nativelibc/rmdir.c

/*	A part of the Native C Library for Windows NT
	Copyright 2007-2015 PC GO Ld.

	This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
*/

#include <windows.h>
#include <nt.h>
#include <errno.h>
#include <pathname.h>
#include <ntstatus.h>

#include <stdio.h>

int rmdir(const char *pathname) {
	if(!pathname) {
		errno = EFAULT;
		return -1;
	}
	if(!*pathname) {
		errno = ENOENT;
		return -1;
	}

	if(*pathname != '/') {
		errno = ENOSYS;
		return -1;
	}

	if(!pathname[1]) {
		// Want to remove / ??
		errno = EPERM;
		return -1;
	}

	UNICODE_STRING ntpathname;
	RtlCreateUnicodeStringFromAsciiz(&ntpathname, pathname);
	if(ntpathname.Length > sizeof(wchar_t) && ntpathname.Buffer[ntpathname.Length / sizeof(wchar_t) - 1] == L'/') {
		ntpathname.Buffer[ntpathname.Length / sizeof(wchar_t) - 1] = 0;
		ntpathname.Length -= sizeof(wchar_t);
		ntpathname.MaximumLength -= sizeof(wchar_t);
	}
	PATHNAME_UNIX2NT_UTF16_STRUCT(ntpathname);
	void *handle;
	OBJECT_ATTRIBUTES object_attrib = { sizeof(OBJECT_ATTRIBUTES), NULL, &ntpathname, 0, NULL, NULL };

	long int status = NtOpenSymbolicLinkObject(&handle, 0, &object_attrib);
	printf("nativelibc debug: rmdir: check sym link: status = 0x%lx\n", status);
	if(status != STATUS_OBJECT_TYPE_MISMATCH) {
		// The rmdir will failed on symbolic link even the pathname contents a '/' at end
		RtlFreeUnicodeString(&ntpathname);
		if(status >= 0) NtClose(handle);
		errno = ENOTDIR;
		return -1;
	}

	status = NtOpenDirectoryObject(&handle, DELETE, &object_attrib);
	printf("nativelibc debug: rmdir check dir object: status = 0x%lx\n", status);
	if(status != STATUS_OBJECT_TYPE_MISMATCH) {
		RtlFreeUnicodeString(&ntpathname);
		if(status < 0) {
			__set_errno_from_ntstatus(status);
			return -1;
		}

		// TODO: Check whatever the directory is empty

		status = NtMakeTemporaryObject(handle);
		printf("nativelibc debug: rmdir: status = 0x%lx\n", status);
		NtClose(handle);
		return __set_errno_from_ntstatus(status) ? -1 : 0;
	}

	IO_STATUS_BLOCK io_status;
	unsigned long int file_share = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
	unsigned long int options = FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_FOR_BACKUP_INTENT;
	status = NtOpenFile(&handle, FILE_LIST_DIRECTORY | DELETE | SYNCHRONIZE, &object_attrib, &io_status, file_share, options);
	printf("nativelibc debug: rmdir: status = 0x%lx\n", status);
	if(status < 0) {
		RtlFreeUnicodeString(&ntpathname);
		__set_errno_from_ntstatus(status);
		return -1;
	}
	// TODO: Remove a EMPTY directory on a file system
	RtlFreeUnicodeString(&ntpathname);
	NtClose(handle);
	return -1;
}