c-guessc-guess is an interactive autoloaded compiled Lisp function in `
(c-guess &optional ACCUMULATE)
Guess the style in the region up to `c-guess-region-max', and install it.
The style is given a name based on the file's absolute file name.
If given a prefix argument (or if the optional argument ACCUMULATE is
non-nil) then the previous guess is extended, otherwise a new guess is
made from scratch.