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257 lines
5.5 KiB
C
257 lines
5.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini du implementation for busybox
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*
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* Copyright (C) 1999,2000,2001 by Lineo, inc. and John Beppu
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* Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sys/types.h>
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#include <fcntl.h>
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#include <dirent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include <string.h>
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#include <errno.h>
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#include "busybox.h"
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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static unsigned long disp_hr = KILOBYTE;
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#endif
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typedef void (Display) (long, char *);
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static int du_depth = 0;
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static int count_hardlinks = 0;
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static Display *print;
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static void print_normal(long size, char *filename)
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{
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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printf("%s\t%s\n", make_human_readable_str(size<<10, 1, disp_hr), filename);
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#else
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printf("%ld\t%s\n", size, filename);
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#endif
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}
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static void print_summary(long size, char *filename)
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{
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if (du_depth == 1) {
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print_normal(size, filename);
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}
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}
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#define HASH_SIZE 311 /* Should be prime */
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#define hash_inode(i) ((i) % HASH_SIZE)
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typedef struct ino_dev_hash_bucket_struct {
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struct ino_dev_hash_bucket_struct *next;
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ino_t ino;
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dev_t dev;
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char name[1];
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} ino_dev_hashtable_bucket_t;
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static ino_dev_hashtable_bucket_t *ino_dev_hashtable[HASH_SIZE];
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/*
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* Return 1 if statbuf->st_ino && statbuf->st_dev are recorded in
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* `ino_dev_hashtable', else return 0
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*
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* If NAME is a non-NULL pointer to a character pointer, and there is
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* a match, then set *NAME to the value of the name slot in that
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* bucket.
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*/
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static int is_in_ino_dev_hashtable(const struct stat *statbuf, char **name)
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{
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ino_dev_hashtable_bucket_t *bucket;
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bucket = ino_dev_hashtable[hash_inode(statbuf->st_ino)];
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while (bucket != NULL) {
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if ((bucket->ino == statbuf->st_ino) &&
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(bucket->dev == statbuf->st_dev))
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{
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if (name) *name = bucket->name;
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return 1;
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}
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bucket = bucket->next;
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}
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return 0;
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}
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/* Add statbuf to statbuf hash table */
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static void add_to_ino_dev_hashtable(const struct stat *statbuf, const char *name)
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{
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int i;
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size_t s;
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ino_dev_hashtable_bucket_t *bucket;
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i = hash_inode(statbuf->st_ino);
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s = name ? strlen(name) : 0;
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bucket = xmalloc(sizeof(ino_dev_hashtable_bucket_t) + s);
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bucket->ino = statbuf->st_ino;
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bucket->dev = statbuf->st_dev;
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if (name)
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strcpy(bucket->name, name);
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else
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bucket->name[0] = '\0';
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bucket->next = ino_dev_hashtable[i];
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ino_dev_hashtable[i] = bucket;
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}
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/* Clear statbuf hash table */
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static void reset_ino_dev_hashtable(void)
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{
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int i;
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ino_dev_hashtable_bucket_t *bucket;
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for (i = 0; i < HASH_SIZE; i++) {
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while (ino_dev_hashtable[i] != NULL) {
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bucket = ino_dev_hashtable[i]->next;
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free(ino_dev_hashtable[i]);
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ino_dev_hashtable[i] = bucket;
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}
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}
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}
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/* tiny recursive du */
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static long du(char *filename)
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{
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struct stat statbuf;
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long sum;
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if ((lstat(filename, &statbuf)) != 0) {
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perror_msg("%s", filename);
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return 0;
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}
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du_depth++;
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sum = (statbuf.st_blocks >> 1);
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/* Don't add in stuff pointed to by symbolic links */
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if (S_ISLNK(statbuf.st_mode)) {
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sum = 0L;
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if (du_depth == 1) {
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}
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}
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if (S_ISDIR(statbuf.st_mode)) {
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DIR *dir;
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struct dirent *entry;
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char *newfile;
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dir = opendir(filename);
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if (!dir) {
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du_depth--;
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return 0;
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}
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newfile = last_char_is(filename, '/');
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if (newfile)
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*newfile = '\0';
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while ((entry = readdir(dir))) {
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char *name = entry->d_name;
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if ((strcmp(name, "..") == 0)
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|| (strcmp(name, ".") == 0)) {
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continue;
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}
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newfile = concat_path_file(filename, name);
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sum += du(newfile);
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free(newfile);
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}
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closedir(dir);
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print(sum, filename);
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}
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else if (statbuf.st_nlink > 1 && !count_hardlinks) {
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/* Add files with hard links only once */
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if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
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sum = 0L;
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if (du_depth == 1)
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print(sum, filename);
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}
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else {
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add_to_ino_dev_hashtable(&statbuf, NULL);
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}
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}
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du_depth--;
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return sum;
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}
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int du_main(int argc, char **argv)
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{
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int status = EXIT_SUCCESS;
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int i;
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int c;
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/* default behaviour */
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print = print_normal;
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/* parse argv[] */
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while ((c = getopt(argc, argv, "sl"
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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"hm"
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#endif
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"k")) != EOF) {
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switch (c) {
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case 's':
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print = print_summary;
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break;
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case 'l':
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count_hardlinks = 1;
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break;
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#ifdef CONFIG_FEATURE_HUMAN_READABLE
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case 'h': disp_hr = 0; break;
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case 'm': disp_hr = MEGABYTE; break;
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#endif
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case 'k': break;
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default:
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show_usage();
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}
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}
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/* go through remaining args (if any) */
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if (optind >= argc) {
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if (du(".") == 0)
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status = EXIT_FAILURE;
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} else {
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long sum;
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for (i=optind; i < argc; i++) {
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sum = du(argv[i]);
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if(is_directory(argv[i], FALSE, NULL)==FALSE) {
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print_normal(sum, argv[i]);
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}
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reset_ino_dev_hashtable();
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}
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}
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return status;
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}
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/* $Id: du.c,v 1.51 2001/10/24 04:59:27 andersen Exp $ */
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/*
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Local Variables:
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c-file-style: "linux"
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c-basic-offset: 4
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tab-width: 4
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End:
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*/
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