1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
30#include <string.h>
31#include <stand.h>
32
33/*
34 * Display a region in traditional hexdump format.
35 */
36void
37hexdump(caddr_t region, size_t len)
38{
39    caddr_t	line;
40    int		x, c;
41#ifdef HEXDUMP_PAGER
42    /* pager causes linking issues for some apps */
43#define emit(fmt, args...)	{sprintf(lbuf, fmt , ## args); pager_output(lbuf);}
44    char	lbuf[80];
45
46    pager_open();
47#else
48#define emit(fmt, args...) printf(fmt, ## args)
49#endif
50
51    for (line = region; line < (region + len); line += 16) {
52	emit("%08lx  ", (long) line);
53
54	for (x = 0; x < 16; x++) {
55	    if ((line + x) < (region + len)) {
56		emit("%02x ", *(uint8_t *)(line + x));
57	    } else {
58		emit("-- ");
59	    }
60	    if (x == 7)
61		emit(" ");
62	}
63	emit(" |");
64	for (x = 0; x < 16; x++) {
65	    if ((line + x) < (region + len)) {
66		c = *(uint8_t *)(line + x);
67		if ((c < ' ') || (c > '~'))	/* !isprint(c) */
68		    c = '.';
69		emit("%c", c);
70	    } else {
71		emit(" ");
72	    }
73	}
74	emit("|\n");
75    }
76#ifdef HEXDUMP_PAGER
77    pager_close();
78#endif
79}
80