137 lines
8.4 KiB
HTML
137 lines
8.4 KiB
HTML
<!DOCTYPE html>
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<head><meta http-equiv="x-ua-compatible" content="ie=edge">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<title>mbsinit</title>
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<link rel="stylesheet" href="ext.css" />
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<link rel="stylesheet" href="site_modules.css" />
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-c_string_multibyte_mbsinit skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<div id="content"><a id="top"></a>
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<h1 id="firstHeading" class="firstHeading">mbsinit</h1>
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<div id="bodyContent">
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<div id="contentSub"><span class="subpages">< <a href="c.html">c</a>‎ | <a href="c-string.html">string</a>‎ | <a href="c-string-multibyte.html">multibyte</a></span></div>
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<div id="mw-content-text" lang="zh" dir="ltr" class="mw-content-ltr" xml:lang="zh">
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<table class="t-dcl-begin">
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<tbody>
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<tr class="t-dsc-header">
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<td>
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<div>定义于头文件 <code><wchar.h></code></div>
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</td>
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<td></td>
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<td></td>
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</tr>
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<tr class="t-dcl t-since-c95">
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<td>
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<div><span class="mw-geshi c source-c"><span class="kw4">int</span> mbsinit<span class="br0">(</span> <span class="kw4">const</span> <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>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-c95">(C95 起)</span></td>
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</tr>
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<tr class="t-dcl-sep">
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<td></td>
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<td></td>
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<p>若 <code>ps</code> 不是空指针，则 <code>mbsinit</code> 函数确定其所指向的 <span class="t-lc"><a href="c-string-multibyte-mbstate_t.html">mbstate_t</a></span> 对象是否描述初始迁移状态。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>尽管零初始化的 <span class="t-lc"><a href="c-string-multibyte-mbstate_t.html">mbstate_t</a></span> 始终表示初始转换状态，亦可能有其他 <span class="t-lc"><a href="c-string-multibyte-mbstate_t.html">mbstate_t</a></span> 值表示初始转换状态。</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<tr class="t-par">
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<td>ps</td>
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<td>-</td>
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<td>指向要检验的 mbstate_t 对象的指针</td>
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</tr>
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</table>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>若 <code>ps</code> 不是空指针且不表示初始迁移状态则为 <span class="t-c"><span class="mw-geshi c source-c">​<span class="nu0">0</span>​</span></span> ，否则为非零。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<div class="t-example">
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<div class="t-example-live-link"></div>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="c source-c">
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<pre class="de1"><span class="co2">#include <locale.h></span>
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<span class="co2">#include <string.h></span>
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<span class="co2">#include <stdio.h></span>
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<span class="co2">#include <wchar.h></span>
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<span class="kw4">int</span> main<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span>
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<span class="br0">{</span>
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<span class="co1">// 允许mbrlen()作用于UTF-8多字节字符串</span>
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<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">"en_US.utf8"</span><span class="br0">)</span><span class="sy4">;</span>
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<span class="co1">// UTF-8 narrow multibyte encoding</span>
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<span class="kw4">const</span> <span class="kw4">char</span><span class="sy2">*</span> str <span class="sy1">=</span> u8<span class="st0">"水"</span><span class="sy4">;</span> <span class="co1">// 或 u8"\u6c34" 或 "\xe6\xb0\xb4"</span>
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<span class="kw4">static</span> <a href="c-string-multibyte-mbstate_t.html"><span class="kw591">mbstate_t</span></a> mb<span class="sy4">;</span> <span class="co1">// 零初始化</span>
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<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span><a href="c-string-multibyte-mbrlen.html"><span class="kw582">mbrlen</span></a><span class="br0">(</span><span class="sy3">&</span>str<span class="br0">[</span><span class="nu0">0</span><span class="br0">]</span>, <span class="nu0">1</span>, <span class="sy3">&</span>mb<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">if</span> <span class="br0">(</span><span class="sy3">!</span>mbsinit<span class="br0">(</span><span class="sy3">&</span>mb<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
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<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">"After processing the first 1 byte of %s,<span class="es1">\n</span>"</span>
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<span class="st0">"the conversion state is not initial<span class="es1">\n</span><span class="es1">\n</span>"</span>, str<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">(</span><span class="kw4">void</span><span class="br0">)</span><a href="c-string-multibyte-mbrlen.html"><span class="kw582">mbrlen</span></a><span class="br0">(</span><span class="sy3">&</span>str<span class="br0">[</span><span class="nu0">1</span><span class="br0">]</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="sy3">&</span>mb<span class="br0">)</span><span class="sy4">;</span>
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<span class="kw1">if</span> <span class="br0">(</span>mbsinit<span class="br0">(</span><span class="sy3">&</span>mb<span class="br0">)</span><span class="br0">)</span> <span class="br0">{</span>
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<a href="c-io-fprintf.html"><span class="kw850">printf</span></a><span class="br0">(</span><span class="st0">"After processing the remaining 2 bytes of %s,<span class="es1">\n</span>"</span>
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<span class="st0">"the conversion state is initial conversion state<span class="es1">\n</span>"</span>, str<span class="br0">)</span><span class="sy4">;</span>
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<span class="br0">}</span>
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<span class="br0">}</span></pre></div>
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</div>
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<p>输出：</p>
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<div dir="ltr" class="mw-geshi" style="text-align: left;">
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<div class="text source-text">
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<pre class="de1">After processing the first 1 byte of 水,
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the conversion state is not initial
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After processing the remaining 2 bytes of 水,
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the conversion state is initial conversion state</pre></div>
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</div>
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</div>
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<h3><span class="mw-headline" id=".E5.BC.95.E7.94.A8">引用</span></h3>
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<div class="t-ref-std-11">
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<ul>
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<li>C11 标准（ISO/IEC 9899:2011）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.29.6.2.1 The mbsinit function (p: 441-442)</li>
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</ul>
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</dd>
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</dl>
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<div class="t-ref-std-c99">
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<ul>
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<li>C99 标准（ISO/IEC 9899:1999）：</li>
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</ul>
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<dl>
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<dd>
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<ul>
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<li>7.24.6.2.1 The mbsinit function (p: 387-388)</li>
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</ul>
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</dd>
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</dl>
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</div>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<table class="t-dsc-begin">
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="c-string-multibyte-mbstate_t.html"><span class="t-lines"><span>mbstate_t</span></span></a></div>
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<div><span class="t-lines"><span><span class="t-mark-rev t-since-c95">(C95)</span></span></span></div>
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</div>
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</td>
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<td>迭代多字节字符串所需的转换信息<br />
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<span class="t-mark">(结构体)</span></td>
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</tr>
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</table>
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</div>
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</div>
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<div class="visualClear"></div>
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</div>
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</div>
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</div>
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</body>
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</html>
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