45  * Buffer for sub-options, and macros
57 #define	SB_LEN()	(subend - subpointer)
71 #define	TS_CR		2	/* CR-LF ->'s CR */
75 #define	TS_WONT		6	/* wont -''- */
76 #define	TS_DO		7	/* do -''- */
77 #define	TS_DONT		8	/* dont -''- */
86 	if ((&ptyobuf[BUFSIZ] - pfrontp) < 2)  in telrcv()
88 	c = *netip++ & 0377, ncc--;  in telrcv()
110 	     * Many client implementations send \r\n when  in telrcv()
128 			(void)(*decrypt_input)(-1);  in telrcv()
140 	     * Send the process on the pty side an  in telrcv()
172 		ptyflush();	/* half-hearted */  in telrcv()
183 		neturg = nfrontp-1; /* off by one XXX */  in telrcv()
185 		     printoption("td: send IAC", DM));  in telrcv()
200 		ptyflush();	/* half-hearted */  in telrcv()
296 		    subpointer -= 2;  in telrcv()
309 		subpointer -= 2;  in telrcv()
312 		suboption();	/* handle sub-option */  in telrcv()
363  *	send new_state;
370  *	want_resp--;
372  *		want_resp--;
379  *	send want_state;
386  * Finally, there is one catch.  If we send a negative response to a
411 	 * Special case for TELOPT_TM:  We send a DO, but pretend  in send_do()
412 	 * that we sent a DONT, so that we can send more DOs if  in send_do()
423     DIAG(TD_OPTIONS, printoption("td: send do", option));  in send_do()
446 	do_dont_resp[option]--;  in willoption()
448 	    do_dont_resp[option]--;  in willoption()
539 		 * respond WONT TM to the DO TM that we send to  in willoption()
545 		 * linemode is off and send a WILL ECHO  in willoption()
586     DIAG(TD_OPTIONS, printoption("td: send dont", option));  in send_dont()
599 	do_dont_resp[option]--;  in wontoption()
601 	    do_dont_resp[option]--;  in wontoption()
647 		 * sub-negotiation, if the client turns off the  in wontoption()
650 		 * to the sub-negotiation, (by updating the timers)  in wontoption()
710     DIAG(TD_OPTIONS, printoption("td: send will", option));  in send_will()
718  * we'll keep them in char-at-a-time mode.
734 	will_wont_resp[option]--;  in dooption()
736 	    will_wont_resp[option]--;  in dooption()
767 	     * Special case for TM.  We send a WILL, but  in dooption()
832     DIAG(TD_OPTIONS, printoption("td: send wont", option));  in send_wont()
846 	will_wont_resp[option]--;  in dontoption()
848 	    will_wont_resp[option]--;  in dontoption()
888 int env_ovar = -1;
889 int env_ovalue = -1;
898  *	Look at the sub-option buffer, and try to be helpful to the other
954 	while ((p < (terminaltype + sizeof terminaltype-1)) &&  in suboption()
1058 		    int last = -1;		/* invalid value */  in suboption()
1059 		    int empty = 0;  in suboption()  local
1081 				|| (empty && (last == OLD_ENV_VALUE)))  in suboption()
1088 				|| (empty && (last == OLD_ENV_VAR)))  in suboption()
1097 			    if (empty) {  in suboption()
1110 			    empty = 0;  in suboption()
1113 			empty = 1;  in suboption()
1115 		    if (empty) {  in suboption()
1124 		     * and none of the VAR or VALUE commands are empty.  in suboption()
1125 		     * If the client has sent us a well-formed option,  in suboption()
1257 	     * We can always send an REQEND so that we cannot  in suboption()
1313      * don't support, and the other side didn't send a DONT/WONT  in send_status()
1355     writenet(statusbuf, ncp - statusbuf);  in send_status()
1356     netflush();	/* Send it on its way */  in send_status()
1359 	 {printsub('>', statusbuf, ncp - statusbuf); netflush();});  in send_status()