From d2a8f6c36047428a0cc5eafdada9ec9d6b1e912b Mon Sep 17 00:00:00 2001
From: Dominik Kaiser <dkaiser@3-F-2.42heilbronn.de>
Date: Thu, 2 May 2024 15:37:25 +0200
Subject: [PATCH] Add input handling for commands

---
 src/input_handling.c | 117 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 src/input_handling.c

diff --git a/src/input_handling.c b/src/input_handling.c
new file mode 100644
index 0000000..f6fa7f8
--- /dev/null
+++ b/src/input_handling.c
@@ -0,0 +1,117 @@
+/* ************************************************************************** */
+/*                                                                            */
+/*                                                        :::      ::::::::   */
+/*   input_handling.c                                   :+:      :+:    :+:   */
+/*                                                    +:+ +:+         +:+     */
+/*   By: dkaiser <dkaiser@student.42heilbronn.de    +#+  +:+       +#+        */
+/*                                                +#+#+#+#+#+   +#+           */
+/*   Created: 2024/05/02 12:13:23 by dkaiser           #+#    #+#             */
+/*   Updated: 2024/05/02 15:36:43 by dkaiser          ###   ########.fr       */
+/*                                                                            */
+/* ************************************************************************** */
+
+#include "libft.h"
+#include "pipex.h"
+#include <fcntl.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static char	**get_split_path(char *envp[])
+{
+	char	*path;
+
+	while (!ft_strnstr(*envp, "PATH=", 5))
+		envp++;
+	if (!*envp)
+		return (NULL);
+	path = *envp + 5;
+	return (ft_split(path, ':'));
+}
+
+static char	*get_pwd(char *envp[])
+{
+	while (!ft_strnstr(*envp, "PWD=", 4))
+		envp++;
+	if (!*envp)
+		return (NULL);
+	return (*envp + 4);
+}
+
+static char	*find_in_path(char *cmd, char **path)
+{
+	char	*cur_path;
+	char	*cmd_path;
+
+	cmd_path = NULL;
+	while (*path)
+	{
+		if (cmd_path)
+			free(cmd_path);
+		cur_path = ft_strjoin(*path, "/");
+		// TODO: Free on fail
+		cmd_path = ft_strjoin(cur_path, cmd);
+		free(cur_path);
+		if (access(cmd_path, X_OK) != -1)
+			return (cur_path);
+		path++;
+	}
+	return (NULL);
+}
+
+static char	*get_cmd_path(char *cmd, char **path, char *pwd)
+{
+	char	*cur_dir;
+
+	if (cmd[0] == '/')
+		return (cmd); // TODO: Maybe use duplicate instead, so there will be no problem on free()
+	else if (strchr(cmd, '/'))
+	{
+		cur_dir = ft_strjoin(pwd, "/");
+		// TODO: Free on fail
+		// TODO: Maybe check if executable, else there might be a problem...
+		return (ft_strjoin(cur_dir, cmd));
+	}
+	else
+    {
+        return (find_in_path(cmd, path));
+    }
+}
+
+static char	**get_cmds(int argc, char *argv[], char *envp[])
+{
+	char	**cmds;
+	int		i;
+	char	**path;
+	char	*pwd;
+
+	cmds = malloc(sizeof(char *) * (argc - 2));
+	if (!cmds)
+		return (NULL);
+	path = get_split_path(envp);
+	// TODO: Free on fail
+	pwd = get_pwd(envp);
+	i = 2;
+	while (i < argc - 1)
+	{
+		cmds[i - 2] = get_cmd_path(argv[i], path, pwd);
+		i++;
+	}
+	i = 0;
+	while (path[i])
+		free(path[i++]);
+	free(path);
+	return (cmds);
+}
+
+t_pxdata	*get_pxdata(int argc, char *argv[], char *envp[])
+{
+	t_pxdata	*result;
+
+	result = malloc(sizeof(t_pxdata));
+	if (!result)
+		return (NULL); // TODO: Check if an error message needs to be sent
+	result->in_fd = open(argv[1], O_RDONLY);
+	result->out_fd = open(argv[--argc], O_WRONLY | O_CREAT | O_TRUNC);
+	result->cmds = get_cmds(argc, argv, envp);
+	return (result);
+}
-- 
2.47.2