1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Edward Wang at The University of California, Berkeley. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)parser3.c 8.1 (Berkeley) 6/6/93 37 * $FreeBSD: src/usr.bin/window/parser3.c,v 1.1.1.1.14.1 2001/05/17 09:45:00 obrien Exp $ 38 * $DragonFly: src/usr.bin/window/parser3.c,v 1.2 2003/06/17 04:29:34 dillon Exp $ 39 */ 40 41 #include "parser.h" 42 43 /* 44 * = 45 * ? : 46 * || 47 * && 48 * | 49 * ^ 50 * & 51 * == != 52 * <= >= 53 * << >> 54 * + - 55 * * / % 56 * unary - + ~ ! 57 */ 58 p_expr(v, flag) 59 register struct value *v; 60 char flag; 61 { 62 struct value t; 63 int ret; 64 65 if (p_expr0(&t, flag) < 0) 66 return -1; 67 68 if (token != T_ASSIGN) { 69 *v = t; 70 return 0; 71 } 72 switch (t.v_type) { 73 case V_NUM: 74 p_error("%d: Not a variable.", t.v_num); 75 case V_ERR: 76 t.v_str = 0; 77 break; 78 } 79 ret = p_assign(t.v_str, v, flag); 80 if (t.v_str != 0) 81 str_free(t.v_str); 82 return ret; 83 } 84 85 /* 86 * ? : 87 */ 88 p_expr0(v, flag) 89 register struct value *v; 90 char flag; 91 { 92 struct value t; 93 char true; 94 95 if (p_expr1(v, flag) < 0) 96 return -1; 97 if (token != T_QUEST) 98 return 0; 99 switch (v->v_type) { 100 case V_NUM: 101 true = v->v_num != 0; 102 break; 103 case V_STR: 104 p_error("?: Numeric left operand required."); 105 str_free(v->v_str); 106 v->v_type = V_ERR; 107 case V_ERR: 108 flag = 0; 109 break; 110 } 111 (void) s_gettok(); 112 v->v_type = V_ERR; 113 if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0) 114 return -1; 115 if (token != T_COLON) { 116 val_free(*v); 117 p_synerror(); 118 return -1; 119 } 120 (void) s_gettok(); 121 return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0); 122 } 123 124 /* 125 * || 126 */ 127 p_expr1(v, flag) 128 register struct value *v; 129 char flag; 130 { 131 char true = 0; 132 133 if (p_expr2(v, flag) < 0) 134 return -1; 135 if (token != T_OROR) 136 return 0; 137 for (;;) { 138 switch (v->v_type) { 139 case V_NUM: 140 v->v_num = true = true || v->v_num != 0; 141 break; 142 case V_STR: 143 p_error("||: Numeric operands required."); 144 str_free(v->v_str); 145 v->v_type = V_ERR; 146 case V_ERR: 147 flag = 0; 148 break; 149 } 150 if (token != T_OROR) 151 return 0; 152 (void) s_gettok(); 153 if (p_expr2(v, flag && !true) < 0) 154 return -1; 155 } 156 } 157 158 /* 159 * && 160 */ 161 p_expr2(v, flag) 162 register struct value *v; 163 char flag; 164 { 165 char true = 1; 166 167 if (p_expr3_10(3, v, flag) < 0) 168 return -1; 169 if (token != T_ANDAND) 170 return 0; 171 for (;;) { 172 switch (v->v_type) { 173 case V_NUM: 174 v->v_num = true = true && v->v_num != 0; 175 break; 176 case V_STR: 177 p_error("&&: Numeric operands required."); 178 str_free(v->v_str); 179 v->v_type = V_ERR; 180 case V_ERR: 181 flag = 0; 182 break; 183 } 184 if (token != T_ANDAND) 185 return 0; 186 (void) s_gettok(); 187 if (p_expr3_10(3, v, flag && true) < 0) 188 return -1; 189 } 190 /*NOTREACHED*/ 191 } 192