mem/include/mem.h

#ifndef MEM_INCLUDED
#define MEM_INCLUDED

#include "except.h" // Exceptions

#include <stddef.h> // size_t
#define MEM_KB(x) ((size_t)(x) * 1024ULL)
#define MEM_MB(x) ((size_t)(x) * 1024ULL * 1024ULL)
#define MEM_GB(x) ((size_t)(x) * 1024ULL * 1024ULL * 1024ULL)
#define MEM_SIZE(x)    (ptrdiff_t)sizeof(x)
#define MEM_COUNT(a)   (MEM_SIZE(a) / MEM_SIZE(*(a)))
#define MEM_LEN(s)     (MEM_COUNT(s) - 1)


/* Default behavior is to throw exceptions and zero out memory*/
enum MemFlags {
    NOZERO       = 1 << 0,  /* 0001 */
    SOFT_FAIL    = 1 << 1,  /* 0010 */
    HARD_FAIL    = 1 << 2,  /* 0100 */
};

struct Arena{
    unsigned char *beg;
    unsigned char *end;
};
typedef struct Arena Arena;

extern const Exception OOM; // Out of memory

extern void *mem_alloc (int flags, size_t nbytes, const char *file, int line);
extern void mem_free(void *ptr, const char *file, int line);
extern void *mem_resize(int flags, void *ptr, size_t nbytes, 
        const char *file, int line);
extern int mem_is_zero(const void *ptr, size_t nbytes);
extern Arena mem_arena_new(int flags, size_t nbytes, const char *file, int line);
extern void *mem_arena_alloc(int flags, Arena *a, 
        size_t nbytes, size_t align, size_t count, const char *file, int line);

#define ALLOC(flags, nbytes)  mem_alloc((flags), (nbytes), __FILE__, __LINE__)
#define FREE(ptr) ((void)(mem_free((ptr), __FILE__, __LINE__), (ptr) = 0))
#define RESIZE(flags, ptr, nbytes) 	((ptr) = mem_resize((flags), (ptr), \
	(nbytes), __FILE__, __LINE__))
#define ARENA(flags, nbytes)\
    mem_arena_new((flags), (nbytes), __FILE__, __LINE__)
#define ARENA_ALLOC(flags, a, nbytes, align, count) \
    mem_arena_alloc((flags), (a), (nbytes), (align), (count), __FILE__, __LINE__)
#define ARENA_FREE(a) mem_free(a.beg, __FILE__, __LINE__)

#endif