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110 lines
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110 lines
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<a name="putc"></a>
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<div class="header">
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<p>
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Next: <a href="putc_005funlocked.html#putc_005funlocked" accesskey="n" rel="next">putc_unlocked</a>, Previous: <a href="perror.html#perror" accesskey="p" rel="prev">perror</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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<hr>
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<a name="putc_002d_002d_002dwrite-a-character-_0028macro_0029"></a>
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<h3 class="section">4.45 <code>putc</code>—write a character (macro)</h3>
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<a name="index-putc"></a>
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<a name="index-_005fputc_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 putc(int <var>ch</var>, FILE *<var>fp</var>);
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#include <stdio.h>
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int _putc_r(struct _reent *<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>putc</code> is a macro, defined in <code>stdio.h</code>. <code>putc</code>
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writes the argument <var>ch</var> to the file or stream identified by
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<var>fp</var>, after converting it from an <code>int</code> to an <code>unsigned char</code>.
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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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advances by one.
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</p>
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<p>For a subroutine version of this macro, see <code>fputc</code>.
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</p>
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<p>The <code>_putc_r</code> function is simply the reentrant version of
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<code>putc</code> that takes 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>putc</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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ANSI C requires <code>putc</code>; it suggests, but does not require, that
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<code>putc</code> be implemented as a macro. The standard explicitly permits
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macro implementations of <code>putc</code> to use the <var>fp</var> argument more than once;
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therefore, in a portable program, you should not use an expression
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with side effects as this argument.
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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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