On 2016-06-29 02:38, [email protected] 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
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