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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>sprintf</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch02.html#id2953161" title="String Conversions" /><link rel="prev" href="re51.html" title="vsprintf" /><link rel="next" href="re53.html" title="vbin_printf" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>sprintf</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re51.html">Prev</a> </td><th width="60%" align="center">String Conversions</th><td width="20%" align="right"> <a accesskey="n" href="re53.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="sprintf"><a id="API-sprintf"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>sprintf —
Format a string and place it in a buffer
</p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">sprintf </b>(</code></td><td>char * <var class="pdparam">buf</var>, </td></tr><tr><td> </td><td>const char * <var class="pdparam">fmt</var>, </td></tr><tr><td> </td><td> <var class="pdparam">...</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2955574"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>buf</code></em></span></dt><dd><p>
The buffer to place the result into
</p></dd><dt><span class="term"><em class="parameter"><code>fmt</code></em></span></dt><dd><p>
The format string to use
@...: Arguments for the format string
</p></dd><dt><span class="term"><em class="parameter"><code>...</code></em></span></dt><dd><p>
variable arguments
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2955634"></a><h2>Description</h2><p>
The function returns the number of characters written
into <em class="parameter"><code>buf</code></em>. Use <code class="function">snprintf</code> or <code class="function">scnprintf</code> in order to avoid
buffer overflows.
</p><p>
See the <code class="function">vsnprintf</code> documentation for format string extensions over C99.
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