pool.c

typedef struct pool_s
{
    char *next;
    char *end;
} pool_t;

pool_t *pool_create(const size_t sz)
{
    pool_t *p = malloc(sz + sizeof *p);
    assert(p != NULL);
    p->next = (char*)&p[1];
    p->end = p->next + sz;
    return p;
}

void pool_free(pool_t *p)
{
    free(p);
}

size_t pool_aviable(const pool_t *p)
{
    assert(p != NULL);
    return p->end - p->next;
}

void *pool_alloc(pool_t *p, const size_t sz)
{
    assert(p != NULL);
    if (pool_aviable(p) < sz) return NULL;
    void *mem = (void *)p->next;
    p->next += sz;
    return mem;
}