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/* $OpenBSD: var.c,v 1.3 1997/02/25 00:04:31 downsj Exp $ */
/* $NetBSD: var.c,v 1.4 1995/09/28 10:35:01 tls Exp $ */
/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Edward Wang at The University of California, Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)var.c 8.1 (Berkeley) 6/6/93";
#else
static char rcsid[] = "$OpenBSD: var.c,v 1.3 1997/02/25 00:04:31 downsj Exp $";
#endif
#endif /* not lint */
#include "value.h"
#include "var.h"
#include "string.h"
#include <stdlib.h>
struct var *
var_set1(head, name, v)
struct var **head;
char *name;
struct value *v;
{
register struct var **p;
register struct var *r;
struct value val;
/* do this first, easier to recover */
val = *v;
if (val.v_type == V_STR && val.v_str != 0 &&
(val.v_str = str_cpy(val.v_str)) == 0)
return 0;
if (*(p = var_lookup1(head, name)) == 0) {
r = (struct var *) malloc(sizeof (struct var));
if (r == 0) {
val_free(val);
return 0;
}
if ((r->r_name = str_cpy(name)) == 0) {
val_free(val);
free((char *) r);
return 0;
}
r->r_left = r->r_right = 0;
*p = r;
} else {
r = *p;
val_free(r->r_val);
}
r->r_val = val;
return r;
}
struct var *
var_setstr1(head, name, str)
struct var **head;
char *name;
char *str;
{
struct value v;
v.v_type = V_STR;
v.v_str = str;
return var_set1(head, name, &v);
}
struct var *
var_setnum1(head, name, num)
struct var **head;
char *name;
int num;
{
struct value v;
v.v_type = V_NUM;
v.v_num = num;
return var_set1(head, name, &v);
}
var_unset1(head, name)
struct var **head;
char *name;
{
register struct var **p;
register struct var *r;
if (*(p = var_lookup1(head, name)) == 0)
return -1;
r = *p;
*p = r->r_left;
while (*p != 0)
p = &(*p)->r_right;
*p = r->r_right;
val_free(r->r_val);
str_free(r->r_name);
free((char *) r);
return 0;
}
struct var **
var_lookup1(p, name)
register struct var **p;
register char *name;
{
register cmp;
while (*p != 0) {
if ((cmp = strcmp(name, (*p)->r_name)) < 0)
p = &(*p)->r_left;
else if (cmp > 0)
p = &(*p)->r_right;
else
break;
}
return p;
}
var_walk1(r, func, a)
register struct var *r;
int (*func)();
long a;
{
if (r == 0)
return 0;
if (var_walk1(r->r_left, func, a) < 0 || (*func)(a, r) < 0
|| var_walk1(r->r_right, func, a) < 0)
return -1;
return 0;
}
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