[Info-vax] Re; Spiralog, RMS Journaling (was Re: FREESPADRIFT)

[Johnny Billquist]

On 2016-06-29 10:48, Johnny Billquist wrote:
> On 2016-06-28 15:02, Bob Koehler wrote:
>> In article <nks2in$3gn$1 at Iltempo.Update.UU.SE>, Johnny Billquist
>> <bqt at softjar.se> writes:
>>>
>>> No it is not the number of bytes written in the file. As noted before,
>>> the number of bytes written in the file can either be 1) The actual
>>> number of bytes written in the file, which should then exclude padding
>>> bytes at record ends, and padding bytes at block ends, or 2) the number
>>> of bytes constituting the blocks written, since in the end, all writes
>>> are in blocks.
>>
>>    If I write "hellow world\n" on UNIX, I get a different number of
>>    bytes in the file than if I write it on Windows, even though my
>>    application wrote the same thing.
>>
>>    So which one is the "number of bytes" _written_ "to the file"?
>
> Since the OSes are different, the number of bytes written are different.
> Why do you expect that you will get the same number of bytes written in
> both cases?
> However, reading the file with the proper low level functions (ie not
> the C stdio format library functions fgets(), which do some even funkier
> stuff when reading), you would get the same number of bytes read back as
> was original written to the file, and that would be the same number of
> bytes as reported by the stat() call. I would suggest reading with
> something like fgetc() or fread() if you are more impatient.
>
> Very consistent, and very correct. In VMS it's neither. (Well, it is
> consistently wrong, which I guess is consistent... :-) )
>
> Put it in very simple terms. If I have a file, and I do a stat() call,
> to find out how many bytes there are in the file, I should be able to
> call fgetc() that many times to get all the bytes in the file. Anything
> breaking this assumption means the reported size is wrong.

And before anyone comes with a silly argument like having stat() return 
+inf: reading one byte more than what stat() returned as the size, 
should return an error.

	Johnny