Superficial changes to make the exclude/include code easier to understand
[oweals/busybox.git] / archival / cpio.c
1 /* vi: set sw=4 ts=4: */
2 /*
3  * Mini cpio implementation for busybox
4  *
5  * Copyright (C) 2001 by Glenn McGrath 
6  *
7  * This program is free software; you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published by
9  * the Free Software Foundation; either version 2 of the License, or
10  * (at your option) any later version.
11  *
12  * This program is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * General Public License for more details.
16  *
17  * You should have received a copy of the GNU General Public License
18  * along with this program; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  *
21  * Limitations:
22  *              Doesn't check CRC's
23  *              Only supports new ASCII and CRC formats
24  *
25  */
26 #include <fcntl.h>
27 #include <getopt.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include "busybox.h"
32
33 extern int cpio_main(int argc, char **argv)
34 {
35         FILE *src_stream = stdin;
36         char **extract_names = NULL;
37         int extract_function = 0;
38         int num_of_entries = 0;
39         int opt = 0;
40         mode_t oldmask = 0;
41
42         while ((opt = getopt(argc, argv, "idmuvtF:")) != -1) {
43                 switch (opt) {
44                 case 'i': // extract
45                         extract_function |= extract_all_to_fs;
46                         break;
47                 case 'd': // create _leading_ directories
48                         extract_function |= extract_create_leading_dirs;
49                         oldmask = umask(077); /* Make make_directory act like GNU cpio */
50                         break;
51                 case 'm': // preserve modification time
52                         extract_function |= extract_preserve_date;
53                         break;
54                 case 'v': // verbosly list files
55                         extract_function |= extract_verbose_list;
56                         break;
57                 case 'u': // unconditional
58                         extract_function |= extract_unconditional;
59                         break;
60                 case 't': // list files
61                         extract_function |= extract_list;
62                         break;
63                 case 'F':
64                         src_stream = xfopen(optarg, "r");
65                         break;
66                 default:
67                         show_usage();
68                 }
69         }
70
71         if ((extract_function & extract_all_to_fs) && (extract_function & extract_list)) {
72                 extract_function ^= extract_all_to_fs; /* If specify t, don't extract*/
73         }
74
75         if ((extract_function & extract_all_to_fs) && (extract_function & extract_verbose_list)) {
76                 /* The meaning of v changes on extract */
77                 extract_function ^= extract_verbose_list;
78                 extract_function |= extract_list;
79         }
80
81         while (optind < argc) {
82                 extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
83                 extract_names[num_of_entries] = xstrdup(argv[optind]);
84                 num_of_entries++;
85                 extract_names[num_of_entries] = NULL;
86                 optind++;
87         }
88
89         unarchive(src_stream, stdout, &get_header_cpio, extract_function, "./", extract_names);
90         if (oldmask) {
91                 umask(oldmask); /* Restore umask if we changed it */
92         }
93         return EXIT_SUCCESS;
94 }
95