_citrus_region_size
sz = _citrus_region_size(&ms->ms_region);
if (ms->ms_pos + sz > _citrus_region_size(&ms->ms_region))
if (ms->ms_pos + 1 > _citrus_region_size(&ms->ms_region))
if (ms->ms_pos + 2 > _citrus_region_size(&ms->ms_region))
if (ms->ms_pos + 4 > _citrus_region_size(&ms->ms_region))
return (ms->ms_pos >= _citrus_region_size(&ms->ms_region));
sz = _citrus_region_size(&ms->ms_region);
#define _region_size _citrus_region_size