[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Mini du implementation for busybox
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| 4 | *
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| 5 | * Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu
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| 6 | * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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| 7 | * Copyright (C) 2002 Edward Betts <edward@debian.org>
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| 8 | *
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| 9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 10 | */
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| 11 |
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| 12 | /* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
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| 13 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
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| 14 |
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| 15 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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| 16 | *
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| 17 | * Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
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| 18 | * 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
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| 19 | * The -d option allows setting of max depth (similar to gnu --max-depth).
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| 20 | * 2) Fixed incorrect size calculations for links and directories, especially
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| 21 | * when errors occurred. Calculates sizes should now match gnu du output.
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| 22 | * 3) Added error checking of output.
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| 23 | * 4) Fixed busybox bug #1284 involving long overflow with human_readable.
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| 24 | */
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| 25 |
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[1770] | 26 | #include "libbb.h"
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[821] | 27 |
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[1770] | 28 | #if ENABLE_FEATURE_HUMAN_READABLE
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| 29 | # if ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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| 30 | static unsigned long disp_hr = 1024;
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[821] | 31 | # else
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| 32 | static unsigned long disp_hr = 512;
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| 33 | # endif
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[1770] | 34 | #elif ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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| 35 | static unsigned disp_k = 1;
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[821] | 36 | #else
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[1770] | 37 | static unsigned disp_k; /* bss inits to 0 */
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[821] | 38 | #endif
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| 39 |
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| 40 | static int max_print_depth = INT_MAX;
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| 41 | static nlink_t count_hardlinks = 1;
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| 42 |
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[1770] | 43 | static int status;
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[821] | 44 | static int print_files;
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| 45 | static int slink_depth;
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| 46 | static int du_depth;
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| 47 | static int one_file_system;
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| 48 | static dev_t dir_dev;
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| 49 |
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| 50 |
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[1770] | 51 | static void print(long size, const char *const filename)
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[821] | 52 | {
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| 53 | /* TODO - May not want to defer error checking here. */
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[1770] | 54 | #if ENABLE_FEATURE_HUMAN_READABLE
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| 55 | printf("%s\t%s\n", make_human_readable_str(size, 512, disp_hr),
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| 56 | filename);
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[821] | 57 | #else
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| 58 | if (disp_k) {
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| 59 | size++;
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| 60 | size >>= 1;
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| 61 | }
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[1770] | 62 | printf("%ld\t%s\n", size, filename);
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[821] | 63 | #endif
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| 64 | }
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| 65 |
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| 66 | /* tiny recursive du */
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[1770] | 67 | static long du(const char *const filename)
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[821] | 68 | {
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| 69 | struct stat statbuf;
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| 70 | long sum;
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| 71 |
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[1770] | 72 | if (lstat(filename, &statbuf) != 0) {
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[821] | 73 | bb_perror_msg("%s", filename);
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| 74 | status = EXIT_FAILURE;
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| 75 | return 0;
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| 76 | }
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| 77 |
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| 78 | if (one_file_system) {
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| 79 | if (du_depth == 0) {
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| 80 | dir_dev = statbuf.st_dev;
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| 81 | } else if (dir_dev != statbuf.st_dev) {
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| 82 | return 0;
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| 83 | }
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| 84 | }
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| 85 |
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| 86 | sum = statbuf.st_blocks;
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| 87 |
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| 88 | if (S_ISLNK(statbuf.st_mode)) {
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| 89 | if (slink_depth > du_depth) { /* -H or -L */
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[1770] | 90 | if (stat(filename, &statbuf) != 0) {
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[821] | 91 | bb_perror_msg("%s", filename);
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| 92 | status = EXIT_FAILURE;
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| 93 | return 0;
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| 94 | }
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| 95 | sum = statbuf.st_blocks;
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| 96 | if (slink_depth == 1) {
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| 97 | slink_depth = INT_MAX; /* Convert -H to -L. */
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| 98 | }
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| 99 | }
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| 100 | }
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| 101 |
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| 102 | if (statbuf.st_nlink > count_hardlinks) {
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| 103 | /* Add files/directories with links only once */
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[1770] | 104 | if (is_in_ino_dev_hashtable(&statbuf)) {
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[821] | 105 | return 0;
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| 106 | }
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| 107 | add_to_ino_dev_hashtable(&statbuf, NULL);
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| 108 | }
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| 109 |
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| 110 | if (S_ISDIR(statbuf.st_mode)) {
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| 111 | DIR *dir;
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| 112 | struct dirent *entry;
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| 113 | char *newfile;
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| 114 |
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[1770] | 115 | dir = warn_opendir(filename);
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[821] | 116 | if (!dir) {
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| 117 | status = EXIT_FAILURE;
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| 118 | return sum;
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| 119 | }
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| 120 |
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| 121 | newfile = last_char_is(filename, '/');
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| 122 | if (newfile)
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| 123 | *newfile = '\0';
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| 124 |
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| 125 | while ((entry = readdir(dir))) {
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| 126 | char *name = entry->d_name;
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| 127 |
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| 128 | newfile = concat_subpath_file(filename, name);
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[1770] | 129 | if (newfile == NULL)
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[821] | 130 | continue;
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| 131 | ++du_depth;
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| 132 | sum += du(newfile);
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| 133 | --du_depth;
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| 134 | free(newfile);
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| 135 | }
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| 136 | closedir(dir);
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| 137 | } else if (du_depth > print_files) {
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| 138 | return sum;
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| 139 | }
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| 140 | if (du_depth <= max_print_depth) {
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| 141 | print(sum, filename);
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| 142 | }
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| 143 | return sum;
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| 144 | }
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| 145 |
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[1770] | 146 | int du_main(int argc, char **argv);
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[821] | 147 | int du_main(int argc, char **argv)
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| 148 | {
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| 149 | long total;
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| 150 | int slink_depth_save;
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| 151 | int print_final_total;
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| 152 | char *smax_print_depth;
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[1770] | 153 | unsigned opt;
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[821] | 154 |
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[1770] | 155 | #if ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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[821] | 156 | if (getenv("POSIXLY_CORRECT")) { /* TODO - a new libbb function? */
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[1770] | 157 | #if ENABLE_FEATURE_HUMAN_READABLE
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[821] | 158 | disp_hr = 512;
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| 159 | #else
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| 160 | disp_k = 0;
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| 161 | #endif
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| 162 | }
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| 163 | #endif
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| 164 |
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[1770] | 165 | /* Note: SUSv3 specifies that -a and -s options cannot be used together
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[821] | 166 | * in strictly conforming applications. However, it also says that some
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| 167 | * du implementations may produce output when -a and -s are used together.
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| 168 | * gnu du exits with an error code in this case. We choose to simply
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| 169 | * ignore -a. This is consistent with -s being equivalent to -d 0.
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| 170 | */
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[1770] | 171 | #if ENABLE_FEATURE_HUMAN_READABLE
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| 172 | opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s";
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| 173 | opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &smax_print_depth);
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| 174 | if (opt & (1 << 9)) {
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[821] | 175 | /* -h opt */
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| 176 | disp_hr = 0;
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| 177 | }
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[1770] | 178 | if (opt & (1 << 10)) {
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[821] | 179 | /* -m opt */
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[1770] | 180 | disp_hr = 1024*1024;
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[821] | 181 | }
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[1770] | 182 | if (opt & (1 << 2)) {
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[821] | 183 | /* -k opt */
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[1770] | 184 | disp_hr = 1024;
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[821] | 185 | }
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| 186 | #else
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[1770] | 187 | opt_complementary = "H-L:L-H:s-d:d-s";
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| 188 | opt = getopt32(argv, "aHkLsx" "d:" "lc", &smax_print_depth);
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| 189 | #if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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| 190 | if (opt & (1 << 2)) {
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[821] | 191 | /* -k opt */
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[1770] | 192 | disp_k = 1;
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[821] | 193 | }
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| 194 | #endif
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| 195 | #endif
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[1770] | 196 | if (opt & (1 << 0)) {
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[821] | 197 | /* -a opt */
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| 198 | print_files = INT_MAX;
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| 199 | }
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[1770] | 200 | if (opt & (1 << 1)) {
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[821] | 201 | /* -H opt */
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| 202 | slink_depth = 1;
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| 203 | }
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[1770] | 204 | if (opt & (1 << 3)) {
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[821] | 205 | /* -L opt */
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[1770] | 206 | slink_depth = INT_MAX;
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[821] | 207 | }
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[1770] | 208 | if (opt & (1 << 4)) {
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[821] | 209 | /* -s opt */
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[1770] | 210 | max_print_depth = 0;
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| 211 | }
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[821] | 212 | one_file_system = opt & (1 << 5); /* -x opt */
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[1770] | 213 | if (opt & (1 << 6)) {
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[821] | 214 | /* -d opt */
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[1770] | 215 | max_print_depth = xatoi_u(smax_print_depth);
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[821] | 216 | }
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[1770] | 217 | if (opt & (1 << 7)) {
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[821] | 218 | /* -l opt */
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[1770] | 219 | count_hardlinks = MAXINT(nlink_t);
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[821] | 220 | }
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| 221 | print_final_total = opt & (1 << 8); /* -c opt */
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| 222 |
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| 223 | /* go through remaining args (if any) */
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| 224 | argv += optind;
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| 225 | if (optind >= argc) {
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[1770] | 226 | *--argv = (char*)".";
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[821] | 227 | if (slink_depth == 1) {
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| 228 | slink_depth = 0;
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| 229 | }
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| 230 | }
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| 231 |
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| 232 | slink_depth_save = slink_depth;
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| 233 | total = 0;
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| 234 | do {
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| 235 | total += du(*argv);
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| 236 | slink_depth = slink_depth_save;
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| 237 | } while (*++argv);
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[1770] | 238 | if (ENABLE_FEATURE_CLEAN_UP)
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| 239 | reset_ino_dev_hashtable();
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[821] | 240 | if (print_final_total) {
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| 241 | print(total, "total");
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| 242 | }
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| 243 |
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[1770] | 244 | fflush_stdout_and_exit(status);
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[821] | 245 | }
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