Mercurial > hg > toybox
annotate toys/posix/du.c @ 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.
The actual code should be the same afterward, this is just cosmetic refactoring.
author | Rob Landley <rob@landley.net> |
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date | Tue, 13 Nov 2012 17:14:08 -0600 |
parents | 7e846e281e38 |
children | 3aaba60133c8 |
rev | line source |
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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.
Rob Landley <rob@landley.net>
parents:
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1 /* du.c - disk usage program. |
658 | 2 * |
3 * Copyright 2012 Ashwini Kumar <ak.ashwini@gmail.com> | |
4 * | |
5 * See http://opengroup.org/onlinepubs/9699919799/utilities/du.html | |
6 | |
7 USE_DU(NEWTOY(du, "d#<0hmlcaHkLsx", TOYFLAG_USR|TOYFLAG_BIN)) | |
8 | |
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...] |
658 | 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 |
658 | 27 */ |
28 | |
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New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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29 #define FOR_du |
658 | 30 #include "toys.h" |
31 | |
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New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
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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; |
658 | 39 ) |
40 | |
41 typedef struct node_size { | |
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42 struct dirtree *node; |
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43 long size; |
658 | 44 }node_size; |
45 | |
46 typedef struct inode_ent { | |
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47 ino_t ino; |
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48 dev_t dev; |
658 | 49 }inode_ent_t; |
50 | |
51 /* | |
52 * Adding '/' to the name if name is '.' or '..' | |
53 */ | |
54 | |
55 char *make_pathproper(char *str) | |
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; |
658 | 69 } |
70 | |
71 /* | |
72 * Print the size of the given entry in specified format, default in blocks of 512 bytes | |
73 */ | |
74 void print(long size, char* name) | |
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); |
658 | 86 } |
87 | |
88 /* | |
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89 * free the inodes which are stored for hard link reference |
658 | 90 */ |
91 void free_inodes(void *data) | |
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); |
658 | 96 } |
97 | |
98 /* | |
99 * allocate and add a node to the list | |
100 */ | |
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)); |
658 | 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; |
658 | 108 } |
109 | |
110 /* | |
111 * check if the given stat entry is already there in list or not | |
112 */ | |
113 int is_inode_present(struct stat *st) | |
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; |
658 | 123 } |
124 | |
125 /* | |
126 * Compute the size of the node | |
127 */ | |
128 int do_du(struct dirtree *node) | |
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; |
658 | 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 } |
658 | 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. |
658 | 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)); |
658 | 176 return 0; |
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177 } |
658 | 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; |
658 | 190 } |
191 | |
192 /* | |
193 * DU utility main function | |
194 */ | |
195 void du_main(void) | |
196 { | |
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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. |
658 | 210 } |
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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"); |
658 | 215 } |