Mercurial > hg > toybox
annotate lib/dirtree.c @ 735:3aaba60133c8
Have dirtree_add_node() set parent so error message can provide full path.
author | Rob Landley <rob@landley.net> |
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date | Thu, 06 Dec 2012 15:13:30 -0600 |
parents | 786841fdb1e0 |
children | 451d7e91232e |
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1 /* dirtree.c - Functions for dealing with directory trees. |
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2 * |
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3 * Copyright 2007 Rob Landley <rob@landley.net> |
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4 */ |
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5 |
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6 #include "toys.h" |
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7 |
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8 static int notdotdot(char *name) |
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9 { |
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10 if (name[0]=='.' && (!name[1] || (name[1]=='.' && !name[2]))) return 0; |
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11 |
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12 return 1; |
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13 } |
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14 |
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15 // Default callback, filters out "." and "..". |
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16 |
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17 int dirtree_notdotdot(struct dirtree *catch) |
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18 { |
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19 // Should we skip "." and ".."? |
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20 return notdotdot(catch->name) ? DIRTREE_SAVE|DIRTREE_RECURSE : 0; |
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21 } |
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22 |
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23 // Create a dirtree node from a path, with stat and symlink info. |
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24 // (This doesn't open directory filehandles yet so as not to exhaust the |
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25 // filehandle space on large trees. handle_callback() does that instead.) |
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26 |
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27 struct dirtree *dirtree_add_node(struct dirtree *parent, char *name, |
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28 int symfollow) |
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29 { |
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30 struct dirtree *dt = NULL; |
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31 struct stat st; |
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32 char buf[4096]; |
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33 int len = 0, linklen = 0; |
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34 |
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35 if (name) { |
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36 // open code this because haven't got node to call dirtree_parentfd() on yet |
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37 int fd = parent ? parent->data : AT_FDCWD; |
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38 |
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39 if (fstatat(fd, name, &st, symfollow ? 0 : AT_SYMLINK_NOFOLLOW)) goto error; |
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40 if (S_ISLNK(st.st_mode)) { |
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41 if (0>(linklen = readlinkat(fd, name, buf, 4095))) goto error; |
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42 buf[linklen++]=0; |
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43 } |
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44 len = strlen(name); |
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45 } |
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46 dt = xzalloc((len = sizeof(struct dirtree)+len+1)+linklen); |
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47 dt->parent = parent; |
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48 if (name) { |
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49 memcpy(&(dt->st), &st, sizeof(struct stat)); |
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50 strcpy(dt->name, name); |
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51 |
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52 if (linklen) { |
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53 dt->symlink = memcpy(len+(char *)dt, buf, linklen); |
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54 dt->data = --linklen; |
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55 } |
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56 } |
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57 |
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58 return dt; |
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59 |
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60 error: |
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61 if (notdotdot(name)) { |
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62 char *path = parent ? dirtree_path(parent, 0) : ""; |
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63 perror_msg("%s%s%s",path, parent ? "/" : "", name); |
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64 } |
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65 free(dt); |
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66 return 0; |
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67 } |
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68 |
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69 // Return path to this node, assembled recursively. |
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70 |
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71 char *dirtree_path(struct dirtree *node, int *plen) |
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72 { |
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73 char *path; |
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74 int len; |
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75 |
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76 if (!node || !node->name) { |
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77 path = xmalloc(*plen); |
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78 *plen = 0; |
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79 return path; |
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80 } |
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81 |
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82 len = (plen ? *plen : 0)+strlen(node->name)+1; |
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83 path = dirtree_path(node->parent, &len); |
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84 if (len && path[len-1] != '/') path[len++]='/'; |
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85 len = (stpcpy(path+len, node->name) - path); |
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86 if (plen) *plen = len; |
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87 |
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88 return path; |
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89 } |
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90 |
601 | 91 int dirtree_parentfd(struct dirtree *node) |
92 { | |
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93 return node->parent ? node->parent->data : AT_FDCWD; |
601 | 94 } |
95 | |
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96 // Handle callback for a node in the tree. Returns saved node(s) or NULL. |
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97 // |
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98 // By default, allocates a tree of struct dirtree, not following symlinks |
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99 // If callback==NULL, or callback always returns 0, allocate tree of struct |
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100 // dirtree and return root of tree. Otherwise call callback(node) on each |
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101 // hit, free structures after use, and return NULL. |
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102 // |
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103 |
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104 struct dirtree *handle_callback(struct dirtree *new, |
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105 int (*callback)(struct dirtree *node)) |
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106 { |
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107 int flags, dir = S_ISDIR(new->st.st_mode); |
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108 |
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109 if (!callback) callback = dirtree_notdotdot; |
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110 |
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111 flags = callback(new); |
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112 |
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113 if (dir) { |
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114 if (flags & (DIRTREE_RECURSE|DIRTREE_COMEAGAIN)) { |
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115 new->data = openat(dirtree_parentfd(new), new->name, 0); |
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116 dirtree_recurse(new, callback, flags & DIRTREE_SYMFOLLOW); |
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117 if (flags & DIRTREE_COMEAGAIN) flags = callback(new); |
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118 } |
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119 } |
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120 |
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121 // If this had children, it was callback's job to free them already. |
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122 if (!(flags & DIRTREE_SAVE)) { |
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123 free(new); |
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124 new = NULL; |
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125 } |
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126 |
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127 return (flags & DIRTREE_ABORT)==DIRTREE_ABORT ? DIRTREE_ABORTVAL : new; |
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128 } |
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129 |
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130 // Recursively read/process children of directory node (with dirfd in data), |
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131 // filtering through callback(). |
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132 |
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133 void dirtree_recurse(struct dirtree *node, |
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134 int (*callback)(struct dirtree *node), int symfollow) |
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135 { |
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136 struct dirtree *new, **ddt = &(node->child); |
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137 struct dirent *entry; |
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138 DIR *dir; |
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139 |
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140 if (!(dir = fdopendir(node->data))) { |
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141 char *path = dirtree_path(node, 0); |
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142 perror_msg("No %s", path); |
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143 free(path); |
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144 close(node->data); |
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145 |
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146 return; |
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147 } |
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148 |
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149 // according to the fddir() man page, the filehandle in the DIR * can still |
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150 // be externally used by things that don't lseek() it. |
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151 |
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152 // The extra parentheses are to shut the stupid compiler up. |
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153 while ((entry = readdir(dir))) { |
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154 if (!(new = dirtree_add_node(node, entry->d_name, symfollow))) |
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155 continue; |
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156 new = handle_callback(new, callback); |
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157 if (new == DIRTREE_ABORTVAL) break; |
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158 if (new) { |
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159 *ddt = new; |
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160 ddt = &((*ddt)->next); |
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161 } |
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162 } |
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163 |
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164 // This closes filehandle as well, so note it |
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165 closedir(dir); |
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166 node->data = -1; |
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167 } |
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168 |
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169 // Create dirtree from path, using callback to filter nodes. |
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170 // If callback == NULL allocate a tree of struct dirtree nodes and return |
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171 // pointer to root node. |
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172 // symfollow is just for the top of tree, callback return code controls children |
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173 |
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174 struct dirtree *dirtree_read(char *path, int (*callback)(struct dirtree *node)) |
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175 { |
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176 struct dirtree *root = dirtree_add_node(0, path, 0); |
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Rewrite dirtree so we don't need readdir, scandir, and fts.h. Rewrite ls (from scratch) to use new dirtree infrastructure. (This breaks everything else that currently uses dirtree.)
Rob Landley <rob@landley.net>
parents:
320
diff
changeset
|
177 |
694
786841fdb1e0
Reindent to two spaces per level. Remove vi: directives that haven't worked right in years (ubuntu broke its' vim implementation). Remove trailing spaces. Add/remove blank lines. Re-wordwrap in places. Update documentation with new coding style.
Rob Landley <rob@landley.net>
parents:
629
diff
changeset
|
178 return root ? handle_callback(root, callback) : DIRTREE_ABORTVAL; |
565
44abf4d901f3
Rewrite dirtree so we don't need readdir, scandir, and fts.h. Rewrite ls (from scratch) to use new dirtree infrastructure. (This breaks everything else that currently uses dirtree.)
Rob Landley <rob@landley.net>
parents:
320
diff
changeset
|
179 } |