handle_esc()
122     if (TT.request == DO) dprintf(TT.sock, "%c%c%c", IAC, WONT, TELOPT_ECHO);  in handle_wwdd()
123     if (TT.request == DONT) return;  in handle_wwdd()
124     if (TT.echo) {  in handle_wwdd()
125         if (TT.request == WILL) return;  in handle_wwdd()
126     } else if (TT.request == WONT) return;  in handle_wwdd()
127     if (TT.mode != CM_OFF) TT.echo ^= 1;  in handle_wwdd()
128     dprintf(TT.sock, "%c%c%c", IAC, TT.echo ? DO : DONT, TELOPT_ECHO);  in handle_wwdd()
131     if (TT.sga) {  in handle_wwdd()
132       if (TT.request == WILL) return;  in handle_wwdd()
133     } else if (TT.request == WONT) return;  in handle_wwdd()
134     TT.sga ^= 1;  in handle_wwdd()
135     dprintf(TT.sock, "%c%c%c", IAC, TT.sga ? DO : DONT, TELOPT_SGA);  in handle_wwdd()
137     dprintf(TT.sock, "%c%c%c", IAC, WILL, TELOPT_TTYPE);  in handle_wwdd()
142     dprintf(TT.sock, "%c%c%c%c%c%c%c%c%c%c%c%c", IAC, WILL, TELOPT_NAWS,  in handle_wwdd()
147     dprintf(TT.sock, "%c%c%c", IAC, (TT.request == WILL) ? DONT : WONT, opt);  in handle_wwdd()
153   char *p = TT.buf, *end = TT.buf + n, ch;  in handle_server_output()
169     if (TT.state == SAW_IAC) {  in handle_server_output()
171         TT.state = SAW_WWDD;  in handle_server_output()
172         TT.request = ch;  in handle_server_output()
174         TT.state = SAW_SB;  in handle_server_output()
176         TT.state = NORMAL;  in handle_server_output()
178     } else if (TT.state == SAW_WWDD) {  in handle_server_output()
180       TT.state = NORMAL;  in handle_server_output()
181     } else if (TT.state == SAW_SB) {  in handle_server_output()
182       if (ch == TELOPT_TTYPE) TT.state = SAW_SB_TTYPE;  in handle_server_output()
183       else TT.state = WANT_IAC;  in handle_server_output()
184     } else if (TT.state == SAW_SB_TTYPE) {  in handle_server_output()
186         dprintf(TT.sock, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE, TELQUAL_IS,  in handle_server_output()
189       TT.state = WANT_IAC;  in handle_server_output()
190     } else if (TT.state == WANT_IAC) {  in handle_server_output()
191       if (ch == IAC) TT.state = WANT_SE;  in handle_server_output()
192     } else if (TT.state == WANT_SE) {  in handle_server_output()
193       if (ch == SE) TT.state = NORMAL;  in handle_server_output()
195       TT.state = SAW_IAC;  in handle_server_output()
197       if (TT.state == SAW_CR && ch == '\0') {  in handle_server_output()
200       if (ch == '\r') TT.state = SAW_CR;  in handle_server_output()
201       TT.state = NORMAL;  in handle_server_output()
209   char *p = TT.buf, ch;  in handle_user_input()
226   if (i) xwrite(TT.sock, toybuf, i);  in handle_user_input()
239   tcgetattr(0, &TT.old_term);  in telnet_main()
240   TT.raw_term = TT.old_term;  in telnet_main()
241   cfmakeraw(&TT.raw_term);  in telnet_main()
243   TT.sock = xconnectany(xgetaddrinfo(*toys.optargs, toys.optargs[1] ?: "23", 0,  in telnet_main()
245   xsetsockopt(TT.sock, SOL_SOCKET, SO_KEEPALIVE, &n, sizeof(n));  in telnet_main()
254   pfds[1].fd = TT.sock;  in telnet_main()
262       if ((n = read(0, TT.buf, sizeof(TT.buf))) <= 0) xexit();  in telnet_main()
266       if ((n = read(TT.sock, TT.buf, sizeof(TT.buf))) <= 0)  in telnet_main()