1 /*
2 *
3 * Copyright (C) 2008, The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 #include <dirent.h>
19 #include <fcntl.h>
20 #include <sys/stat.h>
21 #include <unistd.h>
22
23 #include <diskusage/dirsize.h>
24
stat_size(struct stat * s)25 int64_t stat_size(struct stat *s)
26 {
27 int64_t blksize = s->st_blksize;
28 // count actual blocks used instead of nominal file size
29 int64_t size = s->st_blocks * 512;
30
31 if (blksize) {
32 /* round up to filesystem block size */
33 size = (size + blksize - 1) & (~(blksize - 1));
34 }
35
36 return size;
37 }
38
calculate_dir_size(int dfd)39 int64_t calculate_dir_size(int dfd)
40 {
41 int64_t size = 0;
42 struct stat s;
43 DIR *d;
44 struct dirent *de;
45
46 d = fdopendir(dfd);
47 if (d == NULL) {
48 close(dfd);
49 return 0;
50 }
51
52 while ((de = readdir(d))) {
53 const char *name = de->d_name;
54 if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
55 size += stat_size(&s);
56 }
57 if (de->d_type == DT_DIR) {
58 int subfd;
59
60 /* always skip "." and ".." */
61 if (name[0] == '.') {
62 if (name[1] == 0)
63 continue;
64 if ((name[1] == '.') && (name[2] == 0))
65 continue;
66 }
67
68 subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
69 if (subfd >= 0) {
70 size += calculate_dir_size(subfd);
71 }
72 }
73 }
74 closedir(d);
75 return size;
76 }
77