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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>snprintf</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#id2621104" title="String Conversions" /><link rel="prev" href="re48.html" title="vscnprintf" /><link rel="next" href="re50.html" title="scnprintf" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>snprintf</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re48.html">Prev</a> </td><th width="60%" align="center">String Conversions</th><td width="20%" align="right"> <a accesskey="n" href="re50.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="snprintf"><a id="API-snprintf"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>snprintf —
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">snprintf </b>(</code></td><td>char * <var class="pdparam">buf</var>, </td></tr><tr><td> </td><td>size_t <var class="pdparam">size</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="id2622941"></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>size</code></em></span></dt><dd><p>
The size of the buffer, including the trailing null space
</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="id2623019"></a><h2>Description</h2><p>
The return value is the number of characters which would be
generated for the given input, excluding the trailing null,
as per ISO C99. If the return is greater than or equal to
<em class="parameter"><code>size</code></em>, the resulting string is truncated.
</p><p>
See the <code class="function">vsnprintf</code> documentation for format string extensions over C99.
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