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use super::*;
#[cfg(feature = "specialization")]
#[doc(cfg(feature = "specialization"))]
default
unsafe impl<R : Read> ReadIntoUninit for R {
#[inline]
default
fn read_into_uninit<'buf> (
self: &'_ mut Self,
buf: Out<'buf, [u8]>,
) -> io::Result<&'buf mut [u8]>
{
let buf = buf.init_with(::core::iter::repeat(0));
self.read(buf)
.map(move |n| &mut buf[.. n])
}
#[inline]
default
fn read_into_uninit_exact<'buf> (
self: &'_ mut Self,
buf: Out<'buf, [u8]>,
) -> io::Result<&'buf mut [u8]>
{
let buf = buf.init_with(::core::iter::repeat(0));
self.read_exact(buf)
.map(|()| buf)
}
}
unsafe
impl<R : ReadIntoUninit + ?Sized> ReadIntoUninit for &'_ mut R {
#[inline]
fn read_into_uninit<'buf> (
self: &'_ mut Self,
buf: Out<'buf, [u8]>,
) -> io::Result<&'buf mut [u8]>
{
(**self).read_into_uninit(buf)
}
}
unsafe
impl ReadIntoUninit for &'_ [u8] {
#[inline]
fn read_into_uninit<'buf> (
self: &'_ mut Self,
buf: Out<'buf, [u8]>,
) -> io::Result<&'buf mut [u8]>
{
let count = ::std::cmp::min(buf.len(), self.len());
let (to_copy, remaining) = self.split_at(count);
*self = remaining;
if count == 1 {
Ok( slice::from_mut(buf.get_out(0).unwrap().write(to_copy[0])) )
} else {
Ok( buf.get_out(.. count).unwrap().copy_from_slice(to_copy) )
}
}
}
macro_rules! impl_ReadIntoUninit_for_impl_BufRead {(
$(
for [$($generics:tt)*]
$T:ty
$(where {
$($wc:tt)*
})? ;
)*
) => (
$(
unsafe
impl<$($generics)*> ReadIntoUninit
for $T
$(where
$($wc)*
)?
{
#[inline]
fn read_into_uninit<'buf> (
self: &'_ mut Self,
buf: Out<'buf, [u8]>,
) -> io::Result<&'buf mut [u8]>
{
let buf = {
let mut read_buf: &[u8] = io::BufRead::fill_buf(self)?;
read_buf.read_into_uninit(buf)?
};
io::BufRead::consume(self, buf.len());
Ok(buf)
}
}
)*
)}
impl_ReadIntoUninit_for_impl_BufRead! {
for [R : io::Read]
io::BufReader<R>
;
for [T : AsRef<[u8]>]
io::Cursor<T>
;
for []
io::Empty
;
for []
io::StdinLock<'_>
;
for [T : io::BufRead]
io::Take<T>
;
}
unsafe
impl<R : ReadIntoUninit + ?Sized> ReadIntoUninit for Box<R> {
#[inline]
fn read_into_uninit<'buf> (
self: &'_ mut Self,
buf: Out<'buf, [u8]>,
) -> io::Result<&'buf mut [u8]>
{
(**self).read_into_uninit(buf)
}
}