git.maemo.org Git - busybox4maemo/blob - 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  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   9  */
  10
  11 /* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing.  Also blocksize. */
  12 /* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
  13
  14 /* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
  15  *
  16  * Size reduction.  Removed floating point dependency.  Added error checking
  17  * on output.  Output stats on 0-sized filesystems if specifically listed on
  18  * the command line.  Properly round *-blocks, Used, and Available quantities.
  19  */
  20
  21 #include <mntent.h>
  22 #include <sys/vfs.h>
  23 #include "libbb.h"
  24
  25 #if !ENABLE_FEATURE_HUMAN_READABLE
  26 static unsigned long kscale(unsigned long b, unsigned long bs)
  27 {
  28         return (b * (unsigned long long) bs + 1024/2) / 1024;
  29 }
  30 #endif
  31
  32 int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  33 int df_main(int argc, char **argv)
  34 {
  35         unsigned long blocks_used;
  36         unsigned blocks_percent_used;
  37 #if ENABLE_FEATURE_HUMAN_READABLE
  38         unsigned df_disp_hr = 1024;
  39 #endif
  40         int status = EXIT_SUCCESS;
  41         unsigned opt;
  42         FILE *mount_table;
  43         struct mntent *mount_entry;
  44         struct statfs s;
  45         /* default display is kilobytes */
  46         const char *disp_units_hdr = "1k-blocks";
  47
  48         enum {
  49                 OPT_ALL = (1 << 0),
  50                 OPT_INODE = (ENABLE_FEATURE_HUMAN_READABLE ? (1 << 4) : (1 << 2))
  51                             * ENABLE_FEATURE_DF_INODE
  52         };
  53
  54 #if ENABLE_FEATURE_HUMAN_READABLE
  55         opt_complementary = "h-km:k-hm:m-hk";
  56         opt = getopt32(argv, "ahmk" USE_FEATURE_DF_INODE("i"));
  57         if (opt & (1 << 1)) { // -h
  58                 df_disp_hr = 0;
  59                 disp_units_hdr = "     Size";
  60         }
  61         if (opt & (1 << 2)) { // -m
  62                 df_disp_hr = 1024*1024;
  63                 disp_units_hdr = "1M-blocks";
  64         }
  65         if (opt & OPT_INODE) {
  66                 disp_units_hdr = "   Inodes";
  67         }
  68 #else
  69         opt = getopt32(argv, "ak" USE_FEATURE_DF_INODE("i"));
  70 #endif
  71
  72         printf("Filesystem           %-15sUsed Available Use%% Mounted on\n",
  73                         disp_units_hdr);
  74
  75         mount_table = NULL;
  76         argv += optind;
  77         if (optind >= argc) {
  78                 mount_table = setmntent(bb_path_mtab_file, "r");
  79                 if (!mount_table) {
  80                         bb_perror_msg_and_die(bb_path_mtab_file);
  81                 }
  82         }
  83
  84         while (1) {
  85                 const char *device;
  86                 const char *mount_point;
  87
  88                 if (mount_table) {
  89                         mount_entry = getmntent(mount_table);
  90                         if (!mount_entry) {
  91                                 endmntent(mount_table);
  92                                 break;
  93                         }
  94                 } else {
  95                         mount_point = *argv++;
  96                         if (!mount_point) {
  97                                 break;
  98                         }
  99                         mount_entry = find_mount_point(mount_point, bb_path_mtab_file);
 100                         if (!mount_entry) {
 101                                 bb_error_msg("%s: can't find mount point", mount_point);
 102  SET_ERROR:
 103                                 status = EXIT_FAILURE;
 104                                 continue;
 105                         }
 106                 }
 107
 108                 device = mount_entry->mnt_fsname;
 109                 mount_point = mount_entry->mnt_dir;
 110
 111                 if (statfs(mount_point, &s) != 0) {
 112                         bb_simple_perror_msg(mount_point);
 113                         goto SET_ERROR;
 114                 }
 115
 116                 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
 117                         if (opt & OPT_INODE) {
 118                                 s.f_blocks = s.f_files;
 119                                 s.f_bavail = s.f_bfree = s.f_ffree;
 120                                 s.f_bsize = 1;
 121 #if ENABLE_FEATURE_HUMAN_READABLE
 122                                 if (df_disp_hr)
 123                                         df_disp_hr = 1;
 124 #endif
 125                         }
 126                         blocks_used = s.f_blocks - s.f_bfree;
 127                         blocks_percent_used = 0;
 128                         if (blocks_used + s.f_bavail) {
 129                                 blocks_percent_used = (blocks_used * 100ULL
 130                                                 + (blocks_used + s.f_bavail)/2
 131                                                 ) / (blocks_used + s.f_bavail);
 132                         }
 133
 134 #ifdef WHY_IT_SHOULD_BE_HIDDEN
 135                         if (strcmp(device, "rootfs") == 0) {
 136                                 continue;
 137                         }
 138 #endif
 139 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
 140 /* ... and also this is the only user of find_block_device */
 141                         if (strcmp(device, "/dev/root") == 0) {
 142                                 /* Adjusts device to be the real root device,
 143                                 * or leaves device alone if it can't find it */
 144                                 device = find_block_device("/");
 145                                 if (!device) {
 146                                         goto SET_ERROR;
 147                                 }
 148                         }
 149 #endif
 150
 151                         if (printf("\n%-20s" + 1, device) > 20)
 152                                     printf("\n%-20s", "");
 153 #if ENABLE_FEATURE_HUMAN_READABLE
 154                         printf(" %9s ",
 155                                 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
 156
 157                         printf(" %9s " + 1,
 158                                 make_human_readable_str((s.f_blocks - s.f_bfree),
 159                                                 s.f_bsize, df_disp_hr));
 160
 161                         printf("%9s %3u%% %s\n",
 162                                         make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
 163                                         blocks_percent_used, mount_point);
 164 #else
 165                         printf(" %9lu %9lu %9lu %3u%% %s\n",
 166                                         kscale(s.f_blocks, s.f_bsize),
 167                                         kscale(s.f_blocks-s.f_bfree, s.f_bsize),
 168                                         kscale(s.f_bavail, s.f_bsize),
 169                                         blocks_percent_used, mount_point);
 170 #endif
 171                 }
 172         }
 173
 174         fflush_stdout_and_exit(status);
 175 }