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#![warn(clippy::read_zero_byte_vec)]
#![allow(clippy::unused_io_amount)]
use std::fs::File;
use std::io;
use std::io::prelude::*;
extern crate futures;
use futures::io::{AsyncRead, AsyncReadExt};
use tokio::io::{AsyncRead as TokioAsyncRead, AsyncReadExt as _, AsyncWrite as TokioAsyncWrite, AsyncWriteExt as _};
fn test() -> io::Result<()> {
let cap = 1000;
let mut f = File::open("foo.txt").unwrap();
// should lint
let mut data = Vec::with_capacity(20);
f.read_exact(&mut data).unwrap();
// should lint
let mut data2 = Vec::with_capacity(cap);
f.read_exact(&mut data2)?;
// should lint
let mut data3 = Vec::new();
f.read_exact(&mut data3)?;
// should lint
let mut data4 = vec![];
let _ = f.read(&mut data4)?;
// should lint
let _ = {
let mut data5 = Vec::new();
f.read(&mut data5)
};
// should lint
let _ = {
let mut data6: Vec<u8> = Default::default();
f.read(&mut data6)
};
// should not lint
let mut buf = [0u8; 100];
f.read(&mut buf)?;
// should not lint
let mut empty = vec![];
let mut data7 = vec![];
f.read(&mut empty);
// should not lint
f.read(&mut data7);
// should not lint
let mut data8 = Vec::new();
data8.resize(100, 0);
f.read_exact(&mut data8)?;
// should not lint
let mut data9 = vec![1, 2, 3];
f.read_exact(&mut data9)?;
Ok(())
}
async fn test_futures<R: AsyncRead + Unpin>(r: &mut R) {
// should lint
let mut data = Vec::new();
r.read(&mut data).await.unwrap();
// should lint
let mut data2 = Vec::new();
r.read_exact(&mut data2).await.unwrap();
}
async fn test_tokio<R: TokioAsyncRead + Unpin>(r: &mut R) {
// should lint
let mut data = Vec::new();
r.read(&mut data).await.unwrap();
// should lint
let mut data2 = Vec::new();
r.read_exact(&mut data2).await.unwrap();
}
fn main() {}
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