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<title>memchr</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_string_byte_memchr skin-cppreference2 action-view cpp-navbar">
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<h1 id="firstHeading" class="firstHeading">memchr</h1>
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<div id="contentSub"><span class="subpages">&lt; <a href="c.html">c</a>&lrm; | <a href="c-string.html">string</a>&lrm; | <a href="c-string-byte.html">byte</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;string.h&gt;</code></div>
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<div><span class="mw-geshi c source-c"><span class="kw4">void</span><span class="sy2">*</span> memchr<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">void</span><span class="sy2">*</span> ptr, <span class="kw4">int</span> ch, <a href="c-types-size_t.html"><span class="kw100">size_t</span></a> count <span class="br0">)</span><span class="sy4">;</span></span></div>
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<p>&#22312; <code>ptr</code> &#25152;&#25351;&#21521;&#23545;&#35937;&#30340;&#39318; <code>count</code> &#20010;&#23383;&#31526;&#65288;&#27599;&#20010;&#37117;&#36716;&#35793;&#25104; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">char</span></span></span> &#65289;&#20013;&#23547;&#25214; <code>ch</code> &#65288;&#22312;&#22914;&#21516;&#20197; <span class="t-c"><span class="mw-geshi c source-c"><span class="br0">(</span><span class="kw4">unsigned</span> <span class="kw4">char</span><span class="br0">)</span>ch</span></span> &#36716;&#25442;&#21040; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">unsigned</span> <span class="kw4">char</span></span></span> &#21518;&#65289;&#30340;&#39318;&#27425;&#20986;&#29616;&#12290;</p>
<p>&#33509;&#35775;&#38382;&#20986;&#29616;&#20110;&#34987;&#25628;&#32034;&#30340;&#25968;&#32452;&#32467;&#23614;&#21518;&#65292;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;&#33509; <code>ptr</code> &#20026;&#31354;&#25351;&#38024;&#21017;&#34892;&#20026;&#26410;&#23450;&#20041;&#12290;</p>
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<p>&#27492;&#20989;&#25968;&#34920;&#29616;&#22914;&#21516;&#23427;&#25353;&#39034;&#24207;&#35835;&#21462;&#23383;&#31526;&#65292;&#24182;&#31435;&#21363;&#20110;&#25214;&#21040;&#21305;&#37197;&#30340;&#23383;&#31526;&#26102;&#20572;&#27490;&#65306;&#33509; <code>ptr</code> &#25152;&#25351;&#21521;&#30340;&#23383;&#31526;&#25968;&#32452;&#23567;&#20110; <code>count</code> &#65292;&#20294;&#22312;&#25968;&#32452;&#20013;&#25214;&#21040;&#21305;&#37197;&#65292;&#21017;&#34892;&#20026;&#33391;&#22909;&#23450;&#20041;&#12290;</p>
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<td><span class="t-mark-rev t-since-c11">(C11 &#36215;)</span></td>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
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<td>ptr</td>
<td>-</td>
<td>&#25351;&#21521;&#35201;&#26816;&#39564;&#30340;&#23545;&#35937;&#30340;&#25351;&#38024;</td>
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<td>ch</td>
<td>-</td>
<td>&#35201;&#25628;&#32034;&#30340;&#23383;&#31526;</td>
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<td>count</td>
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<td>&#35201;&#26816;&#39564;&#30340;&#26368;&#22823;&#23383;&#31526;&#25968;</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#25351;&#21521;&#23383;&#31526;&#20301;&#32622;&#30340;&#25351;&#38024;&#65292;&#25110;&#33509;&#25214;&#19981;&#21040;&#35813;&#23383;&#31526;&#21017;&#20026;&#31354;&#25351;&#38024;&#12290;</p>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
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<pre class="de1"><span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;string.h&gt;</span>
<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
<span class="br0">{</span>
<span class="kw4">char</span> str<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> <span class="st0">&quot;ABCDEFG&quot;</span><span class="sy4">;</span>
<span class="kw4">char</span> <span class="sy2">*</span>ps <span class="sy1">=</span> memchr<span class="br0">(</span>str,<span class="st0">&#39;D&#39;</span>,<a href="c-string-byte-strlen.html"><span class="kw558">strlen</span></a><span class="br0">(</span>str<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span> <span class="br0">(</span>ps <span class="sy3">!</span><span class="sy1">=</span> <a href="c-types-NULL.html"><span class="kw103">NULL</span></a><span class="br0">)</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a> <span class="br0">(</span><span class="st0">&quot;search character found: %s<span class="es1">\n</span>&quot;</span>, ps<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">else</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a> <span class="br0">(</span><span class="st0">&quot;search character not found<span class="es1">\n</span>&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">return</span> <span class="nu0">0</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
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<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">search character found: DEFG</pre></div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">&#24341;&#29992;</span></h3>
<div class="t-ref-std-11">
<ul>
<li>C11 &#26631;&#20934;&#65288;ISO/IEC 9899:2011&#65289;&#65306;</li>
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<li>7.24.5.1 The memchr function (p: 367)</li>
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<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
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<li>7.21.5.1 The memchr function (p: 330)</li>
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<div class="t-ref-std-c89">
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<li>C89/C90 &#26631;&#20934;&#65288;ISO/IEC 9899:1990&#65289;&#65306;</li>
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<li>4.11.5.1 The memchr function</li>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
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<div class="t-dsc-member-div">
<div><a href="c-string-byte-strchr.html"><span class="t-lines"><span>strchr</span></span></a></div>
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<td>&#26597;&#25214;&#23383;&#31526;&#30340;&#39318;&#27425;&#20986;&#29616;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
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