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swap_op.c
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swap_op.c
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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* swap_op.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: dnishsha <dnishsha@student.42berlin.d +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2023/07/10 10:27:18 by dnishsha #+# #+# */
/* Updated: 2023/07/10 10:27:23 by dnishsha ### ########.fr */
/* */
/* ************************************************************************** */
#include "push_swap.h"
// Swap the first 2 elements at the top of stack
static void swap(t_stack_node **stack)
{
int temp;
temp = (*stack)->value;
(*stack)->value = ((*stack)->next)->value;
(*stack)->current_pos = 0;
(*stack)->next->value = temp;
(*stack)->next->current_pos = 1;
}
// Swap the first 2 elements at the top of stack a.
// Do nothing if there is only one or no elements.
void sa(t_stack_node **a)
{
if (*a && ((*a)->next))
{
swap(a);
write(1, "sa\n", 3);
}
}
// Swap the first 2 elements at the top of stack b.
// Do nothing if there is only one or no elements.
void sb(t_stack_node **b)
{
if (*b && ((*b)->next))
{
swap(b);
write(1, "sb\n", 3);
}
}
// sa and sb at the same time.
void ss(t_stack_node **a, t_stack_node **b)
{
if (*a && ((*a)->next) && *b && ((*b)->next))
{
swap(a);
swap(b);
write(1, "ss\n", 3);
}
}