Add index in t_stack + indexer function to add it

parsing/indexer.c

@@ -0,0 +1,54 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   indexer.c                                          :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dgaillet <dgaillet@student.42lyon.fr>      +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2026/01/14 10:14:06 by dgaillet          #+#    #+#             */
+/*   Updated: 2026/01/14 10:14:08 by dgaillet         ###   ########lyon.fr   */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "push_swap.h"
+
+static t_stack	*first_without_index(t_stack *stack)
+{
+	t_stack	*first;
+
+	if (stack->index < 0)
+		return (stack);
+	first = stack;
+	stack = stack->next;
+	while (stack != first)
+	{
+		if (stack->index < 0)
+			return (stack);
+		stack = stack->next;
+	}
+	return ((void *) 0);
+}
+
+void	indexer(t_stacks *stacks)
+{
+	int		i;
+	int		len;
+	t_stack	*lower;
+	t_stack	*temp;
+
+	i = 0;
+	len = stack_a_len(stacks);
+	while (i < len)
+	{
+		lower = first_without_index(stacks->a);
+		temp = lower->next;
+		while (temp != stacks->a)
+		{
+			if (lower->value > temp->value && temp->index < 0)
+				lower = temp;
+			temp = temp->next;
+		}
+		lower->index = i;
+		i++;
+	}
+}