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  * @(#)parser5.c        8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/parser5.c,v 1.1.1.1.14.1 2001/05/17 09:45:00 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/parser5.c,v 1.2 2003/06/17 06:29:34 dillon Exp $
  39  */
  40
  41 #include "parser.h"
  42 #include "var.h"
  43
  44 /*
  45  * unary $ $? + - ! ~
  46  */
  47 p_expr11(v, flag)
  48 register struct value *v;
  49 char flag;
  50 {
  51         int op;
  52         char *opname;
  53
  54         switch (token) {
  55         case T_DOLLAR:
  56                 opname = "$";
  57                 break;
  58         case T_DQ:
  59                 opname = "$?";
  60                 break;
  61         case T_PLUS:
  62                 opname = "unary +";
  63                 break;
  64         case T_MINUS:
  65                 opname = "unary -";
  66                 break;
  67         case T_NOT:
  68                 opname = "!";
  69                 break;
  70         case T_COMP:
  71                 opname = "~";
  72                 break;
  73         default:
  74                 return p_expr12(v, flag);
  75         }
  76         op = token;
  77         (void) s_gettok();
  78         if (p_expr11(v, flag) < 0)
  79                 return -1;
  80         switch (v->v_type) {
  81         case V_NUM:
  82                 break;
  83         case V_STR:
  84                 switch (op) {
  85                 case T_MINUS:
  86                 case T_NOT:
  87                 case T_COMP:
  88                         p_error("%s: Numeric operand required.", opname);
  89                         str_free(v->v_str);
  90                         v->v_type = V_ERR;
  91                         return 0;
  92                 }
  93                 break;
  94         case V_ERR:
  95                 return 0;
  96         }
  97         switch (op) {
  98         case T_DOLLAR:
  99         case T_DQ:
 100                 if (v->v_type == V_NUM) {
 101                         int tmp = cx.x_type == X_BUF && cx.x_arg != 0 &&
 102                                 v->v_num > 0 && v->v_num <= cx.x_narg;
 103                         if (op == T_DQ)
 104                                 v->v_num = tmp;
 105                         else if (tmp)
 106                                 *v = cx.x_arg[v->v_num - 1];
 107                         else {
 108                                 p_error("%d: No such argument.", v->v_num);
 109                                 v->v_type = V_ERR;
 110                         }
 111                 } else {
 112                         char *name = v->v_str;
 113                         struct var *r = var_lookup(name);
 114                         if (op == T_DQ) {
 115                                 v->v_type = V_NUM;
 116                                 v->v_num = r != 0;
 117                         } else if (r != 0)
 118                                 *v = r->r_val;
 119                         else {
 120                                 p_error("%s: Undefined variable.", name);
 121                                 v->v_type = V_ERR;
 122                         }
 123                         str_free(name);
 124                 }
 125                 if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) {
 126                         p_memerror();
 127                         return -1;
 128                 }
 129                 break;
 130         case T_MINUS:
 131                 v->v_num = - v->v_num;
 132                 break;
 133         case T_NOT:
 134                 v->v_num = ! v->v_num;
 135                 break;
 136         case T_COMP:
 137                 v->v_num = ~ v->v_num;
 138                 break;
 139         }
 140         return 0;
 141 }
 142
 143 /*
 144  * string, number, ( expr )
 145  * Plus function calls.
 146  *
 147  * Always return v_type == V_ERR when flag == 0.
 148  */
 149 p_expr12(v, flag)
 150 register struct value *v;
 151 char flag;
 152 {
 153         v->v_type = V_ERR;
 154         switch (token) {
 155         case T_NUM:
 156                 if (flag) {
 157                         v->v_type = V_NUM;
 158                         v->v_num = token_num;
 159                 }
 160                 (void) s_gettok();
 161                 break;
 162         case T_STR:
 163                 if (flag) {
 164                         v->v_type = V_STR;
 165                         v->v_str = token_str;
 166                 } else
 167                         str_free(token_str);
 168                 (void) s_gettok();
 169                 break;
 170         case T_LP:
 171                 (void) s_gettok();
 172                 if (p_expr(v, flag) < 0) {
 173                         p_synerror();
 174                         return -1;
 175                 }
 176                 if (token != T_RP) {
 177                         p_synerror();
 178                         val_free(*v);
 179                         return -1;
 180                 }
 181                 (void) s_gettok();
 182                 break;
 183         default:
 184                 return -1;
 185         }
 186         while (token == T_LP) {
 187                 char *cmd;
 188
 189                 if (p_convstr(v) < 0)
 190                         return -1;
 191                 cmd = v->v_type == V_STR ? v->v_str : 0;
 192                 if (p_function(cmd, v, flag) < 0) {
 193                         if (cmd)
 194                                 str_free(cmd);
 195                         return -1;
 196                 }
 197                 if (cmd)
 198                         str_free(cmd);
 199         }
 200         return 0;
 201 }