builtin_cd.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   builtin_cd.c                                       :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: baelgadi <baelgadi@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/12/11 06:22:28 by baelgadi          #+#    #+#             */
/*   Updated: 2026/03/04 04:40:30 by baelgadi         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include <stdio.h>
#include "builtins.h"
#include "libft.h"
#include "env.h"
 
static char *get_home_path(t_env *env)
{
    char    *path;
 
    path = get_env_value(env, "HOME");
    if (!path)
        ft_putstr_fd("minishell: cd: HOME not set\n", STDERR_FILENO);
    return (path);
}
 
static char *get_cd_path(char **args, t_env *env, int *err)
{
    char    *path;
 
    *err = 0;
    if (!args[1] || ft_strncmp(args[1], "--", 3) == 0)
    {
        if (args[1] && args[2] && args[3])
            return (*err = 1, NULL);
        if (args[1] && args[2])
            return (args[2]);
        return (get_home_path(env));
    }
    if (args[2])
        return (*err = 1, NULL);
    if (ft_strncmp(args[1], "-", 2) == 0)
    {
        path = get_env_value(env, "OLDPWD");
        if (!path)
            ft_putstr_fd("minishell: cd: OLDPWD not set\n", STDERR_FILENO);
        else
            ft_putendl_fd(path, STDOUT_FILENO);
        return (path);
    }
    return (args[1]);
}
 
static void update_pwd_vars(t_env **env, char *old_pwd)
{
    char    cwd[PATH_MAX];
 
    if (old_pwd && old_pwd[0])
        set_env_value(env, "OLDPWD", old_pwd);
    if (getcwd(cwd, PATH_MAX))
        set_env_value(env, "PWD", cwd);
}
 
int builtin_cd(char **args, t_env **env)
{
    char    *path;
    char    old_pwd[PATH_MAX];
    int     too_many;
 
    if (!getcwd(old_pwd, PATH_MAX))
        old_pwd[0] = '\0';
    path = get_cd_path(args, *env, &too_many);
    if (too_many)
        return (ft_putstr_fd("minishell: cd: too many arguments\n", 2), 1);
    if (!path)
        return (1);
    if (chdir(path) == -1)
    {
        ft_putstr_fd("minishell: cd: ", STDERR_FILENO);
        perror(path);
        return (1);
    }
    update_pwd_vars(env, old_pwd);
    return (0);
}