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120 lines
4.9 KiB
HTML
120 lines
4.9 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>getwchar (The Red Hat newlib C Library)</title>
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<meta name="description" content="getwchar (The Red Hat newlib C Library)">
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<meta name="keywords" content="getwchar (The Red Hat newlib C Library)">
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<link href="index.html#Top" rel="start" title="Top">
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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="Stdio.html#Stdio" rel="up" title="Stdio">
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<link href="mktemp.html#mktemp" rel="next" title="mktemp">
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<body lang="en">
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<a name="getwchar"></a>
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<div class="header">
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<p>
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Next: <a href="mktemp.html#mktemp" accesskey="n" rel="next">mktemp</a>, Previous: <a href="getw.html#getw" accesskey="p" rel="prev">getw</a>, Up: <a href="Stdio.html#Stdio" accesskey="u" rel="up">Stdio</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="getwchar_002c-getwchar_005funlocked_002d_002d_002dread-a-wide-character-from-standard-input"></a>
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<h3 class="section">4.41 <code>getwchar</code>, <code>getwchar_unlocked</code>—read a wide character from standard input</h3>
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<a name="index-getwchar"></a>
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<a name="index-getwchar_005funlocked"></a>
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<a name="index-_005fgetwchar_005fr"></a>
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<a name="index-_005fgetwchar_005funlocked_005fr"></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 <wchar.h>
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wint_t getwchar(void);
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#define _GNU_SOURCE
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#include <wchar.h>
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wint_t getwchar_unlocked(void);
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#include <wchar.h>
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wint_t _getwchar_r(struct _reent *<var>reent</var>);
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#include <wchar.h>
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wint_t _getwchar_unlocked_r(struct _reent *<var>reent</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>getwchar</code> function or macro is the wide character equivalent of
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the <code>getchar</code> function. You can use <code>getwchar</code> to get the next
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wide character from the standard input stream. As a side effect,
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<code>getwchar</code> advances the standard input’s current position indicator.
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</p>
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<p><code>getwchar_unlocked</code> is a non-thread-safe version of <code>getwchar</code>.
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<code>getwchar_unlocked</code> may only safely be used within a scope
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protected by flockfile() (or ftrylockfile()) and funlockfile(). This
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function may safely be used in a multi-threaded program if and only
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if they are called while the invoking thread owns the (FILE *)
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object, as is the case after a successful call to the flockfile() or
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ftrylockfile() functions. If threads are disabled, then
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<code>getwchar_unlocked</code> is equivalent to <code>getwchar</code>.
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</p>
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<p>The alternate functions <code>_getwchar_r</code> and <code>_getwchar_unlocked_r</code> are
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reentrant versions of the above. The extra argument <var>reent</var> is a pointer to
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a reentrancy structure.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The next wide character cast to <code>wint_t</code>, unless there is no more
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data, or the host system reports a read error; in either of these
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situations, <code>getwchar</code> returns <code>WEOF</code>.
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</p>
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<p>You can distinguish the two situations that cause an <code>WEOF</code> result by
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using ‘<code>ferror(stdin)</code>’ and ‘<code>feof(stdin)</code>’.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>getwchar</code> is required by C99.
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</p>
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<p><code>getwchar_unlocked</code> is a GNU extension.
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</p>
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<br>
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</body>
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</html>
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