[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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| 26 | #include <stdlib.h>
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| 27 | #include <limits.h>
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| 28 | #include <unistd.h>
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| 29 | #include <dirent.h>
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| 30 | #include <sys/stat.h>
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| 31 | #include "busybox.h"
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| 32 |
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| 33 | #ifdef CONFIG_FEATURE_HUMAN_READABLE
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| 34 | # ifdef CONFIG_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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| 35 | static unsigned long disp_hr = KILOBYTE;
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| 36 | # else
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| 37 | static unsigned long disp_hr = 512;
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| 38 | # endif
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| 39 | #elif defined CONFIG_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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| 40 | static unsigned int disp_k = 1;
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| 41 | #else
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| 42 | static unsigned int disp_k; /* bss inits to 0 */
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| 43 | #endif
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| 44 |
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| 45 | static int max_print_depth = INT_MAX;
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| 46 | static nlink_t count_hardlinks = 1;
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| 47 |
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| 48 | static int status
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| 49 | #if EXIT_SUCCESS == 0
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| 50 | = EXIT_SUCCESS
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| 51 | #endif
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| 52 | ;
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| 53 | static int print_files;
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| 54 | static int slink_depth;
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| 55 | static int du_depth;
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| 56 | static int one_file_system;
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| 57 | static dev_t dir_dev;
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| 58 |
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| 59 |
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| 60 | static void print(long size, char *filename)
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| 61 | {
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| 62 | /* TODO - May not want to defer error checking here. */
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| 63 | #ifdef CONFIG_FEATURE_HUMAN_READABLE
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| 64 | bb_printf("%s\t%s\n", make_human_readable_str(size, 512, disp_hr),
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| 65 | filename);
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| 66 | #else
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| 67 | if (disp_k) {
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| 68 | size++;
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| 69 | size >>= 1;
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| 70 | }
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| 71 | bb_printf("%ld\t%s\n", size, filename);
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| 72 | #endif
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| 73 | }
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| 74 |
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| 75 | /* tiny recursive du */
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| 76 | static long du(char *filename)
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| 77 | {
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| 78 | struct stat statbuf;
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| 79 | long sum;
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| 80 |
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| 81 | if ((lstat(filename, &statbuf)) != 0) {
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| 82 | bb_perror_msg("%s", filename);
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| 83 | status = EXIT_FAILURE;
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| 84 | return 0;
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| 85 | }
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| 86 |
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| 87 | if (one_file_system) {
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| 88 | if (du_depth == 0) {
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| 89 | dir_dev = statbuf.st_dev;
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| 90 | } else if (dir_dev != statbuf.st_dev) {
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| 91 | return 0;
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| 92 | }
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| 93 | }
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| 94 |
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| 95 | sum = statbuf.st_blocks;
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| 96 |
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| 97 | if (S_ISLNK(statbuf.st_mode)) {
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| 98 | if (slink_depth > du_depth) { /* -H or -L */
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| 99 | if ((stat(filename, &statbuf)) != 0) {
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| 100 | bb_perror_msg("%s", filename);
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| 101 | status = EXIT_FAILURE;
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| 102 | return 0;
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| 103 | }
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| 104 | sum = statbuf.st_blocks;
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| 105 | if (slink_depth == 1) {
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| 106 | slink_depth = INT_MAX; /* Convert -H to -L. */
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| 107 | }
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| 108 | }
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| 109 | }
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| 110 |
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| 111 | if (statbuf.st_nlink > count_hardlinks) {
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| 112 | /* Add files/directories with links only once */
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| 113 | if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
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| 114 | return 0;
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| 115 | }
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| 116 | add_to_ino_dev_hashtable(&statbuf, NULL);
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| 117 | }
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| 118 |
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| 119 | if (S_ISDIR(statbuf.st_mode)) {
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| 120 | DIR *dir;
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| 121 | struct dirent *entry;
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| 122 | char *newfile;
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| 123 |
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| 124 | dir = bb_opendir(filename);
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| 125 | if (!dir) {
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| 126 | status = EXIT_FAILURE;
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| 127 | return sum;
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| 128 | }
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| 129 |
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| 130 | newfile = last_char_is(filename, '/');
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| 131 | if (newfile)
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| 132 | *newfile = '\0';
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| 133 |
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| 134 | while ((entry = readdir(dir))) {
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| 135 | char *name = entry->d_name;
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| 136 |
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| 137 | newfile = concat_subpath_file(filename, name);
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| 138 | if(newfile == NULL)
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| 139 | continue;
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| 140 | ++du_depth;
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| 141 | sum += du(newfile);
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| 142 | --du_depth;
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| 143 | free(newfile);
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| 144 | }
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| 145 | closedir(dir);
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| 146 | } else if (du_depth > print_files) {
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| 147 | return sum;
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| 148 | }
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| 149 | if (du_depth <= max_print_depth) {
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| 150 | print(sum, filename);
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| 151 | }
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| 152 | return sum;
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| 153 | }
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| 154 |
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| 155 | int du_main(int argc, char **argv)
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| 156 | {
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| 157 | long total;
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| 158 | int slink_depth_save;
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| 159 | int print_final_total;
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| 160 | char *smax_print_depth;
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| 161 | unsigned long opt;
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| 162 |
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| 163 | #ifdef CONFIG_FEATURE_DU_DEFUALT_BLOCKSIZE_1K
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| 164 | if (getenv("POSIXLY_CORRECT")) { /* TODO - a new libbb function? */
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| 165 | #ifdef CONFIG_FEATURE_HUMAN_READABLE
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| 166 | disp_hr = 512;
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| 167 | #else
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| 168 | disp_k = 0;
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| 169 | #endif
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| 170 | }
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| 171 | #endif
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| 172 |
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| 173 | /* Note: SUSv3 specifies that -a and -s options can not be used together
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| 174 | * in strictly conforming applications. However, it also says that some
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| 175 | * du implementations may produce output when -a and -s are used together.
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| 176 | * gnu du exits with an error code in this case. We choose to simply
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| 177 | * ignore -a. This is consistent with -s being equivalent to -d 0.
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| 178 | */
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| 179 | #ifdef CONFIG_FEATURE_HUMAN_READABLE
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| 180 | bb_opt_complementally = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s";
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| 181 | opt = bb_getopt_ulflags(argc, argv, "aHkLsx" "d:" "lc" "hm", &smax_print_depth);
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| 182 | if((opt & (1 << 9))) {
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| 183 | /* -h opt */
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| 184 | disp_hr = 0;
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| 185 | }
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| 186 | if((opt & (1 << 10))) {
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| 187 | /* -m opt */
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| 188 | disp_hr = MEGABYTE;
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| 189 | }
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| 190 | if((opt & (1 << 2))) {
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| 191 | /* -k opt */
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| 192 | disp_hr = KILOBYTE;
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| 193 | }
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| 194 | #else
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| 195 | bb_opt_complementally = "H-L:L-H:s-d:d-s";
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| 196 | opt = bb_getopt_ulflags(argc, argv, "aHkLsx" "d:" "lc", &smax_print_depth);
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| 197 | #if !defined CONFIG_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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| 198 | if((opt & (1 << 2))) {
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| 199 | /* -k opt */
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| 200 | disp_k = 1;
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| 201 | }
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| 202 | #endif
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| 203 | #endif
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| 204 | if((opt & (1 << 0))) {
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| 205 | /* -a opt */
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| 206 | print_files = INT_MAX;
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| 207 | }
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| 208 | if((opt & (1 << 1))) {
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| 209 | /* -H opt */
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| 210 | slink_depth = 1;
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| 211 | }
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| 212 | if((opt & (1 << 3))) {
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| 213 | /* -L opt */
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| 214 | slink_depth = INT_MAX;
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| 215 | }
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| 216 | if((opt & (1 << 4))) {
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| 217 | /* -s opt */
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| 218 | max_print_depth = 0;
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| 219 | }
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| 220 | one_file_system = opt & (1 << 5); /* -x opt */
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| 221 | if((opt & (1 << 6))) {
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| 222 | /* -d opt */
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| 223 | max_print_depth = bb_xgetularg10_bnd(smax_print_depth, 0, INT_MAX);
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| 224 | }
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| 225 | if((opt & (1 << 7))) {
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| 226 | /* -l opt */
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| 227 | count_hardlinks = INT_MAX;
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| 228 | }
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| 229 | print_final_total = opt & (1 << 8); /* -c opt */
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| 230 |
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| 231 | /* go through remaining args (if any) */
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| 232 | argv += optind;
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| 233 | if (optind >= argc) {
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| 234 | *--argv = ".";
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| 235 | if (slink_depth == 1) {
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| 236 | slink_depth = 0;
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| 237 | }
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| 238 | }
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| 239 |
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| 240 | slink_depth_save = slink_depth;
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| 241 | total = 0;
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| 242 | do {
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| 243 | total += du(*argv);
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| 244 | slink_depth = slink_depth_save;
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| 245 | } while (*++argv);
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| 246 | #ifdef CONFIG_FEATURE_CLEAN_UP
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| 247 | reset_ino_dev_hashtable();
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| 248 | #endif
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| 249 |
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| 250 | if (print_final_total) {
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| 251 | print(total, "total");
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| 252 | }
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| 253 |
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| 254 | bb_fflush_stdout_and_exit(status);
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| 255 | }
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