nativelibc/stdio/rename.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>

int rename(const char *oldfile, const char *newfile) {
	if(!oldfile || !newfile) {
		errno = EFAULT;
		return -1;
	}
	if(!*oldfile || !*newfile) {
		errno = ENOENT;
		return -1;
	}

	void *handle;
	IO_STATUS_BLOCK io_status;
	unsigned long int file_share = FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE;
	unsigned long int options = FILE_OPEN_REPARSE_POINT | FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_FOR_BACKUP_INTENT;
	UNICODE_STRING old_path;
	RtlCreateUnicodeStringFromAsciiz(&old_path, oldfile);
	PATHNAME_UNIX2NT_UTF16_STRUCT(old_path);
	OBJECT_ATTRIBUTES old_object = { sizeof(OBJECT_ATTRIBUTES), NULL, &old_path, 0, NULL, NULL };
	long int status = NtOpenFile(&handle, FILE_READ_ATTRIBUTES | DELETE | SYNCHRONIZE, &old_object, &io_status, file_share, options);
	options &= ~FILE_OPEN_REPARSE_POINT;
	if(status < 0) {
		if(status == STATUS_INVALID_PARAMETER) {
			status = NtOpenFile(&handle, DELETE | SYNCHRONIZE, &old_object, &io_status, file_share, options);
			RtlFreeUnicodeString(&old_path);
			if(status < 0) goto failed;
		} else {
			RtlFreeUnicodeString(&old_path);
failed:
			__set_errno_from_ntstatus(status);
			return -1;
		}
	} else {
		FILE_ATTRIBUTE_TAG_INFORMATION tag;
		status = NtQueryInformationFile(handle, &io_status, &tag, sizeof tag, FileAttributeTagInformation);
		if(status < 0) {
			RtlFreeUnicodeString(&old_path);
			if(status != STATUS_NOT_IMPLEMENTED && status != STATUS_INVALID_PARAMETER) goto failed;
		} else if((tag.FileAttributes & FILE_ATTRIBUTE_REPARSE_POINT) && tag.ReparseTag != IO_REPARSE_TAG_MOUNT_POINT) {
			NtClose(handle);
			status = NtOpenFile(&handle, DELETE | SYNCHRONIZE, &old_object, &io_status, file_share, options);
			RtlFreeUnicodeString(&old_path);
			if(__set_errno_from_ntstatus(status)) return -1;
		}
	}
	UNICODE_STRING new_path;
	RtlCreateUnicodeStringFromAsciiz(&new_path, newfile);
	PATHNAME_UNIX2NT_UTF16_STRUCT(new_path);

	OBJECT_ATTRIBUTES new_object = { sizeof(OBJECT_ATTRIBUTES), NULL, &new_path, 0, NULL, NULL };
	void *new_fh;
	status = NtOpenFile(&new_fh, FILE_READ_ATTRIBUTES | DELETE | SYNCHRONIZE, &new_object, &io_status, file_share, FILE_OPEN_REPARSE_POINT | options);
	if(status >= 0) {
		FILE_INTERNAL_INFORMATION fii1, fii2;
		if(NtQueryInformationFile(handle, &io_status, &fii1, sizeof fii1, FileInternalInformation) >= 0 &&
		NtQueryInformationFile(new_fh, &io_status, &fii2, sizeof fii2, FileInternalInformation) >= 0 &&
		fii1.IndexNumber.QuadPart == fii2.IndexNumber.QuadPart) {
			RtlFreeUnicodeString(&new_path);
			NtClose(handle);
			NtClose(new_fh);
			return 0;
		}
		NtClose(new_fh);
	}

	FILE_RENAME_INFORMATION *new_file_name = malloc(sizeof(FILE_RENAME_INFORMATION) + new_path.MaximumLength);
	if(!new_file_name) {
		NtClose(handle);
		RtlFreeUnicodeString(&new_path);
		errno = ENOMEM;
		return -1;
	}
	memcpy(new_file_name->FileName, new_path.Buffer, new_path.MaximumLength);
	new_file_name->ReplaceIfExists = 1;
	new_file_name->RootDirectory = NULL;
	new_file_name->FileNameLength = new_path.Length;
	status = NtSetInformationFile(handle, &io_status, new_file_name, sizeof(FILE_RENAME_INFORMATION) + new_path.MaximumLength, FileRenameInformation);
	free(new_file_name);
	RtlFreeUnicodeString(&new_path);
	NtClose(handle);
	return __set_errno_from_ntstatus(status) ? -1 : 0;
}