166 lines
6.6 KiB
HTML
166 lines
6.6 KiB
HTML
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<title>strxfrm</title>
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<basefont size="3"> <a name="strxfrm"></a> <a name="tag_03_748"></a><!-- strxfrm -->
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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_748_01"></a>NAME</h4>
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<blockquote>strxfrm - string transformation</blockquote>
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<h4><a name="tag_03_748_02"></a>SYNOPSIS</h4>
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<blockquote class="synopsis">
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<p><code><tt>#include <<a href="../basedefs/string.h.html">string.h</a>><br>
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<br>
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size_t strxfrm(char *restrict</tt> <i>s1</i><tt>, const char *restrict</tt> <i>s2</i><tt>, size_t</tt> <i>n</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_748_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>strxfrm</i>() function shall transform the string pointed to by <i>s2</i> and place the resulting string into the array
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pointed to by <i>s1</i>. The transformation is such that if <a href="../functions/strcmp.html"><i>strcmp</i>()</a> is applied to
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two transformed strings, it shall return a value greater than, equal to, or less than 0, corresponding to the result of <a href=
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"../functions/strcoll.html"><i>strcoll</i>()</a> applied to the same two original strings. No more than <i>n</i> bytes are placed
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into the resulting array pointed to by <i>s1</i>, including the terminating null byte. If <i>n</i> is 0, <i>s1</i> is permitted to
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be a null pointer. If copying takes place between objects that overlap, the behavior is undefined.</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>strxfrm</i>() function shall not change the setting of <i>errno</i> if successful.</p>
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<p>Since no return value is reserved to indicate an error, an application wishing to check for error situations should set
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<i>errno</i> to 0, then call <i>strxfrm</i>(), then check <i>errno</i>. <img src="../images/opt-end.gif" alt="[Option End]" border=
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"0"></p>
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</blockquote>
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<h4><a name="tag_03_748_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>Upon successful completion, <i>strxfrm</i>() shall return the length of the transformed string (not including the terminating
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null byte). If the value returned is <i>n</i> or more, the contents of the array pointed to by <i>s1</i> are unspecified.</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"> On
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error, <i>strxfrm</i>() may 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_748_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>strxfrm</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 string pointed to by the <i>s2</i> argument contains characters 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_748_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_748_07"></a>APPLICATION USAGE</h4>
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<blockquote>
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<p>The transformation function is such that two transformed strings can be ordered by <a href=
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"../functions/strcmp.html"><i>strcmp</i>()</a> as appropriate to collating sequence information in the program's locale (category
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<i>LC_COLLATE ).</i></p>
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<p>The fact that when <i>n</i> is 0 <i>s1</i> is permitted to be a null pointer is useful to determine the size of the <i>s1</i>
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array prior to making the transformation.</p>
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</blockquote>
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<h4><a name="tag_03_748_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_748_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_748_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="strcmp.html"><i>strcmp</i>()</a> , <a href="strcoll.html"><i>strcoll</i>()</a> , the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/string.h.html"><i><string.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_748_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 3. Included for alignment with the ISO C standard.</p>
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</blockquote>
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<h4><a name="tag_03_748_12"></a>Issue 5</h4>
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<blockquote>
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<p>The DESCRIPTION is updated to indicate that <i>errno</i> does not change if the function is successful.</p>
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</blockquote>
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<h4><a name="tag_03_748_13"></a>Issue 6</h4>
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<blockquote>
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<p>Extensions beyond the ISO C standard are marked.</p>
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<p>The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification:</p>
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<ul>
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<li>
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<p>In the RETURN VALUE and ERRORS sections, the [EINVAL] optional error condition is added if no conversion could be performed.</p>
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</li>
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</ul>
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<p>The <i>strxfrm</i>() prototype is updated for alignment with the ISO/IEC 9899:1999 standard.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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