1 | /* File tree walker functions. |
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2 | Copyright (C) 1996,1997,1998,1999,2000,2001 Free Software Foundation, Inc. |
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3 | This file is part of the GNU C Library. |
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4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996. |
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5 | |
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6 | The GNU C Library is free software; you can redistribute it and/or |
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7 | modify it under the terms of the GNU Lesser General Public |
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8 | License as published by the Free Software Foundation; either |
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9 | version 2.1 of the License, or (at your option) any later version. |
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10 | |
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11 | The GNU C Library is distributed in the hope that it will be useful, |
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12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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14 | Lesser General Public License for more details. |
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15 | |
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16 | You should have received a copy of the GNU Lesser General Public |
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17 | License along with the GNU C Library; if not, write to the Free |
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18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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19 | 02111-1307 USA. */ |
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20 | |
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21 | /* Modified for newlib by Jeff Johnston, July 26, 2002 */ |
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22 | |
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23 | #define _GNU_SOURCE 1 |
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24 | |
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25 | #include <dirent.h> |
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26 | #include <errno.h> |
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27 | #include <ftw.h> |
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28 | #include <search.h> |
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29 | #include <stdlib.h> |
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30 | #include <string.h> |
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31 | #include <unistd.h> |
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32 | #include <sys/param.h> |
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33 | #include <sys/stat.h> |
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34 | |
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35 | extern struct dirent64 *__readdir64 (DIR *); |
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36 | |
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37 | /* #define NDEBUG 1 */ |
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38 | #include <assert.h> |
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39 | |
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40 | /* Support for the LFS API version. */ |
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41 | #ifndef FTW_NAME |
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42 | # define FTW_NAME ftw |
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43 | # define NFTW_NAME nftw |
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44 | # define INO_T ino_t |
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45 | # define STAT stat |
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46 | # define LXSTAT lstat |
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47 | # define XSTAT stat |
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48 | # define FTW_FUNC_T __ftw_func_t |
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49 | # define NFTW_FUNC_T __nftw_func_t |
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50 | #endif |
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51 | |
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52 | #define dirfd(x) ((x)->dd_fd) |
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53 | |
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54 | struct dir_data |
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55 | { |
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56 | DIR *stream; |
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57 | char *content; |
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58 | }; |
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59 | |
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60 | struct known_object |
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61 | { |
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62 | dev_t dev; |
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63 | INO_T ino; |
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64 | }; |
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65 | |
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66 | struct ftw_data |
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67 | { |
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68 | /* Array with pointers to open directory streams. */ |
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69 | struct dir_data **dirstreams; |
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70 | size_t actdir; |
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71 | size_t maxdir; |
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72 | |
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73 | /* Buffer containing name of currently processed object. */ |
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74 | char *dirbuf; |
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75 | size_t dirbufsize; |
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76 | |
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77 | /* Passed as fourth argument to `nftw' callback. The `base' member |
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78 | tracks the content of the `dirbuf'. */ |
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79 | struct FTW ftw; |
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80 | |
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81 | /* Flags passed to `nftw' function. 0 for `ftw'. */ |
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82 | int flags; |
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83 | |
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84 | /* Conversion array for flag values. It is the identity mapping for |
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85 | `nftw' calls, otherwise it maps the values to those know by |
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86 | `ftw'. */ |
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87 | const int *cvt_arr; |
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88 | |
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89 | /* Callback function. We always use the `nftw' form. */ |
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90 | NFTW_FUNC_T func; |
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91 | |
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92 | /* Device of starting point. Needed for FTW_MOUNT. */ |
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93 | dev_t dev; |
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94 | |
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95 | /* Data structure for keeping fingerprints of already processed |
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96 | object. This is needed when not using FTW_PHYS. */ |
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97 | void *known_objects; |
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98 | }; |
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99 | |
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100 | |
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101 | /* Internally we use the FTW_* constants used for `nftw'. When the |
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102 | process called `ftw' we must reduce the flag to the known flags |
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103 | for `ftw'. */ |
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104 | static const int nftw_arr[] = |
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105 | { |
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106 | FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN |
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107 | }; |
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108 | |
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109 | static const int ftw_arr[] = |
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110 | { |
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111 | FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_F, FTW_D, FTW_NS |
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112 | }; |
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113 | |
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114 | |
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115 | /* Forward declarations of local functions. */ |
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116 | static int ftw_dir (struct ftw_data *data, struct STAT *st); |
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117 | |
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118 | |
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119 | static int |
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120 | object_compare (const void *p1, const void *p2) |
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121 | { |
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122 | /* We don't need a sophisticated and useful comparison. We are only |
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123 | interested in equality. However, we must be careful not to |
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124 | accidentally compare `holes' in the structure. */ |
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125 | const struct known_object *kp1 = p1, *kp2 = p2; |
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126 | int cmp1; |
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127 | cmp1 = (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev); |
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128 | if (cmp1 != 0) |
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129 | return cmp1; |
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130 | return (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino); |
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131 | } |
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132 | |
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133 | |
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134 | static inline int |
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135 | add_object (struct ftw_data *data, struct STAT *st) |
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136 | { |
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137 | struct known_object *newp = malloc (sizeof (struct known_object)); |
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138 | if (newp == NULL) |
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139 | return -1; |
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140 | newp->dev = st->st_dev; |
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141 | newp->ino = st->st_ino; |
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142 | return tsearch (newp, &data->known_objects, object_compare) ? 0 : -1; |
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143 | } |
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144 | |
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145 | |
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146 | static inline int |
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147 | find_object (struct ftw_data *data, struct STAT *st) |
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148 | { |
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149 | struct known_object obj = { dev: st->st_dev, ino: st->st_ino }; |
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150 | return tfind (&obj, &data->known_objects, object_compare) != NULL; |
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151 | } |
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152 | |
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153 | |
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154 | static inline int |
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155 | open_dir_stream (struct ftw_data *data, struct dir_data *dirp) |
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156 | { |
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157 | int result = 0; |
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158 | |
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159 | if (data->dirstreams[data->actdir] != NULL) |
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160 | { |
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161 | /* Oh, oh. We must close this stream. Get all remaining |
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162 | entries and store them as a list in the `content' member of |
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163 | the `struct dir_data' variable. */ |
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164 | size_t bufsize = 1024; |
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165 | char *buf = malloc (bufsize); |
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166 | |
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167 | if (buf == NULL) |
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168 | result = -1; |
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169 | else |
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170 | { |
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171 | DIR *st = data->dirstreams[data->actdir]->stream; |
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172 | struct dirent64 *d; |
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173 | size_t actsize = 0; |
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174 | |
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175 | while ((d = __readdir64 (st)) != NULL) |
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176 | { |
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177 | size_t this_len = strlen (d->d_name); |
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178 | if (actsize + this_len + 2 >= bufsize) |
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179 | { |
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180 | char *newp; |
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181 | bufsize += MAX (1024, 2 * this_len); |
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182 | newp = realloc (buf, bufsize); |
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183 | if (newp == NULL) |
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184 | { |
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185 | /* No more memory. */ |
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186 | int save_err = errno; |
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187 | free (buf); |
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188 | __set_errno (save_err); |
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189 | result = -1; |
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190 | break; |
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191 | } |
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192 | buf = newp; |
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193 | } |
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194 | |
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195 | *((char *) mempcpy (buf + actsize, d->d_name, this_len)) |
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196 | = '\0'; |
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197 | actsize += this_len + 1; |
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198 | } |
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199 | |
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200 | /* Terminate the list with an additional NUL byte. */ |
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201 | buf[actsize++] = '\0'; |
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202 | |
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203 | /* Shrink the buffer to what we actually need. */ |
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204 | data->dirstreams[data->actdir]->content = realloc (buf, actsize); |
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205 | if (data->dirstreams[data->actdir]->content == NULL) |
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206 | { |
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207 | int save_err = errno; |
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208 | free (buf); |
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209 | __set_errno (save_err); |
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210 | result = -1; |
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211 | } |
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212 | else |
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213 | { |
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214 | closedir (st); |
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215 | data->dirstreams[data->actdir]->stream = NULL; |
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216 | data->dirstreams[data->actdir] = NULL; |
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217 | } |
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218 | } |
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219 | } |
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220 | |
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221 | /* Open the new stream. */ |
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222 | if (result == 0) |
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223 | { |
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224 | assert (data->dirstreams[data->actdir] == NULL); |
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225 | |
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226 | dirp->stream = opendir (data->dirbuf); |
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227 | if (dirp->stream == NULL) |
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228 | result = -1; |
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229 | else |
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230 | { |
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231 | dirp->content = NULL; |
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232 | data->dirstreams[data->actdir] = dirp; |
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233 | |
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234 | if (++data->actdir == data->maxdir) |
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235 | data->actdir = 0; |
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236 | } |
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237 | } |
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238 | |
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239 | return result; |
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240 | } |
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241 | |
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242 | |
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243 | static inline int |
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244 | process_entry (struct ftw_data *data, struct dir_data *dir, const char *name, |
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245 | size_t namlen) |
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246 | { |
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247 | struct STAT st; |
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248 | int result = 0; |
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249 | int flag = 0; |
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250 | |
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251 | if (name[0] == '.' && (name[1] == '\0' |
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252 | || (name[1] == '.' && name[2] == '\0'))) |
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253 | /* Don't process the "." and ".." entries. */ |
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254 | return 0; |
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255 | |
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256 | if (data->dirbufsize < data->ftw.base + namlen + 2) |
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257 | { |
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258 | /* Enlarge the buffer. */ |
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259 | char *newp; |
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260 | |
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261 | data->dirbufsize *= 2; |
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262 | newp = realloc (data->dirbuf, data->dirbufsize); |
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263 | if (newp == NULL) |
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264 | return -1; |
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265 | data->dirbuf = newp; |
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266 | } |
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267 | |
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268 | *((char *) mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0'; |
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269 | |
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270 | if (((data->flags & FTW_PHYS) |
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271 | ? LXSTAT (data->dirbuf, &st) |
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272 | : XSTAT (data->dirbuf, &st)) < 0) |
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273 | { |
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274 | if (errno != EACCES && errno != ENOENT) |
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275 | result = -1; |
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276 | else if (!(data->flags & FTW_PHYS) |
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277 | && LXSTAT (data->dirbuf, &st) == 0 |
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278 | && S_ISLNK (st.st_mode)) |
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279 | flag = FTW_SLN; |
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280 | else |
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281 | flag = FTW_NS; |
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282 | } |
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283 | else |
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284 | { |
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285 | if (S_ISDIR (st.st_mode)) |
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286 | flag = FTW_D; |
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287 | else if (S_ISLNK (st.st_mode)) |
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288 | flag = FTW_SL; |
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289 | else |
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290 | flag = FTW_F; |
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291 | } |
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292 | |
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293 | if (result == 0 |
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294 | && (flag == FTW_NS |
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295 | || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev)) |
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296 | { |
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297 | if (flag == FTW_D) |
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298 | { |
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299 | if ((data->flags & FTW_PHYS) |
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300 | || (!find_object (data, &st) |
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301 | /* Remember the object. */ |
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302 | && (result = add_object (data, &st)) == 0)) |
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303 | { |
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304 | result = ftw_dir (data, &st); |
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305 | |
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306 | if (result == 0 && (data->flags & FTW_CHDIR)) |
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307 | { |
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308 | /* Change back to current directory. */ |
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309 | int done = 0; |
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310 | if (dir->stream != NULL) |
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311 | if (fchdir (dirfd (dir->stream)) == 0) |
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312 | done = 1; |
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313 | |
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314 | if (!done) |
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315 | { |
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316 | if (data->ftw.base == 1) |
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317 | { |
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318 | if (chdir ("/") < 0) |
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319 | result = -1; |
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320 | } |
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321 | else |
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322 | { |
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323 | /* Please note that we overwrite a slash. */ |
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324 | data->dirbuf[data->ftw.base - 1] = '\0'; |
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325 | |
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326 | if (chdir (data->dirbuf) < 0) |
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327 | result = -1; |
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328 | |
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329 | data->dirbuf[data->ftw.base - 1] = '/'; |
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330 | } |
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331 | } |
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332 | } |
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333 | } |
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334 | } |
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335 | else |
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336 | result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag], |
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337 | &data->ftw); |
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338 | } |
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339 | |
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340 | return result; |
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341 | } |
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342 | |
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343 | |
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344 | static int |
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345 | ftw_dir (struct ftw_data *data, struct STAT *st) |
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346 | { |
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347 | struct dir_data dir; |
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348 | struct dirent64 *d; |
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349 | int previous_base = data->ftw.base; |
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350 | int result; |
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351 | char *startp; |
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352 | |
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353 | /* Open the stream for this directory. This might require that |
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354 | another stream has to be closed. */ |
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355 | result = open_dir_stream (data, &dir); |
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356 | if (result != 0) |
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357 | { |
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358 | if (errno == EACCES) |
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359 | /* We cannot read the directory. Signal this with a special flag. */ |
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360 | result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw); |
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361 | |
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362 | return result; |
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363 | } |
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364 | |
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365 | /* First, report the directory (if not depth-first). */ |
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366 | if (!(data->flags & FTW_DEPTH)) |
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367 | { |
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368 | result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw); |
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369 | if (result != 0) |
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370 | return result; |
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371 | } |
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372 | |
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373 | /* If necessary, change to this directory. */ |
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374 | if (data->flags & FTW_CHDIR) |
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375 | { |
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376 | if (fchdir (dirfd (dir.stream)) < 0) |
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377 | { |
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378 | if (errno == ENOSYS) |
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379 | { |
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380 | if (chdir (data->dirbuf) < 0) |
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381 | result = -1; |
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382 | } |
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383 | else |
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384 | result = -1; |
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385 | } |
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386 | |
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387 | if (result != 0) |
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388 | { |
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389 | int save_err = errno; |
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390 | closedir (dir.stream); |
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391 | __set_errno (save_err); |
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392 | |
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393 | if (data->actdir-- == 0) |
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394 | data->actdir = data->maxdir - 1; |
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395 | data->dirstreams[data->actdir] = NULL; |
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396 | |
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397 | return result; |
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398 | } |
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399 | } |
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400 | |
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401 | /* Next, update the `struct FTW' information. */ |
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402 | ++data->ftw.level; |
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403 | startp = strchr (data->dirbuf, '\0'); |
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404 | /* There always must be a directory name. */ |
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405 | assert (startp != data->dirbuf); |
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406 | if (startp[-1] != '/') |
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407 | *startp++ = '/'; |
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408 | data->ftw.base = startp - data->dirbuf; |
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409 | |
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410 | while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL) |
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411 | { |
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412 | result = process_entry (data, &dir, d->d_name, strlen (d->d_name)); |
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413 | if (result != 0) |
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414 | break; |
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415 | } |
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416 | |
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417 | if (dir.stream != NULL) |
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418 | { |
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419 | /* The stream is still open. I.e., we did not need more |
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420 | descriptors. Simply close the stream now. */ |
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421 | int save_err = errno; |
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422 | |
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423 | assert (dir.content == NULL); |
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424 | |
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425 | closedir (dir.stream); |
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426 | __set_errno (save_err); |
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427 | |
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428 | if (data->actdir-- == 0) |
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429 | data->actdir = data->maxdir - 1; |
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430 | data->dirstreams[data->actdir] = NULL; |
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431 | } |
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432 | else |
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433 | { |
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434 | int save_err; |
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435 | char *runp = dir.content; |
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436 | |
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437 | while (result == 0 && *runp != '\0') |
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438 | { |
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439 | char *endp = strchr (runp, '\0'); |
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440 | |
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441 | result = process_entry (data, &dir, runp, endp - runp); |
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442 | |
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443 | runp = endp + 1; |
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444 | } |
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445 | |
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446 | save_err = errno; |
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447 | free (dir.content); |
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448 | __set_errno (save_err); |
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449 | } |
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450 | |
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451 | /* Prepare the return, revert the `struct FTW' information. */ |
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452 | data->dirbuf[data->ftw.base - 1] = '\0'; |
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453 | --data->ftw.level; |
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454 | data->ftw.base = previous_base; |
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455 | |
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456 | /* Finally, if we process depth-first report the directory. */ |
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457 | if (result == 0 && (data->flags & FTW_DEPTH)) |
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458 | result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw); |
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459 | |
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460 | return result; |
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461 | } |
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462 | |
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463 | |
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464 | static int |
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465 | ftw_startup (const char *dir, int is_nftw, void *func, int descriptors, |
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466 | int flags) |
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467 | { |
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468 | struct ftw_data data; |
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469 | struct STAT st; |
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470 | int result = 0; |
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471 | int save_err; |
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472 | int len; |
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473 | char *cwd = NULL; |
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474 | char *cp; |
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475 | |
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476 | /* First make sure the parameters are reasonable. */ |
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477 | if (dir[0] == '\0') |
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478 | { |
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479 | __set_errno (ENOENT); |
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480 | return -1; |
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481 | } |
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482 | |
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483 | if (access (dir, R_OK) != 0) |
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484 | return -1; |
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485 | |
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486 | data.maxdir = descriptors < 1 ? 1 : descriptors; |
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487 | data.actdir = 0; |
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488 | data.dirstreams = (struct dir_data **) alloca (data.maxdir |
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489 | * sizeof (struct dir_data *)); |
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490 | memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *)); |
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491 | |
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492 | #ifdef PATH_MAX |
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493 | data.dirbufsize = MAX (2 * strlen (dir), PATH_MAX); |
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494 | #else |
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495 | data.dirbufsize = 2 * strlen (dir); |
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496 | #endif |
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497 | data.dirbuf = (char *) malloc (data.dirbufsize); |
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498 | if (data.dirbuf == NULL) |
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499 | return -1; |
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500 | len = strlen (dir); |
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501 | cp = mempcpy (data.dirbuf, dir, len); |
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502 | /* Strip trailing slashes. */ |
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503 | while (cp > data.dirbuf + 1 && cp[-1] == '/') |
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504 | --cp; |
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505 | *cp = '\0'; |
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506 | |
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507 | data.ftw.level = 0; |
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508 | |
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509 | /* Find basename. */ |
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510 | while (cp > data.dirbuf && cp[-1] != '/') |
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511 | --cp; |
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512 | data.ftw.base = cp - data.dirbuf; |
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513 | |
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514 | data.flags = flags; |
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515 | |
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516 | /* This assignment might seem to be strange but it is what we want. |
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517 | The trick is that the first three arguments to the `ftw' and |
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518 | `nftw' callback functions are equal. Therefore we can call in |
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519 | every case the callback using the format of the `nftw' version |
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520 | and get the correct result since the stack layout for a function |
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521 | call in C allows this. */ |
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522 | data.func = (NFTW_FUNC_T) func; |
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523 | |
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524 | /* Since we internally use the complete set of FTW_* values we need |
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525 | to reduce the value range before calling a `ftw' callback. */ |
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526 | data.cvt_arr = is_nftw ? nftw_arr : ftw_arr; |
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527 | |
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528 | /* No object known so far. */ |
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529 | data.known_objects = NULL; |
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530 | |
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531 | /* Now go to the directory containing the initial file/directory. */ |
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532 | if ((flags & FTW_CHDIR) && data.ftw.base > 0) |
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533 | { |
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534 | /* GNU extension ahead. */ |
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535 | cwd = getcwd (NULL, 0); |
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536 | if (cwd == NULL) |
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537 | result = -1; |
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538 | else |
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539 | { |
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540 | /* Change to the directory the file is in. In data.dirbuf |
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541 | we have a writable copy of the file name. Just NUL |
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542 | terminate it for now and change the directory. */ |
---|
543 | if (data.ftw.base == 1) |
---|
544 | /* I.e., the file is in the root directory. */ |
---|
545 | result = chdir ("/"); |
---|
546 | else |
---|
547 | { |
---|
548 | char ch = data.dirbuf[data.ftw.base - 1]; |
---|
549 | data.dirbuf[data.ftw.base - 1] = '\0'; |
---|
550 | result = chdir (data.dirbuf); |
---|
551 | data.dirbuf[data.ftw.base - 1] = ch; |
---|
552 | } |
---|
553 | } |
---|
554 | } |
---|
555 | |
---|
556 | /* Get stat info for start directory. */ |
---|
557 | if (result == 0) |
---|
558 | { |
---|
559 | if (((flags & FTW_PHYS) |
---|
560 | ? LXSTAT (data.dirbuf, &st) |
---|
561 | : XSTAT (data.dirbuf, &st)) < 0) |
---|
562 | { |
---|
563 | if (errno == EACCES) |
---|
564 | result = (*data.func) (data.dirbuf, &st, FTW_NS, &data.ftw); |
---|
565 | else if (!(flags & FTW_PHYS) |
---|
566 | && errno == ENOENT |
---|
567 | && LXSTAT (dir, &st) == 0 |
---|
568 | && S_ISLNK (st.st_mode)) |
---|
569 | result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN], |
---|
570 | &data.ftw); |
---|
571 | else |
---|
572 | /* No need to call the callback since we cannot say anything |
---|
573 | about the object. */ |
---|
574 | result = -1; |
---|
575 | } |
---|
576 | else |
---|
577 | { |
---|
578 | if (S_ISDIR (st.st_mode)) |
---|
579 | { |
---|
580 | /* Remember the device of the initial directory in case |
---|
581 | FTW_MOUNT is given. */ |
---|
582 | data.dev = st.st_dev; |
---|
583 | |
---|
584 | /* We know this directory now. */ |
---|
585 | if (!(flags & FTW_PHYS)) |
---|
586 | result = add_object (&data, &st); |
---|
587 | |
---|
588 | if (result == 0) |
---|
589 | result = ftw_dir (&data, &st); |
---|
590 | } |
---|
591 | else |
---|
592 | { |
---|
593 | int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F; |
---|
594 | |
---|
595 | result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag], |
---|
596 | &data.ftw); |
---|
597 | } |
---|
598 | } |
---|
599 | } |
---|
600 | |
---|
601 | /* Return to the start directory (if necessary). */ |
---|
602 | if (cwd != NULL) |
---|
603 | { |
---|
604 | int save_err = errno; |
---|
605 | chdir (cwd); |
---|
606 | free (cwd); |
---|
607 | __set_errno (save_err); |
---|
608 | } |
---|
609 | |
---|
610 | /* Free all memory. */ |
---|
611 | save_err = errno; |
---|
612 | tdestroy (data.known_objects, free); |
---|
613 | free (data.dirbuf); |
---|
614 | __set_errno (save_err); |
---|
615 | |
---|
616 | return result; |
---|
617 | } |
---|
618 | |
---|
619 | |
---|
620 | |
---|
621 | /* Entry points. */ |
---|
622 | |
---|
623 | int |
---|
624 | FTW_NAME (path, func, descriptors) |
---|
625 | const char *path; |
---|
626 | FTW_FUNC_T func; |
---|
627 | int descriptors; |
---|
628 | { |
---|
629 | return ftw_startup (path, 0, func, descriptors, 0); |
---|
630 | } |
---|
631 | |
---|
632 | int |
---|
633 | NFTW_NAME (path, func, descriptors, flags) |
---|
634 | const char *path; |
---|
635 | NFTW_FUNC_T func; |
---|
636 | int descriptors; |
---|
637 | int flags; |
---|
638 | { |
---|
639 | return ftw_startup (path, 1, func, descriptors, flags); |
---|
640 | } |
---|