is_network_path.c

#include <windows.h>
#include <stdio.h>
#include <stdbool.h>

static bool is_network_path(const wchar_t *path)
{
	wchar_t vol[32768];

	if (GetVolumePathNameW(path, vol, sizeof(vol) / sizeof(wchar_t)))
		return GetDriveTypeW(vol) == DRIVE_REMOTE;
	return false;
}

int wmain(int argc, wchar_t **argv)
{
	wprintf(L"is_network_path() = %ls\n",
		is_network_path(argv[1]) ? L"true" : L"false");
	return 0;
}