hi.
i am developing a small module for the linux 2.6.14 kernel.
so far i have been able to create the character devices that will contain any kind of char data i send them.

for example, if i type
and then
then the output will be

but now i would like to alter the result of the last cat comment.
let's say i want to swap the letter O with the letter X so that the output will be:


HELLX WXRLD

i suppose the main task is to modify the copy_to_user buffer, but I have absolutely no idea of doing it.
any suggestion will be gladfully accepted.

thanks guys