#include<stdio.h>
#include<time.h>
#include<stdlib.h>
#include<string.h>
#include<assert.h>

void hexdump(void *ptr, size_t size) {
    unsigned char *p = ptr;
    unsigned char *end = p + size;
    char ascii[17];
    size_t i;
    for (i = 0; i < 16; ++i) {
        ascii[i] = '\0';
    }
    i = 0;
    while (p != end) {
        if (i % 16 == 0) {
            if (i != 0) {
                printf("  |%s|\n", ascii);
            }
            printf("%p  ", p);
        }
        printf("%02X ", *p);
        if (*p >= ' ' && *p <= '~') {
            ascii[i % 16] = *p;
        } else {
            ascii[i % 16] = '.';
        }
        ++p;
        ++i;
    }
    while (i % 16 != 0) {
        printf("   ");
        ++i;
    }
    printf("  |%s|\n", ascii);
}