get_next_line.c

#include "get_next_line.h"

t_list	*check_fd(t_list *list, int fd)
{
	while (list)
	{
		if (list->fd == fd)
			return (list);
		list = list->next;
	}
	return (NULL);
}

t_list	*ft_lstadd_front(t_list **lst, t_list *new)
{
	if (lst)
		new->next = *lst;
	*lst = new;
	return (*lst);
}

t_list	*new_list(int fd)
{
	t_list	*list;

	list = (t_list *)malloc(sizeof(t_list));
	if (fd < 0 || !(list))
		return (NULL);
	list->fd = fd;
	list->content = ft_strdup("");
	list->next = NULL;
	return (list);
}

int		get_base_line(char **line, t_list *temp_list, t_list **static_list)
{
	int		len;
	char	*remains;
	t_list	*tmp_static;

	tmp_static = *static_list;
	if (!ft_strchr(temp_list->content, '\n'))
	{
		*line = ft_strdup(temp_list->content);
		if (tmp_static != temp_list)
		{
			while (tmp_static->next && tmp_static->next->fd != temp_list->fd)
				tmp_static = tmp_static->next;
			tmp_static->next = temp_list->next;
		}
		free(temp_list->content);
		free(temp_list);
		*static_list = (tmp_static == temp_list) ? NULL : tmp_static;
		return (0);
	}
	len = (int)(ft_strchr(temp_list->content, '\n') - temp_list->content);
	*line = ft_substr(temp_list->content, 0, len);
	remains = ft_strdup(temp_list->content + len + 1);
	free(temp_list->content);
	temp_list->content = remains;
	return (1);
}

int		get_next_line(int fd, char **line)
{
	static t_list	*list;
	t_list			*temp_list;
	char			buff[BUFFER_SIZE];
	int				count;

	count = 0;
	if (!line || BUFFER_SIZE <= 0 || read(fd, buff, 0) < 0)
		return (-1);
	if (!list && !(list = new_list(fd)))
		return (-1);
	temp_list = check_fd(list, fd);
	if (!(temp_list) && !(temp_list = ft_lstadd_front(&list, new_list(fd))))
		return (-1);
	while (!(ft_strchr(temp_list->content, '\n')) &&
			(count = read(fd, buff, BUFFER_SIZE)) > 0)
	{
		buff[count] = '\0';
		temp_list->content = ft_strjoin(temp_list->content, buff, 1);
	}
	return (get_base_line(line, temp_list, &list));
}