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Christopher Browne  
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 More options Jun 23 2000, 3:00 am
Newsgroups: comp.lang.lisp
From: cbbro...@news.hex.net (Christopher Browne)
Date: 2000/06/23
Subject: Re: Newbie asking for help
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Centuries ago, Nostradamus foresaw a time when Jochen Schmidt would say:

>The Glauber wrote:
>> ;; count number of lines in file key.html
>> (with-open-file (ifile "key.html" :direction :input)
>>                 (setf nlines 0)
>>                 (loop
>>                   (if (read-line ifile nil)
>>                     (setf nlines (+ 1 nlines))
>>                     (return nlines))))

>> It doesn't work (it just hangs, so i think it's stuck in the loop). I
>> thought it would read lines until the end of the file, when the read-
>> line would return nil, and that would trigger the second form inside
>> the if (a return, to get out of the loop).

>> I'm sorry for posting something so stupid, but why doesn't this work?

>It works for me in cmucl (warning on the nondefined variable "nlines")
>It works in Allegro Trial Edition 5.0.1 for Linux (without warnings)
>It works in Lispworks Personal Edition 4.1.18 (without warnings)
>But it seems NOT to work with clisp !!! (as the former author noted, it
>blocks)

>have not looked further into it, but I found this interesting enough to
>post it.

It indeed sounds like a CLISP bug; the HyperSpec indicates that for:
read-line &optional input-stream eof-error-p eof-value recursive-p

the default value for eof-value is nil, which I'd expect to provide
the desired result.

The code's a bit ugly, but I'd sure expect the call to return "nil"
without much ado...
--
cbbro...@ntlug.org - <http://www.ntlug.org/~cbbrowne/lsf.html>
"Consistency  is  the  single  most important  aspect  of  *ideology.*
Reality is not nearly so consistent." - <cbbro...@hex.net>


 
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