+ static int
+telsnd()
+{
+ int tcc;
+ int count;
+ int returnValue = 0;
+ unsigned char *tbp;
+
+ tcc = 0;
+ count = 0;
+ while (NETROOM() > 2) {
+ register int sc;
+ register int c;
+
+ if (tcc == 0) {
+ if (count) {
+ ring_consumed(&ttyiring, count);
+ returnValue = 1;
+ count = 0;
+ }
+ tbp = ttyiring.consume;
+ tcc = ring_full_consecutive(&ttyiring);
+ if (tcc == 0) {
+ break;
+ }
+ }
+ c = *tbp++ & 0xff, sc = strip(c), tcc--; count++;
+ if (rlogin != _POSIX_VDISABLE) {
+ if (bol) {
+ bol = 0;
+ if (sc == rlogin) {
+ local = 1;
+ continue;
+ }
+ } else if (local) {
+ local = 0;
+ if (sc == '.' || c == termEofChar) {
+ bol = 1;
+ command(0, "close\n", 6);
+ continue;
+ }
+ if (sc == termSuspChar) {
+ bol = 1;
+ command(0, "z\n", 2);
+ continue;
+ }
+ if (sc == escape) {
+ command(0, (char *)tbp, tcc);
+ bol = 1;
+ count += tcc;
+ tcc = 0;
+ flushline = 1;
+ break;
+ }
+ if (sc != rlogin) {
+ ++tcc;
+ --tbp;
+ --count;
+ c = sc = rlogin;
+ }
+ }
+ if ((sc == '\n') || (sc == '\r'))
+ bol = 1;
+ } else if (sc == escape) {
+ /*
+ * Double escape is a pass through of a single escape character.
+ */
+ if (tcc && strip(*tbp) == escape) {
+ tbp++;
+ tcc--;
+ count++;
+ bol = 0;
+ } else {
+ command(0, (char *)tbp, tcc);
+ bol = 1;
+ count += tcc;
+ tcc = 0;
+ flushline = 1;
+ break;
+ }
+ } else
+ bol = 0;
+#ifdef KLUDGELINEMODE
+ if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) {
+ if (tcc > 0 && strip(*tbp) == echoc) {
+ tcc--; tbp++; count++;
+ } else {
+ dontlecho = !dontlecho;
+ settimer(echotoggle);
+ setconnmode(0);
+ flushline = 1;
+ break;
+ }
+ }
+#endif
+ if (MODE_LOCAL_CHARS(globalmode)) {
+ if (TerminalSpecialChars(sc) == 0) {
+ bol = 1;
+ break;
+ }
+ }
+ if (my_want_state_is_wont(TELOPT_BINARY)) {
+ switch (c) {
+ case '\n':
+ /*
+ * If we are in CRMOD mode (\r ==> \n)
+ * on our local machine, then probably
+ * a newline (unix) is CRLF (TELNET).
+ */
+ if (MODE_LOCAL_CHARS(globalmode)) {
+ NETADD('\r');
+ }
+ NETADD('\n');
+ bol = flushline = 1;
+ break;
+ case '\r':
+ if (!crlf) {
+ NET2ADD('\r', '\0');
+ } else {
+ NET2ADD('\r', '\n');
+ }
+ bol = flushline = 1;
+ break;
+ case IAC:
+ NET2ADD(IAC, IAC);
+ break;
+ default:
+ NETADD(c);
+ break;
+ }
+ } else if (c == IAC) {
+ NET2ADD(IAC, IAC);
+ } else {
+ NETADD(c);
+ }
+ }
+ if (count)
+ ring_consumed(&ttyiring, count);
+ return returnValue||count; /* Non-zero if we did anything */
+}
+\f
+/*
+ * Scheduler()
+ *
+ * Try to do something.
+ *
+ * If we do something useful, return 1; else return 0.
+ *
+ */
+
+
+ int
+Scheduler(block)
+ int block; /* should we block in the select ? */
+{
+ /* One wants to be a bit careful about setting returnValue
+ * to one, since a one implies we did some useful work,
+ * and therefore probably won't be called to block next
+ * time (TN3270 mode only).
+ */
+ int returnValue;
+ int netin, netout, netex, ttyin, ttyout;
+
+ /* Decide which rings should be processed */
+
+ netout = ring_full_count(&netoring) &&
+ (flushline ||
+ (my_want_state_is_wont(TELOPT_LINEMODE)
+#ifdef KLUDGELINEMODE
+ && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA))
+#endif
+ ) ||
+ my_want_state_is_will(TELOPT_BINARY));
+ ttyout = ring_full_count(&ttyoring);
+
+#if defined(TN3270)
+ ttyin = ring_empty_count(&ttyiring) && (shell_active == 0);
+#else /* defined(TN3270) */
+ ttyin = ring_empty_count(&ttyiring);
+#endif /* defined(TN3270) */
+
+#if defined(TN3270)
+ netin = ring_empty_count(&netiring);
+# else /* !defined(TN3270) */
+ netin = !ISend && ring_empty_count(&netiring);
+# endif /* !defined(TN3270) */
+
+ netex = !SYNCHing;
+
+ /* If we have seen a signal recently, reset things */
+# if defined(TN3270) && defined(unix)
+ if (HaveInput) {
+ HaveInput = 0;
+ (void) signal(SIGIO, inputAvailable);
+ }
+#endif /* defined(TN3270) && defined(unix) */
+
+ /* Call to system code to process rings */
+
+ returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block);
+
+ /* Now, look at the input rings, looking for work to do. */
+
+ if (ring_full_count(&ttyiring)) {
+# if defined(TN3270)
+ if (In3270) {
+ int c;
+
+ c = DataFromTerminal(ttyiring.consume,
+ ring_full_consecutive(&ttyiring));
+ if (c) {
+ returnValue = 1;
+ ring_consumed(&ttyiring, c);
+ }
+ } else {
+# endif /* defined(TN3270) */
+ returnValue |= telsnd();
+# if defined(TN3270)
+ }
+# endif /* defined(TN3270) */
+ }
+
+ if (ring_full_count(&netiring)) {
+# if !defined(TN3270)
+ returnValue |= telrcv();
+# else /* !defined(TN3270) */
+ returnValue = Push3270();
+# endif /* !defined(TN3270) */
+ }
+ return returnValue;
+}
+\f
+/*
+ * Select from tty and network...
+ */
+ void
+telnet(user)
+ char *user;
+{
+ sys_telnet_init();
+
+#if defined(ENCRYPT) || defined(AUTHENTICATE)
+ {
+ static char local_host[256] = { 0 };
+ int len = sizeof(local_host);
+
+ if (!local_host[0]) {
+ gethostname(local_host, &len);
+ local_host[sizeof(local_host)-1] = 0;
+ }
+ auth_encrypt_init(local_host, hostname, "TELNET", 0);
+ auth_encrypt_user(user);
+ }
+#endif
+# if !defined(TN3270)
+ if (telnetport) {
+#if defined(AUTHENTICATE)
+ if (autologin)
+ send_will(TELOPT_AUTHENTICATION, 1);
+#endif
+#if defined(ENCRYPT)
+ send_do(TELOPT_ENCRYPT, 1);
+ send_will(TELOPT_ENCRYPT, 1);
+#endif
+ send_do(TELOPT_SGA, 1);
+ send_will(TELOPT_TTYPE, 1);
+ send_will(TELOPT_NAWS, 1);
+ send_will(TELOPT_TSPEED, 1);
+ send_will(TELOPT_LFLOW, 1);
+ send_will(TELOPT_LINEMODE, 1);
+ send_will(TELOPT_ENVIRON, 1);
+ send_do(TELOPT_STATUS, 1);
+ if (env_getvalue((unsigned char *)"DISPLAY"))
+ send_will(TELOPT_XDISPLOC, 1);
+ if (eight)
+ tel_enter_binary(eight);
+ }
+# endif /* !defined(TN3270) */
+
+# if !defined(TN3270)
+ for (;;) {
+ int schedValue;
+
+ while ((schedValue = Scheduler(0)) != 0) {
+ if (schedValue == -1) {
+ setcommandmode();
+ return;
+ }
+ }
+
+ if (Scheduler(1) == -1) {
+ setcommandmode();
+ return;
+ }
+ }
+# else /* !defined(TN3270) */
+ for (;;) {
+ int schedValue;
+
+ while (!In3270 && !shell_active) {
+ if (Scheduler(1) == -1) {
+ setcommandmode();
+ return;
+ }
+ }
+
+ while ((schedValue = Scheduler(0)) != 0) {
+ if (schedValue == -1) {
+ setcommandmode();
+ return;
+ }
+ }
+ /* If there is data waiting to go out to terminal, don't
+ * schedule any more data for the terminal.
+ */
+ if (ring_full_count(&ttyoring)) {
+ schedValue = 1;
+ } else {
+ if (shell_active) {
+ if (shell_continue() == 0) {
+ ConnectScreen();
+ }
+ } else if (In3270) {
+ schedValue = DoTerminalOutput();
+ }
+ }
+ if (schedValue && (shell_active == 0)) {
+ if (Scheduler(1) == -1) {
+ setcommandmode();
+ return;
+ }
+ }
+ }
+# endif /* !defined(TN3270) */
+}
+\f
+#if 0 /* XXX - this not being in is a bug */