<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta name="generator" content="rustdoc">
<meta name="description" content="API documentation for the Rust `Utf8Error` struct in crate `core`.">
<meta name="keywords" content="rust, rustlang, rust-lang, Utf8Error">
<title>core::str::Utf8Error - Rust</title>
<link rel="stylesheet" type="text/css" href="../../normalize.css">
<link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle">
<link rel="stylesheet" type="text/css" href="../../dark.css">
<link rel="stylesheet" type="text/css" href="../../main.css" id="themeStyle">
<script src="../../storage.js"></script>
<link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico">
</head>
<body class="rustdoc struct">
<!--[if lte IE 8]>
<div class="warning">
This old browser is unsupported and will most likely display funky
things.
</div>
<![endif]-->
<nav class="sidebar">
<div class="sidebar-menu">☰</div>
<a href='../../core/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a>
<p class='location'>Struct Utf8Error</p><div class="sidebar-elems"><div class="block items"><a class="sidebar-title" href="#methods">Methods</a><div class="sidebar-links"><a href="#method.valid_up_to">valid_up_to</a><a href="#method.error_len">error_len</a></div><a class="sidebar-title" href="#implementations">Trait Implementations</a><div class="sidebar-links"><a href="#impl-Copy">Copy</a><a href="#impl-Eq">Eq</a><a href="#impl-PartialEq">PartialEq</a><a href="#impl-Clone">Clone</a><a href="#impl-Debug">Debug</a><a href="#impl-Display">Display</a></div></div><p class='location'><a href='../index.html'>core</a>::<wbr><a href='index.html'>str</a></p><script>window.sidebarCurrent = {name: 'Utf8Error', ty: 'struct', relpath: ''};</script><script defer src="sidebar-items.js"></script></div>
</nav>
<div class="theme-picker">
<button id="theme-picker" aria-label="Pick another theme!">
<img src="../../brush.svg" width="18" alt="Pick another theme!">
</button>
<div id="theme-choices"></div>
</div>
<script src="../../theme.js"></script>
<nav class="sub">
<form class="search-form js-only">
<div class="search-container">
<input class="search-input" name="search"
autocomplete="off"
placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
type="search">
</div>
</form>
</nav>
<section id='main' class="content">
<h1 class='fqn'><span class='in-band'>Struct <a href='../index.html'>core</a>::<wbr><a href='index.html'>str</a>::<wbr><a class="struct" href=''>Utf8Error</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'>
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
[<span class='inner'>−</span>]
</a>
</span><a class='srclink' href='../../src/core/str/mod.rs.html#170-173' title='goto source code'>[src]</a></span></h1>
<pre class='rust struct'>pub struct Utf8Error { /* fields omitted */ }</pre><div class='docblock'><p>Errors which can occur when attempting to interpret a sequence of <a href="../../std/primitive.u8.html"><code>u8</code></a>
as a string.</p>
<p>As such, the <code>from_utf8</code> family of functions and methods for both <a href="../../std/string/struct.String.html#method.from_utf8"><code>String</code></a>s
and <a href="../../std/str/fn.from_utf8.html"><code>&str</code></a>s make use of this error, for example.</p>
</div>
<h2 id='methods' class='small-section-header'>
Methods<a href='#methods' class='anchor'></a>
</h2>
<h3 id='impl' class='impl'><span class='in-band'><code>impl <a class="struct" href="../../core/str/struct.Utf8Error.html" title="struct core::str::Utf8Error">Utf8Error</a></code><a href='#impl' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#175-217' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.valid_up_to' class="method"><span id='valid_up_to.v' class='invisible'><code>pub fn <a href='#method.valid_up_to' class='fnname'>valid_up_to</a>(&self) -> usize</code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.5.0'>1.5.0</div><a class='srclink' href='../../src/core/str/mod.rs.html#199' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns the index in the given string up to which valid UTF-8 was
verified.</p>
<p>It is the maximum index such that <code>from_utf8(&input[..index])</code>
would return <code>Ok(_)</code>.</p>
<h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1>
<p>Basic usage:</p>
<pre class="rust rust-example-rendered">
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>;
<span class="comment">// some invalid bytes, in a vector</span>
<span class="kw">let</span> <span class="ident">sparkle_heart</span> <span class="op">=</span> <span class="macro">vec</span><span class="macro">!</span>[<span class="number">0</span>, <span class="number">159</span>, <span class="number">146</span>, <span class="number">150</span>];
<span class="comment">// std::str::from_utf8 returns a Utf8Error</span>
<span class="kw">let</span> <span class="ident">error</span> <span class="op">=</span> <span class="ident">str</span>::<span class="ident">from_utf8</span>(<span class="kw-2">&</span><span class="ident">sparkle_heart</span>).<span class="ident">unwrap_err</span>();
<span class="comment">// the second byte is invalid here</span>
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="number">1</span>, <span class="ident">error</span>.<span class="ident">valid_up_to</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Astr%3B%0A%0A%2F%2F%20some%20invalid%20bytes%2C%20in%20a%20vector%0Alet%20sparkle_heart%20%3D%20vec!%5B0%2C%20159%2C%20146%2C%20150%5D%3B%0A%0A%2F%2F%20std%3A%3Astr%3A%3Afrom_utf8%20returns%20a%20Utf8Error%0Alet%20error%20%3D%20str%3A%3Afrom_utf8(%26sparkle_heart).unwrap_err()%3B%0A%0A%2F%2F%20the%20second%20byte%20is%20invalid%20here%0Aassert_eq!(1%2C%20error.valid_up_to())%3B%0A%7D">Run</a></pre>
</div><h4 id='method.error_len' class="method"><span id='error_len.v' class='invisible'><code>pub fn <a href='#method.error_len' class='fnname'>error_len</a>(&self) -> <a class="enum" href="../../core/option/enum.Option.html" title="enum core::option::Option">Option</a><usize></code></span><span class='out-of-band'><div class='ghost'></div><div class='since' title='Stable since Rust version 1.20.0'>1.20.0</div><a class='srclink' href='../../src/core/str/mod.rs.html#214-216' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Provide more information about the failure:</p>
<ul>
<li>
<p><code>None</code>: the end of the input was reached unexpectedly.
<code>self.valid_up_to()</code> is 1 to 3 bytes from the end of the input.
If a byte stream (such as a file or a network socket) is being decoded incrementally,
this could be a valid <code>char</code> whose UTF-8 byte sequence is spanning multiple chunks.</p>
</li>
<li>
<p><code>Some(len)</code>: an unexpected byte was encountered.
The length provided is that of the invalid byte sequence
that starts at the index given by <code>valid_up_to()</code>.
Decoding should resume after that sequence
(after inserting a U+FFFD REPLACEMENT CHARACTER) in case of lossy decoding.</p>
</li>
</ul>
</div></div>
<h2 id='implementations' class='small-section-header'>
Trait Implementations<a href='#implementations' class='anchor'></a>
</h2>
<h3 id='impl-Copy' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../core/marker/trait.Copy.html" title="trait core::marker::Copy">Copy</a> for <a class="struct" href="../../core/str/struct.Utf8Error.html" title="struct core::str::Utf8Error">Utf8Error</a></code><a href='#impl-Copy' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#168' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'></div><h3 id='impl-Eq' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../core/cmp/trait.Eq.html" title="trait core::cmp::Eq">Eq</a> for <a class="struct" href="../../core/str/struct.Utf8Error.html" title="struct core::str::Utf8Error">Utf8Error</a></code><a href='#impl-Eq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#168' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'></div><h3 id='impl-PartialEq' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../core/cmp/trait.PartialEq.html" title="trait core::cmp::PartialEq">PartialEq</a> for <a class="struct" href="../../core/str/struct.Utf8Error.html" title="struct core::str::Utf8Error">Utf8Error</a></code><a href='#impl-PartialEq' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#168' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.eq' class="method"><span id='eq.v' class='invisible'><code>fn <a href='../../core/cmp/trait.PartialEq.html#tymethod.eq' class='fnname'>eq</a>(&self, __arg_0: &<a class="struct" href="../../core/str/struct.Utf8Error.html" title="struct core::str::Utf8Error">Utf8Error</a>) -> bool</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#168' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>This method tests for <code>self</code> and <code>other</code> values to be equal, and is used by <code>==</code>. <a href="../../core/cmp/trait.PartialEq.html#tymethod.eq">Read more</a></p>
</div><h4 id='method.ne' class="method"><span id='ne.v' class='invisible'><code>fn <a href='../../core/cmp/trait.PartialEq.html#method.ne' class='fnname'>ne</a>(&self, __arg_0: &<a class="struct" href="../../core/str/struct.Utf8Error.html" title="struct core::str::Utf8Error">Utf8Error</a>) -> bool</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#168' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>This method tests for <code>!=</code>.</p>
</div></div><h3 id='impl-Clone' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../core/clone/trait.Clone.html" title="trait core::clone::Clone">Clone</a> for <a class="struct" href="../../core/str/struct.Utf8Error.html" title="struct core::str::Utf8Error">Utf8Error</a></code><a href='#impl-Clone' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#168' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.clone' class="method"><span id='clone.v' class='invisible'><code>fn <a href='../../core/clone/trait.Clone.html#tymethod.clone' class='fnname'>clone</a>(&self) -> <a class="struct" href="../../core/str/struct.Utf8Error.html" title="struct core::str::Utf8Error">Utf8Error</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#168' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Returns a copy of the value. <a href="../../core/clone/trait.Clone.html#tymethod.clone">Read more</a></p>
</div><h4 id='method.clone_from' class="method"><span id='clone_from.v' class='invisible'><code>fn <a href='../../core/clone/trait.Clone.html#method.clone_from' class='fnname'>clone_from</a>(&mut self, source: &Self)</code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/clone.rs.html#112-114' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Performs copy-assignment from <code>source</code>. <a href="../../core/clone/trait.Clone.html#method.clone_from">Read more</a></p>
</div></div><h3 id='impl-Debug' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../core/fmt/trait.Debug.html" title="trait core::fmt::Debug">Debug</a> for <a class="struct" href="../../core/str/struct.Utf8Error.html" title="struct core::str::Utf8Error">Utf8Error</a></code><a href='#impl-Debug' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#168' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.fmt' class="method"><span id='fmt.v' class='invisible'><code>fn <a href='../../core/fmt/trait.Debug.html#tymethod.fmt' class='fnname'>fmt</a>(&self, __arg_0: &mut <a class="struct" href="../../core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="../../core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#168' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Formats the value using the given formatter. <a href="../../core/fmt/trait.Debug.html#tymethod.fmt">Read more</a></p>
</div></div><h3 id='impl-Display' class='impl'><span class='in-band'><code>impl <a class="trait" href="../../core/fmt/trait.Display.html" title="trait core::fmt::Display">Display</a> for <a class="struct" href="../../core/str/struct.Utf8Error.html" title="struct core::str::Utf8Error">Utf8Error</a></code><a href='#impl-Display' class='anchor'></a></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#438-447' title='goto source code'>[src]</a></span></h3>
<div class='impl-items'><h4 id='method.fmt-1' class="method"><span id='fmt.v-1' class='invisible'><code>fn <a href='../../core/fmt/trait.Display.html#tymethod.fmt' class='fnname'>fmt</a>(&self, f: &mut <a class="struct" href="../../core/fmt/struct.Formatter.html" title="struct core::fmt::Formatter">Formatter</a>) -> <a class="type" href="../../core/fmt/type.Result.html" title="type core::fmt::Result">Result</a></code></span><span class='out-of-band'><div class='ghost'></div><a class='srclink' href='../../src/core/str/mod.rs.html#439-446' title='goto source code'>[src]</a></span></h4>
<div class='docblock'><p>Formats the value using the given formatter. <a href="../../core/fmt/trait.Display.html#tymethod.fmt">Read more</a></p>
</div></div></section>
<section id='search' class="content hidden"></section>
<section class="footer"></section>
<aside id="help" class="hidden">
<div>
<h1 class="hidden">Help</h1>
<div class="shortcuts">
<h2>Keyboard Shortcuts</h2>
<dl>
<dt><kbd>?</kbd></dt>
<dd>Show this help dialog</dd>
<dt><kbd>S</kbd></dt>
<dd>Focus the search field</dd>
<dt><kbd>↑</kbd></dt>
<dd>Move up in search results</dd>
<dt><kbd>↓</kbd></dt>
<dd>Move down in search results</dd>
<dt><kbd>↹</kbd></dt>
<dd>Switch tab</dd>
<dt><kbd>⏎</kbd></dt>
<dd>Go to active search result</dd>
<dt><kbd>+</kbd></dt>
<dd>Expand all sections</dd>
<dt><kbd>-</kbd></dt>
<dd>Collapse all sections</dd>
</dl>
</div>
<div class="infos">
<h2>Search Tricks</h2>
<p>
Prefix searches with a type followed by a colon (e.g.
<code>fn:</code>) to restrict the search to a given type.
</p>
<p>
Accepted types are: <code>fn</code>, <code>mod</code>,
<code>struct</code>, <code>enum</code>,
<code>trait</code>, <code>type</code>, <code>macro</code>,
and <code>const</code>.
</p>
<p>
Search functions by type signature (e.g.
<code>vec -> usize</code> or <code>* -> vec</code>)
</p>
</div>
</div>
</aside>
<script>
window.rootPath = "../../";
window.currentCrate = "core";
</script>
<script src="../../main.js"></script>
<script defer src="../../search-index.js"></script>
</body>
</html>
distrib
>
Mageia
>
6
>
x86_64
>
media
>
core-updates
>
by-pkgid
>
fdedb3cf2140df9b6d419a2338ab1caa
>
files
>
2159
