redirection parsing: add utility functions for t_redir_list

Makefile

@@ -51,6 +51,7 @@ srcs = \
 	src/parser/wordsplit/wordsplit.c \
 	src/parser/wordsplit/wordsplit_utils.c \
 	src/postprocess/redirections/redirection.c \
+	src/postprocess/redirections/redirection_list.c \
 	src/postprocess/redirections/redirection_parsing.c \
 
 objs = $(srcs:.c=.o)

src/postprocess/redirections/redirection_list.c

@@ -0,0 +1,67 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   redirection_list.c                                 :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/03/07 14:29:53 by khais             #+#    #+#             */
+/*   Updated: 2025/03/07 14:48:20 by khais            ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "redirection_list.h"
+#include "redirection.h"
+#include "libft.h"
+
+/*
+** create a new redir list item, with the given item
+**
+** may return null in case of allocation failure
+*/
+static t_redir_list	*redir_list_create(t_redirection *item)
+{
+	t_redir_list	*out;
+
+	out = ft_calloc(1, sizeof(t_redir_list));
+	if (out == NULL)
+		return (NULL);
+	out->redirection = item;
+	return (out);
+}
+
+/*
+** free all memory associated with this redir list
+*/
+static void	redir_list_destroy(t_redir_list *lst)
+{
+	t_redir_list	*prev;
+
+	while (lst != NULL)
+	{
+		redirection_destroy(lst->redirection);
+		prev = lst;
+		lst = lst->next;
+		free(prev);
+	}
+}
+
+/*
+** Add the given item to the end of the given list.
+**
+** If allocation fails, return null.
+*/
+t_redir_list	*redir_list_push(t_redir_list *lst, t_redirection *item)
+{
+	t_redir_list	*start;
+
+	if (lst == NULL)
+		return (redir_list_create(item));
+	start = lst;
+	while (lst->next != NULL)
+		lst = lst->next;
+	lst->next = redir_list_create(item);
+	if (lst->next == NULL)
+		return (redir_list_destroy(start), NULL);
+	return (start);
+}

src/postprocess/redirections/redirection_list.h

@@ -6,7 +6,7 @@
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/03/07 14:29:32 by khais             #+#    #+#             */
-/*   Updated: 2025/03/07 14:43:50 by khais            ###   ########.fr       */
+/*   Updated: 2025/03/07 14:48:41 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -21,4 +21,6 @@ typedef struct s_redirection_list
 	struct s_redirection_list	*next;
 }	t_redir_list;
 
+t_redir_list	*redir_list_push(t_redir_list *lst, t_redirection *item);
+
 #endif // REDIRECTION_LIST_H