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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `libstd/sys_common/bytestring.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>bytestring.rs.html -- source</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="../../../light.css" id="themeStyle"><script src="../../../storage.js"></script><link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">&#9776;</div><a href='../../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></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"><a id="settings-menu" href="../../../settings.html"><img src="../../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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<span class="comment">// Copyright 2014 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 &lt;LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license</span>
<span class="comment">// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, 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="attribute">#![<span class="ident">allow</span>(<span class="ident">dead_code</span>)]</span>

<span class="kw">use</span> <span class="ident">fmt</span>::{<span class="ident">Formatter</span>, <span class="prelude-ty">Result</span>, <span class="ident">Write</span>};
<span class="kw">use</span> <span class="ident">core</span>::<span class="ident">str</span>::<span class="ident">lossy</span>::{<span class="ident">Utf8Lossy</span>, <span class="ident">Utf8LossyChunk</span>};

<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">debug_fmt_bytestring</span>(<span class="ident">slice</span>: <span class="kw-2">&amp;</span>[<span class="ident">u8</span>], <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span> {
    <span class="comment">// Writes out a valid unicode string with the correct escape sequences</span>
    <span class="kw">fn</span> <span class="ident">write_str_escaped</span>(<span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>, <span class="ident">s</span>: <span class="kw-2">&amp;</span><span class="ident">str</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span> {
        <span class="kw">for</span> <span class="ident">c</span> <span class="kw">in</span> <span class="ident">s</span>.<span class="ident">chars</span>().<span class="ident">flat_map</span>(<span class="op">|</span><span class="ident">c</span><span class="op">|</span> <span class="ident">c</span>.<span class="ident">escape_debug</span>()) {
            <span class="ident">f</span>.<span class="ident">write_char</span>(<span class="ident">c</span>)<span class="question-mark">?</span>
        }
        <span class="prelude-val">Ok</span>(())
    }

    <span class="ident">f</span>.<span class="ident">write_str</span>(<span class="string">&quot;\&quot;&quot;</span>)<span class="question-mark">?</span>;
    <span class="kw">for</span> <span class="ident">Utf8LossyChunk</span> { <span class="ident">valid</span>, <span class="ident">broken</span> } <span class="kw">in</span> <span class="ident">Utf8Lossy</span>::<span class="ident">from_bytes</span>(<span class="ident">slice</span>).<span class="ident">chunks</span>() {
        <span class="ident">write_str_escaped</span>(<span class="ident">f</span>, <span class="ident">valid</span>)<span class="question-mark">?</span>;
        <span class="kw">for</span> <span class="ident">b</span> <span class="kw">in</span> <span class="ident">broken</span> {
            <span class="macro">write</span><span class="macro">!</span>(<span class="ident">f</span>, <span class="string">&quot;\\x{:02X}&quot;</span>, <span class="ident">b</span>)<span class="question-mark">?</span>;
        }
    }
    <span class="ident">f</span>.<span class="ident">write_str</span>(<span class="string">&quot;\&quot;&quot;</span>)
}

<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
    <span class="kw">use</span> <span class="kw">super</span>::<span class="kw-2">*</span>;
    <span class="kw">use</span> <span class="ident">fmt</span>::{<span class="ident">Formatter</span>, <span class="prelude-ty">Result</span>, <span class="ident">Debug</span>};

    <span class="attribute">#[<span class="ident">test</span>]</span>
    <span class="kw">fn</span> <span class="ident">smoke</span>() {
        <span class="kw">struct</span> <span class="ident">Helper</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span>(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a</span> [<span class="ident">u8</span>]);

        <span class="kw">impl</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> <span class="ident">Debug</span> <span class="kw">for</span> <span class="ident">Helper</span><span class="op">&lt;</span><span class="lifetime">&#39;a</span><span class="op">&gt;</span> {
            <span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&amp;</span><span class="self">self</span>, <span class="ident">f</span>: <span class="kw-2">&amp;</span><span class="kw-2">mut</span> <span class="ident">Formatter</span>) <span class="op">-&gt;</span> <span class="prelude-ty">Result</span> {
                <span class="ident">debug_fmt_bytestring</span>(<span class="self">self</span>.<span class="number">0</span>, <span class="ident">f</span>)
            }
        }

        <span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span>      <span class="string">b&quot;\xF0hello,\tworld&quot;</span>;
        <span class="kw">let</span> <span class="ident">expected</span> <span class="op">=</span> <span class="string">r#&quot;&quot;\xF0hello,\tworld&quot;&quot;#</span>;
        <span class="kw">let</span> <span class="ident">output</span> <span class="op">=</span> <span class="macro">format</span><span class="macro">!</span>(<span class="string">&quot;{:?}&quot;</span>, <span class="ident">Helper</span>(<span class="ident">input</span>));

        <span class="macro">assert</span><span class="macro">!</span>(<span class="ident">output</span> <span class="op">==</span> <span class="ident">expected</span>);
    }
}
</pre>
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