Add input handling for commands

diff --git a/src/input_handling.c b/src/input_handling.c
new file mode 100644 (file)
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);
+}