heredoc.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   heredoc.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: baelgadi <baelgadi@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/12/12 21:58:03 by baelgadi          #+#    #+#             */
/*   Updated: 2026/03/09 23:26:19 by baelgadi         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include <readline/readline.h>
#include <stdio.h>
#include "executor.h"
#include "token.h"
#include "env.h"
#include "signals.h"
#include "libft.h"
#include "get_next_line.h"
 
static void write_heredoc_line(int fd, char *line, t_shell *shell, int expand)
{
    char    *expanded;
 
    if (expand && line)
    {
        expanded = expand_variables(line, shell->env, QUOTE_NONE,
                shell->exit_status);
        ft_putendl_fd(expanded, fd);
        free(expanded);
    }
    else
        ft_putendl_fd(line, fd);
}
 
static char *read_heredoc_line(void)
{
    char    *line;
    size_t  len;
 
    if (isatty(STDIN_FILENO))
        return (readline("> "));
    line = get_next_line(STDIN_FILENO);
    if (!line)
        return (NULL);
    len = ft_strlen(line);
    if (len > 0 && line[len - 1] == '\n')
        line[len - 1] = '\0';
    return (line);
}
 
static void print_heredoc_eof_error(char *delim)
{
    ft_putstr_fd("minishell: warning: here_document delimited by", 2);
    ft_putstr_fd(" end-of-file (wanted `", 2);
    ft_putstr_fd(delim, 2);
    ft_putstr_fd("')\n", 2);
}
 
static int  read_heredoc_lines(int fd, char *delim, t_shell *shell, int expand)
{
    char    *line;
 
    while (1)
    {
        line = read_heredoc_line();
        if (g_signal == SIGINT)
        {
            free(line);
            return (1);
        }
        if (!line)
        {
            print_heredoc_eof_error(delim);
            return (0);
        }
        if (!ft_strncmp(line, delim, -1))
        {
            free(line);
            return (0);
        }
        write_heredoc_line(fd, line, shell, expand);
        free(line);
    }
}
 
int handle_heredoc(char *delimiter, int quoted, t_shell *shell)
{
    int     pipe_fd[2];
    int     expand;
    int     interrupted;
 
    expand = !quoted;
    if (pipe(pipe_fd) == -1)
        return (perror("minishell: pipe"), -1);
    setup_heredoc_signals();
    g_signal = 0;
    interrupted = read_heredoc_lines(pipe_fd[1], delimiter, shell, expand);
    setup_interactive_signals();
    close(pipe_fd[1]);
    if (interrupted)
    {
        close(pipe_fd[0]);
        restore_stdin();
        return (-1);
    }
    return (pipe_fd[0]);
}