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| <h3 class="section">4.24 <code>fread</code>—read array elements from a file</h3> |
| |
| <p><a name="index-fread-194"></a><a name="index-g_t_005ffread_005fr-195"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| size_t fread(void *<var>buf</var>, size_t <var>size</var>, size_t <var>count</var>, |
| FILE *<var>fp</var>); |
| |
| #include <stdio.h> |
| size_t _fread_r(struct _reent *<var>ptr</var>, 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>fread</code> attempts to copy, from the file or stream identified by |
| <var>fp</var>, <var>count</var> elements (each of size <var>size</var>) into memory, |
| starting at <var>buf</var>. <code>fread</code> may copy fewer elements than |
| <var>count</var> if an error, or end of file, intervenes. |
| |
| <p><code>fread</code> also advances the file position indicator (if any) for |
| <var>fp</var> by the number of <em>characters</em> actually read. |
| |
| <p><code>_fread_r</code> is simply the reentrant version of <code>fread</code> that |
| takes an additional reentrant structure pointer argument: <var>ptr</var>. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| The result of <code>fread</code> is the number of elements it succeeded in |
| reading. |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C requires <code>fread</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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