1 files changed, 75 insertions, 0 deletions
diff --git a/src/eval/eval.c b/src/eval/eval.c
new file mode 100644
index 0000000..d35d491
--- /dev/null
+++ b/src/eval/eval.c
@@ -0,0 +1,75 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   eval.c                                             :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: charles <me@cacharle.xyz>                  +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/09/13 20:38:06 by charles           #+#    #+#             */
+/*   Updated: 2020/09/13 20:45:20 by charles          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "eval.h"
+
+/*
+** \brief            Wrap a function in a fork
+** \param fds        fork read/write file descriptors
+** \param passed     param of the wrapped function
+** \param wrapped    function to wrap
+** \param child_pid  Pointer where to store the child pid
+**                   or NULL if the child should be waited
+** \return           The child status code or EVAL_FATAL on error
+*/
+
+int			fork_wrap(
+	int fds[2],
+	void *passed,
+	int (*wrapped)(void *param),
+	pid_t *child_pid
+)
+{
+	int		status;
+	bool	waiting;
+	pid_t	pid;
+
+	waiting = child_pid == NULL;
+	if (waiting)
+		child_pid = &pid;
+	if ((*child_pid = fork()) == -1)
+		return (EVAL_FATAL);
+	if (*child_pid == 0)
+	{
+		if ((fds[FD_READ] != FD_NONE && dup2(fds[FD_READ], STDIN_FILENO) == -1) ||
+			(fds[FD_WRITE] != FD_NONE && dup2(fds[FD_WRITE], STDOUT_FILENO) == -1))
+			exit(EXIT_FAILURE);
+		if ((status = wrapped(passed)) == EVAL_FATAL) // FIXME detect fatal in child (pipe ?)
+			exit(EXIT_FAILURE);
+		exit(status);
+	}
+	g_child_pid = *child_pid;
+	if (waiting)
+	{
+		waitpid(*child_pid, child_pid, 0);
+		close(fds[FD_WRITE]);
+		/* close(fds[FD_READ]); */
+		return (WEXITSTATUS(*child_pid));
+	}
+	return (0);
+}
+
+/*
+** \brief    Evaluate and AST
+** \return   The last command status or EVAL_FATAL on error
+*/
+
+int			eval(int fds[2], t_env env, t_path path, t_ast *ast, pid_t *child_pid)
+{
+	if (ast->tag == AST_PARENT)
+		return (eval_parenthesis(fds, env, path, ast));
+	if (ast->tag == AST_OP)
+		return (eval_operation(fds, env, path, ast));
+	if (ast->tag == AST_CMD)
+		return (eval_cmd(fds, env, path, ast, child_pid));
+	return (EVAL_FATAL);
+}