subject:"\[Factor\-talk\] handle\-seekable\?"

Re: [Factor-talk] handle-seekable?

2016-07-13 Thread Björn Lindqvist

This must be a bug. A stream backed by a file is seekable so 0 should
be returned as its length.

2016-07-08 1:32 GMT+02:00 John Benediktsson :
> Possibly not easy to tell at that point if it is a file or network descriptor 
> and the worst case is an additional read that returns EOF on an empty file?
>
>> On Jul 7, 2016, at 4:06 PM, Alexander Ilin  wrote:
>>
>> 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" :
>>> 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  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
>>
>> --
>> Attend Shape: An AT Tech Expo July 15-16. Meet us at AT Park in San
>> Francisco, CA to explore cutting-edge tech and listen to tech luminaries
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>
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Re: [Factor-talk] handle-seekable?

2016-07-07 Thread John Benediktsson

Possibly not easy to tell at that point if it is a file or network descriptor 
and the worst case is an additional read that returns EOF on an empty file?

> On Jul 7, 2016, at 4:06 PM, Alexander Ilin  wrote:
> 
> 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" :
>> 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  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
> 
> --
> Attend Shape: An AT Tech Expo July 15-16. Meet us at AT 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
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Re: [Factor-talk] handle-seekable?

2016-07-07 Thread Alexander Ilin

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" :
> 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  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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Re: [Factor-talk] handle-seekable?

2016-07-07 Thread Alexander Ilin

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" :
> 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  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" :
>>>  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 Tech Expo July 15-16. Meet us at AT 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 Tech Expo July 15-16. Meet us at AT 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.
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>>  https://lists.sourceforge.net/lists/listinfo/factor-talk
>
> --
> Attend Shape: An AT Tech Expo July 15-16. Meet us at AT 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.
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---=---
 Александр

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Re: [Factor-talk] handle-seekable?

2016-07-07 Thread John Benediktsson

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  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" :
>> 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 Tech Expo July 15-16. Meet us at AT 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 Tech Expo July 15-16. Meet us at AT 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.
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> ___
> Factor-talk mailing list
> Factor-talk@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/factor-talk

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Re: [Factor-talk] handle-seekable?

2016-07-07 Thread Alexander Ilin

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" :
> 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 Tech Expo July 15-16. Meet us at AT 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

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[Factor-talk] handle-seekable?

2016-07-07 Thread Alexander Ilin

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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Re: [Factor-talk] handle-seekable?

Re: [Factor-talk] handle-seekable?

Re: [Factor-talk] handle-seekable?

Re: [Factor-talk] handle-seekable?

Re: [Factor-talk] handle-seekable?

Re: [Factor-talk] handle-seekable?

[Factor-talk] handle-seekable?

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