ZealOS/zealbooter/lib/memmove.c

/* memmove( void *, const void *, size_t )
   This file is part of the Public Domain C Library (PDCLib).
   Permission is granted to use, modify, and / or redistribute at will.
*/

#include <stddef.h>

void *memmove(void *s1, const void *s2, size_t n)
{
    char *dest = (char *)s1;
    const char *src = (const char *)s2;

    if (dest <= src)
    {
        while (n--)
        {
            *dest++ = *src++;
        }
    }
    else
    {
        src += n;
        dest += n;

        while (n--)
        {
            *--dest = *--src;
        }
    }

    return s1;
}