4.104.114.84.95
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1 | /* |
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2 | * getdents() - Get Directory Entries |
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3 | * |
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4 | * SVR4 and SVID extension required by Newlib readdir() family. |
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5 | * |
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6 | * This routine will dd_len / (sizeof dirent) directory entries relative to |
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7 | * the current directory position index. These entries will be placed in |
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8 | * character array pointed to by -dd_buf- |
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9 | * |
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10 | * COPYRIGHT (c) 1989-1999. |
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11 | * On-Line Applications Research Corporation (OAR). |
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12 | * |
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13 | * The license and distribution terms for this file may be |
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14 | * found in the file LICENSE in this distribution or at |
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15 | * http://www.OARcorp.com/rtems/license.html. |
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16 | * |
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17 | * $Id$ |
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18 | */ |
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19 | |
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20 | #include <errno.h> |
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21 | |
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22 | #include "libio_.h" |
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23 | |
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24 | int getdents( |
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25 | int dd_fd, |
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26 | char *dd_buf, |
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27 | int dd_len |
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28 | ) |
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29 | { |
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30 | rtems_libio_t *iop; |
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31 | rtems_filesystem_location_info_t loc; |
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32 | |
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33 | /* |
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34 | * Get the file control block structure associated with the file descriptor |
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35 | */ |
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36 | |
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37 | iop = rtems_libio_iop( dd_fd ); |
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38 | |
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39 | /* |
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40 | * Make sure we are working on a directory |
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41 | */ |
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42 | loc = iop->pathinfo; |
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43 | if ( !loc.ops->node_type ) |
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44 | set_errno_and_return_minus_one( ENOTSUP ); |
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45 | |
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46 | if ( (*loc.ops->node_type)( &loc ) != RTEMS_FILESYSTEM_DIRECTORY ) |
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47 | set_errno_and_return_minus_one( ENOTDIR ); |
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48 | |
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49 | /* |
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50 | * Return the number of bytes that were actually transfered as a result |
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51 | * of the read attempt. |
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52 | */ |
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53 | |
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54 | if ( !iop->handlers->read ) |
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55 | set_errno_and_return_minus_one( ENOTSUP ); |
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56 | |
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57 | return (*iop->handlers->read)( iop, dd_buf, dd_len ); |
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58 | } |
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