1/* vi: set sw=4 ts=4: */
2/*
3 * Mini ar implementation for busybox
4 *
5 * Copyright (C) 2000 by Glenn McGrath
6 * Written by Glenn McGrath <bug1@optushome.com.au> 1 June 2000
7 *
8 * Based in part on BusyBox tar, Debian dpkg-deb and GNU ar.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 */
25#include <fcntl.h>
26#include <stdlib.h>
27#include <string.h>
28#include <getopt.h>
29#include <unistd.h>
30#include "busybox.h"
31
32extern int ar_main(int argc, char **argv)
33{
34	FILE *src_stream = NULL;
35	char **extract_names = NULL;
36	char ar_magic[8];
37	int extract_function =  extract_unconditional;
38	int opt;
39	int num_of_entries = 0;
40	extern off_t archive_offset;
41
42	while ((opt = getopt(argc, argv, "ovtpx")) != -1) {
43		switch (opt) {
44		case 'o':
45			extract_function |= extract_preserve_date;
46			break;
47		case 'v':
48			extract_function |= extract_verbose_list;
49			break;
50		case 't':
51			extract_function |= extract_list;
52			break;
53		case 'p':
54			extract_function |= extract_to_stdout;
55			break;
56		case 'x':
57			extract_function |= extract_all_to_fs;
58			break;
59		default:
60			show_usage();
61		}
62	}
63
64	/* check the src filename was specified */
65	if (optind == argc) {
66		show_usage();
67	}
68
69	src_stream = xfopen(argv[optind++], "r");
70
71	/* check ar magic */
72	fread(ar_magic, 1, 8, src_stream);
73	archive_offset = 8;
74	if (strncmp(ar_magic,"!<arch>",7) != 0) {
75		error_msg_and_die("invalid magic");
76	}
77
78	/* Create a list of files to extract */
79	while (optind < argc) {
80		extract_names = xrealloc(extract_names, sizeof(char *) * (num_of_entries + 2));
81		extract_names[num_of_entries] = xstrdup(argv[optind]);
82		num_of_entries++;
83		extract_names[num_of_entries] = NULL;
84		optind++;
85	}
86
87	unarchive(src_stream, stdout, &get_header_ar, extract_function, "./", extract_names);
88	return EXIT_SUCCESS;
89}
90