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94 lines
1.6 KiB
94 lines
1.6 KiB
#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include "map.h"
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#define box(t) calloc(sizeof(t), 1)
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struct page {
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struct entry {
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bool set;
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map_key_t key;
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map_value_t value;
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} p[PAGE_SIZE];
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struct page* next;
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};
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map_t map_new()
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{
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register map_t rval;
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rval.page0 = box(struct page);
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return rval;
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}
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static inline size_t page_index(map_key_t k)
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{
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return (size_t)(k % PAGE_SIZE);
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}
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void map_insert(map_t * restrict into, map_key_t k, map_value_t v)
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{
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struct page** p = &into->page0;
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size_t i = page_index(k);
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while(*p) {
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register struct page* page = *p;
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if (!page->p[i].set || page->p[i].key == k)
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{
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page->p[i] = (struct entry){.set = true, .key = k, .value = v};
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return;
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}
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p = &page->next;
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}
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// p == &<last page>.next == &NULL
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(*p = box(struct page))->p[i] = (struct entry){.set = true, .key = k, .value = v};
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}
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bool map_get(const map_t* from, map_key_t k, map_value_t* restrict v)
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{
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const struct page* p = from->page0;
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size_t i = page_index(k);
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while(p) {
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if (p->p[i].set && p->p[i].key ==k) {
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*v = p->p[i].value;
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return true;
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}
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p = p->next;
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}
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return false;
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}
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void map_free(map_t map)
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{
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while(map.page0)
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{
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struct page* next = map.page0->next;
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free(map.page0);
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map.page0 = next;
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}
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}
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static void _map_walk(map_t* restrict map, void (*cb)(struct page* page))
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{
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struct page* page= map->page0;
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while(page)
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{
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cb(page);
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page = page->next;
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}
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}
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static void _map_page_clear(struct page* page)
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{
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memset(page, 0, sizeof(struct page));
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}
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void map_clear(map_t* restrict map)
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{
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_map_walk(map, &_map_page_clear);
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}
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