Re: [ros-dev] [ros-diffs] [hbelusca] 71695: [SUBST] - Update the resource program description. - Convert to full UNICODE. - Use Win32 functions where possible. - Factor-out the usage of QueryDosDevice into a QuerySubstedDri...

[Thomas Faber]

On 2016-06-29 02:38, hbelusca(a)svn.reactos.org wrote:
>   +    if (!CharCount && (Result ==
> ERROR_INSUFFICIENT_BUFFER))
>  +    {
>  +        /* Reallocate the buffer with double size */
>  +        dwSize *= 2;
>  +        tmp = (PWSTR)HeapReAlloc(GetProcessHeap(), 0, lpTargetPath, dwSize *
> sizeof(WCHAR)); 
Oops, this fixes my previous concern, thanks.
The casts are still weird though.
>   +        if (!tmp)
>  +        {
>  +            /* Memory problem, bail out */
>  +            CharCount = 0;
>  +            Result = ERROR_NOT_ENOUGH_MEMORY;
>  +        }
>  +        else
>  +        {
>  +            /* Retry again */
>  +            lpTargetPath = tmp;
>  +            goto Retry;
>  +        }
>  +    }
>  +
>  +    if (CharCount)
>  +    {
>  +        if ( wcsncmp(lpTargetPath, L"\\??\\", 4) == 0 &&
>  +             ( (lpTargetPath[4] >= L'A' && lpTargetPath[4] <=
> L'Z') ||
>  +               (lpTargetPath[4] >= L'a' && lpTargetPath[4] <=
> L'z') ) )
>  +        {
>  +            /* The drive exists and is SUBSTed */
>  +            Result = ERROR_IS_SUBSTED;
>  +        }
>  +#if 0
>  +        else
>  +        {
>  +            /* The drive exists but is not SUBSTed */
>  +            Result = ERROR_INVALID_DRIVE;
>  +        }
>  +#endif
>  +    }
>  +
>  +    if (!TargetPath)
>  +    {
>  +        /* Free the local buffer */
>  +        HeapFree(GetProcessHeap(), 0, lpTargetPath);
>  +    }
>  +    else
>  +    {
>  +        /* Update the user-given pointers */
>  +        *TargetPath = lpTargetPath;
>  +        *Size = dwSize; 
If the HeapReAlloc above fails you might still get into this code path
which is not advisable. It should probably always take the if-branch in
that case.
>   +    }
>  +
>  +    return Result; 
Thanks.
-Thomas