#include <ctype.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

void hexdump(const void *data, const size_t size, const size_t width) {
    const unsigned char *p = (const unsigned char *)data;
    size_t               i, j;

    for (i = 0; i < size; i += width) {
        printf("%08zx  ", i);

        for (j = 0; j < width; j++) {
            if (i + j < size) {
                printf("%02X ", p[i + j]);
            } else {
                printf("   ");
            }

            if ((j + 1) % 8 == 0)
                printf(" ");
        }

        printf(" |");

        for (j = 0; j < width && i + j < size; j++) {
            unsigned char c = p[i + j];
            printf("%c", isprint(c) ? c : '.');
        }

        printf("|\n");
    }
}