/*
 * ----------------------------------------------------------------------------
 * "THE BEER-WARE LICENSE" (Revision 42):
 * Jeroen Domburg <jeroen@spritesmods.com> wrote this file. As long as you retain 
 * this notice you can do whatever you want with this stuff. If we meet some day, 
 * and you think this stuff is worth it, you can buy me a beer in return. 
 * ----------------------------------------------------------------------------
 */
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>

void hexdump (void *addr, int len) {
	int i;
	unsigned char buff[17];
	unsigned char *pc = (unsigned char*)addr;


	if (len == 0) {
		printf("  ZERO LENGTH\n");
		return;
	}
	if (len < 0) {
		printf("  NEGATIVE LENGTH: %i\n",len);
		return;
	}

	// Process every byte in the data.
	for (i = 0; i < len; i++) {
		// Multiple of 16 means new line (with line offset).

		if ((i % 16) == 0) {
			// Just don't print ASCII for the zeroth line.
			if (i != 0)
				printf ("  %s\n", buff);

			// Output the offset.
			printf ("  %04x ", i);
		}

		// Now the hex code for the specific character.
		printf (" %02x", pc[i]);

		// And store a printable ASCII character for later.
		if ((pc[i] < 0x20) || (pc[i] > 0x7e))
			buff[i % 16] = '.';
		else
			buff[i % 16] = pc[i];
		buff[(i % 16) + 1] = '\0';
	}

	// Pad out last line if not exactly 16 characters.
	while ((i % 16) != 0) {
		printf ("	");
		i++;
	}

	// And print the final ASCII bit.
	printf ("  %s\n", buff);
}