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/*
*
* Copyright (C) 2008, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <dirent.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <diskusage/dirsize.h>
int64_t stat_size(struct stat *s)
{
int64_t blksize = s->st_blksize;
// count actual blocks used instead of nominal file size
int64_t size = s->st_blocks * 512;
if (blksize) {
/* round up to filesystem block size */
size = (size + blksize - 1) & (~(blksize - 1));
}
return size;
}
int64_t calculate_dir_size(int dfd)
{
int64_t size = 0;
struct stat s;
DIR *d;
struct dirent *de;
d = fdopendir(dfd);
if (d == NULL) {
close(dfd);
return 0;
}
while ((de = readdir(d))) {
const char *name = de->d_name;
if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) {
size += stat_size(&s);
}
if (de->d_type == DT_DIR) {
int subfd;
/* always skip "." and ".." */
if (name[0] == '.') {
if (name[1] == 0)
continue;
if ((name[1] == '.') && (name[2] == 0))
continue;
}
subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY);
if (subfd >= 0) {
size += calculate_dir_size(subfd);
}
}
}
closedir(d);
return size;
}
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