#include <alloc/arena.h>

rr_arena_s rr_new_arena(usz_t capacity)
{
    rr_arena_s arena;
    arena.capacity = capacity;
    arena.offset = 0;
    arena.allocation = malloc(capacity);
    return arena;
}

void rr_delete_arena(rr_arena_s *arena)
{
    if(arena->allocation == NULL) return;
    free(arena->allocation);
    arena->allocation = NULL;
}



void * rr_arena_alloc(rr_arena_s *arena, usz_t length)
{
    if((arena->offset + length) > arena->capacity)
        return NULL;

    void *block = &arena->allocation[arena->offset];
    arena->offset += length;
    return block;
}

char * rr_arena_clone_string(rr_arena_s *arena, char *string)
{
    usz_t len_string = rr_measure_string(string);
    char *cloned_string = rr_arena_alloc(arena, len_string+1);
    if(cloned_string == NULL)
        return NULL;
    rr_memcopy(cloned_string, string, len_string);
    cloned_string[len_string] = 0x00;

    return cloned_string;
}