Hello,

The current command mechanism doesn't provide a way for a call-back 
function (cfunc or sfunc) to bind a local state/context to a command. 
Consequently, it isn't possible to use a single callback function as a 
generic handler for a number of similar commands.

For instance the ``set/show remote ...'' (remote.c) each require an 
individual wrapper function.  By adding a context/state, it becomes 
possible for a common function to handle all cases.

I can think of two ways of implementing this.  Using:

set_cmd_context() / get_cmd_context()

as with this patch; or add a new callback function that takes an 
additional context parameter vis:

set_cmd_ccfunc(cmd, void (*ccfunc) (c, cmd, tty, context), context);

The choice, I think is pretty arbitrary and I'm happy to change it to 
either.

Preference?  Ok?

Andrew