window/var.c

   1 /*      $NetBSD: var.c,v 1.5 1997/11/21 08:36:45 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[] = "@(#)var.c       8.1 (Berkeley) 6/6/93";
  43 #else
  44 __RCSID("$NetBSD: var.c,v 1.5 1997/11/21 08:36:45 lukem Exp $");
  45 #endif
  46 #endif /* not lint */
  47
  48 #include <stdlib.h>
  49 #include "value.h"
  50 #define EXTERN
  51 #include "var.h"
  52 #undef  EXTERN
  53 #include "window_string.h"
  54
  55 struct var *
  56 var_set1(head, name, v)
  57         struct var **head;
  58         char *name;
  59         struct value *v;
  60 {
  61         struct var **p;
  62         struct var *r;
  63         struct value val;
  64
  65         /* do this first, easier to recover */
  66         val = *v;
  67         if (val.v_type == V_STR && val.v_str != 0 &&
  68             (val.v_str = str_cpy(val.v_str)) == 0)
  69                 return 0;
  70         if (*(p = var_lookup1(head, name)) == 0) {
  71                 r = (struct var *) malloc(sizeof (struct var));
  72                 if (r == 0) {
  73                         val_free(val);
  74                         return 0;
  75                 }
  76                 if ((r->r_name = str_cpy(name)) == 0) {
  77                         val_free(val);
  78                         free((char *) r);
  79                         return 0;
  80                 }
  81                 r->r_left = r->r_right = 0;
  82                 *p = r;
  83         } else {
  84                 r = *p;
  85                 val_free(r->r_val);
  86         }
  87         r->r_val = val;
  88         return r;
  89 }
  90
  91 struct var *
  92 var_setstr1(head, name, str)
  93         struct var **head;
  94         char *name;
  95         char *str;
  96 {
  97         struct value v;
  98
  99         v.v_type = V_STR;
 100         v.v_str = str;
 101         return var_set1(head, name, &v);
 102 }
 103
 104 struct var *
 105 var_setnum1(head, name, num)
 106         struct var **head;
 107         char *name;
 108         int num;
 109 {
 110         struct value v;
 111
 112         v.v_type = V_NUM;
 113         v.v_num = num;
 114         return var_set1(head, name, &v);
 115 }
 116
 117 int
 118 var_unset1(head, name)
 119         struct var **head;
 120         char *name;
 121 {
 122         struct var **p;
 123         struct var *r;
 124
 125         if (*(p = var_lookup1(head, name)) == 0)
 126                 return -1;
 127         r = *p;
 128         *p = r->r_left;
 129         while (*p != 0)
 130                 p = &(*p)->r_right;
 131         *p = r->r_right;
 132         val_free(r->r_val);
 133         str_free(r->r_name);
 134         free((char *) r);
 135         return 0;
 136 }
 137
 138 struct var **
 139 var_lookup1(p, name)
 140         struct var **p;
 141         char *name;
 142 {
 143         int cmp;
 144
 145         while (*p != 0) {
 146                 if ((cmp = strcmp(name, (*p)->r_name)) < 0)
 147                         p = &(*p)->r_left;
 148                 else if (cmp > 0)
 149                         p = &(*p)->r_right;
 150                 else
 151                         break;
 152         }
 153         return p;
 154 }
 155
 156 int
 157 var_walk1(r, func, a)
 158         struct var *r;
 159         int (*func) __P((void *, struct var *));
 160         void *a;
 161 {
 162         if (r == 0)
 163                 return 0;
 164         if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
 165             || var_walk1(r->r_right, func, a) < 0)
 166                 return -1;
 167         return 0;
 168 }