ruby--ruby/missing/memmove.c

/*
 * memmove --- move memories.
 *
 * We supply this routine for those systems that aren't standard yet.
 */

char *
memmove (dst, src, n)
     char *dst, *src;
     int n;
{
  char *ret = dst;

  if (src < dst) {
    src += n;
    dst += n;
    while (n--)
      *--dst = *--src;
  }
  else if (dst < src)
    while (n--)
      *dst++ = *src++;
  return ret;
}