/*-
 * Written by J.T. Conklin <jtc@NetBSD.org>
 * Public domain.
 *
 *	$NetBSD: search.h,v 1.16 2005/02/03 04:39:32 perry Exp $
 * $FreeBSD: releng/12.4/include/search.h 307227 2016-10-13 18:25:40Z ed $
 */

#ifndef _SEARCH_H_
#define _SEARCH_H_

#include <sys/cdefs.h>
#include <sys/_types.h>

#ifndef _SIZE_T_DECLARED
typedef	__size_t	size_t;
#define	_SIZE_T_DECLARED
#endif

typedef	struct entry {
	char	*key;
	void	*data;
} ENTRY;

typedef	enum {
	FIND, ENTER
} ACTION;

typedef	enum {
	preorder,
	postorder,
	endorder,
	leaf
} VISIT;

#ifdef _SEARCH_PRIVATE
typedef struct __posix_tnode {
	void			*key;
	struct __posix_tnode	*llink, *rlink;
	signed char		 balance;
} posix_tnode;

struct que_elem {
	struct que_elem *next;
	struct que_elem *prev;
};
#else
typedef void posix_tnode;
#endif

#if __BSD_VISIBLE
struct hsearch_data {
	struct __hsearch *__hsearch;
};
#endif

__BEGIN_DECLS
int	 hcreate(size_t);
void	 hdestroy(void);
ENTRY	*hsearch(ENTRY, ACTION);
void	 insque(void *, void *);
void	*lfind(const void *, const void *, size_t *, size_t,
	    int (*)(const void *, const void *));
void	*lsearch(const void *, void *, size_t *, size_t,
	    int (*)(const void *, const void *));
void	 remque(void *);
void	*tdelete(const void * __restrict, posix_tnode ** __restrict,
	    int (*)(const void *, const void *));
posix_tnode *
	 tfind(const void *, posix_tnode * const *,
	    int (*)(const void *, const void *));
posix_tnode *
	 tsearch(const void *, posix_tnode **,
	    int (*)(const void *, const void *));
void	 twalk(const posix_tnode *, void (*)(const posix_tnode *, VISIT, int));

#if __BSD_VISIBLE
int	 hcreate_r(size_t, struct hsearch_data *);
void	 hdestroy_r(struct hsearch_data *);
int	 hsearch_r(ENTRY, ACTION, ENTRY **, struct hsearch_data *);
#endif

__END_DECLS

#endif /* !_SEARCH_H_ */
