Date: Fri, 25 Feb 1994 12:49:40 +0100
To: djgpp AT sun DOT soe DOT clarkson DOT edu
From: ahelm AT email DOT tuwien DOT ac DOT at (Anton Helm)
Subject: fopen() problem

Hi !

I run into troubles with fopen() when I try to append to a textfile.

1) There are 2 different kinds of textfiles:
  a) Textfiles WITH EOF character ( ^Z, 0x1A).
  b) Textfiles WITHOUT EOF character.
  Dont ask me why, that is MS-DOS...

2) If I use type b) files -> anything is fine.
   If I try to use fopen(filename, "a") on a type a) file 
   fprintf() or any other of the output functions will write
   BEHIND the EOF character. When opening such a file with an 
   editor (or any DOS-command) it will detect the EOF and the text 
   behind (which is actually there) cannot be accessed.

3) Workaround:

   f = fopen(filename, "a"); 
   fseek(f, -1, 1);
   if(fgetc(f) == EOF)
     fseek(f, -1, 1);

   This would deal with both kinds of textfiles.


Is that a feature or a bug ?


Maybe it has been discussed before, but I have been removed from the list 
several times (see below).


Tony


BTW:
I detected this morning, that I have been removed from the mailing list again.
It was the 3rd time since 1/1/94. 

To all who dont believe:
1) I got no message that I have been removed.
2) there were no messages from this list for 5 days.
3) detection method:
   I sent a delete message to listserv TODAY and got the following reply:

>> Per your request
>>	 "delete ahelm AT email DOT tuwien DOT ac DOT at djgpp"
>> 'ahelm AT email DOT tuwien DOT ac DOT at' was NOT FOUND on the 'djgpp' mailing list.






============================================================================
Office:                           **    Private:
                                  **
Dipl.-Ing. Anton HELM             **
Institut fuer Nachrichtentechnik  **    
und Hochfrequenztechnik           **    Anton HELM
Guszhausstr. 25/389               **    Gratian-Marx Str. 7/27
A-1040 Wien                       **    A-1110 Wien
AUSTRIA                           **    AUSTRIA  
                                  **
Tel.: +43-1-58801-3520            **
FAX : +43-1-5870583               **
                                  **
============================================================================
   ________   __    __           __        __   __   _______   __        __
  /__   __/  / /   / /          / /       / /  / /  / _____/  /  \      / /
    /  /    / /   / /  _____   / /  __   / /  / /  / /____   / /\ \    / /
   /  /    / /   / /  /____/  / /  / /  / /  / /  / _____/  / /  \ \  / /
  /  /    / /___/ /          / /__/ /__/ /  / /  / /____   / /    \ \/ /
 /__/    /_______/          /___________/  /_/  /______/  /_/      \__/

============================================================================