/*
    Functions to manage the format_specific_data chain
   
    Copyright (C) 2005 Ron Parker and Robert Lipe.

    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 USA

 */

#include <stddef.h>
#include <stdio.h>
#include <string.h>

#include "defs.h"

format_specific_data *fs_chain_copy( format_specific_data *source ) {
	format_specific_data *result = NULL;
	
	format_specific_data **copy = &result;
	while ( source ) {
		source->copy( (void **)copy, (void *)source );
		/* prevent segfaults from badly-behaved copy functions */
		(*copy)->next = NULL; 
		copy = &((*copy)->next);
		source = source->next;
	} 
	return result;
}

void fs_chain_destroy( format_specific_data *chain ) {
	format_specific_data *cur = chain;
	format_specific_data *next = NULL;
	while ( cur ) {
		next = cur->next;
		cur->destroy( cur );
		cur = next;
	}
}

format_specific_data *fs_chain_find( format_specific_data *chain, long type ) {
	format_specific_data *cur = chain;
	while ( cur ) {
		if (cur->type == type ) {
			return cur;
		}
		cur = cur->next;
	}
	return NULL;
}

void fs_chain_add( format_specific_data **chain, format_specific_data *data ) {
	data->next = *chain;
	*chain = data;
}