42_get_next_line/get_next_line.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   get_next_line.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2022/10/26 00:52:47 by cchauvet          #+#    #+#             */
/*   Updated: 2022/10/28 13:37:18 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"

char	*ft_getstash(int fd)
{
	char	*str;
	int		readed;

	str = ft_calloc(BUFFER_SIZE + 1, sizeof(char));
	if (str == NULL)
		return (NULL);
	readed = read(fd, str, BUFFER_SIZE);
	if (readed < 0)
	{
		free(str);
		return (NULL);
	}
	return (str);
}

ssize_t	ft_strchr(char *str, char c)
{
	size_t	i;

	if (str == NULL)
		return (-1);
	i = 0;
	while (str[i] != c && str[i] != '\0')
		i++;
	if (str[i] == '\0')
		return (-1);
	return (i);
}

char	*ft_getline(int fd)
{
	char		*stash;
	char		*buf;
	size_t		i;

	stash = NULL;
	buf = NULL;
	i = 0;
	while (ft_strchr(stash + i, '\n') == -1)
	{
		i = i + ft_strlen(buf);
		buf = ft_getstash(fd);
		if (buf == NULL)
			return (NULL);
		if (buf[0] == '\0')
		{
			free(buf);
			break ;
		}
		stash = ft_strfjoin(stash, buf);
		if (stash == NULL)
			return (NULL);
	}
	return (stash);
}

char	*get_next_line(int fd)
{
	static char	*stash = NULL;
	char		*buf1;
	char		*buf2;

	buf2 = stash;
	if (ft_strchr(stash, '\n') == -1)
	{
		buf1 = ft_getline(fd);
		if (buf1 == NULL)
			return (NULL);
		buf2 = ft_strfjoin(stash, buf1);
		if (buf2 == NULL)
			return (NULL);
	}
	buf1 = ft_strndup(buf2, ft_strchr(buf2, '\n') + 1);
	stash = ft_strndup(buf2 + ft_strchr(buf2, '\n') + 1, ft_strlen(buf2));
	free(buf2);
	if (stash == NULL || buf1 == NULL)
	{
		free(stash);
		free(buf1);
		return (NULL);
	}
	return (buf1);
}