xref: /freebsd/lib/libutil/hexdump.c (revision da5432eda807c4b7232d030d5157d5b417ea4f52)
1 /*-
2  * SPDX-License-Identifier: BSD-3-Clause
3  *
4  * Copyright (c) 1986, 1988, 1991, 1993
5  *	The Regents of the University of California.  All rights reserved.
6  * (c) UNIX System Laboratories, Inc.
7  * All or some portions of this file are derived from material licensed
8  * to the University of California by American Telephone and Telegraph
9  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
10  * the permission of UNIX System Laboratories, Inc.
11  *
12  * Redistribution and use in source and binary forms, with or without
13  * modification, are permitted provided that the following conditions
14  * are met:
15  * 1. Redistributions of source code must retain the above copyright
16  *    notice, this list of conditions and the following disclaimer.
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  * 3. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  *
36  *	@(#)subr_prf.c	8.3 (Berkeley) 1/21/94
37  */
38 
39 #include <sys/cdefs.h>
40 #include <sys/types.h>
41 #include <libutil.h>
42 #include <stdio.h>
43 
44 void
45 hexdump(const void *ptr, int length, const char *hdr, int flags)
46 {
47 	int i, j, k;
48 	int cols;
49 	const unsigned char *cp;
50 	char delim;
51 
52 	if ((flags & HD_DELIM_MASK) != 0)
53 		delim = (flags & HD_DELIM_MASK) >> 8;
54 	else
55 		delim = ' ';
56 
57 	if ((flags & HD_COLUMN_MASK) != 0)
58 		cols = flags & HD_COLUMN_MASK;
59 	else
60 		cols = 16;
61 
62 	cp = ptr;
63 	for (i = 0; i < length; i+= cols) {
64 		if (hdr != NULL)
65 			printf("%s", hdr);
66 
67 		if ((flags & HD_OMIT_COUNT) == 0)
68 			printf("%04x  ", i);
69 
70 		if ((flags & HD_OMIT_HEX) == 0) {
71 			for (j = 0; j < cols; j++) {
72 				k = i + j;
73 				if (k < length)
74 					printf("%c%02x", delim, cp[k]);
75 				else
76 					printf("   ");
77 			}
78 		}
79 
80 		if ((flags & HD_OMIT_CHARS) == 0) {
81 			printf("  |");
82 			for (j = 0; j < cols; j++) {
83 				k = i + j;
84 				if (k >= length)
85 					printf(" ");
86 				else if (cp[k] >= ' ' && cp[k] <= '~')
87 					printf("%c", cp[k]);
88 				else
89 					printf(".");
90 			}
91 			printf("|");
92 		}
93 		printf("\n");
94 	}
95 }
96 
97