executor_redir.c

Go to the documentation of this file.

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   executor_redir.c                                   :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: baelgadi <baelgadi@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/12/17 18:56:14 by zotaj-di          #+#    #+#             */
/*   Updated: 2026/03/04 04:50:27 by baelgadi         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include <fcntl.h>
#include <stdio.h>
#include "executor.h"
#include "libft.h"
 
int open_redir_file(char *file, t_node_type type)
{
    int fd;
 
    fd = -1;
    if (type == NODE_REDIR_IN)
        fd = open(file, O_RDONLY);
    else if (type == NODE_REDIR_OUT)
        fd = open(file, O_WRONLY | O_CREAT | O_TRUNC, 0644);
    else if (type == NODE_REDIR_APPEND)
        fd = open(file, O_WRONLY | O_CREAT | O_APPEND, 0644);
    if (fd == -1)
    {
        ft_putstr_fd("minishell: ", STDERR_FILENO);
        perror(file);
    }
    return (fd);
}
 
int setup_redirection(int fd, t_node_type type)
{
    int saved_fd;
    int target;
 
    if (type == NODE_REDIR_IN || type == NODE_REDIR_HEREDOC)
        target = STDIN_FILENO;
    else
        target = STDOUT_FILENO;
    saved_fd = dup(target);
    if (saved_fd == -1)
    {
        perror("minishell: error on dup");
        return (-1);
    }
    if (dup2(fd, target) == -1)
    {
        close(saved_fd);
        perror("minishell: error on dup2");
        return (-1);
    }
    close(fd);
    return (saved_fd);
}
 
void    restore_fd(int saved_fd, t_node_type type)
{
    int target;
 
    if (saved_fd == -1)
        return ;
    if (type == NODE_REDIR_IN || type == NODE_REDIR_HEREDOC)
        target = STDIN_FILENO;
    else
        target = STDOUT_FILENO;
    dup2(saved_fd, target);
    close(saved_fd);
}
 
int handle_redir(t_ast *node, t_shell *shell)
{
    t_redir_node    *redir;
    int             fd;
    int             saved_fd;
    int             status;
 
    redir = &node->data.redir;
    if (node->type == NODE_REDIR_HEREDOC && redir->heredoc_fd >= 0)
    {
        fd = redir->heredoc_fd;
        redir->heredoc_fd = -1;
    }
    else
        fd = open_redir_file(redir->file, node->type);
    if (fd == -1)
        return (1);
    saved_fd = setup_redirection(fd, node->type);
    if (saved_fd == -1)
    {
        close(fd);
        return (1);
    }
    status = executor(redir->cmd, shell);
    restore_fd(saved_fd, node->type);
    return (status);
}