builtin_unset.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   builtin_unset.c                                    :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: baelgadi <baelgadi@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/12/12 08:25:52 by baelgadi          #+#    #+#             */
/*   Updated: 2026/03/04 04:41:16 by baelgadi         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "builtins.h"
#include "libft.h"
 
static int  is_valid_unset_identifier(char *str)
{
    int i;
 
    if (!str || !str[0])
        return (0);
    if (!ft_isalpha(str[0]) && str[0] != '_')
        return (0);
    i = 1;
    while (str[i])
    {
        if (!ft_isalnum(str[i]) && str[i] != '_')
            return (0);
        i++;
    }
    return (1);
}
 
static void remove_env_node(t_env **env, char *key)
{
    t_env   *current;
 
    current = *env;
    while (current)
    {
        if (ft_strncmp(current->key, key, -1) == 0)
        {
            if (current->prev)
                current->prev->next = current->next;
            else
                *env = current->next;
            if (current->next)
                current->next->prev = current->prev;
            free(current->key);
            if (current->value)
                free(current->value);
            free(current);
            return ;
        }
        current = current->next;
    }
}
 
int builtin_unset(char **args, t_env **env)
{
    int i;
 
    i = 1;
    while (args[i])
    {
        if (args[i][0] == '-' && args[i][1])
        {
            ft_putstr_fd("minishell: unset: -", STDERR_FILENO);
            ft_putchar_fd(args[i][1], STDERR_FILENO);
            ft_putstr_fd(": invalid option\n", STDERR_FILENO);
            return (2);
        }
        if (is_valid_unset_identifier(args[i]))
            remove_env_node(env, args[i]);
        i++;
    }
    return (0);
}