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<a name="mbsrtowcs_002c-mbsnrtowcs_002d_002d_002dconvert-a-character-string-to-a-wide_002dcharacter-string"></a>
<h3 class="section">2.28 <code>mbsrtowcs</code>, <code>mbsnrtowcs</code>&mdash;convert a character string to a wide-character string</h3>
<a name="index-mbsrtowcs"></a>
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<p><strong>Synopsis</strong>
</p><div class="example">
<pre class="example">#include &lt;wchar.h&gt;
size_t mbsrtowcs(wchar_t *__restrict <var>dst</var>,
    const char **__restrict <var>src</var>,
    size_t <var>len</var>,
    mbstate_t *__restrict <var>ps</var>);

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

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

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

</pre></div>
<p><strong>Description</strong><br>
The <code>mbsrtowcs</code> function converts a sequence of multibyte characters
pointed to indirectly by <var>src</var> into a sequence of corresponding wide
characters and stores at most <var>len</var> of them in the wchar_t array pointed
to by <var>dst</var>, until it encounters a terminating null character (&rsquo;\0&rsquo;).
</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>mbsrtowcs</code> uses an internal, static mbstate_t object, which
is initialized to the initial conversion state at program startup.
</p>
<p>The <code>mbsnrtowcs</code> function behaves identically to <code>mbsrtowcs</code>, except that
conversion stops after reading at most <var>nms</var> bytes from the buffer pointed
to by <var>src</var>.
</p>
<br>
<p><strong>Returns</strong><br>
The <code>mbsrtowcs</code> and <code>mbsnrtowcs</code> functions return the number of wide
characters stored in the array pointed to by <var>dst</var> if successful, otherwise
it returns (size_t)-1.
</p>
<br>
<p><strong>Portability</strong><br>
<code>mbsrtowcs</code> is defined by the C99 standard.
<code>mbsnrtowcs</code> is defined by the POSIX.1-2008 standard.
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