1 #![deny(unsafe_op_in_unsafe_fn)]
3 use crate::marker::PhantomData;
4 use crate::os::fd::{AsFd, AsRawFd};
9 pub struct IoSlice<'a> {
11 _p: PhantomData<&'a [u8]>,
14 impl<'a> IoSlice<'a> {
16 pub fn new(buf: &'a [u8]) -> IoSlice<'a> {
17 IoSlice { vec: wasi::Ciovec { buf: buf.as_ptr(), buf_len: buf.len() }, _p: PhantomData }
21 pub fn advance(&mut self, n: usize) {
22 if self.vec.buf_len < n {
23 panic!("advancing IoSlice beyond its length");
27 self.vec.buf_len -= n;
28 self.vec.buf = self.vec.buf.add(n);
33 pub fn as_slice(&self) -> &[u8] {
34 unsafe { slice::from_raw_parts(self.vec.buf as *const u8, self.vec.buf_len) }
39 pub struct IoSliceMut<'a> {
41 _p: PhantomData<&'a mut [u8]>,
44 impl<'a> IoSliceMut<'a> {
46 pub fn new(buf: &'a mut [u8]) -> IoSliceMut<'a> {
48 vec: wasi::Iovec { buf: buf.as_mut_ptr(), buf_len: buf.len() },
54 pub fn advance(&mut self, n: usize) {
55 if self.vec.buf_len < n {
56 panic!("advancing IoSlice beyond its length");
60 self.vec.buf_len -= n;
61 self.vec.buf = self.vec.buf.add(n);
66 pub fn as_slice(&self) -> &[u8] {
67 unsafe { slice::from_raw_parts(self.vec.buf as *const u8, self.vec.buf_len) }
71 pub fn as_mut_slice(&mut self) -> &mut [u8] {
72 unsafe { slice::from_raw_parts_mut(self.vec.buf as *mut u8, self.vec.buf_len) }
76 pub fn is_terminal(fd: &impl AsFd) -> bool {
78 unsafe { libc::isatty(fd.as_raw_fd()) != 0 }