busybox/coreutils/df.c
Denys Vlasenko a2a9113f35 df: POSIXLY_CORRECT sets _default_ scale, -m/-h overrides it
function                                             old     new   delta
df_main                                             1034    1029      -5

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2021-06-20 14:46:19 +02:00

321 lines
9.4 KiB
C

/* 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 source tree.
*/
/* 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
*/
//config:config DF
//config: bool "df (6.8 kb)"
//config: default y
//config: help
//config: df reports the amount of disk space used and available
//config: on filesystems.
//config:
//config:config FEATURE_DF_FANCY
//config: bool "Enable -a, -i, -B"
//config: default y
//config: depends on DF
//config: help
//config: -a Show all filesystems
//config: -i Inodes
//config: -B <SIZE> Blocksize
//applet:IF_DF(APPLET_NOEXEC(df, df, BB_DIR_BIN, BB_SUID_DROP, df))
//kbuild:lib-$(CONFIG_DF) += df.o
/* BB_AUDIT SUSv3 _NOT_ compliant -- option -t missing. */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
//usage:#define df_trivial_usage
//usage: "[-Pk"
//usage: IF_FEATURE_HUMAN_READABLE("mh")
//usage: "T"
//usage: IF_FEATURE_DF_FANCY("ai] [-B SIZE")
//usage: "] [FILESYSTEM]..."
//usage:#define df_full_usage "\n\n"
//usage: "Print filesystem usage statistics\n"
//usage: "\n -P POSIX output format"
//usage: "\n -k 1024-byte blocks (default)"
//usage: IF_FEATURE_HUMAN_READABLE(
//usage: "\n -m 1M-byte blocks"
//usage: "\n -h Human readable (e.g. 1K 243M 2G)"
//usage: )
//usage: "\n -T Print filesystem type"
//usage: IF_FEATURE_DF_FANCY(
//usage: "\n -a Show all filesystems"
//usage: "\n -i Inodes"
//usage: "\n -B SIZE Blocksize"
//usage: )
//usage:
//usage:#define df_example_usage
//usage: "$ df\n"
//usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
//usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
//usage: "/dev/sda1 64216 36364 27852 57% /boot\n"
//usage: "$ df /dev/sda3\n"
//usage: "Filesystem 1K-blocks Used Available Use% Mounted on\n"
//usage: "/dev/sda3 8690864 8553540 137324 98% /\n"
//usage: "$ POSIXLY_CORRECT=sure df /dev/sda3\n"
//usage: "Filesystem 512B-blocks Used Available Use% Mounted on\n"
//usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
//usage: "$ POSIXLY_CORRECT=yep df -P /dev/sda3\n"
//usage: "Filesystem 512-blocks Used Available Capacity Mounted on\n"
//usage: "/dev/sda3 17381728 17107080 274648 98% /\n"
#include <mntent.h>
#include <sys/statvfs.h>
#include "libbb.h"
#include "unicode.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 UNUSED_PARAM, char **argv)
{
unsigned long df_disp_hr = 1024;
int status = EXIT_SUCCESS;
unsigned opt;
FILE *mount_table;
struct mntent *mount_entry;
struct statvfs s;
enum {
OPT_KILO = (1 << 0),
OPT_POSIX = (1 << 1),
OPT_FSTYPE = (1 << 2),
OPT_ALL = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
OPT_INODE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
OPT_BSIZE = (1 << 5) * ENABLE_FEATURE_DF_FANCY,
OPT_HUMAN = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
OPT_MEGA = (1 << (4 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
};
const char *disp_units_hdr = NULL;
char *chp;
init_unicode();
/* 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;
opt = getopt32(argv, "^"
"kPT"
IF_FEATURE_DF_FANCY("aiB:")
IF_FEATURE_HUMAN_READABLE("hm")
"\0"
#if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
"k-mB:m-Bk:B-km"
#elif ENABLE_FEATURE_HUMAN_READABLE
"k-m:m-k"
#endif
IF_FEATURE_DF_FANCY(, &chp)
);
if (opt & OPT_MEGA)
df_disp_hr = 1024*1024;
if (opt & OPT_BSIZE) {
/* GNU coreutils 8.25 accepts "-BMiB" form too */
int i;
for (i = 0; kmg_i_suffixes[i].suffix[0]; i++) {
if (strcmp(kmg_i_suffixes[i].suffix, chp) == 0) {
df_disp_hr = kmg_i_suffixes[i].mult;
goto got_it;
}
}
/* Range used to disallow 0 */
df_disp_hr = xatoul_range_sfx(chp, 1, ULONG_MAX, kmg_i_suffixes);
got_it: ;
}
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",
/* print df_disp_hr, show no fractionals,
* use suffixes if OPT_POSIX is set in opt */
make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))
);
#else
disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
#endif
}
printf("Filesystem %s%-15sUsed Available %s Mounted on\n",
(opt & OPT_FSTYPE) ? "Type " : "",
disp_units_hdr,
(opt & OPT_POSIX) ? "Capacity" : "Use%");
mount_table = NULL;
argv += optind;
if (!argv[0]) {
mount_table = setmntent(bb_path_mtab_file, "r");
if (!mount_table)
bb_simple_perror_msg_and_die(bb_path_mtab_file);
}
while (1) {
const char *device;
const char *mount_point;
const char *fs_type;
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, 1);
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;
/* GNU coreutils 6.10 skips certain mounts, try to be compatible */
if (ENABLE_FEATURE_SKIP_ROOTFS && strcmp(device, "rootfs") == 0)
continue;
mount_point = mount_entry->mnt_dir;
fs_type = mount_entry->mnt_type;
if (statvfs(mount_point, &s) != 0) {
bb_simple_perror_msg(mount_point);
goto set_error;
}
/* Some uclibc versions were seen to lose f_frsize
* (kernel does return it, but then uclibc does not copy it)
*/
if (s.f_frsize == 0)
s.f_frsize = s.f_bsize;
if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
unsigned long long blocks_used;
unsigned long long blocks_total;
unsigned blocks_percent_used;
if (opt & OPT_INODE) {
s.f_blocks = s.f_files;
s.f_bavail = s.f_bfree = s.f_ffree;
s.f_frsize = 1;
if (df_disp_hr)
df_disp_hr = 1;
}
blocks_used = s.f_blocks - s.f_bfree;
blocks_total = blocks_used + s.f_bavail;
blocks_percent_used = blocks_total; /* 0% if blocks_total == 0, else... */
if (blocks_total != 0) {
/* Downscale sizes for narrower division */
unsigned u;
while (blocks_total >= INT_MAX / 101) {
blocks_total >>= 1;
blocks_used >>= 1;
}
u = (unsigned)blocks_used * 100u + (unsigned)blocks_total / 2;
blocks_percent_used = u / (unsigned)blocks_total;
}
#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
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 ENABLE_UNICODE_SUPPORT
{
uni_stat_t uni_stat;
char *uni_dev = unicode_conv_to_printable(&uni_stat, device);
if (uni_stat.unicode_width > 20 && !(opt & OPT_POSIX)) {
printf("%s\n%20s", uni_dev, "");
} else {
printf("%s%*s", uni_dev, 20 - (int)uni_stat.unicode_width, "");
}
free(uni_dev);
if (opt & OPT_FSTYPE) {
char *uni_type = unicode_conv_to_printable(&uni_stat, fs_type);
if (uni_stat.unicode_width > 10 && !(opt & OPT_POSIX))
printf(" %s\n%31s", uni_type, "");
else
printf(" %s%*s", uni_type, 10 - (int)uni_stat.unicode_width, "");
free(uni_type);
}
}
#else
if (printf("\n%-20s" + 1, device) > 20 && !(opt & OPT_POSIX))
printf("\n%-20s", "");
if (opt & OPT_FSTYPE) {
if (printf(" %-10s", fs_type) > 11 && !(opt & OPT_POSIX))
printf("\n%-30s", "");
}
#endif
#if ENABLE_FEATURE_HUMAN_READABLE
printf(" %9s ",
/* f_blocks x f_frsize / df_disp_hr, show one fractional,
* use suffixes if df_disp_hr == 0 */
make_human_readable_str(s.f_blocks, s.f_frsize, df_disp_hr));
printf(" %9s " + 1,
/* EXPR x f_frsize / df_disp_hr, show one fractional,
* use suffixes if df_disp_hr == 0 */
make_human_readable_str((s.f_blocks - s.f_bfree),
s.f_frsize, df_disp_hr));
printf("%9s %3u%% %s\n",
/* f_bavail x f_frsize / df_disp_hr, show one fractional,
* use suffixes if df_disp_hr == 0 */
make_human_readable_str(s.f_bavail, s.f_frsize, df_disp_hr),
blocks_percent_used, mount_point);
#else
printf(" %9lu %9lu %9lu %3u%% %s\n",
kscale(s.f_blocks, s.f_frsize),
kscale(s.f_blocks - s.f_bfree, s.f_frsize),
kscale(s.f_bavail, s.f_frsize),
blocks_percent_used, mount_point);
#endif
}
}
return status;
}