Oops. Forgot the usleep.c file.
[oweals/busybox.git] / du.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Mini du implementation for busybox
4  *
5  *
6  * Copyright (C) 1999 by Lineo, inc.
7  * Written by John Beppu <beppu@lineo.com>
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  * General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22  *
23  */
24
25 #include "internal.h"
26 #define BB_DECLARE_EXTERN
27 #define bb_need_name_too_long
28 #include "messages.c"
29
30 #include <sys/types.h>
31 #include <fcntl.h>
32 #include <dirent.h>
33 #include <stdio.h>
34 #include <errno.h>
35 #include <sys/param.h>                  /* for PATH_MAX */
36
37 typedef void (Display) (long, char *);
38
39 static const char du_usage[] =
40         "du [OPTION]... [FILE]...\n\n"
41         "Summarize disk space used for each FILE and/or directory.\n"
42         "Disk space is printed in units of 1024 bytes.\n\n"
43         "Options:\n"
44         "\t-l\tcount sizes many times if hard linked\n"
45         "\t-s\tdisplay only a total for each argument\n";
46
47 static int du_depth = 0;
48 static int count_hardlinks = 0;
49
50 static Display *print;
51
52 static void print_normal(long size, char *filename)
53 {
54         fprintf(stdout, "%ld\t%s\n", size, filename);
55 }
56
57 static void print_summary(long size, char *filename)
58 {
59         if (du_depth == 1) {
60                 print_normal(size, filename);
61         }
62 }
63
64 /* tiny recursive du */
65 static long du(char *filename)
66 {
67         struct stat statbuf;
68         long sum;
69         int len;
70
71         if ((lstat(filename, &statbuf)) != 0) {
72                 printf("du: %s: %s\n", filename, strerror(errno));
73                 return 0;
74         }
75
76         du_depth++;
77         sum = (statbuf.st_blocks >> 1);
78
79         /* Don't add in stuff pointed to by symbolic links */
80         if (S_ISLNK(statbuf.st_mode)) {
81                 sum = 0L;
82                 if (du_depth == 1)
83                         print(sum, filename);
84         }
85         if (S_ISDIR(statbuf.st_mode)) {
86                 DIR *dir;
87                 struct dirent *entry;
88
89                 dir = opendir(filename);
90                 if (!dir) {
91                         du_depth--;
92                         return 0;
93                 }
94
95                 len = strlen(filename);
96                 if (filename[len - 1] == '/')
97                         filename[--len] = '\0';
98
99                 while ((entry = readdir(dir))) {
100                         char newfile[PATH_MAX + 1];
101                         char *name = entry->d_name;
102
103                         if ((strcmp(name, "..") == 0)
104                                 || (strcmp(name, ".") == 0)) {
105                                 continue;
106                         }
107
108                         if (len + strlen(name) + 1 > PATH_MAX) {
109                                 fprintf(stderr, name_too_long, "du");
110                                 du_depth--;
111                                 return 0;
112                         }
113                         sprintf(newfile, "%s/%s", filename, name);
114
115                         sum += du(newfile);
116                 }
117                 closedir(dir);
118                 print(sum, filename);
119         }
120         else if (statbuf.st_nlink > 1 && !count_hardlinks) {
121                 /* Add files with hard links only once */
122                 if (is_in_ino_dev_hashtable(&statbuf, NULL)) {
123                         sum = 0L;
124                         if (du_depth == 1)
125                                 print(sum, filename);
126                 }
127                 else {
128                         add_to_ino_dev_hashtable(&statbuf, NULL);
129                 }
130         }
131         du_depth--;
132         return sum;
133 }
134
135 int du_main(int argc, char **argv)
136 {
137         int i;
138         char opt;
139
140         /* default behaviour */
141         print = print_normal;
142
143         /* parse argv[] */
144         for (i = 1; i < argc; i++) {
145                 if (argv[i][0] == '-') {
146                         opt = argv[i][1];
147                         switch (opt) {
148                         case 's':
149                                 print = print_summary;
150                                 break;
151                         case 'l':
152                                 count_hardlinks = 1;
153                                 break;
154                         case 'h':
155                         case '-':
156                                 usage(du_usage);
157                                 break;
158                         default:
159                                 fprintf(stderr, "du: invalid option -- %c\n", opt);
160                                 usage(du_usage);
161                         }
162                 } else {
163                         break;
164                 }
165         }
166
167         /* go through remaining args (if any) */
168         if (i >= argc) {
169                 du(".");
170         } else {
171                 long sum;
172
173                 for (; i < argc; i++) {
174                         sum = du(argv[i]);
175                         if (sum && isDirectory(argv[i], FALSE, NULL)) {
176                                 print_normal(sum, argv[i]);
177                         }
178                         reset_ino_dev_hashtable();
179                 }
180         }
181
182         exit(0);
183 }
184
185 /* $Id: du.c,v 1.16 2000/03/04 21:19:32 erik Exp $ */
186 /*
187 Local Variables:
188 c-file-style: "linux"
189 c-basic-offset: 4
190 tab-width: 4
191 End:
192 */