usr.bin/window/parser5.c

   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   "$FreeBSD$";
  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 }