usr.bin/window/parser5.c

   1 /*      $NetBSD: parser5.c,v 1.6 2003/08/07 11:17:29 agc 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 1.6 2003/08/07 11:17:29 agc 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 }