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 25 int64_t stat_size(struct stat *s) 26 { 27 int64_t blksize = s->st_blksize; 28 // count actual blocks used instead of nominal file size 29 int64_t size = s->st_blocks * 512; 30 31 if (blksize) { 32 /* round up to filesystem block size */ 33 size = (size + blksize - 1) & (~(blksize - 1)); 34 } 35 36 return size; 37 } 38 39 int64_t calculate_dir_size(int dfd) 40 { 41 int64_t size = 0; 42 struct stat s; 43 DIR *d; 44 struct dirent *de; 45 46 d = fdopendir(dfd); 47 if (d == NULL) { 48 close(dfd); 49 return 0; 50 } 51 52 while ((de = readdir(d))) { 53 const char *name = de->d_name; 54 if (fstatat(dfd, name, &s, AT_SYMLINK_NOFOLLOW) == 0) { 55 size += stat_size(&s); 56 } 57 if (de->d_type == DT_DIR) { 58 int subfd; 59 60 /* always skip "." and ".." */ 61 if (name[0] == '.') { 62 if (name[1] == 0) 63 continue; 64 if ((name[1] == '.') && (name[2] == 0)) 65 continue; 66 } 67 68 subfd = openat(dfd, name, O_RDONLY | O_DIRECTORY); 69 if (subfd >= 0) { 70 size += calculate_dir_size(subfd); 71 } 72 } 73 } 74 closedir(d); 75 return size; 76 } 77
