#[link(wasm_import_module = "tex")]
unsafe extern "C" {
    fn tex_putchar(c: i32);
    fn tex_flush();
}

#[unsafe(no_mangle)]
pub extern "C" fn tex_hello(a: i32, b: i32) {
    tex_sprint(&format!("Hello \\LaTeX{{}} from Rust! ${a} + {b} = {}$", a+b));
}

fn tex_sprint(s: &str) {
    for c in s.chars() {
        unsafe { tex_putchar(c as i32) };
    }
    unsafe { tex_flush() };
}