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#![unstable(issue = "none", feature = "windows_stdio")]
use crate::io;
use crate::mem::ManuallyDrop;
use crate::os::windows::io::FromRawHandle;
use crate::sys::c;
use crate::sys::handle::Handle;
pub struct Stdin {}
pub struct Stdout;
pub struct Stderr;
const MAX_BUFFER_SIZE: usize = 8192;
pub const STDIN_BUF_SIZE: usize = MAX_BUFFER_SIZE / 2 * 3;
pub fn get_handle(handle_id: c::DWORD) -> io::Result<c::HANDLE> {
let handle = unsafe { c::GetStdHandle(handle_id) };
if handle == c::INVALID_HANDLE_VALUE {
Err(io::Error::last_os_error())
} else if handle.is_null() {
Err(io::Error::from_raw_os_error(c::ERROR_INVALID_HANDLE as i32))
} else {
Ok(handle)
}
}
fn write(handle_id: c::DWORD, data: &[u8]) -> io::Result<usize> {
let handle = get_handle(handle_id)?;
// SAFETY: The handle returned from `get_handle` must be valid and non-null.
let handle = unsafe { Handle::from_raw_handle(handle) };
ManuallyDrop::new(handle).write(data)
}
impl Stdin {
pub const fn new() -> Stdin {
Stdin {}
}
}
impl io::Read for Stdin {
fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> {
let handle = get_handle(c::STD_INPUT_HANDLE)?;
// SAFETY: The handle returned from `get_handle` must be valid and non-null.
let handle = unsafe { Handle::from_raw_handle(handle) };
ManuallyDrop::new(handle).read(buf)
}
}
impl Stdout {
pub const fn new() -> Stdout {
Stdout
}
}
impl io::Write for Stdout {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
write(c::STD_OUTPUT_HANDLE, buf)
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
impl Stderr {
pub const fn new() -> Stderr {
Stderr
}
}
impl io::Write for Stderr {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
write(c::STD_ERROR_HANDLE, buf)
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
pub fn is_ebadf(err: &io::Error) -> bool {
err.raw_os_error() == Some(c::ERROR_INVALID_HANDLE as i32)
}
pub fn panic_output() -> Option<impl io::Write> {
Some(Stderr::new())
}
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