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annotate toys/posix/du.c @ 694:786841fdb1e0

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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. The actual code should be the same afterward, this is just cosmetic refactoring.
author Rob Landley <rob@landley.net>
date Tue, 13 Nov 2012 17:14:08 -0600
parents 7e846e281e38
children 3aaba60133c8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
694
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1 /* du.c - disk usage program.
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2 *
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3 * Copyright 2012 Ashwini Kumar <ak.ashwini@gmail.com>
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4 *
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5 * See http://opengroup.org/onlinepubs/9699919799/utilities/du.html
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6
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7 USE_DU(NEWTOY(du, "d#<0hmlcaHkLsx", TOYFLAG_USR|TOYFLAG_BIN))
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8
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9 config DU
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10 bool "du"
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11 default y
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12 help
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13 usage: du [-d N] [-askxHLlmc] [file...]
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14
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15 Estimate file space usage (default in unit of 512 blocks).
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16 -a Show all file sizes
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17 -H Follow symlinks on cmdline
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18 -L Follow all symlinks
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19 -k Show size in units of 1024.
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20 -s Show only the total Size for each file specified
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21 -x Estimate size only on the same device
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22 -c Print total size of all arguments
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23 -d N Limit output to directories (and files with -a) of depth < N
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24 -l Count sizes many times if hard linked
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25 -h Sizes in human readable format (e.g., 1K 243M 2G )
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26 -m Sizes in megabytes
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27 */
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28
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29 #define FOR_du
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30 #include "toys.h"
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31
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32 GLOBALS(
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33 long maxdepth;
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34 long depth;
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35 long *dirsum;
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36 long total;
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37 dev_t st_dev;
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38 struct arg_list *inodes;
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39 )
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40
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41 typedef struct node_size {
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42 struct dirtree *node;
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43 long size;
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44 }node_size;
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45
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46 typedef struct inode_ent {
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47 ino_t ino;
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48 dev_t dev;
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49 }inode_ent_t;
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50
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51 /*
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52 * Adding '/' to the name if name is '.' or '..'
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53 */
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54
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55 char *make_pathproper(char *str)
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56 {
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57 char *path = str;
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58 switch(strlen(str)) {
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59 case 1:
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60 if(str[0] == '.') path = xstrdup("./");
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61 break;
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62 case 2:
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63 if(str[0] == '.' && str[1] == '.') path = xstrdup("../");
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64 break;
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65 default:
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66 break;
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67 }
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68 return path;
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69 }
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70
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71 /*
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72 * Print the size of the given entry in specified format, default in blocks of 512 bytes
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73 */
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74 void print(long size, char* name)
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75 {
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76 unsigned long long tempsize = (unsigned long long)size * 512;
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77 unsigned long unit = 512;
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78 char *sizestr = NULL;
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79 if(TT.depth > TT.maxdepth) return;
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80 if(toys.optflags & FLAG_h) unit = 0;
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81 if(toys.optflags & FLAG_k) unit = 1024;
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82 if(toys.optflags & FLAG_m) unit = 1024*1024;
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83 sizestr = make_human_readable(tempsize, unit); //make human readable string, depending upon unit size.
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84 xprintf("%s\t%s\n",sizestr, name);
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85 free(sizestr);
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86 }
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87
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88 /*
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89 * free the inodes which are stored for hard link reference
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90 */
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91 void free_inodes(void *data)
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92 {
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93 void *arg = ((struct arg_list*)data)->arg;
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94 if(arg) free(arg);
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95 free(data);
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96 }
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97
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98 /*
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99 * allocate and add a node to the list
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100 */
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101 static void llist_add_inode(struct arg_list **old, void *data)
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102 {
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103 struct arg_list *new = xmalloc(sizeof(struct arg_list));
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104
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105 new->arg = (char*)data;
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106 new->next = *old;
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107 *old = new;
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108 }
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109
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110 /*
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111 * check if the given stat entry is already there in list or not
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112 */
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113 int is_inode_present(struct stat *st)
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114 {
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115 struct arg_list *temparg = NULL;
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116 inode_ent_t *ent = NULL;
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117 if(!TT.inodes) return 0;
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118 for(temparg = TT.inodes; temparg; temparg = (struct arg_list *)temparg->next) {
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119 ent = (inode_ent_t*)temparg->arg;
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120 if(ent && ent->ino == st->st_ino && ent->dev == st->st_dev) return 1;
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121 }
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122 return 0;
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123 }
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124
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125 /*
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126 * Compute the size of the node
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127 */
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128 int do_du(struct dirtree *node)
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129 {
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130 inode_ent_t *ino_details = NULL;
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131 node_size *nd = NULL;
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132 if(!dirtree_notdotdot(node)) return 0;
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133 if((toys.optflags & FLAG_x) && (TT.st_dev != node->st.st_dev)) //if file not on same device, don't count size
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134 return DIRTREE_RECURSE;
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135
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136 if(!(toys.optflags & FLAG_l) && node->st.st_nlink > 1 && !node->extra) { //keeping reference for hard links
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137 if(is_inode_present(&node->st)) return DIRTREE_RECURSE;
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138 ino_details = xzalloc(sizeof(inode_ent_t));
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139 ino_details->ino = node->st.st_ino;
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140 ino_details->dev = node->st.st_dev;
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141 llist_add_inode(&TT.inodes, (void*)ino_details);
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142 }
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143
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144 if(S_ISDIR(node->st.st_mode)) {
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145 if(!(node->extra && (long)((node_size*)(node->extra))->node == (long)node)) {
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146 nd = xzalloc(sizeof(node_size));
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147 nd->node = node;
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148 nd->size = 0;
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149 TT.dirsum = (long*)&(nd->size);
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150 node->extra = (long)nd;
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151 *TT.dirsum = 0;
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152 TT.depth++;
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153 return (DIRTREE_RECURSE|DIRTREE_COMEAGAIN | ((toys.optflags & FLAG_L) ? DIRTREE_SYMFOLLOW : 0)); //DIRTREE_COMEAGAIN to comeback and print the entry.
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154 }
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155 else if(node->extra) { //extra is set for a returning DIR entry.
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156 long offset = 0;
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157 nd = (node_size*)node->extra;
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158 offset = nd->size;
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159 nd->size += node->st.st_blocks;
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160 TT.depth--;
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161 if(!(toys.optflags & FLAG_s))
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162 print(*TT.dirsum, dirtree_path(node, NULL));
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163 if((node->parent) && (node->parent->extra)) {
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164 /* when returning from internal directory, get the saved size of the parent and continue from there */
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165 nd = (node_size*)node->parent->extra;
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166 TT.dirsum = (long*)&(nd->size);
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167 *TT.dirsum += offset;
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168 *TT.dirsum += node->st.st_blocks;
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169 return DIRTREE_RECURSE;
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170 }
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171 else if(!node->parent) {
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172 /*if node has no parent, it means it is the top in the tree, stop recursing here */
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173 TT.total += *TT.dirsum;
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174 if((toys.optflags & FLAG_s))
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175 print(*TT.dirsum, dirtree_path(node, NULL));
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176 return 0;
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177 }
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178 }
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179 }
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180 else if(!(node->parent)) {
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181 /* this is the file specified on cmdline */
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182 TT.total += node->st.st_blocks;
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183 print(node->st.st_blocks, dirtree_path(node, NULL));
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184 return 0;
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185 }
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186 if(TT.dirsum) *TT.dirsum += node->st.st_blocks;
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187 if(toys.optflags & FLAG_a && !(toys.optflags & FLAG_s))
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188 print(node->st.st_blocks, dirtree_path(node, NULL));
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189 return DIRTREE_RECURSE;
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190 }
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191
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192 /*
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193 * DU utility main function
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194 */
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195 void du_main(void)
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196 {
694
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197 int symfollow = toys.optflags & (FLAG_H | FLAG_L);
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198 TT.total = 0;
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199 TT.inodes = NULL;
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200
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201 if(!(toys.optflags & FLAG_d)) TT.maxdepth = INT_MAX;
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202 if(toys.optc == 0) toys.optargs[0] = "./";
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203 while(*toys.optargs) {
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204 TT.depth = 0;
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205 char *path = make_pathproper(*toys.optargs);
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206 struct dirtree *root = dirtree_add_node(AT_FDCWD, path, symfollow); //create a node
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207 if(root) {
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208 TT.st_dev = root->st.st_dev;
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209 handle_callback(root, do_du); //this will recurse thru the DIR children.
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210 }
694
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211 toys.optargs++;
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212 }
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213 if(TT.inodes) llist_traverse(TT.inodes, free_inodes); //free the stored nodes
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214 if(toys.optflags & FLAG_c) print(TT.total, "total");
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215 }