coreutils/df.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini df implementation for busybox
   4  *
   5  * Copyright (C) 1999,2000,2001 by Lineo, inc.
   6  * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org>
   7  * based on original code by (I think) Bruce Perens <bruce@pixar.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 <stdio.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <mntent.h>
  29 #include <sys/vfs.h>
  30 #include <getopt.h>
  31 #include "busybox.h"
  32
  33 extern const char mtab_file[];  /* Defined in utility.c */
  34 #ifdef BB_FEATURE_HUMAN_READABLE
  35 static unsigned long df_disp_hr = KILOBYTE;
  36 #endif
  37
  38 static int do_df(char *device, const char *mount_point)
  39 {
  40         struct statfs s;
  41         long blocks_used;
  42         long blocks_percent_used;
  43 #ifdef BB_FEATURE_HUMAN_READABLE
  44         long base;
  45 #endif
  46
  47         if (statfs(mount_point, &s) != 0) {
  48                 perror_msg("%s", mount_point);
  49                 return FALSE;
  50         }
  51
  52         if (s.f_blocks > 0) {
  53                 blocks_used = s.f_blocks - s.f_bfree;
  54                 if(blocks_used == 0)
  55                         blocks_percent_used = 0;
  56                 else {
  57                         blocks_percent_used = (long)
  58                           (blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
  59                 }
  60                 if (strcmp(device, "/dev/root") == 0) {
  61                         /* Adjusts device to be the real root device,
  62                          * or leaves device alone if it can't find it */
  63                         device = find_real_root_device_name(device);
  64                         if(device==NULL)
  65                                 return FALSE;
  66                 }
  67 #ifdef BB_FEATURE_HUMAN_READABLE
  68                 switch (df_disp_hr) {
  69                         case MEGABYTE:
  70                                 base = KILOBYTE;
  71                                 break;
  72                         case KILOBYTE:
  73                                 base = 1;
  74                                 break;
  75                         default:
  76                                 base = 0;
  77                 }
  78                 printf("%-20s %9s ", device,
  79                            make_human_readable_str((unsigned long)(s.f_blocks *
  80                                            (s.f_bsize/(double)KILOBYTE)), base));
  81                 printf("%9s ",
  82                            make_human_readable_str((unsigned long)(
  83                                            (s.f_blocks - s.f_bfree) *
  84                                            (s.f_bsize/(double)KILOBYTE)), base));
  85                 printf("%9s %3ld%% %s\n",
  86                            make_human_readable_str((unsigned long)(s.f_bavail *
  87                                            (s.f_bsize/(double)KILOBYTE)), base),
  88                            blocks_percent_used, mount_point);
  89 #else
  90                 printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
  91                                 device,
  92                                 (long) (s.f_blocks * (s.f_bsize / (double)KILOBYTE)),
  93                                 (long) ((s.f_blocks - s.f_bfree)*(s.f_bsize/(double)KILOBYTE)),
  94                                 (long) (s.f_bavail * (s.f_bsize / (double)KILOBYTE)),
  95                                 blocks_percent_used, mount_point);
  96 #endif
  97         }
  98
  99         return TRUE;
 100 }
 101
 102 extern int df_main(int argc, char **argv)
 103 {
 104         int status = EXIT_SUCCESS;
 105         int opt = 0;
 106         int i = 0;
 107         char disp_units_hdr[80] = "1k-blocks"; /* default display is kilobytes */
 108
 109         while ((opt = getopt(argc, argv, "k"
 110 #ifdef BB_FEATURE_HUMAN_READABLE
 111         "hm"
 112 #endif
 113 )) > 0)
 114         {
 115                 switch (opt) {
 116 #ifdef BB_FEATURE_HUMAN_READABLE
 117                         case 'h':
 118                                 df_disp_hr = 0;
 119                                 strcpy(disp_units_hdr, "     Size");
 120                                 break;
 121                         case 'm':
 122                                 df_disp_hr = MEGABYTE;
 123                                 strcpy(disp_units_hdr, "1M-blocks");
 124                                 break;
 125 #endif
 126                         case 'k':
 127                                 /* default display is kilobytes */
 128                                 break;
 129                         default:
 130                                           show_usage();
 131                 }
 132         }
 133
 134         printf("%-20s %-14s %s %s %s %s\n", "Filesystem", disp_units_hdr,
 135                "Used", "Available", "Use%", "Mounted on");
 136
 137         if(optind < argc) {
 138                 struct mntent *mount_entry;
 139                 for(i = optind; i < argc; i++)
 140                 {
 141                         if ((mount_entry = find_mount_point(argv[i], mtab_file)) == 0) {
 142                                 error_msg("%s: can't find mount point.", argv[i]);
 143                                 status = EXIT_FAILURE;
 144                         } else if (!do_df(mount_entry->mnt_fsname, mount_entry->mnt_dir))
 145                                 status = EXIT_FAILURE;
 146                 }
 147         } else {
 148                 FILE *mount_table;
 149                 struct mntent *mount_entry;
 150
 151                 mount_table = setmntent(mtab_file, "r");
 152                 if (mount_table == 0) {
 153                         perror_msg("%s", mtab_file);
 154                         return EXIT_FAILURE;
 155                 }
 156
 157                 while ((mount_entry = getmntent(mount_table))) {
 158                         if (!do_df(mount_entry->mnt_fsname, mount_entry->mnt_dir))
 159                                 status = EXIT_FAILURE;
 160                 }
 161                 endmntent(mount_table);
 162         }
 163
 164         return status;
 165 }
 166
 167 /*
 168 Local Variables:
 169 c-file-style: "linux"
 170 c-basic-offset: 4
 171 tab-width: 4
 172 End:
 173 */