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| <h3 class="section">6.29 <code>wcwidth</code>—number of column positions of a wide-character code</h3> |
| |
| <p><a name="index-wcwidth-422"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <wchar.h> |
| int wcwidth(const wchar_t <var>wc</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| The <code>wcwidth</code> function shall determine the number of column |
| positions required for the wide character <var>wc</var>. The application |
| shall ensure that the value of <var>wc</var> is a character representable |
| as a wchar_t, and is a wide-character code corresponding to a |
| valid character in the current locale. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The <code>wcwidth</code> function shall either return 0 (if <var>wc</var> is a null |
| wide-character code), or return the number of column positions to |
| be occupied by the wide-character code <var>wc</var>, or return -1 (if <var>wc</var> |
| does not correspond to a printable wide-character code). |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>wcwidth</code> has been introduced in the Single UNIX Specification Volume 2. |
| <code>wcwidth</code> has been marked as an extension in the Single UNIX Specification Volume 3. |
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