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 * @(#)parser5.c 8.1 (Berkeley) 6/6/93 37 * $FreeBSD: src/usr.bin/window/parser5.c,v 1.1.1.1.14.1 2001/05/17 09:45:00 obrien Exp $ 38 * $DragonFly: src/usr.bin/window/parser5.c,v 1.2 2003/06/17 04:29:34 dillon Exp $ 39 */ 40 41 #include "parser.h" 42 #include "var.h" 43 44 /* 45 * unary $ $? + - ! ~ 46 */ 47 p_expr11(v, flag) 48 register struct value *v; 49 char flag; 50 { 51 int op; 52 char *opname; 53 54 switch (token) { 55 case T_DOLLAR: 56 opname = "$"; 57 break; 58 case T_DQ: 59 opname = "$?"; 60 break; 61 case T_PLUS: 62 opname = "unary +"; 63 break; 64 case T_MINUS: 65 opname = "unary -"; 66 break; 67 case T_NOT: 68 opname = "!"; 69 break; 70 case T_COMP: 71 opname = "~"; 72 break; 73 default: 74 return p_expr12(v, flag); 75 } 76 op = token; 77 (void) s_gettok(); 78 if (p_expr11(v, flag) < 0) 79 return -1; 80 switch (v->v_type) { 81 case V_NUM: 82 break; 83 case V_STR: 84 switch (op) { 85 case T_MINUS: 86 case T_NOT: 87 case T_COMP: 88 p_error("%s: Numeric operand required.", opname); 89 str_free(v->v_str); 90 v->v_type = V_ERR; 91 return 0; 92 } 93 break; 94 case V_ERR: 95 return 0; 96 } 97 switch (op) { 98 case T_DOLLAR: 99 case T_DQ: 100 if (v->v_type == V_NUM) { 101 int tmp = cx.x_type == X_BUF && cx.x_arg != 0 && 102 v->v_num > 0 && v->v_num <= cx.x_narg; 103 if (op == T_DQ) 104 v->v_num = tmp; 105 else if (tmp) 106 *v = cx.x_arg[v->v_num - 1]; 107 else { 108 p_error("%d: No such argument.", v->v_num); 109 v->v_type = V_ERR; 110 } 111 } else { 112 char *name = v->v_str; 113 struct var *r = var_lookup(name); 114 if (op == T_DQ) { 115 v->v_type = V_NUM; 116 v->v_num = r != 0; 117 } else if (r != 0) 118 *v = r->r_val; 119 else { 120 p_error("%s: Undefined variable.", name); 121 v->v_type = V_ERR; 122 } 123 str_free(name); 124 } 125 if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) { 126 p_memerror(); 127 return -1; 128 } 129 break; 130 case T_MINUS: 131 v->v_num = - v->v_num; 132 break; 133 case T_NOT: 134 v->v_num = ! v->v_num; 135 break; 136 case T_COMP: 137 v->v_num = ~ v->v_num; 138 break; 139 } 140 return 0; 141 } 142 143 /* 144 * string, number, ( expr ) 145 * Plus function calls. 146 * 147 * Always return v_type == V_ERR when flag == 0. 148 */ 149 p_expr12(v, flag) 150 register struct value *v; 151 char flag; 152 { 153 v->v_type = V_ERR; 154 switch (token) { 155 case T_NUM: 156 if (flag) { 157 v->v_type = V_NUM; 158 v->v_num = token_num; 159 } 160 (void) s_gettok(); 161 break; 162 case T_STR: 163 if (flag) { 164 v->v_type = V_STR; 165 v->v_str = token_str; 166 } else 167 str_free(token_str); 168 (void) s_gettok(); 169 break; 170 case T_LP: 171 (void) s_gettok(); 172 if (p_expr(v, flag) < 0) { 173 p_synerror(); 174 return -1; 175 } 176 if (token != T_RP) { 177 p_synerror(); 178 val_free(*v); 179 return -1; 180 } 181 (void) s_gettok(); 182 break; 183 default: 184 return -1; 185 } 186 while (token == T_LP) { 187 char *cmd; 188 189 if (p_convstr(v) < 0) 190 return -1; 191 cmd = v->v_type == V_STR ? v->v_str : 0; 192 if (p_function(cmd, v, flag) < 0) { 193 if (cmd) 194 str_free(cmd); 195 return -1; 196 } 197 if (cmd) 198 str_free(cmd); 199 } 200 return 0; 201 } 202