C function that prints hex dump of given memory block.

hex_dump.c

/**
 *  hex_dump.c
 *  Copyright (C) 2022  Blue DeviL <[email protected]>
 *  
 *  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 3 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, see <https://www.gnu.org/licenses/>.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void dump_mem(const void *mem_blk, unsigned long long len)
{
    char szLineFmt[] = "0x%016X\t";
    // char szLineFmt2[] = "0x%08X";
    unsigned long long i;
    unsigned long long f32bit = 0xFFFFFFFF;

    if (len < f32bit)
    {
        strcpy(szLineFmt, "0x%08X\t");
    }

    for (i = 0; i < len; i++)
    {

        if (i % 8 == 0)
            printf("   ");
        if (i % 16 == 0)
        {
            printf("\n");
            printf(szLineFmt, i);
        }
        printf("%02X ", *(unsigned char *)(mem_blk + i));
    }
    printf("\n");
}