151 lines
6.1 KiB
HTML
151 lines
6.1 KiB
HTML
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<title>mbstowcs</title>
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<basefont size="3"> <a name="mbstowcs"></a> <a name="tag_03_363"></a><!-- mbstowcs -->
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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_363_01"></a>NAME</h4>
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<blockquote>mbstowcs - convert a character string to a wide-character string</blockquote>
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<h4><a name="tag_03_363_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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size_t mbstowcs(wchar_t *restrict</tt> <i>pwcs</i><tt>, const char *restrict</tt> <i>s</i><tt>,<br>
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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_363_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>mbstowcs</i>() function shall convert a sequence of characters that begins in the initial shift state from the array
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pointed to by <i>s</i> into a sequence of corresponding wide-character codes and shall store not more than <i>n</i> wide-character
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codes into the array pointed to by <i>pwcs</i>. No characters that follow a null byte (which is converted into a wide-character
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code with value 0) shall be examined or converted. Each character shall be converted as if by a call to <a href=
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"../functions/mbtowc.html"><i>mbtowc</i>()</a>, except that the shift state of <a href=
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"../functions/mbtowc.html"><i>mbtowc</i>()</a> is not affected.</p>
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<p>No more than <i>n</i> elements shall be modified in the array pointed to by <i>pwcs</i>. If copying takes place between objects
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that overlap, the behavior is undefined.</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. <sup>[<a href=
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"javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> If
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<i>pwcs</i> is a null pointer, <i>mbstowcs</i>() shall return the length required to convert the entire array regardless of the
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value of <i>n</i>, but no values are stored. <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_363_04"></a>RETURN VALUE</h4>
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<blockquote>
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<p>If an invalid character is encountered, <i>mbstowcs</i>() shall return (<b>size_t</b>)-1 <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"> and may set
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<i>errno</i> to indicate the error. <img src="../images/opt-end.gif" alt="[Option End]" border="0"></p>
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<p>Otherwise, <i>mbstowcs</i>() shall return the number of the array elements modified <sup>[<a href=
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"javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0"> (or required
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if <i>pwcs</i> is null), <img src="../images/opt-end.gif" alt="[Option End]" border="0"> not including a terminating 0 code, if
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any. The array shall not be zero-terminated if the value returned is <i>n</i>.</p>
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</blockquote>
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<h4><a name="tag_03_363_05"></a>ERRORS</h4>
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<blockquote>
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<p>The <i>mbstowcs</i>() function may fail if:</p>
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<dl compact>
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<dt>[EILSEQ]</dt>
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<dd><sup>[<a href="javascript:open_code('XSI')">XSI</a>]</sup> <img src="../images/opt-start.gif" alt="[Option Start]" border="0">
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Invalid byte sequence is detected. <img src="../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_363_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_363_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_363_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_363_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_363_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="wctomb.html"><i>wctomb</i>()</a>
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, <a href="wcstombs.html"><i>wcstombs</i>()</a> , 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_363_11"></a>CHANGE HISTORY</h4>
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<blockquote>
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<p>First released in Issue 4. Aligned with the ISO C standard.</p>
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</blockquote>
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<h4><a name="tag_03_363_12"></a>Issue 6</h4>
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<blockquote>
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<p>The <i>mbstowcs</i>() prototype is updated for alignment with the ISO/IEC 9899:1999 standard.</p>
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<p>Extensions beyond the ISO C standard are marked.</p>
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</blockquote>
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<div class="box"><em>End of informative text.</em></div>
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