| use crate::marker::PhantomData; |
| use crate::os::fd::{AsFd, AsRawFd}; |
| use crate::slice; |
| |
| use libc::{c_void, iovec}; |
| |
| #[derive(Copy, Clone)] |
| #[repr(transparent)] |
| pub struct IoSlice<'a> { |
| vec: iovec, |
| _p: PhantomData<&'a [u8]>, |
| } |
| |
| impl<'a> IoSlice<'a> { |
| #[inline] |
| pub fn new(buf: &'a [u8]) -> IoSlice<'a> { |
| IoSlice { |
| vec: iovec { iov_base: buf.as_ptr() as *mut u8 as *mut c_void, iov_len: buf.len() }, |
| _p: PhantomData, |
| } |
| } |
| |
| #[inline] |
| pub fn advance(&mut self, n: usize) { |
| if self.vec.iov_len < n { |
| panic!("advancing IoSlice beyond its length"); |
| } |
| |
| unsafe { |
| self.vec.iov_len -= n; |
| self.vec.iov_base = self.vec.iov_base.add(n); |
| } |
| } |
| |
| #[inline] |
| pub fn as_slice(&self) -> &[u8] { |
| unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) } |
| } |
| } |
| |
| #[repr(transparent)] |
| pub struct IoSliceMut<'a> { |
| vec: iovec, |
| _p: PhantomData<&'a mut [u8]>, |
| } |
| |
| impl<'a> IoSliceMut<'a> { |
| #[inline] |
| pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> { |
| IoSliceMut { |
| vec: iovec { iov_base: buf.as_mut_ptr() as *mut c_void, iov_len: buf.len() }, |
| _p: PhantomData, |
| } |
| } |
| |
| #[inline] |
| pub fn advance(&mut self, n: usize) { |
| if self.vec.iov_len < n { |
| panic!("advancing IoSliceMut beyond its length"); |
| } |
| |
| unsafe { |
| self.vec.iov_len -= n; |
| self.vec.iov_base = self.vec.iov_base.add(n); |
| } |
| } |
| |
| #[inline] |
| pub fn as_slice(&self) -> &[u8] { |
| unsafe { slice::from_raw_parts(self.vec.iov_base as *mut u8, self.vec.iov_len) } |
| } |
| |
| #[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) } |
| } |
| } |
| |
| pub fn is_terminal(fd: &impl AsFd) -> bool { |
| let fd = fd.as_fd(); |
| unsafe { libc::isatty(fd.as_raw_fd()) != 0 } |
| } |