#include <unistd.h>		// write, fork, execve, pipe
#include <stdio.h>		// printf
#include <string.h>		// strcmp
#include <sys/types.h>	// pid_t
#include <sys/wait.h>	// waitpid

#define STDIN	0
#define STDOUT	1
#define STDERR	2

void	print_cmd(char **av)
{
	int i;
	int size;

	i = 0;
	while (av[i])
	{
		size = 0;
		while (av[i][size] != '\0')
			size++;
		write(1, av[i], size);
		write(1, " ", 1);
		i++;
	}
	write(1, "\n", 1);
}

//void	exec_cmd(char **av, int end, char **en)
void	exec_cmd(char **av, char **en)
{
	pid_t	pid = fork();

//	av[end] = NULL;
	if (pid == 0)	// child process
	{
		execve(av[0], av, en);
	}
	else			// parent process
	{
		waitpid(pid, NULL, 0);
	}
}

int	main(int ac, char **av, char **en)
{
	int i;
	int start;

	if (ac <= 1)
		return (0);
	i = 1;
	while (i < ac)
	{
		start = i;
		while (i < ac && strcmp(av[i], "|") && strcmp(av[i], ";"))
			i++;
		av[i] = NULL;
//		print_cmd(&av[start]);
		exec_cmd(&av[start], en);
		if (i < ac)
			i++;
	}
	return (0);
}

// https://www.rozmichelle.com/pipes-forks-dups/