You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
4.4 KiB
HTML
107 lines
4.4 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>fwide (The Red Hat newlib C Library)</title>
|
|
|
|
<meta name="description" content="fwide (The Red Hat newlib C Library)">
|
|
<meta name="keywords" content="fwide (The Red Hat newlib C Library)">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
|
|
<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="Stdio.html#Stdio" rel="up" title="Stdio">
|
|
<link href="fwrite.html#fwrite" rel="next" title="fwrite">
|
|
<link href="funopen.html#funopen" rel="prev" title="funopen">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="fwide"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="fwrite.html#fwrite" accesskey="n" rel="next">fwrite</a>, Previous: <a href="funopen.html#funopen" accesskey="p" rel="prev">funopen</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>
|
|
</div>
|
|
<hr>
|
|
<a name="fwide_002d_002d_002dset-and-determine-the-orientation-of-a-FILE-stream"></a>
|
|
<h3 class="section">4.31 <code>fwide</code>—set and determine the orientation of a FILE stream</h3>
|
|
<a name="index-fwide"></a>
|
|
<a name="index-_005ffwide_005fr"></a>
|
|
<p><strong>Synopsis</strong>
|
|
</p><div class="example">
|
|
<pre class="example">#include <wchar.h>
|
|
int fwide(FILE *<var>fp</var>, int <var>mode</var>);
|
|
|
|
int _fwide_r(struct _reent *<var>ptr</var>, FILE *<var>fp</var>, int <var>mode</var>);
|
|
|
|
</pre></div>
|
|
<p><strong>Description</strong><br>
|
|
When <var>mode</var> is zero, the <code>fwide</code> function determines the current
|
|
orientation of <var>fp</var>. It returns a value > 0 if <var>fp</var> is
|
|
wide-character oriented, i.e. if wide character I/O is permitted but
|
|
char I/O is disallowed. It returns a value < 0 if <var>fp</var> is byte
|
|
oriented, i.e. if char I/O is permitted but wide character I/O is
|
|
disallowed. It returns zero if <var>fp</var> has no orientation yet; in
|
|
this case the next I/O operation might change the orientation (to byte
|
|
oriented if it is a char I/O operation, or to wide-character oriented
|
|
if it is a wide character I/O operation).
|
|
</p>
|
|
<p>Once a stream has an orientation, it cannot be changed and persists
|
|
until the stream is closed, unless the stream is re-opened with freopen,
|
|
which removes the orientation of the stream.
|
|
</p>
|
|
<p>When <var>mode</var> is non-zero, the <code>fwide</code> function first attempts to set
|
|
<var>fp</var>’s orientation (to wide-character oriented if <var>mode</var> > 0, or to
|
|
byte oriented if <var>mode</var> < 0). It then returns a value denoting the
|
|
current orientation, as above.
|
|
</p>
|
|
<br>
|
|
<p><strong>Returns</strong><br>
|
|
The <code>fwide</code> function returns <var>fp</var>’s orientation, after possibly
|
|
changing it. A return value > 0 means wide-character oriented. A return
|
|
value < 0 means byte oriented. A return value of zero means undecided.
|
|
</p>
|
|
<br>
|
|
<p><strong>Portability</strong><br>
|
|
C99, POSIX.1-2001.
|
|
</p>
|
|
|
|
<br>
|
|
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|