format-insert-file
format-insert-file is an interactive compiled Lisp function in `format.el
'.
(format-insert-file FILENAME FORMAT &optional BEG END)
Insert the contents of file FILENAME using data format FORMAT.
If FORMAT is nil then do not do any format conversion.
The optional third and fourth arguments BEG and END specify
the part (in bytes) of the file to read.
The return value is like the value of `insert-file-contents':
a list (ABSOLUTE-FILE-NAME SIZE).