hexdump.c

/*
 * Copyright 2013-2015 Google Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but without any warranty; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc.
 */

#include <stdio.h>
#include <stdint.h>
#include <stddef.h>
#include <ctype.h>
#include "em100.h"

void hexdump(const void *memory, size_t length)
{
	int i;
	uint8_t *m;
	int all_zero = 0;
	int all_one = 0;

	m = (uint8_t *) memory;

	for (i = 0; i < length; i += 16) {
		int j;

		all_zero++;
		all_one++;
		for (j = 0; j < 16; j++) {
			if (m[i + j] != 0) {
				all_zero = 0;
				break;
			}
		}
		for (j = 0; j < 16; j++) {
			if (m[i + j] != 0xff) {
				all_one = 0;
				break;
			}
		}
		if (all_zero < 2 && all_one < 2) {
			printf( "%08x:", i);
			for (j = 0; j < 16; j++)
				printf( " %02x", m[i + j]);
			printf("  ");
			for (j = 0; j < 16; j++)
				printf( "%c",
				       isprint(m[i + j]) ? m[i + j] : '.');
			printf( "\n");
		} else if (all_zero == 2 || all_one == 2) {
			printf( "...\n");
		}
	}
}