1/*	$NetBSD: dumptar.c,v 1.1 2004/06/16 14:28:21 christos Exp $	*/
2
3/*-
4 * Copyright (c) 2004 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Christos Zoulas.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <stdio.h>
33#include <err.h>
34#include <fcntl.h>
35#include <sys/stat.h>
36#include <sys/mman.h>
37
38#include "tar.h"
39
40#define ussum(a) 1
41
42static char *
43buf(const char *p, size_t s)
44{
45	static char buf[1024];
46	(void)snprintf(buf, sizeof(buf), "%s", p);
47	buf[s] = '\0';
48	return buf;
49}
50
51int
52intarg(const char *p, size_t s)
53{
54	char *ep, *b = buf(p, s);
55	int r = (int)strtol(p, &ep, 8);
56	return r;
57}
58
59static int
60usdump(void *p)
61{
62	HD_USTAR *t = p;
63	int size = intarg(t->size, sizeof(t->size));
64	size = ((size + 511) / 512) * 512 + 512;
65
66	(void)fprintf(stdout, "*****\n");
67#define PR(a) \
68	(void)fprintf(stdout, #a "=%s\n", buf(t->a, sizeof(t->a)));
69#define IPR(a) \
70	(void)fprintf(stdout, #a "=%d\n", intarg(t->a, sizeof(t->a)));
71#define OPR(a) \
72	(void)fprintf(stdout, #a "=%o\n", intarg(t->a, sizeof(t->a)));
73	PR(name);
74	OPR(mode);
75	IPR(uid);
76	IPR(gid);
77	IPR(size);
78	OPR(mtime);
79	OPR(chksum);
80	(void)fprintf(stdout, "typeflag=%c\n", t->typeflag);
81	PR(linkname);
82	PR(magic);
83	PR(version);
84	PR(uname);
85	PR(gname);
86	OPR(devmajor);
87	OPR(devminor);
88	PR(prefix);
89	return size;
90}
91
92int
93main(int argc, char *argv[])
94{
95	int fd;
96	struct stat st;
97	char *p, *ep;
98
99	if (argc != 2) {
100		(void)fprintf(stderr, "Usage: %s <filename>\n", getprogname());
101		return 1;
102	}
103
104	if ((fd = open(argv[1], O_RDONLY)) == -1)
105		err(1, "Cannot open `%s'", argv[1]);
106
107	if (fstat(fd, &st) == -1)
108		err(1, "Cannot fstat `%s'", argv[1]);
109
110	if ((p = mmap(NULL, (size_t)st.st_size, PROT_READ,
111	    MAP_FILE|MAP_PRIVATE, fd, (off_t)0)) == MAP_FAILED)
112		err(1, "Cannot mmap `%s'", argv[1]);
113	(void)close(fd);
114
115	ep = (char *)p + (size_t)st.st_size;
116
117	for (; p < ep + sizeof(HD_USTAR);) {
118		if (ussum(p))
119			p += usdump(p);
120	}
121	return 0;
122}
123