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
  44         if (statfs(mount_point, &s) != 0) {
  45                 perror_msg("%s", mount_point);
  46                 return FALSE;
  47         }
  48
  49         if (s.f_blocks > 0) {
  50                 blocks_used = s.f_blocks - s.f_bfree;
  51                 if(blocks_used == 0)
  52                         blocks_percent_used = 0;
  53                 else {
  54                         blocks_percent_used = (long)
  55                           (blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
  56                 }
  57                 if (strcmp(device, "/dev/root") == 0) {
  58                         /* Adjusts device to be the real root device,
  59                          * or leaves device alone if it can't find it */
  60                         device = find_real_root_device_name(device);
  61                         if(device==NULL)
  62                                 return FALSE;
  63                 }
  64 #ifdef BB_FEATURE_HUMAN_READABLE
  65                 printf("%-20s %9s ", device,
  66                                 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
  67
  68                 printf("%9s ",
  69                                 make_human_readable_str( (s.f_blocks - s.f_bfree), s.f_bsize, df_disp_hr));
  70
  71                 printf("%9s %3ld%% %s\n",
  72                                 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
  73                                 blocks_percent_used, mount_point);
  74 #else
  75                 printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
  76                                 device,
  77                                 (long) (s.f_blocks * (s.f_bsize / (double)KILOBYTE)),
  78                                 (long) ((s.f_blocks - s.f_bfree)*(s.f_bsize/(double)KILOBYTE)),
  79                                 (long) (s.f_bavail * (s.f_bsize / (double)KILOBYTE)),
  80                                 blocks_percent_used, mount_point);
  81 #endif
  82         }
  83
  84         return TRUE;
  85 }
  86
  87 extern int df_main(int argc, char **argv)
  88 {
  89         int status = EXIT_SUCCESS;
  90         int opt = 0;
  91         int i = 0;
  92         char disp_units_hdr[80] = "1k-blocks"; /* default display is kilobytes */
  93
  94         while ((opt = getopt(argc, argv, "k"
  95 #ifdef BB_FEATURE_HUMAN_READABLE
  96         "hm"
  97 #endif
  98 )) > 0)
  99         {
 100                 switch (opt) {
 101 #ifdef BB_FEATURE_HUMAN_READABLE
 102                         case 'h':
 103                                 df_disp_hr = 0;
 104                                 strcpy(disp_units_hdr, "     Size");
 105                                 break;
 106                         case 'm':
 107                                 df_disp_hr = MEGABYTE;
 108                                 strcpy(disp_units_hdr, "1M-blocks");
 109                                 break;
 110 #endif
 111                         case 'k':
 112                                 /* default display is kilobytes */
 113                                 break;
 114                         default:
 115                                           show_usage();
 116                 }
 117         }
 118
 119         printf("%-20s %-14s %s %s %s %s\n", "Filesystem", disp_units_hdr,
 120                "Used", "Available", "Use%", "Mounted on");
 121
 122         if(optind < argc) {
 123                 struct mntent *mount_entry;
 124                 for(i = optind; i < argc; i++)
 125                 {
 126                         if ((mount_entry = find_mount_point(argv[i], mtab_file)) == 0) {
 127                                 error_msg("%s: can't find mount point.", argv[i]);
 128                                 status = EXIT_FAILURE;
 129                         } else if (!do_df(mount_entry->mnt_fsname, mount_entry->mnt_dir))
 130                                 status = EXIT_FAILURE;
 131                 }
 132         } else {
 133                 FILE *mount_table;
 134                 struct mntent *mount_entry;
 135
 136                 mount_table = setmntent(mtab_file, "r");
 137                 if (mount_table == 0) {
 138                         perror_msg("%s", mtab_file);
 139                         return EXIT_FAILURE;
 140                 }
 141
 142                 while ((mount_entry = getmntent(mount_table))) {
 143                         if (!do_df(mount_entry->mnt_fsname, mount_entry->mnt_dir))
 144                                 status = EXIT_FAILURE;
 145                 }
 146                 endmntent(mount_table);
 147         }
 148
 149         return status;
 150 }
 151
 152 /*
 153 Local Variables:
 154 c-file-style: "linux"
 155 c-basic-offset: 4
 156 tab-width: 4
 157 End:
 158 */