_P 26 include/linux/ctype.h #define isgraph(c) ((__ismask(c)&(_P|_U|_L|_D)) != 0) _P 28 include/linux/ctype.h #define isprint(c) ((__ismask(c)&(_P|_U|_L|_D|_SP)) != 0) _P 29 include/linux/ctype.h #define ispunct(c) ((__ismask(c)&(_P)) != 0)