| 1 | /* hash.h -- decls for hash table
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| 2 | Copyright (C) 1995, 1999, 2002 Free Software Foundation, Inc.
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| 3 | Written by Greg McGary <gkm@gnu.org> <greg@mcgary.org>
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| 4 |
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| 5 | This program is free software; you can redistribute it and/or modify
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| 6 | it under the terms of the GNU General Public License as published by
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| 7 | the Free Software Foundation; either version 2, or (at your option)
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| 8 | any later version.
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| 9 |
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| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU General Public License for more details.
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| 14 |
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| 15 | You should have received a copy of the GNU General Public License along with
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| 16 | this program; see the file COPYING. If not, write to the Free Software
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| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. */
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| 18 |
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| 19 | #ifndef _hash_h_
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| 20 | #define _hash_h_
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| 21 |
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| 22 | #include <stdio.h>
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| 23 | #include <ctype.h>
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| 24 |
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| 25 | #if defined __cplusplus || (defined __STDC__ && __STDC__) || defined WINDOWS32
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| 26 | # if !defined __GLIBC__ || !defined __P
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| 27 | # undef __P
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| 28 | # define __P(protos) protos
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| 29 | # endif
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| 30 | #else /* Not C++ or ANSI C. */
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| 31 | # undef __P
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| 32 | # define __P(protos) ()
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| 33 | /* We can get away without defining `const' here only because in this file
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| 34 | it is used only inside the prototype for `fnmatch', which is elided in
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| 35 | non-ANSI C where `const' is problematical. */
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| 36 | #endif /* C++ or ANSI C. */
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| 37 |
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| 38 | typedef unsigned long (*hash_func_t) __P((void const *key));
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| 39 | typedef int (*hash_cmp_func_t) __P((void const *x, void const *y));
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| 40 | typedef void (*hash_map_func_t) __P((void const *item));
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| 41 | typedef void (*hash_map_arg_func_t) __P((void const *item, void *arg));
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| 42 |
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| 43 | struct hash_table
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| 44 | {
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| 45 | void **ht_vec;
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| 46 | unsigned long ht_size; /* total number of slots (power of 2) */
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| 47 | unsigned long ht_capacity; /* usable slots, limited by loading-factor */
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| 48 | unsigned long ht_fill; /* items in table */
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| 49 | unsigned long ht_empty_slots; /* empty slots not including deleted slots */
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| 50 | unsigned long ht_collisions; /* # of failed calls to comparison function */
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| 51 | unsigned long ht_lookups; /* # of queries */
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| 52 | unsigned int ht_rehashes; /* # of times we've expanded table */
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| 53 | hash_func_t ht_hash_1; /* primary hash function */
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| 54 | hash_func_t ht_hash_2; /* secondary hash function */
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| 55 | hash_cmp_func_t ht_compare; /* comparison function */
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| 56 | #ifdef CONFIG_WITH_STRCACHE2
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| 57 | struct strcache2 *ht_strcache; /* the string cache pointer. */
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| 58 | unsigned int ht_off_string; /* offsetof (struct key, string) */
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| 59 | #endif
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| 60 | };
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| 61 |
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| 62 | typedef int (*qsort_cmp_t) __P((void const *, void const *));
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| 63 |
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| 64 | void hash_init __P((struct hash_table *ht, unsigned long size,
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| 65 | hash_func_t hash_1, hash_func_t hash_2, hash_cmp_func_t hash_cmp));
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| 66 | void hash_load __P((struct hash_table *ht, void *item_table,
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| 67 | unsigned long cardinality, unsigned long size));
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| 68 | void **hash_find_slot __P((struct hash_table *ht, void const *key));
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| 69 | void *hash_find_item __P((struct hash_table *ht, void const *key));
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| 70 | void *hash_insert __P((struct hash_table *ht, const void *item));
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| 71 | void *hash_insert_at __P((struct hash_table *ht, const void *item, void const *slot));
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| 72 | void *hash_delete __P((struct hash_table *ht, void const *item));
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| 73 | void *hash_delete_at __P((struct hash_table *ht, void const *slot));
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| 74 | void hash_delete_items __P((struct hash_table *ht));
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| 75 | void hash_free_items __P((struct hash_table *ht));
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| 76 | void hash_free __P((struct hash_table *ht, int free_items));
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| 77 | #ifdef CONFIG_WITH_ALLOC_CACHES
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| 78 | void hash_free_items_cached __P((struct hash_table *ht, struct alloccache *cache));
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| 79 | void hash_free_cached __P((struct hash_table *ht, int free_items, struct alloccache *cache));
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| 80 | #endif
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| 81 | void hash_map __P((struct hash_table *ht, hash_map_func_t map));
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| 82 | void hash_map_arg __P((struct hash_table *ht, hash_map_arg_func_t map, void *arg));
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| 83 | void hash_print_stats __P((struct hash_table *ht, FILE *out_FILE));
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| 84 | void **hash_dump __P((struct hash_table *ht, void **vector_0, qsort_cmp_t compare));
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| 85 |
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| 86 | #ifdef CONFIG_WITH_STRCACHE2
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| 87 | void hash_init_strcached __P((struct hash_table *ht, unsigned long size,
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| 88 | struct strcache2 *strcache, unsigned int off_strptr));
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| 89 | void **hash_find_slot_strcached __P((struct hash_table *ht, const void *key));
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| 90 | void *hash_find_item_strcached __P((struct hash_table *ht, void const *key));
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| 91 | void *hash_insert_strcached __P((struct hash_table *ht, const void *item));
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| 92 | void *hash_delete_strcached __P((struct hash_table *ht, void const *item));
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| 93 | #endif /* CONFIG_WITH_STRCACHE2 */
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| 94 |
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| 95 | extern void *hash_deleted_item;
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| 96 | #define HASH_VACANT(item) ((item) == 0 || (void *) (item) == hash_deleted_item)
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| 97 |
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| 98 | |
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| 99 |
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| 100 | /* hash and comparison macros for case-sensitive string keys. */
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| 101 |
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| 102 | #ifndef CONFIG_WITH_OPTIMIZATION_HACKS
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| 103 | #define STRING_HASH_1(KEY, RESULT) do { \
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| 104 | unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
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| 105 | while (*++_key_) \
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| 106 | (RESULT) += (*_key_ << (_key_[1] & 0xf)); \
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| 107 | } while (0)
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| 108 | #else /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 109 | # define STRING_HASH_1(KEY, RESULT) do { \
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| 110 | unsigned char const *_key_ = (unsigned char const *) (KEY); \
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| 111 | unsigned int _ch_ = *_key_; \
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| 112 | while (_ch_) \
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| 113 | { \
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| 114 | unsigned char _ch2_ = *++_key_; \
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| 115 | (RESULT) += (_ch_ << (_ch2_ & 0xf)); \
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| 116 | _ch_ = _ch2_; \
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| 117 | } \
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| 118 | } while (0)
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| 119 | #endif /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 120 | #define return_STRING_HASH_1(KEY) do { \
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| 121 | unsigned long _result_ = 0; \
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| 122 | STRING_HASH_1 ((KEY), _result_); \
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| 123 | return _result_; \
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| 124 | } while (0)
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| 125 |
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| 126 | #ifndef CONFIG_WITH_OPTIMIZATION_HACKS
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| 127 | #define STRING_HASH_2(KEY, RESULT) do { \
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| 128 | unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
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| 129 | while (*++_key_) \
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| 130 | (RESULT) += (*_key_ << (_key_[1] & 0x7)); \
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| 131 | } while (0)
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| 132 | #else /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 133 | # define STRING_HASH_2(KEY, RESULT) do { \
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| 134 | unsigned char const *_key_ = (unsigned char const *) (KEY); \
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| 135 | unsigned int _ch_ = *_key_; \
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| 136 | while (_ch_) \
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| 137 | { \
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| 138 | unsigned char _ch2_ = *++_key_; \
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| 139 | (RESULT) += (_ch_ << (_ch2_ & 0x7)); \
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| 140 | _ch_ = _ch2_; \
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| 141 | } \
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| 142 | } while (0)
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| 143 | #endif /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 144 | #define return_STRING_HASH_2(KEY) do { \
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| 145 | unsigned long _result_ = 0; \
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| 146 | STRING_HASH_2 ((KEY), _result_); \
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| 147 | return _result_; \
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| 148 | } while (0)
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| 149 |
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| 150 | #define STRING_COMPARE(X, Y, RESULT) do { \
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| 151 | RESULT = strcmp ((X), (Y)); \
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| 152 | } while (0)
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| 153 | #define return_STRING_COMPARE(X, Y) do { \
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| 154 | return strcmp ((X), (Y)); \
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| 155 | } while (0)
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| 156 |
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| 157 | #ifndef CONFIG_WITH_OPTIMIZATION_HACKS
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| 158 | #define STRING_N_HASH_1(KEY, N, RESULT) do { \
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| 159 | unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
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| 160 | int _n_ = (N); \
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| 161 | if (_n_) \
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| 162 | while (--_n_ && *++_key_) \
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| 163 | (RESULT) += (*_key_ << (_key_[1] & 0xf)); \
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| 164 | (RESULT) += *++_key_; \
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| 165 | } while (0)
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| 166 | #else /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 167 | # define STRING_N_HASH_1(KEY, N, RESULT) do { \
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| 168 | unsigned char const *_key_ = (unsigned char const *) (KEY); \
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| 169 | unsigned int _ch_ = *_key_; \
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| 170 | int _n_ = (N); \
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| 171 | if (_n_) \
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| 172 | { \
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| 173 | for (;;) \
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| 174 | { \
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| 175 | unsigned char _ch2_; \
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| 176 | if (!--_n_) \
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| 177 | { \
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| 178 | (RESULT) += _ch_; \
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| 179 | break; \
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| 180 | } \
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| 181 | _ch2_ = *++_key_; \
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| 182 | (RESULT) += (_ch_ << (_ch2_ & 0xf)); \
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| 183 | _ch_ = _ch2_; \
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| 184 | if (!_ch_) break; \
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| 185 | } \
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| 186 | } \
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| 187 | else \
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| 188 | (RESULT) += _ch_; \
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| 189 | } while (0)
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| 190 | #endif /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 191 | #define return_STRING_N_HASH_1(KEY, N) do { \
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| 192 | unsigned long _result_ = 0; \
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| 193 | STRING_N_HASH_1 ((KEY), (N), _result_); \
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| 194 | return _result_; \
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| 195 | } while (0)
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| 196 |
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| 197 | #ifndef CONFIG_WITH_OPTIMIZATION_HACKS
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| 198 | #define STRING_N_HASH_2(KEY, N, RESULT) do { \
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| 199 | unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
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| 200 | int _n_ = (N); \
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| 201 | if (_n_) \
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| 202 | while (--_n_ && *++_key_) \
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| 203 | (RESULT) += (*_key_ << (_key_[1] & 0x7)); \
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| 204 | (RESULT) += *++_key_; \
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| 205 | } while (0)
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| 206 | #else /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 207 | # define STRING_N_HASH_2(KEY, N, RESULT) do { \
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| 208 | unsigned char const *_key_ = (unsigned char const *) (KEY); \
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| 209 | unsigned int _ch_ = *_key_; \
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| 210 | int _n_ = (N); \
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| 211 | if (_n_) \
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| 212 | { \
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| 213 | for (;;) \
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| 214 | { \
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| 215 | unsigned char _ch2_; \
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| 216 | if (!--_n_) \
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| 217 | { \
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| 218 | (RESULT) += _ch_; \
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| 219 | break; \
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| 220 | } \
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| 221 | _ch2_ = *++_key_; \
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| 222 | (RESULT) += (_ch_ << (_ch2_ & 0x7)); \
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| 223 | _ch_ = _ch2_; \
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| 224 | if (!_ch_) break; \
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| 225 | } \
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| 226 | } \
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| 227 | else \
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| 228 | (RESULT) += _ch_; \
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| 229 | } while (0)
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| 230 | #endif /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 231 | #define return_STRING_N_HASH_2(KEY, N) do { \
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| 232 | unsigned long _result_ = 0; \
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| 233 | STRING_N_HASH_2 ((KEY), (N), _result_); \
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| 234 | return _result_; \
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| 235 | } while (0)
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| 236 |
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| 237 | #define STRING_N_COMPARE(X, Y, N, RESULT) do { \
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| 238 | RESULT = strncmp ((X), (Y), (N)); \
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| 239 | } while (0)
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| 240 | #define return_STRING_N_COMPARE(X, Y, N) do { \
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| 241 | return strncmp ((X), (Y), (N)); \
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| 242 | } while (0)
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| 243 |
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| 244 | #ifdef HAVE_CASE_INSENSITIVE_FS
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| 245 |
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| 246 | /* hash and comparison macros for case-insensitive string _key_s. */
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| 247 |
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| 248 | #if 1 /*ndef CONFIG_WITH_OPTIMIZATION_HACKS - testme */
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| 249 | #define ISTRING_HASH_1(KEY, RESULT) do { \
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| 250 | unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
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| 251 | while (*++_key_) \
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| 252 | (RESULT) += ((isupper (*_key_) ? tolower (*_key_) : *_key_) << (_key_[1] & 0xf)); \
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| 253 | } while (0)
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| 254 | #else /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 255 | #define ISTRING_HASH_1(KEY, RESULT) do { \
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| 256 | unsigned char const *_key_ = (unsigned char const *) (KEY); \
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| 257 | unsigned int _ch_ = *_key_;
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| 258 | while (_ch_) \
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| 259 | { \
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| 260 | unsigned _ch2_ = *++_key_; \
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| 261 | (RESULT) += ((isupper (_ch_) ? tolower (_ch_) : _ch_) << (_ch2_ & 0xf)); \
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| 262 | _ch_ = _ch2_; \
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| 263 | } \
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| 264 | } while (0)
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| 265 | #endif /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 266 | #define return_ISTRING_HASH_1(KEY) do { \
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| 267 | unsigned long _result_ = 0; \
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| 268 | ISTRING_HASH_1 ((KEY), _result_); \
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| 269 | return _result_; \
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| 270 | } while (0)
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| 271 |
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| 272 | #if 1 /* ndef CONFIG_WITH_OPTIMIZATION_HACKS - testme */
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| 273 | #define ISTRING_HASH_2(KEY, RESULT) do { \
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| 274 | unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
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| 275 | while (*++_key_) \
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| 276 | (RESULT) += ((isupper (*_key_) ? tolower (*_key_) : *_key_) << (_key_[1] & 0x7)); \
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| 277 | } while (0)
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| 278 | #else /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 279 | #define ISTRING_HASH_2(KEY, RESULT) do { \
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| 280 | unsigned char const *_key_ = (unsigned char const *) (KEY); \
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| 281 | unsigned int _ch_ = *_key_;
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| 282 | while (_ch_) \
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| 283 | { \
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| 284 | unsigned _ch2_ = *++_key_; \
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| 285 | (RESULT) += ((isupper (_ch_) ? tolower (_ch_) : _ch_) << (_ch2_ & 0x7)); \
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| 286 | _ch_ = _ch2_; \
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| 287 | } \
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| 288 | } while (0)
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| 289 | #endif /* CONFIG_WITH_OPTIMIZATION_HACKS */
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| 290 | #define return_ISTRING_HASH_2(KEY) do { \
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| 291 | unsigned long _result_ = 0; \
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| 292 | ISTRING_HASH_2 ((KEY), _result_); \
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| 293 | return _result_; \
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| 294 | } while (0)
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| 295 |
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| 296 | #define ISTRING_COMPARE(X, Y, RESULT) do { \
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| 297 | RESULT = strcasecmp ((X), (Y)); \
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| 298 | } while (0)
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| 299 | #define return_ISTRING_COMPARE(X, Y) do { \
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| 300 | return strcasecmp ((X), (Y)); \
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| 301 | } while (0)
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| 302 |
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| 303 | #else
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| 304 |
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| 305 | #define ISTRING_HASH_1(KEY, RESULT) STRING_HASH_1 ((KEY), (RESULT))
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| 306 | #define return_ISTRING_HASH_1(KEY) return_STRING_HASH_1 (KEY)
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| 307 |
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| 308 | #define ISTRING_HASH_2(KEY, RESULT) STRING_HASH_2 ((KEY), (RESULT))
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| 309 | #define return_ISTRING_HASH_2(KEY) return_STRING_HASH_2 (KEY)
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| 310 |
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| 311 | #define ISTRING_COMPARE(X, Y, RESULT) STRING_COMPARE ((X), (Y), (RESULT))
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| 312 | #define return_ISTRING_COMPARE(X, Y) return_STRING_COMPARE ((X), (Y))
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| 313 |
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| 314 | #endif
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| 315 |
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| 316 | /* hash and comparison macros for integer _key_s. */
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| 317 |
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| 318 | #define INTEGER_HASH_1(KEY, RESULT) do { \
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| 319 | (RESULT) += ((unsigned long)(KEY)); \
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| 320 | } while (0)
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| 321 | #define return_INTEGER_HASH_1(KEY) do { \
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| 322 | unsigned long _result_ = 0; \
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| 323 | INTEGER_HASH_1 ((KEY), _result_); \
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| 324 | return _result_; \
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| 325 | } while (0)
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| 326 |
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| 327 | #define INTEGER_HASH_2(KEY, RESULT) do { \
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| 328 | (RESULT) += ~((unsigned long)(KEY)); \
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| 329 | } while (0)
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| 330 | #define return_INTEGER_HASH_2(KEY) do { \
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| 331 | unsigned long _result_ = 0; \
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| 332 | INTEGER_HASH_2 ((KEY), _result_); \
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| 333 | return _result_; \
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| 334 | } while (0)
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| 335 |
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| 336 | #define INTEGER_COMPARE(X, Y, RESULT) do { \
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| 337 | (RESULT) = X - Y; \
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| 338 | } while (0)
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| 339 | #define return_INTEGER_COMPARE(X, Y) do { \
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| 340 | int _result_; \
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| 341 | INTEGER_COMPARE (X, Y, _result_); \
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| 342 | return _result_; \
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| 343 | } while (0)
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| 344 |
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| 345 | /* hash and comparison macros for address keys. */
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| 346 |
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| 347 | #define ADDRESS_HASH_1(KEY, RESULT) INTEGER_HASH_1 (((unsigned long)(KEY)) >> 3, (RESULT))
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| 348 | #define ADDRESS_HASH_2(KEY, RESULT) INTEGER_HASH_2 (((unsigned long)(KEY)) >> 3, (RESULT))
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| 349 | #define ADDRESS_COMPARE(X, Y, RESULT) INTEGER_COMPARE ((X), (Y), (RESULT))
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| 350 | #define return_ADDRESS_HASH_1(KEY) return_INTEGER_HASH_1 (((unsigned long)(KEY)) >> 3)
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| 351 | #define return_ADDRESS_HASH_2(KEY) return_INTEGER_HASH_2 (((unsigned long)(KEY)) >> 3)
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| 352 | #define return_ADDRESS_COMPARE(X, Y) return_INTEGER_COMPARE ((X), (Y))
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| 353 |
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| 354 | #endif /* not _hash_h_ */
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