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93 lines
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Previous: <a href="wcsxfrm.html#wcsxfrm" accesskey="p" rel="prev">wcsxfrm</a>, Up: <a href="Wchar-strings.html#Wchar-strings" accesskey="u" rel="up">Wchar strings</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="wcwidth_002d_002d_002dnumber-of-column-positions-of-a-wide_002dcharacter-code"></a>
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<h3 class="section">6.30 <code>wcwidth</code>—number of column positions of a wide-character code</h3>
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<a name="index-wcwidth"></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 <wchar.h>
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int wcwidth(const wint_t <var>wc</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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The <code>wcwidth</code> function shall determine the number of column
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positions required for the wide character <var>wc</var>. The application
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shall ensure that the value of <var>wc</var> is a character representable
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as a wint_t (combining Unicode surrogate pairs into single 21-bit
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Unicode code points), and is a wide-character code corresponding to a
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valid character in the current locale.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The <code>wcwidth</code> function shall either return 0 (if <var>wc</var> is a null
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wide-character code), or return the number of column positions to
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be occupied by the wide-character code <var>wc</var>, or return -1 (if <var>wc</var>
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does not correspond to a printable wide-character code).
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>wcwidth</code> has been introduced in the Single UNIX Specification Volume 2.
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<code>wcwidth</code> has been marked as an extension in the Single UNIX Specification Volume 3.
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