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and SKIP_XXXX to IF_NOT_XXXX - the second one was especially badly named. It was not skipping anything!
198 lines
5.4 KiB
C
198 lines
5.4 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 -- option -t missing. */
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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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* Aug 28, 2008 Bernhard Reutner-Fischer
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*
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* Implement -P and -B; better coreutils compat; cleanup
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*/
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#include <mntent.h>
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#include <sys/vfs.h>
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#include "libbb.h"
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#if !ENABLE_FEATURE_HUMAN_READABLE
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static unsigned long kscale(unsigned long b, unsigned long bs)
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{
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return (b * (unsigned 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) MAIN_EXTERNALLY_VISIBLE;
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int df_main(int argc, char **argv)
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{
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unsigned long blocks_used;
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unsigned blocks_percent_used;
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unsigned long df_disp_hr = 1024;
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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 ignored_mounts[] ALIGN1 = "rootfs\0";
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enum {
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OPT_KILO = (1 << 0),
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OPT_POSIX = (1 << 1),
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OPT_ALL = (1 << 2) * ENABLE_FEATURE_DF_FANCY,
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OPT_INODE = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
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OPT_BSIZE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
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OPT_HUMAN = (1 << (2 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
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OPT_MEGA = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
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};
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const char *disp_units_hdr = NULL;
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char *chp;
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#if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY
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opt_complementary = "k-mB:m-Bk:B-km";
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#elif ENABLE_FEATURE_HUMAN_READABLE
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opt_complementary = "k-m:m-k";
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#endif
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opt = getopt32(argv, "kP"
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IF_FEATURE_DF_FANCY("aiB:")
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IF_FEATURE_HUMAN_READABLE("hm")
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IF_FEATURE_DF_FANCY(, &chp));
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if (opt & OPT_MEGA)
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df_disp_hr = 1024*1024;
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if (opt & OPT_BSIZE)
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df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */
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/* From the manpage of df from coreutils-6.10:
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Disk space is shown in 1K blocks by default, unless the environment
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variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.
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*/
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if (getenv("POSIXLY_CORRECT")) /* TODO - a new libbb function? */
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df_disp_hr = 512;
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if (opt & OPT_HUMAN) {
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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 & OPT_INODE)
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disp_units_hdr = " Inodes";
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if (disp_units_hdr == NULL) {
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#if ENABLE_FEATURE_HUMAN_READABLE
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disp_units_hdr = xasprintf("%s-blocks",
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make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX)));
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#else
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disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr);
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#endif
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}
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printf("Filesystem %-15sUsed Available %s Mounted on\n",
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disp_units_hdr, (opt & OPT_POSIX) ? "Capacity" : "Use%");
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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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while (1) {
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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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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_simple_perror_msg(mount_point);
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goto set_error;
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}
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if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) {
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if (opt & OPT_INODE) {
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s.f_blocks = s.f_files;
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s.f_bavail = s.f_bfree = s.f_ffree;
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s.f_bsize = 1;
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if (df_disp_hr)
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df_disp_hr = 1;
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}
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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 = (blocks_used * 100ULL
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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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/* GNU coreutils 6.10 skip certain mounts, try to be compatible. */
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if (index_in_strings(device, ignored_mounts) != -1)
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continue;
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#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY
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/* ... and also this is the only user of find_block_device */
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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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#endif
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if (printf("\n%-20s" + 1, device) > 20)
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printf("\n%-20s", "");
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#if ENABLE_FEATURE_HUMAN_READABLE
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printf(" %9s ",
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make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr));
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printf(" %9s " + 1,
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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 %3u%% %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(" %9lu %9lu %9lu %3u%% %s\n",
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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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}
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return status;
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}
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