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#![deny(unsafe_op_in_unsafe_fn)]
#[expect(dead_code)]
#[path = "unsupported.rs"]
mod unsupported_stdio;
use core::arch::asm;
use crate::io;
pub type Stdin = unsupported_stdio::Stdin;
pub struct Stdout;
pub type Stderr = Stdout;
const KCALL_DEBUG_CMD_PUT_BYTES: i64 = 2;
unsafe fn debug_call(cap_ref: u64, call_no: i64, arg1: u64, arg2: u64) -> i32 {
let ret: u64;
unsafe {
asm!(
"svc #99",
inout("x0") cap_ref => ret,
in("x1") call_no,
in("x2") arg1,
in("x3") arg2,
);
}
ret as i32
}
impl Stdout {
pub const fn new() -> Stdout {
Stdout
}
}
impl io::Write for Stdout {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
// Corresponds to `HM_DEBUG_PUT_BYTES_LIMIT`.
const MAX_LEN: usize = 512;
let len = buf.len().min(MAX_LEN);
let result =
unsafe { debug_call(0, KCALL_DEBUG_CMD_PUT_BYTES, buf.as_ptr() as u64, len as u64) };
if result == 0 { Ok(len) } else { Err(io::Error::from(io::ErrorKind::InvalidInput)) }
}
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 {
err.raw_os_error() == Some(libc::EBADF as i32)
}
pub fn panic_output() -> Option<impl io::Write> {
Some(Stderr::new())
}
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