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<a name="wcsrtombs_002c-wcsnrtombs_002d_002d_002dconvert-a-wide_002dcharacter-string-to-a-character-string"></a>
<h3 class="section">2.42 <code>wcsrtombs</code>, <code>wcsnrtombs</code>&mdash;convert a wide-character string to a character string</h3>
<a name="index-wcsrtombs"></a>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;wchar.h&gt;
size_t wcsrtombs(char *__restrict <var>dst</var>,
    const wchar_t **__restrict <var>src</var>, size_t <var>len</var>,
    mbstate_t *__restrict <var>ps</var>);

#include &lt;wchar.h&gt;
size_t _wcsrtombs_r(struct _reent *<var>ptr</var>, char *<var>dst</var>,
    const wchar_t **<var>src</var>, size_t <var>len</var>,
    mbstate_t *<var>ps</var>);

#include &lt;wchar.h&gt;
size_t wcsnrtombs(char *__restrict <var>dst</var>,
    const wchar_t **__restrict <var>src</var>,
    size_t <var>nwc</var>, size_t <var>len</var>,
    mbstate_t *__restrict <var>ps</var>);

#include &lt;wchar.h&gt;
size_t _wcsnrtombs_r(struct _reent *<var>ptr</var>, char *<var>dst</var>,
    const wchar_t **<var>src</var>, size_t <var>nwc</var>,
    size_t <var>len</var>, mbstate_t *<var>ps</var>);

</pre></div>
<p><strong>Description</strong><br>
The <code>wcsrtombs</code> function converts a string of wide characters indirectly
pointed to by <var>src</var> to a corresponding multibyte character string stored in
the array pointed to by <var>dst</var>.  No more than <var>len</var> bytes are written to
<var>dst</var>.
</p>
<p>If <var>dst</var> is NULL, no characters are stored.
</p>
<p>If <var>dst</var> is not NULL, the pointer pointed to by <var>src</var> is updated to point
to the character after the one that conversion stopped at.  If conversion
stops because a null character is encountered, *<var>src</var> is set to NULL.
</p>
<p>The mbstate_t argument, <var>ps</var>, is used to keep track of the shift state.  If
it is NULL, <code>wcsrtombs</code> uses an internal, static mbstate_t object, which
is initialized to the initial conversion state at program startup.
</p>
<p>The <code>wcsnrtombs</code> function behaves identically to <code>wcsrtombs</code>, except that
conversion stops after reading at most <var>nwc</var> characters from the buffer
pointed to by <var>src</var>.
</p>
<br>
<p><strong>Returns</strong><br>
The <code>wcsrtombs</code> and <code>wcsnrtombs</code> functions return the number of bytes
stored in the array pointed to by <var>dst</var> (not including any terminating
null), if successful, otherwise it returns (size_t)-1.
</p>
<br>
<p><strong>Portability</strong><br>
<code>wcsrtombs</code> is defined by C99 standard.
<code>wcsnrtombs</code> is defined by the POSIX.1-2008 standard.
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