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<a name="mblen"></a>
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<p>
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Next: <a href="mbsrtowcs.html#mbsrtowcs" accesskey="n" rel="next">mbsrtowcs</a>, Previous: <a href="_005f_005fmalloc_005flock.html#g_t_005f_005fmalloc_005flock" accesskey="p" rel="prev">__malloc_lock</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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<hr>
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<a name="mblen_002d_002d_002dminimal-multibyte-length-function"></a>
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<h3 class="section">2.27 <code>mblen</code>—minimal multibyte length function</h3>
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<a name="index-mblen"></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 mblen(const char *<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>mblen</code>. In this case, the
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only “multi-byte character sequences” recognized are single bytes,
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and thus <code>1</code> is returned unless <var>s</var> is the null pointer or
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has a length of 0 or is the empty string.
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</p>
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<p>When _MB_CAPABLE is defined, this routine calls <code>_mbtowc_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>mblen</code> returns <code>0</code> if
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<var>s</var> is <code>NULL</code> or the empty string; it returns <code>1</code> if not _MB_CAPABLE or
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the character is a single-byte character; it returns <code>-1</code>
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if the multi-byte character is invalid; otherwise it returns
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the number of bytes in the multibyte character.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>mblen</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>mblen</code> requires no supporting OS subroutines.
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</p>
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