simple_cmd_execute: handle redirections

I am very uncertain on if this is actually correct, but I am unable to test it
very much atm

src/executing/simple_cmd/simple_cmd_execute.c

@@ -6,7 +6,7 @@
 /*   By: khais <marvin@42.fr>                       +#+  +:+       +#+        */
 /*                                                +#+#+#+#+#+   +#+           */
 /*   Created: 2025/03/27 16:21:56 by khais             #+#    #+#             */
-/*   Updated: 2025/04/04 17:09:39 by khais            ###   ########.fr       */
+/*   Updated: 2025/04/04 19:56:34 by khais            ###   ########.fr       */
 /*                                                                            */
 /* ************************************************************************** */
 
@@ -16,6 +16,7 @@
 #include "libft.h"
 #include "../../subst/subst.h"
 #include "../common/do_waitpid.h"
+#include "../../minishell.h"
 #include <unistd.h>
 #include <sys/wait.h>
 #include <stdio.h>
@@ -27,6 +28,40 @@ static void	command_not_found(t_simple_cmd *cmd)
 		cmd->words->word->word);
 }
 
+static t_redirect	*do_redirection(t_redirect *redirection)
+{
+	int	fd;
+
+	if (redirection->type == FT_HEREDOC)
+		fd = redirection->redirectee.dest;
+	else
+	{
+		fd = open(redirection->redirectee.filename->word,
+				redirection->open_flags, redirection->c_flags);
+		if (fd < 0)
+			return (perror("minishell: open"), NULL);
+	}
+	if (dup2(fd, redirection->source) < 0)
+		return (perror("minishell: dup2"), NULL);
+	close(fd);
+	return (redirection);
+}
+
+static t_simple_cmd	*handle_redirections(t_simple_cmd *cmd, t_minishell *app)
+{
+	t_redirect	*redirections;
+
+	(void)app;
+	redirections = cmd->redirections;
+	while (redirections != NULL)
+	{
+		if (do_redirection(redirections) == NULL)
+			return (NULL);
+		redirections = redirections->next;
+	}
+	return (cmd);
+}
+
 void	simple_cmd_execute(t_simple_cmd *cmd, t_minishell *app)
 {
 	char	*exe;
@@ -34,6 +69,8 @@ void	simple_cmd_execute(t_simple_cmd *cmd, t_minishell *app)
 
 	if (cmd == NULL || cmd->words == NULL || cmd->words->word == NULL)
 		return ;
+	if (handle_redirections(cmd, app) == NULL)
+		return ;
 	if (execute_builtin(cmd, app) != BUILTIN_INVALID)
 		return ;
 	exe = get_cmdpath(cmd->words->word->word, app);