129 lines
4.5 KiB
HTML
129 lines
4.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<!-- Copyright (c) 2001 The Open Group, All Rights Reserved -->
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<title>qsort</title>
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<body bgcolor="white">
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<script type="text/javascript" language="JavaScript" src="../jscript/codes.js">
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<basefont size="3"> <a name="qsort"></a> <a name="tag_03_590"></a><!-- qsort -->
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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_590_01"></a>NAME</h4>
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<blockquote>qsort - sort a table of data</blockquote>
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<h4><a name="tag_03_590_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/stdlib.h.html">stdlib.h</a>><br>
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<br>
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void qsort(void *</tt><i>base</i><tt>, size_t</tt> <i>nel</i><tt>, size_t</tt> <i>width</i><tt>,<br>
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int (*</tt><i>compar</i><tt>)(const void *, const void *));<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_590_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>qsort</i>() function shall sort an array of <i>nel</i> objects, the initial element of which is pointed to by
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<i>base</i>. The size of each object, in bytes, is specified by the <i>width</i> argument.</p>
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<p>The contents of the array shall be sorted in ascending order according to a comparison function. The <i>compar</i> argument is a
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pointer to the comparison function, which is called with two arguments that point to the elements being compared. The application
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shall ensure that the function returns an integer less than, equal to, or greater than 0, if the first argument is considered
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respectively less than, equal to, or greater than the second. If two members compare as equal, their order in the sorted array is
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unspecified.</p>
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</blockquote>
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<h4><a name="tag_03_590_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>The <i>qsort</i>() function shall not return a value.</p>
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</blockquote>
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<h4><a name="tag_03_590_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_590_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_590_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The comparison function need not compare every byte, so arbitrary data may be contained in the elements in addition to the
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values being compared.</p>
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</blockquote>
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<h4><a name="tag_03_590_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_590_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_590_10"></a>SEE ALSO</h4>
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<blockquote>
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<p>The Base Definitions volume of IEEE Std 1003.1-2001, <a href=
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"../basedefs/stdlib.h.html"><i><stdlib.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_590_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 1. Derived from Issue 1 of the SVID.</p>
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</blockquote>
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<h4><a name="tag_03_590_12"></a>Issue 6</h4>
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<blockquote>
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<p>The DESCRIPTION is updated to avoid use of the term "must" for application requirements.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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