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<a name="strnlen_002d_002d_002dcharacter-string-length"></a>
<h3 class="section">5.36 <code>strnlen</code>&mdash;character string length</h3>
<a name="index-strnlen"></a>
<p><strong>Synopsis</strong>
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<pre class="example">#include &lt;string.h&gt;
size_t strnlen(const char *<var>str</var>, size_t <var>n</var>);

</pre></div>
<p><strong>Description</strong><br>
The <code>strnlen</code> function works out the length of the string
starting at <code>*<var>str</var></code> by counting chararacters until it
reaches a NUL character or the maximum: <var>n</var> number of
characters have been inspected.
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<p><strong>Returns</strong><br>
<code>strnlen</code> returns the character count or <var>n</var>.
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<p><strong>Portability</strong><br>
<code>strnlen</code> is a GNU extension.
</p>
<p><code>strnlen</code> requires no supporting OS subroutines.
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