<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `src/libstd/io/buffered.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>buffered.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../../normalize1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../rustdoc1.35.0.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../../dark1.35.0.css"><link rel="stylesheet" type="text/css" href="../../../light1.35.0.css" id="themeStyle"><script src="../../../storage1.35.0.js"></script><noscript><link rel="stylesheet" href="../../../noscript1.35.0.css"></noscript><link rel="shortcut icon" href="../../../favicon1.35.0.ico"><style type="text/css">#crate-search{background-image:url("../../../down-arrow1.35.0.svg");}</style></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../../std/index.html'><img src='../../../rust-logo1.35.0.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../../brush1.35.0.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../../theme1.35.0.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel1.35.0.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><div class="example-wrap"><pre class="rust ">
<span class="doccomment">//! Buffering wrappers for I/O traits</span>
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">cmp</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">error</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">Initializer</span>, <span class="ident">DEFAULT_BUF_SIZE</span>, <span class="ident">Error</span>, <span class="ident">ErrorKind</span>, <span class="ident">SeekFrom</span>, <span class="ident">IoVec</span>, <span class="ident">IoVecMut</span>};
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">memchr</span>;
<span class="doccomment">/// The `BufReader` struct adds buffering to any reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It can be excessively inefficient to work directly with a [`Read`] instance.</span>
<span class="doccomment">/// For example, every call to [`read`][`TcpStream::read`] on [`TcpStream`]</span>
<span class="doccomment">/// results in a system call. A `BufReader` performs large, infrequent reads on</span>
<span class="doccomment">/// the underlying [`Read`] and maintains an in-memory buffer of the results.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `BufReader` can improve the speed of programs that make *small* and</span>
<span class="doccomment">/// *repeated* read calls to the same file or network socket. It does not</span>
<span class="doccomment">/// help when reading very large amounts at once, or reading just one or a few</span>
<span class="doccomment">/// times. It also provides no advantage when reading from a source that is</span>
<span class="doccomment">/// already in memory, like a `Vec<u8>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When the `BufReader` is dropped, the contents of its buffer will be</span>
<span class="doccomment">/// discarded. Creating multiple instances of a `BufReader` on the same</span>
<span class="doccomment">/// stream can cause data loss.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Read`]: ../../std/io/trait.Read.html</span>
<span class="doccomment">/// [`TcpStream::read`]: ../../std/net/struct.TcpStream.html#method.read</span>
<span class="doccomment">/// [`TcpStream`]: ../../std/net/struct.TcpStream.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::io::BufReader;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let f = File::open("log.txt")?;</span>
<span class="doccomment">/// let mut reader = BufReader::new(f);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut line = String::new();</span>
<span class="doccomment">/// let len = reader.read_line(&mut line)?;</span>
<span class="doccomment">/// println!("First line is {} bytes long", len);</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">R</span>,
<span class="ident">buf</span>: <span class="ident">Box</span><span class="op"><</span>[<span class="ident">u8</span>]<span class="op">></span>,
<span class="ident">pos</span>: <span class="ident">usize</span>,
<span class="ident">cap</span>: <span class="ident">usize</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="doccomment">/// Creates a new `BufReader` with a default buffer capacity. The default is currently 8 KB,</span>
<span class="doccomment">/// but may change in the future.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufReader;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let f = File::open("log.txt")?;</span>
<span class="doccomment">/// let reader = BufReader::new(f);</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">inner</span>: <span class="ident">R</span>) <span class="op">-></span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="ident">DEFAULT_BUF_SIZE</span>, <span class="ident">inner</span>)
}
<span class="doccomment">/// Creates a new `BufReader` with the specified buffer capacity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Creating a buffer with ten bytes of capacity:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufReader;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let f = File::open("log.txt")?;</span>
<span class="doccomment">/// let reader = BufReader::with_capacity(10, f);</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_capacity</span>(<span class="ident">cap</span>: <span class="ident">usize</span>, <span class="ident">inner</span>: <span class="ident">R</span>) <span class="op">-></span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">cap</span>);
<span class="ident">buffer</span>.<span class="ident">set_len</span>(<span class="ident">cap</span>);
<span class="ident">inner</span>.<span class="ident">initializer</span>().<span class="ident">initialize</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buffer</span>);
<span class="ident">BufReader</span> {
<span class="ident">inner</span>,
<span class="ident">buf</span>: <span class="ident">buffer</span>.<span class="ident">into_boxed_slice</span>(),
<span class="ident">pos</span>: <span class="number">0</span>,
<span class="ident">cap</span>: <span class="number">0</span>,
}
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="doccomment">/// Gets a reference to the underlying reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is inadvisable to directly read from the underlying reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufReader;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let f1 = File::open("log.txt")?;</span>
<span class="doccomment">/// let reader = BufReader::new(f1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let f2 = reader.get_ref();</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">R</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span> }
<span class="doccomment">/// Gets a mutable reference to the underlying reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is inadvisable to directly read from the underlying reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufReader;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let f1 = File::open("log.txt")?;</span>
<span class="doccomment">/// let mut reader = BufReader::new(f1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let f2 = reader.get_mut();</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</span> { <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">inner</span> }
<span class="doccomment">/// Returns a reference to the internally buffered data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Unlike `fill_buf`, this will not attempt to fill the buffer if it is empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// # #![feature(bufreader_buffer)]</span>
<span class="doccomment">/// use std::io::{BufReader, BufRead};</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let f = File::open("log.txt")?;</span>
<span class="doccomment">/// let mut reader = BufReader::new(f);</span>
<span class="doccomment">/// assert!(reader.buffer().is_empty());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// if reader.fill_buf()?.len() > 0 {</span>
<span class="doccomment">/// assert!(!reader.buffer().is_empty());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"bufreader_buffer"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"45323"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">buffer</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">buf</span>[<span class="self">self</span>.<span class="ident">pos</span>..<span class="self">self</span>.<span class="ident">cap</span>]
}
<span class="doccomment">/// Unwraps this `BufReader`, returning the underlying reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that any leftover data in the internal buffer is lost.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufReader;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let f1 = File::open("log.txt")?;</span>
<span class="doccomment">/// let reader = BufReader::new(f1);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let f2 = reader.into_inner();</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">R</span> { <span class="self">self</span>.<span class="ident">inner</span> }
<span class="doccomment">/// Invalidates all data in the internal buffer.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">discard_buffer</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="number">0</span>;
<span class="self">self</span>.<span class="ident">cap</span> <span class="op">=</span> <span class="number">0</span>;
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Seek</span><span class="op">></span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="doccomment">/// Seeks relative to the current position. If the new position lies within the buffer,</span>
<span class="doccomment">/// the buffer will not be flushed, allowing for more efficient seeks.</span>
<span class="doccomment">/// This method does not return the location of the underlying reader, so the caller</span>
<span class="doccomment">/// must track this information themselves if it is required.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"bufreader_seek_relative"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"31100"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">seek_relative</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">offset</span>: <span class="ident">i64</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="ident">pos</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">u64</span>;
<span class="kw">if</span> <span class="ident">offset</span> <span class="op"><</span> <span class="number">0</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">new_pos</span>) <span class="op">=</span> <span class="ident">pos</span>.<span class="ident">checked_sub</span>((<span class="op">-</span><span class="ident">offset</span>) <span class="kw">as</span> <span class="ident">u64</span>) {
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="ident">new_pos</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">return</span> <span class="prelude-val">Ok</span>(())
}
} <span class="kw">else</span> {
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">new_pos</span>) <span class="op">=</span> <span class="ident">pos</span>.<span class="ident">checked_add</span>(<span class="ident">offset</span> <span class="kw">as</span> <span class="ident">u64</span>) {
<span class="kw">if</span> <span class="ident">new_pos</span> <span class="op"><=</span> <span class="self">self</span>.<span class="ident">cap</span> <span class="kw">as</span> <span class="ident">u64</span> {
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="ident">new_pos</span> <span class="kw">as</span> <span class="ident">usize</span>;
<span class="kw">return</span> <span class="prelude-val">Ok</span>(())
}
}
}
<span class="self">self</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="ident">offset</span>)).<span class="ident">map</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="comment">// If we don't have any buffered data and we're doing a massive read</span>
<span class="comment">// (larger than our internal buffer), bypass our internal buffer</span>
<span class="comment">// entirely.</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">cap</span> <span class="op">&&</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">len</span>() {
<span class="self">self</span>.<span class="ident">discard_buffer</span>();
<span class="kw">return</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">read</span>(<span class="ident">buf</span>);
}
<span class="kw">let</span> <span class="ident">nread</span> <span class="op">=</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rem</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">fill_buf</span>()<span class="question-mark">?</span>;
<span class="ident">rem</span>.<span class="ident">read</span>(<span class="ident">buf</span>)<span class="question-mark">?</span>
};
<span class="self">self</span>.<span class="ident">consume</span>(<span class="ident">nread</span>);
<span class="prelude-val">Ok</span>(<span class="ident">nread</span>)
}
<span class="kw">fn</span> <span class="ident">read_vectored</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bufs</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">IoVecMut</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">total_len</span> <span class="op">=</span> <span class="ident">bufs</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span>.<span class="ident">len</span>()).<span class="ident">sum</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>();
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">cap</span> <span class="op">&&</span> <span class="ident">total_len</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">len</span>() {
<span class="self">self</span>.<span class="ident">discard_buffer</span>();
<span class="kw">return</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">read_vectored</span>(<span class="ident">bufs</span>);
}
<span class="kw">let</span> <span class="ident">nread</span> <span class="op">=</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">rem</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">fill_buf</span>()<span class="question-mark">?</span>;
<span class="ident">rem</span>.<span class="ident">read_vectored</span>(<span class="ident">bufs</span>)<span class="question-mark">?</span>
};
<span class="self">self</span>.<span class="ident">consume</span>(<span class="ident">nread</span>);
<span class="prelude-val">Ok</span>(<span class="ident">nread</span>)
}
<span class="comment">// we can't skip unconditionally because of the large buffer case in read.</span>
<span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">initializer</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Initializer</span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">initializer</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">BufRead</span> <span class="kw">for</span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fill_buf</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">u8</span>]<span class="op">></span> {
<span class="comment">// If we've reached the end of our internal buffer then we need to fetch</span>
<span class="comment">// some more data from the underlying reader.</span>
<span class="comment">// Branch using `>=` instead of the more correct `==`</span>
<span class="comment">// to tell the compiler that the pos..cap slice is always valid.</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">cap</span> {
<span class="macro">debug_assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">pos</span> <span class="op">==</span> <span class="self">self</span>.<span class="ident">cap</span>);
<span class="self">self</span>.<span class="ident">cap</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">buf</span>)<span class="question-mark">?</span>;
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="number">0</span>;
}
<span class="prelude-val">Ok</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">buf</span>[<span class="self">self</span>.<span class="ident">pos</span>..<span class="self">self</span>.<span class="ident">cap</span>])
}
<span class="kw">fn</span> <span class="ident">consume</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">amt</span>: <span class="ident">usize</span>) {
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="self">self</span>.<span class="ident">pos</span> <span class="op">+</span> <span class="ident">amt</span>, <span class="self">self</span>.<span class="ident">cap</span>);
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> <span class="kw">where</span> <span class="ident">R</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">fmt</span>.<span class="ident">debug_struct</span>(<span class="string">"BufReader"</span>)
.<span class="ident">field</span>(<span class="string">"reader"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>)
.<span class="ident">field</span>(<span class="string">"buffer"</span>, <span class="kw-2">&</span><span class="macro">format_args</span><span class="macro">!</span>(<span class="string">"{}/{}"</span>, <span class="self">self</span>.<span class="ident">cap</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">pos</span>, <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">len</span>()))
.<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Seek</span><span class="op">></span> <span class="ident">Seek</span> <span class="kw">for</span> <span class="ident">BufReader</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="doccomment">/// Seek to an offset, in bytes, in the underlying reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The position used for seeking with `SeekFrom::Current(_)` is the</span>
<span class="doccomment">/// position the underlying reader would be at if the `BufReader` had no</span>
<span class="doccomment">/// internal buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Seeking always discards the internal buffer, even if the seek position</span>
<span class="doccomment">/// would otherwise fall within it. This guarantees that calling</span>
<span class="doccomment">/// `.into_inner()` immediately after a seek yields the underlying reader</span>
<span class="doccomment">/// at the same position.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// To seek without discarding the internal buffer, use [`BufReader::seek_relative`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See [`std::io::Seek`] for more details.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note: In the edge case where you're seeking with `SeekFrom::Current(n)`</span>
<span class="doccomment">/// where `n` minus the internal buffer length overflows an `i64`, two</span>
<span class="doccomment">/// seeks will be performed instead of one. If the second seek returns</span>
<span class="doccomment">/// `Err`, the underlying reader will be left at the same position it would</span>
<span class="doccomment">/// have if you called `seek` with `SeekFrom::Current(0)`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`BufReader::seek_relative`]: struct.BufReader.html#method.seek_relative</span>
<span class="doccomment">/// [`std::io::Seek`]: trait.Seek.html</span>
<span class="kw">fn</span> <span class="ident">seek</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pos</span>: <span class="ident">SeekFrom</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">result</span>: <span class="ident">u64</span>;
<span class="kw">if</span> <span class="kw">let</span> <span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="ident">n</span>) <span class="op">=</span> <span class="ident">pos</span> {
<span class="kw">let</span> <span class="ident">remainder</span> <span class="op">=</span> (<span class="self">self</span>.<span class="ident">cap</span> <span class="op">-</span> <span class="self">self</span>.<span class="ident">pos</span>) <span class="kw">as</span> <span class="ident">i64</span>;
<span class="comment">// it should be safe to assume that remainder fits within an i64 as the alternative</span>
<span class="comment">// means we managed to allocate 8 exbibytes and that's absurd.</span>
<span class="comment">// But it's not out of the realm of possibility for some weird underlying reader to</span>
<span class="comment">// support seeking by i64::min_value() so we need to handle underflow when subtracting</span>
<span class="comment">// remainder.</span>
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">offset</span>) <span class="op">=</span> <span class="ident">n</span>.<span class="ident">checked_sub</span>(<span class="ident">remainder</span>) {
<span class="ident">result</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="ident">offset</span>))<span class="question-mark">?</span>;
} <span class="kw">else</span> {
<span class="comment">// seek backwards by our remainder, and then by the offset</span>
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="op">-</span><span class="ident">remainder</span>))<span class="question-mark">?</span>;
<span class="self">self</span>.<span class="ident">discard_buffer</span>();
<span class="ident">result</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="ident">n</span>))<span class="question-mark">?</span>;
}
} <span class="kw">else</span> {
<span class="comment">// Seeking with Start/End doesn't care about our buffer length.</span>
<span class="ident">result</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">seek</span>(<span class="ident">pos</span>)<span class="question-mark">?</span>;
}
<span class="self">self</span>.<span class="ident">discard_buffer</span>();
<span class="prelude-val">Ok</span>(<span class="ident">result</span>)
}
}
<span class="doccomment">/// Wraps a writer and buffers its output.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It can be excessively inefficient to work directly with something that</span>
<span class="doccomment">/// implements [`Write`]. For example, every call to</span>
<span class="doccomment">/// [`write`][`TcpStream::write`] on [`TcpStream`] results in a system call. A</span>
<span class="doccomment">/// `BufWriter` keeps an in-memory buffer of data and writes it to an underlying</span>
<span class="doccomment">/// writer in large, infrequent batches.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `BufWriter` can improve the speed of programs that make *small* and</span>
<span class="doccomment">/// *repeated* write calls to the same file or network socket. It does not</span>
<span class="doccomment">/// help when writing very large amounts at once, or writing just one or a few</span>
<span class="doccomment">/// times. It also provides no advantage when writing to a destination that is</span>
<span class="doccomment">/// in memory, like a `Vec<u8>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// When the `BufWriter` is dropped, the contents of its buffer will be written</span>
<span class="doccomment">/// out. However, any errors that happen in the process of flushing the buffer</span>
<span class="doccomment">/// when the writer is dropped will be ignored. Code that wishes to handle such</span>
<span class="doccomment">/// errors must manually call [`flush`] before the writer is dropped.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Let's write the numbers one through ten to a [`TcpStream`]:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut stream = TcpStream::connect("127.0.0.1:34254").unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for i in 0..10 {</span>
<span class="doccomment">/// stream.write(&[i+1]).unwrap();</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Because we're not buffering, we write each one in turn, incurring the</span>
<span class="doccomment">/// overhead of a system call per byte written. We can fix this with a</span>
<span class="doccomment">/// `BufWriter`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut stream = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for i in 0..10 {</span>
<span class="doccomment">/// stream.write(&[i+1]).unwrap();</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// By wrapping the stream with a `BufWriter`, these ten writes are all grouped</span>
<span class="doccomment">/// together by the buffer, and will all be written out in one system call when</span>
<span class="doccomment">/// the `stream` is dropped.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Write`]: ../../std/io/trait.Write.html</span>
<span class="doccomment">/// [`TcpStream::write`]: ../../std/net/struct.TcpStream.html#method.write</span>
<span class="doccomment">/// [`TcpStream`]: ../../std/net/struct.TcpStream.html</span>
<span class="doccomment">/// [`flush`]: #method.flush</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">W</span><span class="op">></span>,
<span class="ident">buf</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>,
<span class="comment">// #30888: If the inner writer panics in a call to write, we don't want to</span>
<span class="comment">// write the buffered data a second time in BufWriter's destructor. This</span>
<span class="comment">// flag tells the Drop impl if it should skip the flush.</span>
<span class="ident">panicked</span>: <span class="ident">bool</span>,
}
<span class="doccomment">/// An error returned by `into_inner` which combines an error that</span>
<span class="doccomment">/// happened while writing out the buffer, and the buffered writer object</span>
<span class="doccomment">/// which may be used to recover from the condition.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut stream = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // do stuff with the stream</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // we want to get our `TcpStream` back, so let's try:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let stream = match stream.into_inner() {</span>
<span class="doccomment">/// Ok(s) => s,</span>
<span class="doccomment">/// Err(e) => {</span>
<span class="doccomment">/// // Here, e is an IntoInnerError</span>
<span class="doccomment">/// panic!("An error occurred");</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// };</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">IntoInnerError</span><span class="op"><</span><span class="ident">W</span><span class="op">></span>(<span class="ident">W</span>, <span class="ident">Error</span>);
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span><span class="op">></span> <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="doccomment">/// Creates a new `BufWriter` with a default buffer capacity. The default is currently 8 KB,</span>
<span class="doccomment">/// but may change in the future.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buffer = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">inner</span>: <span class="ident">W</span>) <span class="op">-></span> <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="ident">BufWriter</span>::<span class="ident">with_capacity</span>(<span class="ident">DEFAULT_BUF_SIZE</span>, <span class="ident">inner</span>)
}
<span class="doccomment">/// Creates a new `BufWriter` with the specified buffer capacity.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Creating a buffer with a buffer of a hundred bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let stream = TcpStream::connect("127.0.0.1:34254").unwrap();</span>
<span class="doccomment">/// let mut buffer = BufWriter::with_capacity(100, stream);</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_capacity</span>(<span class="ident">cap</span>: <span class="ident">usize</span>, <span class="ident">inner</span>: <span class="ident">W</span>) <span class="op">-></span> <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="ident">BufWriter</span> {
<span class="ident">inner</span>: <span class="prelude-val">Some</span>(<span class="ident">inner</span>),
<span class="ident">buf</span>: <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="ident">cap</span>),
<span class="ident">panicked</span>: <span class="bool-val">false</span>,
}
}
<span class="kw">fn</span> <span class="ident">flush_buf</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">written</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">len</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">ret</span> <span class="op">=</span> <span class="prelude-val">Ok</span>(());
<span class="kw">while</span> <span class="ident">written</span> <span class="op"><</span> <span class="ident">len</span> {
<span class="self">self</span>.<span class="ident">panicked</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_mut</span>().<span class="ident">unwrap</span>().<span class="ident">write</span>(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">buf</span>[<span class="ident">written</span>..]);
<span class="self">self</span>.<span class="ident">panicked</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="kw">match</span> <span class="ident">r</span> {
<span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> {
<span class="ident">ret</span> <span class="op">=</span> <span class="prelude-val">Err</span>(<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">ErrorKind</span>::<span class="ident">WriteZero</span>,
<span class="string">"failed to write the buffered data"</span>));
<span class="kw">break</span>;
}
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=></span> <span class="ident">written</span> <span class="op">+=</span> <span class="ident">n</span>,
<span class="prelude-val">Err</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="kw">if</span> <span class="ident">e</span>.<span class="ident">kind</span>() <span class="op">==</span> <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Interrupted</span> <span class="op">=></span> {}
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> { <span class="ident">ret</span> <span class="op">=</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>); <span class="kw">break</span> }
}
}
<span class="kw">if</span> <span class="ident">written</span> <span class="op">></span> <span class="number">0</span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">drain</span>(..<span class="ident">written</span>);
}
<span class="ident">ret</span>
}
<span class="doccomment">/// Gets a reference to the underlying writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buffer = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // we can use reference just like buffer</span>
<span class="doccomment">/// let reference = buffer.get_ref();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">W</span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap</span>() }
<span class="doccomment">/// Gets a mutable reference to the underlying writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is inadvisable to directly write to the underlying writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buffer = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // we can use reference just like buffer</span>
<span class="doccomment">/// let reference = buffer.get_mut();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">W</span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_mut</span>().<span class="ident">unwrap</span>() }
<span class="doccomment">/// Returns a reference to the internally buffered data.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// # #![feature(bufreader_buffer)]</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let buf_writer = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // See how many bytes are currently buffered</span>
<span class="doccomment">/// let bytes_buffered = buf_writer.buffer().len();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"bufreader_buffer"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"45323"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">buffer</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span>[<span class="ident">u8</span>] {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">buf</span>
}
<span class="doccomment">/// Unwraps this `BufWriter`, returning the underlying writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The buffer is written out before returning the writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An `Err` will be returned if an error occurs while flushing the buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buffer = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // unwrap the TcpStream and flush the buffer</span>
<span class="doccomment">/// let stream = buffer.into_inner().unwrap();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">W</span>, <span class="ident">IntoInnerError</span><span class="op"><</span><span class="ident">BufWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">>></span><span class="op">></span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">flush_buf</span>() {
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">IntoInnerError</span>(<span class="self">self</span>, <span class="ident">e</span>)),
<span class="prelude-val">Ok</span>(()) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">take</span>().<span class="ident">unwrap</span>())
}
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">></span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">capacity</span>() {
<span class="self">self</span>.<span class="ident">flush_buf</span>()<span class="question-mark">?</span>;
}
<span class="kw">if</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">>=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">capacity</span>() {
<span class="self">self</span>.<span class="ident">panicked</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_mut</span>().<span class="ident">unwrap</span>().<span class="ident">write</span>(<span class="ident">buf</span>);
<span class="self">self</span>.<span class="ident">panicked</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="ident">r</span>
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write</span>(<span class="ident">buf</span>)
}
}
<span class="kw">fn</span> <span class="ident">write_vectored</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">bufs</span>: <span class="kw-2">&</span>[<span class="ident">IoVec</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">total_len</span> <span class="op">=</span> <span class="ident">bufs</span>.<span class="ident">iter</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">b</span>.<span class="ident">len</span>()).<span class="ident">sum</span>::<span class="op"><</span><span class="ident">usize</span><span class="op">></span>();
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">+</span> <span class="ident">total_len</span> <span class="op">></span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">capacity</span>() {
<span class="self">self</span>.<span class="ident">flush_buf</span>()<span class="question-mark">?</span>;
}
<span class="kw">if</span> <span class="ident">total_len</span> <span class="op">>=</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">capacity</span>() {
<span class="self">self</span>.<span class="ident">panicked</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">let</span> <span class="ident">r</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_mut</span>().<span class="ident">unwrap</span>().<span class="ident">write_vectored</span>(<span class="ident">bufs</span>);
<span class="self">self</span>.<span class="ident">panicked</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="ident">r</span>
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">write_vectored</span>(<span class="ident">bufs</span>)
}
}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">flush_buf</span>().<span class="ident">and_then</span>(<span class="op">|</span>()<span class="op">|</span> <span class="self">self</span>.<span class="ident">get_mut</span>().<span class="ident">flush</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> <span class="kw">where</span> <span class="ident">W</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">fmt</span>.<span class="ident">debug_struct</span>(<span class="string">"BufWriter"</span>)
.<span class="ident">field</span>(<span class="string">"writer"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">as_ref</span>().<span class="ident">unwrap</span>())
.<span class="ident">field</span>(<span class="string">"buffer"</span>, <span class="kw-2">&</span><span class="macro">format_args</span><span class="macro">!</span>(<span class="string">"{}/{}"</span>, <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">len</span>(), <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">capacity</span>()))
.<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span> <span class="op">+</span> <span class="ident">Seek</span><span class="op">></span> <span class="ident">Seek</span> <span class="kw">for</span> <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="doccomment">/// Seek to the offset, in bytes, in the underlying writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Seeking always writes out the internal buffer before seeking.</span>
<span class="kw">fn</span> <span class="ident">seek</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pos</span>: <span class="ident">SeekFrom</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">flush_buf</span>().<span class="ident">and_then</span>(<span class="op">|</span><span class="kw">_</span><span class="op">|</span> <span class="self">self</span>.<span class="ident">get_mut</span>().<span class="ident">seek</span>(<span class="ident">pos</span>))
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">drop</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">is_some</span>() <span class="op">&&</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">panicked</span> {
<span class="comment">// dtors should not panic, so we ignore a failed flush</span>
<span class="kw">let</span> <span class="ident">_r</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">flush_buf</span>();
}
}
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> <span class="ident">IntoInnerError</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="doccomment">/// Returns the error which caused the call to `into_inner()` to fail.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This error was returned when attempting to write the internal buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut stream = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // do stuff with the stream</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // we want to get our `TcpStream` back, so let's try:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let stream = match stream.into_inner() {</span>
<span class="doccomment">/// Ok(s) => s,</span>
<span class="doccomment">/// Err(e) => {</span>
<span class="doccomment">/// // Here, e is an IntoInnerError, let's log the inner error.</span>
<span class="doccomment">/// //</span>
<span class="doccomment">/// // We'll just 'log' to stdout for this example.</span>
<span class="doccomment">/// println!("{}", e.error());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// panic!("An unexpected error occurred.");</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// };</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">error</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Error</span> { <span class="kw-2">&</span><span class="self">self</span>.<span class="number">1</span> }
<span class="doccomment">/// Returns the buffered writer instance which generated the error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned object can be used for error recovery, such as</span>
<span class="doccomment">/// re-inspecting the buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::net::TcpStream;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut stream = BufWriter::new(TcpStream::connect("127.0.0.1:34254").unwrap());</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // do stuff with the stream</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // we want to get our `TcpStream` back, so let's try:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let stream = match stream.into_inner() {</span>
<span class="doccomment">/// Ok(s) => s,</span>
<span class="doccomment">/// Err(e) => {</span>
<span class="doccomment">/// // Here, e is an IntoInnerError, let's re-examine the buffer:</span>
<span class="doccomment">/// let buffer = e.into_inner();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // do stuff to try to recover</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // afterwards, let's just return the stream</span>
<span class="doccomment">/// buffer.into_inner().unwrap()</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// };</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">W</span> { <span class="self">self</span>.<span class="number">0</span> }
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> <span class="ident">From</span><span class="op"><</span><span class="ident">IntoInnerError</span><span class="op"><</span><span class="ident">W</span><span class="op">>></span> <span class="kw">for</span> <span class="ident">Error</span> {
<span class="kw">fn</span> <span class="ident">from</span>(<span class="ident">iie</span>: <span class="ident">IntoInnerError</span><span class="op"><</span><span class="ident">W</span><span class="op">></span>) <span class="op">-></span> <span class="ident">Error</span> { <span class="ident">iie</span>.<span class="number">1</span> }
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Send</span> <span class="op">+</span> <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">IntoInnerError</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="ident">error</span>::<span class="ident">Error</span>::<span class="ident">description</span>(<span class="self">self</span>.<span class="ident">error</span>())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">IntoInnerError</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="self">self</span>.<span class="ident">error</span>().<span class="ident">fmt</span>(<span class="ident">f</span>)
}
}
<span class="doccomment">/// Wraps a writer and buffers output to it, flushing whenever a newline</span>
<span class="doccomment">/// (`0x0a`, `'\n'`) is detected.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The [`BufWriter`][bufwriter] struct wraps a writer and buffers its output.</span>
<span class="doccomment">/// But it only does this batched write when it goes out of scope, or when the</span>
<span class="doccomment">/// internal buffer is full. Sometimes, you'd prefer to write each line as it's</span>
<span class="doccomment">/// completed, rather than the entire buffer at once. Enter `LineWriter`. It</span>
<span class="doccomment">/// does exactly that.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Like [`BufWriter`], a `LineWriter`’s buffer will also be flushed when the</span>
<span class="doccomment">/// `LineWriter` goes out of scope or when its internal buffer is full.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [bufwriter]: struct.BufWriter.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If there's still a partial line in the buffer when the `LineWriter` is</span>
<span class="doccomment">/// dropped, it will flush those contents.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// We can use `LineWriter` to write one line at a time, significantly</span>
<span class="doccomment">/// reducing the number of actual writes to the file.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::fs::{self, File};</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::io::LineWriter;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let road_not_taken = b"I shall be telling this with a sigh</span>
<span class="doccomment">/// Somewhere ages and ages hence:</span>
<span class="doccomment">/// Two roads diverged in a wood, and I -</span>
<span class="doccomment">/// I took the one less traveled by,</span>
<span class="doccomment">/// And that has made all the difference.";</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let file = File::create("poem.txt")?;</span>
<span class="doccomment">/// let mut file = LineWriter::new(file);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// file.write_all(b"I shall be telling this with a sigh")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // No bytes are written until a newline is encountered (or</span>
<span class="doccomment">/// // the internal buffer is filled).</span>
<span class="doccomment">/// assert_eq!(fs::read_to_string("poem.txt")?, "");</span>
<span class="doccomment">/// file.write_all(b"\n")?;</span>
<span class="doccomment">/// assert_eq!(</span>
<span class="doccomment">/// fs::read_to_string("poem.txt")?,</span>
<span class="doccomment">/// "I shall be telling this with a sigh\n",</span>
<span class="doccomment">/// );</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Write the rest of the poem.</span>
<span class="doccomment">/// file.write_all(b"Somewhere ages and ages hence:</span>
<span class="doccomment">/// Two roads diverged in a wood, and I -</span>
<span class="doccomment">/// I took the one less traveled by,</span>
<span class="doccomment">/// And that has made all the difference.")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // The last line of the poem doesn't end in a newline, so</span>
<span class="doccomment">/// // we have to flush or drop the `LineWriter` to finish</span>
<span class="doccomment">/// // writing.</span>
<span class="doccomment">/// file.flush()?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Confirm the whole poem was written.</span>
<span class="doccomment">/// assert_eq!(fs::read("poem.txt")?, &road_not_taken[..]);</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">LineWriter</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">BufWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span>,
<span class="ident">need_flush</span>: <span class="ident">bool</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span><span class="op">></span> <span class="ident">LineWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="doccomment">/// Creates a new `LineWriter`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">/// use std::io::LineWriter;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let file = File::create("poem.txt")?;</span>
<span class="doccomment">/// let file = LineWriter::new(file);</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>(<span class="ident">inner</span>: <span class="ident">W</span>) <span class="op">-></span> <span class="ident">LineWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="comment">// Lines typically aren't that long, don't use a giant buffer</span>
<span class="ident">LineWriter</span>::<span class="ident">with_capacity</span>(<span class="number">1024</span>, <span class="ident">inner</span>)
}
<span class="doccomment">/// Creates a new `LineWriter` with a specified capacity for the internal</span>
<span class="doccomment">/// buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">/// use std::io::LineWriter;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let file = File::create("poem.txt")?;</span>
<span class="doccomment">/// let file = LineWriter::with_capacity(100, file);</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">with_capacity</span>(<span class="ident">cap</span>: <span class="ident">usize</span>, <span class="ident">inner</span>: <span class="ident">W</span>) <span class="op">-></span> <span class="ident">LineWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="ident">LineWriter</span> {
<span class="ident">inner</span>: <span class="ident">BufWriter</span>::<span class="ident">with_capacity</span>(<span class="ident">cap</span>, <span class="ident">inner</span>),
<span class="ident">need_flush</span>: <span class="bool-val">false</span>,
}
}
<span class="doccomment">/// Gets a reference to the underlying writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">/// use std::io::LineWriter;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let file = File::create("poem.txt")?;</span>
<span class="doccomment">/// let file = LineWriter::new(file);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let reference = file.get_ref();</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_ref</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">W</span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">get_ref</span>() }
<span class="doccomment">/// Gets a mutable reference to the underlying writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Caution must be taken when calling methods on the mutable reference</span>
<span class="doccomment">/// returned as extra writes could corrupt the output stream.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">/// use std::io::LineWriter;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let file = File::create("poem.txt")?;</span>
<span class="doccomment">/// let mut file = LineWriter::new(file);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // we can use reference just like file</span>
<span class="doccomment">/// let reference = file.get_mut();</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">get_mut</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">W</span> { <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">get_mut</span>() }
<span class="doccomment">/// Unwraps this `LineWriter`, returning the underlying writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The internal buffer is written out before returning the writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An `Err` will be returned if an error occurs while flushing the buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```no_run</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">/// use std::io::LineWriter;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn main() -> std::io::Result<()> {</span>
<span class="doccomment">/// let file = File::create("poem.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let writer: LineWriter<File> = LineWriter::new(file);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let file: File = writer.into_inner()?;</span>
<span class="doccomment">/// Ok(())</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">into_inner</span>(<span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">W</span>, <span class="ident">IntoInnerError</span><span class="op"><</span><span class="ident">LineWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">>></span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">into_inner</span>().<span class="ident">map_err</span>(<span class="op">|</span><span class="ident">IntoInnerError</span>(<span class="ident">buf</span>, <span class="ident">e</span>)<span class="op">|</span> {
<span class="ident">IntoInnerError</span>(<span class="ident">LineWriter</span> {
<span class="ident">inner</span>: <span class="ident">buf</span>,
<span class="ident">need_flush</span>: <span class="bool-val">false</span>,
}, <span class="ident">e</span>)
})
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span><span class="op">></span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">LineWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">need_flush</span> {
<span class="self">self</span>.<span class="ident">flush</span>()<span class="question-mark">?</span>;
}
<span class="comment">// Find the last newline character in the buffer provided. If found then</span>
<span class="comment">// we're going to write all the data up to that point and then flush,</span>
<span class="comment">// otherwise we just write the whole block to the underlying writer.</span>
<span class="kw">let</span> <span class="ident">i</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">memchr</span>::<span class="ident">memrchr</span>(<span class="string">b'\n'</span>, <span class="ident">buf</span>) {
<span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=></span> <span class="ident">i</span>,
<span class="prelude-val">None</span> <span class="op">=></span> <span class="kw">return</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write</span>(<span class="ident">buf</span>),
};
<span class="comment">// Ok, we're going to write a partial amount of the data given first</span>
<span class="comment">// followed by flushing the newline. After we've successfully written</span>
<span class="comment">// some data then we *must* report that we wrote that data, so future</span>
<span class="comment">// errors are ignored. We set our internal `need_flush` flag, though, in</span>
<span class="comment">// case flushing fails and we need to try it first next time.</span>
<span class="kw">let</span> <span class="ident">n</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">buf</span>[..=<span class="ident">i</span>])<span class="question-mark">?</span>;
<span class="self">self</span>.<span class="ident">need_flush</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">flush</span>().<span class="ident">is_err</span>() <span class="op">||</span> <span class="ident">n</span> <span class="op">!=</span> <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">n</span>)
}
<span class="comment">// At this point we successfully wrote `i + 1` bytes and flushed it out,</span>
<span class="comment">// meaning that the entire line is now flushed out on the screen. While</span>
<span class="comment">// we can attempt to finish writing the rest of the data provided.</span>
<span class="comment">// Remember though that we ignore errors here as we've successfully</span>
<span class="comment">// written data, so we need to report that.</span>
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write</span>(<span class="kw-2">&</span><span class="ident">buf</span>[<span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>..]) {
<span class="prelude-val">Ok</span>(<span class="ident">i</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">n</span> <span class="op">+</span> <span class="ident">i</span>),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">n</span>),
}
}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">flush</span>()<span class="question-mark">?</span>;
<span class="self">self</span>.<span class="ident">need_flush</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="prelude-val">Ok</span>(())
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rust1"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.0.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">W</span>: <span class="ident">Write</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">LineWriter</span><span class="op"><</span><span class="ident">W</span><span class="op">></span> <span class="kw">where</span> <span class="ident">W</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">fmt</span>.<span class="ident">debug_struct</span>(<span class="string">"LineWriter"</span>)
.<span class="ident">field</span>(<span class="string">"writer"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">inner</span>)
.<span class="ident">field</span>(<span class="string">"buffer"</span>,
<span class="kw-2">&</span><span class="macro">format_args</span><span class="macro">!</span>(<span class="string">"{}/{}"</span>, <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">buf</span>.<span class="ident">len</span>(), <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">buf</span>.<span class="ident">capacity</span>()))
.<span class="ident">finish</span>()
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">io</span>::{<span class="self">self</span>, <span class="ident">BufReader</span>, <span class="ident">BufWriter</span>, <span class="ident">LineWriter</span>, <span class="ident">SeekFrom</span>};
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicUsize</span>, <span class="ident">Ordering</span>};
<span class="kw">use</span> <span class="kw">crate</span>::<span class="ident">thread</span>;
<span class="doccomment">/// A dummy reader intended at testing short-reads propagation.</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ShortReader</span> {
<span class="ident">lengths</span>: <span class="ident">Vec</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>,
}
<span class="kw">impl</span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">ShortReader</span> {
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">lengths</span>.<span class="ident">is_empty</span>() {
<span class="prelude-val">Ok</span>(<span class="number">0</span>)
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">lengths</span>.<span class="ident">remove</span>(<span class="number">0</span>))
}
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_buffered_reader</span>() {
<span class="kw">let</span> <span class="ident">inner</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="number">2</span>, <span class="ident">inner</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let</span> <span class="ident">nread</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">nread</span>.<span class="ident">unwrap</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>, [<span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">buffer</span>(), []);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let</span> <span class="ident">nread</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">nread</span>.<span class="ident">unwrap</span>(), <span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>, [<span class="number">0</span>, <span class="number">1</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">buffer</span>(), []);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0</span>];
<span class="kw">let</span> <span class="ident">nread</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">nread</span>.<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>, [<span class="number">2</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">buffer</span>(), [<span class="number">3</span>]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="kw">let</span> <span class="ident">nread</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">nread</span>.<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>, [<span class="number">3</span>, <span class="number">0</span>, <span class="number">0</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">buffer</span>(), []);
<span class="kw">let</span> <span class="ident">nread</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">nread</span>.<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>, [<span class="number">4</span>, <span class="number">0</span>, <span class="number">0</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">buffer</span>(), []);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>(), <span class="number">0</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_buffered_reader_seek</span>() {
<span class="kw">let</span> <span class="ident">inner</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="number">2</span>, <span class="ident">io</span>::<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="ident">inner</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Start</span>(<span class="number">3</span>)).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="number">3</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>][..]));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="number">0</span>)).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="number">3</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>][..]));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="number">1</span>)).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="number">4</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">1</span>, <span class="number">2</span>][..]));
<span class="ident">reader</span>.<span class="ident">consume</span>(<span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="op">-</span><span class="number">2</span>)).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="number">3</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_buffered_reader_seek_relative</span>() {
<span class="kw">let</span> <span class="ident">inner</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="number">2</span>, <span class="ident">io</span>::<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="ident">inner</span>));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek_relative</span>(<span class="number">3</span>).<span class="ident">is_ok</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>][..]));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek_relative</span>(<span class="number">0</span>).<span class="ident">is_ok</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>][..]));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek_relative</span>(<span class="number">1</span>).<span class="ident">is_ok</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">1</span>][..]));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek_relative</span>(<span class="op">-</span><span class="number">1</span>).<span class="ident">is_ok</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>][..]));
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek_relative</span>(<span class="number">2</span>).<span class="ident">is_ok</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">2</span>, <span class="number">3</span>][..]));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_buffered_reader_invalidated_after_read</span>() {
<span class="kw">let</span> <span class="ident">inner</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="number">3</span>, <span class="ident">io</span>::<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="ident">inner</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>][..]));
<span class="ident">reader</span>.<span class="ident">consume</span>(<span class="number">3</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buffer</span>).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="number">5</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buffer</span>, [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>]);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek_relative</span>(<span class="op">-</span><span class="number">2</span>).<span class="ident">is_ok</span>());
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buffer</span>).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buffer</span>, [<span class="number">3</span>, <span class="number">4</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_buffered_reader_invalidated_after_seek</span>() {
<span class="kw">let</span> <span class="ident">inner</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="number">3</span>, <span class="ident">io</span>::<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="ident">inner</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>][..]));
<span class="ident">reader</span>.<span class="ident">consume</span>(<span class="number">3</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="number">5</span>)).<span class="ident">is_ok</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek_relative</span>(<span class="op">-</span><span class="number">2</span>).<span class="ident">is_ok</span>());
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buffer</span> <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buffer</span>).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="number">2</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buffer</span>, [<span class="number">3</span>, <span class="number">4</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_buffered_reader_seek_underflow</span>() {
<span class="comment">// gimmick reader that yields its position modulo 256 for each byte</span>
<span class="kw">struct</span> <span class="ident">PositionReader</span> {
<span class="ident">pos</span>: <span class="ident">u64</span>
}
<span class="kw">impl</span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">PositionReader</span> {
<span class="kw">fn</span> <span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> [<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">let</span> <span class="ident">len</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">len</span>();
<span class="kw">for</span> <span class="ident">x</span> <span class="kw">in</span> <span class="ident">buf</span> {
<span class="kw-2">*</span><span class="ident">x</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pos</span> <span class="kw">as</span> <span class="ident">u8</span>;
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pos</span>.<span class="ident">wrapping_add</span>(<span class="number">1</span>);
}
<span class="prelude-val">Ok</span>(<span class="ident">len</span>)
}
}
<span class="kw">impl</span> <span class="ident">Seek</span> <span class="kw">for</span> <span class="ident">PositionReader</span> {
<span class="kw">fn</span> <span class="ident">seek</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">pos</span>: <span class="ident">SeekFrom</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">pos</span> {
<span class="ident">SeekFrom</span>::<span class="ident">Start</span>(<span class="ident">n</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="ident">n</span>;
}
<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="ident">n</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">pos</span>.<span class="ident">wrapping_add</span>(<span class="ident">n</span> <span class="kw">as</span> <span class="ident">u64</span>);
}
<span class="ident">SeekFrom</span>::<span class="ident">End</span>(<span class="ident">n</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">pos</span> <span class="op">=</span> <span class="ident">u64</span>::<span class="ident">max_value</span>().<span class="ident">wrapping_add</span>(<span class="ident">n</span> <span class="kw">as</span> <span class="ident">u64</span>);
}
}
<span class="prelude-val">Ok</span>(<span class="self">self</span>.<span class="ident">pos</span>)
}
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="number">5</span>, <span class="ident">PositionReader</span> { <span class="ident">pos</span>: <span class="number">0</span> });
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>][..]));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">End</span>(<span class="op">-</span><span class="number">5</span>)).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="ident">u64</span>::<span class="ident">max_value</span>()<span class="op">-</span><span class="number">5</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">len</span>()), <span class="prelude-val">Some</span>(<span class="number">5</span>));
<span class="comment">// the following seek will require two underlying seeks</span>
<span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> <span class="number">9223372036854775802</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="ident">i64</span>::<span class="ident">min_value</span>())).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="ident">expected</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">fill_buf</span>().<span class="ident">ok</span>().<span class="ident">map</span>(<span class="op">|</span><span class="ident">s</span><span class="op">|</span> <span class="ident">s</span>.<span class="ident">len</span>()), <span class="prelude-val">Some</span>(<span class="number">5</span>));
<span class="comment">// seeking to 0 should empty the buffer.</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="number">0</span>)).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="ident">expected</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">get_ref</span>().<span class="ident">pos</span>, <span class="ident">expected</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_buffered_writer</span>() {
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">BufWriter</span>::<span class="ident">with_capacity</span>(<span class="number">2</span>, <span class="ident">inner</span>);
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">writer</span>.<span class="ident">buffer</span>(), []);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>]);
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">2</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">writer</span>.<span class="ident">buffer</span>(), [<span class="number">2</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>]);
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">3</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">writer</span>.<span class="ident">buffer</span>(), [<span class="number">2</span>, <span class="number">3</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>]);
<span class="ident">writer</span>.<span class="ident">flush</span>().<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">writer</span>.<span class="ident">buffer</span>(), []);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">4</span>]).<span class="ident">unwrap</span>();
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">5</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">writer</span>.<span class="ident">buffer</span>(), [<span class="number">4</span>, <span class="number">5</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">6</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">writer</span>.<span class="ident">buffer</span>(), [<span class="number">6</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]);
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">7</span>, <span class="number">8</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">writer</span>.<span class="ident">buffer</span>(), []);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>]);
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">writer</span>.<span class="ident">buffer</span>(), []);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>]);
<span class="ident">writer</span>.<span class="ident">flush</span>().<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">writer</span>.<span class="ident">buffer</span>(), []);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">10</span>, <span class="number">11</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_buffered_writer_inner_flushes</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">w</span> <span class="op">=</span> <span class="ident">BufWriter</span>::<span class="ident">with_capacity</span>(<span class="number">3</span>, <span class="ident">Vec</span>::<span class="ident">new</span>());
<span class="ident">w</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">w</span>.<span class="ident">get_ref</span>(), []);
<span class="kw">let</span> <span class="ident">w</span> <span class="op">=</span> <span class="ident">w</span>.<span class="ident">into_inner</span>().<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">w</span>, [<span class="number">0</span>, <span class="number">1</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_buffered_writer_seek</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">w</span> <span class="op">=</span> <span class="ident">BufWriter</span>::<span class="ident">with_capacity</span>(<span class="number">3</span>, <span class="ident">io</span>::<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="ident">Vec</span>::<span class="ident">new</span>()));
<span class="ident">w</span>.<span class="ident">write_all</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>]).<span class="ident">unwrap</span>();
<span class="ident">w</span>.<span class="ident">write_all</span>(<span class="kw-2">&</span>[<span class="number">6</span>, <span class="number">7</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">w</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Current</span>(<span class="number">0</span>)).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="number">8</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">w</span>.<span class="ident">get_ref</span>().<span class="ident">get_ref</span>()[..], <span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>][..]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">w</span>.<span class="ident">seek</span>(<span class="ident">SeekFrom</span>::<span class="ident">Start</span>(<span class="number">2</span>)).<span class="ident">ok</span>(), <span class="prelude-val">Some</span>(<span class="number">2</span>));
<span class="ident">w</span>.<span class="ident">write_all</span>(<span class="kw-2">&</span>[<span class="number">8</span>, <span class="number">9</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">w</span>.<span class="ident">into_inner</span>().<span class="ident">unwrap</span>().<span class="ident">into_inner</span>()[..], <span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">8</span>, <span class="number">9</span>, <span class="number">4</span>, <span class="number">5</span>, <span class="number">6</span>, <span class="number">7</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_read_until</span>() {
<span class="kw">let</span> <span class="ident">inner</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="kw-2">&</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">1</span>, <span class="number">0</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="number">2</span>, <span class="ident">inner</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="ident">reader</span>.<span class="ident">read_until</span>(<span class="number">0</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="number">0</span>]);
<span class="ident">v</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="ident">reader</span>.<span class="ident">read_until</span>(<span class="number">2</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="number">1</span>, <span class="number">2</span>]);
<span class="ident">v</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="ident">reader</span>.<span class="ident">read_until</span>(<span class="number">1</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="number">1</span>]);
<span class="ident">v</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="ident">reader</span>.<span class="ident">read_until</span>(<span class="number">8</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, [<span class="number">0</span>]);
<span class="ident">v</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="ident">reader</span>.<span class="ident">read_until</span>(<span class="number">9</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, []);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_line_buffer_fail_flush</span>() {
<span class="comment">// Issue #32085</span>
<span class="kw">struct</span> <span class="ident">FailFlushWriter</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>(<span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>);
<span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">FailFlushWriter</span><span class="op"><</span><span class="lifetime">'_</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="self">self</span>.<span class="number">0</span>.<span class="ident">extend_from_slice</span>(<span class="ident">buf</span>);
<span class="prelude-val">Ok</span>(<span class="ident">buf</span>.<span class="ident">len</span>())
}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Other</span>, <span class="string">"flush failed"</span>))
}
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">LineWriter</span>::<span class="ident">new</span>(<span class="ident">FailFlushWriter</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>));
<span class="kw">let</span> <span class="ident">to_write</span> <span class="op">=</span> <span class="string">b"abc\ndef"</span>;
<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Ok</span>(<span class="ident">written</span>) <span class="op">=</span> <span class="ident">writer</span>.<span class="ident">write</span>(<span class="ident">to_write</span>) {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">written</span> <span class="op"><</span> <span class="ident">to_write</span>.<span class="ident">len</span>(), <span class="string">"didn't flush on new line"</span>);
<span class="comment">// PASS</span>
<span class="kw">return</span>;
}
}
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">is_empty</span>(), <span class="string">"write returned an error but wrote data"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_line_buffer</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">LineWriter</span>::<span class="ident">new</span>(<span class="ident">Vec</span>::<span class="ident">new</span>());
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">0</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), []);
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">1</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), []);
<span class="ident">writer</span>.<span class="ident">flush</span>().<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>]);
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">0</span>, <span class="string">b'\n'</span>, <span class="number">1</span>, <span class="string">b'\n'</span>, <span class="number">2</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="string">b'\n'</span>, <span class="number">1</span>, <span class="string">b'\n'</span>]);
<span class="ident">writer</span>.<span class="ident">flush</span>().<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="string">b'\n'</span>, <span class="number">1</span>, <span class="string">b'\n'</span>, <span class="number">2</span>]);
<span class="ident">writer</span>.<span class="ident">write</span>(<span class="kw-2">&</span>[<span class="number">3</span>, <span class="string">b'\n'</span>]).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">*</span><span class="ident">writer</span>.<span class="ident">get_ref</span>(), [<span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>, <span class="string">b'\n'</span>, <span class="number">1</span>, <span class="string">b'\n'</span>, <span class="number">2</span>, <span class="number">3</span>, <span class="string">b'\n'</span>]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_read_line</span>() {
<span class="kw">let</span> <span class="ident">in_buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="string">b"a\nb\nc"</span>;
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="number">2</span>, <span class="ident">in_buf</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="ident">reader</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">s</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">"a\n"</span>);
<span class="ident">s</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="ident">reader</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">s</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">"b\n"</span>);
<span class="ident">s</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="ident">reader</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">s</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">"c"</span>);
<span class="ident">s</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="ident">reader</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">s</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>, <span class="string">""</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_lines</span>() {
<span class="kw">let</span> <span class="ident">in_buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>] <span class="op">=</span> <span class="string">b"a\nb\nc"</span>;
<span class="kw">let</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">with_capacity</span>(<span class="number">2</span>, <span class="ident">in_buf</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">it</span> <span class="op">=</span> <span class="ident">reader</span>.<span class="ident">lines</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">it</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">unwrap</span>(), <span class="string">"a"</span>.<span class="ident">to_string</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">it</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">unwrap</span>(), <span class="string">"b"</span>.<span class="ident">to_string</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">it</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">unwrap</span>(), <span class="string">"c"</span>.<span class="ident">to_string</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">it</span>.<span class="ident">next</span>().<span class="ident">is_none</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_short_reads</span>() {
<span class="kw">let</span> <span class="ident">inner</span> <span class="op">=</span> <span class="ident">ShortReader</span>{<span class="ident">lengths</span>: <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>, <span class="number">1</span>, <span class="number">2</span>, <span class="number">0</span>, <span class="number">1</span>, <span class="number">0</span>]};
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">reader</span> <span class="op">=</span> <span class="ident">BufReader</span>::<span class="ident">new</span>(<span class="ident">inner</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="number">0</span>, <span class="number">0</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>(), <span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">reader</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>(), <span class="number">0</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">should_panic</span>]</span>
<span class="kw">fn</span> <span class="ident">dont_panic_in_drop_on_panicked_flush</span>() {
<span class="kw">struct</span> <span class="ident">FailFlushWriter</span>;
<span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">FailFlushWriter</span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> { <span class="prelude-val">Ok</span>(<span class="ident">buf</span>.<span class="ident">len</span>()) }
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">last_os_error</span>())
}
}
<span class="kw">let</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">FailFlushWriter</span>;
<span class="kw">let</span> <span class="ident">_writer</span> <span class="op">=</span> <span class="ident">BufWriter</span>::<span class="ident">new</span>(<span class="ident">writer</span>);
<span class="comment">// If writer panics *again* due to the flush error then the process will</span>
<span class="comment">// abort.</span>
<span class="macro">panic</span><span class="macro">!</span>();
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg_attr</span>(<span class="ident">target_os</span> <span class="op">=</span> <span class="string">"emscripten"</span>, <span class="ident">ignore</span>)]</span>
<span class="kw">fn</span> <span class="ident">panic_in_write_doesnt_flush_in_drop</span>() {
<span class="kw">static</span> <span class="ident">WRITES</span>: <span class="ident">AtomicUsize</span> <span class="op">=</span> <span class="ident">AtomicUsize</span>::<span class="ident">new</span>(<span class="number">0</span>);
<span class="kw">struct</span> <span class="ident">PanicWriter</span>;
<span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">PanicWriter</span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="ident">WRITES</span>.<span class="ident">fetch_add</span>(<span class="number">1</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
<span class="macro">panic</span><span class="macro">!</span>();
}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> { <span class="prelude-val">Ok</span>(()) }
}
<span class="ident">thread</span>::<span class="ident">spawn</span>(<span class="op">||</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">writer</span> <span class="op">=</span> <span class="ident">BufWriter</span>::<span class="ident">new</span>(<span class="ident">PanicWriter</span>);
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">writer</span>.<span class="ident">write</span>(<span class="string">b"hello world"</span>);
<span class="kw">let</span> <span class="kw">_</span> <span class="op">=</span> <span class="ident">writer</span>.<span class="ident">flush</span>();
}).<span class="ident">join</span>().<span class="ident">unwrap_err</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">WRITES</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>), <span class="number">1</span>);
}
<span class="attribute">#[<span class="ident">bench</span>]</span>
<span class="kw">fn</span> <span class="ident">bench_buffered_reader</span>(<span class="ident">b</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">test</span>::<span class="ident">Bencher</span>) {
<span class="ident">b</span>.<span class="ident">iter</span>(<span class="op">||</span> {
<span class="ident">BufReader</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">empty</span>())
});
}
<span class="attribute">#[<span class="ident">bench</span>]</span>
<span class="kw">fn</span> <span class="ident">bench_buffered_writer</span>(<span class="ident">b</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">test</span>::<span class="ident">Bencher</span>) {
<span class="ident">b</span>.<span class="ident">iter</span>(<span class="op">||</span> {
<span class="ident">BufWriter</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">sink</span>())
});
}
<span class="kw">struct</span> <span class="ident">AcceptOneThenFail</span> {
<span class="ident">written</span>: <span class="ident">bool</span>,
<span class="ident">flushed</span>: <span class="ident">bool</span>,
}
<span class="kw">impl</span> <span class="ident">Write</span> <span class="kw">for</span> <span class="ident">AcceptOneThenFail</span> {
<span class="kw">fn</span> <span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">data</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">written</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">data</span>, <span class="string">b"a\nb\n"</span>);
<span class="self">self</span>.<span class="ident">written</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="prelude-val">Ok</span>(<span class="ident">data</span>.<span class="ident">len</span>())
} <span class="kw">else</span> {
<span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">NotFound</span>, <span class="string">"test"</span>))
}
}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="ident">io</span>::<span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="macro">assert</span><span class="macro">!</span>(<span class="self">self</span>.<span class="ident">written</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="op">!</span><span class="self">self</span>.<span class="ident">flushed</span>);
<span class="self">self</span>.<span class="ident">flushed</span> <span class="op">=</span> <span class="bool-val">true</span>;
<span class="prelude-val">Err</span>(<span class="ident">io</span>::<span class="ident">Error</span>::<span class="ident">new</span>(<span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Other</span>, <span class="string">"test"</span>))
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">erroneous_flush_retried</span>() {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="ident">AcceptOneThenFail</span> {
<span class="ident">written</span>: <span class="bool-val">false</span>,
<span class="ident">flushed</span>: <span class="bool-val">false</span>,
};
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">l</span> <span class="op">=</span> <span class="ident">LineWriter</span>::<span class="ident">new</span>(<span class="ident">a</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">l</span>.<span class="ident">write</span>(<span class="string">b"a\nb\na"</span>).<span class="ident">unwrap</span>(), <span class="number">4</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">l</span>.<span class="ident">get_ref</span>().<span class="ident">written</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">l</span>.<span class="ident">get_ref</span>().<span class="ident">flushed</span>);
<span class="ident">l</span>.<span class="ident">get_mut</span>().<span class="ident">flushed</span> <span class="op">=</span> <span class="bool-val">false</span>;
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">l</span>.<span class="ident">write</span>(<span class="string">b"a"</span>).<span class="ident">unwrap_err</span>().<span class="ident">kind</span>(), <span class="ident">io</span>::<span class="ident">ErrorKind</span>::<span class="ident">Other</span>)
}
}
</pre></div>
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Mageia
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