126 #define	REQUIRE(co, e)	if (!(co)) { SETERROR(e); }  macro
127 #define	MUSTSEE(c, e)	REQUIRE(MORE() && PEEK() == (c), e)
128 #define	MUSTEAT(c, e)	REQUIRE(MORE() && GETNEXT() == (c), e)
129 #define	MUSTNOTSEE(c, e)	REQUIRE(!MORE() || PEEK() != (c), e)
262 		REQUIRE(HERE() != conc, REG_EMPTY);	/* require nonempty */  in p_ere()
307 		REQUIRE(MORE(), REG_EPAREN);  in p_ere_exp()
363 		REQUIRE(MORE(), REG_EESCAPE);  in p_ere_exp()
368 		REQUIRE(!MORE() || !isdigit((uch)PEEK()), REG_BADRPT);  in p_ere_exp()
384 	REQUIRE(!wascaret, REG_BADRPT);  in p_ere_exp()
411 				REQUIRE(count <= count2, REG_BADBR);  in p_ere_exp()
420 			REQUIRE(MORE(), REG_EBRACE);  in p_ere_exp()
441 	REQUIRE(MORE(), REG_EMPTY);  in p_str()
481 	REQUIRE(HERE() != start, REG_EMPTY);	/* require nonempty */  in p_bre()
504 		REQUIRE(MORE(), REG_EESCAPE);  in p_simp_re()
534 		REQUIRE(EATTWO('\\', ')'), REG_EPAREN);  in p_simp_re()
564 		REQUIRE(starordinary, REG_BADRPT);  in p_simp_re()
582 				REQUIRE(count <= count2, REG_BADBR);  in p_simp_re()
591 			REQUIRE(MORE(), REG_EBRACE);  in p_simp_re()
614 	REQUIRE(ndigits > 0 && count <= DUPMAX, REG_BADBR);  in p_count()
727 		REQUIRE(MORE(), REG_EBRACK);  in p_b_term()
729 		REQUIRE(c != '-' && c != ']', REG_ECTYPE);  in p_b_term()
731 		REQUIRE(MORE(), REG_EBRACK);  in p_b_term()
732 		REQUIRE(EATTWO(':', ']'), REG_ECTYPE);  in p_b_term()
736 		REQUIRE(MORE(), REG_EBRACK);  in p_b_term()
738 		REQUIRE(c != '-' && c != ']', REG_ECOLLATE);  in p_b_term()
740 		REQUIRE(MORE(), REG_EBRACK);  in p_b_term()
741 		REQUIRE(EATTWO('=', ']'), REG_ECOLLATE);  in p_b_term()
756 		REQUIRE(start <= finish, REG_ERANGE);  in p_b_term()
816 	REQUIRE(MORE(), REG_EBRACK);  in p_b_symbol()
822 	REQUIRE(EATTWO('.', ']'), REG_ECOLLATE);  in p_b_symbol()