/****************************************************************************
 * Private *at functions                                                    *
 ****************************************************************************/

/**
 * @file private_at_functions.h
 * @author Celine Mercier
 * @date 15 June 2015
 * @brief Private replacement functions for *at functions.
 */


#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>

#include "private_at_functions.h"


/**********************************************************************
 *
 * D E F I N I T I O N   O F   T H E   P U B L I C   F U N C T I O N S
 *
 **********************************************************************/


char* get_full_path(int directory_file_descriptor, const char* path_name)
{
	char* full_path;

	full_path = (char*) malloc((MAX_PATH_LEN)*sizeof(char));
	if (full_path == NULL)
		return NULL;

	if (fcntl(directory_file_descriptor, F_GETPATH, full_path) < 0)
		return NULL;

	// check errors  TODO
	strlcat(full_path, "/", MAX_PATH_LEN);
	strlcat(full_path, path_name, MAX_PATH_LEN);

	return full_path;
}


int private_openat(int directory_file_descriptor, const char* path_name, int flags)
{
	char* full_path;
	int file_descriptor;

	full_path = get_full_path(directory_file_descriptor, path_name);
	if (full_path == NULL)
		return -1;

	file_descriptor = open(full_path, flags);

	free(full_path);

	return file_descriptor;
}


int private_mkdirat(int directory_file_descriptor, const char* path_name, mode_t mode)
{
	char* full_path;

	full_path = get_full_path(directory_file_descriptor, path_name);
	if (full_path == NULL)
		return -1;

	if (mkdir(full_path, mode) < 0)
	{
		free(full_path);
		return -1;
	}

	free(full_path);

	return 0;
}


DIR* private_opendirat(int directory_file_descriptor, const char* path_name)
{
	char* full_path;
	DIR* directory;

	full_path = get_full_path(directory_file_descriptor, path_name);
	if (full_path == NULL)
		return NULL;

	directory = opendir(full_path);

	free(full_path);

	return directory;
}