124 lines
4.2 KiB
HTML
124 lines
4.2 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>wcswidth</title>
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<basefont size="3"> <a name="wcswidth"></a> <a name="tag_03_852"></a><!-- wcswidth -->
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<!--header start-->
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<center><font size="2">The Open Group Base Specifications Issue 6<br>
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IEEE Std 1003.1-2001<br>
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Copyright © 2001 The IEEE and The Open Group, All Rights reserved.</font></center>
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<!--header end-->
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<hr size="2" noshade>
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<h4><a name="tag_03_852_01"></a>NAME</h4>
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<blockquote>wcswidth - number of column positions of a wide-character string</blockquote>
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<h4><a name="tag_03_852_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<div class="box"><code><tt><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt=
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"[Option Start]" border="0"> #include <<a href="../basedefs/wchar.h.html">wchar.h</a>><br>
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<br>
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int wcswidth(const wchar_t *</tt><i>pwcs</i><tt>, size_t</tt> <i>n</i><tt>); <img src="../images/opt-end.gif" alt="[Option End]"
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border="0"></tt></code></div>
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<tt><br>
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</tt></blockquote>
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<h4><a name="tag_03_852_03"></a>DESCRIPTION</h4>
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<blockquote>
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<p>The <i>wcswidth</i>() function shall determine the number of column positions required for <i>n</i> wide-character codes (or
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fewer than <i>n</i> wide-character codes if a null wide-character code is encountered before <i>n</i> wide-character codes are
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exhausted) in the string pointed to by <i>pwcs</i>.</p>
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</blockquote>
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<h4><a name="tag_03_852_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>The <i>wcswidth</i>() function either shall return 0 (if <i>pwcs</i> points to a null wide-character code), or return the number
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of column positions to be occupied by the wide-character string pointed to by <i>pwcs</i>, or return -1 (if any of the first
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<i>n</i> wide-character codes in the wide-character string pointed to by <i>pwcs</i> is not a printable wide-character code).</p>
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</blockquote>
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<h4><a name="tag_03_852_05"></a>ERRORS</h4>
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<blockquote>
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<p>No errors are defined.</p>
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</blockquote>
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<hr>
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<div class="box"><em>The following sections are informative.</em></div>
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<h4><a name="tag_03_852_06"></a>EXAMPLES</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_852_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>This function was removed from the final ISO/IEC 9899:1990/Amendment 1:1995 (E), and the return value for a non-printable
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wide character is not specified.</p>
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</blockquote>
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<h4><a name="tag_03_852_08"></a>RATIONALE</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_852_09"></a>FUTURE DIRECTIONS</h4>
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<blockquote>
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<p>None.</p>
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</blockquote>
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<h4><a name="tag_03_852_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="wcwidth.html"><i>wcwidth</i>()</a> , the Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/xbd_chap03.html#tag_03_103">Section 3.103, Column Position</a>, <a href=
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"../basedefs/wchar.h.html"><i><wchar.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_852_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4. Derived from the MSE working draft.</p>
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</blockquote>
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<h4><a name="tag_03_852_12"></a>Issue 6</h4>
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<blockquote>
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<p>The Open Group Corrigendum U021/11 is applied. The function is marked as an extension.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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