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From: brian@awfulhak.demon.co.uk (Brian Somers)
Newsgroups: comp.unix.bsd.misc,alt.unix.wizards,comp.unix.misc
Subject: Re: How to write end of file character into file??!
Followup-To: comp.unix.bsd.misc,alt.unix.wizards,comp.unix.misc
Date: 16 Apr 1996 01:13:36 +0100
Organization: Coverform Ltd.
Lines: 58
Message-ID: <4kuonh$q2@anorak.coverform.lan>
References: <xsvarshney-0604962038290001@newshub.csu.net> <4kb6sv$399@is05.micron.net> <4khh63$a3@anorak.coverform.lan> <4ktvmc$5d6@is05.micron.net>
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Xref: euryale.cc.adfa.oz.au comp.unix.bsd.misc:729 alt.unix.wizards:3646 comp.unix.misc:22006
Dwight Tovey (dwight@micron.net) wrote:
: In article <4khh63$a3@anorak.coverform.lan>, brian@awfulhak.demon.co.uk (Brian Somers) writes:
: |> Dwight Tovey (dwight@micron.net) wrote:
: |> [stuff deleted]
: |>
: |> : data_f = fopen( "input", "r" );
: |> : while( !feof( data_f )) {
: |> : fread(....)
: |> : .....
: |> : }
: |>
: |> : fclose( data_f );
: |>
: |> Nope, you'd be better off writing
: |>
: |> data_f = fopen( "input", "r" );
: |> while( fread(....), !feof( data_f ) ) {
: |> .....
: |> }
: |>
: |> fclose( data_f )
: |>
: |> And don't ever call me pedantic ! :-)
: |>
: Not only are you pedantic, you are wrong. :)
: With what you have, you won't process the last block of data if it is
: smaller than the size of the read request.
: The code I had wasn't complete either, but my intent was only to bring
: attention to the feof macro.
: /dwight
: --
: Dwight N. Tovey H&W Computer Systems, Inc.
: Software Specialist III 12438 W. Bridger St. Suite 100
: dwight@hwcs.com Boise, ID. 83713
: or dwight@micron.net (208)377-0336
: I didn't claw my way to the top of the food chain to eat vegetables!!
:
Of course you're correct ! But retrospectively, I now believe that the
original poster was getting at this sort of code:
int ch;
if( fp = fopen( ... ), !fp )
...
while( ch = fgetc( fp ), ch != EOF )
...
fclose( fp );
The mistake that you can make here is thinking that EOF is a character.
EOF has however a value outside a 'char' range, and is thus a status.
--
Brian <brian@awfulhak.demon.co.uk>
Don't _EVER_ lose your sense of humour....