[DrEvil]

Here's some of my old code from foxbot. If you want to see more you can download the source at foxbot.net

struct teleport_info_t {
	int iEntranceWaypointIndex;
	int iExitWaypointIndex;
	int iFinalGoal;
	edict_t *pEntrance;
	edict_t *pExit;
	edict_t *pOwner;
	bool bIsUsed;
};

bool BotFindTeleportShortCut(bot_t *pBot)
{
	// This bots team.
	int team = UTIL_GetTeam(pBot->pEdict);
	edict_t *pent = NULL;
	bool bExists;

	// List of friendly teleport owners to this bot.
	std::list<teleport_info_t> teleportOwners;
	std::list<teleport_info_t>::iterator iter;
	teleport_info_t tempTPinfo;

	// Don't do this if the bot has the flag.
	if(pBot->bot_has_flag)
		return false;

	// Search for teleporters.	
	while ((pent = FIND_ENTITY_BY_CLASSNAME(pent, "building_teleporter")) && !FNullEnt(pent))
	{
		bExists = false;

    	// Look to see if there is already a teleport_info for this owner.		
		for (iter = teleportOwners.begin(); iter != teleportOwners.end(); ++iter)
		{		
			// Already exists?
			if ((*iter).pOwner == pent->v.euser1)
			{
				// It's already been made.
				bExists = true;

				// Fill in the appropriate slot
    		    if(pent->v.iuser1 == W_FL_TFC_TELEPORTER_ENTRANCE)
				{
					iter->pEntrance = pent;
    		    	iter->iEntranceWaypointIndex = WaypointFindNearest(pent, 300, -1);
				} 
    			else if(pent->v.iuser1 == W_FL_TFC_TELEPORTER_EXIT)
				{
					iter->pExit = pent;
    		    	iter->iExitWaypointIndex = WaypointFindNearest(pent, 300, -1);
				}
			}
		}

		// Only if it wasn't found above.
		if(!bExists)
		{
			// Set tp info to initial state
			tempTPinfo.bIsUsed = false;
			tempTPinfo.iEntranceWaypointIndex = tempTPinfo.iExitWaypointIndex = -1;
			tempTPinfo.pEntrance = tempTPinfo.pExit = NULL;

			// Make sure the owner is the proper team.
			if (team != UTIL_GetTeam(pent->v.euser1))
				continue;

			// Fill in the appropriate slot
			if(pent->v.iuser1 == W_FL_TFC_TELEPORTER_ENTRANCE)
			{
				tempTPinfo.pOwner = pent->v.euser1;
				tempTPinfo.pEntrance = pent;
    		    tempTPinfo.iEntranceWaypointIndex = WaypointFindNearest(pent, 500, -1);
			} 
			else if(pent->v.iuser1 == W_FL_TFC_TELEPORTER_EXIT)
			{
				tempTPinfo.pOwner = pent->v.euser1;
				tempTPinfo.pExit = pent;
    		    tempTPinfo.iExitWaypointIndex = WaypointFindNearest(pent, 500, -1);
			}

			// Add this to the list of found teleporters.
			teleportOwners.push_back(tempTPinfo);
		}
	}

	// Tag all slots as used that have both entrance and exit
	for (iter = teleportOwners.begin(); iter != teleportOwners.end(); )
	{
		if(iter->pEntrance && iter->pExit)
		{
			++iter;
			continue;
		}
		else
			iter = teleportOwners.erase(iter);
	}

	// We now have only valid teleporters.
	float shortestDistance = 99999.0f;
	teleport_info_t *bestTP = NULL; 
	float totalDistance;
	for (iter = teleportOwners.begin(); iter != teleportOwners.end(); ++iter)
	{
		// Find the teleporter which results in the shortest path to goal.
    	totalDistance = WaypointDistanceFromTo(pBot->curr_waypoint_index, iter->iEntranceWaypointIndex, team) 
    		+ WaypointDistanceFromTo(iter->iExitWaypointIndex, pBot->goto_wp, team);

		if(totalDistance < shortestDistance)
		{
			shortestDistance = totalDistance;
			bestTP = &(*iter);
		}
	}

	// Got the best saving teleporter, now see if it saves us distance to our goal without taking it.
	if(shortestDistance < WaypointDistanceFromTo(pBot->curr_waypoint_index, pBot->goto_wp, team))
	{
		// Copy this teleporters information into the bot struct.
		bestTP->bIsUsed = true;
		pBot->teleportInfo = *bestTP;
	}

	// Clear the remaining entries.
	teleportOwners.clear();

	if(pBot->teleportInfo.bIsUsed)
	{
		pBot->teleportInfo.iFinalGoal = pBot->goto_wp;
		pBot->goto_wp = pBot->teleportInfo.iEntranceWaypointIndex;
		return true;
	}

	return false;
}