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| <h3 class="section">6.27 <code>wcswidth</code>—number of column positions of a wide-character string</h3> |
| |
| <p><a name="index-wcswidth-420"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <wchar.h> |
| int wcswidth(const wchar_t *<var>pwcs</var>, size_t <var>n</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| The <code>wcswidth</code> function shall determine the number of column |
| positions required for <var>n</var> wide-character codes (or fewer than <var>n</var> |
| wide-character codes if a null wide-character code is encountered |
| before <var>n</var> wide-character codes are exhausted) in the string pointed |
| to by <var>pwcs</var>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The <code>wcswidth</code> function either shall return 0 (if <var>pwcs</var> points to a |
| null wide-character code), or return the number of column positions |
| to be occupied by the wide-character string pointed to by <var>pwcs</var>, or |
| return -1 (if any of the first <var>n</var> wide-character codes in the |
| wide-character string pointed to by <var>pwcs</var> is not a printable |
| wide-character code). |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| <code>wcswidth</code> has been introduced in the Single UNIX Specification Volume 2. |
| <code>wcswidth</code> has been marked as an extension in the Single UNIX Specification Volume 3. |
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