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tablec.c
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tablec.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "tablec.h"
void tablec_init(struct tablec_ht *tablec, size_t max_capacity) {
tablec->buckets = malloc(sizeof(struct tablec_buckets) * max_capacity);
tablec->capacity = max_capacity;
tablec->length = 0;
while (max_capacity--) {
tablec->buckets[max_capacity].capacity = 1;
tablec->buckets[max_capacity].length = 0;
tablec->buckets[max_capacity].array = malloc(sizeof(struct tablec_bucket));
tablec->buckets[max_capacity].array[0].key = NULL;
tablec->buckets[max_capacity].array[0].value = NULL;
}
}
static size_t _tablec_hash(struct tablec_ht *tablec, char *key) {
size_t hash = 0, i = 0;
while (key[i] != '\0') hash = hash * 37 + (key[i++] & 255);
return hash % tablec->capacity;
}
void tablec_resize(struct tablec_ht *tablec, size_t new_max_capacity) {
size_t i = tablec->capacity;
struct tablec_ht newHashtable;
tablec_init(&newHashtable, new_max_capacity);
if (tablec->length != 0) while (i--) {
if (tablec->buckets[i].length == 0) continue;
if (tablec->buckets[i].length == 1) {
tablec_set(&newHashtable, tablec->buckets[i].array[0].key, tablec->buckets[i].array[0].value);
continue;
}
while (tablec->buckets[i].capacity-- - 1) {
if (tablec->buckets[i].array[tablec->buckets[i].capacity - 1].key)
tablec_set(&newHashtable, tablec->buckets[i].array[tablec->buckets[i].capacity - 1].key, tablec->buckets[i].array[tablec->buckets[i].capacity - 1].value);
}
}
tablec_cleanup(tablec);
*tablec = newHashtable;
}
void tablec_set(struct tablec_ht *tablec, char *key, void *value) {
struct tablec_bucket *newArray = NULL;
size_t hash = _tablec_hash(tablec, key);
if (tablec->buckets[hash].length == 0) {
if (tablec->buckets[hash].array[0].key == NULL) {
tablec->buckets[hash].array[0].key = key;
tablec->buckets[hash].array[0].value = value;
tablec->length++;
tablec->buckets[hash].length = 1;
} else {
tablec->buckets[hash].capacity = 2;
newArray = malloc(sizeof(struct tablec_bucket) * 2);
newArray[0].key = tablec->buckets[hash].array[0].key;
newArray[0].value = tablec->buckets[hash].array[0].value;
free(tablec->buckets[hash].array);
newArray[1].key = key;
newArray[1].value = value;
tablec->buckets[hash].array = newArray;
tablec->buckets[hash].length = 2;
tablec->length++;
}
} else {
size_t i = tablec->buckets[hash].capacity;
while (i--) {
if (tablec->buckets[hash].array[i].key) continue;
tablec->buckets[hash].array[i].key = key;
tablec->buckets[hash].array[i].value = value;
tablec->buckets[hash].length++;
tablec->length++;
return;
}
i = tablec->buckets[hash].capacity;
newArray = calloc(sizeof(struct tablec_bucket) * (tablec->buckets[hash].capacity * 2), 1);
while (i--) {
if (!tablec->buckets[hash].array[i].key) {
newArray[i].key = NULL;
newArray[i].value = NULL;
continue;
}
newArray[i].key = tablec->buckets[hash].array[i].key;
newArray[i].value = tablec->buckets[hash].array[i].value;
}
free(tablec->buckets[hash].array);
newArray[tablec->buckets[hash].length].key = key;
newArray[tablec->buckets[hash].length].value = value;
tablec->buckets[hash].array = newArray;
tablec->buckets[hash].capacity *= 2;
tablec->buckets[hash].length++;
return;
}
}
struct tablec_bucket *tablec_get(struct tablec_ht *tablec, char *key) {
size_t hash = _tablec_hash(tablec, key), i = tablec->buckets[hash].capacity;
if (tablec->buckets[hash].length == 0) return NULL;
while (i--) {
if (tablec->buckets[hash].array[i].key != NULL && strcmp(tablec->buckets[hash].array[i].key, key) == 0)
return &tablec->buckets[hash].array[i];
}
return NULL;
}
void tablec_del(struct tablec_ht *tablec, char *key) {
size_t hash = _tablec_hash(tablec, key), i = tablec->buckets[hash].capacity;
if (tablec->buckets[hash].length == 0) return;
while (i--) {
if (tablec->buckets[hash].array[i].key && strcmp(tablec->buckets[hash].array[i].key, key) == 0) {
tablec->buckets[hash].array[i].key = NULL;
tablec->buckets[hash].array[i].value = NULL;
tablec->length--;
tablec->buckets[hash].length--;
return;
}
}
}
int tablec_full(struct tablec_ht *tablec) {
return tablec->capacity == tablec->length ? -1 : tablec->capacity - tablec->length;
}
void tablec_cleanup(struct tablec_ht *tablec) {
while (tablec->capacity--)
free(tablec->buckets[tablec->capacity].array);
free(tablec->buckets);
}