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‎reference/cstdio.html

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最終更新日時(UTC):
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<span itemprop="datePublished" content="2025-07-16T16:04:57">
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2025年07月16日 16時04分57秒
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<span itemprop="datePublished" content="2025-07-19T12:37:51">
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2025年07月19日 12時37分51秒
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<td><code><span href="https://cpprefjp.github.io/reference/cstdio/bufsiz.md.nolink">BUFSIZ</span></code></td>
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<td><code><a href="cstdio/bufsiz.html">BUFSIZ</a></code></td>
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<td>バッファサイズを表す整数定数</td>
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<td></td>
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‎reference/cstdio/bufsiz.html

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2025年07月20日 11時03分27秒
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<div class="identifier-type">macro</div><div class="header">&lt;cstdio&gt;</div><h1 itemprop="name"><span class="token">BUFSIZ</span></h1>
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<div itemprop="articleBody"><p><div class="codehilite"><pre><span></span><code><span class="cp">#define BUFSIZ <i>unspecified</i></span>
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</code></pre></div>
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</p>
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<h2>概要</h2>
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<p><code><span href="https://cpprefjp.github.io/reference/cstdio/setbuf.md.nolink">setbuf()</span></code>関数で使われる標準入出力のバッファサイズを表すマクロ。</p>
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<p>このマクロは、標準入出力関数で使用されるデフォルトのバッファサイズを定義する。値は実装依存であるが、一般的には512バイトや1024バイトなどの値が使用される。</p>
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<h2>例</h2>
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<p><div class="yata" id="2c73535b07897a7161e6584d601b6cbb826e999c"><div class="codehilite"><pre><span></span><code><span class="cp">#include</span> <span class="cpf"><a href="../cstdio.html">&lt;cstdio&gt;</a></span><span class="cp"></span>
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<span class="kt">int</span> <span class="nf">main</span><span class="p">()</span> <span class="p">{</span>
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<span class="c1">// <span style="color:#ff0000">BUFSIZ</span>の値を表示</span>
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<span class="n"><a href="printf.html">std::printf</a></span><span class="p">(</span><span class="s">"<span style="color:#ff0000">BUFSIZ</span> = %d</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n"><span style="color:#ff0000">BUFSIZ</span></span><span class="p">);</span>
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<span class="c1">// バッファサイズを指定してファイルを開く</span>
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<span class="kt">char</span> <span class="n">buffer</span><span class="p">[</span><span class="n"><span style="color:#ff0000">BUFSIZ</span></span><span class="p">];</span>
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<span class="n">std</span><span class="o">::</span><span class="kt">FILE</span><span class="o">*</span> <span class="n">file</span> <span class="o">=</span> <span class="n"><a href="fopen.html">std::fopen</a></span><span class="p">(</span><span class="s">"test.txt"</span><span class="p">,</span> <span class="s">"w"</span><span class="p">);</span>
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<span class="k">if</span> <span class="p">(</span><span class="n">file</span><span class="p">)</span> <span class="p">{</span>
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<span class="c1">// バッファを設定</span>
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<span class="n"><span href="https://cpprefjp.github.io/reference/cstdio/setbuf.md.nolink">std::setbuf</span></span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="n">buffer</span><span class="p">);</span>
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<span class="n"><a href="fprintf.html">std::fprintf</a></span><span class="p">(</span><span class="n">file</span><span class="p">,</span> <span class="s">"Hello, World!</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span>
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<span class="n"><a href="fclose.html">std::fclose</a></span><span class="p">(</span><span class="n">file</span><span class="p">);</span>
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<span class="p">}</span>
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<span class="k">return</span> <span class="mi">0</span><span class="p">;</span>
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<span class="p">}</span>
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</code></pre></div>
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</div></p>
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<h3>出力例</h3>
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<p><pre><code>BUFSIZ = 1024
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</code></pre></p>
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<h2>処理系</h2>
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<li><a href="../../implementation.html#clang">Clang</a>: ??</li>
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<li><a href="../../implementation.html#gcc">GCC</a>: ??</li>
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