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1 " |
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2 COPYRIGHT (c) 1989-93 by Claus Gittinger |
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3 All Rights Reserved |
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4 |
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5 This software is furnished under a license and may be used |
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6 only in accordance with the terms of that license and with the |
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7 inclusion of the above copyright notice. This software may not |
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8 be provided or otherwise made available to, or used by, any |
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9 other person. No title to or ownership of the software is |
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10 hereby transferred. |
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11 " |
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12 |
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13 FileStream subclass:#DirectoryStream |
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14 instanceVariableNames:'dirPointer readAhead' |
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15 classVariableNames:'' |
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16 poolDictionaries:'' |
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17 category:'Streams-External' |
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18 ! |
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19 |
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20 DirectoryStream comment:' |
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21 |
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22 COPYRIGHT (c) 1989-93 by Claus Gittinger |
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23 All Rights Reserved |
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24 |
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25 %W% %E% |
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26 '! |
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27 |
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28 %{ |
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29 #include <stdio.h> |
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30 #ifndef transputer |
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31 # include <sys/types.h> |
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32 # include <sys/stat.h> |
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33 # ifdef OPENDIR |
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34 # include <sys/types.h> |
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35 # ifdef NEXT |
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36 # include <sys/dir.h> |
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37 # else |
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38 # include <dirent.h> |
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39 # endif |
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40 # endif |
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41 #endif |
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42 %} |
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43 |
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44 !DirectoryStream methodsFor:'instance release'! |
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45 |
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46 closeFile |
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47 "a directoryStream has been collected - close it" |
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48 %{ |
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49 #ifdef OPENDIR |
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50 closedir((DIR *)MKFD(_INST(dirPointer))); |
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51 #endif |
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52 %} |
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53 ! ! |
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54 |
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55 !DirectoryStream class methodsFor:'instance creation'! |
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56 |
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57 directoryNamed:dirName |
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58 "return a DirectoryStream for directory named dirName, aString" |
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59 |
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60 |newStream| |
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61 |
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62 newStream := (self basicNew) pathName:dirName. |
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63 newStream openForReading isNil ifTrue:[^nil]. |
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64 ^ newStream |
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65 ! ! |
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66 |
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67 !DirectoryStream methodsFor:'access reading'! |
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68 |
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69 nextLine |
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70 "return the next filename as a string" |
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71 |
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72 |prevEntry nextEntry| |
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73 %{ |
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74 #ifdef OPENDIR |
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75 DIR *d; |
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76 #ifdef NEXT |
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77 struct direct *dp; |
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78 #else |
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79 struct dirent *dp; |
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80 #endif |
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81 |
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82 if (_INST(dirPointer) != nil) { |
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83 d = (DIR *)MKFD(_INST(dirPointer)); |
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84 dp = readdir(d); |
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85 if (dp != NULL) { |
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86 nextEntry = _MKSTRING((char *)(dp->d_name) COMMA_CON); |
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87 } |
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88 } |
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89 #endif |
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90 %} |
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91 . |
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92 prevEntry := readAhead. |
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93 readAhead := nextEntry. |
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94 ^ prevEntry |
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95 ! ! |
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96 |
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97 !DirectoryStream methodsFor:'private'! |
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98 |
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99 openForReading |
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100 "open the file for readonly" |
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101 |
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102 |retVal| |
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103 |
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104 mode := #readonly. |
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105 %{ |
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106 #ifdef OPENDIR |
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107 DIR *d; |
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108 OBJ path; |
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109 extern OBJ ErrorNumber, ErrorString; |
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110 extern errno; |
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111 |
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112 retVal = false; |
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113 if (_INST(dirPointer) == nil) { |
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114 path = _INST(pathName); |
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115 if (_isString(path)) { |
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116 d = opendir((char *) _stringVal(path)); |
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117 if (d == NULL) { |
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118 /* ErrorString = _MKSTRING(perror("popen:") COMMA_CON); */ |
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119 ErrorNumber = _MKSMALLINT(errno); |
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120 } else { |
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121 _INST(dirPointer) = MKOBJ(d); |
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122 retVal = true; |
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123 } |
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124 } |
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125 } |
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126 #endif |
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127 %} |
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128 . |
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129 retVal isNil ifTrue:[ |
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130 "opendir not avalable - use slow pipe" |
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131 ^ PipeStream readingFrom:('cd ' , pathName , '; ls -a') |
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132 ]. |
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133 (retVal == true) ifTrue:[ |
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134 lobby register:self. |
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135 self nextLine. "read 1st entry into readAhead buffer" |
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136 ^ self |
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137 ]. |
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138 ^ nil |
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139 ! |
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140 |
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141 reOpen |
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142 "sent after snapin to reopen streams" |
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143 |
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144 filePointer notNil ifTrue:[ |
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145 "it was open, when snapped-out" |
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146 filePointer := nil. |
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147 'cannot reopen directorystream' printNewline |
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148 ] |
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149 ! ! |
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150 |
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151 !DirectoryStream methodsFor:'testing'! |
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152 |
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153 atEnd |
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154 "return true, if position is at end" |
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155 |
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156 ^ readAhead == nil |
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157 ! ! |
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158 |
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159 !DirectoryStream methodsFor:'closing'! |
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160 |
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161 close |
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162 "close the stream - tell operating system" |
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163 |
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164 dirPointer notNil ifTrue:[ |
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165 lobby unregister:self. |
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166 self closeFile. |
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167 dirPointer := nil |
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168 ] |
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169 ! ! |