laentropia
121261e24b
ArenaPointer now contains a reference to the original arena and an offset instad of a raw address. Change was made to avoid invalidating addresses and keeping a more consise system. arena_unwrap_pointer was also included as a helper function.
69 lines
1.4 KiB
C
69 lines
1.4 KiB
C
#ifndef ARENA_H
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#define ARENA_H
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#include <stdint.h>
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#include <stdlib.h>
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#include <inttypes.h>
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#include <stdbool.h>
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typedef struct {
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uint8_t *buffer;
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size_t capacity;
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size_t offset;
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} Arena;
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typedef enum {
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ARENA_OK = 0,
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ARENA_BAD_ALLOC,
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ARENA_OUT_OF_SPACE,
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ARENA_NULL_ARG,
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ARENA_INVALID_SIZE,
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ARENA_INVALID_ALIGN,
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ARENA_CAPACITY_OVERFLOW,
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} ArenaErr;
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typedef struct {
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bool is_valid;
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union {
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ArenaErr err;
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struct {
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Arena *arena;
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size_t offset;
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};
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};
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} ArenaPointer;
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typedef struct {
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bool is_valid;
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union {
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ArenaErr err;
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Arena arena;
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};
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} ArenaResult;
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typedef struct {
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bool is_valid;
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union {
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ArenaErr err;
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size_t val;
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};
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} SizeResult;
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ArenaResult arena_init(size_t capacity);
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void arena_destroy(Arena *arena);
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ArenaPointer arena_alloc(Arena *arena, size_t size, size_t alignment);
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ArenaPointer arena_push(Arena *arena, void *data, size_t size, size_t alignment);
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ArenaErr arena_realloc(Arena *arena, size_t new_capacity);
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void *arena_unwrap_pointer(ArenaPointer p);
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SizeResult get_arena_align_padding(Arena *arena, size_t alignment);
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ArenaErr arena_ensure_capacity(Arena *arena, size_t size, size_t alignment);
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// Should be moved to something like general utilities,
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// i should make one for all my c projects
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bool mul_size_t_safe(size_t a, size_t b, size_t *out);
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#endif // !ARENA_H
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