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: 2022/10/26 01:53:25 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "get_next_line.h"

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

	str = ft_calloc(BUFFER_SIZE, 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' && c != '\0')
		return (-1);
	return (i);
}

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

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

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

	if (ft_strchr(stash, '\n') == -1)
	{
		buf1 = ft_getline(fd);
		if (buf1 == NULL)
			return (NULL);
		stash = ft_realloc(stash, ft_strchr(buf1, 0) + ft_strchr(stash, 0) + 2);
		if (stash == NULL)
			return (NULL);
		ft_strfcat(stash, buf1);
	}
	buf1 = ft_strndup(stash, ft_strchr(stash, '\n') + 1);
	buf2 = ft_strndup(stash + ft_strchr(stash, '\n') + 1, ft_strchr(stash, 0));
	free(stash);
	stash = buf2;
	if (stash == NULL || buf1 == NULL)
	{
		free(stash);
		free(buf1);
		return (NULL);
	}
	return (buf1);
}