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| use std::fmt;
use std::io::{self, Read, Write};
const MAX_MSG_LEN: usize = 0x50;
struct Msg {
data: [u8; MAX_MSG_LEN],
}
impl Msg {
#[inline(never)]
fn new() -> Self {
Msg {
data: [0; MAX_MSG_LEN],
}
}
}
impl fmt::Display for Msg {
#[inline(never)]
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{:?}", self.data)
}
}
#[inline(never)]
fn prompt(msg: String) {
print!("{} > ", msg);
io::stdout().flush().unwrap();
}
struct ChatBox {
msg_list: Vec<&'static mut Msg>,
}
impl ChatBox {
#[inline(never)]
fn new() -> Self {
ChatBox {
msg_list: Vec::new(),
}
}
#[inline(never)]
fn add_msg(&mut self) {
println!("Adding a new message");
self.msg_list.push(self.get_ptr());
println!(
"Successfully added a new message with index: {}",
self.msg_list.len() - 1
);
}
#[inline(never)]
fn show_msg(&mut self) {
prompt("Index".parse().unwrap());
let mut index = String::new();
io::stdin().read_line(&mut index).expect("Failed to read");
let index: usize = index.trim().parse().expect("Invalid!");
println!("Content: {}", self.msg_list[index]);
}
#[inline(never)]
fn edit_msg(&mut self) {
prompt("Index".parse().unwrap());
let mut index = String::new();
io::stdin().read_line(&mut index).expect("Failed to read");
let index: usize = index.trim().parse().expect("Invalid!");
prompt("Content".parse().unwrap());
let mut handle = io::stdin().lock();
handle.read(&mut self.msg_list[index].data).expect("Failed to read");
println!("Content: {}", self.msg_list[index]);
}
#[inline(never)]
fn delete_msg(&mut self) {
prompt("Index".parse().unwrap());
let mut index = String::new();
io::stdin().read_line(&mut index).expect("Failed to read");
let index: usize = index.trim().parse().expect("Invalid!");
self.msg_list.remove(index);
}
#[inline(never)]
fn get_ptr(&self) -> &'static mut Msg {
const S: &&() = &&();
fn get_ptr<'a, 'b, T: ?Sized>(x: &'a mut T) -> &'b mut T {
fn ident<'a, 'b, T: ?Sized>(_val_a: &'a &'b (), val_b: &'b mut T) -> &'a mut T {
val_b
}
let f: fn(_, &'a mut T) -> &'b mut T = ident;
f(S, x)
}
let mut msg = Msg::new();
get_ptr(&mut msg)
}
}
#[inline(never)]
fn main() {
let mut chat_box = ChatBox::new();
println!("I am a chatting bot of QWB S8, you can chat with me.");
println!("If you delight me, I will give you flag!");
println!("This is function menu: ");
println!("1. add");
println!("2. show");
println!("3. edit");
println!("4. delete");
println!("5. exit");
loop {
prompt("Choice".parse().unwrap());
let mut choice = String::new();
io::stdin().read_line(&mut choice).expect("Failed to read");
let choice: i8 = choice.trim().parse().expect("Invalid!");
match choice {
1 => chat_box.add_msg(),
2 => chat_box.show_msg(),
3 => chat_box.edit_msg(),
4 => chat_box.delete_msg(),
5 => break,
_ => println!("Invalid Choice!")
}
}
}
|
