Add ft_gnl function

.gitignore

@@ -1,3 +1,23 @@
--e *.o
+# Object files
+*.o
+
+# Static library
 *.a
+
+# macOS
 .DS_Store
+
+# IDE / Editors
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# Debug
+*.dSYM/
+
+# Test binaries
+a.out
+test
+main

Makefile

@@ -16,7 +16,8 @@ SRCS =	ft_atoi.c ft_bzero.c ft_calloc.c ft_isalnum.c ft_isalpha.c \
 		ft_itoa.c ft_strmapi.c ft_striteri.c ft_putchar_fd.c \
 		ft_putstr_fd.c ft_putendl_fd.c ft_putnbr_fd.c \
 		ft_lstnew.c ft_lstadd_front.c ft_lstsize.c ft_lstlast.c ft_lstadd_back.c \
-		ft_lstdelone.c ft_lstclear.c ft_lstiter.c ft_lstmap.c
+		ft_lstdelone.c ft_lstclear.c ft_lstiter.c ft_lstmap.c \
+		ft_gnl.c
 
 SRCS := $(addprefix $(SRC_DIR)/, $(SRCS))
 OBJS = $(SRCS:.c=.o)

includes/libft.h

@@ -19,6 +19,10 @@
 # include <unistd.h>
 # include <limits.h>
 
+# ifndef BUFFER_SIZE
+#  define BUFFER_SIZE 42
+# endif
+
 typedef struct s_list
 {
 	void			*content;
@@ -66,14 +70,16 @@ void			ft_putendl_fd(char *s, int fd);
 void			ft_putnbr_fd(int n, int fd);
 
 t_list			*ft_lstnew(void *content);
-void			ft_lstadd_front(t_list **lst, t_list *new);
+void			ft_lstadd_front(t_list **lst, t_list *new_node);
 int				ft_lstsize(t_list *lst);
 t_list			*ft_lstlast(t_list *lst);
-void			ft_lstadd_back(t_list **lst, t_list *new);
+void			ft_lstadd_back(t_list **lst, t_list *new_node);
 void			ft_lstdelone(t_list *lst, void (*del)(void *));
 void			ft_lstclear(t_list **lst, void (*del)(void *));
 void			ft_lstiter(t_list *lst, void (*f)(void *));
 t_list			*ft_lstmap(t_list *lst, void *(*f)(void *),
 					void (*del)(void *));
 
+char			*ft_gnl(int fd);
+
 #endif

src/ft_gnl.c

@@ -0,0 +1,97 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   ft_gnl.c                                           :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lmouta-g <lmouta-g@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2025/11/19 16:18:23 by lm0uta            #+#    #+#             */
+/*   Updated: 2025/12/19 14:26:07 by lmouta-g         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "../includes/libft.h"
+
+static char	*gnl_strjoin(char *stash, char *buffer)
+{
+	char	*tmp;
+	char	*result;
+
+	if (!stash)
+		return (ft_strdup(buffer));
+	tmp = ft_strjoin(stash, buffer);
+	free(stash);
+	if (!tmp)
+		return (NULL);
+	result = tmp;
+	return (result);
+}
+
+static char	*extract_line(char *stash)
+{
+	size_t	len;
+	char	*newline;
+
+	if (!stash || !*stash)
+		return (NULL);
+	newline = ft_strchr(stash, '\n');
+	if (newline)
+		len = newline - stash + 1;
+	else
+		len = ft_strlen(stash);
+	return (ft_substr(stash, 0, len));
+}
+
+static char	*update_stash(char *stash)
+{
+	size_t	i;
+	char	*new_stash;
+
+	if (!stash)
+		return (NULL);
+	i = 0;
+	while (stash[i] && stash[i] != '\n')
+		i++;
+	if (stash[i] == '\n')
+		i++;
+	if (!stash[i])
+		return (free(stash), NULL);
+	new_stash = ft_strdup(stash + i);
+	free(stash);
+	return (new_stash);
+}
+
+/**
+ * ft_gnl - reads a line from file descriptor
+ * @fd: file descriptor to read from
+ * Return: line read or NULL if EOF/error
+ */
+char	*ft_gnl(int fd)
+{
+	static char	*stash;
+	char		*buffer;
+	ssize_t		bytes;
+	char		*line;
+
+	if (fd < 0 || BUFFER_SIZE <= 0)
+		return (NULL);
+	buffer = malloc(BUFFER_SIZE + 1);
+	if (!buffer)
+		return (NULL);
+	while (!stash || !ft_strchr(stash, '\n'))
+	{
+		bytes = read(fd, buffer, BUFFER_SIZE);
+		if (bytes == -1)
+			return (free(buffer), free(stash), stash = NULL, NULL);
+		if (bytes == 0)
+			break ;
+		buffer[bytes] = '\0';
+		stash = gnl_strjoin(stash, buffer);
+		if (!stash)
+			return (free(buffer), NULL);
+	}
+	free(buffer);
+	line = extract_line(stash);
+	stash = update_stash(stash);
+	return (line);
+}

src/ft_lstadd_back.c

@@ -15,21 +15,21 @@
 /**
  * ft_lstadd_back - adds node at list end
  * @lst: pointer to list head
- * @new: node to add
+ * @new_node: node to add
  */
-void	ft_lstadd_back(t_list **lst, t_list *new)
+void	ft_lstadd_back(t_list **lst, t_list *new_node)
 {
 	t_list	*tmp;
 
-	if (!lst || !new)
+	if (!lst || !new_node)
 		return ;
 	if (!(*lst))
 	{
-		*lst = new;
+		*lst = new_node;
 		return ;
 	}
 	tmp = *lst;
 	while (tmp->next)
 		tmp = tmp->next;
-	tmp->next = new;
+	tmp->next = new_node;
 }

src/ft_lstadd_front.c

@@ -15,12 +15,12 @@
 /**
  * ft_lstadd_front - adds node at list start
  * @lst: pointer to list head
- * @new: node to add
+ * @new_node: node to add
  */
-void	ft_lstadd_front(t_list **lst, t_list *new)
+void	ft_lstadd_front(t_list **lst, t_list *new_node)
 {
-	if (!lst || !new)
+	if (!lst || !new_node)
 		return ;
-	new->next = *lst;
-	*lst = new;
+	new_node->next = *lst;
+	*lst = new_node;
 }