get_next_line.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: tgiraudo <tgiraudo@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/11/11 12:09:46 by tgiraudo          #+#    #+#             */
/*   Updated: 2022/11/23 10:55:37 by tgiraudo         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include"get_next_line.h"

char	*ft_free(char *save, char *buffer)
{
	char	*temp;

	temp = ft_strjoin(save, buffer);
	free(save);
	return (temp);
}

char	*ft_line(char *save)
{
	int		i;
	char	*line;

	i = 0;
	if (!save[i])
		return (NULL);
	while (save[i] && save[i] != '\n')
		i++;
	line = ft_calloc(i + 2, sizeof(char));
	i = 0;
	while (save[i] && save[i] != '\n')
	{
		line[i] = save[i];
		i++;
	}
	if (save[i] == '\n')
		line[i++] = '\n';
	return (line);
}

char	*ft_next_line(char *save)
{
	int		i;
	int		j;
	char	*next_line;

	i = 0;
	while (save[i] && save[i] != '\n')
		i++;
	if (!save[i])
	{
		free (save);
		return (NULL);
	}
	next_line = ft_calloc(ft_strlen(save) - i + 1, sizeof(char));
	i++;
	j = 0;
	while (save[i])
	{
		next_line[j] = save[i++];
		j++;
	}
	free(save);
	return (next_line);
}

char	*ft_read_buf(char *save, int fd)
{
	char	*buffer;
	int		size;

	buffer = ft_calloc(BUFFER_SIZE + 1, sizeof(char));
	size = 1;
	while (size && !new_line(save))
	{
		size = read(fd, buffer, BUFFER_SIZE);
		if (size < 0)
		{
			free(buffer);
			return (NULL);
		}
		buffer[size] = '\0';
		save = ft_free(save, buffer);
	}
	free(buffer);
	return (save);
}

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

	if (fd < 0 || read(fd, 0, 0) < 0 || BUFFER_SIZE <= 0)
		return (NULL);
	if (!save)
		save = ft_calloc(1, sizeof(char));
	save = ft_read_buf(save, fd);
	if (!save)
		return (NULL);
	line = ft_line(save);
	save = ft_next_line(save);
	return (line);
}