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use crate::io;
pub struct Stdin;
pub struct Stdout;
pub struct Stderr;
impl Stdin {
pub const fn new() -> Stdin {
Stdin
}
}
impl io::Read for Stdin {
fn read(&mut self, _buf: &mut [u8]) -> io::Result<usize> {
Ok(0)
}
}
impl Stdout {
pub const fn new() -> Stdout {
Stdout
}
}
impl io::Write for Stdout {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
_write(libc::STDOUT_FILENO, 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(libc::STDERR_FILENO, buf)
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
pub const STDIN_BUF_SIZE: usize = 0;
pub fn is_ebadf(_err: &io::Error) -> bool {
true
}
pub fn panic_output() -> Option<impl io::Write> {
Some(Stderr)
}
fn _write(fd: i32, message: &[u8]) -> io::Result<usize> {
let mut iov =
libc::iovec { iov_base: message.as_ptr() as *mut _, iov_len: message.len() };
loop {
// SAFETY: syscall, safe arguments.
let ret = unsafe { libc::writev(fd, &iov, 1) };
if ret < 0 {
return Err(io::Error::last_os_error());
}
let ret = ret as usize;
if ret > iov.iov_len {
return Err(io::Error::last_os_error());
}
if ret == iov.iov_len {
return Ok(message.len());
}
// SAFETY: ret has been checked to be less than the length of
// the buffer
iov.iov_base = unsafe { iov.iov_base.add(ret) };
iov.iov_len -= ret;
}
}
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