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Re: fread a file of unknown size

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Keith Thompson <kst-u@mib.org> wrote:

(snip, I wrote)
>> Yes, but does the C standard allow for a file to reach EOF, and then,
>> on the next read, not be at EOF?
 
> I don't think so, but fseek() clears the end-of-file indicator.
 
>> I did once (OS/2 1.0 days) port gnu tail to OS/2, and it did work.
>> I didn't try very hard to figure out how it worked, just that it did.
 
> I think tail (specifically `tail -f`) uses fseek(file, 0, SEEK_CUR).

Okay, I was going to say that once fread() returned zero it would
keep doing that, but then I remembered tail.  But then it was about 25
years ago that I was looking at tail.  I did remember wondering if
it would work the same way.

The biggest problem I remember with gnu utilities is that they would
use 0 as an argument to a function expecting (char *). When I complained
to the gnu people, they had some comment about systems having different
sized (int) and (char*) not being supported.

-- glen

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Thread

fread a file of unknown size ruben safir <ruben@mrbrklyn.com> - 2015-03-08 14:47 -0400
  Re: fread a file of unknown size Richard Heathfield <rjh@cpax.org.uk> - 2015-03-08 18:59 +0000
    Re: fread a file of unknown size James Kuyper <jameskuyper@verizon.net> - 2015-03-08 18:21 -0400
      Re: fread a file of unknown size Keith Thompson <kst-u@mib.org> - 2015-03-08 18:43 -0700
    Re: fread a file of unknown size fmassei@gmail.com - 2015-03-08 15:41 -0700
      Re: fread a file of unknown size raltbos@xs4all.nl (Richard Bos) - 2015-03-10 16:04 +0000
    Re: fread a file of unknown size Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-03-08 18:44 -0400
  Re: fread a file of unknown size jacob navia <jacob@spamsink.net> - 2015-03-08 20:32 +0100
  Re: fread a file of unknown size Keith Thompson <kst-u@mib.org> - 2015-03-08 12:48 -0700
  Re: fread a file of unknown size glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-03-08 23:39 +0000
    Re: fread a file of unknown size James Kuyper <jameskuyper@verizon.net> - 2015-03-08 20:40 -0400
      Re: fread a file of unknown size glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-03-09 01:24 +0000
        Re: fread a file of unknown size Keith Thompson <kst-u@mib.org> - 2015-03-09 07:53 -0700
          Re: fread a file of unknown size glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-03-09 17:36 +0000
            Re: fread a file of unknown size Keith Thompson <kst-u@mib.org> - 2015-03-09 10:44 -0700
              Re: fread a file of unknown size glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-03-09 20:07 +0000

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