45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
#define AOC_HASHMAP_RADIX 1024
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int aoc_hash(const char *string) {
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int len = strlen(string);
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int hash = 1;
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for (int i = 0; i < len; i++) {
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hash *= 7;
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hash += string[i] * 13;
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hash %= AOC_HASHMAP_RADIX;
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}
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return hash;
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}
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typedef struct AocHashmapNode AocHashmapNode;
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typedef struct AocHashmapNode {
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char *key;
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long value;
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AocHashmapNode *next;
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} AocHashmapNode;
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typedef struct AocHashmap {
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AocHashmapNode* buckets[AOC_HASHMAP_RADIX];
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} AocHashmap;
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AocHashmapNode *aoc_hashmap_get(AocHashmap *map, char *key) {
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int hash = aoc_hash(key);
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AocHashmapNode *node = map->buckets[hash];
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while (node != NULL && strcmp(node->key, key) != 0) node = node->next;
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return node;
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}
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void *aoc_hashmap_put(AocHashmap *map, char *key, long value) {
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int hash = aoc_hash(key);
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AocHashmapNode *node = map->buckets[hash];
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while (node != NULL) node = node->next;
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map->buckets[hash] = malloc(sizeof(AocHashmapNode));
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node = map->buckets[hash];
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node->key = malloc(strlen(key) + 1);
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strcpy(node->key, key);
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node->value = value;
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node->next = NULL;
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}
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