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 24 int64_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 38 int64_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
