mirror of https://github.com/n-hys/bash.git
64 lines
2.1 KiB
C
64 lines
2.1 KiB
C
/* hashlib.h -- the data structures used in hashing in Bash. */
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/* Copyright (C) 1993 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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Bash is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License along
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with Bash; see the file COPYING. If not, write to the Free Software
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Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#if !defined (_HASHLIB_H_)
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#define _HASHLIB_H_
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typedef struct bucket_contents {
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struct bucket_contents *next; /* Link to next hashed key in this bucket. */
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char *key; /* What we look up. */
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char *data; /* What we really want. */
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int times_found; /* Number of times this item has been found. */
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} BUCKET_CONTENTS;
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typedef struct hash_table {
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BUCKET_CONTENTS **bucket_array; /* Where the data is kept. */
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int nbuckets; /* How many buckets does this table have. */
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int nentries; /* How many entries does this table have. */
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} HASH_TABLE;
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extern int hash_string ();
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extern HASH_TABLE *make_hash_table ();
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extern BUCKET_CONTENTS *find_hash_item ();
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extern BUCKET_CONTENTS *remove_hash_item ();
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extern BUCKET_CONTENTS *add_hash_item ();
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extern BUCKET_CONTENTS *get_hash_bucket ();
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extern void flush_hash_table ();
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extern void dispose_hash_table ();
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/* Redefine the function as a macro for speed. */
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#define get_hash_bucket(bucket, table) \
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((table && (bucket < table->nbuckets)) ? \
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table->bucket_array[bucket] : \
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(BUCKET_CONTENTS *)NULL)
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/* Default number of buckets in the hash table. */
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#define DEFAULT_HASH_BUCKETS 53 /* was 107 */
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#if !defined (NULL)
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# if defined (__STDC__)
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# define NULL ((void *) 0)
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# else
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# define NULL 0x0
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# endif /* !__STDC__ */
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#endif /* !NULL */
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#endif /* _HASHLIB_H */
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