cvs-file-to-string is a compiled Lisp function in `pcvs-util.el'.

(cvs-file-to-string FILE &optional ONELINE ARGS)

Read the content of FILE and return it as a string.
If ONELINE is t, only the first line (no \n) will be returned.
If ARGS is non-nil, the file will be executed with ARGS as its
arguments. If ARGS is not a list, no argument will be passed.