| <!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 of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/memchr-2.5.0/src/memchr/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../memchr/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../memchr/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| <span id="191">191</span> |
| <span id="192">192</span> |
| <span id="193">193</span> |
| <span id="194">194</span> |
| <span id="195">195</span> |
| <span id="196">196</span> |
| <span id="197">197</span> |
| <span id="198">198</span> |
| <span id="199">199</span> |
| <span id="200">200</span> |
| <span id="201">201</span> |
| <span id="202">202</span> |
| <span id="203">203</span> |
| <span id="204">204</span> |
| <span id="205">205</span> |
| <span id="206">206</span> |
| <span id="207">207</span> |
| <span id="208">208</span> |
| <span id="209">209</span> |
| <span id="210">210</span> |
| <span id="211">211</span> |
| <span id="212">212</span> |
| <span id="213">213</span> |
| <span id="214">214</span> |
| <span id="215">215</span> |
| <span id="216">216</span> |
| <span id="217">217</span> |
| <span id="218">218</span> |
| <span id="219">219</span> |
| <span id="220">220</span> |
| <span id="221">221</span> |
| <span id="222">222</span> |
| <span id="223">223</span> |
| <span id="224">224</span> |
| <span id="225">225</span> |
| <span id="226">226</span> |
| <span id="227">227</span> |
| <span id="228">228</span> |
| <span id="229">229</span> |
| <span id="230">230</span> |
| <span id="231">231</span> |
| <span id="232">232</span> |
| <span id="233">233</span> |
| <span id="234">234</span> |
| <span id="235">235</span> |
| <span id="236">236</span> |
| <span id="237">237</span> |
| <span id="238">238</span> |
| <span id="239">239</span> |
| <span id="240">240</span> |
| <span id="241">241</span> |
| <span id="242">242</span> |
| <span id="243">243</span> |
| <span id="244">244</span> |
| <span id="245">245</span> |
| <span id="246">246</span> |
| <span id="247">247</span> |
| <span id="248">248</span> |
| <span id="249">249</span> |
| <span id="250">250</span> |
| <span id="251">251</span> |
| <span id="252">252</span> |
| <span id="253">253</span> |
| <span id="254">254</span> |
| <span id="255">255</span> |
| <span id="256">256</span> |
| <span id="257">257</span> |
| <span id="258">258</span> |
| <span id="259">259</span> |
| <span id="260">260</span> |
| <span id="261">261</span> |
| <span id="262">262</span> |
| <span id="263">263</span> |
| <span id="264">264</span> |
| <span id="265">265</span> |
| <span id="266">266</span> |
| <span id="267">267</span> |
| <span id="268">268</span> |
| <span id="269">269</span> |
| <span id="270">270</span> |
| <span id="271">271</span> |
| <span id="272">272</span> |
| <span id="273">273</span> |
| <span id="274">274</span> |
| <span id="275">275</span> |
| <span id="276">276</span> |
| <span id="277">277</span> |
| <span id="278">278</span> |
| <span id="279">279</span> |
| <span id="280">280</span> |
| <span id="281">281</span> |
| <span id="282">282</span> |
| <span id="283">283</span> |
| <span id="284">284</span> |
| <span id="285">285</span> |
| <span id="286">286</span> |
| <span id="287">287</span> |
| <span id="288">288</span> |
| <span id="289">289</span> |
| <span id="290">290</span> |
| <span id="291">291</span> |
| <span id="292">292</span> |
| <span id="293">293</span> |
| <span id="294">294</span> |
| <span id="295">295</span> |
| <span id="296">296</span> |
| <span id="297">297</span> |
| <span id="298">298</span> |
| <span id="299">299</span> |
| <span id="300">300</span> |
| <span id="301">301</span> |
| <span id="302">302</span> |
| <span id="303">303</span> |
| <span id="304">304</span> |
| <span id="305">305</span> |
| <span id="306">306</span> |
| <span id="307">307</span> |
| <span id="308">308</span> |
| <span id="309">309</span> |
| <span id="310">310</span> |
| <span id="311">311</span> |
| <span id="312">312</span> |
| <span id="313">313</span> |
| <span id="314">314</span> |
| <span id="315">315</span> |
| <span id="316">316</span> |
| <span id="317">317</span> |
| <span id="318">318</span> |
| <span id="319">319</span> |
| <span id="320">320</span> |
| <span id="321">321</span> |
| <span id="322">322</span> |
| <span id="323">323</span> |
| <span id="324">324</span> |
| <span id="325">325</span> |
| <span id="326">326</span> |
| <span id="327">327</span> |
| <span id="328">328</span> |
| <span id="329">329</span> |
| <span id="330">330</span> |
| <span id="331">331</span> |
| <span id="332">332</span> |
| <span id="333">333</span> |
| <span id="334">334</span> |
| <span id="335">335</span> |
| <span id="336">336</span> |
| <span id="337">337</span> |
| <span id="338">338</span> |
| <span id="339">339</span> |
| <span id="340">340</span> |
| <span id="341">341</span> |
| <span id="342">342</span> |
| <span id="343">343</span> |
| <span id="344">344</span> |
| <span id="345">345</span> |
| <span id="346">346</span> |
| <span id="347">347</span> |
| <span id="348">348</span> |
| <span id="349">349</span> |
| <span id="350">350</span> |
| <span id="351">351</span> |
| <span id="352">352</span> |
| <span id="353">353</span> |
| <span id="354">354</span> |
| <span id="355">355</span> |
| <span id="356">356</span> |
| <span id="357">357</span> |
| <span id="358">358</span> |
| <span id="359">359</span> |
| <span id="360">360</span> |
| <span id="361">361</span> |
| <span id="362">362</span> |
| <span id="363">363</span> |
| <span id="364">364</span> |
| <span id="365">365</span> |
| <span id="366">366</span> |
| <span id="367">367</span> |
| <span id="368">368</span> |
| <span id="369">369</span> |
| <span id="370">370</span> |
| <span id="371">371</span> |
| <span id="372">372</span> |
| <span id="373">373</span> |
| <span id="374">374</span> |
| <span id="375">375</span> |
| <span id="376">376</span> |
| <span id="377">377</span> |
| <span id="378">378</span> |
| <span id="379">379</span> |
| <span id="380">380</span> |
| <span id="381">381</span> |
| <span id="382">382</span> |
| <span id="383">383</span> |
| <span id="384">384</span> |
| <span id="385">385</span> |
| <span id="386">386</span> |
| <span id="387">387</span> |
| <span id="388">388</span> |
| <span id="389">389</span> |
| <span id="390">390</span> |
| <span id="391">391</span> |
| <span id="392">392</span> |
| <span id="393">393</span> |
| <span id="394">394</span> |
| <span id="395">395</span> |
| <span id="396">396</span> |
| <span id="397">397</span> |
| <span id="398">398</span> |
| <span id="399">399</span> |
| <span id="400">400</span> |
| <span id="401">401</span> |
| <span id="402">402</span> |
| <span id="403">403</span> |
| <span id="404">404</span> |
| <span id="405">405</span> |
| <span id="406">406</span> |
| <span id="407">407</span> |
| <span id="408">408</span> |
| <span id="409">409</span> |
| <span id="410">410</span> |
| </pre><pre class="rust"><code><span class="kw">use </span>core::iter::Rev; |
| |
| <span class="kw">pub use </span><span class="self">self</span>::iter::{Memchr, Memchr2, Memchr3}; |
| |
| <span class="comment">// N.B. If you're looking for the cfg knobs for libc, see build.rs. |
| </span><span class="attribute">#[cfg(memchr_libc)] |
| </span><span class="kw">mod </span>c; |
| <span class="attribute">#[allow(dead_code)] |
| </span><span class="kw">pub mod </span>fallback; |
| <span class="kw">mod </span>iter; |
| <span class="kw">pub mod </span>naive; |
| <span class="attribute">#[cfg(all(not(miri), target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd))] |
| </span><span class="kw">mod </span>x86; |
| |
| <span class="doccomment">/// An iterator over all occurrences of the needle in a haystack. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memchr_iter(needle: u8, haystack: <span class="kw-2">&</span>[u8]) -> Memchr<<span class="lifetime">'_</span>> { |
| Memchr::new(needle, haystack) |
| } |
| |
| <span class="doccomment">/// An iterator over all occurrences of the needles in a haystack. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memchr2_iter(needle1: u8, needle2: u8, haystack: <span class="kw-2">&</span>[u8]) -> Memchr2<<span class="lifetime">'_</span>> { |
| Memchr2::new(needle1, needle2, haystack) |
| } |
| |
| <span class="doccomment">/// An iterator over all occurrences of the needles in a haystack. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memchr3_iter( |
| needle1: u8, |
| needle2: u8, |
| needle3: u8, |
| haystack: <span class="kw-2">&</span>[u8], |
| ) -> Memchr3<<span class="lifetime">'_</span>> { |
| Memchr3::new(needle1, needle2, needle3, haystack) |
| } |
| |
| <span class="doccomment">/// An iterator over all occurrences of the needle in a haystack, in reverse. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memrchr_iter(needle: u8, haystack: <span class="kw-2">&</span>[u8]) -> Rev<Memchr<<span class="lifetime">'_</span>>> { |
| Memchr::new(needle, haystack).rev() |
| } |
| |
| <span class="doccomment">/// An iterator over all occurrences of the needles in a haystack, in reverse. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memrchr2_iter( |
| needle1: u8, |
| needle2: u8, |
| haystack: <span class="kw-2">&</span>[u8], |
| ) -> Rev<Memchr2<<span class="lifetime">'_</span>>> { |
| Memchr2::new(needle1, needle2, haystack).rev() |
| } |
| |
| <span class="doccomment">/// An iterator over all occurrences of the needles in a haystack, in reverse. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memrchr3_iter( |
| needle1: u8, |
| needle2: u8, |
| needle3: u8, |
| haystack: <span class="kw-2">&</span>[u8], |
| ) -> Rev<Memchr3<<span class="lifetime">'_</span>>> { |
| Memchr3::new(needle1, needle2, needle3, haystack).rev() |
| } |
| |
| <span class="doccomment">/// Search for the first occurrence of a byte in a slice. |
| /// |
| /// This returns the index corresponding to the first occurrence of `needle` in |
| /// `haystack`, or `None` if one is not found. If an index is returned, it is |
| /// guaranteed to be less than `usize::MAX`. |
| /// |
| /// While this is operationally the same as something like |
| /// `haystack.iter().position(|&b| b == needle)`, `memchr` will use a highly |
| /// optimized routine that can be up to an order of magnitude faster in some |
| /// cases. |
| /// |
| /// # Example |
| /// |
| /// This shows how to find the first position of a byte in a byte string. |
| /// |
| /// ``` |
| /// use memchr::memchr; |
| /// |
| /// let haystack = b"the quick brown fox"; |
| /// assert_eq!(memchr(b'k', haystack), Some(8)); |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memchr(needle: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="attribute">#[cfg(miri)] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| naive::memchr(n1, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd, not(miri)))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| x86::memchr(n1, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all( |
| memchr_libc, |
| not(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd)), |
| not(miri), |
| ))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| c::memchr(n1, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all( |
| not(memchr_libc), |
| not(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd)), |
| not(miri), |
| ))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| fallback::memchr(n1, haystack) |
| } |
| |
| <span class="kw">if </span>haystack.is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| imp(needle, haystack) |
| } |
| } |
| |
| <span class="doccomment">/// Like `memchr`, but searches for either of two bytes instead of just one. |
| /// |
| /// This returns the index corresponding to the first occurrence of `needle1` |
| /// or the first occurrence of `needle2` in `haystack` (whichever occurs |
| /// earlier), or `None` if neither one is found. If an index is returned, it is |
| /// guaranteed to be less than `usize::MAX`. |
| /// |
| /// While this is operationally the same as something like |
| /// `haystack.iter().position(|&b| b == needle1 || b == needle2)`, `memchr2` |
| /// will use a highly optimized routine that can be up to an order of magnitude |
| /// faster in some cases. |
| /// |
| /// # Example |
| /// |
| /// This shows how to find the first position of either of two bytes in a byte |
| /// string. |
| /// |
| /// ``` |
| /// use memchr::memchr2; |
| /// |
| /// let haystack = b"the quick brown fox"; |
| /// assert_eq!(memchr2(b'k', b'q', haystack), Some(4)); |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memchr2(needle1: u8, needle2: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="attribute">#[cfg(miri)] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| naive::memchr2(n1, n2, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd, not(miri)))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| x86::memchr2(n1, n2, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all( |
| not(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd)), |
| not(miri), |
| ))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| fallback::memchr2(n1, n2, haystack) |
| } |
| |
| <span class="kw">if </span>haystack.is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| imp(needle1, needle2, haystack) |
| } |
| } |
| |
| <span class="doccomment">/// Like `memchr`, but searches for any of three bytes instead of just one. |
| /// |
| /// This returns the index corresponding to the first occurrence of `needle1`, |
| /// the first occurrence of `needle2`, or the first occurrence of `needle3` in |
| /// `haystack` (whichever occurs earliest), or `None` if none are found. If an |
| /// index is returned, it is guaranteed to be less than `usize::MAX`. |
| /// |
| /// While this is operationally the same as something like |
| /// `haystack.iter().position(|&b| b == needle1 || b == needle2 || |
| /// b == needle3)`, `memchr3` will use a highly optimized routine that can be |
| /// up to an order of magnitude faster in some cases. |
| /// |
| /// # Example |
| /// |
| /// This shows how to find the first position of any of three bytes in a byte |
| /// string. |
| /// |
| /// ``` |
| /// use memchr::memchr3; |
| /// |
| /// let haystack = b"the quick brown fox"; |
| /// assert_eq!(memchr3(b'k', b'q', b'e', haystack), Some(2)); |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memchr3( |
| needle1: u8, |
| needle2: u8, |
| needle3: u8, |
| haystack: <span class="kw-2">&</span>[u8], |
| ) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="attribute">#[cfg(miri)] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, n3: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| naive::memchr3(n1, n2, n3, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd, not(miri)))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, n3: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| x86::memchr3(n1, n2, n3, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all( |
| not(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd)), |
| not(miri), |
| ))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, n3: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| fallback::memchr3(n1, n2, n3, haystack) |
| } |
| |
| <span class="kw">if </span>haystack.is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| imp(needle1, needle2, needle3, haystack) |
| } |
| } |
| |
| <span class="doccomment">/// Search for the last occurrence of a byte in a slice. |
| /// |
| /// This returns the index corresponding to the last occurrence of `needle` in |
| /// `haystack`, or `None` if one is not found. If an index is returned, it is |
| /// guaranteed to be less than `usize::MAX`. |
| /// |
| /// While this is operationally the same as something like |
| /// `haystack.iter().rposition(|&b| b == needle)`, `memrchr` will use a highly |
| /// optimized routine that can be up to an order of magnitude faster in some |
| /// cases. |
| /// |
| /// # Example |
| /// |
| /// This shows how to find the last position of a byte in a byte string. |
| /// |
| /// ``` |
| /// use memchr::memrchr; |
| /// |
| /// let haystack = b"the quick brown fox"; |
| /// assert_eq!(memrchr(b'o', haystack), Some(17)); |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memrchr(needle: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="attribute">#[cfg(miri)] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| naive::memrchr(n1, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd, not(miri)))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| x86::memrchr(n1, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all( |
| memchr_libc, |
| target_os = <span class="string">"linux"</span>, |
| not(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd)), |
| not(miri) |
| ))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| c::memrchr(n1, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all( |
| not(all(memchr_libc, target_os = <span class="string">"linux"</span>)), |
| not(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd)), |
| not(miri), |
| ))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| fallback::memrchr(n1, haystack) |
| } |
| |
| <span class="kw">if </span>haystack.is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| imp(needle, haystack) |
| } |
| } |
| |
| <span class="doccomment">/// Like `memrchr`, but searches for either of two bytes instead of just one. |
| /// |
| /// This returns the index corresponding to the last occurrence of `needle1` or |
| /// the last occurrence of `needle2` in `haystack` (whichever occurs later), or |
| /// `None` if neither one is found. If an index is returned, it is guaranteed |
| /// to be less than `usize::MAX`. |
| /// |
| /// While this is operationally the same as something like |
| /// `haystack.iter().rposition(|&b| b == needle1 || b == needle2)`, `memrchr2` |
| /// will use a highly optimized routine that can be up to an order of magnitude |
| /// faster in some cases. |
| /// |
| /// # Example |
| /// |
| /// This shows how to find the last position of either of two bytes in a byte |
| /// string. |
| /// |
| /// ``` |
| /// use memchr::memrchr2; |
| /// |
| /// let haystack = b"the quick brown fox"; |
| /// assert_eq!(memrchr2(b'k', b'q', haystack), Some(8)); |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memrchr2(needle1: u8, needle2: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="attribute">#[cfg(miri)] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| naive::memrchr2(n1, n2, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd, not(miri)))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| x86::memrchr2(n1, n2, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all( |
| not(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd)), |
| not(miri), |
| ))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| fallback::memrchr2(n1, n2, haystack) |
| } |
| |
| <span class="kw">if </span>haystack.is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| imp(needle1, needle2, haystack) |
| } |
| } |
| |
| <span class="doccomment">/// Like `memrchr`, but searches for any of three bytes instead of just one. |
| /// |
| /// This returns the index corresponding to the last occurrence of `needle1`, |
| /// the last occurrence of `needle2`, or the last occurrence of `needle3` in |
| /// `haystack` (whichever occurs later), or `None` if none are found. If an |
| /// index is returned, it is guaranteed to be less than `usize::MAX`. |
| /// |
| /// While this is operationally the same as something like |
| /// `haystack.iter().rposition(|&b| b == needle1 || b == needle2 || |
| /// b == needle3)`, `memrchr3` will use a highly optimized routine that can be |
| /// up to an order of magnitude faster in some cases. |
| /// |
| /// # Example |
| /// |
| /// This shows how to find the last position of any of three bytes in a byte |
| /// string. |
| /// |
| /// ``` |
| /// use memchr::memrchr3; |
| /// |
| /// let haystack = b"the quick brown fox"; |
| /// assert_eq!(memrchr3(b'k', b'q', b'e', haystack), Some(8)); |
| /// ``` |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>memrchr3( |
| needle1: u8, |
| needle2: u8, |
| needle3: u8, |
| haystack: <span class="kw-2">&</span>[u8], |
| ) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="attribute">#[cfg(miri)] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, n3: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| naive::memrchr3(n1, n2, n3, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd, not(miri)))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, n3: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| x86::memrchr3(n1, n2, n3, haystack) |
| } |
| |
| <span class="attribute">#[cfg(all( |
| not(all(target_arch = <span class="string">"x86_64"</span>, memchr_runtime_simd)), |
| not(miri), |
| ))] |
| #[inline(always)] |
| </span><span class="kw">fn </span>imp(n1: u8, n2: u8, n3: u8, haystack: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><usize> { |
| fallback::memrchr3(n1, n2, n3, haystack) |
| } |
| |
| <span class="kw">if </span>haystack.is_empty() { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| imp(needle1, needle2, needle3, haystack) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="memchr" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |