man/v1.6.0/nng_strdup.3.html


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---
version: v1.6.0
layout: manpage_v2
title: nng_strdup(3)
---
<h1>nng_strdup(3)</h1>
<div class="sect1">
<h2 id="_name">NAME</h2>
<div class="sectionbody">
<div class="paragraph">
<p>nng_strdup - duplicate string</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_synopsis">SYNOPSIS</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre class="pygments highlight"><code data-lang="c"><span class="tok-cp">#include</span> <span class="tok-cpf">&lt;nng/nng.h&gt;</span>

<span class="tok-kt">char</span> <span class="tok-o">*</span><span class="tok-nf">nng_strdup</span><span class="tok-p">(</span><span class="tok-k">const</span> <span class="tok-kt">char</span> <span class="tok-o">*</span><span class="tok-n">src</span><span class="tok-p">);</span></code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_description">DESCRIPTION</h2>
<div class="sectionbody">
<div class="paragraph">
<p>The <code>nng_strdup()</code> duplicates the string <em>src</em> and returns it.</p>
</div>
<div class="paragraph">
<p>This is logically equivalent to using <a href="nng_alloc.3.html"><code>nng_alloc()</code></a>
to allocate a region of memory of <code>strlen(s) + 1</code> bytes, and then
using <code>strcpy()</code> to copy the string into the destination before
returning it.</p>
</div>
<div class="paragraph">
<p>The returned string should be deallocated with
<a href="nng_strfree.3.html"><code>nng_strfree()</code></a>, or may be deallocated using the
<a href="nng_free.3.html"><code>nng_free()</code></a> using the length of the returned string plus
one (for the <code>NUL</code> terminating byte).</p>
</div>
<div class="admonitionblock important">
<table>
<tr>
<td class="icon">
<i class="fa icon-important" title="Important"></i>
</td>
<td class="content">
Do not use the system <code>free()</code> or similar functions to deallocate
the string, since those may use a different memory arena!
</td>
</tr>
</table>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_return_values">RETURN VALUES</h2>
<div class="sectionbody">
<div class="paragraph">
<p>This function returns the new string on success, and <code>NULL</code> on failure.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_errors">ERRORS</h2>
<div class="sectionbody">
<div class="paragraph">
<p>No errors are returned, but a <code>NULL</code> return value should be
treated the same as <code>NNG_ENOMEM</code>.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">SEE ALSO</h2>
<div class="sectionbody">
<div class="paragraph text-left">
<p><a href="nng_alloc.3.html">nng_alloc(3)</a>,
<a href="nng_free.3.html">nng_free(3)</a>,
<a href="nng.7.html">nng(7)</a></p>
</div>
</div>
</div>