memmove.c

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#include <string.h>

/* NOTE: This code is duplicated in memcpy function */
void * 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;
}