Contents of /trunk/mkinitrd-magellan/busybox/coreutils/du.c
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 5796 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Mini du implementation for busybox |
4 | * |
5 | * Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu |
6 | * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org> |
7 | * Copyright (C) 2002 Edward Betts <edward@debian.org> |
8 | * |
9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
10 | */ |
11 | |
12 | /* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */ |
13 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */ |
14 | |
15 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) |
16 | * |
17 | * Mostly rewritten for SUSv3 compliance and to fix bugs/defects. |
18 | * 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options. |
19 | * The -d option allows setting of max depth (similar to gnu --max-depth). |
20 | * 2) Fixed incorrect size calculations for links and directories, especially |
21 | * when errors occurred. Calculates sizes should now match gnu du output. |
22 | * 3) Added error checking of output. |
23 | * 4) Fixed busybox bug #1284 involving long overflow with human_readable. |
24 | */ |
25 | |
26 | #include "libbb.h" |
27 | |
28 | enum { |
29 | OPT_a_files_too = (1 << 0), |
30 | OPT_H_follow_links = (1 << 1), |
31 | OPT_k_kbytes = (1 << 2), |
32 | OPT_L_follow_links = (1 << 3), |
33 | OPT_s_total_norecurse = (1 << 4), |
34 | OPT_x_one_FS = (1 << 5), |
35 | OPT_d_maxdepth = (1 << 6), |
36 | OPT_l_hardlinks = (1 << 7), |
37 | OPT_c_total = (1 << 8), |
38 | OPT_h_for_humans = (1 << 9), |
39 | OPT_m_mbytes = (1 << 10), |
40 | }; |
41 | |
42 | struct globals { |
43 | #if ENABLE_FEATURE_HUMAN_READABLE |
44 | unsigned long disp_hr; |
45 | #else |
46 | unsigned disp_k; |
47 | #endif |
48 | int max_print_depth; |
49 | bool status; |
50 | int slink_depth; |
51 | int du_depth; |
52 | dev_t dir_dev; |
53 | }; |
54 | #define G (*(struct globals*)&bb_common_bufsiz1) |
55 | |
56 | |
57 | static void print(unsigned long size, const char *filename) |
58 | { |
59 | /* TODO - May not want to defer error checking here. */ |
60 | #if ENABLE_FEATURE_HUMAN_READABLE |
61 | printf("%s\t%s\n", |
62 | /* size x 512 / G.disp_hr, show one fractional, |
63 | * use suffixes if G.disp_hr == 0 */ |
64 | make_human_readable_str(size, 512, G.disp_hr), |
65 | filename); |
66 | #else |
67 | if (G.disp_k) { |
68 | size++; |
69 | size >>= 1; |
70 | } |
71 | printf("%lu\t%s\n", size, filename); |
72 | #endif |
73 | } |
74 | |
75 | /* tiny recursive du */ |
76 | static unsigned long du(const char *filename) |
77 | { |
78 | struct stat statbuf; |
79 | unsigned long sum; |
80 | |
81 | if (lstat(filename, &statbuf) != 0) { |
82 | bb_simple_perror_msg(filename); |
83 | G.status = EXIT_FAILURE; |
84 | return 0; |
85 | } |
86 | |
87 | if (option_mask32 & OPT_x_one_FS) { |
88 | if (G.du_depth == 0) { |
89 | G.dir_dev = statbuf.st_dev; |
90 | } else if (G.dir_dev != statbuf.st_dev) { |
91 | return 0; |
92 | } |
93 | } |
94 | |
95 | sum = statbuf.st_blocks; |
96 | |
97 | if (S_ISLNK(statbuf.st_mode)) { |
98 | if (G.slink_depth > G.du_depth) { /* -H or -L */ |
99 | if (stat(filename, &statbuf) != 0) { |
100 | bb_simple_perror_msg(filename); |
101 | G.status = EXIT_FAILURE; |
102 | return 0; |
103 | } |
104 | sum = statbuf.st_blocks; |
105 | if (G.slink_depth == 1) { |
106 | /* Convert -H to -L */ |
107 | G.slink_depth = INT_MAX; |
108 | } |
109 | } |
110 | } |
111 | |
112 | if (!(option_mask32 & OPT_l_hardlinks) |
113 | && statbuf.st_nlink > 1 |
114 | ) { |
115 | /* Add files/directories with links only once */ |
116 | if (is_in_ino_dev_hashtable(&statbuf)) { |
117 | return 0; |
118 | } |
119 | add_to_ino_dev_hashtable(&statbuf, NULL); |
120 | } |
121 | |
122 | if (S_ISDIR(statbuf.st_mode)) { |
123 | DIR *dir; |
124 | struct dirent *entry; |
125 | char *newfile; |
126 | |
127 | dir = warn_opendir(filename); |
128 | if (!dir) { |
129 | G.status = EXIT_FAILURE; |
130 | return sum; |
131 | } |
132 | |
133 | while ((entry = readdir(dir))) { |
134 | newfile = concat_subpath_file(filename, entry->d_name); |
135 | if (newfile == NULL) |
136 | continue; |
137 | ++G.du_depth; |
138 | sum += du(newfile); |
139 | --G.du_depth; |
140 | free(newfile); |
141 | } |
142 | closedir(dir); |
143 | } else { |
144 | if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0) |
145 | return sum; |
146 | } |
147 | if (G.du_depth <= G.max_print_depth) { |
148 | print(sum, filename); |
149 | } |
150 | return sum; |
151 | } |
152 | |
153 | int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
154 | int du_main(int argc UNUSED_PARAM, char **argv) |
155 | { |
156 | unsigned long total; |
157 | int slink_depth_save; |
158 | unsigned opt; |
159 | |
160 | #if ENABLE_FEATURE_HUMAN_READABLE |
161 | IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;) |
162 | IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;) |
163 | if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */ |
164 | G.disp_hr = 512; |
165 | #else |
166 | IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;) |
167 | /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */ |
168 | #endif |
169 | G.max_print_depth = INT_MAX; |
170 | |
171 | /* Note: SUSv3 specifies that -a and -s options cannot be used together |
172 | * in strictly conforming applications. However, it also says that some |
173 | * du implementations may produce output when -a and -s are used together. |
174 | * gnu du exits with an error code in this case. We choose to simply |
175 | * ignore -a. This is consistent with -s being equivalent to -d 0. |
176 | */ |
177 | #if ENABLE_FEATURE_HUMAN_READABLE |
178 | opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+"; |
179 | opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth); |
180 | argv += optind; |
181 | if (opt & OPT_h_for_humans) { |
182 | G.disp_hr = 0; |
183 | } |
184 | if (opt & OPT_m_mbytes) { |
185 | G.disp_hr = 1024*1024; |
186 | } |
187 | if (opt & OPT_k_kbytes) { |
188 | G.disp_hr = 1024; |
189 | } |
190 | #else |
191 | opt_complementary = "H-L:L-H:s-d:d-s:d+"; |
192 | opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth); |
193 | argv += optind; |
194 | #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K |
195 | if (opt & OPT_k_kbytes) { |
196 | G.disp_k = 1; |
197 | } |
198 | #endif |
199 | #endif |
200 | if (opt & OPT_H_follow_links) { |
201 | G.slink_depth = 1; |
202 | } |
203 | if (opt & OPT_L_follow_links) { |
204 | G.slink_depth = INT_MAX; |
205 | } |
206 | if (opt & OPT_s_total_norecurse) { |
207 | G.max_print_depth = 0; |
208 | } |
209 | |
210 | /* go through remaining args (if any) */ |
211 | if (!*argv) { |
212 | *--argv = (char*)"."; |
213 | if (G.slink_depth == 1) { |
214 | G.slink_depth = 0; |
215 | } |
216 | } |
217 | |
218 | slink_depth_save = G.slink_depth; |
219 | total = 0; |
220 | do { |
221 | total += du(*argv); |
222 | /* otherwise du /dir /dir won't show /dir twice: */ |
223 | reset_ino_dev_hashtable(); |
224 | G.slink_depth = slink_depth_save; |
225 | } while (*++argv); |
226 | |
227 | if (opt & OPT_c_total) |
228 | print(total, "total"); |
229 | |
230 | fflush_stdout_and_exit(G.status); |
231 | } |