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