/*      @(#)var.c       8.1 (Berkeley) 6/6/93   */
/*      $NetBSD: var.c,v 1.10 2009/04/14 08:50:06 lukem 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. 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.
 */

#include <stdlib.h>
#include <string.h>
#include "value.h"
#define EXTERN
#include "var.h"
#undef  EXTERN
#include "window_string.h"

struct var *
var_set1(struct var **head, const char *name, struct value *v)
{
        struct var **p;
        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)) == NULL) {
                r = (struct var *) malloc(sizeof (struct var));
                if (r == NULL) {
                        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(struct var **head, const 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(struct var **head, const char *name, int num)
{
        struct value v;

        v.v_type = V_NUM;
        v.v_num = num;
        return var_set1(head, name, &v);
}

int
var_unset1(struct var **head, const char *name)
{
        struct var **p;
        struct var *r;

        if (*(p = var_lookup1(head, name)) == NULL)
                return -1;
        r = *p;
        *p = r->r_left;
        while (*p != NULL)
                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(struct var **p, const char *name)
{
        int cmp;

        while (*p != NULL) {
                if ((cmp = strcmp(name, (*p)->r_name)) < 0)
                        p = &(*p)->r_left;
                else if (cmp > 0)
                        p = &(*p)->r_right;
                else
                        break;
        }
        return p;
}

int
var_walk1(struct var *r, int (*func) (void *, struct var *), void *a)
{
        if (r == NULL)
                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;
}