diff options
Diffstat (limited to 'coreutils/df.c')
| -rw-r--r-- | coreutils/df.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/coreutils/df.c b/coreutils/df.c new file mode 100644 index 0000000..1c7d6cb --- /dev/null +++ b/coreutils/df.c @@ -0,0 +1,198 @@ +/* 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 -- option -t missing. */ +/* 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. + * + * Aug 28, 2008 Bernhard Reutner-Fischer + * + * Implement -P and -B; better coreutils compat; cleanup + */ + +#include <mntent.h> +#include <sys/vfs.h> +#include "libbb.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, char **argv) +{ + unsigned long blocks_used; + unsigned blocks_percent_used; + unsigned long df_disp_hr = 1024; + int status = EXIT_SUCCESS; + unsigned opt; + FILE *mount_table; + struct mntent *mount_entry; + struct statfs s; + static const char ignored_mounts[] ALIGN1 = + "rootfs\0"; + + enum { + OPT_KILO = (1 << 0), + OPT_POSIX = (1 << 1), + OPT_ALL = (1 << 2) * ENABLE_FEATURE_DF_FANCY, + OPT_INODE = (1 << 3) * ENABLE_FEATURE_DF_FANCY, + OPT_BSIZE = (1 << 4) * ENABLE_FEATURE_DF_FANCY, + OPT_HUMAN = (1 << 5) * ENABLE_FEATURE_HUMAN_READABLE, + OPT_MEGA = (1 << 6) * ENABLE_FEATURE_HUMAN_READABLE, + }; + const char *disp_units_hdr = NULL; + char *chp; + +#if ENABLE_FEATURE_HUMAN_READABLE && ENABLE_FEATURE_DF_FANCY + opt_complementary = "k-mB:m-Bk:B-km"; +#elif ENABLE_FEATURE_HUMAN_READABLE + opt_complementary = "k-m:m-k"; +#endif + opt = getopt32(argv, "kP" + USE_FEATURE_DF_FANCY("aiB:") + USE_FEATURE_HUMAN_READABLE("hm") + USE_FEATURE_DF_FANCY(, &chp)); + if (opt & OPT_MEGA) + df_disp_hr = 1024*1024; + + if (opt & OPT_BSIZE) + df_disp_hr = xatoul_range(chp, 1, ULONG_MAX); /* disallow 0 */ + + /* 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; + + 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", + make_human_readable_str(df_disp_hr, 0, !!(opt & OPT_POSIX))); +#else + disp_units_hdr = xasprintf("%lu-blocks", df_disp_hr); +#endif + } + printf("Filesystem %-15sUsed Available %s Mounted on\n", + disp_units_hdr, (opt & OPT_POSIX) ? "Capacity" : "Use%"); + + 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); + } + + while (1) { + 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_simple_perror_msg(mount_point); + goto SET_ERROR; + } + + if ((s.f_blocks > 0) || !mount_table || (opt & OPT_ALL)) { + if (opt & OPT_INODE) { + s.f_blocks = s.f_files; + s.f_bavail = s.f_bfree = s.f_ffree; + s.f_bsize = 1; + + if (df_disp_hr) + df_disp_hr = 1; + } + blocks_used = s.f_blocks - s.f_bfree; + blocks_percent_used = 0; + if (blocks_used + s.f_bavail) { + blocks_percent_used = (blocks_used * 100ULL + + (blocks_used + s.f_bavail)/2 + ) / (blocks_used + s.f_bavail); + } + + /* GNU coreutils 6.10 skip certain mounts, try to be compatible. */ + if (index_in_strings(device, ignored_mounts) != -1) + continue; + +#ifdef WHY_WE_DO_IT_FOR_DEV_ROOT_ONLY +/* ... and also this is the only user of find_block_device */ + 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 (printf("\n%-20s" + 1, device) > 20) + printf("\n%-20s", ""); +#if ENABLE_FEATURE_HUMAN_READABLE + printf(" %9s ", + make_human_readable_str(s.f_blocks, s.f_bsize, df_disp_hr)); + + printf(" %9s " + 1, + make_human_readable_str((s.f_blocks - s.f_bfree), + s.f_bsize, df_disp_hr)); + + printf("%9s %3u%% %s\n", + make_human_readable_str(s.f_bavail, s.f_bsize, df_disp_hr), + blocks_percent_used, mount_point); +#else + printf(" %9lu %9lu %9lu %3u%% %s\n", + 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 + } + } + + return status; +} |