usr.bin/window/var.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  * @(#)var.c    8.1 (Berkeley) 6/6/93
  37  * $FreeBSD: src/usr.bin/window/var.c,v 1.2.6.2 2001/05/17 09:45:01 obrien Exp $
  38  * $DragonFly: src/usr.bin/window/var.c,v 1.3 2005/02/28 13:57:05 joerg Exp $
  39  */
  40
  41 #include "value.h"
  42 #include "var.h"
  43 #include "mystring.h"
  44
  45 struct var *
  46 var_set1(head, name, v)
  47 struct var **head;
  48 char *name;
  49 struct value *v;
  50 {
  51         register struct var **p;
  52         register struct var *r;
  53         struct value val;
  54
  55         /* do this first, easier to recover */
  56         val = *v;
  57         if (val.v_type == V_STR && val.v_str != 0 &&
  58             (val.v_str = str_cpy(val.v_str)) == 0)
  59                 return 0;
  60         if (*(p = var_lookup1(head, name)) == 0) {
  61                 r = (struct var *) malloc(sizeof (struct var));
  62                 if (r == 0) {
  63                         val_free(val);
  64                         return 0;
  65                 }
  66                 if ((r->r_name = str_cpy(name)) == 0) {
  67                         val_free(val);
  68                         free((char *) r);
  69                         return 0;
  70                 }
  71                 r->r_left = r->r_right = 0;
  72                 *p = r;
  73         } else {
  74                 r = *p;
  75                 val_free(r->r_val);
  76         }
  77         r->r_val = val;
  78         return r;
  79 }
  80
  81 struct var *
  82 var_setstr1(head, name, str)
  83 struct var **head;
  84 char *name;
  85 char *str;
  86 {
  87         struct value v;
  88
  89         v.v_type = V_STR;
  90         v.v_str = str;
  91         return var_set1(head, name, &v);
  92 }
  93
  94 struct var *
  95 var_setnum1(head, name, num)
  96 struct var **head;
  97 char *name;
  98 int num;
  99 {
 100         struct value v;
 101
 102         v.v_type = V_NUM;
 103         v.v_num = num;
 104         return var_set1(head, name, &v);
 105 }
 106
 107 var_unset1(head, name)
 108 struct var **head;
 109 char *name;
 110 {
 111         register struct var **p;
 112         register struct var *r;
 113
 114         if (*(p = var_lookup1(head, name)) == 0)
 115                 return -1;
 116         r = *p;
 117         *p = r->r_left;
 118         while (*p != 0)
 119                 p = &(*p)->r_right;
 120         *p = r->r_right;
 121         val_free(r->r_val);
 122         str_free(r->r_name);
 123         free((char *) r);
 124         return 0;
 125 }
 126
 127 struct var **
 128 var_lookup1(p, name)
 129 register struct var **p;
 130 register char *name;
 131 {
 132         register cmp;
 133
 134         while (*p != 0) {
 135                 if ((cmp = strcmp(name, (*p)->r_name)) < 0)
 136                         p = &(*p)->r_left;
 137                 else if (cmp > 0)
 138                         p = &(*p)->r_right;
 139                 else
 140                         break;
 141         }
 142         return p;
 143 }
 144
 145 var_walk1(r, func, a)
 146 register struct var *r;
 147 int (*func)();
 148 long a;
 149 {
 150         if (r == 0)
 151                 return 0;
 152         if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
 153             || var_walk1(r->r_right, func, a) < 0)
 154                 return -1;
 155         return 0;
 156 }