146 lines
5.9 KiB
HTML
146 lines
5.9 KiB
HTML
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<title>wctomb</title>
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<basefont size="3"> <a name="wctomb"></a> <a name="tag_03_855"></a><!-- wctomb -->
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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_855_01"></a>NAME</h4>
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<blockquote>wctomb - convert a wide-character code to a character</blockquote>
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<h4><a name="tag_03_855_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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int wctomb(char *</tt><i>s</i><tt>, wchar_t</tt> <i>wchar</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_855_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>wctomb</i>() function shall determine the number of bytes needed to represent the character corresponding to the
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wide-character code whose value is <i>wchar</i> (including any change in the shift state). It shall store the character
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representation (possibly multiple bytes and any special bytes to change shift state) in the array object pointed to by <i>s</i> (if
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<i>s</i> is not a null pointer). At most {MB_CUR_MAX} bytes shall be stored. If <i>wchar</i> is 0, a null byte shall be stored,
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preceded by any shift sequence needed to restore the initial shift state, and <i>wctomb</i>() shall be left in the initial shift
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state.</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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behavior of this function is affected by the <i>LC_CTYPE</i> category of the current locale. For a state-dependent encoding, this
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function shall be placed into its initial state by a call for which its character pointer argument, <i>s</i>, is a null pointer.
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Subsequent calls with <i>s</i> as other than a null pointer shall cause the internal state of the function to be altered as
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necessary. A call with <i>s</i> as a null pointer shall cause this function to return a non-zero value if encodings have state
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dependency, and 0 otherwise. Changing the <i>LC_CTYPE</i> category causes the shift state of this function to be unspecified.</p>
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<p>The <i>wctomb</i>() function need not be reentrant. A function that is not required to be reentrant is not required to be
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thread-safe. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p>
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<p>The implementation shall behave as if no function defined in this volume of IEEE Std 1003.1-2001 calls
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<i>wctomb</i>().</p>
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</blockquote>
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<h4><a name="tag_03_855_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If <i>s</i> is a null pointer, <i>wctomb</i>() shall return a non-zero or 0 value, if character encodings, respectively, do or
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do not have state-dependent encodings. If <i>s</i> is not a null pointer, <i>wctomb</i>() shall return -1 if the value of
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<i>wchar</i> does not correspond to a valid character, or return the number of bytes that constitute the character corresponding to
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the value of <i>wchar</i>.</p>
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<p>In no case shall the value returned be greater than the value of the {MB_CUR_MAX} macro.</p>
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</blockquote>
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<h4><a name="tag_03_855_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_855_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_855_07"></a>APPLICATION USAGE</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_855_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_855_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_855_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="mblen.html"><i>mblen</i>()</a> , <a href="mbtowc.html"><i>mbtowc</i>()</a> , <a href=
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"mbstowcs.html"><i>mbstowcs</i>()</a> , <a href="wcstombs.html"><i>wcstombs</i>()</a> , the Base Definitions volume of
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IEEE Std 1003.1-2001, <a href="../basedefs/stdlib.h.html"><i><stdlib.h></i></a></p>
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</blockquote>
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<h4><a name="tag_03_855_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4. Derived from the ANSI C standard.</p>
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</blockquote>
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<h4><a name="tag_03_855_12"></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>In the DESCRIPTION, a note about reentrancy and thread-safety is added.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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