Show du.c syntax highlighted
/* vi: set sw=4 ts=4: */
/*
* Mini du implementation for busybox
*
*
* Copyright (C) 1999,2000,2001 by Lineo, inc.
* Written by John Beppu <beppu@lineo.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <sys/types.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include <errno.h>
#include "busybox.h"
#ifdef BB_FEATURE_HUMAN_READABLE
static unsigned long disp_hr = KILOBYTE;
#endif
typedef void (Display) (long, char *);
static int du_depth = 0;
static int count_hardlinks = 0;
static Display *print;
static void print_normal(long size, char *filename)
{
#ifdef BB_FEATURE_HUMAN_READABLE
printf("%s\t%s\n", make_human_readable_str(size<<10, 1, disp_hr), filename);
#else
printf("%ld\t%s\n", size, filename);
#endif
}
static void print_summary(long size, char *filename)
{
if (du_depth == 1) {
print_normal(size, filename);
}
}
#define HASH_SIZE 311 /* Should be prime */
#define hash_inode(i) ((i) % HASH_SIZE)
typedef struct ino_dev_hash_bucket_struct {
struct ino_dev_hash_bucket_struct *next;
ino_t ino;
dev_t dev;
char name[1];
} ino_dev_hashtable_bucket_t;
static ino_dev_hashtable_bucket_t *ino_dev_hashtable[HASH_SIZE];
/*
* Return 1 if statbuf->st_ino && statbuf->st_dev are recorded in
* `ino_dev_hashtable', else return 0
*
* If NAME is a non-NULL pointer to a character pointer, and there is
* a match, then set *NAME to the value of the name slot in that
* bucket.
*/
static int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name)
{
ino_dev_hashtable_bucket_t *bucket;
bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)];
while (bucket != NULL) {
if ((bucket->ino == statbuf->st_ino) &&
(bucket->dev == statbuf->st_dev))
{
if (name) *name = bucket->name;
return 1;
}
bucket = bucket->next;
}
return 0;
}
/* Add statbuf to statbuf hash table */
static void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name)
{
int i;
size_t s;
ino_dev_hashtable_bucket_t *bucket;
i = hash_inode(statbuf->st_ino);
s = name ? strlen(name) : 0;
bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + s);
bucket->ino = statbuf->st_ino;
bucket->dev = statbuf->st_dev;
if (name)
strcpy(bucket->name, name);
else
bucket->name[0] = '\0';
bucket->next = ino_dev_hashtable[i];
ino_dev_hashtable[i] = bucket;
}
/* Clear statbuf hash table */
static void reset_ino_dev_hashtable(void)
{
int i;
ino_dev_hashtable_bucket_t *bucket;
for (i = 0; i < HASH_SIZE; i++) {
while (ino_dev_hashtable[i] != NULL) {
bucket = ino_dev_hashtable[i]->next;
free(ino_dev_hashtable[i]);
ino_dev_hashtable[i] = bucket;
}
}
}
/* tiny recursive du */
static long du(char *filename)
{
struct stat statbuf;
long sum;
if ((lstat(filename, &statbuf)) != 0) {
perror_msg("%s", filename);
return 0;
}
du_depth++;
sum = (statbuf.st_blocks >> 1);
/* Don't add in stuff pointed to by symbolic links */
if (S_ISLNK(statbuf.st_mode)) {
sum = 0L;
if (du_depth == 1) {
}
}
if (S_ISDIR(statbuf.st_mode)) {
DIR *dir;
struct dirent *entry;
char *newfile;
dir = opendir(filename);
if (!dir) {
du_depth--;
return 0;
}
newfile = last_char_is(filename, '/');
if (newfile)
*newfile = '\0';
while ((entry = readdir(dir))) {
char *name = entry->d_name;
if ((strcmp(name, "..") == 0)
|| (strcmp(name, ".") == 0)) {
continue;
}
newfile = concat_path_file(filename, name);
sum += du(newfile);
free(newfile);
}
closedir(dir);
print(sum, filename);
}
else if (statbuf.st_nlink > 1 && !count_hardlinks) {
/* Add files with hard links only once */
if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
sum = 0L;
if (du_depth == 1)
print(sum, filename);
}
else {
add_to_ino_dev_hashtable(&statbuf, NULL);
}
}
du_depth--;
return sum;
}
int du_main(int argc, char **argv)
{
int status = EXIT_SUCCESS;
int i;
int c;
/* default behaviour */
print = print_normal;
/* parse argv[] */
while ((c = getopt(argc, argv, "sl"
#ifdef BB_FEATURE_HUMAN_READABLE
"hm"
#endif
"k")) != EOF) {
switch (c) {
case 's':
print = print_summary;
break;
case 'l':
count_hardlinks = 1;
break;
#ifdef BB_FEATURE_HUMAN_READABLE
case 'h': disp_hr = 0; break;
case 'm': disp_hr = MEGABYTE; break;
#endif
case 'k': break;
default:
show_usage();
}
}
/* go through remaining args (if any) */
if (optind >= argc) {
if (du(".") == 0)
status = EXIT_FAILURE;
} else {
long sum;
for (i=optind; i < argc; i++) {
sum = du(argv[i]);
if(is_directory(argv[i], FALSE, NULL)==FALSE) {
print_normal(sum, argv[i]);
}
reset_ino_dev_hashtable();
}
}
return status;
}
/* $Id: du.c,v 1.50 2001/06/30 17:54:20 andersen Exp $ */
/*
Local Variables:
c-file-style: "linux"
c-basic-offset: 4
tab-width: 4
End:
*/
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