Show bytes and check which endian the machine is.

show_bytes.c

#include <stdio.h>

typedef unsigned char* byte_ptr;
void show_bytes(byte_ptr start, int len){
        for(int i = 0; i < len; i++)
                printf("\t%.2x", start[i]);
        printf("\n");
}

int main(){
        int i = 0x1234567;
        show_bytes((byte_ptr) &i, sizeof(i));
        return 0;
}