Initial commit

Makefile

@@ -0,0 +1,36 @@
+# **************************************************************************** #
+#                                                                              #
+#                                                         :::      ::::::::    #
+#    Makefile                                           :+:      :+:    :+:    #
+#                                                     +:+ +:+         +:+      #
+#    By: lejulien <marvin@42.fr>                    +#+  +:+       +#+         #
+#                                                 +#+#+#+#+#+   +#+            #
+#    Created: 2020/07/05 18:43:38 by lejulien          #+#    #+#              #
+#    Updated: 2021/07/26 05:54:14 by lejulien         ###   ########.fr        #
+#                                                                              #
+# **************************************************************************** #
+
+SRCS = 	./main.c
+
+SRCS_OBJS = ${SRCS:.c=.o}
+
+FLAGS = -Wall -Wextra -Werror -lpthread
+
+.c.o:
+	gcc -c $< -o $(<:.c=.o)
+
+NAME = macroshell
+
+$(NAME): $(SRCS_OBJS)
+	gcc -o $(NAME) $(SRCS_OBJS) $(FLAGS)
+
+clean:
+	rm -f $(SRCS_OBJS)
+
+fclean: clean
+	rm -f $(NAME)
+
+re: fclean $(NAME)
+
+.PHONY: clean fclean re
+

main.c

@@ -0,0 +1,146 @@
+//
+//	Made by lejulien
+//
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+
+int
+	ft_strlen(char *str)
+{
+	int i = 0;
+	while (str[i])
+		i++;
+	return (i);
+}
+
+int
+	ft_put_error(char *str)
+{
+	write(2, str, ft_strlen(str));
+	return (1);
+}
+
+char
+	*get_next_sep(char **av)
+{
+	int i = 0;
+	while (av[i] && strcmp(av[i], "|") != 0 && strcmp(av[i], ";") != 0)
+		i++;
+	return (av[i]);
+}
+
+int
+	get_next_sep_pos(char **av)
+{
+	int i = 0;
+	while (av[i] && strcmp(av[i], "|") != 0 && strcmp(av[i], ";") != 0)
+		i++;
+	return (i);
+}
+
+int
+	get_next_cmd(char **av)
+{
+	int i = 0;
+	while (av[i] && strcmp(av[i], "|") != 0 && strcmp(av[i], ";") != 0)
+		i++;
+	while (av[i] && (strcmp(av[i], "|") == 0 || strcmp(av[i], ";") == 0))
+		i++;
+	return (i);
+}
+
+void
+	do_cd(char **av)
+{
+	if (av[1] && strcmp(av[1], "|") != 0 && strcmp(av[1], ";") != 0)
+	{
+		if (av[2] == NULL || (av[2] && strcmp(av[2], ";") == 0))
+		{
+			if (chdir(av[1]) < 0)
+			{
+				ft_put_error("error: cd: canot chang directory to ");
+				ft_put_error(av[1]);
+				ft_put_error("\n");
+			}
+		}
+		else
+			ft_put_error("error: cd: bad arguments");
+	}
+	else
+		ft_put_error("error: cd: bad arguments");
+}
+
+int		pip[2];
+int		prev_pip[2];
+void
+	exec(char **av, char **envp)
+{
+	pid_t	pid;
+	int		status;
+	int		is_pipe = 0;
+	int		ret;
+	char	*tmp;
+
+	if (get_next_sep(av) != NULL &&  strcmp(get_next_sep(av), "|") == 0)
+	{
+		if (pipe(pip))
+			exit(ft_put_error("error: fatal\n"));
+		is_pipe = 1;
+	}
+	if ((pid = fork()) < 0)
+		exit(ft_put_error("error: fatal\n"));
+	if (pid == 0)
+	{
+		if (is_pipe)
+		{
+			if (dup2(pip[1], 1) < 0)
+				exit(ft_put_error("error: fatali\n"));
+		}
+		if (strcmp(av[-1], "|") == 0)
+		{
+			if (dup2(prev_pip[0], 0) < 0)
+				exit(ft_put_error("error: fatal\n"));
+		}
+		tmp = get_next_sep(av);
+		av[get_next_sep_pos(av)] = NULL;
+		if ((ret = execve(*av, av, envp)) == -1)
+		{
+			ft_put_error("error: cannot execute ");
+			ft_put_error(*av);
+			exit(ft_put_error("\n"));
+		}
+		av[get_next_sep_pos(av)] = tmp;
+	}
+	else
+	{
+		if (is_pipe)
+			close(pip[1]);
+		if (strcmp(av[-1], "|") == 0)
+			close(prev_pip[0]);
+		waitpid(pid, &status, 0);
+	}
+	prev_pip[0] = pip[0];
+	prev_pip[1] = pip[1];
+	is_pipe = 0;
+}
+
+int
+	main(int ac, char **av, char **envp)
+{
+	av = &av[1];
+
+	while (*av)
+	{
+		if (strcmp(*av, "cd") == 0)
+			do_cd(av);
+		else
+			exec(av, envp);
+		av = &av[get_next_cmd(av)];
+	}
+	return (0);
+}
+
+//	Made by lejulien@42