cKit/Memory/c_Arena.h

#ifndef INCLUDED_C_ARENA_H
#define INCLUDED_C_ARENA_H

#ifndef INCLUDED_C_TYPES_H
#include <c_Types.h>
#endif /*INCLUDED_C_TYPES_H*/

#ifndef INCLUDED_C_ALIGNMENT_H
#include <c_Alignment.h>
#endif /*INCLUDED_C_ALIGNMENT_H*/


/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

typedef struct c_Arena_s c_Arena_t;
struct c_Arena_s {
    unsigned char *buf;
    c_size_t         buf_len;
    c_size_t         prev_offset; // This will be useful for later on
    c_size_t         curr_offset;
};

/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

C_STATIC_FORCE_INLINE
void c_Arena_Init(c_Arena_t *a, void *backing_buffer, size_t backing_buffer_length) {
    a->buf = (unsigned char *)backing_buffer;
    a->buf_len = backing_buffer_length;
    a->curr_offset = 0;
    a->prev_offset = 0;
}

C_STATIC_FORCE_INLINE
void c_Arena_Destroy(c_Arena_t *a) {
    a->curr_offset = 0;
    a->prev_offset = 0;
}

C_STATIC_FORCE_INLINE
void c_Arena_Free(c_Arena_t *a, void *ptr) {
    C_UNUSED(a);
    C_UNUSED(ptr);
}

void *c_Arena_Alloc(c_Arena_t *a, c_size_t size);

void *c_Arena_Resize(c_Arena_t *a, void *old_memory, size_t old_size, size_t new_size);

/* ------------------------------------------------------------------------------------------------------------------ */
/*  */

typedef struct c_ArenaTemp_s c_ArenaTemp_t;
struct c_ArenaTemp_s {
    c_Arena_t *arena;
    size_t prev_offset;
    size_t curr_offset;
};

C_STATIC_FORCE_INLINE
c_ArenaTemp_t c_ArenaTemp_Begin(c_Arena_t *a) {
    c_ArenaTemp_t temp;
    temp.arena = a;
    temp.prev_offset = a->prev_offset;
    temp.curr_offset = a->curr_offset;
    return temp;
}

C_STATIC_FORCE_INLINE
void c_ArenaTemp_End(c_ArenaTemp_t temp) {
    temp.arena->prev_offset = temp.prev_offset;
    temp.arena->curr_offset = temp.curr_offset;
}

#endif /*INCLUDED_C_ARENA_H*/