/* $NetBSD: parser3.c,v 1.4 1997/11/21 08:36:14 lukem Exp $ */ /* * Copyright (c) 1983, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Edward Wang at The University of California, Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> #ifndef lint #if 0 static char sccsid[] = "@(#)parser3.c 8.1 (Berkeley) 6/6/93"; #else __RCSID("$NetBSD: parser3.c,v 1.4 1997/11/21 08:36:14 lukem Exp $"); #endif #endif /* not lint */ #include "defs.h" #include "parser.h" /* * = * ? : * || * && * | * ^ * & * == != * <= >= * << >> * + - * * / % * unary - + ~ ! */ int p_expr(v, flag) struct value *v; char flag; { struct value t; int ret; if (p_expr0(&t, flag) < 0) return -1; if (token != T_ASSIGN) { *v = t; return 0; } switch (t.v_type) { case V_NUM: p_error("%d: Not a variable.", t.v_num); case V_ERR: t.v_str = 0; break; } ret = p_assign(t.v_str, v, flag); if (t.v_str != 0) str_free(t.v_str); return ret; } /* * ? : */ int p_expr0(v, flag) struct value *v; char flag; { struct value t; char true = 0; if (p_expr1(v, flag) < 0) return -1; if (token != T_QUEST) return 0; switch (v->v_type) { case V_NUM: true = v->v_num != 0; break; case V_STR: p_error("?: Numeric left operand required."); str_free(v->v_str); v->v_type = V_ERR; case V_ERR: flag = 0; break; } (void) s_gettok(); v->v_type = V_ERR; if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0) return -1; if (token != T_COLON) { val_free(*v); p_synerror(); return -1; } (void) s_gettok(); return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0); } /* * || */ int p_expr1(v, flag) struct value *v; char flag; { char true = 0; if (p_expr2(v, flag) < 0) return -1; if (token != T_OROR) return 0; for (;;) { switch (v->v_type) { case V_NUM: v->v_num = true = true || v->v_num != 0; break; case V_STR: p_error("||: Numeric operands required."); str_free(v->v_str); v->v_type = V_ERR; case V_ERR: flag = 0; break; } if (token != T_OROR) return 0; (void) s_gettok(); if (p_expr2(v, flag && !true) < 0) return -1; } } /* * && */ int p_expr2(v, flag) struct value *v; char flag; { char true = 1; if (p_expr3_10(3, v, flag) < 0) return -1; if (token != T_ANDAND) return 0; for (;;) { switch (v->v_type) { case V_NUM: v->v_num = true = true && v->v_num != 0; break; case V_STR: p_error("&&: Numeric operands required."); str_free(v->v_str); v->v_type = V_ERR; case V_ERR: flag = 0; break; } if (token != T_ANDAND) return 0; (void) s_gettok(); if (p_expr3_10(3, v, flag && true) < 0) return -1; } /*NOTREACHED*/ }