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 #define BB_DECLARE_EXTERN
  35 #define bb_need_name_too_long
  36 #include "messages.c"
  37
  38
  39 #ifdef BB_FEATURE_HUMAN_READABLE
  40 static unsigned long disp_hr = KILOBYTE;
  41 #endif
  42
  43 typedef void (Display) (long, char *);
  44
  45 static int du_depth = 0;
  46 static int count_hardlinks = 0;
  47
  48 static Display *print;
  49
  50 static void print_normal(long size, char *filename)
  51 {
  52         unsigned long base;
  53 #ifdef BB_FEATURE_HUMAN_READABLE
  54         switch (disp_hr) {
  55                 case MEGABYTE:
  56                         base = KILOBYTE;
  57                         break;
  58                 case KILOBYTE:
  59                         base = 1;
  60                         break;
  61                 default:
  62                         base = 0;
  63         }
  64         printf("%s\t%s\n", make_human_readable_str(size, base), filename);
  65 #else
  66         printf("%ld\t%s\n", size, filename);
  67 #endif
  68 }
  69
  70 static void print_summary(long size, char *filename)
  71 {
  72         if (du_depth == 1) {
  73                 printf("summary\n");
  74                 print_normal(size, filename);
  75         }
  76 }
  77
  78 /* tiny recursive du */
  79 static long du(char *filename)
  80 {
  81         struct stat statbuf;
  82         long sum;
  83         int len;
  84
  85         if ((lstat(filename, &statbuf)) != 0) {
  86                 perror_msg("%s", filename);
  87                 return 0;
  88         }
  89
  90         du_depth++;
  91         sum = (statbuf.st_blocks >> 1);
  92
  93         /* Don't add in stuff pointed to by symbolic links */
  94         if (S_ISLNK(statbuf.st_mode)) {
  95                 sum = 0L;
  96                 if (du_depth == 1)
  97                         print(sum, filename);
  98         }
  99         if (S_ISDIR(statbuf.st_mode)) {
 100                 DIR *dir;
 101                 struct dirent *entry;
 102
 103                 dir = opendir(filename);
 104                 if (!dir) {
 105                         du_depth--;
 106                         return 0;
 107                 }
 108
 109                 len = strlen(filename);
 110                 if (filename[len - 1] == '/')
 111                         filename[--len] = '\0';
 112
 113                 while ((entry = readdir(dir))) {
 114                         char *newfile;
 115                         char *name = entry->d_name;
 116
 117                         if ((strcmp(name, "..") == 0)
 118                                 || (strcmp(name, ".") == 0)) {
 119                                 continue;
 120                         }
 121                         newfile = concat_path_file(filename, name);
 122                         sum += du(newfile);
 123                         free(newfile);
 124                 }
 125                 closedir(dir);
 126                 print(sum, filename);
 127         }
 128         else if (statbuf.st_nlink > 1 && !count_hardlinks) {
 129                 /* Add files with hard links only once */
 130                 if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
 131                         sum = 0L;
 132                         if (du_depth == 1)
 133                                 print(sum, filename);
 134                 }
 135                 else {
 136                         add_to_ino_dev_hashtable(&statbuf, NULL);
 137                 }
 138         }
 139         du_depth--;
 140         return sum;
 141 }
 142
 143 int du_main(int argc, char **argv)
 144 {
 145         int status = EXIT_SUCCESS;
 146         int i;
 147         int c;
 148
 149         /* default behaviour */
 150         print = print_normal;
 151
 152         /* parse argv[] */
 153         while ((c = getopt(argc, argv, "sl"
 154 #ifdef BB_FEATURE_HUMAN_READABLE
 155 "hm"
 156 #endif
 157 "k")) != EOF) {
 158                         switch (c) {
 159                         case 's':
 160                                         print = print_summary;
 161                                         break;
 162                         case 'l':
 163                                         count_hardlinks = 1;
 164                                         break;
 165 #ifdef BB_FEATURE_HUMAN_READABLE
 166                         case 'h': disp_hr = 0;        break;
 167                         case 'm': disp_hr = MEGABYTE; break;
 168 #endif
 169                         case 'k': break;
 170                         default:
 171                                         show_usage();
 172                         }
 173         }
 174
 175         /* go through remaining args (if any) */
 176         if (optind >= argc) {
 177                 if (du(".") == 0)
 178                         status = EXIT_FAILURE;
 179         } else {
 180                 long sum;
 181
 182                 for (i=optind; i < argc; i++) {
 183                         if ((sum = du(argv[i])) == 0)
 184                                 status = EXIT_FAILURE;
 185                         if(is_directory(argv[i], FALSE, NULL)==FALSE) {
 186                                 print_normal(sum, argv[i]);
 187                         }
 188                         reset_ino_dev_hashtable();
 189                 }
 190         }
 191
 192         return status;
 193 }
 194
 195 /* $Id: du.c,v 1.44 2001/04/09 22:48:11 andersen Exp $ */
 196 /*
 197 Local Variables:
 198 c-file-style: "linux"
 199 c-basic-offset: 4
 200 tab-width: 4
 201 End:
 202 */