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 <errno.h>
  32 #include "busybox.h"
  33 #define BB_DECLARE_EXTERN
  34 #define bb_need_name_too_long
  35 #include "messages.c"
  36
  37
  38 #ifdef BB_FEATURE_HUMAN_READABLE
  39 static unsigned long disp_hr = KILOBYTE;
  40 #endif
  41
  42 typedef void (Display) (long, char *);
  43
  44 static int du_depth = 0;
  45 static int count_hardlinks = 0;
  46
  47 static Display *print;
  48
  49 static void print_normal(long size, char *filename)
  50 {
  51         unsigned long base;
  52 #ifdef BB_FEATURE_HUMAN_READABLE
  53         switch (disp_hr) {
  54                 case MEGABYTE:
  55                         base = KILOBYTE;
  56                         break;
  57                 case KILOBYTE:
  58                         base = 1;
  59                         break;
  60                 default:
  61                         base = 0;
  62         }
  63         printf("%s\t%s\n", make_human_readable_str(size, base), filename);
  64 #else
  65         printf("%ld\t%s\n", size, filename);
  66 #endif
  67 }
  68
  69 static void print_summary(long size, char *filename)
  70 {
  71         if (du_depth == 1) {
  72                 printf("summary\n");
  73                 print_normal(size, filename);
  74         }
  75 }
  76
  77 /* tiny recursive du */
  78 static long du(char *filename)
  79 {
  80         struct stat statbuf;
  81         long sum;
  82         int len;
  83
  84         if ((lstat(filename, &statbuf)) != 0) {
  85                 perror_msg_and_die("%s", filename);
  86         }
  87
  88         du_depth++;
  89         sum = (statbuf.st_blocks >> 1);
  90
  91         /* Don't add in stuff pointed to by symbolic links */
  92         if (S_ISLNK(statbuf.st_mode)) {
  93                 sum = 0L;
  94                 if (du_depth == 1)
  95                         print(sum, filename);
  96         }
  97         if (S_ISDIR(statbuf.st_mode)) {
  98                 DIR *dir;
  99                 struct dirent *entry;
 100
 101                 dir = opendir(filename);
 102                 if (!dir) {
 103                         du_depth--;
 104                         return 0;
 105                 }
 106
 107                 len = strlen(filename);
 108                 if (filename[len - 1] == '/')
 109                         filename[--len] = '\0';
 110
 111                 while ((entry = readdir(dir))) {
 112                         char newfile[BUFSIZ + 1];
 113                         char *name = entry->d_name;
 114
 115                         if ((strcmp(name, "..") == 0)
 116                                 || (strcmp(name, ".") == 0)) {
 117                                 continue;
 118                         }
 119
 120                         if (len + strlen(name) + 1 > BUFSIZ) {
 121                                 error_msg(name_too_long);
 122                                 du_depth--;
 123                                 return 0;
 124                         }
 125                         sprintf(newfile, "%s/%s", filename, name);
 126
 127                         sum += du(newfile);
 128                 }
 129                 closedir(dir);
 130                 print(sum, filename);
 131         }
 132         else if (statbuf.st_nlink > 1 && !count_hardlinks) {
 133                 /* Add files with hard links only once */
 134                 if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
 135                         sum = 0L;
 136                         if (du_depth == 1)
 137                                 print(sum, filename);
 138                 }
 139                 else {
 140                         add_to_ino_dev_hashtable(&statbuf, NULL);
 141                 }
 142         }
 143         du_depth--;
 144         return sum;
 145 }
 146
 147 int du_main(int argc, char **argv)
 148 {
 149         int status = EXIT_SUCCESS;
 150         int i;
 151         int c;
 152
 153         /* default behaviour */
 154         print = print_normal;
 155
 156         /* parse argv[] */
 157         while ((c = getopt(argc, argv, "sl"
 158 #ifdef BB_FEATURE_HUMAN_READABLE
 159 "hm"
 160 #endif
 161 "k")) != EOF) {
 162                         switch (c) {
 163                         case 's':
 164                                         print = print_summary;
 165                                         break;
 166                         case 'l':
 167                                         count_hardlinks = 1;
 168                                         break;
 169 #ifdef BB_FEATURE_HUMAN_READABLE
 170                         case 'h': disp_hr = 0;        break;
 171                         case 'm': disp_hr = MEGABYTE; break;
 172 #endif
 173                         case 'k': break;
 174                         default:
 175                                         show_usage();
 176                         }
 177         }
 178
 179         /* go through remaining args (if any) */
 180         if (optind >= argc) {
 181                 if (du(".") == 0)
 182                         status = EXIT_FAILURE;
 183         } else {
 184                 long sum;
 185
 186                 for (i=optind; i < argc; i++) {
 187                         if ((sum = du(argv[i])) == 0)
 188                                 status = EXIT_FAILURE;
 189                         if(is_directory(argv[i], FALSE, NULL)==FALSE) {
 190                                 print_normal(sum, argv[i]);
 191                         }
 192                         reset_ino_dev_hashtable();
 193                 }
 194         }
 195
 196         return status;
 197 }
 198
 199 /* $Id: du.c,v 1.42 2001/03/07 17:42:07 markw Exp $ */
 200 /*
 201 Local Variables:
 202 c-file-style: "linux"
 203 c-basic-offset: 4
 204 tab-width: 4
 205 End:
 206 */