builtins

srcs/builtins/cd.c

@@ -1,6 +1,65 @@
 #include "../../includes/builtins.h"
 
-void	builtin_cd(char *str)
+char	**update_oldpwd(char **envp)
 {
-	(void)str;	
+	char	**new_envp;
+	int		i;
+
+	i = 0;
+	while (envp[i])
+		i++;
+	new_envp = malloc(sizeof(char *) * i + 1);
+	if (!new_envp)
+		return (perror("malloc"), NULL);
+	new_envp[i] = NULL;
+	i = -1;
+	while (envp[++i])
+	{
+		if (ft_strnstr(envp[i], "OLDPWD=", 7) == NULL)
+			new_envp[i] = ft_strdup(envp[i]);
+		else
+			new_envp[i] = ft_strjoin("OLDPWD=", getcwd(NULL, 0));
+	}
+	return (new_envp);
+}
+
+char	**update_pwd(char **envp)
+{
+	char	**new_envp;
+	int		i;
+
+	i = 0;
+	while (envp[i])
+		i++;
+	new_envp = malloc(sizeof(char *) * i + 1);
+	if (!new_envp)
+		return (perror("malloc"), NULL);
+	new_envp[i] = NULL;
+	i = -1;
+	while (envp[++i])
+	{
+		if (ft_strnstr(envp[i], "PWD=", 4) == NULL)
+			new_envp[i] = ft_strdup(envp[i]);
+		else
+			new_envp[i] = ft_strjoin("PWD=", getcwd(NULL, 0));
+	}
+	return (new_envp);
+}
+
+char	**builtin_cd(char **arg, char **envp)
+{
+	/*
+	 * OLDPWD = getcwd()
+	 */
+	envp = update_oldpwd(envp);
+	if (chdir(arg[1]) == -1)
+	{
+		perror("cd");
+		return (envp);
+	}
+	envp = update_pwd(envp);
+	/*
+	 * PWD = getcwd()
+	 */
+	return (envp);
 }