userapps/opensource/busybox/coreutils/df.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini df implementation for busybox
   4  *
   5  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6  * based on original code by (I think) Bruce Perens <bruce@pixar.com>.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  21  *
  22  */
  23
  24 /* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing.  Also blocksize. */
  25 /* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
  26
  27 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  28  *
  29  * Size reduction.  Removed floating point dependency.  Added error checking
  30  * on output.  Output stats on 0-sized filesystems if specifically listed on
  31  * the command line.  Properly round *-blocks, Used, and Available quantities.
  32  */
  33
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <unistd.h>
  38 #include <mntent.h>
  39 #include <sys/vfs.h>
  40 #include "busybox.h"
  41
  42 #ifndef CONFIG_FEATURE_HUMAN_READABLE
  43 static long kscale(long b, long bs)
  44 {
  45         return ( b * (long long) bs + KILOBYTE/2 ) / KILOBYTE;
  46 }
  47 #endif
  48
  49 extern int df_main(int argc, char **argv)
  50 {
  51         long blocks_used;
  52         long blocks_percent_used;
  53 #ifdef CONFIG_FEATURE_HUMAN_READABLE
  54         unsigned long df_disp_hr = KILOBYTE;
  55 #endif
  56         int status = EXIT_SUCCESS;
  57         unsigned long opt;
  58         FILE *mount_table;
  59         struct mntent *mount_entry;
  60         struct statfs s;
  61         static const char hdr_1k[] = "1k-blocks"; /* default display is kilobytes */
  62         const char *disp_units_hdr = hdr_1k;
  63
  64 #ifdef CONFIG_FEATURE_HUMAN_READABLE
  65         bb_opt_complementaly = "h-km:k-hm:m-hk";
  66         opt = bb_getopt_ulflags(argc, argv, "hmk");
  67         if(opt & 1) {
  68                                 df_disp_hr = 0;
  69                                 disp_units_hdr = "     Size";
  70         }
  71         if(opt & 2) {
  72                                 df_disp_hr = MEGABYTE;
  73                                 disp_units_hdr = "1M-blocks";
  74         }
  75 #else
  76         opt = bb_getopt_ulflags(argc, argv, "k");
  77 #endif
  78
  79         bb_printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
  80                           "", disp_units_hdr);
  81
  82         mount_table = NULL;
  83         argv += optind;
  84         if (optind >= argc) {
  85                 if (!(mount_table = setmntent(bb_path_mtab_file, "r"))) {
  86                         bb_perror_msg_and_die(bb_path_mtab_file);
  87                 }
  88         }
  89
  90         do {
  91                 const char *device;
  92                 const char *mount_point;
  93
  94                 if (mount_table) {
  95                         if (!(mount_entry = getmntent(mount_table))) {
  96                                 endmntent(mount_table);
  97                                 break;
  98                         }
  99                 } else {
 100                         if (!(mount_point = *argv++)) {
 101                                 break;
 102                         }
 103                         if (!(mount_entry = find_mount_point(mount_point, bb_path_mtab_file))) {
 104                                 bb_error_msg("%s: can't find mount point.", mount_point);
 105                         SET_ERROR:
 106                                 status = EXIT_FAILURE;
 107                                 continue;
 108                         }
 109                 }
 110
 111                 device = mount_entry->mnt_fsname;
 112                 mount_point = mount_entry->mnt_dir;
 113
 114                 if (statfs(mount_point, &s) != 0) {
 115                         bb_perror_msg("%s", mount_point);
 116                         goto SET_ERROR;
 117                 }
 118
 119                 if ((s.f_blocks > 0) || !mount_table){
 120                         blocks_used = s.f_blocks - s.f_bfree;
 121                         blocks_percent_used = 0;
 122                         if (blocks_used + s.f_bavail) {
 123                                 blocks_percent_used = (((long long) blocks_used) * 100
 124                                                                            + (blocks_used + s.f_bavail)/2
 125                                                                            ) / (blocks_used + s.f_bavail);
 126                         }
 127
 128                         if (strcmp(device, "rootfs") == 0) {
 129                                 continue;
 130                         } else if (strcmp(device, "/dev/root") == 0) {
 131                                 /* Adjusts device to be the real root device,
 132                                 * or leaves device alone if it can't find it */
 133                                 if ((device = find_real_root_device_name()) == NULL) {
 134                                         goto SET_ERROR;
 135                                 }
 136                         }
 137
 138 #ifdef CONFIG_FEATURE_HUMAN_READABLE
 139                         bb_printf("%-21s%9s ", device,
 140                                           make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
 141
 142                         bb_printf("%9s ",
 143                                           make_human_readable_str( (s.f_blocks - s.f_bfree),
 144                                                                                           s.f_bsize, df_disp_hr));
 145
 146                         bb_printf("%9s %3ld%% %s\n",
 147                                           make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
 148                                           blocks_percent_used, mount_point);
 149 #else
 150                         bb_printf("%-21s%9ld %9ld %9ld %3ld%% %s\n",
 151                                           device,
 152                                           kscale(s.f_blocks, s.f_bsize),
 153                                           kscale(s.f_blocks-s.f_bfree, s.f_bsize),
 154                                           kscale(s.f_bavail, s.f_bsize),
 155                                           blocks_percent_used, mount_point);
 156 #endif
 157                 }
 158
 159         } while (1);
 160
 161         bb_fflush_stdout_and_exit(status);
 162 }
 163
 164 /*
 165 Local Variables:
 166 c-file-style: "linux"
 167 c-basic-offset: 4
 168 tab-width: 4
 169 End:
 170 */