df.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini df implementation for busybox
   4  *
   5  * Copyright (C) 1999,2000 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 "busybox.h"
  26 #include <stdio.h>
  27 #include <mntent.h>
  28 #include <sys/vfs.h>
  29
  30 extern const char mtab_file[];  /* Defined in utility.c */
  31 #ifdef BB_FEATURE_HUMAN_READABLE
  32 unsigned long disp_hr = KILOBYTE;
  33 #endif
  34
  35 static int df(char *device, const char *mountPoint)
  36 {
  37         struct statfs s;
  38         long blocks_used;
  39         long blocks_percent_used;
  40
  41         if (statfs(mountPoint, &s) != 0) {
  42                 perror_msg("%s", mountPoint);
  43                 return FALSE;
  44         }
  45
  46         if (s.f_blocks > 0) {
  47                 blocks_used = s.f_blocks - s.f_bfree;
  48                 if(0 == blocks_used)
  49                         blocks_percent_used = 0;
  50                 else
  51                         blocks_percent_used = (long)
  52                           (blocks_used * 100.0 / (blocks_used + s.f_bavail) + 0.5);
  53                 if (strcmp(device, "/dev/root") == 0) {
  54                         /* Adjusts device to be the real root device,
  55                          * or leaves device alone if it can't find it */
  56                         find_real_root_device_name( device);
  57                 }
  58 #ifdef BB_FEATURE_HUMAN_READABLE
  59                 printf("%-20s %9s",
  60                            device,
  61                            format((s.f_blocks * s.f_bsize), disp_hr));
  62                 printf(" %9s", format((s.f_blocks - s.f_bfree) * s.f_bsize, disp_hr));
  63                 printf(" %9s %3ld%% %s\n",
  64                            format(s.f_bavail * s.f_bsize, disp_hr),
  65                            blocks_percent_used, mountPoint);
  66 #else
  67                 printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
  68                            device,
  69                            (long) (s.f_blocks * (s.f_bsize / 1024.0)),
  70                            (long) ((s.f_blocks - s.f_bfree) * (s.f_bsize / 1024.0)),
  71                            (long) (s.f_bavail * (s.f_bsize / 1024.0)),
  72                            blocks_percent_used, mountPoint);
  73 #endif
  74
  75         }
  76
  77         return TRUE;
  78 }
  79
  80 extern int df_main(int argc, char **argv)
  81 {
  82         int status = EXIT_SUCCESS;
  83         int opt = 0;
  84         int i = 0;
  85
  86         while ((opt = getopt(argc, argv, "?"
  87 #ifdef BB_FEATURE_HUMAN_READABLE
  88         "hm"
  89 #endif
  90         "k"
  91 )) > 0)
  92         {
  93                 switch (opt) {
  94 #ifdef BB_FEATURE_HUMAN_READABLE
  95                         case 'h': disp_hr = 0;         break;
  96                         case 'm': disp_hr = MEGABYTE;  break;
  97                         case 'k': disp_hr = KILOBYTE;  break;
  98 #else
  99                         case 'k': break;
 100 #endif
 101                         case '?': goto print_df_usage; break;
 102                 }
 103         }
 104
 105         printf("%-20s %-14s %s %s %s %s\n", "Filesystem",
 106 #ifdef BB_FEATURE_HUMAN_READABLE
 107                    (KILOBYTE == disp_hr) ? "1k-blocks" : "     Size",
 108 #else
 109                    "1k-blocks",
 110 #endif
 111                "Used", "Available", "Use%", "Mounted on");
 112
 113
 114         if(optind < argc) {
 115                 struct mntent *mountEntry;
 116                 for(i = optind; i < argc; i++)
 117                 {
 118                         if ((mountEntry = find_mount_point(argv[i], mtab_file)) == 0) {
 119                                 error_msg("%s: can't find mount point.\n", argv[i]);
 120                                 status = EXIT_FAILURE;
 121                         } else if (!df(mountEntry->mnt_fsname, mountEntry->mnt_dir))
 122                                 status = EXIT_FAILURE;
 123                 }
 124         } else {
 125                 FILE *mountTable;
 126                 struct mntent *mountEntry;
 127
 128                 mountTable = setmntent(mtab_file, "r");
 129                 if (mountTable == 0) {
 130                         perror_msg("%s", mtab_file);
 131                         return EXIT_FAILURE;
 132                 }
 133
 134                 while ((mountEntry = getmntent(mountTable))) {
 135                         if (!df(mountEntry->mnt_fsname, mountEntry->mnt_dir))
 136                                 status = EXIT_FAILURE;
 137                 }
 138                 endmntent(mountTable);
 139         }
 140
 141         return status;
 142
 143 print_df_usage:
 144     usage(df_usage);
 145     return(FALSE);
 146 }
 147
 148 /*
 149 Local Variables:
 150 c-file-style: "linux"
 151 c-basic-offset: 4
 152 tab-width: 4
 153 End:
 154 */