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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>wcsrtombs</title></head><body bgcolor=white><center><font size=2>The Single UNIX ® Specification, Version 2<br>Copyright © 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_010_590"> </a>NAME</h4><blockquote>wcsrtombs - convert a wide-character string to a character string(restartable)</blockquote><h4><a name = "tag_000_010_591"> </a>SYNOPSIS</h4><blockquote><pre><code>#include <<a href="wchar.h.html">wchar.h</a>>size_t wcsrtombs(char *<i>dst</i>, const wchar_t **<i>src</i>, size_t <i>len</i>, mbstate_t *<i>ps</i>);</code></pre></blockquote><h4><a name = "tag_000_010_592"> </a>DESCRIPTION</h4><blockquote>The<i>wcsrtombs()</i>function converts a sequence of wide-characters from the arrayindirectly pointed to by<i>src</i>into a sequence of corresponding characters, beginning inthe conversion state described by the object pointed to by<i>ps</i>.If<i>dst</i>is not a null pointer, the converted characters are then stored intothe array pointed to by<i>dst</i>.Conversion continues up to and including a terminating null wide-character, which is also stored. Conversion stops earlier in thefollowing cases:<ul><p><li>When a code is reached that does not correspond to a valid character.<p><li>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<i>dst</i>is not a null pointer).<p></ul><p>Each conversion takes place as if by a call to the<i><a href="wcrtomb.html">wcrtomb()</a></i>function.<p>If<i>dst</i>is not a null pointer, the pointer object pointed to by<i>src</i>is assigned either a null pointer (if conversion stopped due toreaching a terminating null wide-character) or the address just past the last wide-character converted (if any). If conversionstopped due to reaching a terminating null wide-character, theresulting state described is the initial conversion state.<p>If<i>ps</i>is a null pointer, the<i>wcsrtombs()</i>function uses its own internal<b>mbstate_t</b>object, which is initialised at program startup to the initialconversion state. Otherwise, the <b>mbstate_t</b>object pointed to by<i>ps</i>is used to completely describe the current conversion state of theassociated character sequence.The implementation will behave as if no function defined in thisspecification calls<i>wcsrtombs()</i>.<p>The behaviour of this function is affected by the LC_CTYPE category ofthe current locale. </blockquote><h4><a name = "tag_000_010_593"> </a>RETURN VALUE</h4><blockquote>If conversion stops because a code is reached that does not correspondto a valid character, an encoding error occurs. In thiscase, the<i>wcsrtombs()</i>function stores the value of the macro EILSEQ in<i>errno</i>and returns<b>(size_t)-1</b>;the conversion state is undefined. Otherwise, it returns the numberof bytes in the resulting character sequence, notincluding the terminating null (if any).</blockquote><h4><a name = "tag_000_010_594"> </a>ERRORS</h4><blockquote>The<i>wcsrtombs()</i>function may fail if:<dl compact><dt>[EINVAL]<dd><i>ps</i>points to an object that contains an invalid conversion state.<dt>[EILSEQ]<dd>A wide-character code does not correspond to a valid character.</dl></blockquote><h4><a name = "tag_000_010_595"> </a>EXAMPLES</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_596"> </a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_597"> </a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_010_598"> </a>SEE ALSO</h4><blockquote><i><a href="mbsinit.html">mbsinit()</a></i>,<i><a href="wcrtomb.html">wcrtomb()</a></i>,<i><a href="wchar.h.html"><wchar.h></a></i>.</blockquote><h4>DERIVATION</h4><blockquote>Derived from the ISO/IEC 9899:1990/Amendment 1:1995 (E).</blockquote><hr size=2 noshade><center><font size=2>UNIX ® is a registered Trademark of The Open Group.<br>Copyright © 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>⌨️ 快捷键说明
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