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270 lines
6.4 KiB
C
270 lines
6.4 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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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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 <stdlib.h>
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#include <limits.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <sys/stat.h>
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#include "busybox.h"
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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# ifdef CONFIG_FEATURE_DU_DEFALT_BLOCKSIZE_1K
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static unsigned long disp_hr = KILOBYTE;
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# else
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static unsigned long disp_hr = 512;
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# endif
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#elif defined CONFIG_FEATURE_DU_DEFALT_BLOCKSIZE_1K
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static unsigned int disp_k = 1;
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#else
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static unsigned int disp_k; /* bss inits to 0 */
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#endif
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static int max_print_depth = INT_MAX;
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static nlink_t count_hardlinks = 1;
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static int status
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#if EXIT_SUCCESS == 0
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= EXIT_SUCCESS
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#endif
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;
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static int print_files;
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static int slink_depth;
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static int du_depth;
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static int one_file_system;
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static dev_t dir_dev;
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static void print(long size, char *filename)
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{
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/* TODO - May not want to defer error checking here. */
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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bb_printf("%s\t%s\n", make_human_readable_str(size, 512, disp_hr),
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filename);
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#else
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if (disp_k) {
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size++;
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size >>= 1;
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}
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bb_printf("%ld\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 long du(char *filename)
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{
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struct stat statbuf;
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long sum;
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if ((lstat(filename, &statbuf)) != 0) {
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bb_perror_msg("%s", filename);
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status = EXIT_FAILURE;
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return 0;
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}
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if (one_file_system) {
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if (du_depth == 0) {
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dir_dev = statbuf.st_dev;
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} else if (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 (slink_depth > du_depth) { /* -H or -L */
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if ((stat(filename, &statbuf)) != 0) {
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bb_perror_msg("%s", filename);
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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 (slink_depth == 1) {
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slink_depth = INT_MAX; /* Convert -H to -L. */
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}
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}
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}
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if (statbuf.st_nlink > count_hardlinks) {
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/* Add files/directories with links only once */
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if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
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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 = opendir(filename);
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if (!dir) {
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bb_perror_msg("%s", filename);
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status = EXIT_FAILURE;
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return sum;
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}
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newfile = last_char_is(filename, '/');
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if (newfile)
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*newfile = '\0';
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while ((entry = readdir(dir))) {
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char *name = entry->d_name;
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newfile = concat_subpath_file(filename, name);
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if(newfile == NULL)
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continue;
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++du_depth;
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sum += du(newfile);
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--du_depth;
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free(newfile);
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}
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closedir(dir);
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} else if (du_depth > print_files) {
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return sum;
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}
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if (du_depth <= 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)
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{
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long total;
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int slink_depth_save;
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int print_final_total;
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char *smax_print_depth;
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unsigned long opt;
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#ifdef CONFIG_FEATURE_DU_DEFALT_BLOCKSIZE_1K
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if (getenv("POSIXLY_CORRECT")) { /* TODO - a new libbb function? */
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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disp_hr = 512;
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#else
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disp_k = 0;
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#endif
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}
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#endif
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/* Note: SUSv3 specifies that -a and -s options can not 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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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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bb_opt_complementally = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s";
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opt = bb_getopt_ulflags(argc, argv, "aHkLsx" "d:" "lc" "hm", &smax_print_depth);
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if((opt & (1 << 9))) {
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/* -h opt */
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disp_hr = 0;
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}
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if((opt & (1 << 10))) {
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/* -m opt */
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disp_hr = MEGABYTE;
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}
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if((opt & (1 << 2))) {
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/* -k opt */
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disp_hr = KILOBYTE;
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}
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#else
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bb_opt_complementally = "H-L:L-H:s-d:d-s";
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opt = bb_getopt_ulflags(argc, argv, "aHkLsx" "d:" "lc", &smax_print_depth);
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#if !defined CONFIG_FEATURE_DU_DEFALT_BLOCKSIZE_1K
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if((opt & (1 << 2))) {
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/* -k opt */
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disp_k = 1;
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}
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#endif
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#endif
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if((opt & (1 << 0))) {
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/* -a opt */
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print_files = INT_MAX;
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}
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if((opt & (1 << 1))) {
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/* -H opt */
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slink_depth = 1;
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}
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if((opt & (1 << 3))) {
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/* -L opt */
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slink_depth = INT_MAX;
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}
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if((opt & (1 << 4))) {
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/* -s opt */
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max_print_depth = 0;
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}
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one_file_system = opt & (1 << 5); /* -x opt */
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if((opt & (1 << 6))) {
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/* -d opt */
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max_print_depth = bb_xgetularg10_bnd(smax_print_depth, 0, INT_MAX);
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}
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if((opt & (1 << 7))) {
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/* -l opt */
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count_hardlinks = INT_MAX;
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}
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print_final_total = opt & (1 << 8); /* -c opt */
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/* go through remaining args (if any) */
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argv += optind;
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if (optind >= argc) {
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*--argv = ".";
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if (slink_depth == 1) {
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slink_depth = 0;
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}
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}
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slink_depth_save = slink_depth;
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total = 0;
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do {
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total += du(*argv);
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slink_depth = slink_depth_save;
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} while (*++argv);
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#ifdef CONFIG_FEATURE_CLEAN_UP
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reset_ino_dev_hashtable();
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#endif
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if (print_final_total) {
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print(total, "total");
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}
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bb_fflush_stdout_and_exit(status);
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}
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