1/* vi: set sw=4 ts=4: */ 2/* 3 * Mini du implementation for busybox 4 * 5 * Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu 6 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org> 7 * Copyright (C) 2002 Edward Betts <edward@debian.org> 8 * 9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. 10 */ 11 12/* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */ 13/* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */ 14 15/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) 16 * 17 * Mostly rewritten for SUSv3 compliance and to fix bugs/defects. 18 * 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options. 19 * The -d option allows setting of max depth (similar to gnu --max-depth). 20 * 2) Fixed incorrect size calculations for links and directories, especially 21 * when errors occurred. Calculates sizes should now match gnu du output. 22 * 3) Added error checking of output. 23 * 4) Fixed busybox bug #1284 involving long overflow with human_readable. 24 */ 25 26#include "libbb.h" 27 28enum { 29 OPT_a_files_too = (1 << 0), 30 OPT_H_follow_links = (1 << 1), 31 OPT_k_kbytes = (1 << 2), 32 OPT_L_follow_links = (1 << 3), 33 OPT_s_total_norecurse = (1 << 4), 34 OPT_x_one_FS = (1 << 5), 35 OPT_d_maxdepth = (1 << 6), 36 OPT_l_hardlinks = (1 << 7), 37 OPT_c_total = (1 << 8), 38 OPT_h_for_humans = (1 << 9), 39 OPT_m_mbytes = (1 << 10), 40}; 41 42struct globals { 43#if ENABLE_FEATURE_HUMAN_READABLE 44 unsigned long disp_hr; 45#else 46 unsigned disp_k; 47#endif 48 int max_print_depth; 49 bool status; 50 int slink_depth; 51 int du_depth; 52 dev_t dir_dev; 53} FIX_ALIASING; 54#define G (*(struct globals*)&bb_common_bufsiz1) 55 56 57static void print(unsigned long size, const char *filename) 58{ 59 /* TODO - May not want to defer error checking here. */ 60#if ENABLE_FEATURE_HUMAN_READABLE 61 printf("%s\t%s\n", 62 /* size x 512 / G.disp_hr, show one fractional, 63 * use suffixes if G.disp_hr == 0 */ 64 make_human_readable_str(size, 512, G.disp_hr), 65 filename); 66#else 67 if (G.disp_k) { 68 size++; 69 size >>= 1; 70 } 71 printf("%lu\t%s\n", size, filename); 72#endif 73} 74 75/* tiny recursive du */ 76static unsigned long du(const char *filename) 77{ 78 struct stat statbuf; 79 unsigned long sum; 80 81 if (lstat(filename, &statbuf) != 0) { 82 bb_simple_perror_msg(filename); 83 G.status = EXIT_FAILURE; 84 return 0; 85 } 86 87 if (option_mask32 & OPT_x_one_FS) { 88 if (G.du_depth == 0) { 89 G.dir_dev = statbuf.st_dev; 90 } else if (G.dir_dev != statbuf.st_dev) { 91 return 0; 92 } 93 } 94 95 sum = statbuf.st_blocks; 96 97 if (S_ISLNK(statbuf.st_mode)) { 98 if (G.slink_depth > G.du_depth) { /* -H or -L */ 99 if (stat(filename, &statbuf) != 0) { 100 bb_simple_perror_msg(filename); 101 G.status = EXIT_FAILURE; 102 return 0; 103 } 104 sum = statbuf.st_blocks; 105 if (G.slink_depth == 1) { 106 /* Convert -H to -L */ 107 G.slink_depth = INT_MAX; 108 } 109 } 110 } 111 112 if (!(option_mask32 & OPT_l_hardlinks) 113 && statbuf.st_nlink > 1 114 ) { 115 /* Add files/directories with links only once */ 116 if (is_in_ino_dev_hashtable(&statbuf)) { 117 return 0; 118 } 119 add_to_ino_dev_hashtable(&statbuf, NULL); 120 } 121 122 if (S_ISDIR(statbuf.st_mode)) { 123 DIR *dir; 124 struct dirent *entry; 125 char *newfile; 126 127 dir = warn_opendir(filename); 128 if (!dir) { 129 G.status = EXIT_FAILURE; 130 return sum; 131 } 132 133 while ((entry = readdir(dir))) { 134 newfile = concat_subpath_file(filename, entry->d_name); 135 if (newfile == NULL) 136 continue; 137 ++G.du_depth; 138 sum += du(newfile); 139 --G.du_depth; 140 free(newfile); 141 } 142 closedir(dir); 143 } else { 144 if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0) 145 return sum; 146 } 147 if (G.du_depth <= G.max_print_depth) { 148 print(sum, filename); 149 } 150 return sum; 151} 152 153int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; 154int du_main(int argc UNUSED_PARAM, char **argv) 155{ 156 unsigned long total; 157 int slink_depth_save; 158 unsigned opt; 159 160#if ENABLE_FEATURE_HUMAN_READABLE 161 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;) 162 IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;) 163 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */ 164 G.disp_hr = 512; 165#else 166 IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;) 167 /* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */ 168#endif 169 G.max_print_depth = INT_MAX; 170 171 /* Note: SUSv3 specifies that -a and -s options cannot be used together 172 * in strictly conforming applications. However, it also says that some 173 * du implementations may produce output when -a and -s are used together. 174 * gnu du exits with an error code in this case. We choose to simply 175 * ignore -a. This is consistent with -s being equivalent to -d 0. 176 */ 177#if ENABLE_FEATURE_HUMAN_READABLE 178 opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+"; 179 opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth); 180 argv += optind; 181 if (opt & OPT_h_for_humans) { 182 G.disp_hr = 0; 183 } 184 if (opt & OPT_m_mbytes) { 185 G.disp_hr = 1024*1024; 186 } 187 if (opt & OPT_k_kbytes) { 188 G.disp_hr = 1024; 189 } 190#else 191 opt_complementary = "H-L:L-H:s-d:d-s:d+"; 192 opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth); 193 argv += optind; 194#if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K 195 if (opt & OPT_k_kbytes) { 196 G.disp_k = 1; 197 } 198#endif 199#endif 200 if (opt & OPT_H_follow_links) { 201 G.slink_depth = 1; 202 } 203 if (opt & OPT_L_follow_links) { 204 G.slink_depth = INT_MAX; 205 } 206 if (opt & OPT_s_total_norecurse) { 207 G.max_print_depth = 0; 208 } 209 210 /* go through remaining args (if any) */ 211 if (!*argv) { 212 *--argv = (char*)"."; 213 if (G.slink_depth == 1) { 214 G.slink_depth = 0; 215 } 216 } 217 218 slink_depth_save = G.slink_depth; 219 total = 0; 220 do { 221 total += du(*argv); 222 /* otherwise du /dir /dir won't show /dir twice: */ 223 reset_ino_dev_hashtable(); 224 G.slink_depth = slink_depth_save; 225 } while (*++argv); 226 227 if (opt & OPT_c_total) 228 print(total, "total"); 229 230 fflush_stdout_and_exit(G.status); 231} 232