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/* vi: set sw=4 ts=4: */
/*
* Mini df implementation for busybox
*
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
* based on original code by (I think) Bruce Perens <bruce@pixar.com>.
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* Size reduction. Removed floating point dependency. Added error checking
* on output. Output stats on 0-sized filesystems if specifically listed on
* the command line. Properly round *-blocks, Used, and Available quantities.
*
* Aug 28, 2008 Bernhard Reutner-Fischer
*
* Implement -P and -B; better coreutils compat; cleanup
*/
#include <mntent.h>
#include <sys/vfs.h>
#include "libbb.h"
#if !ENABLE_FEATURE_HUMAN_READABLE
static unsigned long kscale(unsigned long b, unsigned long bs)
{
return (b * (unsigned long long) bs + 1024/2) / 1024;
}
#endif
int df_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int df_main(int argc, char **argv)
{
unsigned long blocks_used;
unsigned blocks_percent_used;
unsigned long df_disp_hr = 1024;
int status = EXIT_SUCCESS;
unsigned opt;
FILE *mount_table;
struct mntent *mount_entry;
struct statfs s;
enum {
OPT_KILO = (1 << 0),
OPT_POSIX = (1 << 1),
OPT_ALL = (1 << 2) * ENABLE_FEATURE_DF_FANCY,
OPT_INODE = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
OPT_BSIZE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
OPT_HUMAN = (1 << (2 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
OPT_MEGA = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
};
const char *disp_units_hdr = NULL;
char *chp;
#if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
opt_complementary = "k-mB:m-Bk:B-km";
#elif ENABLE_FEATURE_HUMAN_READABLE
opt_complementary = "k-m:m-k";
#endif
opt = getopt32(argv, "kP"
IF_FEATURE_DF_FANCY("aiB:")
IF_FEATURE_HUMAN_READABLE("hm")
IF_FEATURE_DF_FANCY(, &chp));
if (opt & OPT_MEGA)
df_disp_hr = 1024*1024;
if (opt & OPT_BSIZE)
df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
/* From the manpage of df from coreutils-6.10:
Disk space is shown in 1K blocks by default, unless the environment
variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
*/
if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
df_disp_hr = 512;
if (opt & OPT_HUMAN) {
df_disp_hr = 0;
disp_units_hdr = " Size";
}
if (opt & OPT_INODE)
disp_units_hdr = " Inodes";
if (disp_units_hdr == NULL) {
#if ENABLE_FEATURE_HUMAN_READABLE
disp_units_hdr = xasprintf("%s-blocks",
make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX)));
#else
disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
#endif
}
printf("Filesystem %-15sUsed Available %s Mounted on\n",
disp_units_hdr, (opt & OPT_POSIX) ? "Capacity" : "Use%");
mount_table = NULL;
argv += optind;
if (optind >= argc) {
mount_table = setmntent(bb_path_mtab_file, "r");
if (!mount_table)
bb_perror_msg_and_die(bb_path_mtab_file);
}
while (1) {
const char *device;
const char *mount_point;
if (mount_table) {
mount_entry = getmntent(mount_table);
if (!mount_entry) {
endmntent(mount_table);
break;
}
} else {
mount_point = *argv++;
if (!mount_point)
break;
mount_entry = find_mount_point(mount_point);
if (!mount_entry) {
bb_error_msg("%s: can't find mount point", mount_point);
set_error:
status = EXIT_FAILURE;
continue;
}
}
device = mount_entry->mnt_fsname;
mount_point = mount_entry->mnt_dir;
if (statfs(mount_point, &s) != 0) {
bb_simple_perror_msg(mount_point);
goto set_error;
}
if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
if (opt & OPT_INODE) {
s.f_blocks = s.f_files;
s.f_bavail = s.f_bfree = s.f_ffree;
s.f_bsize = 1;
if (df_disp_hr)
df_disp_hr = 1;
}
blocks_used = s.f_blocks - s.f_bfree;
blocks_percent_used = 0;
if (blocks_used + s.f_bavail) {
blocks_percent_used = (blocks_used * 100ULL
+ (blocks_used + s.f_bavail)/2
) / (blocks_used + s.f_bavail);
}
/* GNU coreutils 6.10 skips certain mounts, try to be compatible. */
if (strcmp(device, "rootfs") == 0)
continue;
#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
/* ... and also this is the only user of find_block_device */
if (strcmp(device, "/dev/root") == 0) {
/* Adjusts device to be the real root device,
* or leaves device alone if it can't find it */
device = find_block_device("/");
if (!device) {
goto set_error;
}
}
#endif
if (printf("\n%-20s" + 1, device) > 20)
printf("\n%-20s", "");
#if ENABLE_FEATURE_HUMAN_READABLE
printf(" %9s ",
make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
printf(" %9s " + 1,
make_human_readable_str((s.f_blocks - s.f_bfree),
s.f_bsize, df_disp_hr));
printf("%9s %3u%% %s\n",
make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
blocks_percent_used, mount_point);
#else
printf(" %9lu %9lu %9lu %3u%% %s\n",
kscale(s.f_blocks, s.f_bsize),
kscale(s.f_blocks - s.f_bfree, s.f_bsize),
kscale(s.f_bavail, s.f_bsize),
blocks_percent_used, mount_point);
#endif
}
}
return status;
}
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