MASK_INDEX        189 src/char.c     #define MASK_ISSET(cs, ch)   (!!(cs->mask[MASK_INDEX(ch)] & MASK_BIT(ch)))
MASK_INDEX        190 src/char.c     #define MASK_SET(cs, ch)     (cs->mask[MASK_INDEX(ch)] |= MASK_BIT(ch))
MASK_INDEX        191 src/char.c     #define MASK_RESET(cs, ch)   (cs->mask[MASK_INDEX(ch)] &= ~MASK_BIT(ch))