klarkxy/hustoj
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

上传cppreference

Browse Source
This commit is contained in:
klarkxy
2025-08-01 12:57:54 +08:00
parent e29892f8cd
commit 196e706fe4
5485 changed files with 982007 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

169
web/cppreference-zh/chmhelp/c-string-multibyte-mbrlen.html Normal file
View File

@@ -0,0 +1,169 @@
<!DOCTYPE html>
<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
<head><meta http-equiv="x-ua-compatible" content="ie=edge">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>mbrlen</title>
<link rel="stylesheet" href="ext.css" />
<link rel="stylesheet" href="site_modules.css" />
</head>
<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_string_multibyte_mbrlen skin-cppreference2 action-view cpp-navbar">
<div id="cpp-content-base">
<div id="content"><a id="top"></a>
<h1 id="firstHeading" class="firstHeading">mbrlen</h1>
<div id="bodyContent">
<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-multibyte.html">multibyte</a></span></div>
<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
<table class="t-dcl-begin">
<tbody>
<tr class="t-dsc-header">
<td>
<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;wchar.h&gt;</code></div>
</td>
<td></td>
<td></td>
</tr>
<tr class="t-dcl t-since-c95 t-until-c99">
<td>
<div><span class="mw-geshi c source-c"><a href="c-types-size_t.html"><span class="kw100">size_t</span></a> mbrlen<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span>s, <a href="c-types-size_t.html"><span class="kw100">size_t</span></a> n, <a href="c-string-multibyte-mbstate_t.html"><span class="kw591">mbstate_t</span></a> <span class="sy2">*</span>ps <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-c95">(C95 &#36215;)</span><br />
<span class="t-mark-rev t-until-c99">(C99 &#21069;)</span></td>
</tr>
<tr class="t-dcl t-since-c99">
<td>
<div><span class="mw-geshi c source-c"><a href="c-types-size_t.html"><span class="kw100">size_t</span></a> mbrlen<span class="br0">(</span> <span class="kw4">const</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> s, <a href="c-types-size_t.html"><span class="kw100">size_t</span></a> n, <a href="c-string-multibyte-mbstate_t.html"><span class="kw591">mbstate_t</span></a> <span class="sy2">*</span><span class="kw4">restrict</span> ps <span class="br0">)</span><span class="sy4">;</span></span></div>
</td>
<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
</tr>
<tr class="t-dcl-sep">
<td></td>
<td></td>
<td></td>
</tr>
</tbody>
</table>
<p>&#32473;&#23450;&#24403;&#21069;&#36716;&#25442;&#29366;&#24577; <code>ps</code> &#65292;&#30830;&#23450; <code>s</code> &#25152;&#25351;&#21521;&#30340;&#21097;&#20313;&#22810;&#23383;&#33410;&#23383;&#31526;&#30340;&#23383;&#33410;&#22823;&#23567;&#12290;</p>
<p>&#27492;&#20989;&#25968;&#31561;&#20215;&#20110;&#23545;&#20110;&#26576;&#20010;&#38544;&#34255;&#30340; <span class="t-lc"><a href="c-string-multibyte-mbstate_t.html">mbstate_t</a></span> &#31867;&#22411;&#23545;&#35937; <code>internal</code> &#35843;&#29992; <span class="t-c"><span class="mw-geshi c source-c"><a href="c-string-multibyte-mbrtowc.html"><span class="kw583">mbrtowc</span></a><span class="br0">(</span><a href="c-types-NULL.html"><span class="kw103">NULL</span></a>, s, n, ps<span class="sy4">?</span>ps<span class="sy4">:</span><span class="sy3">&amp;</span>internal<span class="br0">)</span></span></span> &#65292;&#38500;&#20102;&#21482;&#27714;&#20540; <code>ps</code> &#19968;&#27425;&#12290;</p>
<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">&#21442;&#25968;</span></h3>
<table class="t-par-begin">
<tr class="t-par">
<td>s</td>
<td>-</td>
<td>&#25351;&#21521;&#22810;&#23383;&#33410;&#23383;&#31526;&#20018;&#39318;&#20803;&#32032;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>n</td>
<td>-</td>
<td>s &#20013;&#33021;&#26816;&#39564;&#30340;&#23383;&#33410;&#25968;&#38480;&#21046;</td>
</tr>
<tr class="t-par">
<td>ps</td>
<td>-</td>
<td>&#25351;&#21521;&#20445;&#26377;&#36716;&#25442;&#29366;&#24577;&#30340;&#23545;&#35937;&#30340;&#25351;&#38024;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<p>&#24212;&#29992;&#19979;&#20010;&#39318;&#20010;&#21487;&#29992;&#32773;&#65306;</p>
<ul>
<li><span class="t-c"><span class="mw-geshi c source-c">&#8203;<span class="nu0">0</span>&#8203;</span></span> &#65292;&#33509;&#25509;&#19979;&#26469; <code>n</code> &#20010;&#25110;&#26356;&#23569;&#23383;&#33410;&#32452;&#25104;&#31354;&#23383;&#31526;&#65292;&#25110; <code>s</code> &#20026;&#31354;&#25351;&#38024;&#12290;&#20004;&#31181;&#24773;&#20917;&#19979;&#37117;&#37325;&#32622;&#36716;&#25442;&#29366;&#24577;&#12290;</li>
<li>&#23383;&#33410;&#25968; <span class="t-c"><span class="mw-geshi c source-c"><span class="br0">[</span><span class="nu0">1</span>...<span class="me1">n</span><span class="br0">]</span></span></span> &#65292;&#36825;&#20123;&#23383;&#33410;&#32452;&#25104;&#21512;&#27861;&#30340;&#22810;&#23383;&#33410;&#23383;&#31526;&#12290;</li>
<li><span class="t-c"><span class="mw-geshi c source-c"><span class="br0">(</span><a href="c-types-size_t.html"><span class="kw100">size_t</span></a><span class="br0">)</span><span class="sy2">-</span><span class="nu0">2</span></span></span> &#65292;&#33509;&#25509;&#19979;&#26469; <code>n</code> &#20010;&#23383;&#33410;&#26159;&#21487;&#33021;&#21512;&#27861;&#30340;&#22810;&#23383;&#33410;&#23383;&#31526;&#30340;&#19968;&#37096;&#20998;&#65292;&#20294;&#22312;&#26816;&#39564;&#25152;&#26377; <code>n</code> &#20010;&#23383;&#33410;&#21518;&#20173;&#19981;&#23436;&#25972;</li>
<li><span class="t-c"><span class="mw-geshi c source-c"><span class="br0">(</span><a href="c-types-size_t.html"><span class="kw100">size_t</span></a><span class="br0">)</span><span class="sy2">-</span><span class="nu0">1</span></span></span> &#65292;&#33509;&#20986;&#29616;&#32534;&#30721;&#38169;&#35823;&#12290;&#35774;&#32622; <span class="t-lc"><a href="c-error-errno.html">errno</a></span> &#30340;&#20540;&#20026; <code>EILSEQ</code> &#65307;&#36716;&#25442;&#29366;&#24577;&#26410;&#25351;&#23450;&#12290;</li>
</ul>
<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">&#31034;&#20363;</span></h3>
<div class="t-example">
<div class="t-example-live-link"></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="c source-c">
<pre class="de1"><span class="co2">#include &lt;locale.h&gt;</span>
<span class="co2">#include &lt;string.h&gt;</span>
<span class="co2">#include &lt;stdio.h&gt;</span>
<span class="co2">#include &lt;wchar.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="co1">// &#20801;&#35768; mbrlen() &#20197; UTF-8 &#22810;&#23383;&#33410;&#32534;&#30721;&#24037;&#20316;</span>
<a href="c-locale-setlocale.html"><span class="kw900">setlocale</span></a><span class="br0">(</span><a href="c-locale-LC_categories.html"><span class="kw903">LC_ALL</span></a>, <span class="st0">&quot;en_US.utf8&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="co1">// UTF-8 &#31364;&#22810;&#23383;&#33410;&#32534;&#30721;</span>
<span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> str <span class="sy1">=</span> u8<span class="st0">&quot;&#27700;&quot;</span><span class="sy4">;</span>
<a href="c-types-size_t.html"><span class="kw100">size_t</span></a> sz <span class="sy1">=</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="sy4">;</span>
<a href="c-string-multibyte-mbstate_t.html"><span class="kw591">mbstate_t</span></a> mb<span class="sy4">;</span>
<a href="c-string-byte-memset.html"><span class="kw571">memset</span></a><span class="br0">(</span><span class="sy3">&amp;</span>mb, <span class="nu0">0</span>, <span class="kw4">sizeof</span> mb<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">int</span> len1 <span class="sy1">=</span> mbrlen<span class="br0">(</span>str, <span class="nu0">1</span>, <span class="sy3">&amp;</span>mb<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span>len1 <span class="sy1">==</span> <span class="sy2">-</span><span class="nu0">2</span><span class="br0">)</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;The first 1 byte of %s is an incomplete multibyte char&quot;</span>
<span class="st0">&quot; (mbrlen returns -2)<span class="es1">\n</span>&quot;</span>, str<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">int</span> len2 <span class="sy1">=</span> mbrlen<span class="br0">(</span>str<span class="sy2">+</span><span class="nu0">1</span>, sz<span class="sy2">-</span><span class="nu0">1</span>, <span class="sy3">&amp;</span>mb<span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;The remaining %zu bytes of %s hold %d bytes of the multibyte&quot;</span>
<span class="st0">&quot; character<span class="es1">\n</span>&quot;</span>, sz<span class="sy2">-</span><span class="nu0">1</span>, str, len2<span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;Attempting to call mbrlen() in the middle of %s while in initial&quot;</span>
<span class="st0">&quot; shift state returns %zd<span class="es1">\n</span>&quot;</span>, str, mbrlen<span class="br0">(</span>str<span class="sy2">+</span><span class="nu0">1</span>, sz<span class="sy2">-</span><span class="nu0">1</span>, <span class="sy3">&amp;</span>mb<span class="br0">)</span><span class="br0">)</span><span class="sy4">;</span>
<span class="br0">}</span></pre></div>
</div>
<p>&#36755;&#20986;&#65306;</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;">
<div class="text source-text">
<pre class="de1">The first 1 byte of &#27700; is an incomplete multibyte char (mbrlen returns -2)
The remaining 2 bytes of &#27700; hold 2 bytes of the multibyte character
Attempting to call mbrlen() in the middle of &#27700; while in initial shift state returns -1</pre></div>
</div>
</div>
<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>
</ul>
<dl>
<dd>
<ul>
<li>7.29.6.3.1 The mbrlen function (p: 442)</li>
</ul>
</dd>
</dl>
<div class="t-ref-std-c99">
<ul>
<li>C99 &#26631;&#20934;&#65288;ISO/IEC 9899:1999&#65289;&#65306;</li>
</ul>
<dl>
<dd>
<ul>
<li>7.24.6.3.1 The mbrlen function (p: 388)</li>
</ul>
</dd>
</dl>
</div>
<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">&#21442;&#38405;</span></h3>
<table class="t-dsc-begin">
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-string-multibyte-mbrtowc.html"><span class="t-lines"><span>mbrtowc</span></span></a></div>
<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div>
</div>
</td>
<td>&#32473;&#23450;&#29366;&#24577;&#65292;&#23558;&#19979;&#19968;&#20010;&#22810;&#23383;&#33410;&#23383;&#31526;&#36716;&#25442;&#25104;&#23485;&#23383;&#31526;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
<tr class="t-dsc">
<td>
<div class="t-dsc-member-div">
<div><a href="c-string-multibyte-mblen.html"><span class="t-lines"><span>mblen</span></span></a></div>
</div>
</td>
<td>&#36820;&#22238;&#19979;&#19968;&#20010;&#22810;&#23383;&#33410;&#23383;&#31526;&#30340;&#23383;&#33410;&#25968;<br />
<span class="t-mark">(&#20989;&#25968;)</span></td>
</tr>
</table>
</div>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
</body>
</html>