Arena/include/arena.h

#ifndef ARENA_H
#define ARENA_H

#include <stdint.h>
#include <stdlib.h>
#include <inttypes.h>
#include <stdbool.h>

typedef struct {
    uint8_t *buffer;
    size_t size;
    size_t offset;
} Arena;

typedef enum {
    ARENA_OK = 0,
    ARENA_BAD_ALLOC,
    ARENA_OUT_OF_SPACE,
    ARENA_NULL_ARG,
    ARENA_INVALID_SIZE,
    ARENA_INVALID_ALIGN,
} ArenaErr;

typedef struct {
    bool is_valid;
    union {
        ArenaErr err;
        uint8_t *address;
    };
} ArenaPointer;

typedef struct {
    bool is_valid;
    union {
        ArenaErr err;
        Arena arena;
    };
} ArenaResult;

typedef struct {
    bool is_valid;
    union {
        ArenaErr err;
        size_t val;
    };
} SizeResult;

ArenaResult arena_init(size_t size);
void arena_destroy(Arena *arena);

ArenaPointer arena_alloc(Arena *arena, size_t size, size_t alignment);
ArenaErr arena_push(Arena *arena, void *data, size_t size, size_t alignment);
ArenaErr arena_realloc(Arena *arena, size_t new_size);

SizeResult align_arena_offset(Arena *arena, size_t alignment);
SizeResult arena_compute_necessary_capacity(size_t capacity, size_t elem_size);

#endif // !ARENA_H