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#![deny(unsafe_op_in_unsafe_fn)]
use crate::io;
use core::arch::asm;
pub struct Stdin;
pub struct Stdout;
pub struct Stderr;
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
}
fn print_buf(s: &[u8]) -> io::Result<usize> {
// Corresponds to `HM_DEBUG_PUT_BYTES_LIMIT`.
const MAX_LEN: usize = 512;
let len = if s.len() > MAX_LEN { MAX_LEN } else { s.len() };
let result = unsafe { debug_call(0, KCALL_DEBUG_CMD_PUT_BYTES, s.as_ptr() as u64, len as u64) };
if result == 0 { Ok(len) } else { Err(io::Error::from(io::ErrorKind::InvalidInput)) }
}
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> {
print_buf(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> {
print_buf(buf)
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
pub const STDIN_BUF_SIZE: usize = 0;
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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