From ec1c94c5dd76df278b9d99e583c325c6baec989d Mon Sep 17 00:00:00 2001
From: scw <scw@63ad8ddf-47c3-0310-b6dd-a9e9d9715204>
Date: Tue, 29 Jun 2004 07:37:22 +0000
Subject: Parse a little TELNET control string. Support big screen on telnet
 connection.

git-svn-id: http://opensvn.csie.org/pttbbs/trunk/pttbbs@2098 63ad8ddf-47c3-0310-b6dd-a9e9d9715204
---
 mbbsd/io.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 55 insertions(+), 2 deletions(-)

(limited to 'mbbsd/io.c')

diff --git a/mbbsd/io.c b/mbbsd/io.c
index 584faa29..3282b041 100644
--- a/mbbsd/io.c
+++ b/mbbsd/io.c
@@ -10,7 +10,7 @@
 #define IBUFSIZE  256
 #endif
 
-static char     outbuf[OBUFSIZE], inbuf[IBUFSIZE];
+static char     outbuf[OBUFSIZE];
 static int      obufsize = 0, ibufsize = 0;
 static int      icurrchar = 0;
 
@@ -47,12 +47,15 @@ oflush()
     }
 }
 
+#if 0
 void
 init_buf()
 {
 
     memset(inbuf, 0, IBUFSIZE);
 }
+#endif
+
 void
 output(char *s, int len)
 {
@@ -121,6 +124,7 @@ dogetch()
 {
     int             len;
     static time_t   lastact;
+    static unsigned char inbuf[IBUFSIZE];
     if (ibufsize <= icurrchar) {
 
 	if (flushf)
@@ -177,7 +181,7 @@ dogetch()
  
 	    }
 #ifdef SKIP_TELNET_CONTROL_SIGNAL
-	} while( inbuf[0] == -1 );
+	} while( inbuf[0] == IAC );
 #endif
 	ibufsize = len;
 	icurrchar = 0;
@@ -223,7 +227,56 @@ igetch()
         else                                       //  here is switch for default keys
 	switch (ch) {
         case IAC:
+#ifndef SKIP_TELNET_CONTROL_SIGNAL
+	    {
+		unsigned char cmd[16];
+		ch = dogetch();
+		switch (ch) {
+		    case IAC:
+			return IAC; /* escaped IAC */
+
+		    case DO:
+			cmd[0] = IAC;
+			cmd[1] = WONT; /* this always work according to rfc 854 */
+			cmd[2] = dogetch();
+			if(cmd[1] != TELOPT_TTYPE && cmd[1] != TELOPT_NAWS &&
+				cmd[1] != TELOPT_ECHO && cmd[1] != TELOPT_SGA)
+			    write(1, cmd, 3);
+			break;
+
+		    case DONT:
+			cmd[0] = IAC;
+			cmd[1] = WONT;
+			cmd[2] = dogetch();
+			write(1, cmd, 3);
+			break;
+
+		    case WILL: case WONT:
+			cmd[2] = dogetch();
+			break;
+
+		    case SB:
+			{
+			    int i;
+			    ch = 0; /* use as mode */
+			    for (i = 2; i < 16; ++i) {
+				cmd[i] = dogetch();
+				if (cmd[i] == IAC)
+				    ch ^= 1;
+				else if (ch && cmd[i] == SE)
+				    break;
+				else
+				    mode = 0;
+			    }
+			}
+			if (cmd[2] == TELOPT_NAWS)
+			    telnet_parse_size(cmd);
+
+		} /* switch first char after IAC */
+	    }
+#endif /* ! defined SKIP_TELNET_CONTROL_SIGNAL */
             continue;
+
 #ifdef DEBUG
 	case Ctrl('Q'):{
 	    struct rusage ru;
-- 
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