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<title>wcrtomb, wcrtomb_s</title>
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<h1 id="firstHeading" class="firstHeading">wcrtomb, wcrtomb_s</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-multibyte.html">multibyte</a></span></div>
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<div>&#23450;&#20041;&#20110;&#22836;&#25991;&#20214; <code>&lt;wchar.h&gt;</code></div>
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<td rowspan="142">(1)</td>
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<div><span class="mw-geshi c source-c"><a href="c-types-size_t.html"><span class="kw100">size_t</span></a> wcrtomb<span class="br0">(</span> <span class="kw4">char</span> <span class="sy2">*</span>s, <span class="kw4">wchar_t</span> wc, <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>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-c95">(C95 &#36215;)</span></td>
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<td>
<div><span class="mw-geshi c source-c"><a href="c-types-size_t.html"><span class="kw100">size_t</span></a> wcrtomb<span class="br0">(</span> <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> s, <span class="kw4">wchar_t</span> wc, <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>
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<td class="t-dcl-nopad"></td>
<td><span class="t-mark-rev t-since-c99">(C99 &#36215;)</span></td>
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</tbody>
<tbody>
<tr class="t-dcl t-since-c11">
<td>
<div><span class="mw-geshi c source-c">errno_t wcrtomb_s<span class="br0">(</span><a href="c-types-size_t.html"><span class="kw100">size_t</span></a> <span class="sy2">*</span><span class="kw4">restrict</span> retval, <span class="kw4">char</span> <span class="sy2">*</span><span class="kw4">restrict</span> s, rsize_t ssz,<br />
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; <span class="kw4">wchar_t</span> wc, <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>
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<td>(2)</td>
<td><span class="t-mark-rev t-since-c11">(C11 &#36215;)</span></td>
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<p>&#36716;&#25442;&#23485;&#23383;&#31526;&#20026;&#20854;&#31364;&#22810;&#23383;&#33410;&#34920;&#31034;&#12290;</p>
<div class="t-li1"><span class="t-li">1)</span> &#33509; <code>s</code> &#19981;&#26159;&#31354;&#25351;&#38024;&#65292;&#21017;&#20989;&#25968;&#26816;&#27979;&#23384;&#20648; <code>wc</code> &#30340;&#22810;&#23383;&#33410;&#23383;&#31526;&#34920;&#31034;&#25152;&#38656;&#30340;&#23383;&#33410;&#25968;&#65288;&#21253;&#21547;&#20219;&#20309;&#36801;&#31227;&#24207;&#21015;&#65292;&#24182;&#32771;&#34385;&#24403;&#21069;&#22810;&#23383;&#33410;&#36716;&#25442;&#29366;&#24577; <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>ps</span></span> &#65292;&#24182;&#23384;&#20648;&#22810;&#23383;&#33410;&#23383;&#31526;&#34920;&#31034;&#20110;&#39318;&#20803;&#32032;&#20026; <code>s</code> &#25152;&#25351;&#21521;&#30340;&#23383;&#31526;&#25968;&#32452;&#65292;&#25353;&#38656;&#26356;&#26032; <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>ps</span></span> &#12290;&#27492;&#20989;&#25968;&#33267;&#22810;&#33021;&#20889;&#20837; <span class="t-c"><span class="mw-geshi c source-c">MB_CUR_MAX</span></span> &#23383;&#33410;&#12290;</div>
<div class="t-li1"><span class="t-li"></span> &#33509; <code>s</code> &#20026;&#31354;&#25351;&#38024;&#65292;&#21017;&#35843;&#29992;&#31561;&#20215;&#20110;&#23545;&#26576;&#20869;&#37096;&#32531;&#20914;&#21306; <code>buf</code> &#30340; <span class="t-c"><span class="mw-geshi c source-c">wcrtomb<span class="br0">(</span>buf, L<span class="st0">&#39;<span class="es5">\0</span>&#39;</span>, ps<span class="br0">)</span></span></span> &#12290;</div>
<div class="t-li1"><span class="t-li"></span> &#33509; wc &#26159;&#31354;&#23485;&#23383;&#31526; <span class="t-c"><span class="mw-geshi c source-c">L<span class="st0">&#39;<span class="es5">\0</span>&#39;</span></span></span> &#65292;&#21017;&#23384;&#20648;&#31354;&#23383;&#33410;&#65292;&#21069;&#25509;&#20219;&#20309;&#24674;&#22797;&#21040;&#21021;&#22987;&#36801;&#31227;&#29366;&#24577;&#25152;&#38656;&#30340;&#36801;&#31227;&#24207;&#21015;&#65292;&#24182;&#26356;&#26032;&#36716;&#25442;&#29366;&#24577;&#21442;&#25968; <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>ps</span></span> &#20197;&#34920;&#31034;&#20854;&#21021;&#22987;&#36801;&#31227;&#29366;&#24577;&#12290;</div>
<div class="t-li1"><span class="t-li"></span> &#33509;&#23450;&#20041;&#29615;&#22659;&#23439; <span class="t-c"><span class="mw-geshi c source-c">__STDC_ISO_10646__</span></span> &#65292;&#21017; <span class="t-c"><span class="mw-geshi c source-c"><span class="kw4">wchar_t</span></span></span> &#31867;&#22411;&#30340;&#20540;&#19982; Unicode &#35201;&#27714;&#38598;&#65288;&#20856;&#22411;&#22320;&#20026; UTF-32 &#32534;&#30721;&#65289;&#20013;&#23383;&#31526;&#30340;&#30701;&#26631;&#35782;&#31526;&#30456;&#21516;&#65307;&#21542;&#21017;&#23427;&#26159;&#23454;&#29616;&#23450;&#20041;&#30340;&#12290;&#20219;&#20309;&#24773;&#20917;&#19979;&#65292;&#27492;&#20989;&#25968;&#25152;&#29992;&#30340;&#22810;&#23383;&#33410;&#23383;&#31526;&#32534;&#30721;&#20026;&#24403;&#21069;&#27963;&#36291;&#30340; C &#26412;&#22320;&#29615;&#22659;&#25152;&#25351;&#23450;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#21516; <span class="t-v">(1)</span> &#65292;&#38500;&#20102;</div>
<div class="t-li1"><span class="t-li"></span> &#33509; <code>s</code> &#20026;&#31354;&#25351;&#38024;&#65292;&#21017;&#35843;&#29992;&#31561;&#20215;&#20110;&#29992;&#20869;&#37096;&#21464;&#37327; <code>retval</code> &#21644; <code>buf</code> &#65288;&#20854;&#22823;&#23567;&#22823;&#20110; <span class="t-lc">MB_CUR_MAX</span> &#65289;&#30340; <span class="t-c"><span class="mw-geshi c source-c">wcrtomb_s<span class="br0">(</span><span class="sy3">&amp;</span>retval, buf, <span class="kw4">sizeof</span> buf, L<span class="st0">&#39;<span class="es5">\0</span>&#39;</span>, ps<span class="br0">)</span></span></span></div>
<div class="t-li1"><span class="t-li"></span> &#36820;&#22238;&#32467;&#26524;&#20110;&#36755;&#20986;&#21442;&#25968; <code>retval</code></div>
<div class="t-li1"><span class="t-li"></span> &#22312;&#36816;&#34892;&#26102;&#26816;&#27979;&#19979;&#21015;&#38169;&#35823;&#65292;&#24182;&#35843;&#29992;&#24403;&#21069;&#23433;&#35013;&#30340;<a href="c-error-set_constraint_handler_s.html">&#21046;&#32422;&#22788;&#29702;</a>&#20989;&#25968;&#65306;
<dl>
<dd>
<ul>
<li><code>retval</code> &#25110; <code>ps</code> &#20026;&#31354;&#25351;&#38024;&#12290;</li>
<li><code>ssz</code> &#20026;&#38646;&#25110;&#22823;&#20110; <span class="t-lc">RSIZE_MAX</span> &#65288;&#38500;&#38750; <code>s</code> &#20026;&#31354;&#65289;</li>
<li><code>ssz</code> &#23567;&#20110;&#20250;&#20889;&#20837;&#30340;&#23383;&#33410;&#25968;&#65288;&#38500;&#38750; <code>s</code> &#20026;&#31354;&#65289;</li>
<li><code>s</code> &#20026;&#31354;&#25351;&#38024;&#20294; <code>ssz</code> &#38750;&#38646;</li>
</ul>
</dd>
<dd></dd>
<dd>&#21516;&#25152;&#26377;&#36793;&#30028;&#26816;&#26597;&#20989;&#25968;&#65292; <code>wcrtomb_s</code> &#20165;&#33509;&#23454;&#29616;&#23450;&#20041;&#20102; <span class="t-c"><span class="mw-geshi c source-c">__STDC_LIB_EXT1__</span></span> &#65292;&#19988;&#29992;&#25143;&#22312;&#21253;&#21547; <code>wchar.h</code> &#21069;&#23450;&#20041; <span class="t-c"><span class="mw-geshi c source-c">__STDC_WANT_LIB_EXT1__</span></span> &#20026;&#25972;&#25968;&#24120;&#37327; <span class="t-c"><span class="mw-geshi c source-c"><span class="nu0">1</span></span></span> &#25165;&#20445;&#35777;&#21487;&#29992;&#12290;</dd>
</dl>
</div>
<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;&#31364;&#23383;&#31526;&#25968;&#32452;&#30340;&#25351;&#38024;&#65292;&#20854;&#20013;&#23558;&#23384;&#20648;&#22810;&#23383;&#33410;&#23383;&#31526;&#20018;</td>
</tr>
<tr class="t-par">
<td>wc</td>
<td>-</td>
<td>&#35201;&#36716;&#25442;&#30340;&#23485;&#23383;&#31526;</td>
</tr>
<tr class="t-par">
<td>ps</td>
<td>-</td>
<td>&#25351;&#21521;&#36716;&#35793;&#22810;&#23383;&#33410;&#23383;&#31526;&#20018;&#26102;&#25152;&#29992;&#30340;&#36716;&#25442;&#29366;&#24577;&#23545;&#35937;&#30340;&#25351;&#38024;</td>
</tr>
<tr class="t-par">
<td>ssz</td>
<td>-</td>
<td>&#35201;&#20889;&#20837;&#30340;&#26368;&#22823;&#23383;&#33410;&#25968;&#65288;&#32531;&#20914;&#21306; <code>s</code> &#30340;&#22823;&#23567;&#65289;</td>
</tr>
<tr class="t-par">
<td>retval</td>
<td>-</td>
<td>&#25351;&#21521;&#36755;&#20986;&#21442;&#25968;&#30340;&#25351;&#38024;&#65292;&#23558;&#23384;&#20648;&#32467;&#26524;&#20110;&#20854;&#20013;&#65288;&#22810;&#23383;&#33410;&#23383;&#31526;&#20018;&#30340;&#23383;&#33410;&#25968;&#65292;&#21253;&#21547;&#20219;&#20309;&#36801;&#31227;&#24207;&#21015;&#65289;</td>
</tr>
</table>
<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">&#36820;&#22238;&#20540;</span></h3>
<div class="t-li1"><span class="t-li">1)</span> &#25104;&#21151;&#26102;&#65292;&#36820;&#22238;&#20889;&#20837;&#39318;&#20803;&#32032;&#20026; <code>s</code> &#25152;&#25351;&#21521;&#30340;&#23383;&#31526;&#25968;&#32452;&#30340;&#23383;&#33410;&#25968;&#65288;&#21253;&#21547;&#20219;&#20309;&#36801;&#31227;&#24207;&#21015;&#65289;&#12290;</div>
<div class="t-li1"><span class="t-li"></span> &#22833;&#36133;&#26102;&#65288;&#33509; <span class="t-c"><span class="mw-geshi c source-c">wc</span></span> &#19981;&#26159;&#21512;&#27861;&#23485;&#23383;&#31526;&#65289;&#65292;&#36820;&#22238; <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;&#23384;&#20648; <span class="t-lc"><a href="c-error-errno_macros.html">EILSEQ</a></span> &#20110; <span class="t-lc"><a href="c-error-errno.html">errno</a></span> &#65292;&#24182;&#20351; <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>ps</span></span> &#30041;&#22312;&#26410;&#25351;&#23450;&#29366;&#24577;&#12290;</div>
<div class="t-li1"><span class="t-li">2)</span> &#25104;&#21151;&#26102;&#36820;&#22238;&#38646;&#12290;&#22833;&#36133;&#26102;&#36820;&#22238;&#38750;&#38646;&#65292;&#35813;&#24773;&#20917;&#19979;&#65292;&#35774;&#32622; <span class="t-c"><span class="mw-geshi c source-c">s<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span></span></span> &#20026; <span class="t-c"><span class="mw-geshi c source-c"><span class="st0">&#39;<span class="es5">\0</span>&#39;</span></span></span> &#65288;&#38500;&#38750; <code>s</code> &#20026;&#31354;&#25110; <code>ssz</code> &#20026;&#38646;&#25110;&#22823;&#20110; <span class="t-lc">RSIZE_MAX</span> &#65289;&#24182;&#35774;&#32622; <span class="t-c"><span class="mw-geshi c source-c"><span class="sy2">*</span>retval</span></span> &#20026; <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> &#65288;&#38500;&#38750; <code>retval</code> &#20026;&#31354;&#65289;&#12290;</div>
<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;stdio.h&gt;</span>
<span class="co2">#include &lt;locale.h&gt;</span>
<span class="co2">#include &lt;string.h&gt;</span>
<span class="co2">#include &lt;wchar.h&gt;</span>
<span class="co2">#include &lt;stdlib.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>
<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>
<a href="c-string-multibyte-mbstate_t.html"><span class="kw591">mbstate_t</span></a> state<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>state, <span class="nu0">0</span>, <span class="kw4">sizeof</span> state<span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">wchar_t</span> in<span class="br0">[</span><span class="br0">]</span> <span class="sy1">=</span> L<span class="st0">&quot;z&szlig;&#27700;&#127820;&quot;</span><span class="sy4">;</span> <span class="co1">// &#25110; &quot;z\u00df\u6c34\U0001F34C&quot;</span>
<a href="c-types-size_t.html"><span class="kw100">size_t</span></a> in_sz <span class="sy1">=</span> <span class="kw4">sizeof</span> in <span class="sy2">/</span> <span class="kw4">sizeof</span> <span class="sy2">*</span>in<span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;Processing %zu wchar_t units: [ &quot;</span>, in_sz<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span><span class="br0">(</span><a href="c-types-size_t.html"><span class="kw100">size_t</span></a> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1">&lt;</span> in_sz<span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span> <a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;%#x &quot;</span>, in<span class="br0">[</span>n<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-puts.html"><span class="kw835">puts</span></a><span class="br0">(</span><span class="st0">&quot;]&quot;</span><span class="br0">)</span><span class="sy4">;</span>
<span class="kw4">char</span> out<span class="br0">[</span>MB_CUR_MAX <span class="sy2">*</span> in_sz<span class="br0">]</span><span class="sy4">;</span>
<span class="kw4">char</span> <span class="sy2">*</span>p <span class="sy1">=</span> out<span class="sy4">;</span>
<span class="kw1">for</span><span class="br0">(</span><a href="c-types-size_t.html"><span class="kw100">size_t</span></a> n <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> n <span class="sy1">&lt;</span> in_sz<span class="sy4">;</span> <span class="sy2">++</span>n<span class="br0">)</span> <span class="br0">{</span>
<a href="c-types-size_t.html"><span class="kw100">size_t</span></a> rc <span class="sy1">=</span> wcrtomb<span class="br0">(</span>p, in<span class="br0">[</span>n<span class="br0">]</span>, <span class="sy3">&amp;</span>state<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">if</span><span class="br0">(</span>rc <span class="sy1">==</span> <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 class="br0">)</span> <span class="kw1">break</span><span class="sy4">;</span>
p <span class="sy2">+</span><span class="sy1">=</span> rc<span class="sy4">;</span>
<span class="br0">}</span>
<a href="c-types-size_t.html"><span class="kw100">size_t</span></a> out_sz <span class="sy1">=</span> p <span class="sy2">-</span> out<span class="sy4">;</span>
<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;into %zu UTF-8 code units: [ &quot;</span>, out_sz<span class="br0">)</span><span class="sy4">;</span>
<span class="kw1">for</span><span class="br0">(</span><a href="c-types-size_t.html"><span class="kw100">size_t</span></a> x <span class="sy1">=</span> <span class="nu0">0</span><span class="sy4">;</span> x <span class="sy1">&lt;</span> out_sz<span class="sy4">;</span> <span class="sy2">++</span>x<span class="br0">)</span> <a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">&quot;%#x &quot;</span>, <span class="sy2">+</span><span class="br0">(</span><span class="kw4">unsigned</span> <span class="kw4">char</span><span class="br0">)</span>out<span class="br0">[</span>x<span class="br0">]</span><span class="br0">)</span><span class="sy4">;</span>
<a href="c-io-puts.html"><span class="kw835">puts</span></a><span class="br0">(</span><span class="st0">&quot;]&quot;</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">Processing 5 wchar_t units: [ 0x7a 0xdf 0x6c34 0x1f34c 0 ]
into 11 UTF-8 code units: [ 0x7a 0xc3 0x9f 0xe6 0xb0 0xb4 0xf0 0x9f 0x8d 0x8c 0 ]</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>7.29.6.3.3 The wcrtomb function (p: 444)</li>
</ul>
</dd>
</dl>
<dl>
<dd>
<ul>
<li>K.3.9.3.1.1 The wcrtomb_s function (p: 647-648)</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>7.24.6.3.3 The wcrtomb function (p: 390)</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-wctomb.html"><span class="t-lines"><span>wctomb</span><span>wctomb_s</span></span></a></div>
<div><span class="t-lines"><span></span><span><span class="t-mark-rev t-since-c11">(C11)</span></span></span></div>
</div>
</td>
<td>&#23558;&#23485;&#23383;&#31526;&#36716;&#25442;&#25104;&#20854;&#22810;&#23383;&#33410;&#34920;&#31034;<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-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>
</table>
</div>
</div>
<div class="visualClear"></div>
</div>
</div>
</div>
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