176 lines
7.2 KiB
HTML
176 lines
7.2 KiB
HTML
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<title>wcsrtombs</title>
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<basefont size="3"> <a name="wcsrtombs"></a> <a name="tag_03_839"></a><!-- wcsrtombs -->
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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_839_01"></a>NAME</h4>
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<blockquote>wcsrtombs - convert a wide-character string to a character string (restartable)</blockquote>
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<h4><a name="tag_03_839_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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size_t wcsrtombs(char *restrict</tt> <i>dst</i><tt>, const wchar_t **restrict</tt> <i>src</i><tt>,<br>
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size_t</tt> <i>len</i><tt>, mbstate_t *restrict</tt> <i>ps</i><tt>);<br>
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</tt></code></p>
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</blockquote>
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<h4><a name="tag_03_839_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>wcsrtombs</i>() function shall convert a sequence of wide characters from the array indirectly pointed to by <i>src</i>
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into a sequence of corresponding characters, beginning in the conversion state described by the object pointed to by <i>ps</i>. If
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<i>dst</i> is not a null pointer, the converted characters shall then be stored into the array pointed to by <i>dst</i>. Conversion
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continues up to and including a terminating null wide character, which shall also be stored. Conversion shall stop earlier in the
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following cases:</p>
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<ul>
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<li>
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<p>When a code is reached that does not correspond to a valid character</p>
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</li>
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<li>
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<p>When the next character would exceed the limit of <i>len</i> total bytes to be stored in the array pointed to by <i>dst</i> (and
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<i>dst</i> is not a null pointer)</p>
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</li>
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</ul>
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<p>Each conversion shall take place as if by a call to the <a href="../functions/wcrtomb.html"><i>wcrtomb</i>()</a> function.</p>
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<p>If <i>dst</i> is not a null pointer, the pointer object pointed to by <i>src</i> shall be assigned either a null pointer (if
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conversion stopped due to reaching a terminating null wide character) or the address just past the last wide character converted
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(if any). If conversion stopped due to reaching a terminating null wide character, the resulting state described shall be the
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initial conversion state.</p>
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<p>If <i>ps</i> is a null pointer, the <i>wcsrtombs</i>() function shall use its own internal <b>mbstate_t</b> object, which is
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initialized at program start-up to the initial conversion state. Otherwise, the <b>mbstate_t</b> object pointed to by <i>ps</i>
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shall be used to completely describe the current conversion state of the associated character sequence. The implementation shall
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behave as if no function defined in this volume of IEEE Std 1003.1-2001 calls <i>wcsrtombs</i>().</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"> If
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the application uses any of the _POSIX_THREAD_SAFE_FUNCTIONS or _POSIX_THREADS functions, the application shall ensure that the
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<i>wcsrtombs</i>() function is called with a non-NULL <i>ps</i> argument. <img src="../images/opt-end.gif" alt="[Option End]"
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border="0"></p>
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<p>The behavior of this function shall be affected by the <i>LC_CTYPE</i> category of the current locale.</p>
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</blockquote>
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<h4><a name="tag_03_839_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If conversion stops because a code is reached that does not correspond to a valid character, an encoding error occurs. In this
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case, the <i>wcsrtombs</i>() function shall store the value of the macro [EILSEQ] in <i>errno</i> and return (<b>size_t</b>)-1; the
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conversion state is undefined. Otherwise, it shall return the number of bytes in the resulting character sequence, not including
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the terminating null (if any).</p>
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</blockquote>
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<h4><a name="tag_03_839_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>wcsrtombs</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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<i>ps</i> points to an object that contains an invalid conversion state. <img src="../images/opt-end.gif" alt="[Option End]"
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border="0"></dd>
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<dt>[EILSEQ]</dt>
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<dd>A wide-character code does not correspond to a valid character.</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_839_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_839_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_839_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_839_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_839_10"></a>SEE ALSO</h4>
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<blockquote>
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<p><a href="mbsinit.html"><i>mbsinit</i>()</a> , <a href="wcrtomb.html"><i>wcrtomb</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_839_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 5. Included for alignment with ISO/IEC 9899:1990/Amendment 1:1995 (E).</p>
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</blockquote>
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<h4><a name="tag_03_839_12"></a>Issue 6</h4>
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<blockquote>
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<p>In the DESCRIPTION, a note on using this function in a threaded application is added.</p>
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<p>Extensions beyond the ISO C standard are marked.</p>
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<p>The DESCRIPTION is updated to avoid use of the term "must" for application requirements.</p>
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<p>The <i>wcsrtombs</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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