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wasmer/lib/wasi-tests/wasitests/fseek.rs

48 lines
1.5 KiB
Rust

// Args:
// mapdir: .:wasitests/test_fs/hamlet
use std::fs;
use std::io::{Read, Seek, SeekFrom};
use std::path::PathBuf;
fn main() {
#[cfg(not(target_os = "wasi"))]
let mut base = PathBuf::from("wasitests/test_fs/hamlet");
#[cfg(target_os = "wasi")]
let mut base = PathBuf::from(".");
base.push("act1/scene3.txt");
let mut file = fs::File::open(&base).expect("Could not open file");
let mut buffer = [0u8; 32];
assert_eq!(file.read(&mut buffer).unwrap(), 32);
let str_val = std::str::from_utf8(&buffer[..]).unwrap();
println!("{}", str_val);
assert_eq!(file.read(&mut buffer).unwrap(), 32);
let str_val = std::str::from_utf8(&buffer[..]).unwrap();
println!("{}", str_val);
assert_eq!(file.seek(SeekFrom::Start(123)).unwrap(), 123);
assert_eq!(file.read(&mut buffer).unwrap(), 32);
let str_val = std::str::from_utf8(&buffer[..]).unwrap();
println!("{}", str_val);
assert_eq!(file.seek(SeekFrom::End(-123)).unwrap(), 6617);
assert_eq!(file.read(&mut buffer).unwrap(), 32);
let str_val = std::str::from_utf8(&buffer[..]).unwrap();
println!("{}", str_val);
assert_eq!(file.seek(SeekFrom::Current(-250)).unwrap(), 6399);
assert_eq!(file.read(&mut buffer).unwrap(), 32);
let str_val = std::str::from_utf8(&buffer[..]).unwrap();
println!("{}", str_val);
assert_eq!(file.seek(SeekFrom::Current(50)).unwrap(), 6481);
assert_eq!(file.read(&mut buffer).unwrap(), 32);
let str_val = std::str::from_utf8(&buffer[..]).unwrap();
println!("{}", str_val);
}