Implement cd and cd -

_getenv.c

@@ -0,0 +1,40 @@
+#include "shell.h"
+
+/**
+ * _getenv - gets the value of an environment variable
+ * @shell: shell data
+ * @name: name of variable
+ *
+ * Return: pointer to the value
+ */
+
+char *_getenv(sh_data *shell, char *name)
+{
+	int i, j, k, l, check;
+	char *value;
+
+	for (i = 0; shell->_environ[i]; i++)
+	{
+		j = 0, check = 0;
+		while (shell->_environ[i][j] != '=' && name[j] != '\0')
+		{
+			if (shell->_environ[i][j] != name[j])
+				check = 1;
+			j++;
+		}
+		if (check == 0)
+		{
+			for (k = j + 1, l = 0; shell->_environ[i][k]; k++, l++)
+				;
+
+			value = malloc(sizeof(char) * (l + 1));
+
+			for (k = j + 1, l = 0; shell->_environ[i][k]; l++, k++)
+				value[l] = shell->_environ[i][k];
+			value[l] = '\0';
+			return (value);
+		}
+	}
+
+	return (NULL);
+}

builtins.c

@@ -1,5 +1,64 @@
 #include "shell.h"
 
+/**
+ * my_cd - exits the shell
+ * @shell: shell data
+ *
+ * Return: an exit value
+ */
+int my_cd(sh_data *shell)
+{
+	int m, n = 0;
+	char *new_pwd;
+	char *old_pwd = _getenv(shell, "PWD");
+
+	if (shell->arr[1] == NULL)
+	{
+		free_arr2(shell->arr);
+		shell->arr = malloc(sizeof(char *) * 3);
+		shell->arr[0] = my_strdup("cd");
+		shell->arr[1] = _getenv(shell, "HOME");
+		shell->arr[2] = NULL;
+	}
+	else if (my_strcmp(shell->arr[1], "-") == 0)
+	{
+		free(shell->arr[1]);
+		shell->arr[1] = _getenv(shell, "OLDPWD");
+		n++;
+	}
+
+	m = chdir(shell->arr[1]);
+	if (m == -1)
+		printf("%s: %s: No such file or directory\n", shell->arr[0], shell->arr[1]);
+	if (n == 1)
+	{
+		write(STDOUT_FILENO, shell->arr[1], my_strlen(shell->arr[1]));
+		write(STDOUT_FILENO, "\n", 1);
+	}
+
+	new_pwd = getcwd(NULL, 1024);
+
+	free_arr2(shell->arr);
+	shell->arr = malloc(sizeof(char *) * 4);
+	shell->arr[0] = my_strdup("setenv");
+	shell->arr[1] = my_strdup("PWD");
+	shell->arr[2] = my_strdup(new_pwd);
+	shell->arr[3] = NULL;
+	my_set(shell);
+
+	free_arr2(shell->arr);
+	shell->arr = malloc(sizeof(char *) * 4);
+	shell->arr[0] = my_strdup("setenv");
+	shell->arr[1] = my_strdup("OLDPWD");
+	shell->arr[2] = my_strdup(old_pwd);
+	shell->arr[3] = NULL;
+	my_set(shell);
+
+	free(new_pwd);
+	free(old_pwd);
+	return (0);
+}
+
 /**
  * my_exit - exits the shell
  * @shell: shell data

get_commands.c

@@ -11,7 +11,6 @@ char **get_commands(char *buffer, size_t n)
 {
 	char **arr = NULL;
 	char *token;
-	/* char delim[6] = " \t\r\a\n"; */
 	size_t k = 0;
 	ssize_t i, r;
 

shell.c

@@ -13,9 +13,7 @@ int (*get_func(char **arr))(sh_data *)
 		{"env", my_env},
 		{"setenv", my_set},
 		{"unsetenv", my_unset},
-		/**
-		 * {"cd", my_cd}
-		 */
+		{"cd", my_cd},
 		{NULL, NULL}
 	};
 
@@ -62,7 +60,15 @@ void loop_shell(sh_data *shell)
 		{
 			shell->status = execve(path, shell->arr, shell->_environ);
 			if (shell->status == -1)
+			{
+				printf("%s: Permission denied\n", shell->arr[0]);
+				free_list(shell->path);
+				free_arr2(shell->_environ);
+				free_arr2(shell->arr);
+				free(shell->line);
+				free(path);
 				exit(98);
+			}
 		}
 		else
 		{

shell.h

@@ -66,7 +66,7 @@ typedef struct built_in
 } built_in;
 
 char **get_commands(char *, size_t);
-char *_getenv(const char *);
+char *_getenv(sh_data *, char *);
 char *mod_env(sh_data *);
 char *check_shell(sh_data *);
 char *my_strcat(char *, char *);
@@ -75,7 +75,8 @@ char *my_strdup(char *);
 char *my_strtok(char *, const char *);
 char *search_path(path_l *, char *);
 int (*get_func(char **))(sh_data *);
-int my_atoi(char *s);
+int my_atoi(char *);
+int my_cd(sh_data *);
 int my_env(sh_data *);
 int my_exit(sh_data *);
 int my_set(sh_data *);