/*
 * Copyright (c) 2010 The DragonFly Project.  All rights reserved.
 *
 * This code is derived from software contributed to The DragonFly Project
 * by Matthew Dillon <dillon@backplane.com>
 *
 * 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 DragonFly Project 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 COPYRIGHT HOLDERS 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
 * COPYRIGHT HOLDERS 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 <stand.h>
#include <string.h>
#include "bootstrap.h"
#include "dloader.h"

dvar_t dvbase;
dvar_t *dvlastp = &dvbase;

dvar_t
dvar_get(const char *name)
{
        dvar_t var;

        for (var = dvbase; var; var = var->next) {
                if (strcmp(name, var->name) == 0)
                        return(var);
        }
        return(NULL);
}

void
dvar_set(const char *name, char **data, int count)
{
        dvar_t var;

        for (var = dvbase; var; var = var->next) {
                if (strcmp(name, var->name) == 0)
                        break;
        }
        if (var == NULL) {
                var = malloc(sizeof(*var) + strlen(name) + 1);
                var->name = (char *)(void *)(var + 1);
                strcpy(var->name, name);
                var->next = NULL;
                *dvlastp = var;
                dvlastp = &var->next;
        } else {
                while (--var->count >= 0)
                        free(var->data[var->count]);
                free(var->data);
                /* var->data = NULL; not needed */
        }
        var->count = count;
        var->data = malloc(sizeof(char *) * (count + 1));
        var->data[count] = NULL;
        while (--count >= 0)
                var->data[count] = strdup(data[count]);
}

dvar_t
dvar_copy(dvar_t ovar)
{
        dvar_t var;
        int count;

        var = malloc(sizeof(*var));
        bzero(var, sizeof(*var));
        count = ovar->count;

        var->count = count;
        var->data = malloc(sizeof(char *) * (count + 1));
        var->data[count] = NULL;
        while (--count >= 0)
                var->data[count] = strdup(ovar->data[count]);
        return (var);
}

void
dvar_unset(const char *name)
{
        dvar_t *lastp;
        dvar_t var;
        char *p;

        lastp = &dvbase;
        if ((p = strchr(name, '*')) != NULL) {
                while ((var = *lastp) != NULL) {
                        if (strlen(var->name) >= p - name &&
                            strncmp(var->name, name, p - name) == 0) {
                                dvar_free(lastp);
                        } else {
                                lastp = &var->next;
                        }
                }
        } else {
                while ((var = *lastp) != NULL) {
                        if (strcmp(name, var->name) == 0) {
                                dvar_free(lastp);
                                break;
                        }
                        lastp = &var->next;
                }
        }
}

dvar_t
dvar_first(void)
{
        return(dvbase);
}

dvar_t
dvar_next(dvar_t var)
{
        return(var->next);
}

dvar_t *
dvar_firstp(void)
{
        return(&dvbase);
}

dvar_t *
dvar_nextp(dvar_t var)
{
        return(&var->next);
}

void
dvar_free(dvar_t *lastp)
{
        dvar_t dvar = *lastp;

        if (dvlastp == &dvar->next)
                dvlastp = lastp;
        *lastp = dvar->next;
        while (--dvar->count >= 0)
                free(dvar->data[dvar->count]);
        free(dvar->data);
        free(dvar);
}

int
dvar_istrue(dvar_t var)
{
        int retval = 0;

        if (var != NULL && (strcasecmp(var->data[0], "yes") == 0 ||
            strcasecmp(var->data[0], "true") == 0 ||
            strcasecmp(var->data[0], "on") == 0 ||
            strcasecmp(var->data[0], "1") == 0))
                retval = 1;

        return (retval);
}