c言語ファイル検索、遍歴

linuxの下でopendir(),readdir(),lstat(),S_ISDIR(), closedir(),
Windows下用_findfirst(), _findnext(), _findclose(), _chdir(), _getcwd()とマクロ_A_SUBDIR
次はwindowsの下であるディレクトリの下で実現し、2級遍歴を行うプログラムです.

#include "stdafx.h"
#include <direct.h>
#include <stdio.h>
#include <io.h> //use _findfirst() and findnext() function
#include<string.h>
#include <windows.h>

int _tmain(int argc, _TCHAR* argv[])
{
	// change to the directory where you will look for files.
	char* dirname = "e:\\abc\\";
	_chdir(dirname);

	if(_access(dirname, 6) != 0)
	{
		printf("directory %s does not exist
", dirname);
		return 0;
	}

	char subdir[50];
	long handle;
	long subhandle;
	char* filetype = NULL;
	struct _finddata_t file;
	char subname[50];

	// printf("%d
", sizeof(needdirnames)/sizeof(char*));

	if((handle = _findfirst("*", &file)) == -1)
	{
		printf("some error happens
");
	}
	else
	{
		do
		{
			if((file.attrib & _A_SUBDIR) && !(strcmp(file.name, ".") == 0) && !(strcmp(file.name, "..") == 0))
			{
				strcpy_s(subdir, dirname);
				strcat_s(subdir, file.name);
				strcpy_s(subname, file.name);

				_chdir(subdir);
				if(_access(subdir, 6) != 0)
				{
					printf("directory %s does not exist
", dirname);
					continue;
				}

				if((subhandle = _findfirst("*", &file)) == -1)
				{
					continue;
				}

				printf("%s
", subname);
				do
				{
					if(!(file.attrib & _A_SUBDIR))
					{
						printf("%s
",file.name);
					}
				}while(_findnext(subhandle,&file) == 0);

				_findclose(subhandle);

				_chdir(dirname);

			}
		}while(_findnext(handle,&file) == 0); 

		_findclose(handle);
	}

	system("pause");
	return 0;
}