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</pre><pre class="rust ">
<span class="comment">// Copyright 2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! Traits, helpers, and type definitions for core I/O functionality.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The `std::io` module contains a number of common things you'll need</span>
<span class="doccomment">//! when doing input and output. The most core part of this module is</span>
<span class="doccomment">//! the [`Read`] and [`Write`] traits, which provide the</span>
<span class="doccomment">//! most general interface for reading and writing input and output.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Read and Write</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Because they are traits, [`Read`] and [`Write`] are implemented by a number</span>
<span class="doccomment">//! of other types, and you can implement them for your types too. As such,</span>
<span class="doccomment">//! you'll see a few different types of I/O throughout the documentation in</span>
<span class="doccomment">//! this module: [`File`]s, [`TcpStream`]s, and sometimes even [`Vec<T>`]s. For</span>
<span class="doccomment">//! example, [`Read`] adds a [`read`][`Read::read`] method, which we can use on</span>
<span class="doccomment">//! [`File`]s:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::io;</span>
<span class="doccomment">//! use std::io::prelude::*;</span>
<span class="doccomment">//! use std::fs::File;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # fn foo() -> io::Result<()> {</span>
<span class="doccomment">//! let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">//! let mut buffer = [0; 10];</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // read up to 10 bytes</span>
<span class="doccomment">//! f.read(&mut buffer)?;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! println!("The bytes: {:?}", buffer);</span>
<span class="doccomment">//! # Ok(())</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`Read`] and [`Write`] are so important, implementors of the two traits have a</span>
<span class="doccomment">//! nickname: readers and writers. So you'll sometimes see 'a reader' instead</span>
<span class="doccomment">//! of 'a type that implements the [`Read`] trait'. Much easier!</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Seek and BufRead</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Beyond that, there are two important traits that are provided: [`Seek`]</span>
<span class="doccomment">//! and [`BufRead`]. Both of these build on top of a reader to control</span>
<span class="doccomment">//! how the reading happens. [`Seek`] lets you control where the next byte is</span>
<span class="doccomment">//! coming from:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::io;</span>
<span class="doccomment">//! use std::io::prelude::*;</span>
<span class="doccomment">//! use std::io::SeekFrom;</span>
<span class="doccomment">//! use std::fs::File;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # fn foo() -> io::Result<()> {</span>
<span class="doccomment">//! let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">//! let mut buffer = [0; 10];</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // skip to the last 10 bytes of the file</span>
<span class="doccomment">//! f.seek(SeekFrom::End(-10))?;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // read up to 10 bytes</span>
<span class="doccomment">//! f.read(&mut buffer)?;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! println!("The bytes: {:?}", buffer);</span>
<span class="doccomment">//! # Ok(())</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`BufRead`] uses an internal buffer to provide a number of other ways to read, but</span>
<span class="doccomment">//! to show it off, we'll need to talk about buffers in general. Keep reading!</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## BufReader and BufWriter</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Byte-based interfaces are unwieldy and can be inefficient, as we'd need to be</span>
<span class="doccomment">//! making near-constant calls to the operating system. To help with this,</span>
<span class="doccomment">//! `std::io` comes with two structs, [`BufReader`] and [`BufWriter`], which wrap</span>
<span class="doccomment">//! readers and writers. The wrapper uses a buffer, reducing the number of</span>
<span class="doccomment">//! calls and providing nicer methods for accessing exactly what you want.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! For example, [`BufReader`] works with the [`BufRead`] trait to add extra</span>
<span class="doccomment">//! methods to any reader:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::io;</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 foo() -> io::Result<()> {</span>
<span class="doccomment">//! let f = File::open("foo.txt")?;</span>
<span class="doccomment">//! let mut reader = BufReader::new(f);</span>
<span class="doccomment">//! let mut buffer = String::new();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // read a line into buffer</span>
<span class="doccomment">//! reader.read_line(&mut buffer)?;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! println!("{}", buffer);</span>
<span class="doccomment">//! # Ok(())</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`BufWriter`] doesn't add any new ways of writing; it just buffers every call</span>
<span class="doccomment">//! to [`write`][`Write::write`]:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::io;</span>
<span class="doccomment">//! use std::io::prelude::*;</span>
<span class="doccomment">//! use std::io::BufWriter;</span>
<span class="doccomment">//! use std::fs::File;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # fn foo() -> io::Result<()> {</span>
<span class="doccomment">//! let f = File::create("foo.txt")?;</span>
<span class="doccomment">//! {</span>
<span class="doccomment">//! let mut writer = BufWriter::new(f);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! // write a byte to the buffer</span>
<span class="doccomment">//! writer.write(&[42])?;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! } // the buffer is flushed once writer goes out of scope</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Ok(())</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Standard input and output</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A very common source of input is standard input:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::io;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # fn foo() -> io::Result<()> {</span>
<span class="doccomment">//! let mut input = String::new();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! io::stdin().read_line(&mut input)?;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! println!("You typed: {}", input.trim());</span>
<span class="doccomment">//! # Ok(())</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Note that you cannot use the [`?` operator] in functions that do not return</span>
<span class="doccomment">//! a [`Result<T, E>`][`Result`] (e.g. `main`). Instead, you can call [`.unwrap()`]</span>
<span class="doccomment">//! or `match` on the return value to catch any possible errors:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::io;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! let mut input = String::new();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! io::stdin().read_line(&mut input).unwrap();</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! And a very common source of output is standard output:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::io;</span>
<span class="doccomment">//! use std::io::prelude::*;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # fn foo() -> io::Result<()> {</span>
<span class="doccomment">//! io::stdout().write(&[42])?;</span>
<span class="doccomment">//! # Ok(())</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Of course, using [`io::stdout`] directly is less common than something like</span>
<span class="doccomment">//! [`println!`].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Iterator types</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A large number of the structures provided by `std::io` are for various</span>
<span class="doccomment">//! ways of iterating over I/O. For example, [`Lines`] is used to split over</span>
<span class="doccomment">//! lines:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::io;</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 foo() -> io::Result<()> {</span>
<span class="doccomment">//! let f = File::open("foo.txt")?;</span>
<span class="doccomment">//! let reader = BufReader::new(f);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! for line in reader.lines() {</span>
<span class="doccomment">//! println!("{}", line?);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Ok(())</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Functions</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! There are a number of [functions][functions-list] that offer access to various</span>
<span class="doccomment">//! features. For example, we can use three of these functions to copy everything</span>
<span class="doccomment">//! from standard input to standard output:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::io;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # fn foo() -> io::Result<()> {</span>
<span class="doccomment">//! io::copy(&mut io::stdin(), &mut io::stdout())?;</span>
<span class="doccomment">//! # Ok(())</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [functions-list]: #functions-1</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## io::Result</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Last, but certainly not least, is [`io::Result`]. This type is used</span>
<span class="doccomment">//! as the return type of many `std::io` functions that can cause an error, and</span>
<span class="doccomment">//! can be returned from your own functions as well. Many of the examples in this</span>
<span class="doccomment">//! module use the [`?` operator]:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! use std::io;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn read_input() -> io::Result<()> {</span>
<span class="doccomment">//! let mut input = String::new();</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! io::stdin().read_line(&mut input)?;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! println!("You typed: {}", input.trim());</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Ok(())</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The return type of `read_input()`, [`io::Result<()>`][`io::Result`], is a very</span>
<span class="doccomment">//! common type for functions which don't have a 'real' return value, but do want to</span>
<span class="doccomment">//! return errors if they happen. In this case, the only purpose of this function is</span>
<span class="doccomment">//! to read the line and print it, so we use `()`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## Platform-specific behavior</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Many I/O functions throughout the standard library are documented to indicate</span>
<span class="doccomment">//! what various library or syscalls they are delegated to. This is done to help</span>
<span class="doccomment">//! applications both understand what's happening under the hood as well as investigate</span>
<span class="doccomment">//! any possibly unclear semantics. Note, however, that this is informative, not a binding</span>
<span class="doccomment">//! contract. The implementation of many of these functions are subject to change over</span>
<span class="doccomment">//! time and may call fewer or more syscalls/library functions.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`Read`]: trait.Read.html</span>
<span class="doccomment">//! [`Write`]: trait.Write.html</span>
<span class="doccomment">//! [`Seek`]: trait.Seek.html</span>
<span class="doccomment">//! [`BufRead`]: trait.BufRead.html</span>
<span class="doccomment">//! [`File`]: ../fs/struct.File.html</span>
<span class="doccomment">//! [`TcpStream`]: ../net/struct.TcpStream.html</span>
<span class="doccomment">//! [`Vec<T>`]: ../vec/struct.Vec.html</span>
<span class="doccomment">//! [`BufReader`]: struct.BufReader.html</span>
<span class="doccomment">//! [`BufWriter`]: struct.BufWriter.html</span>
<span class="doccomment">//! [`Write::write`]: trait.Write.html#tymethod.write</span>
<span class="doccomment">//! [`io::stdout`]: fn.stdout.html</span>
<span class="doccomment">//! [`println!`]: ../macro.println.html</span>
<span class="doccomment">//! [`Lines`]: struct.Lines.html</span>
<span class="doccomment">//! [`io::Result`]: type.Result.html</span>
<span class="doccomment">//! [`?` operator]: ../../book/first-edition/syntax-index.html</span>
<span class="doccomment">//! [`Read::read`]: trait.Read.html#tymethod.read</span>
<span class="doccomment">//! [`Result`]: ../result/enum.Result.html</span>
<span class="doccomment">//! [`.unwrap()`]: ../result/enum.Result.html#method.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">use</span> <span class="ident">cmp</span>;
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">str</span> <span class="kw">as</span> <span class="ident">core_str</span>;
<span class="kw">use</span> <span class="ident">error</span> <span class="kw">as</span> <span class="ident">std_error</span>;
<span class="kw">use</span> <span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">result</span>;
<span class="kw">use</span> <span class="ident">str</span>;
<span class="kw">use</span> <span class="ident">memchr</span>;
<span class="kw">use</span> <span class="ident">ptr</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">use</span> <span class="self">self</span>::<span class="ident">buffered</span>::{<span class="ident">BufReader</span>, <span class="ident">BufWriter</span>, <span class="ident">LineWriter</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">use</span> <span class="self">self</span>::<span class="ident">buffered</span>::<span class="ident">IntoInnerError</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">use</span> <span class="self">self</span>::<span class="ident">cursor</span>::<span class="ident">Cursor</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">use</span> <span class="self">self</span>::<span class="ident">error</span>::{<span class="prelude-ty">Result</span>, <span class="ident">Error</span>, <span class="ident">ErrorKind</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">use</span> <span class="self">self</span>::<span class="ident">util</span>::{<span class="ident">copy</span>, <span class="ident">sink</span>, <span class="ident">Sink</span>, <span class="ident">empty</span>, <span class="ident">Empty</span>, <span class="ident">repeat</span>, <span class="ident">Repeat</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">use</span> <span class="self">self</span>::<span class="ident">stdio</span>::{<span class="ident">stdin</span>, <span class="ident">stdout</span>, <span class="ident">stderr</span>, <span class="ident">Stdin</span>, <span class="ident">Stdout</span>, <span class="ident">Stderr</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">use</span> <span class="self">self</span>::<span class="ident">stdio</span>::{<span class="ident">StdoutLock</span>, <span class="ident">StderrLock</span>, <span class="ident">StdinLock</span>};
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"print_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"0"</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">stdio</span>::{<span class="ident">_print</span>, <span class="ident">_eprint</span>};
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"libstd_io_internals"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"42788"</span>)]</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">no_inline</span>, <span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">use</span> <span class="self">self</span>::<span class="ident">stdio</span>::{<span class="ident">set_panic</span>, <span class="ident">set_print</span>};
<span class="kw">pub</span> <span class="kw">mod</span> <span class="ident">prelude</span>;
<span class="kw">mod</span> <span class="ident">buffered</span>;
<span class="kw">mod</span> <span class="ident">cursor</span>;
<span class="kw">mod</span> <span class="ident">error</span>;
<span class="kw">mod</span> <span class="ident">impls</span>;
<span class="kw">mod</span> <span class="ident">lazy</span>;
<span class="kw">mod</span> <span class="ident">util</span>;
<span class="kw">mod</span> <span class="ident">stdio</span>;
<span class="kw">const</span> <span class="ident">DEFAULT_BUF_SIZE</span>: <span class="ident">usize</span> <span class="op">=</span> ::<span class="ident">sys_common</span>::<span class="ident">io</span>::<span class="ident">DEFAULT_BUF_SIZE</span>;
<span class="kw">struct</span> <span class="ident">Guard</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> { <span class="ident">buf</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="ident">len</span>: <span class="ident">usize</span> }
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Drop</span> <span class="kw">for</span> <span class="ident">Guard</span><span class="op"><</span><span class="lifetime">'a</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">unsafe</span> { <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">set_len</span>(<span class="self">self</span>.<span class="ident">len</span>); }
}
}
<span class="comment">// A few methods below (read_to_string, read_line) will append data into a</span>
<span class="comment">// `String` buffer, but we need to be pretty careful when doing this. The</span>
<span class="comment">// implementation will just call `.as_mut_vec()` and then delegate to a</span>
<span class="comment">// byte-oriented reading method, but we must ensure that when returning we never</span>
<span class="comment">// leave `buf` in a state such that it contains invalid UTF-8 in its bounds.</span>
<span class="comment">//</span>
<span class="comment">// To this end, we use an RAII guard (to protect against panics) which updates</span>
<span class="comment">// the length of the string when it is dropped. This guard initially truncates</span>
<span class="comment">// the string to the prior length and only after we've validated that the</span>
<span class="comment">// new contents are valid UTF-8 do we allow it to set a longer length.</span>
<span class="comment">//</span>
<span class="comment">// The unsafety in this function is twofold:</span>
<span class="comment">//</span>
<span class="comment">// 1. We're looking at the raw bytes of `buf`, so we take on the burden of UTF-8</span>
<span class="comment">// checks.</span>
<span class="comment">// 2. We're passing a raw buffer to the function `f`, and it is expected that</span>
<span class="comment">// the function only *appends* bytes to the buffer. We'll get undefined</span>
<span class="comment">// behavior if existing bytes are overwritten to have non-UTF-8 data.</span>
<span class="kw">fn</span> <span class="ident">append_to_string</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="ident">buf</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">String</span>, <span class="ident">f</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>
<span class="kw">where</span> <span class="ident">F</span>: <span class="ident">FnOnce</span>(<span class="kw-2">&</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="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>
{
<span class="kw">unsafe</span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">g</span> <span class="op">=</span> <span class="ident">Guard</span> { <span class="ident">len</span>: <span class="ident">buf</span>.<span class="ident">len</span>(), <span class="ident">buf</span>: <span class="ident">buf</span>.<span class="ident">as_mut_vec</span>() };
<span class="kw">let</span> <span class="ident">ret</span> <span class="op">=</span> <span class="ident">f</span>(<span class="ident">g</span>.<span class="ident">buf</span>);
<span class="kw">if</span> <span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="kw-2">&</span><span class="ident">g</span>.<span class="ident">buf</span>[<span class="ident">g</span>.<span class="ident">len</span>..]).<span class="ident">is_err</span>() {
<span class="ident">ret</span>.<span class="ident">and_then</span>(<span class="op">|</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">InvalidData</span>,
<span class="string">"stream did not contain valid UTF-8"</span>))
})
} <span class="kw">else</span> {
<span class="ident">g</span>.<span class="ident">len</span> <span class="op">=</span> <span class="ident">g</span>.<span class="ident">buf</span>.<span class="ident">len</span>();
<span class="ident">ret</span>
}
}
}
<span class="comment">// This uses an adaptive system to extend the vector when it fills. We want to</span>
<span class="comment">// avoid paying to allocate and zero a huge chunk of memory if the reader only</span>
<span class="comment">// has 4 bytes while still making large reads if the reader does have a ton</span>
<span class="comment">// of data to return. Simply tacking on an extra DEFAULT_BUF_SIZE space every</span>
<span class="comment">// time is 4,500 times (!) slower than this if the reader has a very small</span>
<span class="comment">// amount of data to return.</span>
<span class="comment">//</span>
<span class="comment">// Because we're extending the buffer with uninitialized data for trusted</span>
<span class="comment">// readers, we need to make sure to truncate that if any of this panics.</span>
<span class="kw">fn</span> <span class="ident">read_to_end</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="ident">r</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</span>, <span class="ident">buf</span>: <span class="kw-2">&</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="op">-></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">start_len</span> <span class="op">=</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">g</span> <span class="op">=</span> <span class="ident">Guard</span> { <span class="ident">len</span>: <span class="ident">buf</span>.<span class="ident">len</span>(), <span class="ident">buf</span>: <span class="ident">buf</span> };
<span class="kw">let</span> <span class="ident">ret</span>;
<span class="kw">loop</span> {
<span class="kw">if</span> <span class="ident">g</span>.<span class="ident">len</span> <span class="op">==</span> <span class="ident">g</span>.<span class="ident">buf</span>.<span class="ident">len</span>() {
<span class="kw">unsafe</span> {
<span class="ident">g</span>.<span class="ident">buf</span>.<span class="ident">reserve</span>(<span class="number">32</span>);
<span class="kw">let</span> <span class="ident">capacity</span> <span class="op">=</span> <span class="ident">g</span>.<span class="ident">buf</span>.<span class="ident">capacity</span>();
<span class="ident">g</span>.<span class="ident">buf</span>.<span class="ident">set_len</span>(<span class="ident">capacity</span>);
<span class="ident">r</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">g</span>.<span class="ident">buf</span>[<span class="ident">g</span>.<span class="ident">len</span>..]);
}
}
<span class="kw">match</span> <span class="ident">r</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">g</span>.<span class="ident">buf</span>[<span class="ident">g</span>.<span class="ident">len</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">Ok</span>(<span class="ident">g</span>.<span class="ident">len</span> <span class="op">-</span> <span class="ident">start_len</span>);
<span class="kw">break</span>;
}
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=></span> <span class="ident">g</span>.<span class="ident">len</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">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="ident">ret</span>
}
<span class="doccomment">/// The `Read` trait allows for reading bytes from a source.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementors of the `Read` trait are called 'readers'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Readers are defined by one required method, [`read()`]. Each call to [`read()`]</span>
<span class="doccomment">/// will attempt to pull bytes from this source into a provided buffer. A</span>
<span class="doccomment">/// number of other methods are implemented in terms of [`read()`], giving</span>
<span class="doccomment">/// implementors a number of ways to read bytes while only needing to implement</span>
<span class="doccomment">/// a single method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Readers are intended to be composable with one another. Many implementors</span>
<span class="doccomment">/// throughout [`std::io`] take and provide types which implement the `Read`</span>
<span class="doccomment">/// trait.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Please note that each call to [`read()`] may involve a system call, and</span>
<span class="doccomment">/// therefore, using something that implements [`BufRead`], such as</span>
<span class="doccomment">/// [`BufReader`], will be more efficient.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`]s implement `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut buffer = [0; 10];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read up to 10 bytes</span>
<span class="doccomment">/// f.read(&mut buffer)?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buffer = vec![0; 10];</span>
<span class="doccomment">/// // read the whole file</span>
<span class="doccomment">/// f.read_to_end(&mut buffer)?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read into a String, so that you don't need to do the conversion.</span>
<span class="doccomment">/// let mut buffer = String::new();</span>
<span class="doccomment">/// f.read_to_string(&mut buffer)?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // and more! See the other methods for more details.</span>
<span class="doccomment">/// # Ok(())</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Read from [`&str`] because [`&[u8]`][slice] implements `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut b = "This string will be read".as_bytes();</span>
<span class="doccomment">/// let mut buffer = [0; 10];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read up to 10 bytes</span>
<span class="doccomment">/// b.read(&mut buffer)?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // etc... it works exactly as a File does!</span>
<span class="doccomment">/// # Ok(())</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`read()`]: trait.Read.html#tymethod.read</span>
<span class="doccomment">/// [`std::io`]: ../../std/io/index.html</span>
<span class="doccomment">/// [`File`]: ../fs/struct.File.html</span>
<span class="doccomment">/// [`BufRead`]: trait.BufRead.html</span>
<span class="doccomment">/// [`BufReader`]: struct.BufReader.html</span>
<span class="doccomment">/// [`&str`]: ../../std/primitive.str.html</span>
<span class="doccomment">/// [slice]: ../../std/primitive.slice.html</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="attribute">#[<span class="ident">doc</span>(<span class="ident">spotlight</span>)]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Read</span> {
<span class="doccomment">/// Pull some bytes from this source into the specified buffer, returning</span>
<span class="doccomment">/// how many bytes were read.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function does not provide any guarantees about whether it blocks</span>
<span class="doccomment">/// waiting for data, but if an object needs to block for a read but cannot</span>
<span class="doccomment">/// it will typically signal this via an [`Err`] return value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the return value of this method is [`Ok(n)`], then it must be</span>
<span class="doccomment">/// guaranteed that `0 <= n <= buf.len()`. A nonzero `n` value indicates</span>
<span class="doccomment">/// that the buffer `buf` has been filled in with `n` bytes of data from this</span>
<span class="doccomment">/// source. If `n` is `0`, then it can indicate one of two scenarios:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// 1. This reader has reached its "end of file" and will likely no longer</span>
<span class="doccomment">/// be able to produce bytes. Note that this does not mean that the</span>
<span class="doccomment">/// reader will *always* no longer be able to produce bytes.</span>
<span class="doccomment">/// 2. The buffer specified was 0 bytes in length.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// No guarantees are provided about the contents of `buf` when this</span>
<span class="doccomment">/// function is called, implementations cannot rely on any property of the</span>
<span class="doccomment">/// contents of `buf` being true. It is recommended that implementations</span>
<span class="doccomment">/// only write data to `buf` instead of reading its contents.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If this function encounters any form of I/O or other error, an error</span>
<span class="doccomment">/// variant will be returned. If an error is returned then it must be</span>
<span class="doccomment">/// guaranteed that no bytes were read.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An error of the [`ErrorKind::Interrupted`] kind is non-fatal and the read</span>
<span class="doccomment">/// operation should be retried if there is nothing else to do.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`]s implement `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Err`]: ../../std/result/enum.Result.html#variant.Err</span>
<span class="doccomment">/// [`Ok(n)`]: ../../std/result/enum.Result.html#variant.Ok</span>
<span class="doccomment">/// [`ErrorKind::Interrupted`]: ../../std/io/enum.ErrorKind.html#variant.Interrupted</span>
<span class="doccomment">/// [`File`]: ../fs/struct.File.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut buffer = [0; 10];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read up to 10 bytes</span>
<span class="doccomment">/// f.read(&mut buffer[..])?;</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">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="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>;
<span class="doccomment">/// Determines if this `Read`er can work with buffers of uninitialized</span>
<span class="doccomment">/// memory.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The default implementation returns an initializer which will zero</span>
<span class="doccomment">/// buffers.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If a `Read`er guarantees that it can work properly with uninitialized</span>
<span class="doccomment">/// memory, it should call [`Initializer::nop()`]. See the documentation for</span>
<span class="doccomment">/// [`Initializer`] for details.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The behavior of this method must be independent of the state of the</span>
<span class="doccomment">/// `Read`er - the method only takes `&self` so that it can be used through</span>
<span class="doccomment">/// trait objects.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method is unsafe because a `Read`er could otherwise return a</span>
<span class="doccomment">/// non-zeroing `Initializer` from another `Read` type without an `unsafe`</span>
<span class="doccomment">/// block.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Initializer::nop()`]: ../../std/io/struct.Initializer.html#method.nop</span>
<span class="doccomment">/// [`Initializer`]: ../../std/io/struct.Initializer.html</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"read_initializer"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"42788"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</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="ident">Initializer</span>::<span class="ident">zeroing</span>()
}
<span class="doccomment">/// Read all bytes until EOF in this source, placing them into `buf`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// All bytes read from this source will be appended to the specified buffer</span>
<span class="doccomment">/// `buf`. This function will continuously call [`read()`] to append more data to</span>
<span class="doccomment">/// `buf` until [`read()`] returns either [`Ok(0)`] or an error of</span>
<span class="doccomment">/// non-[`ErrorKind::Interrupted`] kind.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If successful, this function will return the total number of bytes read.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If this function encounters an error of the kind</span>
<span class="doccomment">/// [`ErrorKind::Interrupted`] then the error is ignored and the operation</span>
<span class="doccomment">/// will continue.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If any other read error is encountered then this function immediately</span>
<span class="doccomment">/// returns. Any bytes which have already been read will be appended to</span>
<span class="doccomment">/// `buf`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`]s implement `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`read()`]: trait.Read.html#tymethod.read</span>
<span class="doccomment">/// [`Ok(0)`]: ../../std/result/enum.Result.html#variant.Ok</span>
<span class="doccomment">/// [`ErrorKind::Interrupted`]: ../../std/io/enum.ErrorKind.html#variant.Interrupted</span>
<span class="doccomment">/// [`File`]: ../fs/struct.File.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut buffer = Vec::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read the whole file</span>
<span class="doccomment">/// f.read_to_end(&mut buffer)?;</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">fn</span> <span class="ident">read_to_end</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">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="ident">read_to_end</span>(<span class="self">self</span>, <span class="ident">buf</span>)
}
<span class="doccomment">/// Read all bytes until EOF in this source, appending them to `buf`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If successful, this function returns the number of bytes which were read</span>
<span class="doccomment">/// and appended to `buf`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the data in this stream is *not* valid UTF-8 then an error is</span>
<span class="doccomment">/// returned and `buf` is unchanged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See [`read_to_end`][readtoend] for other error semantics.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [readtoend]: #method.read_to_end</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`][file]s implement `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [file]: ../fs/struct.File.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut buffer = String::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// f.read_to_string(&mut buffer)?;</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">fn</span> <span class="ident">read_to_string</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">String</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="comment">// Note that we do *not* call `.read_to_end()` here. We are passing</span>
<span class="comment">// `&mut Vec<u8>` (the raw contents of `buf`) into the `read_to_end`</span>
<span class="comment">// method to fill it up. An arbitrary implementation could overwrite the</span>
<span class="comment">// entire contents of the vector, not just append to it (which is what</span>
<span class="comment">// we are expecting).</span>
<span class="comment">//</span>
<span class="comment">// To prevent extraneously checking the UTF-8-ness of the entire buffer</span>
<span class="comment">// we pass it to our hardcoded `read_to_end` implementation which we</span>
<span class="comment">// know is guaranteed to only read data into the end of the buffer.</span>
<span class="ident">append_to_string</span>(<span class="ident">buf</span>, <span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">read_to_end</span>(<span class="self">self</span>, <span class="ident">b</span>))
}
<span class="doccomment">/// Read the exact number of bytes required to fill `buf`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function reads as many bytes as necessary to completely fill the</span>
<span class="doccomment">/// specified buffer `buf`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// No guarantees are provided about the contents of `buf` when this</span>
<span class="doccomment">/// function is called, implementations cannot rely on any property of the</span>
<span class="doccomment">/// contents of `buf` being true. It is recommended that implementations</span>
<span class="doccomment">/// only write data to `buf` instead of reading its contents.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If this function encounters an error of the kind</span>
<span class="doccomment">/// [`ErrorKind::Interrupted`] then the error is ignored and the operation</span>
<span class="doccomment">/// will continue.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If this function encounters an "end of file" before completely filling</span>
<span class="doccomment">/// the buffer, it returns an error of the kind [`ErrorKind::UnexpectedEof`].</span>
<span class="doccomment">/// The contents of `buf` are unspecified in this case.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If any other read error is encountered then this function immediately</span>
<span class="doccomment">/// returns. The contents of `buf` are unspecified in this case.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If this function returns an error, it is unspecified how many bytes it</span>
<span class="doccomment">/// has read, but it will never read more than would be necessary to</span>
<span class="doccomment">/// completely fill the buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`]s implement `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`]: ../fs/struct.File.html</span>
<span class="doccomment">/// [`ErrorKind::Interrupted`]: ../../std/io/enum.ErrorKind.html#variant.Interrupted</span>
<span class="doccomment">/// [`ErrorKind::UnexpectedEof`]: ../../std/io/enum.ErrorKind.html#variant.UnexpectedEof</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut buffer = [0; 10];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read exactly 10 bytes</span>
<span class="doccomment">/// f.read_exact(&mut buffer)?;</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">"read_exact"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.6.0"</span>)]</span>
<span class="kw">fn</span> <span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</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="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">while</span> <span class="op">!</span><span class="ident">buf</span>.<span class="ident">is_empty</span>() {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">read</span>(<span class="ident">buf</span>) {
<span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> <span class="kw">break</span>,
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=></span> { <span class="kw">let</span> <span class="ident">tmp</span> <span class="op">=</span> <span class="ident">buf</span>; <span class="ident">buf</span> <span class="op">=</span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">tmp</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">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="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>),
}
}
<span class="kw">if</span> <span class="op">!</span><span class="ident">buf</span>.<span class="ident">is_empty</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">UnexpectedEof</span>,
<span class="string">"failed to fill whole buffer"</span>))
} <span class="kw">else</span> {
<span class="prelude-val">Ok</span>(())
}
}
<span class="doccomment">/// Creates a "by reference" adaptor for this instance of `Read`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned adaptor also implements `Read` and will simply borrow this</span>
<span class="doccomment">/// current reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`][file]s implement `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [file]: ../fs/struct.File.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::Read;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut buffer = Vec::new();</span>
<span class="doccomment">/// let mut other_buffer = Vec::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// {</span>
<span class="doccomment">/// let reference = f.by_ref();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read at most 5 bytes</span>
<span class="doccomment">/// reference.take(5).read_to_end(&mut buffer)?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// } // drop our &mut reference so we can use f again</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // original file still usable, read the rest</span>
<span class="doccomment">/// f.read_to_end(&mut other_buffer)?;</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">fn</span> <span class="ident">by_ref</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="self">Self</span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> { <span class="self">self</span> }
<span class="doccomment">/// Transforms this `Read` instance to an [`Iterator`] over its bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned type implements [`Iterator`] where the `Item` is</span>
<span class="doccomment">/// [`Result`]`<`[`u8`]`, `[`io::Error`]`>`.</span>
<span class="doccomment">/// The yielded item is [`Ok`] if a byte was successfully read and [`Err`]</span>
<span class="doccomment">/// otherwise. EOF is mapped to returning [`None`] from this iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`][file]s implement `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [file]: ../fs/struct.File.html</span>
<span class="doccomment">/// [`Iterator`]: ../../std/iter/trait.Iterator.html</span>
<span class="doccomment">/// [`Result`]: ../../std/result/enum.Result.html</span>
<span class="doccomment">/// [`io::Error`]: ../../std/io/struct.Error.html</span>
<span class="doccomment">/// [`u8`]: ../../std/primitive.u8.html</span>
<span class="doccomment">/// [`Ok`]: ../../std/result/enum.Result.html#variant.Ok</span>
<span class="doccomment">/// [`Err`]: ../../std/result/enum.Result.html#variant.Err</span>
<span class="doccomment">/// [`None`]: ../../std/option/enum.Option.html#variant.None</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for byte in f.bytes() {</span>
<span class="doccomment">/// println!("{}", byte.unwrap());</span>
<span class="doccomment">/// }</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">fn</span> <span class="ident">bytes</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Bytes</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> {
<span class="ident">Bytes</span> { <span class="ident">inner</span>: <span class="self">self</span> }
}
<span class="doccomment">/// Transforms this `Read` instance to an [`Iterator`] over [`char`]s.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This adaptor will attempt to interpret this reader as a UTF-8 encoded</span>
<span class="doccomment">/// sequence of characters. The returned iterator will return [`None`] once</span>
<span class="doccomment">/// EOF is reached for this reader. Otherwise each element yielded will be a</span>
<span class="doccomment">/// [`Result`]`<`[`char`]`, E>` where `E` may contain information about what I/O error</span>
<span class="doccomment">/// occurred or where decoding failed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Currently this adaptor will discard intermediate data read, and should</span>
<span class="doccomment">/// be avoided if this is not desired.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`]s implement `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`]: ../fs/struct.File.html</span>
<span class="doccomment">/// [`Iterator`]: ../../std/iter/trait.Iterator.html</span>
<span class="doccomment">/// [`Result`]: ../../std/result/enum.Result.html</span>
<span class="doccomment">/// [`char`]: ../../std/primitive.char.html</span>
<span class="doccomment">/// [`None`]: ../../std/option/enum.Option.html#variant.None</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(io)]</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for c in f.chars() {</span>
<span class="doccomment">/// println!("{}", c.unwrap());</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">"io"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"the semantics of a partial read/write \
of where errors happen is currently \
unclear and may change"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"27802"</span>)]</span>
<span class="kw">fn</span> <span class="ident">chars</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Chars</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> {
<span class="ident">Chars</span> { <span class="ident">inner</span>: <span class="self">self</span> }
}
<span class="doccomment">/// Creates an adaptor which will chain this stream with another.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned `Read` instance will first read all bytes from this object</span>
<span class="doccomment">/// until EOF is encountered. Afterwards the output is equivalent to the</span>
<span class="doccomment">/// output of `next`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`][file]s implement `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [file]: ../fs/struct.File.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f1 = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut f2 = File::open("bar.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut handle = f1.chain(f2);</span>
<span class="doccomment">/// let mut buffer = String::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read the value into a String. We could use any Read method here,</span>
<span class="doccomment">/// // this is just one example.</span>
<span class="doccomment">/// handle.read_to_string(&mut buffer)?;</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">fn</span> <span class="ident">chain</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">Read</span><span class="op">></span>(<span class="self">self</span>, <span class="ident">next</span>: <span class="ident">R</span>) <span class="op">-></span> <span class="ident">Chain</span><span class="op"><</span><span class="self">Self</span>, <span class="ident">R</span><span class="op">></span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> {
<span class="ident">Chain</span> { <span class="ident">first</span>: <span class="self">self</span>, <span class="ident">second</span>: <span class="ident">next</span>, <span class="ident">done_first</span>: <span class="bool-val">false</span> }
}
<span class="doccomment">/// Creates an adaptor which will read at most `limit` bytes from it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function returns a new instance of `Read` which will read at most</span>
<span class="doccomment">/// `limit` bytes, after which it will always return EOF ([`Ok(0)`]). Any</span>
<span class="doccomment">/// read errors will not count towards the number of bytes read and future</span>
<span class="doccomment">/// calls to [`read()`] may succeed.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`]s implement `Read`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`]: ../fs/struct.File.html</span>
<span class="doccomment">/// [`Ok(0)`]: ../../std/result/enum.Result.html#variant.Ok</span>
<span class="doccomment">/// [`read()`]: trait.Read.html#tymethod.read</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut buffer = [0; 5];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read at most five bytes</span>
<span class="doccomment">/// let mut handle = f.take(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// handle.read(&mut buffer)?;</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">fn</span> <span class="ident">take</span>(<span class="self">self</span>, <span class="ident">limit</span>: <span class="ident">u64</span>) <span class="op">-></span> <span class="ident">Take</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> {
<span class="ident">Take</span> { <span class="ident">inner</span>: <span class="self">self</span>, <span class="ident">limit</span>: <span class="ident">limit</span> }
}
}
<span class="doccomment">/// A type used to conditionally initialize buffers passed to `Read` methods.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"read_initializer"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"42788"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Initializer</span>(<span class="ident">bool</span>);
<span class="kw">impl</span> <span class="ident">Initializer</span> {
<span class="doccomment">/// Returns a new `Initializer` which will zero out buffers.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"read_initializer"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"42788"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">zeroing</span>() <span class="op">-></span> <span class="ident">Initializer</span> {
<span class="ident">Initializer</span>(<span class="bool-val">true</span>)
}
<span class="doccomment">/// Returns a new `Initializer` which will not zero out buffers.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Safety</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This may only be called by `Read`ers which guarantee that they will not</span>
<span class="doccomment">/// read from buffers passed to `Read` methods, and that the return value of</span>
<span class="doccomment">/// the method accurately reflects the number of bytes that have been</span>
<span class="doccomment">/// written to the head of the buffer.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"read_initializer"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"42788"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">unsafe</span> <span class="kw">fn</span> <span class="ident">nop</span>() <span class="op">-></span> <span class="ident">Initializer</span> {
<span class="ident">Initializer</span>(<span class="bool-val">false</span>)
}
<span class="doccomment">/// Indicates if a buffer should be initialized.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"read_initializer"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"42788"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">should_initialize</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="self">self</span>.<span class="number">0</span>
}
<span class="doccomment">/// Initializes a buffer if necessary.</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"read_initializer"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"42788"</span>)]</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">initialize</span>(<span class="kw-2">&</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="kw">if</span> <span class="self">self</span>.<span class="ident">should_initialize</span>() {
<span class="kw">unsafe</span> { <span class="ident">ptr</span>::<span class="ident">write_bytes</span>(<span class="ident">buf</span>.<span class="ident">as_mut_ptr</span>(), <span class="number">0</span>, <span class="ident">buf</span>.<span class="ident">len</span>()) }
}
}
}
<span class="doccomment">/// A trait for objects which are byte-oriented sinks.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Implementors of the `Write` trait are sometimes called 'writers'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Writers are defined by two required methods, [`write`] and [`flush`]:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * The [`write`] method will attempt to write some data into the object,</span>
<span class="doccomment">/// returning how many bytes were successfully written.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// * The [`flush`] method is useful for adaptors and explicit buffers</span>
<span class="doccomment">/// themselves for ensuring that all buffered data has been pushed out to the</span>
<span class="doccomment">/// 'true sink'.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Writers are intended to be composable with one another. Many implementors</span>
<span class="doccomment">/// throughout [`std::io`] take and provide types which implement the `Write`</span>
<span class="doccomment">/// trait.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`write`]: #tymethod.write</span>
<span class="doccomment">/// [`flush`]: #tymethod.flush</span>
<span class="doccomment">/// [`std::io`]: index.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> std::io::Result<()> {</span>
<span class="doccomment">/// let mut buffer = File::create("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// buffer.write(b"some bytes")?;</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="attribute">#[<span class="ident">doc</span>(<span class="ident">spotlight</span>)]</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Write</span> {
<span class="doccomment">/// Write a buffer into this object, returning how many bytes were written.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will attempt to write the entire contents of `buf`, but</span>
<span class="doccomment">/// the entire write may not succeed, or the write may also generate an</span>
<span class="doccomment">/// error. A call to `write` represents *at most one* attempt to write to</span>
<span class="doccomment">/// any wrapped object.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Calls to `write` are not guaranteed to block waiting for data to be</span>
<span class="doccomment">/// written, and a write which would otherwise block can be indicated through</span>
<span class="doccomment">/// an [`Err`] variant.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the return value is [`Ok(n)`] then it must be guaranteed that</span>
<span class="doccomment">/// `0 <= n <= buf.len()`. A return value of `0` typically means that the</span>
<span class="doccomment">/// underlying object is no longer able to accept bytes and will likely not</span>
<span class="doccomment">/// be able to in the future as well, or that the buffer provided is empty.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each call to `write` may generate an I/O error indicating that the</span>
<span class="doccomment">/// operation could not be completed. If an error is returned then no bytes</span>
<span class="doccomment">/// in the buffer were written to this writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is **not** considered an error if the entire buffer could not be</span>
<span class="doccomment">/// written to this writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An error of the [`ErrorKind::Interrupted`] kind is non-fatal and the</span>
<span class="doccomment">/// write operation should be retried if there is nothing else to do.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Err`]: ../../std/result/enum.Result.html#variant.Err</span>
<span class="doccomment">/// [`Ok(n)`]: ../../std/result/enum.Result.html#variant.Ok</span>
<span class="doccomment">/// [`ErrorKind::Interrupted`]: ../../std/io/enum.ErrorKind.html#variant.Interrupted</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> std::io::Result<()> {</span>
<span class="doccomment">/// let mut buffer = File::create("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // Writes some prefix of the byte string, not necessarily all of it.</span>
<span class="doccomment">/// buffer.write(b"some bytes")?;</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">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="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span>;
<span class="doccomment">/// Flush this output stream, ensuring that all intermediately buffered</span>
<span class="doccomment">/// contents reach their destination.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is considered an error if not all bytes could be written due to</span>
<span class="doccomment">/// I/O errors or EOF being reached.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::io::BufWriter;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> std::io::Result<()> {</span>
<span class="doccomment">/// let mut buffer = BufWriter::new(File::create("foo.txt")?);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// buffer.write(b"some bytes")?;</span>
<span class="doccomment">/// buffer.flush()?;</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">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="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span>;
<span class="doccomment">/// Attempts to write an entire buffer into this write.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method will continuously call [`write`] until there is no more data</span>
<span class="doccomment">/// to be written or an error of non-[`ErrorKind::Interrupted`] kind is</span>
<span class="doccomment">/// returned. This method will not return until the entire buffer has been</span>
<span class="doccomment">/// successfully written or such an error occurs. The first error that is</span>
<span class="doccomment">/// not of [`ErrorKind::Interrupted`] kind generated from this method will be</span>
<span class="doccomment">/// returned.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will return the first error of</span>
<span class="doccomment">/// non-[`ErrorKind::Interrupted`] kind that [`write`] returns.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`ErrorKind::Interrupted`]: ../../std/io/enum.ErrorKind.html#variant.Interrupted</span>
<span class="doccomment">/// [`write`]: #tymethod.write</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> std::io::Result<()> {</span>
<span class="doccomment">/// let mut buffer = File::create("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// buffer.write_all(b"some bytes")?;</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">fn</span> <span class="ident">write_all</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="kw-2">mut</span> <span class="ident">buf</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="kw">while</span> <span class="op">!</span><span class="ident">buf</span>.<span class="ident">is_empty</span>() {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">write</span>(<span class="ident">buf</span>) {
<span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> <span class="kw">return</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 whole buffer"</span>)),
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=></span> <span class="ident">buf</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">buf</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">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="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>),
}
}
<span class="prelude-val">Ok</span>(())
}
<span class="doccomment">/// Writes a formatted string into this writer, returning any error</span>
<span class="doccomment">/// encountered.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This method is primarily used to interface with the</span>
<span class="doccomment">/// [`format_args!`][formatargs] macro, but it is rare that this should</span>
<span class="doccomment">/// explicitly be called. The [`write!`][write] macro should be favored to</span>
<span class="doccomment">/// invoke this method instead.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [formatargs]: ../macro.format_args.html</span>
<span class="doccomment">/// [write]: ../macro.write.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function internally uses the [`write_all`][writeall] method on</span>
<span class="doccomment">/// this trait and hence will continuously write data so long as no errors</span>
<span class="doccomment">/// are received. This also means that partial writes are not indicated in</span>
<span class="doccomment">/// this signature.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [writeall]: #method.write_all</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will return any I/O error reported while formatting.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> std::io::Result<()> {</span>
<span class="doccomment">/// let mut buffer = File::create("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // this call</span>
<span class="doccomment">/// write!(buffer, "{:.*}", 2, 1.234567)?;</span>
<span class="doccomment">/// // turns into this:</span>
<span class="doccomment">/// buffer.write_fmt(format_args!("{:.*}", 2, 1.234567))?;</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">fn</span> <span class="ident">write_fmt</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">fmt</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span> {
<span class="comment">// Create a shim which translates a Write to a fmt::Write and saves</span>
<span class="comment">// off I/O errors. instead of discarding them</span>
<span class="kw">struct</span> <span class="ident">Adaptor</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="question-mark">?</span><span class="ident">Sized</span> <span class="op">+</span> <span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="kw-2">mut</span> <span class="ident">T</span>,
<span class="ident">error</span>: <span class="prelude-ty">Result</span><span class="op"><</span>()<span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span>: <span class="ident">Write</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Write</span> <span class="kw">for</span> <span class="ident">Adaptor</span><span class="op"><</span><span class="lifetime">'a</span>, <span class="ident">T</span><span class="op">></span> {
<span class="kw">fn</span> <span class="ident">write_str</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">s</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">write_all</span>(<span class="ident">s</span>.<span class="ident">as_bytes</span>()) {
<span class="prelude-val">Ok</span>(()) <span class="op">=></span> <span class="prelude-val">Ok</span>(()),
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> {
<span class="self">self</span>.<span class="ident">error</span> <span class="op">=</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>);
<span class="prelude-val">Err</span>(<span class="ident">fmt</span>::<span class="ident">Error</span>)
}
}
}
}
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">output</span> <span class="op">=</span> <span class="ident">Adaptor</span> { <span class="ident">inner</span>: <span class="self">self</span>, <span class="ident">error</span>: <span class="prelude-val">Ok</span>(()) };
<span class="kw">match</span> <span class="ident">fmt</span>::<span class="ident">write</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">output</span>, <span class="ident">fmt</span>) {
<span class="prelude-val">Ok</span>(()) <span class="op">=></span> <span class="prelude-val">Ok</span>(()),
<span class="prelude-val">Err</span>(..) <span class="op">=></span> {
<span class="comment">// check if the error came from the underlying `Write` or not</span>
<span class="kw">if</span> <span class="ident">output</span>.<span class="ident">error</span>.<span class="ident">is_err</span>() {
<span class="ident">output</span>.<span class="ident">error</span>
} <span class="kw">else</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">Other</span>, <span class="string">"formatter error"</span>))
}
}
}
}
<span class="doccomment">/// Creates a "by reference" adaptor for this instance of `Write`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The returned adaptor also implements `Write` and will simply borrow this</span>
<span class="doccomment">/// current writer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::Write;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> std::io::Result<()> {</span>
<span class="doccomment">/// let mut buffer = File::create("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let reference = buffer.by_ref();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // we can use reference just like our original buffer</span>
<span class="doccomment">/// reference.write_all(b"some bytes")?;</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">fn</span> <span class="ident">by_ref</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="self">Self</span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> { <span class="self">self</span> }
}
<span class="doccomment">/// The `Seek` trait provides a cursor which can be moved within a stream of</span>
<span class="doccomment">/// bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The stream typically has a fixed size, allowing seeking relative to either</span>
<span class="doccomment">/// end or the current offset.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`File`][file]s implement `Seek`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [file]: ../fs/struct.File.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">/// use std::io::SeekFrom;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut f = File::open("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // move the cursor 42 bytes from the start of the file</span>
<span class="doccomment">/// f.seek(SeekFrom::Start(42))?;</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">trait</span> <span class="ident">Seek</span> {
<span class="doccomment">/// Seek to an offset, in bytes, in a stream.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A seek beyond the end of a stream is allowed, but implementation</span>
<span class="doccomment">/// defined.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If the seek operation completed successfully,</span>
<span class="doccomment">/// this method returns the new position from the start of the stream.</span>
<span class="doccomment">/// That position can be used later with [`SeekFrom::Start`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Seeking to a negative offset is considered an error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`SeekFrom::Start`]: enum.SeekFrom.html#variant.Start</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">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="prelude-ty">Result</span><span class="op"><</span><span class="ident">u64</span><span class="op">></span>;
}
<span class="doccomment">/// Enumeration of possible methods to seek within an I/O object.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is used by the [`Seek`] trait.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Seek`]: trait.Seek.html</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">PartialEq</span>, <span class="ident">Eq</span>, <span class="ident">Clone</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">enum</span> <span class="ident">SeekFrom</span> {
<span class="doccomment">/// Set the offset to the provided number of bytes.</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="ident">Start</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="ident">u64</span>),
<span class="doccomment">/// Set the offset to the size of this object plus the specified number of</span>
<span class="doccomment">/// bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is possible to seek beyond the end of an object, but it's an error to</span>
<span class="doccomment">/// seek before byte 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="ident">End</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="ident">i64</span>),
<span class="doccomment">/// Set the offset to the current position plus the specified number of</span>
<span class="doccomment">/// bytes.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// It is possible to seek beyond the end of an object, but it's an error to</span>
<span class="doccomment">/// seek before byte 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="ident">Current</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="ident">i64</span>),
}
<span class="kw">fn</span> <span class="ident">read_until</span><span class="op"><</span><span class="ident">R</span>: <span class="ident">BufRead</span> <span class="op">+</span> <span class="question-mark">?</span><span class="ident">Sized</span><span class="op">></span>(<span class="ident">r</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">R</span>, <span class="ident">delim</span>: <span class="ident">u8</span>, <span class="ident">buf</span>: <span class="kw-2">&</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="op">-></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="kw-2">mut</span> <span class="ident">read</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">loop</span> {
<span class="kw">let</span> (<span class="ident">done</span>, <span class="ident">used</span>) <span class="op">=</span> {
<span class="kw">let</span> <span class="ident">available</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">r</span>.<span class="ident">fill_buf</span>() {
<span class="prelude-val">Ok</span>(<span class="ident">n</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">ErrorKind</span>::<span class="ident">Interrupted</span> <span class="op">=></span> <span class="kw">continue</span>,
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">e</span>)
};
<span class="kw">match</span> <span class="ident">memchr</span>::<span class="ident">memchr</span>(<span class="ident">delim</span>, <span class="ident">available</span>) {
<span class="prelude-val">Some</span>(<span class="ident">i</span>) <span class="op">=></span> {
<span class="ident">buf</span>.<span class="ident">extend_from_slice</span>(<span class="kw-2">&</span><span class="ident">available</span>[..<span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>]);
(<span class="bool-val">true</span>, <span class="ident">i</span> <span class="op">+</span> <span class="number">1</span>)
}
<span class="prelude-val">None</span> <span class="op">=></span> {
<span class="ident">buf</span>.<span class="ident">extend_from_slice</span>(<span class="ident">available</span>);
(<span class="bool-val">false</span>, <span class="ident">available</span>.<span class="ident">len</span>())
}
}
};
<span class="ident">r</span>.<span class="ident">consume</span>(<span class="ident">used</span>);
<span class="ident">read</span> <span class="op">+=</span> <span class="ident">used</span>;
<span class="kw">if</span> <span class="ident">done</span> <span class="op">||</span> <span class="ident">used</span> <span class="op">==</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">read</span>);
}
}
}
<span class="doccomment">/// A `BufRead` is a type of `Read`er which has an internal buffer, allowing it</span>
<span class="doccomment">/// to perform extra ways of reading.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For example, reading line-by-line is inefficient without using a buffer, so</span>
<span class="doccomment">/// if you want to read by line, you'll need `BufRead`, which includes a</span>
<span class="doccomment">/// [`read_line`] method as well as a [`lines`] iterator.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A locked standard input implements `BufRead`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let stdin = io::stdin();</span>
<span class="doccomment">/// for line in stdin.lock().lines() {</span>
<span class="doccomment">/// println!("{}", line.unwrap());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If you have something that implements [`Read`], you can use the [`BufReader`</span>
<span class="doccomment">/// type][`BufReader`] to turn it into a `BufRead`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// For example, [`File`] implements [`Read`], but not `BufRead`.</span>
<span class="doccomment">/// [`BufReader`] to the rescue!</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`BufReader`]: struct.BufReader.html</span>
<span class="doccomment">/// [`File`]: ../fs/struct.File.html</span>
<span class="doccomment">/// [`read_line`]: #method.read_line</span>
<span class="doccomment">/// [`lines`]: #method.lines</span>
<span class="doccomment">/// [`Read`]: trait.Read.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::{self, BufReader};</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let f = File::open("foo.txt")?;</span>
<span class="doccomment">/// let f = BufReader::new(f);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// for line in f.lines() {</span>
<span class="doccomment">/// println!("{}", line.unwrap());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Ok(())</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">trait</span> <span class="ident">BufRead</span>: <span class="ident">Read</span> {
<span class="doccomment">/// Fills the internal buffer of this object, returning the buffer contents.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function is a lower-level call. It needs to be paired with the</span>
<span class="doccomment">/// [`consume`] method to function properly. When calling this</span>
<span class="doccomment">/// method, none of the contents will be "read" in the sense that later</span>
<span class="doccomment">/// calling `read` may return the same contents. As such, [`consume`] must</span>
<span class="doccomment">/// be called with the number of bytes that are consumed from this buffer to</span>
<span class="doccomment">/// ensure that the bytes are never returned twice.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`consume`]: #tymethod.consume</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An empty buffer returned indicates that the stream has reached EOF.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will return an I/O error if the underlying reader was</span>
<span class="doccomment">/// read, but returned an error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A locked standard input implements `BufRead`:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let stdin = io::stdin();</span>
<span class="doccomment">/// let mut stdin = stdin.lock();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // we can't have two `&mut` references to `stdin`, so use a block</span>
<span class="doccomment">/// // to end the borrow early.</span>
<span class="doccomment">/// let length = {</span>
<span class="doccomment">/// let buffer = stdin.fill_buf().unwrap();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // work with buffer</span>
<span class="doccomment">/// println!("{:?}", buffer);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// buffer.len()</span>
<span class="doccomment">/// };</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // ensure the bytes we worked with aren't returned again later</span>
<span class="doccomment">/// stdin.consume(length);</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">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="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">u8</span>]<span class="op">></span>;
<span class="doccomment">/// Tells this buffer that `amt` bytes have been consumed from the buffer,</span>
<span class="doccomment">/// so they should no longer be returned in calls to `read`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function is a lower-level call. It needs to be paired with the</span>
<span class="doccomment">/// [`fill_buf`] method to function properly. This function does</span>
<span class="doccomment">/// not perform any I/O, it simply informs this object that some amount of</span>
<span class="doccomment">/// its buffer, returned from [`fill_buf`], has been consumed and should</span>
<span class="doccomment">/// no longer be returned. As such, this function may do odd things if</span>
<span class="doccomment">/// [`fill_buf`] isn't called before calling it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The `amt` must be `<=` the number of bytes in the buffer returned by</span>
<span class="doccomment">/// [`fill_buf`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Since `consume()` is meant to be used with [`fill_buf`],</span>
<span class="doccomment">/// that method's example includes an example of `consume()`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`fill_buf`]: #tymethod.fill_buf</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">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="doccomment">/// Read all bytes into `buf` until the delimiter `byte` or EOF is reached.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will read bytes from the underlying stream until the</span>
<span class="doccomment">/// delimiter or EOF is found. Once found, all bytes up to, and including,</span>
<span class="doccomment">/// the delimiter (if found) will be appended to `buf`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If successful, this function will return the total number of bytes read.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An empty buffer returned indicates that the stream has reached EOF.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will ignore all instances of [`ErrorKind::Interrupted`] and</span>
<span class="doccomment">/// will otherwise return any errors returned by [`fill_buf`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If an I/O error is encountered then all bytes read so far will be</span>
<span class="doccomment">/// present in `buf` and its length will have been adjusted appropriately.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`fill_buf`]: #tymethod.fill_buf</span>
<span class="doccomment">/// [`ErrorKind::Interrupted`]: enum.ErrorKind.html#variant.Interrupted</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`std::io::Cursor`][`Cursor`] is a type that implements `BufRead`. In</span>
<span class="doccomment">/// this example, we use [`Cursor`] to read all the bytes in a byte slice</span>
<span class="doccomment">/// in hyphen delimited segments:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Cursor`]: struct.Cursor.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::{self, BufRead};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut cursor = io::Cursor::new(b"lorem-ipsum");</span>
<span class="doccomment">/// let mut buf = vec![];</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // cursor is at 'l'</span>
<span class="doccomment">/// let num_bytes = cursor.read_until(b'-', &mut buf)</span>
<span class="doccomment">/// .expect("reading from cursor won't fail");</span>
<span class="doccomment">/// assert_eq!(num_bytes, 6);</span>
<span class="doccomment">/// assert_eq!(buf, b"lorem-");</span>
<span class="doccomment">/// buf.clear();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // cursor is at 'i'</span>
<span class="doccomment">/// let num_bytes = cursor.read_until(b'-', &mut buf)</span>
<span class="doccomment">/// .expect("reading from cursor won't fail");</span>
<span class="doccomment">/// assert_eq!(num_bytes, 5);</span>
<span class="doccomment">/// assert_eq!(buf, b"ipsum");</span>
<span class="doccomment">/// buf.clear();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // cursor is at EOF</span>
<span class="doccomment">/// let num_bytes = cursor.read_until(b'-', &mut buf)</span>
<span class="doccomment">/// .expect("reading from cursor won't fail");</span>
<span class="doccomment">/// assert_eq!(num_bytes, 0);</span>
<span class="doccomment">/// assert_eq!(buf, b"");</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">fn</span> <span class="ident">read_until</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">byte</span>: <span class="ident">u8</span>, <span class="ident">buf</span>: <span class="kw-2">&</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="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="ident">read_until</span>(<span class="self">self</span>, <span class="ident">byte</span>, <span class="ident">buf</span>)
}
<span class="doccomment">/// Read all bytes until a newline (the 0xA byte) is reached, and append</span>
<span class="doccomment">/// them to the provided buffer.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will read bytes from the underlying stream until the</span>
<span class="doccomment">/// newline delimiter (the 0xA byte) or EOF is found. Once found, all bytes</span>
<span class="doccomment">/// up to, and including, the delimiter (if found) will be appended to</span>
<span class="doccomment">/// `buf`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If successful, this function will return the total number of bytes read.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An empty buffer returned indicates that the stream has reached EOF.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function has the same error semantics as [`read_until`] and will</span>
<span class="doccomment">/// also return an error if the read bytes are not valid UTF-8. If an I/O</span>
<span class="doccomment">/// error is encountered then `buf` may contain some bytes already read in</span>
<span class="doccomment">/// the event that all data read so far was valid UTF-8.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`std::io::Cursor`][`Cursor`] is a type that implements `BufRead`. In</span>
<span class="doccomment">/// this example, we use [`Cursor`] to read all the lines in a byte slice:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Cursor`]: struct.Cursor.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::{self, BufRead};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut cursor = io::Cursor::new(b"foo\nbar");</span>
<span class="doccomment">/// let mut buf = String::new();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // cursor is at 'f'</span>
<span class="doccomment">/// let num_bytes = cursor.read_line(&mut buf)</span>
<span class="doccomment">/// .expect("reading from cursor won't fail");</span>
<span class="doccomment">/// assert_eq!(num_bytes, 4);</span>
<span class="doccomment">/// assert_eq!(buf, "foo\n");</span>
<span class="doccomment">/// buf.clear();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // cursor is at 'b'</span>
<span class="doccomment">/// let num_bytes = cursor.read_line(&mut buf)</span>
<span class="doccomment">/// .expect("reading from cursor won't fail");</span>
<span class="doccomment">/// assert_eq!(num_bytes, 3);</span>
<span class="doccomment">/// assert_eq!(buf, "bar");</span>
<span class="doccomment">/// buf.clear();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // cursor is at EOF</span>
<span class="doccomment">/// let num_bytes = cursor.read_line(&mut buf)</span>
<span class="doccomment">/// .expect("reading from cursor won't fail");</span>
<span class="doccomment">/// assert_eq!(num_bytes, 0);</span>
<span class="doccomment">/// assert_eq!(buf, "");</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">fn</span> <span class="ident">read_line</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">String</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="comment">// Note that we are not calling the `.read_until` method here, but</span>
<span class="comment">// rather our hardcoded implementation. For more details as to why, see</span>
<span class="comment">// the comments in `read_to_end`.</span>
<span class="ident">append_to_string</span>(<span class="ident">buf</span>, <span class="op">|</span><span class="ident">b</span><span class="op">|</span> <span class="ident">read_until</span>(<span class="self">self</span>, <span class="string">b'\n'</span>, <span class="ident">b</span>))
}
<span class="doccomment">/// Returns an iterator over the contents of this reader split on the byte</span>
<span class="doccomment">/// `byte`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The iterator returned from this function will return instances of</span>
<span class="doccomment">/// [`io::Result`]`<`[`Vec<u8>`]`>`. Each vector returned will *not* have</span>
<span class="doccomment">/// the delimiter byte at the end.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function will yield errors whenever [`read_until`] would have</span>
<span class="doccomment">/// also yielded an error.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`io::Result`]: type.Result.html</span>
<span class="doccomment">/// [`Vec<u8>`]: ../vec/struct.Vec.html</span>
<span class="doccomment">/// [`read_until`]: #method.read_until</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`std::io::Cursor`][`Cursor`] is a type that implements `BufRead`. In</span>
<span class="doccomment">/// this example, we use [`Cursor`] to iterate over all hyphen delimited</span>
<span class="doccomment">/// segments in a byte slice</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Cursor`]: struct.Cursor.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::{self, BufRead};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let cursor = io::Cursor::new(b"lorem-ipsum-dolor");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut split_iter = cursor.split(b'-').map(|l| l.unwrap());</span>
<span class="doccomment">/// assert_eq!(split_iter.next(), Some(b"lorem".to_vec()));</span>
<span class="doccomment">/// assert_eq!(split_iter.next(), Some(b"ipsum".to_vec()));</span>
<span class="doccomment">/// assert_eq!(split_iter.next(), Some(b"dolor".to_vec()));</span>
<span class="doccomment">/// assert_eq!(split_iter.next(), None);</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">fn</span> <span class="ident">split</span>(<span class="self">self</span>, <span class="ident">byte</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">Split</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> {
<span class="ident">Split</span> { <span class="ident">buf</span>: <span class="self">self</span>, <span class="ident">delim</span>: <span class="ident">byte</span> }
}
<span class="doccomment">/// Returns an iterator over the lines of this reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The iterator returned from this function will yield instances of</span>
<span class="doccomment">/// [`io::Result`]`<`[`String`]`>`. Each string returned will *not* have a newline</span>
<span class="doccomment">/// byte (the 0xA byte) or CRLF (0xD, 0xA bytes) at the end.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`io::Result`]: type.Result.html</span>
<span class="doccomment">/// [`String`]: ../string/struct.String.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`std::io::Cursor`][`Cursor`] is a type that implements `BufRead`. In</span>
<span class="doccomment">/// this example, we use [`Cursor`] to iterate over all the lines in a byte</span>
<span class="doccomment">/// slice.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Cursor`]: struct.Cursor.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io::{self, BufRead};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let cursor = io::Cursor::new(b"lorem\nipsum\r\ndolor");</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut lines_iter = cursor.lines().map(|l| l.unwrap());</span>
<span class="doccomment">/// assert_eq!(lines_iter.next(), Some(String::from("lorem")));</span>
<span class="doccomment">/// assert_eq!(lines_iter.next(), Some(String::from("ipsum")));</span>
<span class="doccomment">/// assert_eq!(lines_iter.next(), Some(String::from("dolor")));</span>
<span class="doccomment">/// assert_eq!(lines_iter.next(), None);</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Each line of the iterator has the same error semantics as [`BufRead::read_line`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`BufRead::read_line`]: trait.BufRead.html#method.read_line</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">fn</span> <span class="ident">lines</span>(<span class="self">self</span>) <span class="op">-></span> <span class="ident">Lines</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> <span class="kw">where</span> <span class="self">Self</span>: <span class="ident">Sized</span> {
<span class="ident">Lines</span> { <span class="ident">buf</span>: <span class="self">self</span> }
}
}
<span class="doccomment">/// Adaptor to chain together two readers.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This struct is generally created by calling [`chain`] on a reader.</span>
<span class="doccomment">/// Please see the documentation of [`chain`] for more details.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`chain`]: trait.Read.html#method.chain</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">Chain</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">U</span><span class="op">></span> {
<span class="ident">first</span>: <span class="ident">T</span>,
<span class="ident">second</span>: <span class="ident">U</span>,
<span class="ident">done_first</span>: <span class="ident">bool</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">U</span><span class="op">></span> <span class="ident">Chain</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">U</span><span class="op">></span> {
<span class="doccomment">/// Consumes the `Chain`, returning the wrapped readers.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut foo_file = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut bar_file = File::open("bar.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let chain = foo_file.chain(bar_file);</span>
<span class="doccomment">/// let (foo_file, bar_file) = chain.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">"more_io_inner_methods"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</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">T</span>, <span class="ident">U</span>) {
(<span class="self">self</span>.<span class="ident">first</span>, <span class="self">self</span>.<span class="ident">second</span>)
}
<span class="doccomment">/// Gets references to the underlying readers in this `Chain`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut foo_file = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut bar_file = File::open("bar.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let chain = foo_file.chain(bar_file);</span>
<span class="doccomment">/// let (foo_file, bar_file) = chain.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">"more_io_inner_methods"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</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">T</span>, <span class="kw-2">&</span><span class="ident">U</span>) {
(<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">first</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">second</span>)
}
<span class="doccomment">/// Gets mutable references to the underlying readers in this `Chain`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Care should be taken to avoid modifying the internal I/O state of the</span>
<span class="doccomment">/// underlying readers as doing so may corrupt the internal state of this</span>
<span class="doccomment">/// `Chain`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// # use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut foo_file = File::open("foo.txt")?;</span>
<span class="doccomment">/// let mut bar_file = File::open("bar.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut chain = foo_file.chain(bar_file);</span>
<span class="doccomment">/// let (foo_file, bar_file) = chain.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">"more_io_inner_methods"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</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">T</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">U</span>) {
(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">first</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">second</span>)
}
}
<span class="attribute">#[<span class="ident">stable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std_debug"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.16.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span>, <span class="ident">U</span>: <span class="ident">fmt</span>::<span class="ident">Debug</span><span class="op">></span> <span class="ident">fmt</span>::<span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Chain</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">U</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="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">f</span>.<span class="ident">debug_struct</span>(<span class="string">"Chain"</span>)
.<span class="ident">field</span>(<span class="string">"t"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">first</span>)
.<span class="ident">field</span>(<span class="string">"u"</span>, <span class="kw-2">&</span><span class="self">self</span>.<span class="ident">second</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">T</span>: <span class="ident">Read</span>, <span class="ident">U</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">Chain</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">U</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="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">done_first</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">first</span>.<span class="ident">read</span>(<span class="ident">buf</span>)<span class="question-mark">?</span> {
<span class="number">0</span> <span class="kw">if</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">!=</span> <span class="number">0</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">done_first</span> <span class="op">=</span> <span class="bool-val">true</span>; }
<span class="ident">n</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">n</span>),
}
}
<span class="self">self</span>.<span class="ident">second</span>.<span class="ident">read</span>(<span class="ident">buf</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="kw">let</span> <span class="ident">initializer</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">first</span>.<span class="ident">initializer</span>();
<span class="kw">if</span> <span class="ident">initializer</span>.<span class="ident">should_initialize</span>() {
<span class="ident">initializer</span>
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">second</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">"chain_bufread"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.9.0"</span>)]</span>
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span>: <span class="ident">BufRead</span>, <span class="ident">U</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">BufRead</span> <span class="kw">for</span> <span class="ident">Chain</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">U</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="prelude-ty">Result</span><span class="op"><</span><span class="kw-2">&</span>[<span class="ident">u8</span>]<span class="op">></span> {
<span class="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">done_first</span> {
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">first</span>.<span class="ident">fill_buf</span>()<span class="question-mark">?</span> {
<span class="ident">buf</span> <span class="kw">if</span> <span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="number">0</span> <span class="op">=></span> { <span class="self">self</span>.<span class="ident">done_first</span> <span class="op">=</span> <span class="bool-val">true</span>; }
<span class="ident">buf</span> <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="ident">buf</span>),
}
}
<span class="self">self</span>.<span class="ident">second</span>.<span class="ident">fill_buf</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="kw">if</span> <span class="op">!</span><span class="self">self</span>.<span class="ident">done_first</span> {
<span class="self">self</span>.<span class="ident">first</span>.<span class="ident">consume</span>(<span class="ident">amt</span>)
} <span class="kw">else</span> {
<span class="self">self</span>.<span class="ident">second</span>.<span class="ident">consume</span>(<span class="ident">amt</span>)
}
}
}
<span class="doccomment">/// Reader adaptor which limits the bytes read from an underlying reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This struct is generally created by calling [`take`] on a reader.</span>
<span class="doccomment">/// Please see the documentation of [`take`] for more details.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`take`]: trait.Read.html#method.take</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="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Take</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="ident">inner</span>: <span class="ident">T</span>,
<span class="ident">limit</span>: <span class="ident">u64</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> <span class="ident">Take</span><span class="op"><</span><span class="ident">T</span><span class="op">></span> {
<span class="doccomment">/// Returns the number of bytes that can be read before this instance will</span>
<span class="doccomment">/// return EOF.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Note</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This instance may reach `EOF` after reading fewer bytes than indicated by</span>
<span class="doccomment">/// this method if the underlying [`Read`] instance reaches EOF.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Read`]: ../../std/io/trait.Read.html</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let f = File::open("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read at most five bytes</span>
<span class="doccomment">/// let handle = f.take(5);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("limit: {}", handle.limit());</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">limit</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">u64</span> { <span class="self">self</span>.<span class="ident">limit</span> }
<span class="doccomment">/// Sets the number of bytes that can be read before this instance will</span>
<span class="doccomment">/// return EOF. This is the same as constructing a new `Take` instance, so</span>
<span class="doccomment">/// the amount of bytes read and the previous limit value don't matter when</span>
<span class="doccomment">/// calling this method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// #![feature(take_set_limit)]</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let f = File::open("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// // read at most five bytes</span>
<span class="doccomment">/// let mut handle = f.take(5);</span>
<span class="doccomment">/// handle.set_limit(10);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// assert_eq!(handle.limit(), 10);</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">"take_set_limit"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"42781"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_limit</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">limit</span>: <span class="ident">u64</span>) {
<span class="self">self</span>.<span class="ident">limit</span> <span class="op">=</span> <span class="ident">limit</span>;
}
<span class="doccomment">/// Consumes the `Take`, returning the wrapped reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut file = File::open("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buffer = [0; 5];</span>
<span class="doccomment">/// let mut handle = file.take(5);</span>
<span class="doccomment">/// handle.read(&mut buffer)?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let file = handle.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">"io_take_into_inner"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.15.0"</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">T</span> {
<span class="self">self</span>.<span class="ident">inner</span>
}
<span class="doccomment">/// Gets a reference to the underlying reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut file = File::open("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buffer = [0; 5];</span>
<span class="doccomment">/// let mut handle = file.take(5);</span>
<span class="doccomment">/// handle.read(&mut buffer)?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let file = handle.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">"more_io_inner_methods"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</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">T</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">/// Care should be taken to avoid modifying the internal I/O state of the</span>
<span class="doccomment">/// underlying reader as doing so may corrupt the internal limit of this</span>
<span class="doccomment">/// `Take`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">/// use std::io;</span>
<span class="doccomment">/// use std::io::prelude::*;</span>
<span class="doccomment">/// use std::fs::File;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn foo() -> io::Result<()> {</span>
<span class="doccomment">/// let mut file = File::open("foo.txt")?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let mut buffer = [0; 5];</span>
<span class="doccomment">/// let mut handle = file.take(5);</span>
<span class="doccomment">/// handle.read(&mut buffer)?;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let file = handle.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">"more_io_inner_methods"</span>, <span class="ident">since</span> <span class="op">=</span> <span class="string">"1.20.0"</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">T</span> {
<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">inner</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">T</span>: <span class="ident">Read</span><span class="op">></span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">Take</span><span class="op"><</span><span class="ident">T</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="prelude-ty">Result</span><span class="op"><</span><span class="ident">usize</span><span class="op">></span> {
<span class="comment">// Don't call into inner reader at all at EOF because it may still block</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">limit</span> <span class="op">==</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="number">0</span>);
}
<span class="kw">let</span> <span class="ident">max</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">u64</span>, <span class="self">self</span>.<span class="ident">limit</span>) <span class="kw">as</span> <span class="ident">usize</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">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>[..<span class="ident">max</span>])<span class="question-mark">?</span>;
<span class="self">self</span>.<span class="ident">limit</span> <span class="op">-=</span> <span class="ident">n</span> <span class="kw">as</span> <span class="ident">u64</span>;
<span class="prelude-val">Ok</span>(<span class="ident">n</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">T</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">BufRead</span> <span class="kw">for</span> <span class="ident">Take</span><span class="op"><</span><span class="ident">T</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="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">// Don't call into inner reader at all at EOF because it may still block</span>
<span class="kw">if</span> <span class="self">self</span>.<span class="ident">limit</span> <span class="op">==</span> <span class="number">0</span> {
<span class="kw">return</span> <span class="prelude-val">Ok</span>(<span class="kw-2">&</span>[]);
}
<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">fill_buf</span>()<span class="question-mark">?</span>;
<span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">buf</span>.<span class="ident">len</span>() <span class="kw">as</span> <span class="ident">u64</span>, <span class="self">self</span>.<span class="ident">limit</span>) <span class="kw">as</span> <span class="ident">usize</span>;
<span class="prelude-val">Ok</span>(<span class="kw-2">&</span><span class="ident">buf</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="comment">// Don't let callers reset the limit by passing an overlarge value</span>
<span class="kw">let</span> <span class="ident">amt</span> <span class="op">=</span> <span class="ident">cmp</span>::<span class="ident">min</span>(<span class="ident">amt</span> <span class="kw">as</span> <span class="ident">u64</span>, <span class="self">self</span>.<span class="ident">limit</span>) <span class="kw">as</span> <span class="ident">usize</span>;
<span class="self">self</span>.<span class="ident">limit</span> <span class="op">-=</span> <span class="ident">amt</span> <span class="kw">as</span> <span class="ident">u64</span>;
<span class="self">self</span>.<span class="ident">inner</span>.<span class="ident">consume</span>(<span class="ident">amt</span>);
}
}
<span class="kw">fn</span> <span class="ident">read_one_byte</span>(<span class="ident">reader</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">Read</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">u8</span><span class="op">>></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">loop</span> {
<span class="kw">return</span> <span class="kw">match</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="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="prelude-val">Ok</span>(..) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">buf</span>[<span class="number">0</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">ErrorKind</span>::<span class="ident">Interrupted</span> <span class="op">=></span> <span class="kw">continue</span>,
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">e</span>)),
};
}
}
<span class="doccomment">/// An iterator over `u8` values of a reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This struct is generally created by calling [`bytes`] on a reader.</span>
<span class="doccomment">/// Please see the documentation of [`bytes`] for more details.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`bytes`]: trait.Read.html#method.bytes</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="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Bytes</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="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">Iterator</span> <span class="kw">for</span> <span class="ident">Bytes</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">u8</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">u8</span><span class="op">>></span> {
<span class="ident">read_one_byte</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">/// An iterator over the `char`s of a reader.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This struct is generally created by calling [`chars`][chars] on a reader.</span>
<span class="doccomment">/// Please see the documentation of `chars()` for more details.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [chars]: trait.Read.html#method.chars</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"io"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"awaiting stability of Read::chars"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"27802"</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Chars</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="doccomment">/// An enumeration of possible errors that can be generated from the `Chars`</span>
<span class="doccomment">/// adapter.</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"io"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"awaiting stability of Read::chars"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"27802"</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">CharsError</span> {
<span class="doccomment">/// Variant representing that the underlying stream was read successfully</span>
<span class="doccomment">/// but it did not contain valid utf8 data.</span>
<span class="ident">NotUtf8</span>,
<span class="doccomment">/// Variant representing that an I/O error occurred.</span>
<span class="ident">Other</span>(<span class="ident">Error</span>),
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"io"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"awaiting stability of Read::chars"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"27802"</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">Iterator</span> <span class="kw">for</span> <span class="ident">Chars</span><span class="op"><</span><span class="ident">R</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">char</span>, <span class="ident">CharsError</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">result</span>::<span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">char</span>, <span class="ident">CharsError</span><span class="op">>></span> {
<span class="kw">let</span> <span class="ident">first_byte</span> <span class="op">=</span> <span class="kw">match</span> <span class="ident">read_one_byte</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>.<span class="ident">inner</span>)<span class="question-mark">?</span> {
<span class="prelude-val">Ok</span>(<span class="ident">b</span>) <span class="op">=></span> <span class="ident">b</span>,
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">CharsError</span>::<span class="ident">Other</span>(<span class="ident">e</span>))),
};
<span class="kw">let</span> <span class="ident">width</span> <span class="op">=</span> <span class="ident">core_str</span>::<span class="ident">utf8_char_width</span>(<span class="ident">first_byte</span>);
<span class="kw">if</span> <span class="ident">width</span> <span class="op">==</span> <span class="number">1</span> { <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">first_byte</span> <span class="kw">as</span> <span class="ident">char</span>)) }
<span class="kw">if</span> <span class="ident">width</span> <span class="op">==</span> <span class="number">0</span> { <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">CharsError</span>::<span class="ident">NotUtf8</span>)) }
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> [<span class="ident">first_byte</span>, <span class="number">0</span>, <span class="number">0</span>, <span class="number">0</span>];
{
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">start</span> <span class="op">=</span> <span class="number">1</span>;
<span class="kw">while</span> <span class="ident">start</span> <span class="op"><</span> <span class="ident">width</span> {
<span class="kw">match</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="ident">buf</span>[<span class="ident">start</span>..<span class="ident">width</span>]) {
<span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">CharsError</span>::<span class="ident">NotUtf8</span>)),
<span class="prelude-val">Ok</span>(<span class="ident">n</span>) <span class="op">=></span> <span class="ident">start</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">ErrorKind</span>::<span class="ident">Interrupted</span> <span class="op">=></span> <span class="kw">continue</span>,
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="kw">return</span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">CharsError</span>::<span class="ident">Other</span>(<span class="ident">e</span>))),
}
}
}
<span class="prelude-val">Some</span>(<span class="kw">match</span> <span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="kw-2">&</span><span class="ident">buf</span>[..<span class="ident">width</span>]).<span class="ident">ok</span>() {
<span class="prelude-val">Some</span>(<span class="ident">s</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">next</span>().<span class="ident">unwrap</span>()),
<span class="prelude-val">None</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">CharsError</span>::<span class="ident">NotUtf8</span>),
})
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"io"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"awaiting stability of Read::chars"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"27802"</span>)]</span>
<span class="kw">impl</span> <span class="ident">std_error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">CharsError</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="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">CharsError</span>::<span class="ident">NotUtf8</span> <span class="op">=></span> <span class="string">"invalid utf8 encoding"</span>,
<span class="ident">CharsError</span>::<span class="ident">Other</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="op">=></span> <span class="ident">std_error</span>::<span class="ident">Error</span>::<span class="ident">description</span>(<span class="ident">e</span>),
}
}
<span class="kw">fn</span> <span class="ident">cause</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="ident">std_error</span>::<span class="ident">Error</span><span class="op">></span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">CharsError</span>::<span class="ident">NotUtf8</span> <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="ident">CharsError</span>::<span class="ident">Other</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="op">=></span> <span class="ident">e</span>.<span class="ident">cause</span>(),
}
}
}
<span class="attribute">#[<span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"io"</span>, <span class="ident">reason</span> <span class="op">=</span> <span class="string">"awaiting stability of Read::chars"</span>,
<span class="ident">issue</span> <span class="op">=</span> <span class="string">"27802"</span>)]</span>
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">CharsError</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="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="kw">match</span> <span class="kw-2">*</span><span class="self">self</span> {
<span class="ident">CharsError</span>::<span class="ident">NotUtf8</span> <span class="op">=></span> {
<span class="string">"byte stream did not contain valid utf8"</span>.<span class="ident">fmt</span>(<span class="ident">f</span>)
}
<span class="ident">CharsError</span>::<span class="ident">Other</span>(<span class="kw-2">ref</span> <span class="ident">e</span>) <span class="op">=></span> <span class="ident">e</span>.<span class="ident">fmt</span>(<span class="ident">f</span>),
}
}
}
<span class="doccomment">/// An iterator over the contents of an instance of `BufRead` split on a</span>
<span class="doccomment">/// particular byte.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This struct is generally created by calling [`split`][split] on a</span>
<span class="doccomment">/// `BufRead`. Please see the documentation of `split()` for more details.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [split]: trait.BufRead.html#method.split</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="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Split</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> {
<span class="ident">buf</span>: <span class="ident">B</span>,
<span class="ident">delim</span>: <span class="ident">u8</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">B</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Split</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">>></span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Vec</span><span class="op"><</span><span class="ident">u8</span><span class="op">>></span><span class="op">></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">match</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">read_until</span>(<span class="self">self</span>.<span class="ident">delim</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>) {
<span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="prelude-val">Ok</span>(<span class="ident">_n</span>) <span class="op">=></span> {
<span class="kw">if</span> <span class="ident">buf</span>[<span class="ident">buf</span>.<span class="ident">len</span>() <span class="op">-</span> <span class="number">1</span>] <span class="op">==</span> <span class="self">self</span>.<span class="ident">delim</span> {
<span class="ident">buf</span>.<span class="ident">pop</span>();
}
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">buf</span>))
}
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">e</span>))
}
}
}
<span class="doccomment">/// An iterator over the lines of an instance of `BufRead`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This struct is generally created by calling [`lines`][lines] on a</span>
<span class="doccomment">/// `BufRead`. Please see the documentation of `lines()` for more details.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [lines]: trait.BufRead.html#method.lines</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="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Lines</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> {
<span class="ident">buf</span>: <span class="ident">B</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">B</span>: <span class="ident">BufRead</span><span class="op">></span> <span class="ident">Iterator</span> <span class="kw">for</span> <span class="ident">Lines</span><span class="op"><</span><span class="ident">B</span><span class="op">></span> {
<span class="kw">type</span> <span class="ident">Item</span> <span class="op">=</span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">String</span><span class="op">></span>;
<span class="kw">fn</span> <span class="ident">next</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">String</span><span class="op">>></span> {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="kw">match</span> <span class="self">self</span>.<span class="ident">buf</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>) {
<span class="prelude-val">Ok</span>(<span class="number">0</span>) <span class="op">=></span> <span class="prelude-val">None</span>,
<span class="prelude-val">Ok</span>(<span class="ident">_n</span>) <span class="op">=></span> {
<span class="kw">if</span> <span class="ident">buf</span>.<span class="ident">ends_with</span>(<span class="string">"\n"</span>) {
<span class="ident">buf</span>.<span class="ident">pop</span>();
<span class="kw">if</span> <span class="ident">buf</span>.<span class="ident">ends_with</span>(<span class="string">"\r"</span>) {
<span class="ident">buf</span>.<span class="ident">pop</span>();
}
}
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="ident">buf</span>))
}
<span class="prelude-val">Err</span>(<span class="ident">e</span>) <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="prelude-val">Err</span>(<span class="ident">e</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="ident">io</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">io</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Cursor</span>;
<span class="kw">use</span> <span class="ident">test</span>;
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">repeat</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">read_until</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"12"</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="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">read_until</span>(<span class="string">b'3'</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="string">b"12"</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"1233"</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="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">read_until</span>(<span class="string">b'3'</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="string">b"123"</span>);
<span class="ident">v</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">read_until</span>(<span class="string">b'3'</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="string">b"3"</span>);
<span class="ident">v</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">read_until</span>(<span class="string">b'3'</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">0</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">split</span>() {
<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"12"</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">split</span>(<span class="string">b'3'</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">unwrap</span>(), <span class="macro">vec</span><span class="macro">!</span>[<span class="string">b'1'</span>, <span class="string">b'2'</span>]);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">next</span>().<span class="ident">is_none</span>());
<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"1233"</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">split</span>(<span class="string">b'3'</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">unwrap</span>(), <span class="macro">vec</span><span class="macro">!</span>[<span class="string">b'1'</span>, <span class="string">b'2'</span>]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">unwrap</span>(), <span class="macro">vec</span><span class="macro">!</span>[]);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</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">read_line</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"12"</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="string">"12"</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"12\n\n"</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">3</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="string">"12\n"</span>);
<span class="ident">v</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="string">"\n"</span>);
<span class="ident">v</span>.<span class="ident">truncate</span>(<span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf</span>.<span class="ident">read_line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="string">""</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">lines</span>() {
<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"12\r"</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">lines</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">unwrap</span>(), <span class="string">"12\r"</span>.<span class="ident">to_string</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">next</span>().<span class="ident">is_none</span>());
<span class="kw">let</span> <span class="ident">buf</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"12\r\n\n"</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">s</span> <span class="op">=</span> <span class="ident">buf</span>.<span class="ident">lines</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">unwrap</span>(), <span class="string">"12"</span>.<span class="ident">to_string</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">s</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>().<span class="ident">unwrap</span>(), <span class="string">""</span>.<span class="ident">to_string</span>());
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">s</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">read_to_end</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b""</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="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">read_to_end</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, []);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"1"</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="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">read_to_end</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="string">b"1"</span>);
<span class="kw">let</span> <span class="ident">cap</span> <span class="op">=</span> <span class="number">1024</span> <span class="op">*</span> <span class="number">1024</span>;
<span class="kw">let</span> <span class="ident">data</span> <span class="op">=</span> (<span class="number">0</span>..<span class="ident">cap</span>).<span class="ident">map</span>(<span class="op">|</span><span class="ident">i</span><span class="op">|</span> (<span class="ident">i</span> <span class="op">/</span> <span class="number">3</span>) <span class="kw">as</span> <span class="ident">u8</span>).<span class="ident">collect</span>::<span class="op"><</span><span class="ident">Vec</span><span class="op"><</span>_<span class="op">>></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="kw">let</span> (<span class="ident">a</span>, <span class="ident">b</span>) <span class="op">=</span> <span class="ident">data</span>.<span class="ident">split_at</span>(<span class="ident">data</span>.<span class="ident">len</span>() <span class="op">/</span> <span class="number">2</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="ident">a</span>).<span class="ident">read_to_end</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="ident">a</span>.<span class="ident">len</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="ident">b</span>).<span class="ident">read_to_end</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="ident">b</span>.<span class="ident">len</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="ident">data</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">read_to_string</span>() {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b""</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">read_to_string</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="string">""</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"1"</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">read_to_string</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">unwrap</span>(), <span class="number">1</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">v</span>, <span class="string">"1"</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"\xff"</span>[..]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">v</span> <span class="op">=</span> <span class="ident">String</span>::<span class="ident">new</span>();
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">read_to_string</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">v</span>).<span class="ident">is_err</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">read_exact</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">4</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b""</span>[..]);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</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">UnexpectedEof</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"123"</span>[..]).<span class="ident">chain</span>(<span class="ident">Cursor</span>::<span class="ident">new</span>(<span class="kw-2">&</span><span class="string">b"456789"</span>[..]));
<span class="ident">c</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">buf</span>, <span class="string">b"1234"</span>);
<span class="ident">c</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">buf</span>, <span class="string">b"5678"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</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">UnexpectedEof</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">read_exact_slice</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">4</span>];
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="kw-2">&</span><span class="string">b""</span>[..];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</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">UnexpectedEof</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="kw-2">&</span><span class="string">b"123"</span>[..];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</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">UnexpectedEof</span>);
<span class="comment">// make sure the optimized (early returning) method is being used</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">buf</span>, <span class="kw-2">&</span>[<span class="number">0</span>; <span class="number">4</span>]);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="kw-2">&</span><span class="string">b"1234"</span>[..];
<span class="ident">c</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">buf</span>, <span class="string">b"1234"</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">c</span> <span class="op">=</span> <span class="kw-2">&</span><span class="string">b"56789"</span>[..];
<span class="ident">c</span>.<span class="ident">read_exact</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">buf</span>).<span class="ident">unwrap</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">buf</span>, <span class="string">b"5678"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">c</span>, <span class="string">b"9"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">take_eof</span>() {
<span class="kw">struct</span> <span class="ident">R</span>;
<span class="kw">impl</span> <span class="ident">Read</span> <span class="kw">for</span> <span class="ident">R</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-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="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">""</span>))
}
}
<span class="kw">impl</span> <span class="ident">BufRead</span> <span class="kw">for</span> <span class="ident">R</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="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">""</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="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">1</span>];
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">0</span>, <span class="ident">R</span>.<span class="ident">take</span>(<span class="number">0</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="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b""</span>, <span class="ident">R</span>.<span class="ident">take</span>(<span class="number">0</span>).<span class="ident">fill_buf</span>().<span class="ident">unwrap</span>());
}
<span class="kw">fn</span> <span class="ident">cmp_bufread</span><span class="op"><</span><span class="ident">Br1</span>: <span class="ident">BufRead</span>, <span class="ident">Br2</span>: <span class="ident">BufRead</span><span class="op">></span>(<span class="kw-2">mut</span> <span class="ident">br1</span>: <span class="ident">Br1</span>, <span class="kw-2">mut</span> <span class="ident">br2</span>: <span class="ident">Br2</span>, <span class="ident">exp</span>: <span class="kw-2">&</span>[<span class="ident">u8</span>]) {
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">cat</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">new</span>();
<span class="kw">loop</span> {
<span class="kw">let</span> <span class="ident">consume</span> <span class="op">=</span> {
<span class="kw">let</span> <span class="ident">buf1</span> <span class="op">=</span> <span class="ident">br1</span>.<span class="ident">fill_buf</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">buf2</span> <span class="op">=</span> <span class="ident">br2</span>.<span class="ident">fill_buf</span>().<span class="ident">unwrap</span>();
<span class="kw">let</span> <span class="ident">minlen</span> <span class="op">=</span> <span class="kw">if</span> <span class="ident">buf1</span>.<span class="ident">len</span>() <span class="op"><</span> <span class="ident">buf2</span>.<span class="ident">len</span>() { <span class="ident">buf1</span>.<span class="ident">len</span>() } <span class="kw">else</span> { <span class="ident">buf2</span>.<span class="ident">len</span>() };
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">buf1</span>[..<span class="ident">minlen</span>], <span class="ident">buf2</span>[..<span class="ident">minlen</span>]);
<span class="ident">cat</span>.<span class="ident">extend_from_slice</span>(<span class="kw-2">&</span><span class="ident">buf1</span>[..<span class="ident">minlen</span>]);
<span class="ident">minlen</span>
};
<span class="kw">if</span> <span class="ident">consume</span> <span class="op">==</span> <span class="number">0</span> {
<span class="kw">break</span>;
}
<span class="ident">br1</span>.<span class="ident">consume</span>(<span class="ident">consume</span>);
<span class="ident">br2</span>.<span class="ident">consume</span>(<span class="ident">consume</span>);
}
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">br1</span>.<span class="ident">fill_buf</span>().<span class="ident">unwrap</span>().<span class="ident">len</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">br2</span>.<span class="ident">fill_buf</span>().<span class="ident">unwrap</span>().<span class="ident">len</span>(), <span class="number">0</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="kw-2">&</span><span class="ident">cat</span>[..], <span class="kw-2">&</span><span class="ident">exp</span>[..])
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">chain_bufread</span>() {
<span class="kw">let</span> <span class="ident">testdata</span> <span class="op">=</span> <span class="string">b"ABCDEFGHIJKL"</span>;
<span class="kw">let</span> <span class="ident">chain1</span> <span class="op">=</span> (<span class="kw-2">&</span><span class="ident">testdata</span>[..<span class="number">3</span>]).<span class="ident">chain</span>(<span class="kw-2">&</span><span class="ident">testdata</span>[<span class="number">3</span>..<span class="number">6</span>])
.<span class="ident">chain</span>(<span class="kw-2">&</span><span class="ident">testdata</span>[<span class="number">6</span>..<span class="number">9</span>])
.<span class="ident">chain</span>(<span class="kw-2">&</span><span class="ident">testdata</span>[<span class="number">9</span>..]);
<span class="kw">let</span> <span class="ident">chain2</span> <span class="op">=</span> (<span class="kw-2">&</span><span class="ident">testdata</span>[..<span class="number">4</span>]).<span class="ident">chain</span>(<span class="kw-2">&</span><span class="ident">testdata</span>[<span class="number">4</span>..<span class="number">8</span>])
.<span class="ident">chain</span>(<span class="kw-2">&</span><span class="ident">testdata</span>[<span class="number">8</span>..]);
<span class="ident">cmp_bufread</span>(<span class="ident">chain1</span>, <span class="ident">chain2</span>, <span class="kw-2">&</span><span class="ident">testdata</span>[..]);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">chain_zero_length_read_is_not_eof</span>() {
<span class="kw">let</span> <span class="ident">a</span> <span class="op">=</span> <span class="string">b"A"</span>;
<span class="kw">let</span> <span class="ident">b</span> <span class="op">=</span> <span class="string">b"B"</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="kw">let</span> <span class="kw-2">mut</span> <span class="ident">chain</span> <span class="op">=</span> (<span class="kw-2">&</span><span class="ident">a</span>[..]).<span class="ident">chain</span>(<span class="kw-2">&</span><span class="ident">b</span>[..]);
<span class="ident">chain</span>.<span class="ident">read</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> []).<span class="ident">unwrap</span>();
<span class="ident">chain</span>.<span class="ident">read_to_string</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="string">"AB"</span>, <span class="ident">s</span>);
}
<span class="attribute">#[<span class="ident">bench</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">bench_read_to_end</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="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lr</span> <span class="op">=</span> <span class="ident">repeat</span>(<span class="number">1</span>).<span class="ident">take</span>(<span class="number">10000000</span>);
<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">vec</span> <span class="op">=</span> <span class="ident">Vec</span>::<span class="ident">with_capacity</span>(<span class="number">1024</span>);
<span class="kw">super</span>::<span class="ident">read_to_end</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">lr</span>, <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">vec</span>)
});
}
}
</pre>
</section>
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distrib
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Mageia
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