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This change retains "or later" state! No licensing _changes_ here, only form is adjusted (article, space between "GPL" and "v2" and so on). Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
232 lines
5.7 KiB
C
232 lines
5.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini du implementation for busybox
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*
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* Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu
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* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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* Copyright (C) 2002 Edward Betts <edward@debian.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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/* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
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* 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
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* The -d option allows setting of max depth (similar to gnu --max-depth).
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* 2) Fixed incorrect size calculations for links and directories, especially
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* when errors occurred. Calculates sizes should now match gnu du output.
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* 3) Added error checking of output.
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* 4) Fixed busybox bug #1284 involving long overflow with human_readable.
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*/
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#include "libbb.h"
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enum {
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OPT_a_files_too = (1 << 0),
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OPT_H_follow_links = (1 << 1),
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OPT_k_kbytes = (1 << 2),
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OPT_L_follow_links = (1 << 3),
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OPT_s_total_norecurse = (1 << 4),
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OPT_x_one_FS = (1 << 5),
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OPT_d_maxdepth = (1 << 6),
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OPT_l_hardlinks = (1 << 7),
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OPT_c_total = (1 << 8),
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OPT_h_for_humans = (1 << 9),
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OPT_m_mbytes = (1 << 10),
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};
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struct globals {
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#if ENABLE_FEATURE_HUMAN_READABLE
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unsigned long disp_hr;
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#else
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unsigned disp_k;
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#endif
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int max_print_depth;
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bool status;
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int slink_depth;
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int du_depth;
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dev_t dir_dev;
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} FIX_ALIASING;
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#define G (*(struct globals*)&bb_common_bufsiz1)
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static void print(unsigned long size, const char *filename)
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{
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/* TODO - May not want to defer error checking here. */
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#if ENABLE_FEATURE_HUMAN_READABLE
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printf("%s\t%s\n",
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/* size x 512 / G.disp_hr, show one fractional,
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* use suffixes if G.disp_hr == 0 */
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make_human_readable_str(size, 512, G.disp_hr),
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filename);
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#else
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if (G.disp_k) {
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size++;
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size >>= 1;
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}
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printf("%lu\t%s\n", size, filename);
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#endif
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}
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/* tiny recursive du */
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static unsigned long du(const char *filename)
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{
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struct stat statbuf;
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unsigned long sum;
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if (lstat(filename, &statbuf) != 0) {
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bb_simple_perror_msg(filename);
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G.status = EXIT_FAILURE;
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return 0;
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}
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if (option_mask32 & OPT_x_one_FS) {
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if (G.du_depth == 0) {
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G.dir_dev = statbuf.st_dev;
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} else if (G.dir_dev != statbuf.st_dev) {
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return 0;
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}
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}
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sum = statbuf.st_blocks;
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if (S_ISLNK(statbuf.st_mode)) {
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if (G.slink_depth > G.du_depth) { /* -H or -L */
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if (stat(filename, &statbuf) != 0) {
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bb_simple_perror_msg(filename);
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G.status = EXIT_FAILURE;
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return 0;
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}
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sum = statbuf.st_blocks;
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if (G.slink_depth == 1) {
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/* Convert -H to -L */
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G.slink_depth = INT_MAX;
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}
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}
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}
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if (!(option_mask32 & OPT_l_hardlinks)
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&& statbuf.st_nlink > 1
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) {
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/* Add files/directories with links only once */
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if (is_in_ino_dev_hashtable(&statbuf)) {
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return 0;
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}
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add_to_ino_dev_hashtable(&statbuf, NULL);
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}
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if (S_ISDIR(statbuf.st_mode)) {
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DIR *dir;
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struct dirent *entry;
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char *newfile;
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dir = warn_opendir(filename);
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if (!dir) {
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G.status = EXIT_FAILURE;
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return sum;
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}
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while ((entry = readdir(dir))) {
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newfile = concat_subpath_file(filename, entry->d_name);
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if (newfile == NULL)
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continue;
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++G.du_depth;
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sum += du(newfile);
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--G.du_depth;
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free(newfile);
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}
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closedir(dir);
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} else {
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if (!(option_mask32 & OPT_a_files_too) && G.du_depth != 0)
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return sum;
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}
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if (G.du_depth <= G.max_print_depth) {
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print(sum, filename);
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}
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return sum;
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}
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int du_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int du_main(int argc UNUSED_PARAM, char **argv)
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{
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unsigned long total;
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int slink_depth_save;
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unsigned opt;
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#if ENABLE_FEATURE_HUMAN_READABLE
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IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 1024;)
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IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_hr = 512;)
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if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
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G.disp_hr = 512;
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#else
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IF_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 1;)
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/* IF_NOT_FEATURE_DU_DEFAULT_BLOCKSIZE_1K(G.disp_k = 0;) - G is pre-zeroed */
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#endif
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G.max_print_depth = INT_MAX;
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/* Note: SUSv3 specifies that -a and -s options cannot be used together
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* in strictly conforming applications. However, it also says that some
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* du implementations may produce output when -a and -s are used together.
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* gnu du exits with an error code in this case. We choose to simply
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* ignore -a. This is consistent with -s being equivalent to -d 0.
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*/
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#if ENABLE_FEATURE_HUMAN_READABLE
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opt_complementary = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s:d+";
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opt = getopt32(argv, "aHkLsx" "d:" "lc" "hm", &G.max_print_depth);
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argv += optind;
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if (opt & OPT_h_for_humans) {
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G.disp_hr = 0;
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}
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if (opt & OPT_m_mbytes) {
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G.disp_hr = 1024*1024;
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}
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if (opt & OPT_k_kbytes) {
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G.disp_hr = 1024;
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}
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#else
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opt_complementary = "H-L:L-H:s-d:d-s:d+";
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opt = getopt32(argv, "aHkLsx" "d:" "lc", &G.max_print_depth);
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argv += optind;
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#if !ENABLE_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
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if (opt & OPT_k_kbytes) {
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G.disp_k = 1;
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}
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#endif
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#endif
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if (opt & OPT_H_follow_links) {
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G.slink_depth = 1;
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}
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if (opt & OPT_L_follow_links) {
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G.slink_depth = INT_MAX;
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}
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if (opt & OPT_s_total_norecurse) {
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G.max_print_depth = 0;
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}
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/* go through remaining args (if any) */
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if (!*argv) {
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*--argv = (char*)".";
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if (G.slink_depth == 1) {
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G.slink_depth = 0;
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}
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}
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slink_depth_save = G.slink_depth;
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total = 0;
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do {
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total += du(*argv);
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/* otherwise du /dir /dir won't show /dir twice: */
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reset_ino_dev_hashtable();
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G.slink_depth = slink_depth_save;
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} while (*++argv);
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if (opt & OPT_c_total)
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print(total, "total");
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fflush_stdout_and_exit(G.status);
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}
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