#ifndef ARENA_INCLUDED
#define ARENA_INCLUDED

#include <stddef.h>

#define SIZEOF(x)    (ptrdiff_t)sizeof(x)
#define NELEMS(a)   (sizeof(a) / sizeof(*(a)))
#define LEN(s)  (NELEMS(s) - 1)
#define KB(x) ((size_t)(x) << 10)  // 1 KB = 1024 bytes
#define MB(x) ((size_t)(x) << 20)  // 1 MB = 1024 * 1024 bytes
#define GB(x) ((size_t)(x) << 30)  // 1 GB = 1024 * 1024 * 1024 bytes
                                   
typedef struct {
    char* beg;
    char* end;
} Arena;

typedef enum {
    NOZERO   = 0x1,
    SOFTFAIL = 0x2,
} ArenaFlags;

Arena arena_new(ptrdiff_t cap, int flags);
char* arena_alloc(Arena* a, ptrdiff_t nb, ptrdiff_t align, ptrdiff_t count, int flags);


#endif