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#ifndef ARENA_H
#define ARENA_H
#include <stddef.h> // size_t
struct arena_ctx {
void *buffer;
size_t size;
size_t offset;
};
#define ARENA_CTX_INIT(buffer, sz) (struct arena_ctx){(buffer), (sz), 0}
void *arena_allocate(struct arena_ctx *ctx, size_t sz);
void arena_reset(struct arena_ctx *ctx);
#ifdef ARENA_IMPLEMENTATION
#define ARENA_ALLIGNMENT 2
// #include <assert.h>
void *arena_allocate(struct arena_ctx *ctx, size_t sz)
{
if(sz % ARENA_ALLIGNMENT != 0)
sz += ARENA_ALLIGNMENT - (sz % ARENA_ALLIGNMENT);
if(ctx->offset + sz > ctx->size) return NULL;
void *off = (void *)((intptr_t)ctx->buffer + ctx->offset);
ctx->offset += sz;
// assert(((intptr_t)off & 0x1) == 0);
return off;
}
void arena_reset(struct arena_ctx *ctx) { ctx->offset = 0; }
#endif
#endif
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