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/* vi: set sw=4 ts=4: */
/*
* Mini df implementation for busybox
*
* Copyright (C) 1999,2000 by Lineo, inc. and Erik Andersen
* Copyright (C) 1999,2000,2001 by Erik Andersen <andersee@debian.org>
* based on original code by (I think) Bruce Perens <bruce@pixar.com>.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing. Also blocksize. */
/* 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 specificly listed on
* the command line. Properly round *-blocks, Used, and Available quantities.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <mntent.h>
#include <sys/vfs.h>
#include "busybox.h"
#ifndef CONFIG_FEATURE_HUMAN_READABLE
static long kscale(long b, long bs)
{
return ( b * (long long) bs + KILOBYTE/2 ) / KILOBYTE;
}
#endif
extern int df_main(int argc, char **argv)
{
long blocks_used;
long blocks_percent_used;
#ifdef CONFIG_FEATURE_HUMAN_READABLE
unsigned long df_disp_hr = KILOBYTE;
#endif
int status = EXIT_SUCCESS;
int opt;
FILE *mount_table;
struct mntent *mount_entry;
struct statfs s;
static const char hdr_1k[] = "1k-blocks"; /* default display is kilobytes */;
const char *disp_units_hdr = hdr_1k;
while ((opt = getopt(argc, argv, "k"
#ifdef CONFIG_FEATURE_HUMAN_READABLE
"hm"
#endif
)) > 0)
{
switch (opt) {
#ifdef CONFIG_FEATURE_HUMAN_READABLE
case 'h':
df_disp_hr = 0;
disp_units_hdr = " Size";
break;
case 'm':
df_disp_hr = MEGABYTE;
disp_units_hdr = "1M-blocks";
break;
#endif
case 'k':
/* default display is kilobytes */
#ifdef CONFIG_FEATURE_HUMAN_READABLE
df_disp_hr = KILOBYTE;
disp_units_hdr = hdr_1k;
#endif
break;
default:
bb_show_usage();
}
}
bb_printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
"", disp_units_hdr);
mount_table = NULL;
argv += optind;
if (optind >= argc) {
if (!(mount_table = setmntent(bb_path_mtab_file, "r"))) {
bb_perror_msg_and_die(bb_path_mtab_file);
}
}
do {
const char *device;
const char *mount_point;
if (mount_table) {
if (!(mount_entry = getmntent(mount_table))) {
endmntent(mount_table);
break;
}
} else {
if (!(mount_point = *argv++)) {
break;
}
if (!(mount_entry = find_mount_point(mount_point, bb_path_mtab_file))) {
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_perror_msg("%s", mount_point);
goto SET_ERROR;
}
if ((s.f_blocks > 0) || !mount_table){
blocks_used = s.f_blocks - s.f_bfree;
blocks_percent_used = 0;
if (blocks_used + s.f_bavail) {
blocks_percent_used = (((long long) blocks_used) * 100
+ (blocks_used + s.f_bavail)/2
) / (blocks_used + s.f_bavail);
}
if (strcmp(device, "/dev/root") == 0) {
/* Adjusts device to be the real root device,
* or leaves device alone if it can't find it */
if ((device = find_real_root_device_name(device)) != NULL) {
goto SET_ERROR;
}
}
#ifdef CONFIG_FEATURE_HUMAN_READABLE
bb_printf("%-21s%9s ", device,
make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
bb_printf("%9s ",
make_human_readable_str( (s.f_blocks - s.f_bfree),
s.f_bsize, df_disp_hr));
bb_printf("%9s %3ld%% %s\n",
make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
blocks_percent_used, mount_point);
#else
bb_printf("%-21s%9ld %9ld %9ld %3ld%% %s\n",
device,
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
}
} while (1);
bb_fflush_stdout_and_exit(status);
}
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
|
