1<html lang="en"> 2<head> 3<title>wcstombs - Untitled</title> 4<meta http-equiv="Content-Type" content="text/html"> 5<meta name="description" content="Untitled"> 6<meta name="generator" content="makeinfo 4.13"> 7<link title="Top" rel="start" href="index.html#Top"> 8<link rel="up" href="Stdlib.html#Stdlib" title="Stdlib"> 9<link rel="prev" href="system.html#system" title="system"> 10<link rel="next" href="wctomb.html#wctomb" title="wctomb"> 11<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> 12<meta http-equiv="Content-Style-Type" content="text/css"> 13<style type="text/css"><!-- 14 pre.display { font-family:inherit } 15 pre.format { font-family:inherit } 16 pre.smalldisplay { font-family:inherit; font-size:smaller } 17 pre.smallformat { font-family:inherit; font-size:smaller } 18 pre.smallexample { font-size:smaller } 19 pre.smalllisp { font-size:smaller } 20 span.sc { font-variant:small-caps } 21 span.roman { font-family:serif; font-weight:normal; } 22 span.sansserif { font-family:sans-serif; font-weight:normal; } 23--></style> 24<link rel="stylesheet" type="text/css" href="../cs.css"> 25</head> 26<body> 27<div class="node"> 28<a name="wcstombs"></a> 29<p> 30Next: <a rel="next" accesskey="n" href="wctomb.html#wctomb">wctomb</a>, 31Previous: <a rel="previous" accesskey="p" href="system.html#system">system</a>, 32Up: <a rel="up" accesskey="u" href="Stdlib.html#Stdlib">Stdlib</a> 33<hr> 34</div> 35 36<h3 class="section">2.46 <code>wcstombs</code>—minimal wide char string to multibyte string converter</h3> 37 38<p><a name="index-wcstombs-108"></a><strong>Synopsis</strong> 39<pre class="example"> #include <stdlib.h> 40 size_t wcstombs(char *<var>s</var>, const wchar_t *<var>pwc</var>, size_t <var>n</var>); 41 42</pre> 43 <p><strong>Description</strong><br> 44When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming 45implementation of <code>wcstombs</code>. In this case, 46all wide-characters are expected to represent single bytes and so 47are converted simply by casting to char. 48 49 <p>When _MB_CAPABLE is defined, this routine calls <code>_wcstombs_r</code> to perform 50the conversion, passing a state variable to allow state dependent 51decoding. The result is based on the locale setting which may 52be restricted to a defined set of locales. 53 54 <p><br> 55<strong>Returns</strong><br> 56This implementation of <code>wcstombs</code> returns <code>0</code> if 57<var>s</var> is <code>NULL</code> or is the empty string; 58it returns <code>-1</code> if _MB_CAPABLE and one of the 59wide-char characters does not represent a valid multi-byte character; 60otherwise it returns the minimum of: <code>n</code> or the 61number of bytes that are transferred to <code>s</code>, not including the 62nul terminator. 63 64 <p>If the return value is -1, the state of the <code>pwc</code> string is 65indeterminate. If the input has a length of 0, the output 66string will be modified to contain a wchar_t nul terminator if 67<code>n</code> > 0. 68 69 <p><br> 70<strong>Portability</strong><br> 71<code>wcstombs</code> is required in the ANSI C standard. However, the precise 72effects vary with the locale. 73 74 <p><code>wcstombs</code> requires no supporting OS subroutines. 75 76 <p><br> 77 78 </body></html> 79 80