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/* hashlib.h -- the data structures used in hashing in Bash. */
/* Copyright (C) 1993-2009 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash 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 3 of the License, or
(at your option) any later version.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#if !defined (_HASHLIB_H_)
#define _HASHLIB_H_
#include "stdc.h"
#ifndef PTR_T
# ifdef __STDC__
# define PTR_T void *
# else
# define PTR_T char *
# endif
#endif
typedef struct bucket_contents {
struct bucket_contents *next; /* Link to next hashed key in this bucket. */
char *key; /* What we look up. */
PTR_T data; /* What we really want. */
unsigned int khash; /* What key hashes to */
int times_found; /* Number of times this item has been found. */
} BUCKET_CONTENTS;
typedef struct hash_table {
BUCKET_CONTENTS **bucket_array; /* Where the data is kept. */
int nbuckets; /* How many buckets does this table have. */
int nentries; /* How many entries does this table have. */
} HASH_TABLE;
typedef int hash_wfunc __P((BUCKET_CONTENTS *));
/* Operations on tables as a whole */
extern HASH_TABLE *hash_create __P((int));
extern HASH_TABLE *hash_copy __P((HASH_TABLE *, sh_string_func_t *));
extern void hash_flush __P((HASH_TABLE *, sh_free_func_t *));
extern void hash_dispose __P((HASH_TABLE *));
extern void hash_walk __P((HASH_TABLE *, hash_wfunc *));
/* Operations to extract information from or pieces of tables */
extern int hash_bucket __P((const char *, HASH_TABLE *));
extern int hash_size __P((HASH_TABLE *));
/* Operations on hash table entries */
extern BUCKET_CONTENTS *hash_search __P((const char *, HASH_TABLE *, int));
extern BUCKET_CONTENTS *hash_insert __P((char *, HASH_TABLE *, int));
extern BUCKET_CONTENTS *hash_remove __P((const char *, HASH_TABLE *, int));
/* Miscellaneous */
extern unsigned int hash_string __P((const char *));
/* Redefine the function as a macro for speed. */
#define hash_items(bucket, table) \
((table && (bucket < table->nbuckets)) ? \
table->bucket_array[bucket] : \
(BUCKET_CONTENTS *)NULL)
/* Default number of buckets in the hash table. */
#define DEFAULT_HASH_BUCKETS 128 /* must be power of two */
#define HASH_ENTRIES(ht) ((ht) ? (ht)->nentries : 0)
/* flags for hash_search and hash_insert */
#define HASH_NOSRCH 0x01
#define HASH_CREATE 0x02
#if !defined (NULL)
# if defined (__STDC__)
# define NULL ((void *) 0)
# else
# define NULL 0x0
# endif /* !__STDC__ */
#endif /* !NULL */
#endif /* _HASHLIB_H */
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