hashtable.h

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/*
 * Copyright (C) 2000  Ross Combs ([e-mail])
 *
 * 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.
 */
#ifndef INCLUDED_HASHTABLE_TYPES
#define INCLUDED_HASHTABLE_TYPES

#ifdef HASHTABLE_INTERNAL_ACCESS
struct hashtable; /* forward reference for t_entry */
#endif

#ifdef HASHTABLE_INTERNAL_ACCESS
typedef struct internentry
{
    void *               data;
    struct internentry * next;
}
t_internentry;
#endif

typedef struct entry
#ifdef HASHTABLE_INTERNAL_ACCESS
{
    unsigned int             row;
    t_internentry *          real;
    struct hashtable const * hashtable;
}
#endif
t_entry;

typedef struct hashtable
#ifdef HASHTABLE_INTERNAL_ACCESS
{
    unsigned int      num_rows;
    unsigned int      len;
    unsigned int      zombies;
    t_internentry * * rows;
}
#endif
t_hashtable;

#endif


/*****/
#ifndef JUST_NEED_TYPES
#ifndef INCLUDED_HASHTABLE_PROTOS
#define INCLUDED_HASHTABLE_PROTOS

extern t_hashtable * hashtable_create(unsigned int num_rows) ;
extern int hashtable_destroy(t_hashtable * hashtable);
extern int hashtable_purge(t_hashtable * hashtable);
extern int hashtable_check(t_hashtable const * hashtable);
extern unsigned int hashtable_get_length(t_hashtable const * hashtable);
extern int hashtable_insert_data(t_hashtable * hashtable, void * data, unsigned int hash);
extern t_entry * hashtable_get_entry_by_data(t_hashtable const * hashtable, void const * data, unsigned int hash);
extern t_entry const * hashtable_get_entry_by_data_const(t_hashtable const * hashtable, void const * data, unsigned int hash);
extern int hashtable_remove_data(t_hashtable * hashtable, void const * data, unsigned int hash); /* delete matching item */
extern int hashtable_remove_entry(t_hashtable * hashtable, t_entry * entry);
extern void * hashtable_get_data_by_pos(t_hashtable const * hashtable, unsigned int pos);
extern void * entry_get_data(t_entry const * entry);
#ifdef HASHTABLE_DEBUG
extern t_entry * hashtable_match_get_first_real(t_hashtable const * hashtable, unsigned int hash, char const * fn, unsigned int ln);
# define hashtable_match_get_first(L,H) hashtable_match_get_first_real(L,H,__FILE__,__LINE__)
#else
extern t_entry * hashtable_match_get_first(t_hashtable const * hashtable, unsigned int hash);
#endif
extern t_entry * entry_match_get_next(t_entry const * entry, unsigned int hash);
#ifdef HASHTABLE_DEBUG
extern t_entry * hashtable_get_first_real(t_hashtable const * hashtable, char const * fn, unsigned int ln);
# define hashtable_get_first(L) hashtable_get_first_real(L,__FILE__,__LINE__)
#else
extern t_entry * hashtable_get_first(t_hashtable const * hashtable);
#endif
extern t_entry * entry_get_next(t_entry * entry);
#ifdef HASHTABLE_DEBUG
extern t_entry * hashtable_get_first_matching_real(t_hashtable const * hashtable, unsigned int hash, char const * fn, unsigned int ln);
# define hashtable_get_first_matching(L,H) hashtable_get_first_matching_real(L,H,__FILE__,__LINE__)
#else
extern t_entry * hashtable_get_first_matching(t_hashtable const * hashtable, unsigned int hash);
#endif
extern t_entry * entry_get_next_matching(t_entry * entry);
extern int hashtable_entry_release(t_entry * entry);
extern int hashtable_stats(t_hashtable * hashtable);

#define HASHTABLE_TRAVERSE(hashtable,curr) for (curr=hashtable_get_first(hashtable); curr; curr=entry_get_next(curr))
#define HASHTABLE_TRAVERSE_MATCHING(hashtable,curr,hash) for (curr=hashtable_get_first_matching(hashtable,hash); curr; curr=entry_get_next_matching(curr))

#endif
#endif