env_init.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   env_init.c                                         :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: baelgadi <baelgadi@student.42.fr>          +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2025/12/02 22:35:48 by zotaj-di          #+#    #+#             */
/*   Updated: 2026/03/04 04:41:49 by baelgadi         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "env.h"
#include "libft.h"
 
t_env   *init_env(char **envp)
{
    t_env   *head;
    t_env   *new_node;
    int     i;
 
    head = NULL;
    if (!envp || !envp[0])
        return (NULL);
    i = 0;
    while (envp[i])
    {
        new_node = create_env_node(envp[i]);
        if (!new_node)
        {
            free_env_list(&head);
            return (NULL);
        }
        add_env_node(&head, new_node);
        i++;
    }
    handle_shlvl(&head);
    ensure_pwd(&head);
    return (head);
}
 
static int  set_env_key_value(t_env *node, char *env_string, char *equal_pos)
{
    int key_len;
 
    key_len = equal_pos - env_string;
    node->key = ft_substr(env_string, 0, key_len);
    if (!node->key)
        return (0);
    node->value = ft_strdup(equal_pos + 1);
    if (!node->value)
    {
        free(node->key);
        return (0);
    }
    return (1);
}
 
t_env   *create_env_node(char *env_string)
{
    t_env   *node;
    char    *equal_pos;
 
    node = ft_calloc(sizeof(t_env), 1);
    if (!node)
        return (NULL);
    equal_pos = ft_strchr(env_string, '=');
    if (!equal_pos)
    {
        free(node);
        return (NULL);
    }
    if (!set_env_key_value(node, env_string, equal_pos))
    {
        free(node);
        return (NULL);
    }
    node->next = NULL;
    node->prev = NULL;
    return (node);
}
 
void    add_env_node(t_env **head, t_env *new_node)
{
    t_env   *current;
 
    if (!new_node)
        return ;
    if (!*head)
    {
        *head = new_node;
        return ;
    }
    current = *head;
    while (current->next)
        current = current->next;
    current->next = new_node;
    new_node->prev = current;
}