/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   u_path.c                                           :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: rbousset <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/02/14 17:19:27 by rbousset          #+#    #+#             */
/*   Updated: 2020/02/14 17:19:29 by rbousset         ###   ########lyon.fr   */
/*                                                                            */
/* ************************************************************************** */

#include <libft.h>
#include <stddef.h>
#include <dirent.h>
#ifdef __linux__
# include <linux/limits.h>
#else
# include <limits.h>
#endif

#include "s_struct.h"
#include "u_path.h"
#include "u_vars.h"

static void		u_get_fullpath(char fullpath[],
							const char p_path[],
							const char d_name[],
							size_t dstsize)
{
	const size_t	path_len = ft_strlen(p_path);
	const size_t	name_len = ft_strlen(d_name);

	fullpath[0] = C_NUL;
	if (path_len + name_len < dstsize)
	{
		(void)ft_memcpy(fullpath, p_path, path_len * sizeof(char));
		*(fullpath + (path_len)) = '/';
		(void)ft_memcpy(fullpath + path_len + 1, d_name,
			name_len * sizeof(char));
		*(fullpath + (path_len + name_len + 1)) = '\0';
	}
}

static int8_t	u_read_dir(DIR *dir,
						struct s_path s,
						const char com[],
						char fullpath[])
{
	struct dirent	*ent;

	while ((ent = readdir(dir)) != NULL)
	{
		if (ft_strncmp(com, ent->d_name, ft_strlen(com) + 1) == 0)
		{
			u_get_fullpath(fullpath, s.tok_path, ent->d_name, s.dstsize);
			closedir(dir);
			if (fullpath[0] == C_NUL)
				return (1);
			return (0);
		}
	}
	return (-1);
}

uint8_t			u_search_in_path(char fullpath[],
								const char com[],
								size_t dstsize,
								t_msh *msh)
{
	char			tmp[ARG_MAX];
	struct s_path	s;
	DIR				*dir;
	int8_t			ret;

	if (u_get_var_value(tmp, "$PATH", ARG_MAX, msh) != 0)
		return (2);
	s.dstsize = dstsize;
	s.tok_path = ft_strtok(tmp, ":");
	while (s.tok_path != NULL)
	{
		if ((dir = opendir(s.tok_path)) != NULL)
		{
			ret = u_read_dir(dir, s, com, fullpath);
			if (ret == 0 || ret == 1)
				return (ret);
			closedir(dir);
		}
		s.tok_path = ft_strtok(NULL, ":");
	}
	return (2);
}