add usr/src/bin/cat_filea.rs to show text file: filea's contents

pull/70/head
Yu Chen 3 years ago
parent 0c2244d9c5
commit 81e412fa80

@ -0,0 +1,27 @@
#![no_std]
#![no_main]
#[macro_use]
extern crate user_lib;
extern crate alloc;
use user_lib::{close, open, read, OpenFlags};
#[no_mangle]
pub fn main() -> i32 {
let fd = open("filea\0", OpenFlags::RDONLY);
if fd == -1 {
panic!("Error occured when opening file");
}
let fd = fd as usize;
let mut buf = [0u8; 256];
loop {
let size = read(fd, &mut buf) as usize;
if size == 0 {
break;
}
println!("{}", core::str::from_utf8(&buf[..size]).unwrap());
}
close(fd);
0
}
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