Basic touch clone for windows

touch.c

// Copyright (c) 2020 Aleksander B. Birkeland (thebirk)
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this softwareand associated documentation files(the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and /or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions :
// 
// The above copyright noticeand this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

// I don't know is this is how we are supposed to enable all the W stuff
// But I couldn't find any reasonable info on it so /shrug
#define UNICODE
#define _UNICODE

#include <Windows.h>
#include <stdio.h>
#include <locale.h>
#include <stdbool.h>

// linking wsetargv.obj makes windows pass globbed arguments as argv
// build command: "cl /nologo touch.c /link wsetargv.obj"

bool touch(wchar_t* path)
{
	HANDLE file = CreateFile(
		path,
		FILE_WRITE_ATTRIBUTES,
		0,
		0,
		OPEN_ALWAYS,
		0,
		0
	);

	if (file == INVALID_HANDLE_VALUE) {
		DWORD dLastError = GetLastError();
		LPCTSTR strErrorMessage = NULL;

		FormatMessage(
			FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ARGUMENT_ARRAY | FORMAT_MESSAGE_ALLOCATE_BUFFER,
			NULL,
			dLastError,
			0,
			(LPWSTR)& strErrorMessage,
			0,
			NULL);
		wprintf(L"failed to open '%ls': %ls\n", path, strErrorMessage);
		return false;
	}

	FILETIME now;
	GetSystemTimeAsFileTime(&now);
	SetFileTime(file, 0, &now, &now);
	CloseHandle(file);

	return true;
}

int wmain(int argc, wchar_t **argv)
{
	setlocale(LC_ALL, "");

	for (int i = 1; i < argc; i++) {
		if (touch(argv[i])) {
			wprintf(L"touched %ls\n", argv[i]);
		}
	}

	return 0;
}