47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
/* SPDX-License-Identifier:BSD-3-Clause */
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#include "arena.h"
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#include <stdlib.h>
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struct arena_allocator *arena_init(usize size)
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{
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struct arena_allocator *allocator = (struct arena_allocator *)malloc(sizeof(struct arena_allocator));
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allocator->size = size;
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allocator->base = (usize) malloc(size);
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allocator->position = 0;
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return allocator;
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}
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void arena_deinit(struct arena_allocator *allocator)
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{
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free((void *)allocator->base);
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free((void *)allocator);
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}
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void *arena_alloc(struct arena_allocator *allocator, usize size)
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{
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if (allocator->position + size >= allocator->size) {
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allocator->size = allocator->position + size;
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allocator->base = (usize) realloc((void *)allocator->base, allocator->size + allocator->size / 2);
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}
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void *ptr = (void *)(allocator->base + allocator->position);
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allocator->position += size;
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return ptr;
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}
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void *arena_zalloc(struct arena_allocator *allocator, usize size)
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{
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void *ptr = arena_alloc(allocator, size);
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for (usize i = 0; i < size; i++) {
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((u8 *) ptr)[i] = 0x0;
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}
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return ptr;
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}
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void arena_bump(struct arena_allocator *allocator)
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{
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allocator->position = 0;
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}
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