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/* vi: set sw=4 ts=4: */
/*
* Mini du implementation for busybox
*
*
* Copyright (C) 1999 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 "internal.h"
#define BB_DECLARE_EXTERN
#define bb_need_name_too_long
#include "messages.c"
#include <sys/types.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdio.h>
#include <errno.h>
#include <sys/param.h> /* for PATH_MAX */
typedef void (Display) (long, char *);
typedef struct inode_type {
struct inode_type *next;
ino_t ino;
} INODETYPE;
#define HASH_SIZE 311 /* Should be prime */
#define hash_inode(i) ((i) % HASH_SIZE)
static INODETYPE *inode_hash_list[HASH_SIZE];
static const char du_usage[] =
"du [OPTION]... [FILE]...\n\n"
"Summarize disk space used for each FILE and/or directory.\n"
"Disk space is printed in units of 1024 bytes.\n\n"
"Options:\n"
"\t-l\tcount sizes many times if hard linked\n"
"\t-s\tdisplay only a total for each argument\n";
static int du_depth = 0;
static int count_hardlinks = 0;
static Display *print;
static void print_normal(long size, char *filename)
{
fprintf(stdout, "%ld\t%s\n", size, filename);
}
static void print_summary(long size, char *filename)
{
if (du_depth == 1) {
print_normal(size, filename);
}
}
/* Return 1 if inode is in inode hash list, else return 0 */
static int is_in_list(const ino_t ino)
{
INODETYPE *inode;
inode = inode_hash_list[hash_inode(ino)];
while (inode != NULL) {
if (inode->ino == ino)
return 1;
inode = inode->next;
}
return 0;
}
/* Add inode to inode hash list */
static void add_inode(const ino_t ino)
{
int i;
INODETYPE *inode;
i = hash_inode(ino);
inode = malloc(sizeof(INODETYPE));
if (inode == NULL)
fatalError("du: Not enough memory.");
inode->ino = ino;
inode->next = inode_hash_list[i];
inode_hash_list[i] = inode;
}
/* Clear inode hash list */
static void reset_inode_list(void)
{
int i;
INODETYPE *inode;
for (i = 0; i < HASH_SIZE; i++) {
while (inode_hash_list[i] != NULL) {
inode = inode_hash_list[i]->next;
free(inode_hash_list[i]);
inode_hash_list[i] = inode;
}
}
}
/* tiny recursive du */
static long du(char *filename)
{
struct stat statbuf;
long sum;
int len;
if ((lstat(filename, &statbuf)) != 0) {
printf("du: %s: %s\n", filename, strerror(errno));
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)
print(sum, filename);
}
if (S_ISDIR(statbuf.st_mode)) {
DIR *dir;
struct dirent *entry;
dir = opendir(filename);
if (!dir) {
du_depth--;
return 0;
}
len = strlen(filename);
if (filename[len - 1] == '/')
filename[--len] = '\0';
while ((entry = readdir(dir))) {
char newfile[PATH_MAX + 1];
char *name = entry->d_name;
if ((strcmp(name, "..") == 0)
|| (strcmp(name, ".") == 0)) {
continue;
}
if (len + strlen(name) + 1 > PATH_MAX) {
fprintf(stderr, name_too_long, "du");
du_depth--;
return 0;
}
sprintf(newfile, "%s/%s", filename, name);
sum += du(newfile);
}
closedir(dir);
print(sum, filename);
}
else if (statbuf.st_nlink > 1 && !count_hardlinks) {
/* Add files with hard links only once */
if (is_in_list(statbuf.st_ino)) {
sum = 0L;
if (du_depth == 1)
print(sum, filename);
}
else {
add_inode(statbuf.st_ino);
}
}
du_depth--;
return sum;
}
int du_main(int argc, char **argv)
{
int i;
char opt;
/* default behaviour */
print = print_normal;
/* parse argv[] */
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
opt = argv[i][1];
switch (opt) {
case 's':
print = print_summary;
break;
case 'l':
count_hardlinks = 1;
break;
case 'h':
case '-':
usage(du_usage);
break;
default:
fprintf(stderr, "du: invalid option -- %c\n", opt);
usage(du_usage);
}
} else {
break;
}
}
/* go through remaining args (if any) */
if (i >= argc) {
du(".");
} else {
long sum;
for (; i < argc; i++) {
sum = du(argv[i]);
if (sum && isDirectory(argv[i], FALSE, NULL)) {
print_normal(sum, argv[i]);
}
reset_inode_list();
}
}
exit(0);
}
/* $Id: du.c,v 1.15 2000/02/21 17:27:17 erik Exp $ */
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