Function rt_memmove

src/klibc/kstring.c:214–237

 */
#ifndef RT_KLIBC_USING_USER_MEMMOVE
void *rt_memmove(void *dest, const void *src, rt_size_t n)
{
#ifdef RT_KLIBC_USING_LIBC_MEMMOVE
    return memmove(dest, src, n);
#else
    char *tmp = (char *)dest, *s = (char *)src;

    if (s < tmp && tmp < s + n)
    {
        tmp += n;
        s += n;

        while (n--)
            *(--tmp) = *(--s);
    }
    else
    {
        while (n--)
            *tmp++ = *s++;
    }

    return dest;
#endif /* RT_KLIBC_USING_LIBC_MEMMOVE */
}
#endif /* RT_KLIBC_USING_USER_MEMMOVE */
RTM_EXPORT(rt_memmove);