dlls/userenv: fixed stubs GetUserProfileDirectoryW/A (7)

[Andreas Rosenberg]

Vitaliy Margolen wrote:

>> +    res = RegOpenKeyExW( HKEY_LOCAL_MACHINE, profile_pathname, 0L,
>> KEY_QUERY_VALUE, &keyProfileDir );
>> +        res = RegGetValueW( keyProfileDir, profile_subkey,
>> profile_keyname, RRF_RT_ANY,
>> +                           NULL, buffer, &sizePath );  /* RegGetValue
>> expects pcbData in bytes */
> 
> You opening the wrong key and querying the wrong value. You should be
> opening "Software\\Microsoft\\Windows NT\\CurrentVersion\\ProfileList" key
> and getting the value of "ProfilesDirectory" entry.

Don't see, why this should be wrong. RegKeyGetValue allows to specify a
subkey, for a previously opened key and query a value there. My current
implementation returned the correct path (imho). 
But I can change this.

> Now about those fixed size buffers in GetUserProfileDirectoryW(). Why
> can't you use the passed in buffer instead?

I changed it already. Maybe I was overcautious already modifying argument
buffers, if subsequent calls may still fail.

> 
> And the last thing - token. Look at _GetUserSidStringFromToken() from
> shell32/shellpath.c how to get the user from the token.
> 

I looked at it. But I did not get a final clue what are going to tell me by
referring to this.
- should I replace GetUserName() by a user information retrieved from
  the token?
- should I check user access rights to the registry key vs. the access
privileges from the token?