window/parser5.c

   1 /*      $NetBSD: parser5.c,v 1.4 1997/11/21 08:36:16 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. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 #include <sys/cdefs.h>
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)parser5.c   8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: parser5.c,v 1.4 1997/11/21 08:36:16 lukem Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include "defs.h"
  49 #include "parser.h"
  50 #include "var.h"
  51
  52 /*
  53  * unary $ $? + - ! ~
  54  */
  55 int
  56 p_expr11(v, flag)
  57         struct value *v;
  58         char flag;
  59 {
  60         int op;
  61         char *opname;
  62
  63         switch (token) {
  64         case T_DOLLAR:
  65                 opname = "$";
  66                 break;
  67         case T_DQ:
  68                 opname = "$?";
  69                 break;
  70         case T_PLUS:
  71                 opname = "unary +";
  72                 break;
  73         case T_MINUS:
  74                 opname = "unary -";
  75                 break;
  76         case T_NOT:
  77                 opname = "!";
  78                 break;
  79         case T_COMP:
  80                 opname = "~";
  81                 break;
  82         default:
  83                 return p_expr12(v, flag);
  84         }
  85         op = token;
  86         (void) s_gettok();
  87         if (p_expr11(v, flag) < 0)
  88                 return -1;
  89         switch (v->v_type) {
  90         case V_NUM:
  91                 break;
  92         case V_STR:
  93                 switch (op) {
  94                 case T_MINUS:
  95                 case T_NOT:
  96                 case T_COMP:
  97                         p_error("%s: Numeric operand required.", opname);
  98                         str_free(v->v_str);
  99                         v->v_type = V_ERR;
 100                         return 0;
 101                 }
 102                 break;
 103         case V_ERR:
 104                 return 0;
 105         }
 106         switch (op) {
 107         case T_DOLLAR:
 108         case T_DQ:
 109                 if (v->v_type == V_NUM) {
 110                         int tmp = cx.x_type == X_BUF && cx.x_arg != 0 &&
 111                                 v->v_num > 0 && v->v_num <= cx.x_narg;
 112                         if (op == T_DQ)
 113                                 v->v_num = tmp;
 114                         else if (tmp)
 115                                 *v = cx.x_arg[v->v_num - 1];
 116                         else {
 117                                 p_error("%d: No such argument.", v->v_num);
 118                                 v->v_type = V_ERR;
 119                         }
 120                 } else {
 121                         char *name = v->v_str;
 122                         struct var *r = var_lookup(name);
 123                         if (op == T_DQ) {
 124                                 v->v_type = V_NUM;
 125                                 v->v_num = r != 0;
 126                         } else if (r != 0)
 127                                 *v = r->r_val;
 128                         else {
 129                                 p_error("%s: Undefined variable.", name);
 130                                 v->v_type = V_ERR;
 131                         }
 132                         str_free(name);
 133                 }
 134                 if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) {
 135                         p_memerror();
 136                         return -1;
 137                 }
 138                 break;
 139         case T_MINUS:
 140                 v->v_num = - v->v_num;
 141                 break;
 142         case T_NOT:
 143                 v->v_num = ! v->v_num;
 144                 break;
 145         case T_COMP:
 146                 v->v_num = ~ v->v_num;
 147                 break;
 148         }
 149         return 0;
 150 }
 151
 152 /*
 153  * string, number, ( expr )
 154  * Plus function calls.
 155  *
 156  * Always return v_type == V_ERR when flag == 0.
 157  */
 158 int
 159 p_expr12(v, flag)
 160         struct value *v;
 161         char flag;
 162 {
 163         v->v_type = V_ERR;
 164         switch (token) {
 165         case T_NUM:
 166                 if (flag) {
 167                         v->v_type = V_NUM;
 168                         v->v_num = token_num;
 169                 }
 170                 (void) s_gettok();
 171                 break;
 172         case T_STR:
 173                 if (flag) {
 174                         v->v_type = V_STR;
 175                         v->v_str = token_str;
 176                 } else
 177                         str_free(token_str);
 178                 (void) s_gettok();
 179                 break;
 180         case T_LP:
 181                 (void) s_gettok();
 182                 if (p_expr(v, flag) < 0) {
 183                         p_synerror();
 184                         return -1;
 185                 }
 186                 if (token != T_RP) {
 187                         p_synerror();
 188                         val_free(*v);
 189                         return -1;
 190                 }
 191                 (void) s_gettok();
 192                 break;
 193         default:
 194                 return -1;
 195         }
 196         while (token == T_LP) {
 197                 char *cmd;
 198
 199                 if (p_convstr(v) < 0)
 200                         return -1;
 201                 cmd = v->v_type == V_STR ? v->v_str : 0;
 202                 if (p_function(cmd, v, flag) < 0) {
 203                         if (cmd)
 204                                 str_free(cmd);
 205                         return -1;
 206                 }
 207                 if (cmd)
 208                         str_free(cmd);
 209         }
 210         return 0;
 211 }