| //! The following is derived from Rust's |
| //! library/std/src/sys/unix/io.rs |
| //! dca3f1b786efd27be3b325ed1e01e247aa589c3b. |
| //! |
| //! All code in this file is licensed MIT or Apache 2.0 at your option. |
| |
| #![allow(unsafe_code)] |
| use crate::backend::c; |
| #[cfg(not(linux_raw))] |
| use c::size_t as __kernel_size_t; |
| use core::marker::PhantomData; |
| use core::slice; |
| #[cfg(linux_raw)] |
| use linux_raw_sys::general::__kernel_size_t; |
| |
| /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html> |
| #[derive(Copy, Clone)] |
| #[repr(transparent)] |
| pub struct IoSlice<'a> { |
| vec: c::iovec, |
| _p: PhantomData<&'a [u8]>, |
| } |
| |
| impl<'a> IoSlice<'a> { |
| /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.new> |
| #[inline] |
| pub fn new(buf: &'a [u8]) -> IoSlice<'a> { |
| IoSlice { |
| vec: c::iovec { |
| iov_base: buf.as_ptr() as *mut u8 as *mut c::c_void, |
| iov_len: buf.len() as _, |
| }, |
| _p: PhantomData, |
| } |
| } |
| |
| /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.advance> |
| #[inline] |
| pub fn advance(&mut self, n: usize) { |
| if self.vec.iov_len < n as _ { |
| panic!("advancing IoSlice beyond its length"); |
| } |
| |
| unsafe { |
| // `__kernel_size_t` will always have the same size as `usize`, but it is a `u32` on |
| // 32-bit platforms and `u64` on 64-bit platforms when using `linux_raw` backend |
| self.vec.iov_len -= n as __kernel_size_t; |
| self.vec.iov_base = self.vec.iov_base.add(n); |
| } |
| } |
| |
| /// <https://doc.rust-lang.org/stable/std/io/struct.IoSlice.html#method.as_slice> |
| #[inline] |
| pub fn as_slice(&self) -> &[u8] { |
| unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len as usize) } |
| } |
| } |
| |
| /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html> |
| #[repr(transparent)] |
| pub struct IoSliceMut<'a> { |
| vec: c::iovec, |
| _p: PhantomData<&'a mut [u8]>, |
| } |
| |
| impl<'a> IoSliceMut<'a> { |
| /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.new> |
| #[inline] |
| pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> { |
| IoSliceMut { |
| vec: c::iovec { |
| iov_base: buf.as_mut_ptr() as *mut c::c_void, |
| iov_len: buf.len() as _, |
| }, |
| _p: PhantomData, |
| } |
| } |
| |
| /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.advance> |
| #[inline] |
| pub fn advance(&mut self, n: usize) { |
| if self.vec.iov_len < n as _ { |
| panic!("advancing IoSliceMut beyond its length"); |
| } |
| |
| unsafe { |
| // `__kernel_size_t` will always have the same size as `usize`, but it is a `u32` on |
| // 32-bit platforms and `u64` on 64-bit platforms when using `linux_raw` backend |
| self.vec.iov_len -= n as __kernel_size_t; |
| self.vec.iov_base = self.vec.iov_base.add(n); |
| } |
| } |
| |
| /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.as_slice> |
| #[inline] |
| pub fn as_slice(&self) -> &[u8] { |
| unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len as usize) } |
| } |
| |
| /// <https://doc.rust-lang.org/stable/std/io/struct.IoSliceMut.html#method.as_slice_mut> |
| #[inline] |
| pub fn as_mut_slice(&mut self) -> &mut [u8] { |
| unsafe { |
| slice::from_raw_parts_mut(self.vec.iov_base as *mut u8, self.vec.iov_len as usize) |
| } |
| } |
| } |