#include "OperandStack.h"

int OStackSize(OperandStack* stack) {
    return stack->top;
}

int OStackPush(OperandStack* stack, int operand) {
    if (OStackSize(stack) >= TYPE_STACK_SIZE) {
        // Stack overflow
        return -1;
    }

    stack->operands[stack->top] = operand;
    stack->top++;

    return 0;
}

int OStackPop(OperandStack* stack, int* result) {
    if (OStackSize(stack) == 0) {
        // Stack underflow
        return -1;
    }

    *result = stack->operands[stack->top - 1];
    stack->top--;

    return 0;
}