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107 lines
4.5 KiB
HTML
107 lines
4.5 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>mbtowc (The Red Hat newlib C Library)</title>
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<meta name="description" content="mbtowc (The Red Hat newlib C Library)">
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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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<link href="on_005fexit.html#on_005fexit" rel="next" title="on_exit">
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</head>
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<body lang="en">
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<a name="mbtowc"></a>
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<div class="header">
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<p>
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Next: <a href="on_005fexit.html#on_005fexit" accesskey="n" rel="next">on_exit</a>, Previous: <a href="mbstowcs.html#mbstowcs" accesskey="p" rel="prev">mbstowcs</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="mbtowc_002d_002d_002dminimal-multibyte-to-wide-char-converter"></a>
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<h3 class="section">2.30 <code>mbtowc</code>—minimal multibyte to wide char converter</h3>
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<a name="index-mbtowc"></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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int mbtowc(wchar_t *restrict <var>pwc</var>, const char *restrict <var>s</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>mbtowc</code>. In this case,
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only “multi-byte character sequences” recognized are single bytes,
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and they are “converted” to themselves.
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Each call to <code>mbtowc</code> copies one character from <code>*<var>s</var></code> to
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<code>*<var>pwc</var></code>, unless <var>s</var> is a null pointer. The argument n
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is ignored.
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</p>
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<p>When _MB_CAPABLE is defined, this routine calls <code>_mbtowc_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>mbtowc</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 not _MB_CAPABLE or
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the character is a single-byte character; it returns <code>-1</code>
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if n is <code>0</code> or the multi-byte character is invalid;
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otherwise it returns the number of bytes in the multibyte character.
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If the return value is -1, no changes are made to the <code>pwc</code>
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output string. If the input is the empty string, a wchar_t nul
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is placed in the output string and 0 is returned. If the input
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has a length of 0, no changes are made to the <code>pwc</code> output string.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>mbtowc</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>mbtowc</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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