redirect.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        ::::::::            */
/*   redirect.c                                         :+:    :+:            */
/*                                                     +:+                    */
/*   By: sde-rijk <sde-rijk@student.codam.nl>         +#+                     */
/*                                                   +#+                      */
/*   Created: 2021/12/13 09:57:22 by sde-rijk      #+#    #+#                 */
/*   Updated: 2022/01/24 13:52:20 by sde-rijk      ########   odam.nl         */
/*                                                                            */
/* ************************************************************************** */

#include "minishell.h"
#include "Libft/libft.h"
#include <fcntl.h>
#include <stdio.h>

static int	ft_set_fd(char *part, int fd, t_env *s_env);

int	ft_do_redir(t_part *parts, t_env *s_env, int i)
{
	int	fd;

	if (!parts[i + 1].part)
		return (ft_syntax_error(parts, 0, s_env, "newline"));
	if (parts[i + 1].type == SPECIAL)
		return (ft_syntax_error(parts, 0, s_env, parts[i + 1].part));
	if (!ft_strcmp(parts[i].part, "<<"))
		return (here_doc(parts[i + 1].part, s_env, parts));
	if (!ft_strcmp(parts[i].part, "<"))
		fd = open(parts[i + 1].part, O_RDONLY);
	else if (!ft_strcmp(parts[i].part, ">"))
		fd = open(parts[i + 1].part, O_RDWR | O_CREAT | O_TRUNC, 0644);
	else
		fd = open(parts[i + 1].part, O_RDWR | O_CREAT | O_APPEND, 0644);
	if (fd < 0)
		return (ft_redir_error(SHELL_NAME, parts[i + 1].part, s_env));
	return (ft_set_fd(parts[i].part, fd, s_env));
}

static int	ft_set_fd(char *part, int fd, t_env *s_env)
{
	if (!ft_strcmp(part, "<"))
	{
		if (dup2(fd, STDIN_FILENO) < 0)
			return (ft_redir_error("dup2", "", s_env));
	}
	else
	{
		if (dup2(fd, STDOUT_FILENO) < 0)
			return (ft_redir_error("dup2", "", s_env));
	}
	return (0);
}