getters.c

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/* ************************************************************************** */
/*      ____    _    _____ ____     _    _   _   _____ _  _   ____  ____      */
/*     / ___|  / \  |  ___|  _ \   / \  | \ | | |_   _| || | |  _ \/ ___|     */
/*     \___ \ / _ \ | |_  | |_) | / _ \ |  \| |   | | | || |_| | | \___ \     */
/*      ___) / ___ \|  _| |  _ < / ___ \| |\  |   | | |__   _| |_| |___) |    */
/*     |____/_/   \_|_|   |_| \_/_/   \_|_| \_|   |_|    |_| |____/|____/     */
/*                                                                            */
/* ************************************************************************** */
 
#include "private.h"
 
#include "o2s/deque.h"

size_t deque_count(const deque_t* self)
{
    return self->count;
}

size_t deque_capacity(const deque_t* self)
{
    return self->capacity;
}

void* deque_first(const deque_t* self)
{
    if (deque_is_empty(self))
        return NULL;
    return self->front;
}

void* deque_last(const deque_t* self)
{
    if (deque_is_empty(self))
        return NULL;
    return (self->back == deque_begin(self) ? deque_end(self) : self->back)
           - deque_offset(self, 1);
}

bool deque_is_empty(const deque_t* self)
{
    return deque_count(self) == 0;
}

bool deque_is_full(const deque_t* self)
{
    return deque_count(self) == deque_capacity(self);
}

void* deque_get(const deque_t* self, size_t index)
{
    if (index >= deque_count(self))
        return NULL;
    void* result = self->front + deque_offset(self, index);
    if (result >= deque_end(self))
        result -= deque_offset(self, deque_capacity(self));
    return result;
}