42_minishell/redirection/infile.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   infile.c                                           :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/02/15 17:52:10 by cchauvet          #+#    #+#             */
/*   Updated: 2023/02/20 13:05:43 by starnakin        ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "./redirection_private.h"

static int	ft_infile_is_valid(t_data *data, const char *line)
{
	char	**tab;
	char	*path;
	ssize_t	i;
	int		return_code;

	tab = ft_split_quoted(line, ' ');
	if (tab == NULL)
	{
		ft_eprintf("minishell: malloc failed\n");
		return (0);
	}
	if (tab[0] == NULL)
		return (1);
	return_code = 1;
	i = -1;
	while (tab[++i] != NULL && return_code == 1)
	{
		if (tab[i][0] == '<')
		{
			if (ft_strcmp(tab[i], "<") == 0)
			{
				path = ft_env_filler(data, tab[i + 1]);
				if (path == NULL)
					return_code = 0;
				ft_quote_remover(path);
				free(tab[i + 1]);
				tab[i + 1] = path;
				if (ft_file_is_readable(tab[i + 1]) == 0)
				{
					data->exit_code = 1;
					return_code = -1;
				}
			}
			if (ft_contain_only_str(tab[i + 1], "| <>"))
				return_code = 0;
		}
	}
	if (return_code == 0)
		ft_eprintf("minishell: %s: must be followed by an infile\n", tab[i]);
	ft_freer_tab_ultimate(1, tab);
	return (return_code);
}

static int	ft_get_infile(t_data *data, const char *line)
{
	size_t	i;
	int		fd;
	char	**tab;
	char	*path;

	tab = ft_split_quoted(line, ' ');
	if (tab == NULL)
	{
		ft_eprintf("minishell: malloc failed\n");
		return (-2);
	}
	fd = -1;
	i = 0;
	while (tab[i + 1] != NULL)
	{
		if (tab[i][0] == '<')
			if (fd != 0)
				close(fd);
		if (ft_strcmp("<", tab[i]) == 0)
		{
			path = ft_env_filler(data, tab[i + 1]);
			if (path == NULL)
				return (-2);
			ft_quote_remover(path);
			fd = open(path, O_RDONLY);
			free(path);
		}
		else if (ft_strcmp("<<", tab[i]) == 0)
			fd = ft_heredoc(data, ft_quote_remover(tab[i + 1]));
		i++;
	}
	ft_freer_tab_ultimate(1, tab);
	return (fd);
}

static int	ft_remove_infile(char *line)
{
	size_t	i;
	size_t	y;
	char	**tab;

	tab = ft_split_quoted(line, ' ');
	if (tab == NULL)
	{
		ft_eprintf("minishell: malloc failed\n");
		return (1);
	}
	i = 0;
	y = 0;
	while (tab[i] != NULL)
	{
		if (tab[i][0] == '<')
		{
			ft_strshift(line + y,
			(-1) * (ft_strlen(tab[i]) + ft_strlen(tab[i + 1]) + 1 + (line[ft_strlen(tab[i]) + ft_strlen(tab[i + 1]) + 1] != '\0')));
			i++;
		}
		else
			y = y + ft_strlen(tab[i]) + (y != 0);
		i++;
	}
	ft_freer_tab_ultimate(1, tab);
	return (0);
}

int	ft_infile(t_data *data, char *line)
{
	int	fd;

	if (ft_infile_is_valid(data, line) == 0)
		return (-2);
	fd = ft_get_infile(data, line);
	if (fd == -2)
		return (-2);
	ft_remove_infile(line);
	return (fd);
}