hex_dump.cpp

#include <cstdio>
void hexDump(const void *buf, int size)
{
    int i,j;
    unsigned char *p = (unsigned char *)buf, tmp[20];

    printf("+0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F|  -- ASCII --\r\n");
    printf("--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+----------------\r\n");
    for (i=0; p-(unsigned char *)buf<size; i++) {
        for (j=0; j<16; j++) {
            tmp[j] = (unsigned char)((*p<0x20||*p>=0x7f)? '.': *p);
            printf("%02X ", (int)*p);
            if (++p-(unsigned char *)buf>=size) {
                tmp[++j] = '\0';
                for (;j<16;j++) {
                    printf("   ");
                }
                break;
            }
        }
        tmp[16] = '\0';
        printf("%s\r\n", tmp);
        if (p-(unsigned char *)buf>=size) {
            break;
        }
    }
}