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From: wirzeniu@klaava.Helsinki.FI (Lars Wirzenius)
Newsgroups: comp.lang.c
Subject: Re: How to FSEEK previous line of text?
Message-ID: <1991May11.162353.683@klaava.Helsinki.FI>
Date: 11 May 91 16:23:53 GMT
References: <4508.28269613@iccgcc.decnet.ab.com> <1991May11.063436.18318@swsrv1.cirr.com>
Sender: news@klaava.Helsinki.FI (Uutis Ankka)
Organization: University of Helsinki
Lines: 11

In article <1991May11.063436.18318@swsrv1.cirr.com> toma@swsrv1.cirr.com (Tom Armistead) writes:
>In a text file, you can generally assume that the lines will have a max length
>of BUFSIZ.  So, you could seek backward BUFSIZ*2 bytes, read the number of

Unless I'm very much mistaken, as far as text streams are concerned, you
can't portably hand fseek any other values than 0 and those earlier
returned by ftell. You can't do 'fseek(f, -BUFSIZ, SEEK_CUR)', since the
values returned by ftell are not guaranteed to be simple byte offsets
(such offsets don't work very well for text files in all environments).
-- 
Lars Wirzenius  wirzenius@cc.helsinki.fi