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1 /* This file is part of XEmacs.
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2
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3 XEmacs is free software; you can redistribute it and/or modify it
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4 under the terms of the GNU General Public License as published by the
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5 Free Software Foundation; either version 2, or (at your option) any
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6 later version.
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7
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8 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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9 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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10 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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11 for more details.
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12
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13 You should have received a copy of the GNU General Public License
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14 along with XEmacs; see the file COPYING. If not, write to
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15 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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16 Boston, MA 02111-1307, USA. */
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17
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18 /* Synched up with: Not in FSF. */
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19
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20 #ifndef _HASH_H_
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21 #define _HASH_H_
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22
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23 typedef struct
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24 {
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25 CONST void *key;
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26 void *contents;
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27 } hentry;
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28
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29 typedef int (*hash_table_test_function) (CONST void *, CONST void *);
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30 typedef unsigned long (*hash_table_hash_function) (CONST void *);
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31 typedef size_t hash_size_t;
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32
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33 struct hash_table
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34 {
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35 hentry *harray;
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36 long zero_set;
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37 void *zero_entry;
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38 hash_size_t size; /* size of the hasharray */
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39 hash_size_t fullness; /* number of entries in the hash table */
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40 hash_table_hash_function hash_function;
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41 hash_table_test_function test_function;
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42 };
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43
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44 /* SIZE is the number of initial entries. The hash table will be grown
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45 automatically if the number of entries approaches the size */
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46 struct hash_table *make_hash_table (hash_size_t size);
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47
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48 struct hash_table *
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49 make_general_hash_table (hash_size_t size,
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50 hash_table_hash_function hash_function,
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51 hash_table_test_function test_function);
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52
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53 /* Clear HASH-TABLE. A freshly created hash table is already cleared up. */
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54 void clrhash (struct hash_table *hash_table);
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55
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56 /* Free HASH-TABLE and its substructures */
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57 void free_hash_table (struct hash_table *hash_table);
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58
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59 /* Returns a hentry whose key is 0 if the entry does not exist in HASH-TABLE */
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60 CONST void *gethash (CONST void *key, struct hash_table *hash_table,
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61 CONST void **ret_value);
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62
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63 /* KEY should be different from 0 */
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64 void puthash (CONST void *key, void *contents, struct hash_table *hash_table);
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65
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66 /* delete the entry with key KEY */
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67 void remhash (CONST void *key, struct hash_table *hash_table);
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68
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69 typedef int (*maphash_function) (CONST void* key, void* contents, void* arg);
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70
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71 typedef int (*remhash_predicate) (CONST void* key, CONST void* contents,
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72 void* arg);
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73
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74 /* Call MF (key, contents, arg) for every entry in HASH-TABLE */
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75 void maphash (maphash_function mf, struct hash_table *hash_table, void* arg);
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76
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77 /* Delete all objects from HASH-TABLE satisfying PREDICATE */
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78 void map_remhash (remhash_predicate predicate,
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79 struct hash_table *hash_table, void *arg);
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80
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81 #endif /* _HASH_H_ */
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