This is the mail archive of the cygwin@sourceware.cygnus.com
mailing list for the Cygwin project. See the Cygwin
home page for more information.
[Date Prev][Date Next][Thread Prev][Thread Next]
[Date Index] [Subject Index] [Author Index] [Thread Index]
Re: Cygwin B20 - fseek under gcc fails to reposition on text files
- To: earnie_boyd@yahoo.com, Peter Kabal <kabal@ece.mcgill.ca>
- Subject: Re: Cygwin B20 - fseek under gcc fails to reposition on text files
- From: Christopher Faylor <cgf@cygnus.com>
- Date: Tue, 16 Feb 1999 20:52:43 -0500
- Cc: cygwin users <cygwin@sourceware.cygnus.com>
- Delivered-To: listarch-cygwin@sourceware.cygnus.com
- Delivered-To: mailing list cygwin@sourceware.cygnus.com
- In-Reply-To: <19990216154134.3413.rocketmail@send104.yahoomail.com>; from Earnie Boyd on Tue, Feb 16, 1999 at 07:41:34AM -0800
- Mailing-List: contact cygwin-help@sourceware.cygnus.com; run by ezmlm
- References: <19990216154134.3413.rocketmail@send104.yahoomail.com>
- Sender: cygwin-owner@sourceware.cygnus.com
On Tue, Feb 16, 1999 at 07:41:34AM -0800, Earnie Boyd wrote:
>
>Ok I appoligize.
>
>Here is the "Microsoft VC++ Run-Time Library Reference" quote:
>
>For streams opened in text mode, fseek has limited use, because
>carriage return-linefeed translations can cause fseek to produce
>unexpected results. The only fseek operations guaranteed to work on
>streams opened in text mode are:
>
>* Seeking with an offset of 0 relative to any of the origin values.
>
>* Seeking from the beginning of the file with an offset value returned
>from a call to ftell.
>
>Also in text mode, CTRL+Z is interpreted as an end-of-file character
>on input. In files opened for reading/writing, fopen and all related
>routines check for a CTRL+Z at the end of the file and remove it if
>possible. This is done because using fseek and ftell to move within
>an file that ends in CTRL+Z may cause fseek to behave improperly near
>the end of the file.
>
>---
>
>Based on the documentation then I'll have to agree that your programs
>isn't behaving as the documentation states that it should. But, which
>is wrong, fseek or ftell?
>
>Sorry for speaking out of line,
This does sound like a bug. We'll try to look into this, time permitting.
If anyone else wants to take a stab at this (Corinna?) I'd be very grateful.
-chris