hush/coreutils/du.c
Bernhard Reutner-Fischer 73561cc75a - pull from busybox_scratch: r15829:15850
Various fixes, cleanups and shrinkage:
saves 952 Bytes:
   text    data     bss     dec     hex filename
1087742   15853  790632 1894227  1ce753 ../busybox/busybox.old
1086790   15853  790632 1893275  1ce39b busybox
via:
# scripts/bloat-o-meter ../busybox/busybox_unstripped.old busybox_unstripped 
function                                             old     new   delta
ipcrm_main                                           756     822     +66
getval                                                 -      61     +61
maybe_set_utc                                          -      40     +40
udhcpc_main                                         2896    2912     +16
md5_hash_block                                       428     437      +9
opt                                                    8      16      +8
qgravechar                                           106     110      +4
make_bitmap                                          292     295      +3
inflate_unzip                                       2056    2059      +3
add_partition                                       1412    1414      +2
__parsespent                                         156     158      +2
qrealloc                                              41      42      +1
format                                                 -       1      +1
catv_main                                            313     314      +1
watch_main                                           293     292      -1
varunset                                              81      80      -1
part                                                   1       -      -1
check_if_skip                                        837     836      -1
start_stop_daemon_main                               840     837      -3
create_lost_and_found                                175     172      -3
supress_non_delimited_lines                            4       -      -4
static.l                                               4       -      -4
static.c                                               5       1      -4
bsd_sum_file                                         237     233      -4
eval2                                                338     332      -6
arithmetic_common                                    166     158      -8
cmpfunc                                               22       5     -17
cksum_main                                           294     275     -19
cmp_main                                             465     439     -26
dd_main                                             1535    1508     -27
rmmod_main                                           376     333     -43
cut_file                                             727     644     -83
ipcs_main                                           3809    3721     -88
cut_main                                             722     614    -108
date_main                                           1443    1263    -180
remove_ids                                           222       -    -222
------------------------------------------------------------------------------
(add/remove: 3/4 grow/shrink: 11/18 up/down: 217/-853)       Total: -636 bytes
2006-08-28 23:31:54 +00:00

251 lines
5.7 KiB
C

/* vi: set sw=4 ts=4: */
/*
* Mini du implementation for busybox
*
* Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu
* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
* Copyright (C) 2002 Edward Betts <edward@debian.org>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
/* BB_AUDIT SUSv3 compliant (unless default blocksize set to 1k) */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/du.html */
/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
* Mostly rewritten for SUSv3 compliance and to fix bugs/defects.
* 1) Added support for SUSv3 -a, -H, -L, gnu -c, and (busybox) -d options.
* The -d option allows setting of max depth (similar to gnu --max-depth).
* 2) Fixed incorrect size calculations for links and directories, especially
* when errors occurred. Calculates sizes should now match gnu du output.
* 3) Added error checking of output.
* 4) Fixed busybox bug #1284 involving long overflow with human_readable.
*/
#include "busybox.h"
#ifdef CONFIG_FEATURE_HUMAN_READABLE
# ifdef CONFIG_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
static unsigned long disp_hr = KILOBYTE;
# else
static unsigned long disp_hr = 512;
# endif
#elif defined CONFIG_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
static unsigned int disp_k = 1;
#else
static unsigned int disp_k; /* bss inits to 0 */
#endif
static int max_print_depth = INT_MAX;
static nlink_t count_hardlinks = 1;
static int status
#if EXIT_SUCCESS == 0
= EXIT_SUCCESS
#endif
;
static int print_files;
static int slink_depth;
static int du_depth;
static int one_file_system;
static dev_t dir_dev;
static void print(long size, const char * const filename)
{
/* TODO - May not want to defer error checking here. */
#ifdef CONFIG_FEATURE_HUMAN_READABLE
bb_printf("%s\t%s\n", make_human_readable_str(size, 512, disp_hr),
filename);
#else
if (disp_k) {
size++;
size >>= 1;
}
bb_printf("%ld\t%s\n", size, filename);
#endif
}
/* tiny recursive du */
static long du(const char * const filename)
{
struct stat statbuf;
long sum;
if ((lstat(filename, &statbuf)) != 0) {
bb_perror_msg("%s", filename);
status = EXIT_FAILURE;
return 0;
}
if (one_file_system) {
if (du_depth == 0) {
dir_dev = statbuf.st_dev;
} else if (dir_dev != statbuf.st_dev) {
return 0;
}
}
sum = statbuf.st_blocks;
if (S_ISLNK(statbuf.st_mode)) {
if (slink_depth > du_depth) { /* -H or -L */
if ((stat(filename, &statbuf)) != 0) {
bb_perror_msg("%s", filename);
status = EXIT_FAILURE;
return 0;
}
sum = statbuf.st_blocks;
if (slink_depth == 1) {
slink_depth = INT_MAX; /* Convert -H to -L. */
}
}
}
if (statbuf.st_nlink > count_hardlinks) {
/* Add files/directories with links only once */
if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
return 0;
}
add_to_ino_dev_hashtable(&statbuf, NULL);
}
if (S_ISDIR(statbuf.st_mode)) {
DIR *dir;
struct dirent *entry;
char *newfile;
dir = warn_opendir(filename);
if (!dir) {
status = EXIT_FAILURE;
return sum;
}
newfile = last_char_is(filename, '/');
if (newfile)
*newfile = '\0';
while ((entry = readdir(dir))) {
char *name = entry->d_name;
newfile = concat_subpath_file(filename, name);
if(newfile == NULL)
continue;
++du_depth;
sum += du(newfile);
--du_depth;
free(newfile);
}
closedir(dir);
} else if (du_depth > print_files) {
return sum;
}
if (du_depth <= max_print_depth) {
print(sum, filename);
}
return sum;
}
int du_main(int argc, char **argv)
{
long total;
int slink_depth_save;
int print_final_total;
char *smax_print_depth;
unsigned long opt;
#ifdef CONFIG_FEATURE_DU_DEFUALT_BLOCKSIZE_1K
if (getenv("POSIXLY_CORRECT")) { /* TODO - a new libbb function? */
#ifdef CONFIG_FEATURE_HUMAN_READABLE
disp_hr = 512;
#else
disp_k = 0;
#endif
}
#endif
/* Note: SUSv3 specifies that -a and -s options can not be used together
* in strictly conforming applications. However, it also says that some
* du implementations may produce output when -a and -s are used together.
* gnu du exits with an error code in this case. We choose to simply
* ignore -a. This is consistent with -s being equivalent to -d 0.
*/
#ifdef CONFIG_FEATURE_HUMAN_READABLE
bb_opt_complementally = "h-km:k-hm:m-hk:H-L:L-H:s-d:d-s";
opt = bb_getopt_ulflags(argc, argv, "aHkLsx" "d:" "lc" "hm", &smax_print_depth);
if((opt & (1 << 9))) {
/* -h opt */
disp_hr = 0;
}
if((opt & (1 << 10))) {
/* -m opt */
disp_hr = MEGABYTE;
}
if((opt & (1 << 2))) {
/* -k opt */
disp_hr = KILOBYTE;
}
#else
bb_opt_complementally = "H-L:L-H:s-d:d-s";
opt = bb_getopt_ulflags(argc, argv, "aHkLsx" "d:" "lc", &smax_print_depth);
#if !defined CONFIG_FEATURE_DU_DEFAULT_BLOCKSIZE_1K
if((opt & (1 << 2))) {
/* -k opt */
disp_k = 1;
}
#endif
#endif
if((opt & (1 << 0))) {
/* -a opt */
print_files = INT_MAX;
}
if((opt & (1 << 1))) {
/* -H opt */
slink_depth = 1;
}
if((opt & (1 << 3))) {
/* -L opt */
slink_depth = INT_MAX;
}
if((opt & (1 << 4))) {
/* -s opt */
max_print_depth = 0;
}
one_file_system = opt & (1 << 5); /* -x opt */
if((opt & (1 << 6))) {
/* -d opt */
max_print_depth = bb_xgetularg10_bnd(smax_print_depth, 0, INT_MAX);
}
if((opt & (1 << 7))) {
/* -l opt */
count_hardlinks = INT_MAX;
}
print_final_total = opt & (1 << 8); /* -c opt */
/* go through remaining args (if any) */
argv += optind;
if (optind >= argc) {
*--argv = ".";
if (slink_depth == 1) {
slink_depth = 0;
}
}
slink_depth_save = slink_depth;
total = 0;
do {
total += du(*argv);
slink_depth = slink_depth_save;
} while (*++argv);
#ifdef CONFIG_FEATURE_CLEAN_UP
reset_ino_dev_hashtable();
#endif
if (print_final_total) {
print(total, "total");
}
bb_fflush_stdout_and_exit(status);
}