coreutils/du.c

   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  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  *
  23  */
  24
  25 #include <sys/types.h>
  26 #include <fcntl.h>
  27 #include <dirent.h>
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <getopt.h>
  31 #include <string.h>
  32 #include <errno.h>
  33 #include "busybox.h"
  34
  35
  36 #ifdef CONFIG_FEATURE_HUMAN_READABLE
  37 static unsigned long disp_hr = KILOBYTE;
  38 #endif
  39
  40 static int du_depth /*= 0*/;
  41 static int count_hardlinks /*= 0*/;
  42 static int one_file_system /*= 0*/;
  43 static dev_t dir_dev;
  44
  45 static void (*print) (long, char *);
  46
  47 static void print_normal(long size, char *filename)
  48 {
  49 #ifdef CONFIG_FEATURE_HUMAN_READABLE
  50         printf("%s\t%s\n", make_human_readable_str(size << 10, 1, disp_hr),
  51                    filename);
  52 #else
  53         printf("%ld\t%s\n", size, filename);
  54 #endif
  55 }
  56
  57 static void print_summary(long size, char *filename)
  58 {
  59         if (du_depth == 1) {
  60                 print_normal(size, filename);
  61         }
  62 }
  63
  64 /* tiny recursive du */
  65 static long du(char *filename)
  66 {
  67         struct stat statbuf;
  68         long sum;
  69
  70         if ((lstat(filename, &statbuf)) != 0) {
  71                 perror_msg("%s", filename);
  72                 return 0;
  73         }
  74         if (du_depth == 0)
  75                 dir_dev = statbuf.st_dev;
  76         else if (one_file_system && dir_dev != statbuf.st_dev)
  77                 return 0;
  78
  79         du_depth++;
  80         sum = (statbuf.st_blocks >> 1);
  81
  82         /* Don't add in stuff pointed to by symbolic links */
  83         if (S_ISLNK(statbuf.st_mode)) {
  84                 sum = 0L;
  85                 if (du_depth == 1) {
  86                 }
  87         }
  88         if (S_ISDIR(statbuf.st_mode)) {
  89                 DIR *dir;
  90                 struct dirent *entry;
  91                 char *newfile;
  92
  93                 dir = opendir(filename);
  94                 if (!dir) {
  95                         du_depth--;
  96                         return 0;
  97                 }
  98
  99                 newfile = last_char_is(filename, '/');
 100                 if (newfile)
 101                         *newfile = '\0';
 102
 103                 while ((entry = readdir(dir))) {
 104                         char *name = entry->d_name;
 105
 106                         if ((strcmp(name, "..") == 0)
 107                                 || (strcmp(name, ".") == 0)) {
 108                                 continue;
 109                         }
 110                         newfile = concat_path_file(filename, name);
 111                         sum += du(newfile);
 112                         free(newfile);
 113                 }
 114                 closedir(dir);
 115                 print(sum, filename);
 116         } else if (statbuf.st_nlink > 1 && !count_hardlinks) {
 117                 /* Add files with hard links only once */
 118                 if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
 119                         sum = 0L;
 120                         if (du_depth == 1)
 121                                 print(sum, filename);
 122                 } else {
 123                         add_to_ino_dev_hashtable(&statbuf, NULL);
 124                 }
 125         }
 126         du_depth--;
 127         return sum;
 128 }
 129
 130 int du_main(int argc, char **argv)
 131 {
 132         int status = EXIT_SUCCESS;
 133         int i;
 134         int c;
 135
 136         /* default behaviour */
 137         print = print_normal;
 138
 139         /* parse argv[] */
 140         while ((c = getopt(argc, argv, "slx"
 141 #ifdef CONFIG_FEATURE_HUMAN_READABLE
 142                                            "hm"
 143 #endif
 144                                            "k")) != EOF) {
 145                 switch (c) {
 146                 case 's':
 147                         print = print_summary;
 148                         break;
 149                 case 'l':
 150                         count_hardlinks = 1;
 151                         break;
 152                 case 'x':
 153                         one_file_system = 1;
 154                         break;
 155 #ifdef CONFIG_FEATURE_HUMAN_READABLE
 156                 case 'h':
 157                         disp_hr = 0;
 158                         break;
 159                 case 'm':
 160                         disp_hr = MEGABYTE;
 161                         break;
 162 #endif
 163                 case 'k':
 164                         break;
 165                 default:
 166                         show_usage();
 167                 }
 168         }
 169
 170         /* go through remaining args (if any) */
 171         if (optind >= argc) {
 172                 if (du(".") == 0)
 173                         status = EXIT_FAILURE;
 174         } else {
 175                 long sum;
 176
 177                 for (i = optind; i < argc; i++) {
 178                         sum = du(argv[i]);
 179                         if (is_directory(argv[i], FALSE, NULL) == FALSE) {
 180                                 print_normal(sum, argv[i]);
 181                         }
 182                         reset_ino_dev_hashtable();
 183                 }
 184         }
 185
 186         return status;
 187 }
 188
 189 /* $Id: du.c,v 1.55 2002/08/23 07:28:45 aaronl Exp $ */
 190 /*
 191 Local Variables:
 192 c-file-style: "linux"
 193 c-basic-offset: 4
 194 tab-width: 4
 195 End:
 196 */