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
22#include <diskusage/dirsize.h>
23
24int64_t stat_size(struct stat *s)
25{
26    int64_t blksize = s->st_blksize;
27    // count actual blocks used instead of nominal file size
28    int64_t size = s->st_blocks * 512;
29
30    if (blksize) {
31        /* round up to filesystem block size */
32        size = (size + blksize - 1) & (~(blksize - 1));
33    }
34
35    return size;
36}
37
38int64_t calculate_dir_size(int dfd)
39{
40    int64_t size = 0;
41    struct stat s;
42    DIR *d;
43    struct dirent *de;
44
45    d = fdopendir(dfd);
46    if (d == NULL) {
47        close(dfd);
48        return 0;
49    }
50
51    while ((de = readdir(d))) {
52        const char *name = de->d_name;
53        if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
54            size += stat_size(&s);
55        }
56        if (de->d_type == DT_DIR) {
57            int subfd;
58
59            /* always skip "." and ".." */
60            if (name[0] == '.') {
61                if (name[1] == 0)
62                    continue;
63                if ((name[1] == '.') && (name[2] == 0))
64                    continue;
65            }
66
67            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
68            if (subfd >= 0) {
69                size += calculate_dir_size(subfd);
70            }
71        }
72    }
73    closedir(d);
74    return size;
75}
76