From 81e412fa80ddce218120578b980f4a68f80d1ae1 Mon Sep 17 00:00:00 2001
From: Yu Chen <yuchen@mail.tsinghua.edu.cn>
Date: Mon, 4 Apr 2022 09:37:06 +0800
Subject: [PATCH] add usr/src/bin/cat_filea.rs to show text file: filea's
 contents

---
 user/src/bin/cat_filea.rs | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 user/src/bin/cat_filea.rs

diff --git a/user/src/bin/cat_filea.rs b/user/src/bin/cat_filea.rs
new file mode 100644
index 00000000..6307ecd5
--- /dev/null
+++ b/user/src/bin/cat_filea.rs
@@ -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
+}