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#![no_main]
#![feature(compiler_builtins_lib)]
#![no_std]
extern crate compiler_builtins;
mod io;
use io::vga_text;
use core::fmt::Write;
#[no_mangle]
pub extern "C" fn _start() -> ! {
let mut stdout = vga_text::OStream::new();
stdout.clear();
write!(&mut stdout, "hello world!");
panic!("i has panicing");
core::iter::successors(Some(0), |n| Some(n + 1))
.for_each(|n| write!(&mut stdout, "hello world {}!", n).unwrap());
loop {}
}
#[panic_handler]
#[no_mangle]
pub extern "C" fn panic_handler(_info: &core::panic::PanicInfo) -> ! {
let mut stderr = vga_text::OStream::new();
stderr.set_state(vga_text::CharState::from_colors(
vga_text::Color::LightRed,
vga_text::Color::Red,
));
stderr.clear();
stderr.print(b"uff-os");
stderr.set_row(10);
stderr.set_state(vga_text::CharState::from_colors(
vga_text::Color::White,
vga_text::Color::Red,
));
stderr.print_centered(b"<kernel panic>");
stderr.set_row(14);
let text = _info
.payload()
.downcast_ref::<&str>()
.unwrap_or(&"no panic information is obtainable");
stderr.set_state(vga_text::CharState::from_colors(
vga_text::Color::Cyan,
vga_text::Color::Red,
));
stderr.print_centered(text.as_bytes());
loop {}
}
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