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| <h2 id="fcb_append"><font color="F2853F" style="font-size:24pt">fcb_append</font></h2> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>int fcb_append(struct fcb *fcb, uint16_t len, struct fcb_entry *append_loc); |
| </code></pre></div> |
| |
| <p>Start writing a new element to flash. This routine reserves the space in the flash by writing out the element header.</p> |
| <p>When writing the contents for the entry, use append_loc->fl_area and append_loc->fl_data_off as arguments to flash_area_write(). When finished, call fcb_append_finish() with append_loc as argument.</p> |
| <h4 id="arguments">Arguments</h4> |
| <table> |
| <thead> |
| <tr> |
| <th>Arguments</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>fcb</td> |
| <td>Points to FCB where data is written to.</td> |
| </tr> |
| <tr> |
| <td>len</td> |
| <td>Number of bytes to reserve for the element.</td> |
| </tr> |
| <tr> |
| <td>loc</td> |
| <td>Pointer to fcb_entry. fcb_append() will fill this with info about where the element can be written to.</td> |
| </tr> |
| </tbody> |
| </table> |
| <h4 id="returned-values">Returned values</h4> |
| <p>Returns 0 on success; nonzero on failure. |
| FCB_ERR_NOSPACE is returned if FCB is full.</p> |
| <h4 id="notes">Notes</h4> |
| <p>If FCB is full, you need to make more space. This can be done by calling fcb_rotate(). Or if you've reserved scratch sectors, you can take those into use by calling fcb_append_to_scratch().</p> |
| <h4 id="example">Example</h4> |
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