usr.bin/window/parser4.c

   1 /*      @(#)parser4.c   8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: parser4.c,v 1.9 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 <string.h>
  37 #include "defs.h"
  38 #include "parser.h"
  39
  40 /*
  41  * |            3
  42  * ^            4
  43  * &            5
  44  * == !=        6
  45  * < <= > >=    7
  46  * << >>        8
  47  * + -          9
  48  * * / %        10
  49  */
  50 int
  51 p_expr3_10(int level, struct value *v, char flag)
  52 {
  53         struct value l, r;
  54         int op;
  55         const char *opname = 0;
  56
  57         if ((level == 10 ? p_expr11(v, flag)
  58              : p_expr3_10(level + 1, v, flag)) < 0)
  59                 return -1;
  60         for (;;) {
  61                 switch (level) {
  62                 case 3:
  63                         if (token != T_OR)
  64                                 return 0;
  65                         opname = "|";
  66                         break;
  67                 case 4:
  68                         if (token != T_XOR)
  69                                 return 0;
  70                         opname = "^";
  71                         break;
  72                 case 5:
  73                         if (token != T_AND)
  74                                 return 0;
  75                         opname = "&";
  76                         break;
  77                 case 6:
  78                         if (token == T_EQ)
  79                                 opname = "==";
  80                         else if (token == T_NE)
  81                                 opname = "!=";
  82                         else
  83                                 return 0;
  84                         break;
  85                 case 7:
  86                         switch (token) {
  87                         case T_LT:
  88                                 opname = "<";
  89                                 break;
  90                         case T_LE:
  91                                 opname = "<=";
  92                                 break;
  93                         case T_GT:
  94                                 opname = ">";
  95                                 break;
  96                         case T_GE:
  97                                 opname = ">=";
  98                                 break;
  99                         default:
 100                                 return 0;
 101                         }
 102                         break;
 103                 case 8:
 104                         if (token == T_LS)
 105                                 opname = "<<";
 106                         else if (token == T_RS)
 107                                 opname = ">>";
 108                         else
 109                                 return 0;
 110                         break;
 111                 case 9:
 112                         if (token == T_PLUS)
 113                                 opname = "+";
 114                         else if (token == T_MINUS)
 115                                 opname = "-";
 116                         else
 117                                 return 0;
 118                         break;
 119                 case 10:
 120                         switch (token) {
 121                         case T_MUL:
 122                                 opname = "*";
 123                                 break;
 124                         case T_DIV:
 125                                 opname = "/";
 126                                 break;
 127                         case T_MOD:
 128                                 opname = "%";
 129                                 break;
 130                         default:
 131                                 return 0;
 132                         }
 133                         break;
 134                 }
 135                 l = *v;
 136                 if (l.v_type == V_ERR)
 137                         flag = 0;
 138
 139                 op = token;
 140                 (void) s_gettok();
 141                 if ((level == 10 ? p_expr11(&r, flag)
 142                      : p_expr3_10(level + 1, &r, flag)) < 0) {
 143                         p_synerror();
 144                         val_free(l);
 145                         return -1;
 146                 }
 147
 148                 if (r.v_type == V_ERR)
 149                         flag = 0;
 150                 else switch (op) {
 151                 case T_EQ:
 152                 case T_NE:
 153                 case T_LT:
 154                 case T_LE:
 155                 case T_GT:
 156                 case T_GE:
 157                 case T_PLUS:
 158                         if (l.v_type == V_STR) {
 159                                 if (r.v_type == V_NUM)
 160                                         if (p_convstr(&r) < 0)
 161                                                 flag = 0;
 162                         } else
 163                                 if (r.v_type == V_STR)
 164                                         if (p_convstr(&l) < 0)
 165                                                 flag = 0;
 166                         break;
 167                 case T_LS:
 168                 case T_RS:
 169                         if (r.v_type == V_STR) {
 170                                 char *p = r.v_str;
 171                                 r.v_type = V_NUM;
 172                                 r.v_num = strlen(p);
 173                                 str_free(p);
 174                         }
 175                         break;
 176                 case T_OR:
 177                 case T_XOR:
 178                 case T_AND:
 179                 case T_MINUS:
 180                 case T_MUL:
 181                 case T_DIV:
 182                 case T_MOD:
 183                 default:
 184                         if (l.v_type == V_STR || r.v_type == V_STR) {
 185                                 p_error("%s: Numeric operands required.",
 186                                         opname);
 187                                 flag = 0;
 188                         }
 189                 }
 190                 if (!flag) {
 191                         val_free(l);
 192                         val_free(r);
 193                         v->v_type = V_ERR;
 194                         if (p_abort())
 195                                 return -1;
 196                         continue;
 197                 }
 198
 199                 v->v_type = V_NUM;
 200                 switch (op) {
 201                 case T_EQ:
 202                 case T_NE:
 203                 case T_LT:
 204                 case T_LE:
 205                 case T_GT:
 206                 case T_GE:
 207                         if (l.v_type == V_STR) {
 208                                 int tmp = strcmp(l.v_str, r.v_str);
 209                                 str_free(l.v_str);
 210                                 str_free(r.v_str);
 211                                 l.v_type = V_NUM;
 212                                 l.v_num = tmp;
 213                                 r.v_type = V_NUM;
 214                                 r.v_num = 0;
 215                         }
 216                         break;
 217                 }
 218                 switch (op) {
 219                 case T_OR:
 220                         v->v_num = l.v_num | r.v_num;
 221                         break;
 222                 case T_XOR:
 223                         v->v_num = l.v_num ^ r.v_num;
 224                         break;
 225                 case T_AND:
 226                         v->v_num = l.v_num & r.v_num;
 227                         break;
 228                 case T_EQ:
 229                         v->v_num = l.v_num == r.v_num;
 230                         break;
 231                 case T_NE:
 232                         v->v_num = l.v_num != r.v_num;
 233                         break;
 234                 case T_LT:
 235                         v->v_num = l.v_num < r.v_num;
 236                         break;
 237                 case T_LE:
 238                         v->v_num = l.v_num <= r.v_num;
 239                         break;
 240                 case T_GT:
 241                         v->v_num = l.v_num > r.v_num;
 242                         break;
 243                 case T_GE:
 244                         v->v_num = l.v_num >= r.v_num;
 245                         break;
 246                 case T_LS:
 247                         if (l.v_type == V_STR) {
 248                                 int i;
 249                                 if ((i = strlen(l.v_str)) > r.v_num)
 250                                         i = r.v_num;
 251                                 v->v_str = str_ncpy(l.v_str, i);
 252                                 v->v_type = V_STR;
 253                         } else
 254                                 v->v_num = l.v_num << r.v_num;
 255                         break;
 256                 case T_RS:
 257                         if (l.v_type == V_STR) {
 258                                 int i;
 259                                 if ((i = strlen(l.v_str)) > r.v_num)
 260                                         i -= r.v_num;
 261                                 else
 262                                         i = 0;
 263                                 v->v_str = str_cpy(l.v_str + i);
 264                                 v->v_type = V_STR;
 265                         } else
 266                                 v->v_num = l.v_num >> r.v_num;
 267                         break;
 268                 case T_PLUS:
 269                         if (l.v_type == V_STR) {
 270                                 v->v_str = str_cat(l.v_str, r.v_str);
 271                                 v->v_type = V_STR;
 272                         } else
 273                                 v->v_num = l.v_num + r.v_num;
 274                         break;
 275                 case T_MINUS:
 276                         v->v_num = l.v_num - r.v_num;
 277                         break;
 278                 case T_MUL:
 279                         v->v_num = l.v_num * r.v_num;
 280                         break;
 281                 case T_DIV:
 282                         v->v_num = l.v_num / r.v_num;
 283                         break;
 284                 case T_MOD:
 285                         v->v_num = l.v_num % r.v_num;
 286                         break;
 287                 }
 288                 val_free(l);
 289                 val_free(r);
 290         }
 291         /*NOTREACHED*/
 292 }