redirect_in.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   redirect_in.c                                      :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: dmdemirk <dmdemirk@student.42london.c      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/07/11 14:32:40 by dmdemirk          #+#    #+#             */
/*   Updated: 2024/11/08 13:14:21 by dmdemirk         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "tokens.h"
#include "shell.h"
#include "redirection.h"
#include "execute.h"
#include <string.h>
#include <sys/wait.h>
 
int redirect_in(t_ast *node, t_ms_data *data);
 
static int  setup_redirection(t_ast *node, int *original_stdin)
{
    int fd;
 
    *original_stdin = dup(STDIN_FILENO);
    if (*original_stdin == -1)
        return (-1);
    fd = open_file(node->right, "<");
    if (fd == -1)
    {
        close(*original_stdin);
        return (-1);
    }
    if (dup2(fd, STDIN_FILENO) == -1)
    {
        close(fd);
        close(*original_stdin);
        return (-1);
    }
    close(fd);
    return (EXIT_SUCCESS);
}
 
int redirect_in(t_ast *node, t_ms_data *data)
{
    int status;
    int original_stdin;
 
    if (setup_redirection(node, &original_stdin) == -1)
        return (EXIT_FAILURE);
    if (!node->left->args[0])
        status = EXIT_SUCCESS;
    else
        status = execute_ast(node->left, data);
    if (dup2(original_stdin, STDIN_FILENO) == -1)
        status = EXIT_FAILURE;
    close(original_stdin);
    return (status);
}