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132 lines
5.6 KiB
HTML
132 lines
5.6 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>fputc (The Red Hat newlib C Library)</title>
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<meta name="description" content="fputc (The Red Hat newlib C Library)">
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<meta name="keywords" content="fputc (The Red Hat newlib C Library)">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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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="fputs.html#fputs" rel="next" title="fputs">
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</head>
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<body lang="en">
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<a name="fputc"></a>
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<div class="header">
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<p>
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Next: <a href="fputs.html#fputs" accesskey="n" rel="next">fputs</a>, Previous: <a href="fpurge.html#fpurge" accesskey="p" rel="prev">fpurge</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="fputc_002c-fputc_005funlocked_002d_002d_002dwrite-a-character-on-a-stream-or-file"></a>
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<h3 class="section">4.20 <code>fputc</code>, <code>fputc_unlocked</code>—write a character on a stream or file</h3>
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<a name="index-fputc"></a>
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<a name="index-fputc_005funlocked"></a>
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<a name="index-_005ffputc_005fr"></a>
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<a name="index-_005ffputc_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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int fputc(int <var>ch</var>, FILE *<var>fp</var>);
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#define _BSD_SOURCE
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#include <stdio.h>
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int fputc_unlocked(int <var>ch</var>, FILE *<var>fp</var>);
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#include <stdio.h>
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int _fputc_r(struct _rent *<var>ptr</var>, int <var>ch</var>, FILE *<var>fp</var>);
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#include <stdio.h>
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int _fputc_unlocked_r(struct _rent *<var>ptr</var>, int <var>ch</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>fputc</code> converts the argument <var>ch</var> from an <code>int</code> to an
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<code>unsigned char</code>, then writes it to the file or stream identified by
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<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 character goes at the end of the
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file or stream. Otherwise, the new 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>For a macro version of this function, see <code>putc</code>.
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</p>
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<p><code>fputc_unlocked</code> is a non-thread-safe version of <code>fputc</code>.
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<code>fputc_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>fputc_unlocked</code> is equivalent to <code>fputc</code>.
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</p>
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<p>The <code>_fputc_r</code> and <code>_fputc_unlocked_r</code> functions are simply reentrant
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versions of the above that take an additional reentrant structure
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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>fputc</code> returns its argument <var>ch</var>. If an error
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intervenes, the result is <code>EOF</code>. You can use ‘<code>ferror(<var>fp</var>)</code>’ to
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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>fputc</code> is required by ANSI C.
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</p>
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<p><code>fputc_unlocked</code> is a BSD extension also provided by GNU libc.
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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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<hr>
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<div class="header">
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<p>
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Next: <a href="fputs.html#fputs" accesskey="n" rel="next">fputs</a>, Previous: <a href="fpurge.html#fpurge" accesskey="p" rel="prev">fpurge</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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