usr.bin/window/var.c

   1 /*      $NetBSD: var.c,v 1.10 2009/04/14 08:50:06 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. 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[] = "@(#)var.c       8.1 (Berkeley) 6/6/93";
  39 #else
  40 __RCSID("$NetBSD: var.c,v 1.10 2009/04/14 08:50:06 lukem Exp $");
  41 #endif
  42 #endif /* not lint */
  43
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include "value.h"
  47 #define EXTERN
  48 #include "var.h"
  49 #undef  EXTERN
  50 #include "window_string.h"
  51
  52 struct var *
  53 var_set1(struct var **head, const char *name, struct value *v)
  54 {
  55         struct var **p;
  56         struct var *r;
  57         struct value val;
  58
  59         /* do this first, easier to recover */
  60         val = *v;
  61         if (val.v_type == V_STR && val.v_str != 0 &&
  62             (val.v_str = str_cpy(val.v_str)) == 0)
  63                 return 0;
  64         if (*(p = var_lookup1(head, name)) == 0) {
  65                 r = (struct var *) malloc(sizeof (struct var));
  66                 if (r == 0) {
  67                         val_free(val);
  68                         return 0;
  69                 }
  70                 if ((r->r_name = str_cpy(name)) == 0) {
  71                         val_free(val);
  72                         free((char *) r);
  73                         return 0;
  74                 }
  75                 r->r_left = r->r_right = 0;
  76                 *p = r;
  77         } else {
  78                 r = *p;
  79                 val_free(r->r_val);
  80         }
  81         r->r_val = val;
  82         return r;
  83 }
  84
  85 struct var *
  86 var_setstr1(struct var **head, const char *name, char *str)
  87 {
  88         struct value v;
  89
  90         v.v_type = V_STR;
  91         v.v_str = str;
  92         return var_set1(head, name, &v);
  93 }
  94
  95 struct var *
  96 var_setnum1(struct var **head, const char *name, int num)
  97 {
  98         struct value v;
  99
 100         v.v_type = V_NUM;
 101         v.v_num = num;
 102         return var_set1(head, name, &v);
 103 }
 104
 105 int
 106 var_unset1(struct var **head, const char *name)
 107 {
 108         struct var **p;
 109         struct var *r;
 110
 111         if (*(p = var_lookup1(head, name)) == 0)
 112                 return -1;
 113         r = *p;
 114         *p = r->r_left;
 115         while (*p != 0)
 116                 p = &(*p)->r_right;
 117         *p = r->r_right;
 118         val_free(r->r_val);
 119         str_free(r->r_name);
 120         free((char *) r);
 121         return 0;
 122 }
 123
 124 struct var **
 125 var_lookup1(struct var **p, const char *name)
 126 {
 127         int cmp;
 128
 129         while (*p != 0) {
 130                 if ((cmp = strcmp(name, (*p)->r_name)) < 0)
 131                         p = &(*p)->r_left;
 132                 else if (cmp > 0)
 133                         p = &(*p)->r_right;
 134                 else
 135                         break;
 136         }
 137         return p;
 138 }
 139
 140 int
 141 var_walk1(struct var *r, int (*func) (void *, struct var *), void *a)
 142 {
 143         if (r == 0)
 144                 return 0;
 145         if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
 146             || var_walk1(r->r_right, func, a) < 0)
 147                 return -1;
 148         return 0;
 149 }