In emacs shell and eshell, \r erases the entire current line

Question

In an emacs shell terminal window, running bash, an input of \r moves the insertion point to the start of the line, as expected, but it also erases all data which was on the line. This isn't what I would normally expect from a Terminal.

I understand that shell is not as "complete" as some other terminals, but emacs term and ansi-term can handle this issue, so it doesn't seem to be an inate limitation of emacs.

eshell also behaves like shell. Is there some way to tweak this for shell and/or eshell, so that the following command produces cb and not just c

printf "ab\rc\n"    

#                   gnome     emacs  emacs      emacs  emacs 
# terminal:  xterm  terminal  term   ansi-term  shell  eshell`   
# output:    cb     cb        cb     cb         c      c      

Using: GNU Emacs 23.1.1 in Ubuntu 10.04