Refactoring redirection out of eval/cmd.c, Added tag check shortcut

1 files changed, 80 insertions, 0 deletions

diff --git a/src/eval/redir.c b/src/eval/redir.c
new file mode 100644
index 0000000..c6f98d4
--- /dev/null
+++ b/src/eval/redir.c
@@ -0,0 +1,80 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   redir.c                                            :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: charles <charles.cabergs@gmail.com>        +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2020/06/15 11:05:34 by charles           #+#    #+#             */
+/*   Updated: 2020/06/15 11:44:38 by charles          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "eval.h"
+
+static enum e_token_tag	st_lst_tag(t_ftlst *lst)
+{
+	return (((t_token*)lst->data)->tag);
+}
+
+static bool				st_open_replace(int *fd, char *filename, int oflag)
+{
+	if (*fd != MS_NO_FD)
+		close(*fd);
+	if (oflag & O_CREAT)
+		*fd = open(filename, oflag, 0644);
+	else
+		*fd = open(filename, oflag);
+	if (*fd == -1)
+	{
+		error_eval_put(ERROR_OPEN, filename);
+		free(filename);
+		return (false);
+	}
+	return (true);
+}
+
+bool					redir_extract(
+		t_ftlst *redirs,
+		t_env env,
+		int *fd_in,
+		int *fd_out)
+{
+	t_ftlst	*after;
+	t_ftlst	*curr;
+	char	*filename;
+
+	if (redirs == NULL)
+		return (true);
+	if (!(st_lst_tag(redirs) & TAG_IS_REDIR) || redirs->next == NULL
+		|| !(st_lst_tag(redirs->next) & TAG_IS_STR))
+		return (false);
+	curr = redirs->next;
+	while (curr != NULL && st_lst_tag(curr) & TAG_IS_STR)
+	{
+		if (curr->next == NULL || st_lst_tag(curr->next) & TAG_IS_REDIR)
+		{
+			after = curr->next;
+			curr->next = NULL;
+		}
+		curr = curr->next;
+	}
+	if ((filename = preprocess_filename(&redirs->next, env)) == NULL)
+	{
+		token_destroy_lst2(redirs, after);
+		return (false);
+	}
+	if ((st_lst_tag(redirs) == TAG_REDIR_IN
+			&& !st_open_replace(fd_in, filename, O_RDONLY))
+		|| (st_lst_tag(redirs) == TAG_REDIR_OUT
+			&& !st_open_replace(fd_out, filename, O_WRONLY | O_CREAT | O_TRUNC))
+		|| (st_lst_tag(redirs) == TAG_REDIR_APPEND
+			&& !st_open_replace(fd_out, filename, O_WRONLY | O_CREAT | O_APPEND)))
+	{
+		token_destroy_lst2(redirs, after);
+		return (false);
+	}
+	token_destroy_lst(redirs);
+	free(filename);
+	return (redir_extract(after, env, fd_in, fd_out));
+}