143 lines
5.5 KiB
HTML
143 lines
5.5 KiB
HTML
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>wcscoll</title>
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<basefont size="3"> <a name="wcscoll"></a> <a name="tag_03_829"></a><!-- wcscoll -->
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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_829_01"></a>NAME</h4>
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<blockquote>wcscoll - wide-character string comparison using collating information</blockquote>
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<h4><a name="tag_03_829_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/wchar.h.html">wchar.h</a>><br>
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<br>
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int wcscoll(const wchar_t *</tt><i>ws1</i><tt>, const wchar_t *</tt><i>ws2</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_829_03"></a>DESCRIPTION</h4>
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<blockquote>
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<div class="box"><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]"
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border="0"> The functionality described on this reference page is aligned with the ISO C standard. Any conflict between the
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requirements described here and the ISO C standard is unintentional. This volume of IEEE Std 1003.1-2001 defers to
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the ISO C standard. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></div>
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<p>The <i>wcscoll</i>() function shall compare the wide-character string pointed to by <i>ws1</i> to the wide-character string
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pointed to by <i>ws2</i>, both interpreted as appropriate to the <i>LC_COLLATE</i> category of the current locale.</p>
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<p><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> The
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<i>wcscoll</i>() function shall not change the setting of <i>errno</i> if successful.</p>
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<p>An application wishing to check for error situations should set <i>errno</i> to 0 before calling <i>wcscoll</i>(). If
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<i>errno</i> is non-zero on return, an error has occurred. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p>
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</blockquote>
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<h4><a name="tag_03_829_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>wcscoll</i>() shall return an integer greater than, equal to, or less than 0, according to
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whether the wide-character string pointed to by <i>ws1</i> is greater than, equal to, or less than the wide-character string
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pointed to by <i>ws2</i>, when both are interpreted as appropriate to the current locale. <sup>[<a href=
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"javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> On error,
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<i>wcscoll</i>() shall set <i>errno</i>, but no return value is reserved to indicate an error. <img src="../images/opt-end.gif"
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alt="[Option End]" border="0"></p>
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</blockquote>
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<h4><a name="tag_03_829_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>wcscoll</i>() function may fail if:</p>
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<dl compact>
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<dt>[EINVAL]</dt>
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<dd><sup>[<a href="javascript:open_code('CX')">CX</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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The <i>ws1</i> or <i>ws2</i> arguments contain wide-character codes outside the domain of the collating sequence. <img src=
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"../images/opt-end.gif" alt="[Option End]" border="0"></dd>
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</dl>
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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_829_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_829_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The <a href="../functions/wcsxfrm.html"><i>wcsxfrm</i>()</a> and <a href="../functions/wcscmp.html"><i>wcscmp</i>()</a>
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functions should be used for sorting large lists.</p>
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</blockquote>
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<h4><a name="tag_03_829_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_829_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_829_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="wcscmp.html"><i>wcscmp</i>()</a> , <a href="wcsxfrm.html"><i>wcsxfrm</i>()</a> , the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/wchar.h.html"><i><wchar.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_829_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_829_12"></a>Issue 5</h4>
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<blockquote>
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<p>Moved from ENHANCED I18N to BASE and the [ENOSYS] error is removed.</p>
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<p>The DESCRIPTION is updated to indicate that <i>errno</i> is not changed if the function is successful.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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