diff options
Diffstat (limited to 'coreutils/df.c')
| -rw-r--r-- | coreutils/df.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/coreutils/df.c b/coreutils/df.c new file mode 100644 index 000000000..6ae3eed33 --- /dev/null +++ b/coreutils/df.c @@ -0,0 +1,154 @@ +/* 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 -- 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 specifically 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 + 1024/2 ) / 1024; +} +#endif + +int df_main(int argc, char **argv) +{ + long blocks_used; + long blocks_percent_used; +#ifdef CONFIG_FEATURE_HUMAN_READABLE + unsigned long df_disp_hr = 1024; +#endif + int status = EXIT_SUCCESS; + unsigned 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; + +#ifdef CONFIG_FEATURE_HUMAN_READABLE + opt_complementary = "h-km:k-hm:m-hk"; + opt = getopt32(argc, argv, "hmk"); + if (opt & 1) { + df_disp_hr = 0; + disp_units_hdr = " Size"; + } + if (opt & 2) { + df_disp_hr = 1024*1024; + disp_units_hdr = "1M-blocks"; + } +#else + opt = getopt32(argc, argv, "k"); +#endif + + printf("Filesystem%11s%-15sUsed Available Use%% Mounted on\n", + "", disp_units_hdr); + + 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); + } + } + + do { + 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, bb_path_mtab_file); + 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_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, "rootfs") == 0) { + continue; + } else 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; + } + } + +#ifdef CONFIG_FEATURE_HUMAN_READABLE + printf("%-20s %9s ", device, + make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr)); + + printf("%9s ", + make_human_readable_str( (s.f_blocks - s.f_bfree), + s.f_bsize, df_disp_hr)); + + printf("%9s %3ld%% %s\n", + make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr), + blocks_percent_used, mount_point); +#else + printf("%-20s %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); + + fflush_stdout_and_exit(status); +} |