34 lines
No EOL
675 B
Rust
34 lines
No EOL
675 B
Rust
#![no_std]
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#![no_main]
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#[macro_use]
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extern crate user_lib;
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extern crate alloc;
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use user_lib::{
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open,
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OpenFlags,
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close,
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read,
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};
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use alloc::string::String;
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#[no_mangle]
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pub fn main(argc: usize, argv: &[&str]) -> i32 {
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assert!(argc == 2);
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let fd = open(argv[1], OpenFlags::RDONLY);
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if fd == -1 {
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panic!("Error occured when opening file");
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}
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let fd = fd as usize;
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let mut buf = [0u8; 16];
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let mut s = String::new();
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loop {
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let size = read(fd, &mut buf) as usize;
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if size == 0 { break; }
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s.push_str(core::str::from_utf8(&buf[..size]).unwrap());
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}
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println!("{}", s);
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close(fd);
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0
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} |