mirror of
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470 lines
25 KiB
C
470 lines
25 KiB
C
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/*
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* C-Ware License
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*
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* Copyright (c) 2022, C-Ware
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Redistributions of modified source code must append a copyright notice in
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* the form of 'Copyright <YEAR> <NAME>' to each modified source file's
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* copyright notice, and the standalone license file if one exists.
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*
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* A "redistribution" can be constituted as any version of the source code
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* that is intended to comprise some other derivative work of this code. A
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* fork created for the purpose of contributing to any version of the source
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* does not constitute a truly "derivative work" and does not require listing.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef CWARE_LIBCHASH_H
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#define CWARE_LIBCHASH_H
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#define CWARE_LIBCHASH_VERSION "2.0.0"
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/* How big heap-allocated hashtables are by default */
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#ifndef CHASH_INITIAL_SIZE
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#define CHASH_INITIAL_SIZE 10
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#elif CHASH_INITIAL_SIZE <= 0
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"chash_init: default length must be greater than 0"
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#endif
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/* Calculates the next size of the hashtable. */
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#ifndef CHASH_RESIZE
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#define CHASH_RESIZE(size) \
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((size) * 1.3)
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#endif
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/* The threshold that, when passed, will cause a resize */
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#ifndef CHASH_LOAD_THRESHOLD
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#define CHASH_LOAD_THRESHOLD 0.8
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#endif
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/* The type that is used for counters; useful for aligning hashtable
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* length and capacity fields so type casting warnings do not appear */
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#ifndef CHASH_COUNTER_TYPE
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#define CHASH_COUNTER_TYPE int
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#endif
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/* The name of the key field */
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#ifndef CHASH_KEY_FIELD
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#define CHASH_KEY_FIELD key
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#endif
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/* The name of the value field */
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#ifndef CHASH_VALUE_FIELD
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#define CHASH_VALUE_FIELD value
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#endif
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/* The name of the state field */
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#ifndef CHASH_STATE_FIELD
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#define CHASH_STATE_FIELD state
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#endif
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/* The name of the buckets field */
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#ifndef CHASH_BUCKETS_FIELD
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#define CHASH_BUCKETS_FIELD buckets
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#endif
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/* The name of the length field */
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#ifndef CHASH_LENGTH_FIELD
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#define CHASH_LENGTH_FIELD length
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#endif
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/* The name of the capacity field */
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#ifndef CHASH_CAPACITY_FIELD
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#define CHASH_CAPACITY_FIELD capacity
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#endif
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/* State enums */
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#define CHASH_UNFILLED 0
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#define CHASH_FILLED 1
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#define CHASH_TOMBSTONE 2
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/* Built-ins */
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#define chash_string_hash(key, hash) \
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5031; \
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do { \
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int __CHASH_HINDEX = 0; \
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\
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for(__CHASH_HINDEX = 0; (key)[__CHASH_HINDEX] != '\0'; \
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__CHASH_HINDEX++) { \
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(hash) = (((hash) << 1) + (hash)) + (key)[__CHASH_HINDEX]; \
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} \
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} while(0)
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#define chash_string_compare(cmp_a, cmp_b) \
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(strcmp((cmp_a), (cmp_b)) == 0)
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#define chash_default_init(bucket, _key, _value) \
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(bucket).CHASH_KEY_FIELD = (_key); \
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(bucket).CHASH_VALUE_FIELD = _value
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/* utility macros */
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#define __chash_abs(x) \
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((x) < 0 ? (x) * - 1 : (x))
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#define __chash_hash(mod, _key, namespace) \
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__CHASH_HASH = namespace ## _HASH((_key), __CHASH_HASH); \
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__CHASH_HASH = __CHASH_HASH % (mod); \
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__CHASH_HASH = __chash_abs(__CHASH_HASH);
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#define __chash_probe(hashtable, _key, namespace) \
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while(__CHASH_INDEX < (hashtable)->CHASH_CAPACITY_FIELD) { \
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if((hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_STATE_FIELD == \
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CHASH_UNFILLED) \
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break; \
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\
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if((namespace ## _COMPARE((_key), \
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(hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_KEY_FIELD)) == 1) { \
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\
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__CHASH_INDEX = -1; \
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break; \
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} \
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\
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__CHASH_HASH = (__CHASH_HASH + 1) % (hashtable)->CHASH_CAPACITY_FIELD; \
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__CHASH_INDEX++; \
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} \
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#define __chash_probe_to_unfilled(mod, _key, buffer, namespace) \
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while(1) { \
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if(buffer[__CHASH_HASH].CHASH_STATE_FIELD != CHASH_FILLED) \
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break; \
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\
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if((namespace ## _COMPARE((_key), buffer[__CHASH_HASH].CHASH_KEY_FIELD)) \
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== 1) \
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break; \
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\
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__CHASH_HASH = (__CHASH_HASH + 1) % mod; \
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} \
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#define __chash_resize(hashtable, namespace) \
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do { \
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CHASH_COUNTER_TYPE __CHASH_INDEX = 0; \
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namespace ## _BUCKET *__CHASH_BUCKETS = NULL; \
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CHASH_COUNTER_TYPE __CHASH_NEXT_SIZE = (CHASH_COUNTER_TYPE) \
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CHASH_RESIZE((hashtable)->CHASH_CAPACITY_FIELD); \
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\
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if((namespace ## _HEAP) == 0) { \
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if((hashtable)->CHASH_LENGTH_FIELD != \
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(hashtable)->CHASH_CAPACITY_FIELD) { \
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break; \
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} \
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\
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fprintf(stderr, "__chash_resize: hashtable is full. could not resize" \
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" (%s:%i)\n", __FILE__, __LINE__); \
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abort(); \
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} \
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\
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if((float) (hashtable)->CHASH_LENGTH_FIELD / \
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(float) (hashtable)->CHASH_CAPACITY_FIELD < CHASH_LOAD_THRESHOLD) \
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break; \
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\
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__CHASH_BUCKETS = (namespace ## _BUCKET *)malloc((size_t) (__CHASH_NEXT_SIZE \
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* ((CHASH_COUNTER_TYPE) \
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sizeof(namespace ## _BUCKET)))); \
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memset(__CHASH_BUCKETS, 0, ((size_t) (__CHASH_NEXT_SIZE \
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* ((CHASH_COUNTER_TYPE) \
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sizeof(namespace ## _BUCKET))))); \
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\
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for(__CHASH_INDEX = 0; __CHASH_INDEX < (hashtable)->CHASH_CAPACITY_FIELD; \
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__CHASH_INDEX++) { \
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namespace ## _BUCKET __CHASH_NEW_KEY_BUCKET; \
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memset(&__CHASH_NEW_KEY_BUCKET, 0, sizeof(namespace ## _BUCKET)); \
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namespace ## _INIT(__CHASH_NEW_KEY_BUCKET, \
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(hashtable)->CHASH_BUCKETS_FIELD[__CHASH_INDEX].CHASH_KEY_FIELD, \
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(hashtable)->CHASH_BUCKETS_FIELD[__CHASH_INDEX].CHASH_VALUE_FIELD); \
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\
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if((hashtable)->CHASH_BUCKETS_FIELD[__CHASH_INDEX].CHASH_STATE_FIELD \
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!= CHASH_FILLED) \
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continue; \
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\
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__chash_hash(__CHASH_NEXT_SIZE, __CHASH_NEW_KEY_BUCKET.CHASH_KEY_FIELD, \
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namespace); \
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__chash_probe_to_unfilled(__CHASH_NEXT_SIZE, \
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(hashtable)->CHASH_BUCKETS_FIELD[__CHASH_INDEX].CHASH_KEY_FIELD, \
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__CHASH_BUCKETS, namespace) \
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\
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__CHASH_BUCKETS[__CHASH_HASH] = __CHASH_NEW_KEY_BUCKET; \
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__CHASH_BUCKETS[__CHASH_HASH].CHASH_STATE_FIELD = CHASH_FILLED; \
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__CHASH_HASH = 0; \
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} \
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\
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free((hashtable)->CHASH_BUCKETS_FIELD); \
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(hashtable)->CHASH_BUCKETS_FIELD = __CHASH_BUCKETS; \
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(hashtable)->CHASH_CAPACITY_FIELD = __CHASH_NEXT_SIZE; \
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__CHASH_HASH = 0; \
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} while(0)
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#define __chash_assert_nonnull(func, ptr) \
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do { \
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if((ptr) == NULL) { \
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fprintf(stderr, #func ": " #ptr " cannot be null (%s:%i)\n", \
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__FILE__, __LINE__); \
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abort(); \
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} \
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} while(0)
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/* operations */
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#define chash_init(hashtable, namespace) \
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NULL; \
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\
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(hashtable) = (namespace ## _TYPE *) malloc(sizeof((*(hashtable)))); \
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(hashtable)->CHASH_LENGTH_FIELD = 0; \
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(hashtable)->CHASH_CAPACITY_FIELD = CHASH_INITIAL_SIZE; \
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(hashtable)->CHASH_BUCKETS_FIELD = (namespace ## _BUCKET *) malloc(CHASH_INITIAL_SIZE \
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* sizeof(*((hashtable)->CHASH_BUCKETS_FIELD))); \
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memset((hashtable)->CHASH_BUCKETS_FIELD, 0, \
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sizeof(*((hashtable)->CHASH_BUCKETS_FIELD)) * CHASH_INITIAL_SIZE)
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#define chash_init_stack(hashtable, buffer, _length, namespace) \
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(*(hashtable)); \
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\
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if((_length) <= 0) { \
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fprintf(stderr, "chash_init_stack: hashtable cannot have a maximum " \
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"length of 0 or less (%s:%i)\n", __FILE__, __LINE__); \
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abort(); \
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} \
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\
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__chash_assert_nonnull(chash_init_stack, buffer); \
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\
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(hashtable)->CHASH_LENGTH_FIELD = 0; \
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(hashtable)->CHASH_CAPACITY_FIELD = _length; \
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(hashtable)->CHASH_BUCKETS_FIELD = buffer
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#define chash_assign(hashtable, _key, _value, namespace) \
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do { \
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long __CHASH_HASH = 0; \
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namespace ## _BUCKET __CHASH_KEY_BUCKET; \
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memset(&__CHASH_KEY_BUCKET, 0, sizeof(namespace ## _BUCKET)); \
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namespace ## _INIT(__CHASH_KEY_BUCKET, _key, _value); \
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\
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__chash_assert_nonnull(chash_assign, hashtable); \
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__chash_assert_nonnull(chash_assign, (hashtable)->CHASH_BUCKETS_FIELD); \
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__chash_resize(hashtable, namespace); \
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__chash_hash((hashtable)->CHASH_CAPACITY_FIELD, _key, namespace); \
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__chash_probe_to_unfilled((hashtable)->CHASH_CAPACITY_FIELD, \
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(_key), (hashtable)->CHASH_BUCKETS_FIELD, namespace) \
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\
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if((hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_STATE_FIELD == \
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CHASH_FILLED) { \
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namespace ## _FREE_VALUE( \
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(hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_VALUE_FIELD); \
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} else { \
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(hashtable)->CHASH_LENGTH_FIELD++; \
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} \
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\
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(hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH] = __CHASH_KEY_BUCKET; \
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(hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_STATE_FIELD = \
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CHASH_FILLED; \
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} while(0)
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#define chash_lookup(hashtable, _key, storage, namespace) \
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(void)storage; \
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\
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do { \
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int __CHASH_INDEX = 0; \
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long __CHASH_HASH = 0; \
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namespace ## _BUCKET __CHASH_KEY_BUCKET; \
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memset(&__CHASH_KEY_BUCKET, 0, sizeof(namespace ## _BUCKET)); \
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namespace ## _INIT(__CHASH_KEY_BUCKET, _key, \
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__CHASH_KEY_BUCKET.CHASH_VALUE_FIELD); \
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\
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(void) __CHASH_KEY_BUCKET; \
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\
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__chash_assert_nonnull(chash_lookup, hashtable); \
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__chash_assert_nonnull(chash_lookup, (hashtable)->CHASH_BUCKETS_FIELD); \
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__chash_hash((hashtable)->CHASH_CAPACITY_FIELD, _key, namespace); \
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__chash_probe(hashtable, _key, namespace) \
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\
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if(((hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_STATE_FIELD != \
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CHASH_FILLED) || __CHASH_INDEX != -1) { \
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fprintf(stderr, "chash_lookup: failed to find key in hashtable (%s:%i)" \
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"\n", __FILE__, __LINE__); \
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abort(); \
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} \
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\
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storage = (hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_VALUE_FIELD; \
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} while(0)
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#define chash_delete(hashtable, _key, namespace) \
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do { \
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int __CHASH_INDEX = 0; \
|
||
|
|
long __CHASH_HASH = 0; \
|
||
|
|
\
|
||
|
|
__chash_assert_nonnull(chash_delete, hashtable); \
|
||
|
|
__chash_assert_nonnull(chash_delete, (hashtable)->CHASH_BUCKETS_FIELD); \
|
||
|
|
__chash_hash((hashtable)->CHASH_CAPACITY_FIELD, _key, namespace); \
|
||
|
|
__chash_probe(hashtable, _key, namespace) \
|
||
|
|
\
|
||
|
|
if(((hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_STATE_FIELD != \
|
||
|
|
CHASH_FILLED) || __CHASH_INDEX != -1) { \
|
||
|
|
fprintf(stderr, "chash_delete: failed to find key in hashtable (%s:%i)" \
|
||
|
|
"\n", __FILE__, __LINE__); \
|
||
|
|
abort(); \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
namespace ## _FREE_KEY((hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH] \
|
||
|
|
.CHASH_KEY_FIELD); \
|
||
|
|
namespace ## _FREE_VALUE( \
|
||
|
|
(hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_VALUE_FIELD); \
|
||
|
|
(hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_STATE_FIELD = \
|
||
|
|
CHASH_TOMBSTONE; \
|
||
|
|
(hashtable)->CHASH_LENGTH_FIELD--; \
|
||
|
|
} while(0)
|
||
|
|
|
||
|
|
#define chash_contains(hashtable, _key, storage, namespace) \
|
||
|
|
1; \
|
||
|
|
\
|
||
|
|
do { \
|
||
|
|
int __CHASH_INDEX = 0; \
|
||
|
|
long __CHASH_HASH = 0; \
|
||
|
|
\
|
||
|
|
__chash_assert_nonnull(chash_contents, hashtable); \
|
||
|
|
__chash_assert_nonnull(chash_contents, (hashtable)->CHASH_BUCKETS_FIELD); \
|
||
|
|
__chash_hash((hashtable)->CHASH_CAPACITY_FIELD, _key, namespace); \
|
||
|
|
__chash_probe(hashtable, _key, namespace) \
|
||
|
|
\
|
||
|
|
if(((hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_STATE_FIELD != \
|
||
|
|
CHASH_FILLED) || __CHASH_INDEX != -1) { \
|
||
|
|
storage = 0; \
|
||
|
|
} \
|
||
|
|
} while(0)
|
||
|
|
|
||
|
|
#define chash_lookup_bucket(hashtable, _key, storage, namespace) \
|
||
|
|
storage; \
|
||
|
|
\
|
||
|
|
do { \
|
||
|
|
CHASH_COUNTER_TYPE __CHASH_INDEX = 0; \
|
||
|
|
long __CHASH_HASH = 0; \
|
||
|
|
namespace ## _BUCKET __CHASH_KEY_BUCKET; \
|
||
|
|
memset(&__CHASH_KEY_BUCKET, 0, sizeof(namespace ## _BUCKET)); \
|
||
|
|
namespace ## _INIT(__CHASH_KEY_BUCKET, _key, \
|
||
|
|
__CHASH_KEY_BUCKET.CHASH_VALUE_FIELD); \
|
||
|
|
\
|
||
|
|
(void) __CHASH_KEY_BUCKET; \
|
||
|
|
\
|
||
|
|
__chash_assert_nonnull(chash_lookup_bucket, hashtable); \
|
||
|
|
__chash_assert_nonnull(chash_lookup_bucket, \
|
||
|
|
(hashtable)->CHASH_BUCKETS_FIELD); \
|
||
|
|
__chash_hash((hashtable)->CHASH_CAPACITY_FIELD, _key, namespace); \
|
||
|
|
__chash_probe(hashtable, _key, namespace) \
|
||
|
|
\
|
||
|
|
if(((hashtable)->CHASH_BUCKETS_FIELD[__CHASH_HASH].CHASH_STATE_FIELD != \
|
||
|
|
CHASH_FILLED) || __CHASH_INDEX != -1) { \
|
||
|
|
fprintf(stderr, "chash_lookup_bucket: failed to find key in hashtable" \
|
||
|
|
"(%s:%i) \n", __FILE__, __LINE__); \
|
||
|
|
abort(); \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
storage = ((hashtable)->CHASH_BUCKETS_FIELD + __CHASH_HASH); \
|
||
|
|
} while(0)
|
||
|
|
|
||
|
|
#define chash_free(hashtable, namespace) \
|
||
|
|
do { \
|
||
|
|
__chash_assert_nonnull(chash_free, hashtable); \
|
||
|
|
__chash_assert_nonnull(chash_free, (hashtable)->CHASH_BUCKETS_FIELD); \
|
||
|
|
(hashtable)->CHASH_CAPACITY_FIELD--; \
|
||
|
|
\
|
||
|
|
while((hashtable)->CHASH_CAPACITY_FIELD != -1) { \
|
||
|
|
if((hashtable)->CHASH_BUCKETS_FIELD[(hashtable)->CHASH_CAPACITY_FIELD] \
|
||
|
|
.CHASH_STATE_FIELD != CHASH_FILLED) { \
|
||
|
|
(hashtable)->CHASH_CAPACITY_FIELD--; \
|
||
|
|
continue; \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
namespace ##_FREE_KEY( \
|
||
|
|
(hashtable)->CHASH_BUCKETS_FIELD[(hashtable)->CHASH_CAPACITY_FIELD] \
|
||
|
|
.CHASH_KEY_FIELD); \
|
||
|
|
namespace ##_FREE_VALUE( \
|
||
|
|
(hashtable)->CHASH_BUCKETS_FIELD[(hashtable)->CHASH_CAPACITY_FIELD] \
|
||
|
|
.CHASH_VALUE_FIELD); \
|
||
|
|
(hashtable)->CHASH_CAPACITY_FIELD--; \
|
||
|
|
(hashtable)->CHASH_LENGTH_FIELD--; \
|
||
|
|
} \
|
||
|
|
\
|
||
|
|
if((namespace ## _HEAP) == 1) { \
|
||
|
|
free((hashtable)->CHASH_BUCKETS_FIELD); \
|
||
|
|
free((hashtable)); \
|
||
|
|
} \
|
||
|
|
} while(0);
|
||
|
|
|
||
|
|
#define chash_is_full(hashtable, namespace) \
|
||
|
|
(((hashtable)->CHASH_LENGTH_FIELD) == ((hashtable)->CHASH_CAPACITY_FIELD))
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/* Iterator logic */
|
||
|
|
#define chash_iter(hashtable, i) \
|
||
|
|
for((i) = 0; (i) < (hashtable)->CHASH_CAPACITY_FIELD; (i)++)
|
||
|
|
|
||
|
|
#define chash_get(hashtable, key, value, i) \
|
||
|
|
if((hashtable)->CHASH_BUCKETS_FIELD[(i)].CHASH_STATE_FIELD != CHASH_FILLED) \
|
||
|
|
continue; \
|
||
|
|
\
|
||
|
|
(key) = (hashtable)->CHASH_BUCKETS_FIELD[(i)].CHASH_KEY_FIELD; \
|
||
|
|
(value) = (hashtable)->CHASH_BUCKETS_FIELD[(i)].CHASH_VALUE_FIELD
|
||
|
|
|
||
|
|
#endif
|