#include "stack.h"
#include <stdlib.h>

void stack_init(t_stack& stack, const int size) {
	if (stack.data != nullptr) free(stack.data);
	stack.data = (unsigned char*)malloc(size);
	stack.max = size;
	stack.top = -1;
}

const bool stack_isempty(t_stack& stack) {
	return stack.top == -1;
}

const bool stack_isfull(t_stack& stack) {
	return stack.top == stack.max;
}

void stack_push(t_stack& stack, const unsigned char value) {
	if (!stack_isfull(stack)) {
		stack.data[++stack.top] = value;
	}
}

const unsigned char stack_pop(t_stack& stack) {
	if (!stack_isempty(stack)) {
		return stack.data[stack.top--];
	}

}

const unsigned char stack_peek(t_stack& stack) {
	return stack.data[stack.top];
}

void stack_delete(t_stack& stack) {
	free(stack.data);
}