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<a name="mbstowcs"></a>
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Next: <a href="mbtowc.html#mbtowc" accesskey="n" rel="next">mbtowc</a>, Previous: <a href="mbsrtowcs.html#mbsrtowcs" accesskey="p" rel="prev">mbsrtowcs</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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<a name="mbstowcs_002d_002d_002dminimal-multibyte-string-to-wide-char-converter"></a>
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<h3 class="section">2.29 <code>mbstowcs</code>—minimal multibyte string to wide char converter</h3>
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<a name="index-mbstowcs"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdlib.h>
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int mbstowcs(wchar_t *restrict <var>pwc</var>, const char *restrict <var>s</var>, size_t <var>n</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming
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implementation of <code>mbstowcs</code>. In this case, the
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only “multi-byte character sequences” recognized are single bytes,
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and they are “converted” to wide-char versions simply by byte
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extension.
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</p>
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<p>When _MB_CAPABLE is defined, this routine calls <code>_mbstowcs_r</code> to perform
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the conversion, passing a state variable to allow state dependent
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decoding. The result is based on the locale setting which may
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be restricted to a defined set of locales.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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This implementation of <code>mbstowcs</code> returns <code>0</code> if
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<var>s</var> is <code>NULL</code> or is the empty string;
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it returns <code>-1</code> if _MB_CAPABLE and one of the
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multi-byte characters is invalid or incomplete;
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otherwise it returns the minimum of: <code>n</code> or the
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number of multi-byte characters in <code>s</code> plus 1 (to
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compensate for the nul character).
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If the return value is -1, the state of the <code>pwc</code> string is
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indeterminate. If the input has a length of 0, the output
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string will be modified to contain a wchar_t nul terminator.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>mbstowcs</code> is required in the ANSI C standard. However, the precise
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effects vary with the locale.
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</p>
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<p><code>mbstowcs</code> requires no supporting OS subroutines.
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</p>
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