1 | /* |
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2 | * rtems_filesystem_evaluate_path() |
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3 | * |
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4 | * Routine to seed the evaluate path routine. |
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5 | * |
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6 | * COPYRIGHT (c) 1989-1999. |
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7 | * On-Line Applications Research Corporation (OAR). |
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8 | * |
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9 | * The license and distribution terms for this file may be |
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10 | * found in the file LICENSE in this distribution or at |
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11 | * http://www.rtems.com/license/LICENSE. |
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12 | * |
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13 | * $Id$ |
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14 | */ |
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15 | |
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16 | #if HAVE_CONFIG_H |
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17 | #include "config.h" |
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18 | #endif |
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19 | |
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20 | #include <rtems.h> |
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21 | #include <rtems/libio_.h> |
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22 | #include <rtems/seterr.h> |
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23 | |
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24 | int rtems_filesystem_evaluate_path( |
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25 | const char *pathname, |
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26 | int flags, |
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27 | rtems_filesystem_location_info_t *pathloc, |
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28 | int follow_link |
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29 | ) |
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30 | { |
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31 | int i; |
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32 | int result; |
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33 | rtems_filesystem_node_types_t type; |
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34 | |
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35 | /* |
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36 | * Verify Input parameters. |
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37 | */ |
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38 | |
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39 | if ( !pathname ) |
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40 | rtems_set_errno_and_return_minus_one( EFAULT ); |
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41 | |
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42 | if ( !pathloc ) |
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43 | rtems_set_errno_and_return_minus_one( EIO ); /* should never happen */ |
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44 | |
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45 | /* |
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46 | * Evaluate the path using the optable evalpath. |
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47 | */ |
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48 | |
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49 | rtems_filesystem_get_start_loc( pathname, &i, pathloc ); |
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50 | |
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51 | if ( !pathloc->ops->evalpath_h ) |
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52 | rtems_set_errno_and_return_minus_one( ENOTSUP ); |
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53 | |
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54 | result = (*pathloc->ops->evalpath_h)( &pathname[i], flags, pathloc ); |
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55 | |
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56 | /* |
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57 | * Get the Node type and determine if you need to follow the link or |
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58 | * not. |
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59 | */ |
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60 | |
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61 | if ( (result == 0) && follow_link ) { |
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62 | |
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63 | if ( !pathloc->ops->node_type_h ){ |
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64 | rtems_filesystem_freenode( pathloc ); |
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65 | rtems_set_errno_and_return_minus_one( ENOTSUP ); |
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66 | } |
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67 | |
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68 | type = (*pathloc->ops->node_type_h)( pathloc ); |
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69 | |
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70 | if ( ( type == RTEMS_FILESYSTEM_HARD_LINK ) || |
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71 | ( type == RTEMS_FILESYSTEM_SYM_LINK ) ) { |
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72 | |
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73 | if ( !pathloc->ops->eval_link_h ){ |
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74 | rtems_filesystem_freenode( pathloc ); |
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75 | rtems_set_errno_and_return_minus_one( ENOTSUP ); |
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76 | } |
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77 | |
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78 | /* what to do with the valid node pathloc points to |
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79 | * if eval_link_h fails? |
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80 | * Let the FS implementation deal with this case. It |
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81 | * should probably free pathloc in either case: |
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82 | * - if the link evaluation fails, it must free the |
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83 | * original (valid) pathloc because we are going |
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84 | * to return -1 and hence the FS generics won't |
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85 | * cleanup pathloc. |
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86 | * - if the link evaluation is successful, the updated |
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87 | * pathloc will be passed up (and eventually released). |
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88 | * Hence, the (valid) originial node that we submit to |
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89 | * eval_link_h() should be released by the handler. |
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90 | */ |
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91 | |
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92 | result = (*pathloc->ops->eval_link_h)( pathloc, flags ); |
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93 | |
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94 | } |
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95 | } |
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96 | |
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97 | return result; |
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98 | } |
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99 | |
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100 | |
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101 | int rtems_filesystem_evaluate_parent( |
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102 | int flags, |
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103 | rtems_filesystem_location_info_t *pathloc |
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104 | ) |
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105 | { |
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106 | rtems_filesystem_location_info_t parent; |
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107 | int result; |
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108 | |
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109 | if ( !pathloc ) |
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110 | rtems_set_errno_and_return_minus_one( EIO ); /* should never happen */ |
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111 | |
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112 | if ( !pathloc->ops->evalpath_h ) |
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113 | rtems_set_errno_and_return_minus_one( ENOTSUP ); |
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114 | |
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115 | parent = *pathloc; |
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116 | result = (*pathloc->ops->evalpath_h)( "..", flags, &parent ); |
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117 | if (result != 0){ |
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118 | return -1; |
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119 | } |
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120 | rtems_filesystem_freenode( &parent ); |
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121 | |
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122 | return result; |
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123 | } |
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124 | |
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