remove unsafe and newlines, add notice

Author: newpavlov

src/dragonfly_haiku.rs

@@ -20,4 +20,3 @@ pub fn getrandom(dest: &mut [u8]) -> Result<(), Error> {
         use_init(f, || File::open("/dev/random"), |f| f.read_exact(dest))
     }).map_err(|_| Error::Unknown)
 }
-

src/emscripten.rs

@@ -29,4 +29,3 @@ pub fn getrandom(dest: &mut [u8]) -> Result<(), Error> {
         })
     }).map_err(|_| Error::Unknown)
 }
-

src/freebsd.rs

@@ -29,4 +29,3 @@ pub fn getrandom(dest: &mut [u8]) -> Result<(), Error> {
     }
     Ok(())
 }
-

src/fuchsia.rs

@@ -15,4 +15,3 @@ pub fn getrandom(dest: &mut [u8]) -> Result<(), Error> {
     fuchsia_cprng::cprng_draw(dest);
     Ok(())
 }
-

src/lib.rs

@@ -111,4 +111,3 @@ mod_use!(
     ))),
     dummy
 );
-

src/netbsd.rs

@@ -26,4 +26,3 @@ pub fn getrandom(dest: &mut [u8]) -> Result<(), Error> {
         }, |f| f.read_exact(dest))
     }).map_err(|_| Error::Unknown)
 }
-

src/openbsd_bitrig.rs

@@ -25,4 +25,3 @@ pub fn getrandom(dest: &mut [u8]) -> Result<(), Error> {
     }
     Ok(())
 }
-

src/redox.rs

@@ -20,4 +20,3 @@ pub fn getrandom(dest: &mut [u8]) -> Result<(), Error> {
         use_init(f, || File::open("rand:"), |f| f.read_exact(dest))
     }).map_err(|_| Error::Unknown)
 }
-

src/utils.rs

@@ -1,7 +1,17 @@
+// Copyright 2018 Developers of the Rand project.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
 use std::cell::RefCell;
 use std::ops::DerefMut;
-use std::{io, hint};
+use std::io;
 
+/// If `f` contains `Some(T)` call `use_f` using contents of `f` as an argument,
+/// otherwise initialize `f` value using `init_f`, store resulting value in `f`
+/// and call `use_f`.
 pub(crate) fn use_init<T, F, U>(f: &RefCell<Option<T>>, init_f: F, mut use_f: U)
     -> io::Result<()>
     where F: FnOnce() -> io::Result<T>, U: FnMut(&mut T) -> io::Result<()>
@@ -15,7 +25,6 @@ pub(crate) fn use_init<T, F, U>(f: &RefCell<Option<T>>, init_f: F, mut use_f: U)
 
     match f {
         Some(f) => use_f(f),
-        None => unsafe { hint::unreachable_unchecked() },
+        None => unreachable!(),
     }
 }
-