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    Contents of /trunk/mkinitrd-magellan/busybox/coreutils/df.c

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 6089 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    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 -- option -t missing. */
    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 * Aug 28, 2008 Bernhard Reutner-Fischer
    21 *
    22 * Implement -P and -B; better coreutils compat; cleanup
    23 */
    24
    25 #include <mntent.h>
    26 #include <sys/vfs.h>
    27 #include "libbb.h"
    28 #include "unicode.h"
    29
    30 #if !ENABLE_FEATURE_HUMAN_READABLE
    31 static unsigned long kscale(unsigned long b, unsigned long bs)
    32 {
    33 return (b * (unsigned long long) bs + 1024/2) / 1024;
    34 }
    35 #endif
    36
    37 int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    38 int df_main(int argc UNUSED_PARAM, char **argv)
    39 {
    40 unsigned long blocks_used;
    41 unsigned blocks_percent_used;
    42 unsigned long df_disp_hr = 1024;
    43 int status = EXIT_SUCCESS;
    44 unsigned opt;
    45 FILE *mount_table;
    46 struct mntent *mount_entry;
    47 struct statfs s;
    48
    49 enum {
    50 OPT_KILO = (1 << 0),
    51 OPT_POSIX = (1 << 1),
    52 OPT_ALL = (1 << 2) * ENABLE_FEATURE_DF_FANCY,
    53 OPT_INODE = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
    54 OPT_BSIZE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
    55 OPT_HUMAN = (1 << (2 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
    56 OPT_MEGA = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
    57 };
    58 const char *disp_units_hdr = NULL;
    59 char *chp;
    60
    61 init_unicode();
    62
    63 #if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
    64 opt_complementary = "k-mB:m-Bk:B-km";
    65 #elif ENABLE_FEATURE_HUMAN_READABLE
    66 opt_complementary = "k-m:m-k";
    67 #endif
    68 opt = getopt32(argv, "kP"
    69 IF_FEATURE_DF_FANCY("aiB:")
    70 IF_FEATURE_HUMAN_READABLE("hm")
    71 IF_FEATURE_DF_FANCY(, &chp));
    72 if (opt & OPT_MEGA)
    73 df_disp_hr = 1024*1024;
    74
    75 if (opt & OPT_BSIZE)
    76 df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
    77
    78 /* From the manpage of df from coreutils-6.10:
    79 Disk space is shown in 1K blocks by default, unless the environment
    80 variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
    81 */
    82 if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
    83 df_disp_hr = 512;
    84
    85 if (opt & OPT_HUMAN) {
    86 df_disp_hr = 0;
    87 disp_units_hdr = " Size";
    88 }
    89 if (opt & OPT_INODE)
    90 disp_units_hdr = " Inodes";
    91
    92 if (disp_units_hdr == NULL) {
    93 #if ENABLE_FEATURE_HUMAN_READABLE
    94 disp_units_hdr = xasprintf("%s-blocks",
    95 /* print df_disp_hr, show no fractionals,
    96 * use suffixes if OPT_POSIX is set in opt */
    97 make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
    98 );
    99 #else
    100 disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
    101 #endif
    102 }
    103 printf("Filesystem %-15sUsed Available %s Mounted on\n",
    104 disp_units_hdr, (opt & OPT_POSIX) ? "Capacity" : "Use%");
    105
    106 mount_table = NULL;
    107 argv += optind;
    108 if (!argv[0]) {
    109 mount_table = setmntent(bb_path_mtab_file, "r");
    110 if (!mount_table)
    111 bb_perror_msg_and_die(bb_path_mtab_file);
    112 }
    113
    114 while (1) {
    115 const char *device;
    116 const char *mount_point;
    117 #if ENABLE_FEATURE_ASSUME_UNICODE
    118 size_t dev_len;
    119 #endif
    120
    121 if (mount_table) {
    122 mount_entry = getmntent(mount_table);
    123 if (!mount_entry) {
    124 endmntent(mount_table);
    125 break;
    126 }
    127 } else {
    128 mount_point = *argv++;
    129 if (!mount_point)
    130 break;
    131 mount_entry = find_mount_point(mount_point, 1);
    132 if (!mount_entry) {
    133 bb_error_msg("%s: can't find mount point", mount_point);
    134 set_error:
    135 status = EXIT_FAILURE;
    136 continue;
    137 }
    138 }
    139
    140 device = mount_entry->mnt_fsname;
    141 mount_point = mount_entry->mnt_dir;
    142
    143 if (statfs(mount_point, &s) != 0) {
    144 bb_simple_perror_msg(mount_point);
    145 goto set_error;
    146 }
    147
    148 if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
    149 if (opt & OPT_INODE) {
    150 s.f_blocks = s.f_files;
    151 s.f_bavail = s.f_bfree = s.f_ffree;
    152 s.f_bsize = 1;
    153
    154 if (df_disp_hr)
    155 df_disp_hr = 1;
    156 }
    157 blocks_used = s.f_blocks - s.f_bfree;
    158 blocks_percent_used = 0;
    159 if (blocks_used + s.f_bavail) {
    160 blocks_percent_used = (blocks_used * 100ULL
    161 + (blocks_used + s.f_bavail)/2
    162 ) / (blocks_used + s.f_bavail);
    163 }
    164
    165 /* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
    166 if (strcmp(device, "rootfs") == 0)
    167 continue;
    168
    169 #ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
    170 if (strcmp(device, "/dev/root") == 0) {
    171 /* Adjusts device to be the real root device,
    172 * or leaves device alone if it can't find it */
    173 device = find_block_device("/");
    174 if (!device) {
    175 goto set_error;
    176 }
    177 }
    178 #endif
    179
    180 #if ENABLE_FEATURE_ASSUME_UNICODE
    181 dev_len = unicode_strlen(device);
    182 if (dev_len > 20) {
    183 printf("%s\n%20s", device, "");
    184 } else {
    185 printf("%s%*s", device, 20 - (int)dev_len, "");
    186 }
    187 #else
    188 if (printf("\n%-20s" + 1, device) > 20)
    189 printf("\n%-20s", "");
    190 #endif
    191
    192 #if ENABLE_FEATURE_HUMAN_READABLE
    193 printf(" %9s ",
    194 /* f_blocks x f_bsize / df_disp_hr, show one fractional,
    195 * use suffixes if df_disp_hr == 0 */
    196 make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
    197
    198 printf(" %9s " + 1,
    199 /* EXPR x f_bsize / df_disp_hr, show one fractional,
    200 * use suffixes if df_disp_hr == 0 */
    201 make_human_readable_str((s.f_blocks - s.f_bfree),
    202 s.f_bsize, df_disp_hr));
    203
    204 printf("%9s %3u%% %s\n",
    205 /* f_bavail x f_bsize / df_disp_hr, show one fractional,
    206 * use suffixes if df_disp_hr == 0 */
    207 make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
    208 blocks_percent_used, mount_point);
    209 #else
    210 printf(" %9lu %9lu %9lu %3u%% %s\n",
    211 kscale(s.f_blocks, s.f_bsize),
    212 kscale(s.f_blocks - s.f_bfree, s.f_bsize),
    213 kscale(s.f_bavail, s.f_bsize),
    214 blocks_percent_used, mount_point);
    215 #endif
    216 }
    217 }
    218
    219 return status;
    220 }