hash.h

   1 /* hash.h -- decls for hash table
   2    Copyright (C) 1995, 1999, 2002 Free Software Foundation, Inc.
   3    Written by Greg McGary <gkm@gnu.org> <greg@mcgary.org>
   4
   5    This program is free software; you can redistribute it and/or modify
   6    it under the terms of the GNU General Public License as published by
   7    the Free Software Foundation; either version 2, or (at your option)
   8    any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to the Free Software
  17    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
  18
  19 #ifndef _hash_h_
  20 #define _hash_h_
  21
  22 #include <stdio.h>
  23 #include <ctype.h>
  24
  25 #if defined __cplusplus || (defined __STDC__ && __STDC__) || defined WINDOWS32
  26 # if !defined __GLIBC__ || !defined __P
  27 #  undef        __P
  28 #  define __P(protos)   protos
  29 # endif
  30 #else /* Not C++ or ANSI C.  */
  31 # undef __P
  32 # define __P(protos)    ()
  33 /* We can get away without defining `const' here only because in this file
  34    it is used only inside the prototype for `fnmatch', which is elided in
  35    non-ANSI C where `const' is problematical.  */
  36 #endif /* C++ or ANSI C.  */
  37
  38 typedef unsigned long (*hash_func_t) __P((void const *key));
  39 typedef int (*hash_cmp_func_t) __P((void const *x, void const *y));
  40 typedef void (*hash_map_func_t) __P((void const *item));
  41 typedef void (*hash_map_arg_func_t) __P((void const *item, void *arg));
  42
  43 struct hash_table
  44 {
  45   void **ht_vec;
  46   unsigned long ht_size;        /* total number of slots (power of 2) */
  47   unsigned long ht_capacity;    /* usable slots, limited by loading-factor */
  48   unsigned long ht_fill;        /* items in table */
  49   unsigned long ht_empty_slots; /* empty slots not including deleted slots */
  50   unsigned long ht_collisions;  /* # of failed calls to comparison function */
  51   unsigned long ht_lookups;     /* # of queries */
  52   unsigned int ht_rehashes;     /* # of times we've expanded table */
  53   hash_func_t ht_hash_1;        /* primary hash function */
  54   hash_func_t ht_hash_2;        /* secondary hash function */
  55   hash_cmp_func_t ht_compare;   /* comparison function */
  56 };
  57
  58 typedef int (*qsort_cmp_t) __P((void const *, void const *));
  59
  60 void hash_init __P((struct hash_table *ht, unsigned long size,
  61                     hash_func_t hash_1, hash_func_t hash_2, hash_cmp_func_t hash_cmp));
  62 void hash_load __P((struct hash_table *ht, void *item_table,
  63                     unsigned long cardinality, unsigned long size));
  64 void **hash_find_slot __P((struct hash_table *ht, void const *key));
  65 void *hash_find_item __P((struct hash_table *ht, void const *key));
  66 void *hash_insert __P((struct hash_table *ht, void *item));
  67 void *hash_insert_at __P((struct hash_table *ht, void *item, void const *slot));
  68 void *hash_delete __P((struct hash_table *ht, void const *item));
  69 void *hash_delete_at __P((struct hash_table *ht, void const *slot));
  70 void hash_delete_items __P((struct hash_table *ht));
  71 void hash_free_items __P((struct hash_table *ht));
  72 void hash_free __P((struct hash_table *ht, int free_items));
  73 void hash_map __P((struct hash_table *ht, hash_map_func_t map));
  74 void hash_map_arg __P((struct hash_table *ht, hash_map_arg_func_t map, void *arg));
  75 void hash_print_stats __P((struct hash_table *ht, FILE *out_FILE));
  76 void **hash_dump __P((struct hash_table *ht, void **vector_0, qsort_cmp_t compare));
  77
  78 extern void *hash_deleted_item;
  79 #define HASH_VACANT(item) ((item) == 0 || (void *) (item) == hash_deleted_item)
  80
  81 \f
  82 /* hash and comparison macros for case-sensitive string keys. */
  83
  84 #define STRING_HASH_1(KEY, RESULT) do { \
  85   unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
  86   while (*++_key_) \
  87     (RESULT) += (*_key_ << (_key_[1] & 0xf)); \
  88 } while (0)
  89 #define return_STRING_HASH_1(KEY) do { \
  90   unsigned long _result_ = 0; \
  91   STRING_HASH_1 ((KEY), _result_); \
  92   return _result_; \
  93 } while (0)
  94
  95 #define STRING_HASH_2(KEY, RESULT) do { \
  96   unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
  97   while (*++_key_) \
  98     (RESULT) += (*_key_ << (_key_[1] & 0x7)); \
  99 } while (0)
 100 #define return_STRING_HASH_2(KEY) do { \
 101   unsigned long _result_ = 0; \
 102   STRING_HASH_2 ((KEY), _result_); \
 103   return _result_; \
 104 } while (0)
 105
 106 #define STRING_COMPARE(X, Y, RESULT) do { \
 107   RESULT = strcmp ((X), (Y)); \
 108 } while (0)
 109 #define return_STRING_COMPARE(X, Y) do { \
 110   return strcmp ((X), (Y)); \
 111 } while (0)
 112
 113
 114 #define STRING_N_HASH_1(KEY, N, RESULT) do { \
 115   unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
 116   int _n_ = (N); \
 117   if (_n_) \
 118     while (--_n_ && *++_key_) \
 119       (RESULT) += (*_key_ << (_key_[1] & 0xf)); \
 120   (RESULT) += *++_key_; \
 121 } while (0)
 122 #define return_STRING_N_HASH_1(KEY, N) do { \
 123   unsigned long _result_ = 0; \
 124   STRING_N_HASH_1 ((KEY), (N), _result_); \
 125   return _result_; \
 126 } while (0)
 127
 128 #define STRING_N_HASH_2(KEY, N, RESULT) do { \
 129   unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
 130   int _n_ = (N); \
 131   if (_n_) \
 132     while (--_n_ && *++_key_) \
 133       (RESULT) += (*_key_ << (_key_[1] & 0x7)); \
 134   (RESULT) += *++_key_; \
 135 } while (0)
 136 #define return_STRING_N_HASH_2(KEY, N) do { \
 137   unsigned long _result_ = 0; \
 138   STRING_N_HASH_2 ((KEY), (N), _result_); \
 139   return _result_; \
 140 } while (0)
 141
 142 #define STRING_N_COMPARE(X, Y, N, RESULT) do { \
 143   RESULT = strncmp ((X), (Y), (N)); \
 144 } while (0)
 145 #define return_STRING_N_COMPARE(X, Y, N) do { \
 146   return strncmp ((X), (Y), (N)); \
 147 } while (0)
 148
 149 #ifdef HAVE_CASE_INSENSITIVE_FS
 150
 151 /* hash and comparison macros for case-insensitive string _key_s. */
 152
 153 #define ISTRING_HASH_1(KEY, RESULT) do { \
 154   unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
 155   while (*++_key_) \
 156     (RESULT) += ((isupper (*_key_) ? tolower (*_key_) : *_key_) << (_key_[1] & 0xf)); \
 157 } while (0)
 158 #define return_ISTRING_HASH_1(KEY) do { \
 159   unsigned long _result_ = 0; \
 160   ISTRING_HASH_1 ((KEY), _result_); \
 161   return _result_; \
 162 } while (0)
 163
 164 #define ISTRING_HASH_2(KEY, RESULT) do { \
 165   unsigned char const *_key_ = (unsigned char const *) (KEY) - 1; \
 166   while (*++_key_) \
 167     (RESULT) += ((isupper (*_key_) ? tolower (*_key_) : *_key_) << (_key_[1] & 0x7)); \
 168 } while (0)
 169 #define return_ISTRING_HASH_2(KEY) do { \
 170   unsigned long _result_ = 0; \
 171   ISTRING_HASH_2 ((KEY), _result_); \
 172   return _result_; \
 173 } while (0)
 174
 175 #define ISTRING_COMPARE(X, Y, RESULT) do { \
 176   RESULT = strcmpi ((X), (Y)); \
 177 } while (0)
 178 #define return_ISTRING_COMPARE(X, Y) do { \
 179   return strcmpi ((X), (Y)); \
 180 } while (0)
 181
 182 #else
 183
 184 #define ISTRING_HASH_1(KEY, RESULT) STRING_HASH_1 ((KEY), (RESULT))
 185 #define return_ISTRING_HASH_1(KEY) return_STRING_HASH_1 (KEY)
 186
 187 #define ISTRING_HASH_2(KEY, RESULT) STRING_HASH_2 ((KEY), (RESULT))
 188 #define return_ISTRING_HASH_2(KEY) return_STRING_HASH_2 (KEY)
 189
 190 #define ISTRING_COMPARE(X, Y, RESULT) STRING_COMPARE ((X), (Y), (RESULT))
 191 #define return_ISTRING_COMPARE(X, Y) return_STRING_COMPARE ((X), (Y))
 192
 193 #endif
 194
 195 /* hash and comparison macros for integer _key_s. */
 196
 197 #define INTEGER_HASH_1(KEY, RESULT) do { \
 198   (RESULT) += ((unsigned long)(KEY)); \
 199 } while (0)
 200 #define return_INTEGER_HASH_1(KEY) do { \
 201   unsigned long _result_ = 0; \
 202   INTEGER_HASH_1 ((KEY), _result_); \
 203   return _result_; \
 204 } while (0)
 205
 206 #define INTEGER_HASH_2(KEY, RESULT) do { \
 207   (RESULT) += ~((unsigned long)(KEY)); \
 208 } while (0)
 209 #define return_INTEGER_HASH_2(KEY) do { \
 210   unsigned long _result_ = 0; \
 211   INTEGER_HASH_2 ((KEY), _result_); \
 212   return _result_; \
 213 } while (0)
 214
 215 #define INTEGER_COMPARE(X, Y, RESULT) do { \
 216   (RESULT) = X - Y; \
 217 } while (0)
 218 #define return_INTEGER_COMPARE(X, Y) do { \
 219   int _result_; \
 220   INTEGER_COMPARE (X, Y, _result_); \
 221   return _result_; \
 222 } while (0)
 223
 224 /* hash and comparison macros for address keys. */
 225
 226 #define ADDRESS_HASH_1(KEY, RESULT) INTEGER_HASH_1 (((unsigned long)(KEY)) >> 3, (RESULT))
 227 #define ADDRESS_HASH_2(KEY, RESULT) INTEGER_HASH_2 (((unsigned long)(KEY)) >> 3, (RESULT))
 228 #define ADDRESS_COMPARE(X, Y, RESULT) INTEGER_COMPARE ((X), (Y), (RESULT))
 229 #define return_ADDRESS_HASH_1(KEY) return_INTEGER_HASH_1 (((unsigned long)(KEY)) >> 3)
 230 #define return_ADDRESS_HASH_2(KEY) return_INTEGER_HASH_2 (((unsigned long)(KEY)) >> 3)
 231 #define return_ADDRESS_COMPARE(X, Y) return_INTEGER_COMPARE ((X), (Y))
 232
 233 #endif /* not _hash_h_ */