xref: /freebsd/lib/libutil/hexdump.c (revision a2f733abcff64628b7771a47089628b7327a88bd)

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1986, 1988, 1991, 1993
 *	The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <libutil.h>
#include <stdio.h>

void
hexdump(const void *ptr, int length, const char *hdr, int flags)
{
	int i, j, k;
	int cols;
	const unsigned char *cp;
	char delim;

	if ((flags & HD_DELIM_MASK) != 0)
		delim = (flags & HD_DELIM_MASK) >> 8;
	else
		delim = ' ';

	if ((flags & HD_COLUMN_MASK) != 0)
		cols = flags & HD_COLUMN_MASK;
	else
		cols = 16;

	cp = ptr;
	for (i = 0; i < length; i+= cols) {
		if (hdr != NULL)
			printf("%s", hdr);

		if ((flags & HD_OMIT_COUNT) == 0)
			printf("%04x  ", i);

		if ((flags & HD_OMIT_HEX) == 0) {
			for (j = 0; j < cols; j++) {
				k = i + j;
				if (k < length)
					printf("%c%02x", delim, cp[k]);
				else
					printf("   ");
			}
		}

		if ((flags & HD_OMIT_CHARS) == 0) {
			printf("  |");
			for (j = 0; j < cols; j++) {
				k = i + j;
				if (k >= length)
					printf(" ");
				else if (cp[k] >= ' ' && cp[k] <= '~')
					printf("%c", cp[k]);
				else
					printf(".");
			}
			printf("|");
		}
		printf("\n");
	}
}