42_minishell/redirection/file.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   file.c                                             :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cchauvet <cchauvet@student.42angoulem      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/02/15 17:36:11 by cchauvet          #+#    #+#             */
/*   Updated: 2023/02/15 17:41:13 by cchauvet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "./redirection_private.h"

int	ft_file_is_readable(t_data *data, const char *path)
{
	int	readable;
	int	fd;

	fd = open(path, O_RDONLY);
	if (fd == -1)
	{
		data->exit_code = 1;
		ft_eprintf("minishell: %s: No such file or directory\n", path);
		return (0);
	}
	readable = read(fd, "", 0);
	if (readable == -1)
	{
		data->exit_code = 1;
		ft_eprintf("minishell: %s: Permission denied\n", path);
		return (0);
	}
	close(fd);
	return (1);
}

int	ft_file_is_writable(t_data *data, const char *path)
{
	int	writeable;
	int	fd;

	fd = open(path, O_WRONLY | O_TRUNC | O_CREAT, 0644);
	if (fd == -1)
	{
		data->exit_code = 1;
		ft_eprintf("minishell: %s: Permission denied\n", path);
		return (0);
	}
	writeable = write(fd, "", 0);
	if (writeable == -1)
	{
		data->exit_code = 1;
		ft_eprintf("minishell: %s: Permission denied\n", path);
		return (0);
	}
	return (fd);
}

int	ft_file_is_appendable(t_data *data, const char *path)
{
	int	writeable;
	int	fd;

	fd = open(path, O_WRONLY | O_APPEND | O_CREAT, 0644);
	if (fd == -1)
	{
		data->exit_code = 1;
		ft_eprintf("minishell: %s: Permission denied\n", path);
		return (0);
	}
	writeable = write(fd, "", 0);
	if (writeable == -1)
	{
		data->exit_code = 1;
		ft_eprintf("minishell: %s: Permission denied\n", path);
		return (0);
	}
	return (fd);
}