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| <h3 class="section">4.44 <code>putc</code>—write a character (macro)</h3> |
| |
| <p><a name="index-putc-246"></a><a name="index-g_t_005fputc_005fr-247"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| int putc(int <var>ch</var>, FILE *<var>fp</var>); |
| |
| #include <stdio.h> |
| int _putc_r(struct _reent *<var>ptr</var>, int <var>ch</var>, FILE *<var>fp</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>putc</code> is a macro, defined in <code>stdio.h</code>. <code>putc</code> |
| writes the argument <var>ch</var> to the file or stream identified by |
| <var>fp</var>, after converting it from an <code>int</code> to an <code>unsigned char</code>. |
| |
| <p>If the file was opened with append mode (or if the stream cannot |
| support positioning), then the new character goes at the end of the |
| file or stream. Otherwise, the new character is written at the |
| current value of the position indicator, and the position indicator |
| advances by one. |
| |
| <p>For a subroutine version of this macro, see <code>fputc</code>. |
| |
| <p>The <code>_putc_r</code> function is simply the reentrant version of |
| <code>putc</code> that takes an additional reentrant structure argument: <var>ptr</var>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| If successful, <code>putc</code> returns its argument <var>ch</var>. If an error |
| intervenes, the result is <code>EOF</code>. You can use `<code>ferror(</code><var>fp</var><code>)</code>' to |
| query for errors. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C requires <code>putc</code>; it suggests, but does not require, that |
| <code>putc</code> be implemented as a macro. The standard explicitly permits |
| macro implementations of <code>putc</code> to use the <var>fp</var> argument more than once; |
| therefore, in a portable program, you should not use an expression |
| with side effects as this argument. |
| |
| <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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