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use crate::io::{self, IoSlice, IoSliceMut};
use crate::libc;
use crate::mem::ManuallyDrop;
use crate::sys::fd::WasiFd;
pub struct Stdin;
pub struct Stdout;
pub struct Stderr;
impl Stdin {
pub fn new() -> io::Result<Stdin> {
Ok(Stdin)
}
pub fn read(&self, data: &mut [u8]) -> io::Result<usize> {
self.read_vectored(&mut [IoSliceMut::new(data)])
}
pub fn read_vectored(&self, data: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
ManuallyDrop::new(unsafe { WasiFd::from_raw(libc::STDIN_FILENO as u32) })
.read(data)
}
}
impl Stdout {
pub fn new() -> io::Result<Stdout> {
Ok(Stdout)
}
pub fn write(&self, data: &[u8]) -> io::Result<usize> {
self.write_vectored(&[IoSlice::new(data)])
}
pub fn write_vectored(&self, data: &[IoSlice<'_>]) -> io::Result<usize> {
ManuallyDrop::new(unsafe { WasiFd::from_raw(libc::STDOUT_FILENO as u32) })
.write(data)
}
pub fn flush(&self) -> io::Result<()> {
Ok(())
}
}
impl Stderr {
pub fn new() -> io::Result<Stderr> {
Ok(Stderr)
}
pub fn write(&self, data: &[u8]) -> io::Result<usize> {
self.write_vectored(&[IoSlice::new(data)])
}
pub fn write_vectored(&self, data: &[IoSlice<'_>]) -> io::Result<usize> {
ManuallyDrop::new(unsafe { WasiFd::from_raw(libc::STDERR_FILENO as u32) })
.write(data)
}
pub fn flush(&self) -> io::Result<()> {
Ok(())
}
}
impl io::Write for Stderr {
fn write(&mut self, data: &[u8]) -> io::Result<usize> {
(&*self).write(data)
}
fn flush(&mut self) -> io::Result<()> {
(&*self).flush()
}
}
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(libc::__WASI_EBADF as i32)
}
pub fn panic_output() -> Option<impl io::Write> {
Stderr::new().ok()
}
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