For tcp/udp file descriptors, they can return 0 length sometimes and we want to
then return `f` so we read to EOF.
> On Jul 7, 2016, at 2:26 PM, Alexander Ilin <ajs...@yandex.ru> wrote:
>
> Hello!
>
> OK, ignore that last message, I can see now that it works.
>
> Another question, though. This one is about io.ports:
>
> M: buffered-port stream-length
> handle>> handle-length [ f ] when-zero ;
>
> Why does it never return 0? For instance, what if I open an empty file for
> reading, I'd expect it to return 0, and "f" only for streams that are not
> seekable.
>
> { 0 }
> [
> "empty.txt" binary [ input-stream get stream-length ] with-file-reader
> ] unit-test
>
> From the documentation on stream-length:
> Word description
> Returns the length of the data supplied by stream, or f if the stream is not
> seekable or has unknown length.
>
> Why not return 0 so that I could test that with if-zero?
>
> 07.07.2016, 23:55, "Alexander Ilin" <ajs...@yandex.ru>:
>> Hello!
>>
>> I'm deep in debugging, so just a quick note/question: does the following
>> word work?
>>
>> M: windows can-seek-handle? ( handle -- ? )
>> handle>> handle>file-size >boolean ;
>>
>> given that handle>file-size is implemented a few lines above as follows
>> (the comment is in the code as well):
>>
>> ! GetFileSizeEx errors with ERROR_INVALID_FUNCTION if handle is not seekable
>> : handle>file-size ( handle -- n/f )
>> (handle>file-size) [
>> GetLastError ERROR_INVALID_FUNCTION =
>> [ f ] [ throw-win32-error ] if
>> ] unless* ;
>>
>> ---=====---
>> Александр
>>
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> ---=====---
> Александр
>
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