zero?(p1)
public
Returns true if the named file exists and has a zero size.
file_name can be an IO object.
static VALUE
rb_file_zero_p(VALUE obj, VALUE fname)
{
struct stat st;
if (rb_stat(fname, &st) < 0) return Qfalse;
if (st.st_size == 0) return Qtrue;
return Qfalse;
}