Function svn_fs_is_file 

pub unsafe extern "C" fn svn_fs_is_file(
    is_file: *mut svn_boolean_t,
    root: *mut svn_fs_root_t,
    path: *const c_char,
    pool: *mut apr_pool_t,
) -> *mut svn_error_t

Set @a *is_file to @c TRUE iff @a path in @a root is a file. Do any necessary temporary allocation in @a pool.