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annotate lib/dirtree.c @ 1423:8059cfd67acd draft

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Building busybox from source needs find -not (a synonym for posix's "!").
author Rob Landley <rob@landley.net>
date Tue, 05 Aug 2014 19:32:44 -0500
parents 5f20ac712f44
children a2796b4cef49
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143
9cbb323f297f Break out dirtree.c and let it call a function instead of returning the data.
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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, dirtree_handle_callback() does that.)
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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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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
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64 perror_msg("%s%s%s", path, parent ? "/" : "", name);
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65 if (parent) free(path);
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66 }
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67 if (parent) parent->symlink = (char *)1;
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68 free(dt);
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69 return 0;
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70 }
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71
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72 // Return path to this node, assembled recursively.
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74 char *dirtree_path(struct dirtree *node, int *plen)
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75 {
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76 char *path;
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77 int len;
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78
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79 if (!node || !node->name) {
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80 path = xmalloc(*plen);
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81 *plen = 0;
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82 return path;
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83 }
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84
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85 len = (plen ? *plen : 0)+strlen(node->name)+1;
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86 path = dirtree_path(node->parent, &len);
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87 if (len && path[len-1] != '/') path[len++]='/';
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88 len = (stpcpy(path+len, node->name) - path);
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89 if (plen) *plen = len;
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90
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91 return path;
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92 }
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93
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94 int dirtree_parentfd(struct dirtree *node)
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95 {
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96 return node->parent ? node->parent->data : AT_FDCWD;
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97 }
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98
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99 // Handle callback for a node in the tree. Returns saved node(s) or NULL.
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100 //
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101 // By default, allocates a tree of struct dirtree, not following symlinks
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102 // If callback==NULL, or callback always returns 0, allocate tree of struct
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103 // dirtree and return root of tree. Otherwise call callback(node) on each
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104 // hit, free structures after use, and return NULL.
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105 //
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106
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107 struct dirtree *dirtree_handle_callback(struct dirtree *new,
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108 int (*callback)(struct dirtree *node))
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109 {
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110 int flags, dir = S_ISDIR(new->st.st_mode);
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111
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112 if (!callback) callback = dirtree_notdotdot;
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113
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114 flags = callback(new);
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115
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116 if (dir) {
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117 if (flags & (DIRTREE_RECURSE|DIRTREE_COMEAGAIN)) {
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118 new->data = openat(dirtree_parentfd(new), new->name, O_CLOEXEC);
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119 flags = dirtree_recurse(new, callback, flags);
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120 }
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121 }
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122
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123 // If this had children, it was callback's job to free them already.
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124 if (!(flags & DIRTREE_SAVE)) {
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125 free(new);
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126 new = NULL;
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127 }
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128
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129 return (flags & DIRTREE_ABORT)==DIRTREE_ABORT ? DIRTREE_ABORTVAL : new;
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130 }
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131
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132 // Recursively read/process children of directory node (with dirfd in data),
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133 // filtering through callback().
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134
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135 int dirtree_recurse(struct dirtree *node,
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136 int (*callback)(struct dirtree *node), int flags)
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137 {
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138 struct dirtree *new, **ddt = &(node->child);
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139 struct dirent *entry;
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140 DIR *dir;
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141
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142 if (node->data == -1 || !(dir = fdopendir(node->data))) {
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143 char *path = dirtree_path(node, 0);
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144 perror_msg("No %s", path);
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145 free(path);
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146 close(node->data);
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147
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148 return flags;
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149 }
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150
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151 // according to the fddir() man page, the filehandle in the DIR * can still
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152 // be externally used by things that don't lseek() it.
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153
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154 // The extra parentheses are to shut the stupid compiler up.
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155 while ((entry = readdir(dir))) {
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156 if (!(new = dirtree_add_node(node, entry->d_name, flags&DIRTREE_SYMFOLLOW)))
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157 continue;
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158 new = dirtree_handle_callback(new, callback);
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159 if (new == DIRTREE_ABORTVAL) break;
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160 if (new) {
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161 *ddt = new;
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162 ddt = &((*ddt)->next);
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163 }
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164 }
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165
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166 if (flags & DIRTREE_COMEAGAIN) {
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167 node->again++;
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168 flags = callback(node);
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169 }
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170
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171 // This closes filehandle as well, so note it
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172 closedir(dir);
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173 node->data = -1;
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174
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175 return flags;
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176 }
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177
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178 // Create dirtree from path, using callback to filter nodes.
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179 // If callback == NULL allocate a tree of struct dirtree nodes and return
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180 // pointer to root node.
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181 // symfollow is just for the top of tree, callback return code controls children
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182
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183 struct dirtree *dirtree_read(char *path, int (*callback)(struct dirtree *node))
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184 {
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185 struct dirtree *root = dirtree_add_node(0, path, 0);
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186
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187 return root ? dirtree_handle_callback(root, callback) : DIRTREE_ABORTVAL;
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188 }