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101 lines
4.3 KiB
HTML
101 lines
4.3 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>fsetpos (The Red Hat newlib C Library)</title>
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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="_005f_005ffsetlocking.html#g_t_005f_005ffsetlocking" rel="prev" title="__fsetlocking">
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</head>
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<body lang="en">
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<a name="fsetpos"></a>
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<div class="header">
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<p>
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Next: <a href="ftell.html#ftell" accesskey="n" rel="next">ftell</a>, Previous: <a href="_005f_005ffsetlocking.html#g_t_005f_005ffsetlocking" accesskey="p" rel="prev">__fsetlocking</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="fsetpos_002d_002d_002drestore-position-of-a-stream-or-file"></a>
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<h3 class="section">4.28 <code>fsetpos</code>—restore position of a stream or file</h3>
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<a name="index-fsetpos"></a>
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<a name="index-_005ffsetpos_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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int fsetpos(FILE *<var>fp</var>, const fpos_t *<var>pos</var>);
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int _fsetpos_r(struct _reent *<var>ptr</var>, FILE *<var>fp</var>,
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const fpos_t *<var>pos</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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Objects of type <code>FILE</code> can have a “position” that records how much
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of the file your program has already read. Many of the <code>stdio</code> functions
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depend on this position, and many change it as a side effect.
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</p>
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<p>You can use <code>fsetpos</code> to return the file identified by <var>fp</var> to a previous
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position <code>*<var>pos</var></code> (after first recording it with <code>fgetpos</code>).
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</p>
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<p>See <code>fseek</code> for a similar facility.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>fgetpos</code> returns <code>0</code> when successful. If <code>fgetpos</code> fails, the
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result is <code>1</code>. The reason for failure is indicated in <code>errno</code>:
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either <code>ESPIPE</code> (the stream identified by <var>fp</var> doesn’t support
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repositioning) or <code>EINVAL</code> (invalid file position).
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</p>
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<br>
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<p><strong>Portability</strong><br>
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ANSI C requires <code>fsetpos</code>, but does not specify the nature of
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<code>*<var>pos</var></code> beyond identifying it as written by <code>fgetpos</code>.
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</p>
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<p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>,
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<code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>.
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</p>
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<br>
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</body>
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</html>
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