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| <h3 class="section">4.27 <code>fsetpos</code>—restore position of a stream or file</h3> |
| |
| <p><a name="index-fsetpos-202"></a><a name="index-g_t_005ffsetpos_005fr-203"></a><strong>Synopsis</strong> |
| <pre class="example"> #include <stdio.h> |
| int fsetpos(FILE *<var>fp</var>, const fpos_t *<var>pos</var>); |
| int _fsetpos_r(struct _reent *<var>ptr</var>, FILE *<var>fp</var>, |
| const fpos_t *<var>pos</var>); |
| |
| </pre> |
| <p><strong>Description</strong><br> |
| Objects of type <code>FILE</code> can have a “position” that records how much |
| of the file your program has already read. Many of the <code>stdio</code> functions |
| depend on this position, and many change it as a side effect. |
| |
| <p>You can use <code>fsetpos</code> to return the file identified by <var>fp</var> to a previous |
| position <code>*</code><var>pos</var> (after first recording it with <code>fgetpos</code>). |
| |
| <p>See <code>fseek</code> for a similar facility. |
| |
| <p><br> |
| <strong>Returns</strong><br> |
| <code>fgetpos</code> returns <code>0</code> when successful. If <code>fgetpos</code> fails, the |
| result is <code>1</code>. The reason for failure is indicated in <code>errno</code>: |
| either <code>ESPIPE</code> (the stream identified by <var>fp</var> doesn't support |
| repositioning) or <code>EINVAL</code> (invalid file position). |
| |
| <p><br> |
| <strong>Portability</strong><br> |
| ANSI C requires <code>fsetpos</code>, but does not specify the nature of |
| <code>*</code><var>pos</var> beyond identifying it as written by <code>fgetpos</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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