1 files changed, 98 insertions, 0 deletions
diff --git a/src/eval/cmd.c b/src/eval/cmd.c
new file mode 100644
index 0000000..9468cb2
--- /dev/null
+++ b/src/eval/cmd.c
@@ -0,0 +1,98 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   cmd.c                                              :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: charles <charles.cabergs@gmail.com>        +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/06/14 10:41:31 by charles           #+#    #+#             */
+/*   Updated: 2020/06/15 11:09:38 by charles          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "eval.h"
+
+/*
+** \brief          Wrap a function in a fork
+** \param fd_in    fork input file descriptor
+** \param fd_out   fork output file descriptor
+** \param passed   param of the wrapped function
+** \param wrapped  function to wrap
+*/
+
+int			fork_wrap(
+				int	fd_in,
+				int fd_out,
+				void *passed,
+				int (*wrapped)(void *param))
+{
+	int		status;
+	pid_t	child_pid;
+
+	if ((child_pid = fork()) == -1)
+		return (-1);
+	if (child_pid == 0)
+	{
+		if ((fd_in != MS_NO_FD && dup2(fd_in, STDIN_FILENO) == -1) ||
+			(fd_out != MS_NO_FD && dup2(fd_out, STDOUT_FILENO) == -1))
+			exit(EXIT_FAILURE);
+		if ((status = wrapped(passed)) == -1)
+			exit(EXIT_FAILURE);
+		exit(status);
+	}
+	wait(&child_pid);
+	return (WEXITSTATUS(child_pid));
+}
+
+int 		forked_cmd(void *void_param)
+{
+	t_fork_param_cmd	*param;
+
+	param = void_param;
+
+	if (param->builtin != NULL)
+		return (param->builtin(param->argv, param->env));
+	else
+		return (execve(param->exec_path, param->argv, (char**)param->env->data));
+}
+
+int		eval_cmd(t_env env, t_path path, t_ast *ast)
+{
+	t_fork_param_cmd	param;
+	int					fd_in;
+	int					fd_out;
+	char				**argv;
+
+	fd_in = MS_NO_FD;
+	fd_out = MS_NO_FD;
+	if (!redir_extract(ast->redirs, env, &fd_in, &fd_out))
+	{
+		ast->redirs = NULL;
+		return (-1);
+	}
+	ast->redirs = NULL;
+
+	if ((argv = preprocess(&ast->cmd_argv, env)) == NULL)
+	{
+		ast->cmd_argv = NULL;
+		return (-1);
+	}
+
+	param.builtin = builtin_search_func(argv[0]);
+	if (param.builtin == NULL)
+	{
+		param.exec_path = exec_search_path(path, env_search(env, "PATH"), argv[0]);
+		if (param.exec_path == NULL)
+		{
+			error_eval_put(ERROR_CMD_NOT_FOUND, argv[0]);
+			ft_split_destroy(argv);
+			return (-1); // return error status
+		}
+	}
+
+	param.argv = argv;
+	param.env = env;
+	int ret = fork_wrap(fd_in, fd_out, &param, &forked_cmd);
+	ft_split_destroy(argv);
+	return (ret);
+}