Applies the rawon/rawoff fix to vncs. I used the code
from 9/port/devcons.c, which works perfectly and can
be understood :-)

Reference: /n/sources/patch/applied/rawfix
Date: Fri Nov 11 09:07:32 CET 2005

--- /sys/src/cmd/vnc/devcons.c	Fri Nov 11 09:06:50 2005
+++ /sys/src/cmd/vnc/devcons.c	Fri Nov 11 09:06:47 2005
@@ -230,7 +230,7 @@
 		qunlock(&kbd);
 		break;
 	case Qsnarf:
-		if(c->mode == OWRITE || c->mode == ORDWR)
+		if((c->mode&3) == OWRITE || (c->mode&3) == ORDWR)
 			c->aux = smalloc(sizeof(Snarf));
 		break;
 	}
@@ -289,8 +289,9 @@
 static long
 consread(Chan *c, void *buf, long n, vlong off)
 {
-	char *cbuf;
-	int i, ch, eol;
+	char *cbuf, ch;
+	int i, eol;
+	int	send;
 
 	if(n <= 0)
 		return n;
@@ -315,48 +316,40 @@
 			qunlock(&kbd);
 			nexterror();
 		}
-		if(kbd.raw){
-			cbuf = buf;
-			if(qcanread(lineq))
-				n = qread(lineq, buf, n);
-			else {
-				/* read as much as possible */
-				do {
-					i = qread(kbdq, cbuf, n);
-					cbuf += i;
-					n -= i;
-				} while (n>0 && qcanread(kbdq));
-				n = cbuf - (char*)buf;
-			}
-		} else {
-			while(!qcanread(lineq)){
-				qread(kbdq, &kbd.line[kbd.x], 1);
-				ch = kbd.line[kbd.x];
-				eol = 0;
+		while(!qcanread(lineq)){
+			qread(kbdq, &ch, 1);
+			send = 0;
+			if(ch == 0){
+				/* flush output on rawoff -> rawon */
+				if(kbd.x > 0)
+					send = !qcanread(kbdq);
+			}else if(kbd.raw){
+				kbd.line[kbd.x++] = ch;
+				send = !qcanread(kbdq);
+			}else{
 				switch(ch){
 				case '\b':
-					if(kbd.x)
+					if(kbd.x > 0)
 						kbd.x--;
 					break;
-				case 0x15:
+				case 0x15:	/* ^U */
 					kbd.x = 0;
 					break;
 				case '\n':
-				case 0x04:
-					eol = 1;
+				case 0x04:	/* ^D */
+					send = 1;
 				default:
-					kbd.line[kbd.x++] = ch;
+					if(ch != 0x04)
+						kbd.line[kbd.x++] = ch;
 					break;
 				}
-				if(kbd.x == sizeof(kbd.line) || eol){
-					if(ch == 0x04)
-						kbd.x--;
-					qwrite(lineq, kbd.line, kbd.x);
-					kbd.x = 0;
-				}
 			}
-			n = qread(lineq, buf, n);
+			if(send || kbd.x == sizeof kbd.line){
+				qwrite(lineq, kbd.line, kbd.x);
+				kbd.x = 0;
+			}
 		}
+		n = qread(lineq, buf, n);
 		qunlock(&kbd);
 		poperror();
 		return n;
@@ -373,6 +366,7 @@
 {
 	Snarf *t;
 	char buf[256], *a;
+	char ch;
 
 	switch((ulong)c->qid.path){
 	case Qcons:
@@ -386,18 +380,12 @@
 		buf[n] = 0;
 		for(a = buf; a;){
 			if(strncmp(a, "rawon", 5) == 0){
-				qlock(&kbd);
-				if(kbd.x){
-					qwrite(kbdq, kbd.line, kbd.x);
-					kbd.x = 0;
-				}
 				kbd.raw = 1;
-				qunlock(&kbd);
+				/* clumsy hack - wake up reader */
+				ch = 0;
+				qwrite(kbdq, &ch, 1);			
 			} else if(strncmp(a, "rawoff", 6) == 0){
-				qlock(&kbd);
 				kbd.raw = 0;
-				kbd.x = 0;
-				qunlock(&kbd);
 			}
 			if(a = strchr(a, ' '))
 				a++;