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

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

    for (i = 0; i < size; i += 16) {
        // Print offset
        printf("%08zx  ", i);

        // Print hex bytes
        for (j = 0; j < 16; j++) {
            if (i + j < size) {
                printf("%02X ", p[i + j]);
            } else {
                printf("   "); // padding for incomplete lines
            }
            if (j == 7)
                printf(" "); // extra space in middle
        }

        printf(" |");

        // Print ASCII characters
        for (j = 0; j < 16 && i + j < size; j++) {
            unsigned char c = p[i + j];
            printf("%c", isprint(c) ? c : '.');
        }

        printf("|\n");
    }
}