/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   e_pipes_next.c                                     :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rbousset <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/02/14 17:19:27 by rbousset          #+#    #+#             */
/*   Updated: 2020/02/14 17:19:29 by rbousset         ###   ########lyon.fr   */
/*                                                                            */
/* ************************************************************************** */

#include <libft.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>

#include "e_redirs.h"
#include "e_unshebanged.h"
#include "f_fail.h"
#include "s_com.h"
#include "s_destroy.h"
#include "s_line.h"
#include "s_lpipes.h"
#include "s_struct.h"
#include "u_utils.h"
#include "u_utils.h"

static void	e_fullpath_not_found(t_com *ptr, t_msh *msh)
{
	f_command_not_found(ptr->bin);
	u_eof_fd(msh->fd);
	s_com_destroy(&msh->com);
	s_lpipes_clear(&msh->pipes);
	s_line_clear(&msh->curr);
	s_destroy(msh);
	exit(127);
}

static void	e_exec_child(const char fullpath[], t_com *ptr, t_msh *msh)
{
	if (execve(fullpath, ptr->argv, msh->envp) == -1)
	{
		if (errno != ENOEXEC)
		{
			f_exec(fullpath, ptr->bin);
			u_eof_fd(msh->fd);
			s_com_destroy(&msh->com);
			s_lpipes_clear(&msh->pipes);
			s_line_clear(&msh->curr);
			s_destroy(msh);
			exit(errno);
		}
		e_extern_read_script(fullpath, ptr, msh, FALSE);
	}
}

void		e_pipe_child(char fullpath[],
						unsigned char fp_ret,
						t_com *ptr,
						t_msh *msh)
{
	unsigned char	bu_id;
	unsigned char	ret;

	e_dup_redirs(ptr, msh);
	if (ft_strncmp(fullpath, "builtin", 8) == 0)
	{
		bu_id = u_get_builtin_id(ptr->bin);
		ret = msh->bu_ptr[bu_id](ptr->argv + 1, msh);
		u_eof_fd(msh->fd);
		s_com_destroy(&msh->com);
		s_lpipes_clear(&msh->pipes);
		s_line_clear(&msh->curr);
		s_destroy(msh);
		exit(ret);
	}
	else
	{
		if (fp_ret == 2)
			e_fullpath_not_found(ptr, msh);
		e_exec_child(fullpath, ptr, msh);
	}
}

size_t		e_get_pipes_count(struct s_lpipes *ptr)
{
	struct s_lpipes	*rptr;
	size_t			pipes;

	rptr = ptr;
	pipes = 0;
	while (rptr->next != NULL)
	{
		rptr = rptr->next;
		pipes++;
	}
	return (pipes);
}

void		e_close_unused_fds(int fd[256][2], size_t pipes)
{
	size_t	i;

	i = 0;
	while (i < pipes && i < 255)
	{
		close(fd[i][E_WRITE_END]);
		close(fd[i][E_READ_END]);
		i++;
	}
}