42_minishell/env.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   env.c                                              :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: erey-bet <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2023/02/02 14:39:56 by erey-bet          #+#    #+#             */
/*   Updated: 2023/02/03 16:04:16 by erey-bet         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "minishell.h"

int	get_index(char *s, char c)
{
	int	i;

	i = -1;
	while (s[++i])
		if (s[i] == c)
			return (i);
	return (-1);
}

void	print_export(t_list **head, int fd)
{
	t_list	*current;
	char	*ctn;
	int		v;

	current = *head;
	while (current != NULL)
	{
		ctn = current->content;
		if (*(ft_strchr(ctn, '=') - 1) != '_')
		{
			v = get_index(ctn, '=');
			write(fd, "declare -x ", 11);
			write(fd, ctn, v + 1);
			write(fd, "\"", 1);
			ft_putstr_fd(ctn + v + 1, fd);
			write(fd, "\"\n", 2);
		}
		current = current->next;
	}
}

void	print_env(t_list **head, int fd)
{
	t_list	*current;

	current = *head;
	while (current != NULL)
	{
		ft_putstr_fd(current->content, fd);
		write(fd, "\n", 1);
		current = current->next;
	}
}

int	strcmp_alphabet(char *s1, char *s2)
{
	int	i;

	if (!s1 || !s2)
		return (-2);
	i = 0;
	while (s1[i] && s2[i])
	{
		if (s1[i] < s2[i])
			return (0);
		else if (s1[i] > s2[i])
			return (1);
		i++;
	}
	return (-1);
}

void	ft_double_swap(char **a, char **b)
{
	void	*c;

	c = *a;
	*a = *b;
	*b = c;
}

void	exchange(char **a, char **b, char **c)
{
	void	*d;

	d = *a;
	*a = *b;
	*b = *c;
	*c = d;
}

void	add_sort(t_list **head, char *str)
{
	t_list	*current;
	char	*last;

	current = *head;
	while (current->next != NULL && strcmp_alphabet(str, current->content) != 0)
		current = current->next;
	if (strcmp_alphabet(str, current->content) == 1)
		last = str;
	else
		exchange(&last, (char **)(&current->content), &str);
	while (current != NULL)
	{
		if (current->next == NULL)
			current->next = ft_calloc(1, sizeof(t_list));
		if (current->next == NULL)
			return ;
		current = current->next;
		if (current->content == NULL)
		{
			current->content = last;
			return ;
		}
		else
			ft_double_swap((char **)(&current->content), &last);
	}
}

char	*get_value_index(int index, t_list **head)
{
	t_list	*current;
	int		i;

	current = *head;
	i = -1;
	while (current != NULL && ++i != index)
		current = current->next;
	if (i == index)
		return (ft_strchr(current->content, '=') + 1);
	return (NULL);
}

int	is_start(char *big, char *little)
{
	int	i;

	i = 0;
	while (big[i])
	{
		if (little[i] != big[i])
			return (0);
		i++;
		if (!little[i])
			return (1);
	}
	return (0);
}

char	*get_value_key(char *key, t_list **head)
{
	t_list	*current;

	current = *head;
	while (current != NULL)
	{
		if (is_start(current->content, key))
			return (ft_strchr(current->content, '=') + 1);
		current = current->next;
	}
	return (NULL);
}

int	set_value_key(char *key, t_list **head, char *str)
{
	t_list	*current;
	char	*temp;
	size_t	len;

	current = *head;
	while (current != NULL)
	{
		if (is_start(current->content, key))
		{
			len = ft_strlen(current->content);
			temp = current->content;
			current->content = ft_strreplace(temp, str, ft_strnchr(temp, '=') + 1, len - get_index(temp, '=') - 1);
			free(temp);
			if (current->content == NULL)
				return (1);
			break ;
		}
		current = current->next;
	}
	return (0);
}

t_list	**init_env(char **env)
{
	t_list	**head;
	int		i;

	head = ft_calloc(1, sizeof(t_list *));
	*head = ft_calloc(1, sizeof(t_list));
	if (*head == NULL)
		return (NULL);
	i = -1;
	while (env[++i])
		add_sort(head, env[i]);
	return (head);
}

int	main(int argc, char *argv[], char **env)
{
	t_list	**i_env;

	(void)argc;
	(void)argv;
	i_env = init_env(env);
	ft_putstr_fd(get_value_key("PATH", i_env), 1);
	ft_putstr_fd("/n", 1);
	set_value_key("PATH", i_env, "BITE");
	ft_putstr_fd(get_value_key("PATH", i_env), 1);
	return (0);
}