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use core::fmt::Write;
use crate::io::vga_text::{OStream, CharState, Color};
const PANIC_SCREEN_MESSAGE_BUFFER_SIZE: usize = 2048;
struct TextBuffer<'a> {
dst: &'a mut [u8],
len: usize
}
impl<'a> TextBuffer<'a> {
fn new(dst: &'a mut [u8]) -> Self {
Self { dst, len: 0 }
}
fn get(&'a mut self) -> &'a mut [u8] {
&mut self.dst[..self.len]
}
}
impl<'a> core::fmt::Write for TextBuffer<'a> {
fn write_str(&mut self, s: &str) -> core::fmt::Result {
if s.len() + self.len > self.dst.len() {
Err(core::fmt::Error)
} else {
let s = s.as_bytes();
(&mut self.dst[self.len..self.len+s.len()]).clone_from_slice(s);
Ok(self.len += s.len())
}
}
}
pub fn show(args: Option<&core::fmt::Arguments>) {
let mut stderr = OStream::new();
stderr.set_state(CharState::from_colors(
Color::LightRed,
Color::Red,
));
stderr.clear();
stderr.print(b"uff-os");
stderr.set_row(10);
stderr.set_state(CharState::from_colors(
Color::White,
Color::Red,
));
stderr.print_centered(b"<kernel panic>");
stderr.set_row(14);
stderr.set_state(CharState::from_colors(
Color::Cyan,
Color::Red,
));
stderr.set_centered(true);
let buffer: &mut [u8] = &mut [b' '; PANIC_SCREEN_MESSAGE_BUFFER_SIZE];
let mut tbuffer = TextBuffer::new(buffer);
let _ = core::fmt::write(&mut tbuffer, *args.unwrap_or(&format_args!("no panic information obtainable")));
stderr.print(tbuffer.get());
stderr.set_centered(false);
}
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