/*

 *  connection_list.c - ACPI daemon connection list

 *

 *  Copyright (C) 2008, Ted Felix (www.tedfelix.com)

 *

 *  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 of the License, 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.

 *

 *  You should have received a copy of the GNU General Public License

 *  along with this program; if not, write to the Free Software

 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

 *

 *  Tabs at 4

 */

#include <unistd.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "acpid.h"

#include "log.h"

#include "connection_list.h"

#define max(a, b)  (((a)>(b))?(a):(b))

/*---------------------------------------------------------------*/

/* private objects */

static int capacity = 0;

static struct connection *connection_list = NULL;

static int nconnections = 0;

/* fd_set containing all the fd's that come in */

static fd_set allfds;

/* highest fd that is opened */

/* (-2 + 1) causes select() to return immediately */

static int highestfd = -2;

/*---------------------------------------------------------------*/

/* public functions */

int

add_connection(struct connection *p)

{

	if (nconnections < 0)

		return -1;

	/* if the list is full, allocate more space */

	if (nconnections >= capacity) {

		/* no more than 1024 */

		if (capacity > 1024) {

			acpid_log(LOG_ERR, "Too many connections.");

			return -1;

		}

		/* another 20 */

		capacity += 20;

		connection_list =

			realloc(connection_list, sizeof(struct connection) * capacity);

	}

	if (nconnections == 0)

		FD_ZERO(&allfds);

	/* add the connection to the connection list */

	connection_list[nconnections] = *p;

	++nconnections;

	/* add to the fd set */

	FD_SET(p->fd, &allfds);

	highestfd = max(highestfd, p->fd);

	return 0;

}

/*---------------------------------------------------------------*/

void

delete_connection(int fd)

{

	int i;

	/* close anything other than stdin/stdout/stderr */

	if (fd > 2)

		close(fd);

	/* remove from the fd set */

	FD_CLR(fd, &allfds);

	for (i = 0; i < nconnections; ++i) {

		/* if the file descriptors match, delete the connection */

		if (connection_list[i].fd == fd) {

			free(connection_list[i].pathname);

			--nconnections;

			connection_list[i] = connection_list[nconnections];

			break;

		}

	}

	/* prepare for recalculation of highestfd */

	highestfd = -2;

	/* recalculate highestfd */

	for (i = 0; i < nconnections; ++i) {

		highestfd = max(highestfd, connection_list[i].fd);

	}

}

/*---------------------------------------------------------------*/

void

delete_all_connections(void)

{

	/* while there are still connections to delete */

	while (nconnections) {

		/* delete the connection at the end of the list */

		delete_connection(connection_list[nconnections-1].fd);

	}

	free(connection_list);

	connection_list = NULL;

}

/*---------------------------------------------------------------*/

struct connection *

find_connection(int fd)

{

	int i;

	/* for each connection */

	for (i = 0; i < nconnections; ++i) {

		/* if the file descriptors match, return the connection */

		if (connection_list[i].fd == fd)

			return &connection_list[i];

	}

	return NULL;

}

/*---------------------------------------------------------------*/

struct connection *

find_connection_name(char *pathname)

{

	int i;

	/* for each connection */

	for (i = 0; i < nconnections; ++i) {

		/* skip null pathnames */

		if (connection_list[i].pathname == NULL)

			continue;

		/* if the pathname matches, return the connection */

		if (strcmp(connection_list[i].pathname, pathname) == 0)

			return &connection_list[i];

	}

	return NULL;

}

/*---------------------------------------------------------------*/

int 

get_number_of_connections()

{

	return nconnections;

}

/*---------------------------------------------------------------*/

struct connection *

get_connection(int i)

{

	if (i < 0  ||  i >= nconnections)

		return NULL;

	return &connection_list[i];

}

/*---------------------------------------------------------------*/

const fd_set *

get_fdset()

{

	return &allfds;

}

/*---------------------------------------------------------------*/

int

get_highestfd()

{

	return highestfd;

}