263 #define	REQUIRE(co, e)	(void)((co) || SETERROR(e))  macro
264 #define	MUSTSEE(c, e)	(REQUIRE(MORE() && PEEK() == (c), e))
265 #define	MUSTEAT(c, e)	(REQUIRE(MORE() && GETNEXT() == (c), e))
266 #define	MUSTNOTSEE(c, e)	(REQUIRE(!MORE() || PEEK() != (c), e))
406 		REQUIRE(HERE() != conc, REG_EMPTY);	/* require nonempty */  in p_ere()
452 		REQUIRE(MORE(), REG_EPAREN);  in p_ere_exp()
508 		REQUIRE(MORE(), REG_EESCAPE);  in p_ere_exp()
540 		REQUIRE(!MORE() || !isdigit((uch)PEEK()), REG_BADRPT);  in p_ere_exp()
556 	REQUIRE(!wascaret, REG_BADRPT);  in p_ere_exp()
583 				REQUIRE(count <= count2, REG_BADBR);  in p_ere_exp()
592 			REQUIRE(MORE(), REG_EBRACE);  in p_ere_exp()
613 	REQUIRE(MORE(), REG_EMPTY);  in p_str()
653 	REQUIRE(HERE() != start, REG_EMPTY);	/* require nonempty */  in p_bre()
676 		REQUIRE(MORE(), REG_EESCAPE);  in p_simp_re()
706 		REQUIRE(EATTWO('\\', ')'), REG_EPAREN);  in p_simp_re()
736 		REQUIRE(starordinary, REG_BADRPT);  in p_simp_re()
754 				REQUIRE(count <= count2, REG_BADBR);  in p_simp_re()
763 			REQUIRE(MORE(), REG_EBRACE);  in p_simp_re()
786 	REQUIRE(ndigits > 0 && count <= DUPMAX, REG_BADBR);  in p_count()
901 		REQUIRE(MORE(), REG_EBRACK);  in p_b_term()
903 		REQUIRE(c != '-' && c != ']', REG_ECTYPE);  in p_b_term()
905 		REQUIRE(MORE(), REG_EBRACK);  in p_b_term()
906 		REQUIRE(EATTWO(':', ']'), REG_ECTYPE);  in p_b_term()
910 		REQUIRE(MORE(), REG_EBRACK);  in p_b_term()
912 		REQUIRE(c != '-' && c != ']', REG_ECOLLATE);  in p_b_term()
914 		REQUIRE(MORE(), REG_EBRACK);  in p_b_term()
915 		REQUIRE(EATTWO('=', ']'), REG_ECOLLATE);  in p_b_term()
930 		REQUIRE(start <= finish, REG_ERANGE);  in p_b_term()
990 	REQUIRE(MORE(), REG_EBRACK);  in p_b_symbol()
996 	REQUIRE(EATTWO('.', ']'), REG_ECOLLATE);  in p_b_symbol()