43 lines
1.0 KiB
C
43 lines
1.0 KiB
C
#include "cig.h"
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static inline int mapping_cap(int capacity) {
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return capacity * 2;
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}
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void *hashmap_create_func(
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hashmap_create_func_args_t args
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) {
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const size_t cap_of_index_arr =
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sizeof(int) * mapping_cap(args.initial_capacity);
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const size_t INC = ALIGN_OF(int);
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const size_t SIZE = args.itemsize * args.initial_capacity;
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const size_t cap_of_items_arr = (SIZE + INC - 1) / INC;
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const size_t bytes =
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sizeof(hashmap_header_t) + cap_of_items_arr + cap_of_index_arr;
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hashmap_header_t *header =
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allocator_alloc_func(
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args.allocator,
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bytes,
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args.file,
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args.line
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);
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header->n_items = 0;
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header->capacity = args.initial_capacity;
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header->itemsize = args.itemsize;
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header->keysize = args.keysize;
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header->allocator = args.allocator;
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header->hash = args.hash;
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header->equals = args.equals;
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header->mapping_arr = (int*) &header->bytes[cap_of_items_arr];
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header->mapping_capacity = mapping_cap(args.initial_capacity);
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for ( int i = 0; i < header->mapping_capacity; i++ ) {
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header->mapping_arr[i] = -1;
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}
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return header->bytes;
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}
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