155 lines
3.8 KiB
C
155 lines
3.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini df implementation for busybox
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*
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* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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* based on original code by (I think) Bruce Perens <bruce@pixar.com>.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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/* BB_AUDIT SUSv3 _NOT_ compliant -- options -P and -t missing. Also blocksize. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/df.html */
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/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
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*
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* Size reduction. Removed floating point dependency. Added error checking
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* on output. Output stats on 0-sized filesystems if specifically listed on
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* the command line. Properly round *-blocks, Used, and Available quantities.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <mntent.h>
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#include <sys/vfs.h>
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#include "busybox.h"
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#ifndef CONFIG_FEATURE_HUMAN_READABLE
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static long kscale(long b, long bs)
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{
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return ( b * (long long) bs + 1024/2 ) / 1024;
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}
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#endif
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int df_main(int argc, char **argv)
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{
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long blocks_used;
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long blocks_percent_used;
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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unsigned long df_disp_hr = 1024;
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#endif
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int status = EXIT_SUCCESS;
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unsigned opt;
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FILE *mount_table;
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struct mntent *mount_entry;
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struct statfs s;
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static const char hdr_1k[] = "1k-blocks"; /* default display is kilobytes */
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const char *disp_units_hdr = hdr_1k;
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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opt_complementary = "h-km:k-hm:m-hk";
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opt = getopt32(argc, argv, "hmk");
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if (opt & 1) {
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df_disp_hr = 0;
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disp_units_hdr = " Size";
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}
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if (opt & 2) {
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df_disp_hr = 1024*1024;
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disp_units_hdr = "1M-blocks";
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}
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#else
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opt = getopt32(argc, argv, "k");
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#endif
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printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n",
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"", disp_units_hdr);
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mount_table = NULL;
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argv += optind;
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if (optind >= argc) {
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mount_table = setmntent(bb_path_mtab_file, "r");
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if (!mount_table) {
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bb_perror_msg_and_die(bb_path_mtab_file);
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}
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}
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do {
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const char *device;
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const char *mount_point;
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if (mount_table) {
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mount_entry = getmntent(mount_table);
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if (!mount_entry) {
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endmntent(mount_table);
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break;
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}
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} else {
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mount_point = *argv++;
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if (!mount_point) {
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break;
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}
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mount_entry = find_mount_point(mount_point, bb_path_mtab_file);
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if (!mount_entry) {
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bb_error_msg("%s: can't find mount point", mount_point);
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SET_ERROR:
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status = EXIT_FAILURE;
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continue;
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}
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}
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device = mount_entry->mnt_fsname;
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mount_point = mount_entry->mnt_dir;
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if (statfs(mount_point, &s) != 0) {
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bb_perror_msg("%s", mount_point);
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goto SET_ERROR;
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}
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if ((s.f_blocks > 0) || !mount_table){
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blocks_used = s.f_blocks - s.f_bfree;
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blocks_percent_used = 0;
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if (blocks_used + s.f_bavail) {
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blocks_percent_used = (((long long) blocks_used) * 100
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+ (blocks_used + s.f_bavail)/2
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) / (blocks_used + s.f_bavail);
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}
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if (strcmp(device, "rootfs") == 0) {
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continue;
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} else if (strcmp(device, "/dev/root") == 0) {
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/* Adjusts device to be the real root device,
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* or leaves device alone if it can't find it */
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device = find_block_device("/");
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if (!device) {
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goto SET_ERROR;
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}
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}
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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printf("%-20s %9s ", device,
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make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
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printf("%9s ",
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make_human_readable_str( (s.f_blocks - s.f_bfree),
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s.f_bsize, df_disp_hr));
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printf("%9s %3ld%% %s\n",
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make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr),
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blocks_percent_used, mount_point);
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#else
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printf("%-20s %9ld %9ld %9ld %3ld%% %s\n",
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device,
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kscale(s.f_blocks, s.f_bsize),
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kscale(s.f_blocks-s.f_bfree, s.f_bsize),
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kscale(s.f_bavail, s.f_bsize),
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blocks_percent_used, mount_point);
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#endif
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}
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} while (1);
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fflush_stdout_and_exit(status);
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}
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