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 "internal.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 typedef void (Display) (long, char *);
  37
  38 static const char du_usage[] =
  39         "du [OPTION]... [FILE]...\n\n"
  40         "Summarize disk space used for each FILE and/or directory.\n"
  41         "Disk space is printed in units of 1024 bytes.\n\n"
  42         "Options:\n"
  43         "\t-l\tcount sizes many times if hard linked\n"
  44         "\t-s\tdisplay only a total for each argument\n";
  45
  46 static int du_depth = 0;
  47 static int count_hardlinks = 0;
  48
  49 static Display *print;
  50
  51 static void print_normal(long size, char *filename)
  52 {
  53         fprintf(stdout, "%ld\t%s\n", size, filename);
  54 }
  55
  56 static void print_summary(long size, char *filename)
  57 {
  58         if (du_depth == 1) {
  59                 print_normal(size, filename);
  60         }
  61 }
  62
  63 /* tiny recursive du */
  64 static long du(char *filename)
  65 {
  66         struct stat statbuf;
  67         long sum;
  68         int len;
  69
  70         if ((lstat(filename, &statbuf)) != 0) {
  71                 printf("du: %s: %s\n", filename, strerror(errno));
  72                 return 0;
  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                                 fprintf(stderr, name_too_long, "du");
 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 i;
 137         char opt;
 138
 139         /* default behaviour */
 140         print = print_normal;
 141
 142         /* parse argv[] */
 143         for (i = 1; i < argc; i++) {
 144                 if (argv[i][0] == '-') {
 145                         opt = argv[i][1];
 146                         switch (opt) {
 147                         case 's':
 148                                 print = print_summary;
 149                                 break;
 150                         case 'l':
 151                                 count_hardlinks = 1;
 152                                 break;
 153                         case 'h':
 154                         case '-':
 155                                 usage(du_usage);
 156                                 break;
 157                         default:
 158                                 fprintf(stderr, "du: invalid option -- %c\n", opt);
 159                                 usage(du_usage);
 160                         }
 161                 } else {
 162                         break;
 163                 }
 164         }
 165
 166         /* go through remaining args (if any) */
 167         if (i >= argc) {
 168                 du(".");
 169         } else {
 170                 long sum;
 171
 172                 for (; i < argc; i++) {
 173                         sum = du(argv[i]);
 174                         if (sum && isDirectory(argv[i], FALSE, NULL)) {
 175                                 print_normal(sum, argv[i]);
 176                         }
 177                         reset_ino_dev_hashtable();
 178                 }
 179         }
 180
 181         exit(0);
 182 }
 183
 184 /* $Id: du.c,v 1.18 2000/04/28 00:18:56 erik Exp $ */
 185 /*
 186 Local Variables:
 187 c-file-style: "linux"
 188 c-basic-offset: 4
 189 tab-width: 4
 190 End:
 191 */