coreutils/du.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini du implementation for busybox
   4  *
   5  *
   6  * Copyright (C) 1999,2000,2001 by Lineo, inc.
   7  * Written by John Beppu <beppu@lineo.com>
   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 BB_FEATURE_HUMAN_READABLE
  37 static unsigned long disp_hr = KILOBYTE;
  38 #endif
  39
  40 typedef void (Display) (long, char *);
  41
  42 static int du_depth = 0;
  43 static int count_hardlinks = 0;
  44
  45 static Display *print;
  46
  47 static void print_normal(long size, char *filename)
  48 {
  49         unsigned long base;
  50 #ifdef BB_FEATURE_HUMAN_READABLE
  51         switch (disp_hr) {
  52                 case MEGABYTE:
  53                         base = KILOBYTE;
  54                         break;
  55                 case KILOBYTE:
  56                         base = 1;
  57                         break;
  58                 default:
  59                         base = 0;
  60         }
  61         printf("%s\t%s\n", make_human_readable_str(size, base), filename);
  62 #else
  63         printf("%ld\t%s\n", size, filename);
  64 #endif
  65 }
  66
  67 static void print_summary(long size, char *filename)
  68 {
  69         if (du_depth == 1) {
  70                 print_normal(size, filename);
  71         }
  72 }
  73
  74 /* tiny recursive du */
  75 static long du(char *filename)
  76 {
  77         struct stat statbuf;
  78         long sum;
  79
  80         if ((lstat(filename, &statbuf)) != 0) {
  81                 perror_msg("%s", filename);
  82                 return 0;
  83         }
  84
  85         du_depth++;
  86         sum = (statbuf.st_blocks >> 1);
  87
  88         /* Don't add in stuff pointed to by symbolic links */
  89         if (S_ISLNK(statbuf.st_mode)) {
  90                 sum = 0L;
  91                 if (du_depth == 1)
  92                         print(sum, filename);
  93         }
  94         if (S_ISDIR(statbuf.st_mode)) {
  95                 DIR *dir;
  96                 struct dirent *entry;
  97                 char *newfile;
  98
  99                 dir = opendir(filename);
 100                 if (!dir) {
 101                         du_depth--;
 102                         return 0;
 103                 }
 104
 105                 newfile = last_char_is(filename, '/');
 106                 if (newfile)
 107                         *newfile = '\0';
 108
 109                 while ((entry = readdir(dir))) {
 110                         char *name = entry->d_name;
 111
 112                         if ((strcmp(name, "..") == 0)
 113                                 || (strcmp(name, ".") == 0)) {
 114                                 continue;
 115                         }
 116                         newfile = concat_path_file(filename, name);
 117                         sum += du(newfile);
 118                         free(newfile);
 119                 }
 120                 closedir(dir);
 121                 print(sum, filename);
 122         }
 123         else if (statbuf.st_nlink > 1 && !count_hardlinks) {
 124                 /* Add files with hard links only once */
 125                 if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
 126                         sum = 0L;
 127                         if (du_depth == 1)
 128                                 print(sum, filename);
 129                 }
 130                 else {
 131                         add_to_ino_dev_hashtable(&statbuf, NULL);
 132                 }
 133         }
 134         du_depth--;
 135         return sum;
 136 }
 137
 138 int du_main(int argc, char **argv)
 139 {
 140         int status = EXIT_SUCCESS;
 141         int i;
 142         int c;
 143
 144         /* default behaviour */
 145         print = print_normal;
 146
 147         /* parse argv[] */
 148         while ((c = getopt(argc, argv, "sl"
 149 #ifdef BB_FEATURE_HUMAN_READABLE
 150 "hm"
 151 #endif
 152 "k")) != EOF) {
 153                         switch (c) {
 154                         case 's':
 155                                         print = print_summary;
 156                                         break;
 157                         case 'l':
 158                                         count_hardlinks = 1;
 159                                         break;
 160 #ifdef BB_FEATURE_HUMAN_READABLE
 161                         case 'h': disp_hr = 0;        break;
 162                         case 'm': disp_hr = MEGABYTE; break;
 163 #endif
 164                         case 'k': 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                         if ((sum = du(argv[i])) == 0)
 179                                 status = EXIT_FAILURE;
 180                         if(is_directory(argv[i], FALSE, NULL)==FALSE) {
 181                                 print_normal(sum, argv[i]);
 182                         }
 183                         reset_ino_dev_hashtable();
 184                 }
 185         }
 186
 187         return status;
 188 }
 189
 190 /* $Id: du.c,v 1.47 2001/05/07 22:49:43 andersen Exp $ */
 191 /*
 192 Local Variables:
 193 c-file-style: "linux"
 194 c-basic-offset: 4
 195 tab-width: 4
 196 End:
 197 */