Telnet program backspace issue

[dassudheer]

Issue with telnet backspace/delete

I have telnet server code which listens at 23 port.

1) Connect to the telnet server using windows telnet client
2) Enter multi line command(which wrap's into more than 1 line).
3) keep on deleting characters by pressing "Backspace" button.
4) Unable to move to previous line.

I the code I noticed that we are issuing /b when backspace (ASCII 0 is pressed.


Is there any way to position the cursor at previous line end..?

[Rubberman]

It really depends upon the term settings you are using, and the client whether or not the cursor will wrap backwards. I did this years ago (about 20) when I wrote a clean-room implementation of telnet (client and server). This problem was solved by building a good terminal emulator to run on top of the telnet client code. Most of the time these days, you run telnet clients in a console window, such as an xterm or whatever. So, the question is, what is the client system? Linux? What command-line window type are you using?

[dassudheer]

I'm using Windows Telnet to connect my application.

[Rubberman]

I'm using Windows Telnet to connect my application.

Yes, well that isn't a particularly capable terminal emulator, in my experience. You might try a 3rd party tool, such as putty, or install Cygwin and use its telnet client.

[dassudheer]

from the same windows telnet I connected to UBUNTU Telnet Server(normal system). It's able to move to previous line when i hit backspace.

[Rubberman]

from the same windows telnet I connected to UBUNTU Telnet Server(normal system). It's able to move to previous line when i hit backspace.

Ok. On Ubuntu this works. What systems does it NOT work? FWIW, the last time I used Windows telnet was back in early NT days, so it may well have been improved since then (one would hope), given that I did the telnet implementation in the 1991-1992 time frame...