env.c

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/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   env.c                                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: dmdemirk <dmdemirk@student.42london.c      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2024/06/07 17:20:11 by dmdemirk          #+#    #+#             */
/*   Updated: 2024/09/09 13:08:55 by dmdemirk         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */
 
#include "env.h"
#include "libft.h"
#include <stdlib.h>
#include <stdio.h>
 
void    init_env(t_env **data_envp, char **envp);
void    add_env_node(t_env **data_envp, char *line);
char    *get_env(t_env *envp, const char *key);
void    set_env(t_env **env, const char *key, const char *value);
int     unset_env(t_env **env, const char *name);
 
void    init_env(t_env **data_envp, char **envp)
{
    int i;
 
    i = -1;
    while (envp[++i])
        add_env_node(data_envp, envp[i]);
}
 
void    add_env_node(t_env **data_envp, char *line)
{
    t_env   *new_node;
    char    *eq_pos;
    t_env   *curr;
 
    new_node = malloc(sizeof(t_env));
    if (!new_node)
        return ;
    eq_pos = ft_strchr(line, '=');
    if (!eq_pos)
        return ;
    new_node->key = ft_strndup(line, eq_pos - line);
    new_node->value = ft_strdup(eq_pos + 1);
    new_node->next = NULL;
    if (!*data_envp)
        *data_envp = new_node;
    else
    {
        curr = *data_envp;
        while (curr->next)
            curr = curr->next;
        curr->next = new_node;
    }
}
 
char    *get_env(t_env *envp, const char *key)
{
    t_env   *curr_node;
 
    curr_node = envp;
    while (curr_node)
    {
        if (ft_strcmp(curr_node->key, key) == 0)
            return (curr_node->value);
        curr_node = curr_node->next;
    }
    return (NULL);
}
 
void    set_env(t_env **env, const char *key, const char *value)
{
    t_env   *current;
    t_env   *new_env;
 
    current = *env;
    while (current)
    {
        if (ft_strcmp(current->key, key) == 0)
        {
            free(current->value);
            current->value = ft_strdup(value);
            return ;
        }
        current = current->next;
    }
    new_env = malloc(sizeof(t_env));
    new_env->key = ft_strdup(key);
    new_env->value = ft_strdup(value);
    new_env->next = *env;
    *env = new_env;
}
 
int unset_env(t_env **env, const char *key)
{
    t_env   *current;
    t_env   *prev;
 
    current = *env;
    prev = NULL;
    while (current)
    {
        if (ft_strcmp(current->key, key) == 0)
        {
            if (prev)
                prev->next = current->next;
            else
                *env = current->next;
            free(current->key);
            free(current->value);
            free(current);
            return (0);
        }
        prev = current;
        current = current->next;
    }
    return (-1);
}