Hello, John!
TCP/UDP streams are not seekable, so it should return f, and it does. Why
does it not return 0 for seekable empty (file) streams?
A bigger quote from the documentation:
Word description
Returns the length of the data supplied by stream, or f if the stream is not
seekable or has unknown length.
Notes
Stream seeking is not supported on streams that do not have a known length,
e.g. TCP/IP streams.
08.07.2016, 00:42, "John Benediktsson" <mrj...@gmail.com>:
> 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
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
>>> Francisco, CA to explore cutting-edge tech and listen to tech luminaries
>>> present their vision of the future. This family event has something for
>>> everyone, including kids. Get more information and register today.
>>> http://sdm.link/attshape
>>> _______________________________________________
>>> Factor-talk mailing list
>>> Factor-talk@lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/factor-talk
>>
>> ---=====---
>> Александр
>>
>>
>> ------------------------------------------------------------------------------
>> Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
>> Francisco, CA to explore cutting-edge tech and listen to tech luminaries
>> present their vision of the future. This family event has something for
>> everyone, including kids. Get more information and register today.
>> http://sdm.link/attshape
>> _______________________________________________
>> Factor-talk mailing list
>> Factor-talk@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/factor-talk
>
> ------------------------------------------------------------------------------
> Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
> Francisco, CA to explore cutting-edge tech and listen to tech luminaries
> present their vision of the future. This family event has something for
> everyone, including kids. Get more information and register today.
> http://sdm.link/attshape
> _______________________________________________
> Factor-talk mailing list
> Factor-talk@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/factor-talk
---=====---
Александр
------------------------------------------------------------------------------
Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San
Francisco, CA to explore cutting-edge tech and listen to tech luminaries
present their vision of the future. This family event has something for
everyone, including kids. Get more information and register today.
http://sdm.link/attshape
_______________________________________________
Factor-talk mailing list
Factor-talk@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/factor-talk
