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