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155 lines
6.6 KiB
HTML
155 lines
6.6 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>fputwc (The Red Hat newlib C Library)</title>
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<meta name="description" content="fputwc (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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<link href="fputws.html#fputws" rel="next" title="fputws">
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<body lang="en">
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<a name="fputwc"></a>
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<div class="header">
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<p>
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Next: <a href="fputws.html#fputws" accesskey="n" rel="next">fputws</a>, Previous: <a href="fputs.html#fputs" accesskey="p" rel="prev">fputs</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="fputwc_002c-putwc_002c-fputwc_005funlocked_002c-putwc_005funlocked_002d_002d_002dwrite-a-wide-character-on-a-stream-or-file"></a>
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<h3 class="section">4.22 <code>fputwc</code>, <code>putwc</code>, <code>fputwc_unlocked</code>, <code>putwc_unlocked</code>—write a wide character on a stream or file</h3>
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<a name="index-fputwc"></a>
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<a name="index-fputwc_005funlocked"></a>
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<a name="index-_005ffputwc_005fr"></a>
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<a name="index-_005ffputwc_005funlocked_005fr"></a>
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<a name="index-putwc"></a>
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<a name="index-putwc_005funlocked"></a>
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<a name="index-_005fputwc_005fr"></a>
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<a name="index-_005fputwc_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 fputwc(wchar_t <var>wc</var>, 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 fputwc_unlocked(wchar_t <var>wc</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 _fputwc_r(struct _reent *<var>ptr</var>, wchar_t <var>wc</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 _fputwc_unlocked_r(struct _reent *<var>ptr</var>, wchar_t <var>wc</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 putwc(wchar_t <var>wc</var>, 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 putwc_unlocked(wchar_t <var>wc</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 _putwc_r(struct _reent *<var>ptr</var>, wchar_t <var>wc</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 _putwc_unlocked_r(struct _reent *<var>ptr</var>, wchar_t <var>wc</var>, FILE *<var>fp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>fputwc</code> writes the wide character argument <var>wc</var> to the file or
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stream identified by <var>fp</var>.
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</p>
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<p>If the file was opened with append mode (or if the stream cannot
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support positioning), then the new wide character goes at the end of the
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file or stream. Otherwise, the new wide character is written at the
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current value of the position indicator, and the position indicator
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oadvances by one.
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</p>
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<p><code>fputwc_unlocked</code> is a non-thread-safe version of <code>fputwc</code>.
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<code>fputwc_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>fputwc_unlocked</code> is equivalent to <code>fputwc</code>.
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</p>
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<p>The <code>putwc</code> and <code>putwc_unlocked</code> functions or macros function identically
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to <code>fputwc</code> and <code>fputwc_unlocked</code>. They 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 them.
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</p>
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<p>The <code>_fputwc_r</code>, <code>_putwc_r</code>, <code>_fputwc_unlocked_r</code>, and
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<code>_putwc_unlocked_r</code> functions are simply reentrant versions of the above
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that take an additional reentrant structure 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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If successful, <code>fputwc</code> and <code>putwc</code> return their argument <var>wc</var>.
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If an error intervenes, the result is <code>EOF</code>. You can use
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‘<code>ferror(<var>fp</var>)</code>’ to query for errors.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>fputwc</code> and <code>putwc</code> are required by C99 and POSIX.1-2001.
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</p>
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<p><code>fputwc_unlocked</code> and <code>putwc_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="fputws.html#fputws" accesskey="n" rel="next">fputws</a>, Previous: <a href="fputs.html#fputs" accesskey="p" rel="prev">fputs</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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</body>
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</html>
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