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/* hashlib.h -- the data structures used in hashing in Bash. */
/* Copyright (C) 1993 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 2, 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; see the file COPYING. If not, write to the Free Software
Foundation, 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#if !defined (_HASHLIB_H_)
#define _HASHLIB_H_
#include "stdc.h"
typedef struct bucket_contents {
struct bucket_contents *next; /* Link to next hashed key in this bucket. */
char *key; /* What we look up. */
char *data; /* What we really want. */
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;
extern int hash_string __P((char *, HASH_TABLE *));
extern HASH_TABLE *make_hash_table __P((int));
extern BUCKET_CONTENTS *find_hash_item __P((char *, HASH_TABLE *));
extern BUCKET_CONTENTS *remove_hash_item __P((char *, HASH_TABLE *));
extern BUCKET_CONTENTS *add_hash_item __P((char *, HASH_TABLE *));
extern void flush_hash_table __P((HASH_TABLE *, VFunction *));
extern void dispose_hash_table __P((HASH_TABLE *));
/* Redefine the function as a macro for speed. */
#define get_hash_bucket(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 53 /* was 107 */
#define HASH_ENTRIES(ht) (ht)->nentries
#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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