coreutils/du.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini du implementation for busybox
   4  *
   5  *
   6  * Copyright (C) 1999,2000 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 "busybox.h"
  26 #define BB_DECLARE_EXTERN
  27 #define bb_need_name_too_long
  28 #include "messages.c"
  29
  30 #include <sys/types.h>
  31 #include <fcntl.h>
  32 #include <dirent.h>
  33 #include <stdio.h>
  34 #include <errno.h>
  35
  36 #ifdef BB_FEATURE_HUMAN_READABLE
  37 unsigned long du_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 #ifdef BB_FEATURE_HUMAN_READABLE
  50         printf("%s\t%s\n", format((size * KILOBYTE), du_disp_hr), filename);
  51 #else
  52         printf("%ld\t%s\n", size, filename);
  53 #endif
  54 }
  55
  56 static void print_summary(long size, char *filename)
  57 {
  58         if (du_depth == 1) {
  59 printf("summary\n");
  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         int len;
  70
  71         if ((lstat(filename, &statbuf)) != 0) {
  72                 perror_msg_and_die("%s", filename);
  73         }
  74
  75         du_depth++;
  76         sum = (statbuf.st_blocks >> 1);
  77
  78         /* Don't add in stuff pointed to by symbolic links */
  79         if (S_ISLNK(statbuf.st_mode)) {
  80                 sum = 0L;
  81                 if (du_depth == 1)
  82                         print(sum, filename);
  83         }
  84         if (S_ISDIR(statbuf.st_mode)) {
  85                 DIR *dir;
  86                 struct dirent *entry;
  87
  88                 dir = opendir(filename);
  89                 if (!dir) {
  90                         du_depth--;
  91                         return 0;
  92                 }
  93
  94                 len = strlen(filename);
  95                 if (filename[len - 1] == '/')
  96                         filename[--len] = '\0';
  97
  98                 while ((entry = readdir(dir))) {
  99                         char newfile[BUFSIZ + 1];
 100                         char *name = entry->d_name;
 101
 102                         if ((strcmp(name, "..") == 0)
 103                                 || (strcmp(name, ".") == 0)) {
 104                                 continue;
 105                         }
 106
 107                         if (len + strlen(name) + 1 > BUFSIZ) {
 108                                 error_msg(name_too_long);
 109                                 du_depth--;
 110                                 return 0;
 111                         }
 112                         sprintf(newfile, "%s/%s", filename, name);
 113
 114                         sum += du(newfile);
 115                 }
 116                 closedir(dir);
 117                 print(sum, filename);
 118         }
 119         else if (statbuf.st_nlink > 1 && !count_hardlinks) {
 120                 /* Add files with hard links only once */
 121                 if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
 122                         sum = 0L;
 123                         if (du_depth == 1)
 124                                 print(sum, filename);
 125                 }
 126                 else {
 127                         add_to_ino_dev_hashtable(&statbuf, NULL);
 128                 }
 129         }
 130         du_depth--;
 131         return sum;
 132 }
 133
 134 int du_main(int argc, char **argv)
 135 {
 136         int status = EXIT_SUCCESS;
 137         int i;
 138         int c;
 139
 140         /* default behaviour */
 141         print = print_normal;
 142
 143         /* parse argv[] */
 144         while ((c = getopt(argc, argv, "sl"
 145 #ifdef BB_FEATURE_HUMAN_READABLE
 146 "hm"
 147 #endif
 148 "k")) != EOF) {
 149                         switch (c) {
 150                         case 's':
 151                                         print = print_summary;
 152                                         break;
 153                         case 'l':
 154                                         count_hardlinks = 1;
 155                                         break;
 156 #ifdef BB_FEATURE_HUMAN_READABLE
 157                         case 'h': du_disp_hr = 0;        break;
 158                         case 'm': du_disp_hr = MEGABYTE; break;
 159                         case 'k': du_disp_hr = KILOBYTE; break;
 160 #else
 161                         case 'k': break;
 162 #endif
 163                         default:
 164                                         usage(du_usage);
 165                         }
 166         }
 167
 168         /* go through remaining args (if any) */
 169         if (optind >= argc) {
 170                 if (du(".") == 0)
 171                         status = EXIT_FAILURE;
 172         } else {
 173                 long sum;
 174
 175                 for (i=optind; i < argc; i++) {
 176                         if ((sum = du(argv[i])) == 0)
 177                                 status = EXIT_FAILURE;
 178                         if(is_directory(argv[i], FALSE, NULL)==FALSE) {
 179                                 print_normal(sum, argv[i]);
 180                         }
 181                         reset_ino_dev_hashtable();
 182                 }
 183         }
 184
 185         return status;
 186 }
 187
 188 /* $Id: du.c,v 1.34 2001/01/22 22:35:38 rjune Exp $ */
 189 /*
 190 Local Variables:
 191 c-file-style: "linux"
 192 c-basic-offset: 4
 193 tab-width: 4
 194 End:
 195 */