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#![deny(unsafe_op_in_unsafe_fn)]
use super::fd::WasiFd;
use crate::io::{self, IoSlice, IoSliceMut};
use crate::mem::ManuallyDrop;
use crate::os::raw;
use crate::os::wasi::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd};
pub struct Stdin;
pub struct Stdout;
pub struct Stderr;
impl Stdin {
pub const fn new() -> Stdin {
Stdin
}
}
impl AsRawFd for Stdin {
#[inline]
fn as_raw_fd(&self) -> raw::c_int {
0
}
}
impl AsFd for Stdin {
#[inline]
fn as_fd(&self) -> BorrowedFd<'_> {
unsafe { BorrowedFd::borrow_raw(0) }
}
}
#[stable(feature = "io_safety", since = "1.63.0")]
impl<'a> AsFd for io::StdinLock<'a> {
#[inline]
fn as_fd(&self) -> BorrowedFd<'_> {
// SAFETY: user code should not close stdin out from under the standard library
unsafe { BorrowedFd::borrow_raw(0) }
}
}
impl io::Read for Stdin {
fn read(&mut self, data: &mut [u8]) -> io::Result<usize> {
self.read_vectored(&mut [IoSliceMut::new(data)])
}
fn read_vectored(&mut self, data: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
ManuallyDrop::new(unsafe { WasiFd::from_raw_fd(self.as_raw_fd()) }).read(data)
}
#[inline]
fn is_read_vectored(&self) -> bool {
true
}
}
impl Stdout {
pub const fn new() -> Stdout {
Stdout
}
}
impl AsRawFd for Stdout {
#[inline]
fn as_raw_fd(&self) -> raw::c_int {
1
}
}
impl AsFd for Stdout {
#[inline]
fn as_fd(&self) -> BorrowedFd<'_> {
unsafe { BorrowedFd::borrow_raw(1) }
}
}
#[stable(feature = "io_safety", since = "1.63.0")]
impl<'a> AsFd for io::StdoutLock<'a> {
#[inline]
fn as_fd(&self) -> BorrowedFd<'_> {
// SAFETY: user code should not close stdout out from under the standard library
unsafe { BorrowedFd::borrow_raw(1) }
}
}
impl io::Write for Stdout {
fn write(&mut self, data: &[u8]) -> io::Result<usize> {
self.write_vectored(&[IoSlice::new(data)])
}
fn write_vectored(&mut self, data: &[IoSlice<'_>]) -> io::Result<usize> {
ManuallyDrop::new(unsafe { WasiFd::from_raw_fd(self.as_raw_fd()) }).write(data)
}
#[inline]
fn is_write_vectored(&self) -> bool {
true
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
impl Stderr {
pub const fn new() -> Stderr {
Stderr
}
}
impl AsRawFd for Stderr {
#[inline]
fn as_raw_fd(&self) -> raw::c_int {
2
}
}
impl AsFd for Stderr {
#[inline]
fn as_fd(&self) -> BorrowedFd<'_> {
unsafe { BorrowedFd::borrow_raw(2) }
}
}
#[stable(feature = "io_safety", since = "1.63.0")]
impl<'a> AsFd for io::StderrLock<'a> {
#[inline]
fn as_fd(&self) -> BorrowedFd<'_> {
// SAFETY: user code should not close stderr out from under the standard library
unsafe { BorrowedFd::borrow_raw(2) }
}
}
impl io::Write for Stderr {
fn write(&mut self, data: &[u8]) -> io::Result<usize> {
self.write_vectored(&[IoSlice::new(data)])
}
fn write_vectored(&mut self, data: &[IoSlice<'_>]) -> io::Result<usize> {
ManuallyDrop::new(unsafe { WasiFd::from_raw_fd(self.as_raw_fd()) }).write(data)
}
#[inline]
fn is_write_vectored(&self) -> bool {
true
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
pub const STDIN_BUF_SIZE: usize = crate::sys_common::io::DEFAULT_BUF_SIZE;
pub fn is_ebadf(err: &io::Error) -> bool {
err.raw_os_error() == Some(wasi::ERRNO_BADF.raw().into())
}
pub fn panic_output() -> Option<impl io::Write> {
Some(Stderr::new())
}
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