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121 lines
4.9 KiB
HTML
121 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>fgetws (The Red Hat newlib C Library)</title>
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<meta name="description" content="fgetws (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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</head>
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<body lang="en">
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<a name="fgetws"></a>
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<div class="header">
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<p>
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Next: <a href="fileno.html#fileno" accesskey="n" rel="next">fileno</a>, Previous: <a href="fgetwc.html#fgetwc" accesskey="p" rel="prev">fgetwc</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="fgetws_002c-fgetws_005funlocked_002d_002d_002dget-wide-character-string-from-a-file-or-stream"></a>
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<h3 class="section">4.14 <code>fgetws</code>, <code>fgetws_unlocked</code>—get wide character string from a file or stream</h3>
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<a name="index-fgetws"></a>
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<a name="index-fgetws_005funlocked"></a>
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<a name="index-_005ffgetws_005fr"></a>
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<a name="index-_005ffgetws_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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wchar_t *fgetws(wchar_t *__restrict <var>ws</var>, int <var>n</var>,
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FILE *__restrict <var>fp</var>);
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#define _GNU_SOURCE
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#include <wchar.h>
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wchar_t *fgetws_unlocked(wchar_t *__restrict <var>ws</var>, int <var>n</var>,
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FILE *__restrict <var>fp</var>);
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#include <wchar.h>
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wchar_t *_fgetws_r(struct _reent *<var>ptr</var>, wchar_t *<var>ws</var>,
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int <var>n</var>, FILE *<var>fp</var>);
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#include <wchar.h>
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wchar_t *_fgetws_unlocked_r(struct _reent *<var>ptr</var>, wchar_t *<var>ws</var>,
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int <var>n</var>, FILE *<var>fp</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Reads at most <var>n-1</var> wide characters from <var>fp</var> until a newline
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is found. The wide characters including to the newline are stored
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in <var>ws</var>. The buffer is terminated with a 0.
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</p>
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<p><code>fgetws_unlocked</code> is a non-thread-safe version of <code>fgetws</code>.
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<code>fgetws_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>fgetws_unlocked</code> is equivalent to <code>fgetws</code>.
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</p>
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<p>The <code>_fgetws_r</code> and <code>_fgetws_unlocked_r</code> functions are simply reentrant
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version of the above and are passed an additional reentrancy structure
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pointer: <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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<code>fgetws</code> returns the buffer passed to it, with the data
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filled in. If end of file occurs with some data already
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accumulated, the data is returned with no other indication. If
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no data are read, NULL is returned instead.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>fgetws</code> is required by C99 and POSIX.1-2001.
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</p>
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<p><code>fgetws_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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