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| <h3 class="section">4.20 <code>fputc</code>—write a character on a stream or file</h3> |
| |
| <p><a name="index-fputc-184"></a><a name="index-g_t_005ffputc_005fr-185"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| int fputc(int <var>ch</var>, FILE *<var>fp</var>); |
| |
| #include <stdio.h> |
| int _fputc_r(struct _rent *<var>ptr</var>, int <var>ch</var>, FILE *<var>fp</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>fputc</code> converts the argument <var>ch</var> from an <code>int</code> to an |
| <code>unsigned char</code>, then writes it to the file or stream identified by |
| <var>fp</var>. |
| |
| <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 |
| oadvances by one. |
| |
| <p>For a macro version of this function, see <code>putc</code>. |
| |
| <p>The <code>_fputc_r</code> function is simply a reentrant version of <code>fputc</code> |
| that takes an additional reentrant structure argument: <var>ptr</var>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| If successful, <code>fputc</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> |
| <code>fputc</code> is required by ANSI C. |
| |
| <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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