/*
 * Copyright 1993, 1995 Christopher Seiwald.
 *
 * This file is part of Jam - see jam.c for Copyright information.
 */

/*  This file is ALSO:
 *  (C) Copyright David Abrahams 2001. Permission to copy, use,
 *  modify, sell and distribute this software is granted provided this
 *  copyright notice appears in all copies. This software is provided
 *  "as is" without express or implied warranty, and with no claim as
 *  to its suitability for any purpose.
 */

/*
 * lists.h - the LIST structure and routines to manipulate them
 *
 * The whole of jam relies on lists of strings as a datatype.  This
 * module, in conjunction with newstr.c, handles these relatively
 * efficiently.
 *
 * Structures defined:
 *
 *	LIST - list of strings
 *	LOL - list of LISTs
 *
 * External routines:
 *
 *	list_append() - append a list onto another one, returning total
 *	list_new() - tack a string onto the end of a list of strings
 * 	list_copy() - copy a whole list of strings
 *	list_sublist() - copy a subset of a list of strings
 *	list_free() - free a list of strings
 *	list_print() - print a list of strings to stdout
 *	list_length() - return the number of items in the list
 *
 *	lol_init() - initialize a LOL (list of lists)
 *	lol_add() - append a LIST onto an LOL
 *	lol_free() - free the LOL and its LISTs
 *	lol_get() - return one of the LISTs in the LOL
 *	lol_print() - debug print LISTS separated by ":"
 *
 * 04/13/94 (seiwald) - added shorthand L0 for null list pointer
 * 08/23/94 (seiwald) - new list_append()
 */

#ifndef LISTS_DWA20011022_H
# define LISTS_DWA20011022_H

/*
 * LIST - list of strings
 */

typedef struct _list LIST;

struct _list {
	LIST	*next;
	LIST	*tail;		/* only valid in head node */
	char	*string;	/* private copy */
} ;

/*
 * LOL - list of LISTs
 */

typedef struct _lol LOL;

# define LOL_MAX 9

struct _lol {
	int	count;
	LIST	*list[ LOL_MAX ];
} ;

LIST *	list_append( LIST *l, LIST *nl );
LIST *	list_copy( LIST *l, LIST  *nl );
void	list_free( LIST *head );
LIST *	list_new( LIST *head, char *string );
void	list_print( LIST *l );
int	list_length( LIST *l );
LIST *	list_sublist( LIST *l, int start, int count );
LIST *  list_pop_front( LIST *l );

# define list_next( l ) ((l)->next)

# define L0 ((LIST *)0)

void	lol_add( LOL *lol, LIST *l );
void	lol_init( LOL *lol );
void	lol_free( LOL *lol );
LIST *	lol_get( LOL *lol, int i );
void	lol_print( LOL *lol );

#endif

