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use crate::io::vga_text::Color;
use core::fmt::Write;
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(&self) -> &[u8] {
&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>) -> core::fmt::Result {
use Color::*;
let mut vga = crate::vga_lock!();
vga.set_color_state(LightRed, Red);
vga.clear();
vga.put_const_byte_str(*b"uff-os");
vga.new_lines(10);
vga.set_color_state(White, Red);
vga.put_arguments(format_args!(
"{:^width$}",
"<kernel panic>",
width = vga.width()
));
vga.new_lines(2);
vga.set_color_state(Cyan, Red);
let buffer = &mut [0u8; PANIC_SCREEN_MESSAGE_BUFFER_SIZE];
let mut tbuffer = TextBuffer::new(buffer);
core::fmt::write(
&mut tbuffer,
*args.unwrap_or(&format_args!("no panic information obtainable")),
)?;
for line in tbuffer.get().chunks(vga.width()) {
vga.put_byte_str(line);
}
Ok(())
}
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