usr.bin/window/var.c

   1 /*      @(#)var.c       8.1 (Berkeley) 6/6/93   */
   2 /*      $NetBSD: var.c,v 1.10 2009/04/14 08:50:06 lukem Exp $   */
   3
   4 /*
   5  * Copyright (c) 1983, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Edward Wang at The University of California, Berkeley.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <stdlib.h>
  37 #include <string.h>
  38 #include "value.h"
  39 #define EXTERN
  40 #include "var.h"
  41 #undef  EXTERN
  42 #include "window_string.h"
  43
  44 struct var *
  45 var_set1(struct var **head, const char *name, struct value *v)
  46 {
  47         struct var **p;
  48         struct var *r;
  49         struct value val;
  50
  51         /* do this first, easier to recover */
  52         val = *v;
  53         if (val.v_type == V_STR && val.v_str != 0 &&
  54             (val.v_str = str_cpy(val.v_str)) == 0)
  55                 return 0;
  56         if (*(p = var_lookup1(head, name)) == NULL) {
  57                 r = (struct var *) malloc(sizeof (struct var));
  58                 if (r == NULL) {
  59                         val_free(val);
  60                         return 0;
  61                 }
  62                 if ((r->r_name = str_cpy(name)) == 0) {
  63                         val_free(val);
  64                         free((char *) r);
  65                         return 0;
  66                 }
  67                 r->r_left = r->r_right = 0;
  68                 *p = r;
  69         } else {
  70                 r = *p;
  71                 val_free(r->r_val);
  72         }
  73         r->r_val = val;
  74         return r;
  75 }
  76
  77 struct var *
  78 var_setstr1(struct var **head, const char *name, char *str)
  79 {
  80         struct value v;
  81
  82         v.v_type = V_STR;
  83         v.v_str = str;
  84         return var_set1(head, name, &v);
  85 }
  86
  87 struct var *
  88 var_setnum1(struct var **head, const char *name, int num)
  89 {
  90         struct value v;
  91
  92         v.v_type = V_NUM;
  93         v.v_num = num;
  94         return var_set1(head, name, &v);
  95 }
  96
  97 int
  98 var_unset1(struct var **head, const char *name)
  99 {
 100         struct var **p;
 101         struct var *r;
 102
 103         if (*(p = var_lookup1(head, name)) == NULL)
 104                 return -1;
 105         r = *p;
 106         *p = r->r_left;
 107         while (*p != NULL)
 108                 p = &(*p)->r_right;
 109         *p = r->r_right;
 110         val_free(r->r_val);
 111         str_free(r->r_name);
 112         free((char *) r);
 113         return 0;
 114 }
 115
 116 struct var **
 117 var_lookup1(struct var **p, const char *name)
 118 {
 119         int cmp;
 120
 121         while (*p != NULL) {
 122                 if ((cmp = strcmp(name, (*p)->r_name)) < 0)
 123                         p = &(*p)->r_left;
 124                 else if (cmp > 0)
 125                         p = &(*p)->r_right;
 126                 else
 127                         break;
 128         }
 129         return p;
 130 }
 131
 132 int
 133 var_walk1(struct var *r, int (*func) (void *, struct var *), void *a)
 134 {
 135         if (r == NULL)
 136                 return 0;
 137         if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
 138             || var_walk1(r->r_right, func, a) < 0)
 139                 return -1;
 140         return 0;
 141 }