[BusyBox] (fwd) BusyBox - telnet

[Vladimir N. Oleynik]

Przemyslaw,

> Is someone interested in it?

Yes.
 
> There was three problems:
> 
> 1. busybox-telnet dosn't inform server about the size of terminal screen.
>    In the world of xterminals and frame buffers it's rather horrible
>    to use fixed 80x24 region in upper-left corner of screen/window.
>
> 2. If client sends character 0x0d to the server then sends character 0x0a
>    the server eat the second byte (0x0a) - it's described in telnet RFC.
>    Client should send two bytes ( 0x0d + 0x0a or 0x0d + 0x00 ) insted of
>    one 0x0d byte.
> 
> 3. busybox telnet implementation wasn't 8bit clean (look at 0xff byte).
>    I need it because I have to use binray transfer like rz/sz. So when
>    I resloved the problem (2) I corrected this one two.

Good work.
 
>   --------------------------------------------------------------------------------
>                        Name: busybox.patch.gz
>    busybox.patch.gz    Type: unspecified type (application/octet-stream)
>                    Encoding: base64

-+       byte outbuf[2048];
++	byte outbuf[4*DATABUFSIZE];

+       for (i = len, j = 0; i > 0; i--, p++)
+       {
+               if (*p == 0x1d)
+               {
+                       conescape();
+                       return;
+               }
+               outbuf[j++] = *p;
+               if (*p == 0xff)
+                   outbuf[j++] = 0xff;
+               else if (*p == 0x0d)
+                   outbuf[j++] = 0x00;
+
-+               if ( j >= sizeof(outbuf)-2 )
-+               {
-+                   write(G.netfd, outbuf, j);
-+                   j = 0;
-+               }
+       }
+       if (j > 0 )
+           write(G.netfd, outbuf, j);
+/*