/*
 * call-seq:
 *    File.file?(file_name)   => integer  or  nil
 *
 * Returns <code>nil</code> if <code>file_name</code> doesn't
 * exist or has zero size, the size of the file otherwise.
 */

static VALUE
test_s(obj, fname)
    VALUE obj, fname;
{
    struct stat st;

    if (rb_stat(fname, &st) < 0) return Qnil;
    if (st.st_size == 0) return Qnil;
    return OFFT2NUM(st.st_size);
}