coreutils/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. and Erik Andersen
   6  * Copyright (C) 1999,2000,2001 by Erik Andersen <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 /* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing.  Also blocksize. */
  26 /* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
  27
  28 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  29  *
  30  * Size reduction.  Removed floating point dependency.  Added error checking
  31  * on output.  Output stats on 0-sized filesystems if specificly listed on
  32  * the command line.  Properly round *-blocks, Used, and Available quantities.
  33  */
  34
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include <unistd.h>
  39 #include <mntent.h>
  40 #include <sys/vfs.h>
  41 #include "busybox.h"
  42
  43 #ifndef CONFIG_FEATURE_HUMAN_READABLE
  44 static long kscale(long b, long bs)
  45 {
  46         return ( b * (long long) bs + KILOBYTE/2 ) / KILOBYTE;
  47 }
  48 #endif
  49
  50 extern int df_main(int argc, char **argv)
  51 {
  52         long blocks_used;
  53         long blocks_percent_used;
  54 #ifdef CONFIG_FEATURE_HUMAN_READABLE
  55         unsigned long df_disp_hr = KILOBYTE;
  56 #endif
  57         int status = EXIT_SUCCESS;
  58         unsigned long opt;
  59         FILE *mount_table;
  60         struct mntent *mount_entry;
  61         struct statfs s;
  62         static const char hdr_1k[] = "1k-blocks"; /* default display is kilobytes */
  63         const char *disp_units_hdr = hdr_1k;
  64
  65 #ifdef CONFIG_FEATURE_HUMAN_READABLE
  66         bb_opt_complementaly = "h-km:k-hm:m-hk";
  67         opt = bb_getopt_ulflags(argc, argv, "hmk");
  68         if(opt & 1) {
  69                                 df_disp_hr = 0;
  70                                 disp_units_hdr = "     Size";
  71         }
  72         if(opt & 2) {
  73                                 df_disp_hr = MEGABYTE;
  74                                 disp_units_hdr = "1M-blocks";
  75         }
  76 #else
  77         opt = bb_getopt_ulflags(argc, argv, "k");
  78 #endif
  79
  80         bb_printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
  81                           "", disp_units_hdr);
  82
  83         mount_table = NULL;
  84         argv += optind;
  85         if (optind >= argc) {
  86                 if (!(mount_table = setmntent(bb_path_mtab_file, "r"))) {
  87                         bb_perror_msg_and_die(bb_path_mtab_file);
  88                 }
  89         }
  90
  91         do {
  92                 const char *device;
  93                 const char *mount_point;
  94
  95                 if (mount_table) {
  96                         if (!(mount_entry = getmntent(mount_table))) {
  97                                 endmntent(mount_table);
  98                                 break;
  99                         }
 100                 } else {
 101                         if (!(mount_point = *argv++)) {
 102                                 break;
 103                         }
 104                         if (!(mount_entry = find_mount_point(mount_point, bb_path_mtab_file))) {
 105                                 bb_error_msg("%s: can't find mount point.", mount_point);
 106                         SET_ERROR:
 107                                 status = EXIT_FAILURE;
 108                                 continue;
 109                         }
 110                 }
 111
 112                 device = mount_entry->mnt_fsname;
 113                 mount_point = mount_entry->mnt_dir;
 114
 115                 if (statfs(mount_point, &s) != 0) {
 116                         bb_perror_msg("%s", mount_point);
 117                         goto SET_ERROR;
 118                 }
 119
 120                 if ((s.f_blocks > 0) || !mount_table){
 121                         blocks_used = s.f_blocks - s.f_bfree;
 122                         blocks_percent_used = 0;
 123                         if (blocks_used + s.f_bavail) {
 124                                 blocks_percent_used = (((long long) blocks_used) * 100
 125                                                                            + (blocks_used + s.f_bavail)/2
 126                                                                            ) / (blocks_used + s.f_bavail);
 127                         }
 128
 129                         if (strcmp(device, "rootfs") == 0) {
 130                                 continue;
 131                         } else if (strcmp(device, "/dev/root") == 0) {
 132                                 /* Adjusts device to be the real root device,
 133                                 * or leaves device alone if it can't find it */
 134                                 if ((device = find_real_root_device_name(device)) == NULL) {
 135                                         goto SET_ERROR;
 136                                 }
 137                         }
 138
 139 #ifdef CONFIG_FEATURE_HUMAN_READABLE
 140                         bb_printf("%-21s%9s ", device,
 141                                           make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
 142
 143                         bb_printf("%9s ",
 144                                           make_human_readable_str( (s.f_blocks - s.f_bfree),
 145                                                                                           s.f_bsize, df_disp_hr));
 146
 147                         bb_printf("%9s %3ld%% %s\n",
 148                                           make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
 149                                           blocks_percent_used, mount_point);
 150 #else
 151                         bb_printf("%-21s%9ld %9ld %9ld %3ld%% %s\n",
 152                                           device,
 153                                           kscale(s.f_blocks, s.f_bsize),
 154                                           kscale(s.f_blocks-s.f_bfree, s.f_bsize),
 155                                           kscale(s.f_bavail, s.f_bsize),
 156                                           blocks_percent_used, mount_point);
 157 #endif
 158                 }
 159
 160         } while (1);
 161
 162         bb_fflush_stdout_and_exit(status);
 163 }
 164
 165 /*
 166 Local Variables:
 167 c-file-style: "linux"
 168 c-basic-offset: 4
 169 tab-width: 4
 170 End:
 171 */