#![no_std]
#![no_main]

#[macro_use]
extern crate user_lib;

use user_lib::{
    OpenFlags,
    open,
    close,
    write,
    get_time,
};

#[no_mangle]
pub fn main() -> i32 {
    let mut buffer = [0u8; 1024]; // 1KiB
    for i in 0..buffer.len() {
        buffer[i] = i as u8;
    }
    let f = open("testf", OpenFlags::CREATE | OpenFlags::WRONLY);
    if f < 0 {
        panic!("Open test file failed!");
    }
    let f = f as usize;
    let start = get_time();
    let size_mb = 5usize;
    for _ in 0..1024*size_mb {
        write(f, &buffer);
    }
    close(f);
    let time_ms = (get_time() - start) as usize;
    let speed_kbs = size_mb * 1000000 / time_ms;
    println!("time cost = {}ms, write speed = {}KiB/s", time_ms, speed_kbs);
    0
}