1 /* $OpenBSD: parser3.c,v 1.5 2003/06/03 02:56:23 millert Exp $ */ 2 /* $NetBSD: parser3.c,v 1.3 1995/09/28 10:34:33 tls Exp $ */ 3 4 /* 5 * Copyright (c) 1983, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Edward Wang at The University of California, Berkeley. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)parser3.c 8.1 (Berkeley) 6/6/93"; 39 #else 40 static char rcsid[] = "$OpenBSD: parser3.c,v 1.5 2003/06/03 02:56:23 millert Exp $"; 41 #endif 42 #endif /* not lint */ 43 44 #include "parser.h" 45 46 /* 47 * = 48 * ? : 49 * || 50 * && 51 * | 52 * ^ 53 * & 54 * == != 55 * <= >= 56 * << >> 57 * + - 58 * * / % 59 * unary - + ~ ! 60 */ 61 p_expr(v, flag) 62 struct value *v; 63 char flag; 64 { 65 struct value t; 66 int ret; 67 68 if (p_expr0(&t, flag) < 0) 69 return -1; 70 71 if (token != T_ASSIGN) { 72 *v = t; 73 return 0; 74 } 75 switch (t.v_type) { 76 case V_NUM: 77 p_error("%d: Not a variable.", t.v_num); 78 case V_ERR: 79 t.v_str = 0; 80 break; 81 } 82 ret = p_assign(t.v_str, v, flag); 83 if (t.v_str != 0) 84 str_free(t.v_str); 85 return ret; 86 } 87 88 /* 89 * ? : 90 */ 91 p_expr0(v, flag) 92 struct value *v; 93 char flag; 94 { 95 struct value t; 96 char true; 97 98 if (p_expr1(v, flag) < 0) 99 return -1; 100 if (token != T_QUEST) 101 return 0; 102 switch (v->v_type) { 103 case V_NUM: 104 true = v->v_num != 0; 105 break; 106 case V_STR: 107 p_error("?: Numeric left operand required."); 108 str_free(v->v_str); 109 v->v_type = V_ERR; 110 case V_ERR: 111 flag = 0; 112 break; 113 } 114 (void) s_gettok(); 115 v->v_type = V_ERR; 116 if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0) 117 return -1; 118 if (token != T_COLON) { 119 val_free(*v); 120 p_synerror(); 121 return -1; 122 } 123 (void) s_gettok(); 124 return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0); 125 } 126 127 /* 128 * || 129 */ 130 p_expr1(v, flag) 131 struct value *v; 132 char flag; 133 { 134 char true = 0; 135 136 if (p_expr2(v, flag) < 0) 137 return -1; 138 if (token != T_OROR) 139 return 0; 140 for (;;) { 141 switch (v->v_type) { 142 case V_NUM: 143 v->v_num = true = true || v->v_num != 0; 144 break; 145 case V_STR: 146 p_error("||: Numeric operands required."); 147 str_free(v->v_str); 148 v->v_type = V_ERR; 149 case V_ERR: 150 flag = 0; 151 break; 152 } 153 if (token != T_OROR) 154 return 0; 155 (void) s_gettok(); 156 if (p_expr2(v, flag && !true) < 0) 157 return -1; 158 } 159 } 160 161 /* 162 * && 163 */ 164 p_expr2(v, flag) 165 struct value *v; 166 char flag; 167 { 168 char true = 1; 169 170 if (p_expr3_10(3, v, flag) < 0) 171 return -1; 172 if (token != T_ANDAND) 173 return 0; 174 for (;;) { 175 switch (v->v_type) { 176 case V_NUM: 177 v->v_num = true = true && v->v_num != 0; 178 break; 179 case V_STR: 180 p_error("&&: Numeric operands required."); 181 str_free(v->v_str); 182 v->v_type = V_ERR; 183 case V_ERR: 184 flag = 0; 185 break; 186 } 187 if (token != T_ANDAND) 188 return 0; 189 (void) s_gettok(); 190 if (p_expr3_10(3, v, flag && true) < 0) 191 return -1; 192 } 193 /*NOTREACHED*/ 194 } 195