1 /* @(#)parser5.c 8.1 (Berkeley) 6/6/93 */ 2 /* $NetBSD: parser5.c,v 1.7 2009/04/14 08:50:06 lukem 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 #include "defs.h" 37 #include "parser.h" 38 #include "var.h" 39 40 /* 41 * unary $ $? + - ! ~ 42 */ 43 int 44 p_expr11(struct value *v, char flag) 45 { 46 int op; 47 const char *opname; 48 49 switch (token) { 50 case T_DOLLAR: 51 opname = "$"; 52 break; 53 case T_DQ: 54 opname = "$?"; 55 break; 56 case T_PLUS: 57 opname = "unary +"; 58 break; 59 case T_MINUS: 60 opname = "unary -"; 61 break; 62 case T_NOT: 63 opname = "!"; 64 break; 65 case T_COMP: 66 opname = "~"; 67 break; 68 default: 69 return p_expr12(v, flag); 70 } 71 op = token; 72 (void) s_gettok(); 73 if (p_expr11(v, flag) < 0) 74 return -1; 75 switch (v->v_type) { 76 case V_NUM: 77 break; 78 case V_STR: 79 switch (op) { 80 case T_MINUS: 81 case T_NOT: 82 case T_COMP: 83 p_error("%s: Numeric operand required.", opname); 84 str_free(v->v_str); 85 v->v_type = V_ERR; 86 return 0; 87 } 88 break; 89 case V_ERR: 90 return 0; 91 } 92 switch (op) { 93 case T_DOLLAR: 94 case T_DQ: 95 if (v->v_type == V_NUM) { 96 int tmp = cx.x_type == X_BUF && cx.x_arg != 0 && 97 v->v_num > 0 && v->v_num <= cx.x_narg; 98 if (op == T_DQ) 99 v->v_num = tmp; 100 else if (tmp) 101 *v = cx.x_arg[v->v_num - 1]; 102 else { 103 p_error("%d: No such argument.", v->v_num); 104 v->v_type = V_ERR; 105 } 106 } else { 107 char *name = v->v_str; 108 struct var *r = var_lookup(name); 109 if (op == T_DQ) { 110 v->v_type = V_NUM; 111 v->v_num = r != NULL; 112 } else if (r != NULL) 113 *v = r->r_val; 114 else { 115 p_error("%s: Undefined variable.", name); 116 v->v_type = V_ERR; 117 } 118 str_free(name); 119 } 120 if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) { 121 p_memerror(); 122 return -1; 123 } 124 break; 125 case T_MINUS: 126 v->v_num = - v->v_num; 127 break; 128 case T_NOT: 129 v->v_num = ! v->v_num; 130 break; 131 case T_COMP: 132 v->v_num = ~ v->v_num; 133 break; 134 } 135 return 0; 136 } 137 138 /* 139 * string, number, ( expr ) 140 * Plus function calls. 141 * 142 * Always return v_type == V_ERR when flag == 0. 143 */ 144 int 145 p_expr12(struct value *v, char flag) 146 { 147 v->v_type = V_ERR; 148 switch (token) { 149 case T_NUM: 150 if (flag) { 151 v->v_type = V_NUM; 152 v->v_num = token_num; 153 } 154 (void) s_gettok(); 155 break; 156 case T_STR: 157 if (flag) { 158 v->v_type = V_STR; 159 v->v_str = token_str; 160 } else 161 str_free(token_str); 162 (void) s_gettok(); 163 break; 164 case T_LP: 165 (void) s_gettok(); 166 if (p_expr(v, flag) < 0) { 167 p_synerror(); 168 return -1; 169 } 170 if (token != T_RP) { 171 p_synerror(); 172 val_free(*v); 173 return -1; 174 } 175 (void) s_gettok(); 176 break; 177 default: 178 return -1; 179 } 180 while (token == T_LP) { 181 char *cmd; 182 183 if (p_convstr(v) < 0) 184 return -1; 185 cmd = v->v_type == V_STR ? v->v_str : 0; 186 if (p_function(cmd, v, flag) < 0) { 187 if (cmd) 188 str_free(cmd); 189 return -1; 190 } 191 if (cmd) 192 str_free(cmd); 193 } 194 return 0; 195 } 196