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| <h3 class="section">4.46 <code>putchar</code>—write a character (macro)</h3> |
| |
| <p><a name="index-putchar-250"></a><a name="index-g_t_005fputchar_005fr-251"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| int putchar(int <var>ch</var>); |
| |
| int _putchar_r(struct _reent *<var>reent</var>, int <var>ch</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>putchar</code> is a macro, defined in <code>stdio.h</code>. <code>putchar</code> |
| writes its argument to the standard output stream, |
| after converting it from an <code>int</code> to an <code>unsigned char</code>. |
| |
| <p>The alternate function <code>_putchar_r</code> is a reentrant version. The |
| extra argument <var>reent</var> is a pointer to a reentrancy structure. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| If successful, <code>putchar</code> returns its argument <var>ch</var>. If an error |
| intervenes, the result is <code>EOF</code>. You can use `<code>ferror(stdin)</code>' to |
| query for errors. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C requires <code>putchar</code>; it suggests, but does not require, that |
| <code>putchar</code> be implemented as a macro. |
| |
| <p>Supporting OS subroutines required: <code>close</code>, <code>fstat</code>, <code>isatty</code>, |
| <code>lseek</code>, <code>read</code>, <code>sbrk</code>, <code>write</code>. |
| |
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