busybox/du.c
Erik Andersen 4d1d0113fd Reworked the source so it will compile and run under glibc 2.0.7
and linux kernel 2.0.36 (though the dubious reasons why someone
would want to do that defy imagination ;)
 -Erik
1999-12-17 18:44:15 +00:00

144 lines
2.9 KiB
C

/*
* 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"
#include <sys/types.h>
#include <fcntl.h>
#include <dirent.h>
#include <stdio.h>
#include <errno.h>
#if 0
#include <unistd.h>
#include <sys/stat.h>
#endif
typedef void (Display)(size_t, char *);
static const char du_usage[] =
"Usage: du [OPTION]... [FILE]...\n\n"
"\t-s\tdisplay only a total for each argument\n"
;
static int du_depth = 0;
static Display *print;
static void
print_normal(size_t size, char *filename)
{
fprintf(stdout, "%-7d %s\n", (size >> 1), filename);
}
static void
print_summary(size_t size, char *filename)
{
if (du_depth == 1) {
print_normal(size, filename);
}
}
/* tiny recursive du */
static size_t
du(char *filename)
{
struct stat statbuf;
size_t sum;
if ((lstat(filename, &statbuf)) != 0) {
fprintf(stdout, "du: %s: %s\n", filename, strerror(errno));
return 0;
}
du_depth++;
sum = statbuf.st_blocks;
if (S_ISDIR(statbuf.st_mode)) {
DIR *dir;
struct dirent *entry;
dir = opendir(filename);
if (!dir) { return 0; }
while ((entry = readdir(dir))) {
char newfile[512];
char *name = entry->d_name;
if ( (strcmp(name, "..") == 0)
|| (strcmp(name, ".") == 0))
{ continue; }
sprintf(newfile, "%s/%s", filename, name);
sum += du(newfile);
}
closedir(dir);
print(sum, filename);
}
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 'h':
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 {
int sum;
for ( ; i < argc; i++) {
sum = du(argv[i]);
if ((sum) && (isDirectory(argv[i]))) { print_normal(sum, argv[i]); }
}
}
exit(0);
}
/* $Id: du.c,v 1.8 1999/12/17 18:44:15 erik Exp $ */