gnl/get_next_line.c at main · SLargo18/gnl · GitHub

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: slargo-b <slargo-b@student.42madrid.com    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/02/10 16:14:17 by slargo-b          #+#    #+#             */
/*   Updated: 2025/02/12 11:18:51 by slargo-b         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"

static char	*update_save(char *save)
{
	char	*new_save;
	int		i;
	int		j;

	i = 0;
	while (save && save[i] && save[i] != '\n')
		i++;
	if (save && !save[i])
		return (free(save), NULL);
	new_save = malloc(ft_strlen(save) - i + 1);
	if (!new_save)
		return (NULL);
	i++;
	j = 0;
	while (save && save[i])
		new_save[j++] = save[i++];
	new_save[j] = '\0';
	return (free(save), new_save);
}

static char	*get_line(char *save)
{
	char	*line;
	int		i;

	i = 0;
	if (!save)
		return (NULL);
	while (save[i] && save[i] != '\n')
		i++;
	if (save[i] == '\n')
		i++;
	line = malloc((i + 1) * sizeof(char));
	if (!line)
		return (NULL);
	i = 0;
	while (save[i] && save[i] != '\n')
	{
		line[i] = save[i];
		i++;
	}
	if (save[i] == '\n')
		line[i++] = '\n';
	line[i] = '\0';
	return (line);
}

static char	*read_and_save(int fd, char *save)
{
	char	*buffer;
	int		read_a;

	read_a = 1;
	buffer = malloc(BUFFER_SIZE + 1);
	if (!buffer)
		return (NULL);
	while (read_a > 0)
	{
		read_a = read(fd, buffer, BUFFER_SIZE);
		if (read_a <= 0)
			break ;
		buffer[read_a] = '\0';
		save = ft_strjoin_gnl(save, buffer);
		if (!save)
			return (free(buffer), NULL);
		if (has_newline(save))
			break ;
	}
	return (free(buffer), save);
}

char	*get_next_line(int fd)
{
	char			*line;
	static char		*save;

	if (fd < 0 || BUFFER_SIZE <= 0)
		return (NULL);
	save = read_and_save(fd, save);
	if (!save)
		return (NULL);
	line = get_line(save);
	if (!line)
		return (free(save), NULL);
	save = update_save(save);
	if (!save && !line[0])
		return (free(line), NULL);
	return (line);
}
/* int	main(int argc, char *argv[])
{
	char	*str;
	int		fd;
    (void)argc;
	(void)argv;
	fd = open("prueba.txt", O_RDONLY);
	while ((str = get_next_line(fd)) != NULL)
 	{
 		printf("%s", str);
 		free (str);
 	}
	close(fd);
} */