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 37 #ifndef lint 38 static char sccsid[] = "@(#)parser5.c 8.1 (Berkeley) 6/6/93"; 39 static char rcsid[] = 40 "$FreeBSD: src/usr.bin/window/parser5.c,v 1.1.1.1.14.1 2001/05/17 09:45:00 obrien Exp $"; 41 #endif /* not lint */ 42 43 #include "parser.h" 44 #include "var.h" 45 46 /* 47 * unary $ $? + - ! ~ 48 */ 49 p_expr11(v, flag) 50 register struct value *v; 51 char flag; 52 { 53 int op; 54 char *opname; 55 56 switch (token) { 57 case T_DOLLAR: 58 opname = "$"; 59 break; 60 case T_DQ: 61 opname = "$?"; 62 break; 63 case T_PLUS: 64 opname = "unary +"; 65 break; 66 case T_MINUS: 67 opname = "unary -"; 68 break; 69 case T_NOT: 70 opname = "!"; 71 break; 72 case T_COMP: 73 opname = "~"; 74 break; 75 default: 76 return p_expr12(v, flag); 77 } 78 op = token; 79 (void) s_gettok(); 80 if (p_expr11(v, flag) < 0) 81 return -1; 82 switch (v->v_type) { 83 case V_NUM: 84 break; 85 case V_STR: 86 switch (op) { 87 case T_MINUS: 88 case T_NOT: 89 case T_COMP: 90 p_error("%s: Numeric operand required.", opname); 91 str_free(v->v_str); 92 v->v_type = V_ERR; 93 return 0; 94 } 95 break; 96 case V_ERR: 97 return 0; 98 } 99 switch (op) { 100 case T_DOLLAR: 101 case T_DQ: 102 if (v->v_type == V_NUM) { 103 int tmp = cx.x_type == X_BUF && cx.x_arg != 0 && 104 v->v_num > 0 && v->v_num <= cx.x_narg; 105 if (op == T_DQ) 106 v->v_num = tmp; 107 else if (tmp) 108 *v = cx.x_arg[v->v_num - 1]; 109 else { 110 p_error("%d: No such argument.", v->v_num); 111 v->v_type = V_ERR; 112 } 113 } else { 114 char *name = v->v_str; 115 struct var *r = var_lookup(name); 116 if (op == T_DQ) { 117 v->v_type = V_NUM; 118 v->v_num = r != 0; 119 } else if (r != 0) 120 *v = r->r_val; 121 else { 122 p_error("%s: Undefined variable.", name); 123 v->v_type = V_ERR; 124 } 125 str_free(name); 126 } 127 if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) { 128 p_memerror(); 129 return -1; 130 } 131 break; 132 case T_MINUS: 133 v->v_num = - v->v_num; 134 break; 135 case T_NOT: 136 v->v_num = ! v->v_num; 137 break; 138 case T_COMP: 139 v->v_num = ~ v->v_num; 140 break; 141 } 142 return 0; 143 } 144 145 /* 146 * string, number, ( expr ) 147 * Plus function calls. 148 * 149 * Always return v_type == V_ERR when flag == 0. 150 */ 151 p_expr12(v, flag) 152 register struct value *v; 153 char flag; 154 { 155 v->v_type = V_ERR; 156 switch (token) { 157 case T_NUM: 158 if (flag) { 159 v->v_type = V_NUM; 160 v->v_num = token_num; 161 } 162 (void) s_gettok(); 163 break; 164 case T_STR: 165 if (flag) { 166 v->v_type = V_STR; 167 v->v_str = token_str; 168 } else 169 str_free(token_str); 170 (void) s_gettok(); 171 break; 172 case T_LP: 173 (void) s_gettok(); 174 if (p_expr(v, flag) < 0) { 175 p_synerror(); 176 return -1; 177 } 178 if (token != T_RP) { 179 p_synerror(); 180 val_free(*v); 181 return -1; 182 } 183 (void) s_gettok(); 184 break; 185 default: 186 return -1; 187 } 188 while (token == T_LP) { 189 char *cmd; 190 191 if (p_convstr(v) < 0) 192 return -1; 193 cmd = v->v_type == V_STR ? v->v_str : 0; 194 if (p_function(cmd, v, flag) < 0) { 195 if (cmd) 196 str_free(cmd); 197 return -1; 198 } 199 if (cmd) 200 str_free(cmd); 201 } 202 return 0; 203 } 204