Mercurial > hg > toybox
annotate lib/dirtree.c @ 569:2e0367cb9585
More work on ls. Now ls -lR sort of works-ish.
author | Rob Landley <rob@landley.net> |
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date | Sun, 22 Apr 2012 23:01:23 -0500 |
parents | 44abf4d901f3 |
children | 4058eacd4fbc |
rev | line source |
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143
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1 /* vi: set sw=4 ts=4 :*/ |
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2 /* dirtree.c - Functions for dealing with directory trees. |
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3 * |
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4 * Copyright 2007 Rob Landley <rob@landley.net> |
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5 */ |
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6 |
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7 #include "toys.h" |
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8 |
565
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9 // Create a dirtree node from a path, with stat and symlink info. |
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10 // (This doesn't open directory filehandles yet so as not to exhaust the |
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11 // filehandle space on large trees. handle_callback() does that instead.) |
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12 |
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13 struct dirtree *dirtree_add_node(int dirfd, char *name) |
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14 { |
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15 struct dirtree *dt = NULL; |
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16 struct stat st; |
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17 char buf[4096]; |
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18 int len = 0, linklen = 0; |
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Remove trailing whitespace (thanks to Charlie Shepherd), and a couple comment
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19 |
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20 if (name) { |
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21 if (fstatat(dirfd, name, &st, AT_SYMLINK_NOFOLLOW)) goto error; |
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22 if (S_ISLNK(st.st_mode)) { |
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23 if (0>(linklen = readlinkat(dirfd, name, buf, 4095))) goto error; |
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24 buf[linklen++]=0; |
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25 } |
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26 len = strlen(name); |
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27 } |
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28 dt = xzalloc((len = sizeof(struct dirtree)+len+1)+linklen); |
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29 if (name) { |
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30 memcpy(&(dt->st), &st, sizeof(struct stat)); |
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31 strcpy(dt->name, name); |
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32 |
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33 if (linklen) { |
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34 dt->symlink = memcpy(len+(char *)dt, buf, linklen); |
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35 dt->data = --linklen; |
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36 } |
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37 } |
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38 |
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39 return dt; |
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40 |
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41 error: |
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42 perror_msg("%s",name); |
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43 free(dt); |
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44 return 0; |
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45 } |
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46 |
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47 // Return path to this node, assembled recursively. |
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48 |
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49 char *dirtree_path(struct dirtree *node, int *plen) |
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50 { |
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51 char *path; |
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52 int len; |
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53 |
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54 if (!node || !node->name) { |
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55 path = xmalloc(*plen); |
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56 *plen = 0; |
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57 return path; |
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58 } |
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59 |
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60 len = (plen ? *plen : 0)+strlen(node->name)+1; |
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61 path = dirtree_path(node->parent, &len); |
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62 if (len) path[len++]='/'; |
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63 len = (stpcpy(path+len, node->name) - path); |
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64 if (plen) *plen = len; |
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65 |
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66 return path; |
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67 } |
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68 |
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69 // Default callback, filters out "." and "..". |
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70 |
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71 int dirtree_isdotdot(struct dirtree *catch) |
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72 { |
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73 // Should we skip "." and ".."? |
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74 if (catch->name[0]=='.' && (!catch->name[1] || |
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75 (catch->name[1]=='.' && !catch->name[2]))) |
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76 return DIRTREE_NOSAVE|DIRTREE_NORECURSE; |
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77 |
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78 return 0; |
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79 } |
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80 |
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81 // Handle callback for a node in the tree. Returns saved node(s) or NULL. |
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82 // |
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83 // By default, allocates a tree of struct dirtree, not following symlinks |
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84 // If callback==NULL, or callback always returns 0, allocate tree of struct |
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85 // dirtree and return root of tree. Otherwise call callback(node) on each hit, free |
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86 // structures after use, and return NULL. |
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87 // |
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88 |
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89 struct dirtree *handle_callback(struct dirtree *new, |
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90 int (*callback)(struct dirtree *node)) |
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91 { |
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92 int flags; |
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93 |
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94 if (!callback) callback = dirtree_isdotdot; |
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95 |
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96 flags = callback(new); |
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97 if (S_ISDIR(new->st.st_mode)) { |
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98 if (!(flags & DIRTREE_NORECURSE)) { |
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99 new->data = openat (new->parent ? new->parent->data : AT_FDCWD, |
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100 new->name, 0); |
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101 dirtree_recurse(new, callback); |
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102 } |
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103 new->data = -1; |
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104 if (flags & DIRTREE_COMEAGAIN) flags = callback(new); |
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105 } |
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106 // If this had children, it was callback's job to free them already. |
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107 if (flags & DIRTREE_NOSAVE) { |
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108 free(new); |
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109 new = NULL; |
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110 } |
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111 |
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112 return (flags & DIRTREE_ABORT)==DIRTREE_ABORT ? DIRTREE_ABORTVAL : new; |
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113 } |
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114 |
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115 // Recursively read/process children of directory node (with dirfd in data), |
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116 // filtering through callback(). |
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117 |
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118 void dirtree_recurse(struct dirtree *node, |
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119 int (*callback)(struct dirtree *node)) |
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120 { |
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121 struct dirtree *new, **ddt = &(node->child); |
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122 struct dirent *entry; |
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123 DIR *dir; |
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124 |
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125 if (!(dir = fdopendir(node->data))) { |
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126 char *path = dirtree_path(node, 0); |
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127 perror_msg("No %s", path); |
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128 free(path); |
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129 close(node->data); |
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130 |
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131 return; |
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132 } |
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133 |
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134 // according to the fddir() man page, the filehandle in the DIR * can still |
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135 // be externally used by things that don't lseek() it. |
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136 |
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137 // The extra parentheses are to shut the stupid compiler up. |
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138 while ((entry = readdir(dir))) { |
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139 if (!(new = dirtree_add_node(node->data, entry->d_name))) continue; |
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140 new->parent = node; |
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141 new = handle_callback(new, callback); |
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142 if (new == DIRTREE_ABORTVAL) break; |
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143 if (new) { |
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144 *ddt = new; |
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145 ddt = &((*ddt)->next); |
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146 } |
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147 } |
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148 |
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149 closedir(dir); |
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150 } |
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151 |
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152 // Create dirtree from path, using callback to filter nodes. |
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153 // If callback == NULL allocate a tree of struct dirtree nodes and return |
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154 // pointer to root node. |
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155 |
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156 struct dirtree *dirtree_read(char *path, int (*callback)(struct dirtree *node)) |
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157 { |
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158 struct dirtree *root = dirtree_add_node(AT_FDCWD, path); |
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159 |
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160 return handle_callback(root, callback); |
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161 } |