/*
   dict.h - dictionary functions
   This file is part of the nss-ldapd library.

   Copyright (C) 2007, 2008 Arthur de Jong

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   This library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301 USA
*/

#ifndef _DICT_H
#define _DICT_H

#include "compat/attrs.h"

/*
   These functions provide a mapping between a case insensitive
   string and a pointer.
*/
typedef struct dictionary DICT;

/* Create a new instance of a dictionary. Returns NULL
   in case of memory allocation errors. */
DICT *dict_new(void)
  LIKE_MALLOC MUST_USE;

/* Add a relation in the dictionary. The key is duplicated
   and can be reused by the caller. The pointer is just stored.
   This function returns non-0 in case of memory allocation
   errors. If the key was previously in use the value
   is replaced. All key comparisons are case insensitive. */
int dict_put(DICT *dict,const char *key,void *value);

/* Look up a key in the dictionary and return the associated
   value. NULL is returned if the key is not found in the dictionary.
   All key comparisons are case insensitive. */
void *dict_get(DICT *dict,const char *key)
  MUST_USE;

/* Delete a key-value association from the dictionary.
   All key comparisons are case insensitive. */
/*void dict_del(DICT *dict,const char *key);*/

/* Remove the dictionary from memory. All allocated storage
   for the dictionary and the keys is freed.
   Note that values are not freed. This is the responsibility
   of the caller. */
void dict_free(DICT *dict);

/* Function for looping over all dictionary keys and values.
   This resets the search to the beginning of the dictionary.
   This is required before calling dict_loop_next(); */
void dict_loop_first(DICT *dict);

/* Function for looping over all dictionary keys and values.
   This returns a stored key. NULL is returned when all
   keys have been returned. The key and value are
   stored in the key and value parameters if they aren't
   NULL. */
const char *dict_loop_next(DICT *dict,const char **key,void **value)
  MUST_USE;

#endif /* _DICT_H */