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106 lines
4.3 KiB
HTML
106 lines
4.3 KiB
HTML
4 years ago
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<title>wcstombs (The Red Hat newlib C Library)</title>
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Stdlib.html#Stdlib" rel="up" title="Stdlib">
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<body lang="en">
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<a name="wcstombs"></a>
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<div class="header">
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<p>
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Next: <a href="wctomb.html#wctomb" accesskey="n" rel="next">wctomb</a>, Previous: <a href="utoa.html#utoa" accesskey="p" rel="prev">utoa</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="wcstombs_002d_002d_002dminimal-wide-char-string-to-multibyte-string-converter"></a>
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<h3 class="section">2.50 <code>wcstombs</code>—minimal wide char string to multibyte string converter</h3>
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<a name="index-wcstombs"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <stdlib.h>
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size_t wcstombs(char *restrict <var>s</var>, const wchar_t *restrict <var>pwc</var>, size_t <var>n</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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When _MB_CAPABLE is not defined, this is a minimal ANSI-conforming
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implementation of <code>wcstombs</code>. In this case,
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all wide-characters are expected to represent single bytes and so
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are converted simply by casting to char.
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</p>
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<p>When _MB_CAPABLE is defined, this routine calls <code>_wcstombs_r</code> to perform
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the conversion, passing a state variable to allow state dependent
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decoding. The result is based on the locale setting which may
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be restricted to a defined set of locales.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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This implementation of <code>wcstombs</code> returns <code>0</code> if
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<var>s</var> is <code>NULL</code> or is the empty string;
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it returns <code>-1</code> if _MB_CAPABLE and one of the
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wide-char characters does not represent a valid multi-byte character;
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otherwise it returns the minimum of: <code>n</code> or the
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number of bytes that are transferred to <code>s</code>, not including the
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nul terminator.
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</p>
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<p>If the return value is -1, the state of the <code>pwc</code> string is
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indeterminate. If the input has a length of 0, the output
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string will be modified to contain a wchar_t nul terminator if
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<code>n</code> > 0.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>wcstombs</code> is required in the ANSI C standard. However, the precise
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effects vary with the locale.
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</p>
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<p><code>wcstombs</code> requires no supporting OS subroutines.
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</p>
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<br>
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</html>
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