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| <h3 class="section">4.31 <code>fwrite</code>—write array elements</h3> |
| |
| <p><a name="index-fwrite-213"></a><a name="index-g_t_005ffwrite_005fr-214"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| size_t fwrite(const void *<var>buf</var>, size_t <var>size</var>, |
| size_t <var>count</var>, FILE *<var>fp</var>); |
| |
| #include <stdio.h> |
| size_t _fwrite_r(struct _reent *<var>ptr</var>, const void *<var>buf</var>, size_t <var>size</var>, |
| size_t <var>count</var>, FILE *<var>fp</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| <code>fwrite</code> attempts to copy, starting from the memory location |
| <var>buf</var>, <var>count</var> elements (each of size <var>size</var>) into the file or |
| stream identified by <var>fp</var>. <code>fwrite</code> may copy fewer elements than |
| <var>count</var> if an error intervenes. |
| |
| <p><code>fwrite</code> also advances the file position indicator (if any) for |
| <var>fp</var> by the number of <em>characters</em> actually written. |
| |
| <p><code>_fwrite_r</code> is simply the reentrant version of <code>fwrite</code> that |
| takes an additional reentrant structure argument: <var>ptr</var>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| If <code>fwrite</code> succeeds in writing all the elements you specify, the |
| result is the same as the argument <var>count</var>. In any event, the |
| result is the number of complete elements that <code>fwrite</code> copied to |
| the file. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C requires <code>fwrite</code>. |
| |
| <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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