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?
---=====---
Александр
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