1 /* $NetBSD: parser5.c,v 1.7 2009/04/14 08:50:06 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1983, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Edward Wang at The University of California, Berkeley. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #ifndef lint 37 #if 0 38 static char sccsid[] = "@(#)parser5.c 8.1 (Berkeley) 6/6/93"; 39 #else 40 __RCSID("$NetBSD: parser5.c,v 1.7 2009/04/14 08:50:06 lukem Exp $"); 41 #endif 42 #endif /* not lint */ 43 44 #include "defs.h" 45 #include "parser.h" 46 #include "var.h" 47 48 /* 49 * unary $ $? + - ! ~ 50 */ 51 int 52 p_expr11(struct value *v, char flag) 53 { 54 int op; 55 const char *opname; 56 57 switch (token) { 58 case T_DOLLAR: 59 opname = "$"; 60 break; 61 case T_DQ: 62 opname = "$?"; 63 break; 64 case T_PLUS: 65 opname = "unary +"; 66 break; 67 case T_MINUS: 68 opname = "unary -"; 69 break; 70 case T_NOT: 71 opname = "!"; 72 break; 73 case T_COMP: 74 opname = "~"; 75 break; 76 default: 77 return p_expr12(v, flag); 78 } 79 op = token; 80 (void) s_gettok(); 81 if (p_expr11(v, flag) < 0) 82 return -1; 83 switch (v->v_type) { 84 case V_NUM: 85 break; 86 case V_STR: 87 switch (op) { 88 case T_MINUS: 89 case T_NOT: 90 case T_COMP: 91 p_error("%s: Numeric operand required.", opname); 92 str_free(v->v_str); 93 v->v_type = V_ERR; 94 return 0; 95 } 96 break; 97 case V_ERR: 98 return 0; 99 } 100 switch (op) { 101 case T_DOLLAR: 102 case T_DQ: 103 if (v->v_type == V_NUM) { 104 int tmp = cx.x_type == X_BUF && cx.x_arg != 0 && 105 v->v_num > 0 && v->v_num <= cx.x_narg; 106 if (op == T_DQ) 107 v->v_num = tmp; 108 else if (tmp) 109 *v = cx.x_arg[v->v_num - 1]; 110 else { 111 p_error("%d: No such argument.", v->v_num); 112 v->v_type = V_ERR; 113 } 114 } else { 115 char *name = v->v_str; 116 struct var *r = var_lookup(name); 117 if (op == T_DQ) { 118 v->v_type = V_NUM; 119 v->v_num = r != 0; 120 } else if (r != 0) 121 *v = r->r_val; 122 else { 123 p_error("%s: Undefined variable.", name); 124 v->v_type = V_ERR; 125 } 126 str_free(name); 127 } 128 if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) { 129 p_memerror(); 130 return -1; 131 } 132 break; 133 case T_MINUS: 134 v->v_num = - v->v_num; 135 break; 136 case T_NOT: 137 v->v_num = ! v->v_num; 138 break; 139 case T_COMP: 140 v->v_num = ~ v->v_num; 141 break; 142 } 143 return 0; 144 } 145 146 /* 147 * string, number, ( expr ) 148 * Plus function calls. 149 * 150 * Always return v_type == V_ERR when flag == 0. 151 */ 152 int 153 p_expr12(struct value *v, 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