SYNOPSIS

       #include <string.h>

       void *memcpy(void *dest, const void *src, size_t n);

DESCRIPTION

       The memcpy() function copies n bytes from memory area src to memory area dest.  The memory areas must not overlap.  Use memmove() if

       the memory areas do overlap.

RETURN VALUE

       The memcpy() function returns a pointer to dest.

 void* memcpy2(void* dest, void* src, size_t n) {

     if (dest == NULL || src == NULL) return NULL;

     char* pa = (char*)dest, *pb = (char*)src;

     if (pa <= pb) {

         while (n--) {

             *pa++ = *pb++;

         }

     } else {

         pa += n - ;

         pb += n - ;

         while (n--) {

             *pa-- = *pb--;

         }

     }

     return dest;

 }