how to restrict the numbers of chars in a buffer/file

[Uwe Brauer]

>>>>> "sjt" == Stephen J Turnbull <stephen at xemacs.org> writes:

   sjt> I'd need to know more about the use case to say more about
   sjt> what you *should* do (which hook to use, how to make it
   sjt> convenient, etc), but that should give you an idea of *how* to
   sjt> do it.
Thanks, ok. On the net there are some services which allow you to send
sms messages for almost free. I use mozilla and mozdev, which then
calls (X)Emacs. The thing is that a SMS message should not exceed 150
(or may be 155) chars. So that's why I thought it would be useful to
have even a simple major mode which would allow me not to type more
than 150 chars.

Uwe