Have a second look at my previous post. I did get 14 and 16 with the hex editor.

None of PerlIO, clib and the OS know anything of __DATA__, so they don't reporting the file positions different after the first __DATA__ is encountered.

Special Literals

Text after __DATA__ may be read via the filehandle PACKNAME::DATA , where PACKNAME is the package that was current when the __DATA__ token was encountered. The filehandle is left open pointing to the contents after __DATA__. It is the program's responsibility to close DATA when it is done reading from it.

Correct me if I'm wrong but the way I understand it is Perl has to compile and preprocess the program file. It reads the file until EOF or __END__ or __DATA__. According to the above section DATA is left open pointing to just after __DATA__. That means when you do a "tell DATA" like I did at the beginning of the script there is nothing for tell() to calculate: It just has to spit out the file location. Then, after reading from DATA if you do another tell DATA it has to do the math.

I just ran the script on Knoppix linux and this problem didn't show up. The seek went to the correct location and there were no partial lines printed.

I'm sorry that I couldn't explain about the offsets better. I know what I meant and it makes sense to me. I thought it was an interesting problem that others would be interested in or I wouldn't have posted it.

I've had a splitting headache all day and now that I've had some Tylenol and a snack I'm off to relax a little.

In reply to Re^6: Unexpected result using tell/seek within the __DATA__ file by Gulliver
in thread Unexpected result using tell/seek within the __DATA__ file by Gulliver

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.