/* nv_pair_list.c - the opkg package management system

   Carl D. Worth

   Copyright (C) 2001 University of Southern California

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.
*/

#include "nv_pair.h"
#include "void_list.h"
#include "nv_pair_list.h"
#include "libbb/libbb.h"

void nv_pair_list_init(nv_pair_list_t * list)
{
	void_list_init((void_list_t *) list);
}

void nv_pair_list_deinit(nv_pair_list_t * list)
{
	nv_pair_list_elt_t *pos;
	nv_pair_t *nv_pair;

	while (!void_list_empty(list)) {
		pos = nv_pair_list_pop(list);
		if (!pos)
			break;
		nv_pair = (nv_pair_t *) pos->data;
		nv_pair_deinit(nv_pair);
		/* malloced in nv_pair_list_append */
		free(nv_pair);
		pos->data = NULL;
		free(pos);
	}
	void_list_deinit((void_list_t *) list);
}

nv_pair_t *nv_pair_list_append(nv_pair_list_t * list, const char *name,
			       const char *value)
{
	/* freed in nv_pair_list_deinit */
	nv_pair_t *nv_pair = xcalloc(1, sizeof(nv_pair_t));
	nv_pair_init(nv_pair, name, value);
	void_list_append((void_list_t *) list, nv_pair);

	return nv_pair;
}

void nv_pair_list_push(nv_pair_list_t * list, nv_pair_t * data)
{
	void_list_push((void_list_t *) list, data);
}

nv_pair_list_elt_t *nv_pair_list_pop(nv_pair_list_t * list)
{
	return (nv_pair_list_elt_t *) void_list_pop((void_list_t *) list);
}

char *nv_pair_list_find(nv_pair_list_t * list, char *name)
{
	nv_pair_list_elt_t *iter;
	nv_pair_t *nv_pair;

	list_for_each_entry(iter, &list->head, node) {
		nv_pair = (nv_pair_t *) iter->data;
		if (strcmp(nv_pair->name, name) == 0) {
			return nv_pair->value;
		}
	}
	return NULL;
}

nv_pair_list_elt_t *nv_pair_list_first(nv_pair_list_t * list)
{
	return (nv_pair_list_elt_t *) void_list_first((void_list_t *) list);
}

nv_pair_list_elt_t *nv_pair_list_prev(nv_pair_list_t * list,
				      nv_pair_list_elt_t * node)
{
	return (nv_pair_list_elt_t *) void_list_prev((void_list_t *) list,
						     (void_list_elt_t *) node);
}

nv_pair_list_elt_t *nv_pair_list_next(nv_pair_list_t * list,
				      nv_pair_list_elt_t * node)
{
	return (nv_pair_list_elt_t *) void_list_next((void_list_t *) list,
						     (void_list_elt_t *) node);
}

nv_pair_list_elt_t *nv_pair_list_last(nv_pair_list_t * list)
{
	return (nv_pair_list_elt_t *) void_list_last((void_list_t *) list);
}
