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
25int64_t stat_size(struct stat *s)
26{
27    return s->st_blocks * 512;
28}
29
30int64_t calculate_dir_size(int dfd)
31{
32    int64_t size = 0;
33    struct stat s;
34    DIR *d;
35    struct dirent *de;
36
37    d = fdopendir(dfd);
38    if (d == NULL) {
39        close(dfd);
40        return 0;
41    }
42
43    while ((de = readdir(d))) {
44        const char *name = de->d_name;
45        if (de->d_type == DT_DIR) {
46            int subfd;
47
48            /* always skip "." and ".." */
49            if (name[0] == '.') {
50                if (name[1] == 0)
51                    continue;
52                if ((name[1] == '.') && (name[2] == 0))
53                    continue;
54            }
55
56            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
57                size += stat_size(&s);
58            }
59            subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
60            if (subfd >= 0) {
61                size += calculate_dir_size(subfd);
62            }
63        } else {
64            if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
65                size += stat_size(&s);
66            }
67        }
68    }
69    closedir(d);
70    return size;
71}
72