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153 lines
6.4 KiB
HTML
153 lines
6.4 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>fgetwc (The Red Hat newlib C Library)</title>
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<meta name="description" content="fgetwc (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="Stdio.html#Stdio" rel="up" title="Stdio">
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<body lang="en">
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<a name="fgetwc"></a>
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<div class="header">
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<p>
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Next: <a href="fgetws.html#fgetws" accesskey="n" rel="next">fgetws</a>, Previous: <a href="fgets.html#fgets" accesskey="p" rel="prev">fgets</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="fgetwc_002c-getwc_002c-fgetwc_005funlocked_002c-getwc_005funlocked_002d_002d_002dget-a-wide-character-from-a-file-or-stream"></a>
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<h3 class="section">4.13 <code>fgetwc</code>, <code>getwc</code>, <code>fgetwc_unlocked</code>, <code>getwc_unlocked</code>—get a wide character from a file or stream</h3>
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<a name="index-fgetwc"></a>
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<a name="index-fgetwc_005funlocked"></a>
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<a name="index-_005ffgetwc_005fr"></a>
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<a name="index-_005ffgetwc_005funlocked_005fr"></a>
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<a name="index-getwc"></a>
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<a name="index-getwc_005funlocked"></a>
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<a name="index-_005fgetwc_005fr"></a>
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<a name="index-_005fgetwc_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 <stdio.h>
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#include <wchar.h>
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wint_t fgetwc(FILE *<var>fp</var>);
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <wchar.h>
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wint_t fgetwc_unlocked(FILE *<var>fp</var>);
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#include <stdio.h>
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#include <wchar.h>
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wint_t _fgetwc_r(struct _reent *<var>ptr</var>, FILE *<var>fp</var>);
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#include <stdio.h>
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#include <wchar.h>
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wint_t _fgetwc_unlocked_r(struct _reent *<var>ptr</var>, FILE *<var>fp</var>);
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#include <stdio.h>
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#include <wchar.h>
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wint_t getwc(FILE *<var>fp</var>);
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <wchar.h>
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wint_t getwc_unlocked(FILE *<var>fp</var>);
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#include <stdio.h>
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#include <wchar.h>
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wint_t _getwc_r(struct _reent *<var>ptr</var>, FILE *<var>fp</var>);
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#include <stdio.h>
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#include <wchar.h>
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wint_t _getwc_unlocked_r(struct _reent *<var>ptr</var>, FILE *<var>fp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Use <code>fgetwc</code> to get the next wide character from the file or stream
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identified by <var>fp</var>. As a side effect, <code>fgetwc</code> advances the file’s
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current position indicator.
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</p>
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<p><code>fgetwc_unlocked</code> is a non-thread-safe version of <code>fgetwc</code>.
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<code>fgetwc_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>fgetwc_unlocked</code> is equivalent to <code>fgetwc</code>.
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</p>
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<p>The <code>getwc</code> and <code>getwc_unlocked</code> functions or macros functions identically
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to <code>fgetwc</code> and <code>fgetwc_unlocked</code>. It may be implemented as a macro, and
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may evaluate its argument more than once. There is no reason ever to use it.
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</p>
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<p><code>_fgetwc_r</code>, <code>_getwc_r</code>, <code>_fgetwc_unlocked_r</code>, and <code>_getwc_unlocked_r</code>
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are simply reentrant versions of the above functions that are passed the
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additional reentrant structure pointer argument: <var>ptr</var>.
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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 data,
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or the host system reports a read error; in either of these situations,
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<code>fgetwc</code> and <code>getwc</code> return <code>WEOF</code>.
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</p>
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<p>You can distinguish the two situations that cause an <code>EOF</code> result by
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using the <code>ferror</code> and <code>feof</code> functions.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>fgetwc</code> and <code>getwc</code> are required by C99 and POSIX.1-2001.
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</p>
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<p><code>fgetwc_unlocked</code> and <code>getwc_unlocked</code> are GNU extensions.
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</p>
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<br>
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<hr>
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<div class="header">
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<p>
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Next: <a href="fgetws.html#fgetws" accesskey="n" rel="next">fgetws</a>, Previous: <a href="fgets.html#fgets" accesskey="p" rel="prev">fgets</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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