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#[expect(dead_code)]
#[path = "unsupported.rs"]
mod unsupported_stdio;
use crate::cmp;
use crate::io::{self, IoSlice};
pub type Stdin = unsupported_stdio::Stdin;
pub struct Stdout;
pub struct Stderr;
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 write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
write_vectored(libc::STDOUT_FILENO, bufs)
}
#[inline]
fn is_write_vectored(&self) -> bool {
true
}
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 write_vectored(&mut self, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
write_vectored(libc::STDERR_FILENO, bufs)
}
#[inline]
fn is_write_vectored(&self) -> bool {
true
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
pub const STDIN_BUF_SIZE: usize = unsupported_stdio::STDIN_BUF_SIZE;
pub fn is_ebadf(_err: &io::Error) -> bool {
true
}
pub fn panic_output() -> Option<impl io::Write> {
Some(Stderr)
}
fn write(fd: i32, buf: &[u8]) -> io::Result<usize> {
let iov = libc::iovec { iov_base: buf.as_ptr() as *mut _, iov_len: buf.len() };
// SAFETY: syscall, safe arguments.
let ret = unsafe { libc::writev(fd, &iov, 1) };
// This check includes ret < 0, since the length is at most isize::MAX.
if ret as usize > iov.iov_len {
return Err(io::Error::last_os_error());
}
Ok(ret as usize)
}
fn write_vectored(fd: i32, bufs: &[IoSlice<'_>]) -> io::Result<usize> {
let iov = bufs.as_ptr() as *const libc::iovec;
let len = cmp::min(bufs.len(), libc::c_int::MAX as usize) as libc::c_int;
// SAFETY: syscall, safe arguments.
let ret = unsafe { libc::writev(fd, iov, len) };
if ret < 0 {
return Err(io::Error::last_os_error());
}
Ok(ret as usize)
}
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