memmove.c

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#include <string.h>
 
#if defined(_MSC_VER) && (_MSC_VER >= 1910 || !defined(_WIN64))
#pragma function(memmove)
#endif /* _MSC_VER */
 
/* NOTE: This code is duplicated in memcpy function */
void * __cdecl memmove(void *dest,const void *src,size_t count)
{
    char *char_dest = (char *)dest;
    char *char_src = (char *)src;
 
    if ((char_dest <= char_src) || (char_dest >= (char_src+count)))
    {
        /*  non-overlapping buffers */
        while(count > 0)
    {
            *char_dest = *char_src;
            char_dest++;
            char_src++;
            count--;
    }
    }
    else
    {
        /* overlaping buffers */
        char_dest = (char *)dest + count - 1;
        char_src = (char *)src + count - 1;
 
        while(count > 0)
    {
           *char_dest = *char_src;
           char_dest--;
           char_src--;
           count--;
    }
    }
 
    return dest;
}