FEAT: add gnl makefile, have to fix check input

src/get_next_line.c

@@ -0,0 +1,137 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   get_next_line.c                                    :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: lud-adam <lud-adam@student.42.fr>          +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2026/03/28 15:07:17 by lud-adam          #+#    #+#             */
+/*   Updated: 2026/03/28 15:13:54 by lud-adam         ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "get_next_line.h"
+#include "../libft/libft.h"
+
+size_t	ft_strlen_with_c(char *str, char c)
+{
+	size_t	i;
+
+	i = 0;
+	if (!str)
+		return (0);
+	while (str[i] && str[i] != c)
+		i++;
+	return (i);
+}
+
+size_t	detect_newline(char *str)
+{
+	size_t	i;
+
+	i = 0;
+	if (!str)
+		return (0);
+	while (str[i])
+	{
+		if (str[i] == '\n')
+			return (1);
+		i++;
+	}
+	return (0);
+}
+
+static void	fill_line(char *line, char *c_remaining, char *src, size_t *index)
+{
+	size_t	i;
+	size_t	j;
+
+	i = 0;
+	j = 0;
+	while (c_remaining && c_remaining[i])
+	{
+		line[i] = c_remaining[i];
+		i++;
+	}
+	while (src[j] && src[j] != '\n')
+	{
+		line[i + j] = src[j];
+		src[j] = 0;
+		j++;
+	}
+	if (src[j] == '\n')
+		line[i + j] = '\n';
+	*index = j;
+}
+
+char	*build_line(char *src, char *c_remaining, size_t *index)
+{
+	char	*line;
+	size_t	size;
+	size_t	is_jump;
+
+	is_jump = detect_newline(src);
+	size = ft_strlen_with_c(src, '\n') + ft_strlen_with_c(c_remaining, '\0') + is_jump + 1;
+	line = ft_calloc(size, sizeof(char));
+	if (!line)
+	{
+		free(c_remaining);
+		return (NULL);
+	}
+	if (!src)
+		return (NULL);
+	fill_line(line, c_remaining, src, index);
+	if (c_remaining)
+		free(c_remaining);
+	return (line);
+}
+
+static void	read_file(int fd, char *buffer, ssize_t *nb_read)
+{
+	*nb_read = read(fd, buffer, BUFFER_SIZE);
+	if (*nb_read < 0)
+		return ;
+	buffer[*nb_read] = '\0';
+}
+
+static char	*get_the_line(int fd, char *buffer)
+{
+	char	*line;
+	size_t	i;
+	ssize_t	nb_read;
+
+	i = 0;
+	nb_read = 0;
+	line = NULL;
+	if (buffer[0] != '\0')
+	{
+		line = build_line(buffer, NULL, &i);
+		if (!line)
+			return (NULL);
+		ft_memcpy(buffer + i + 1, buffer, ft_strlen_with_c(buffer + i, '\0'));
+	}
+	while (detect_newline(line) != 0)
+	{
+		read_file(fd, buffer, &nb_read);
+		if (nb_read < 0)
+			return (free(line), NULL);
+		if (nb_read == 0)
+			break ;
+		line = build_line(buffer, line, &i);
+		ft_memcpy(buffer + i + 1, buffer, ft_strlen_with_c(buffer + i, '\0'));
+	}
+	return (line);
+}
+
+char	*get_next_line(int fd)
+{
+	static char	buffer[BUFFER_SIZE + 1] = "";
+	char		*line;
+
+	if (fd < 0 || BUFFER_SIZE <= 0)
+		return (NULL);
+	line = get_the_line(fd, buffer);
+	if (!line)
+		return (NULL);
+	return (line);
+}