[Rd] (PR#1287) seek was ignoring the `origin' argument (was

[ripley@stats.ox.ac.uk]

The original subject line is false.  It *does* reposition, but `origin'
was being ignored, so your request was to reposition to the beginning of
the file, and that is what happened.

This was already fixed in R-patched: from NEWS there:

    o	seek() on file connections was ignoring the `origin' argument.

It's always worth looking at the current patched version.


On Tue, 29 Jan 2002 garbade@psy.uni-muenchen.de wrote:

> Full_Name: Sven Garbade
> Version: 1.4.0
> OS: Linux i386
> Submission from: (NULL) (129.187.254.49)
>
>
> It seems that seek() can't reposition a file connection, but it can report the
> actual file position correctly if the file connection was repositioned by
> another function (e.g. readBin()).
>
> R code:
>
> > s <- file("p9_os/p9lr_all.mea","rb")
> > s
>          description                class                 mode
> "p9_os/p9lr_all.mea"               "file"                 "rb"
>                 text               opened             can read
>             "binary"             "opened"                "yes"
>            can write
>                 "no"
> > seek(s, 0, "end")
> [1] 0
> > seek(s)
> [1] 0           # file connctor its still at the first position
> > readBin(s, integer(), 64, size=2)
>  [1]   103     1   400     1   749     0     0     0     0     0     0     0
> [13]     0     0     0     0     0     0     0     0     0     0     0     0
> [25]     0     0     0     0     0     0     0     0 11884 25888 25977 11552
> [37] 22560     0     0     0     0     0     0     0     0     0     0     0
> [49]     0     0     0     0     0     0     0     0     0     0     0     0
> [61]     0     0     0     0
> > seek(s)
> [1] 128        # here seek reports the correct postion
>
>
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-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


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