From: kagel AT quasar DOT bloomberg DOT com
Date: Fri, 30 Aug 1996 07:20:30 -0400
Message-Id: <9608301120.AA05499@quasar.bloomberg.com >
To: gilles_bouthenot AT mail DOT dotcom DOT fr
Cc: djgpp AT delorie DOT com
In-Reply-To: <01bb95f3$71842da0$529033c2@megar.fc-net.fr> (gilles_bouthenot@mail.dotcom.fr)
Subject: Re: struct ffblk bug in C++ ?
Reply-To: kagel AT dg1 DOT bloomberg DOT com

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   From: "Gilles Bouthenot" <gilles_bouthenot AT mail DOT dotcom DOT fr>
   Newsgroups: comp.os.msdos.djgpp
   Date: 29 Aug 1996 22:38:23 GMT
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   I wrote the next program:

   #include <dir.h>
   #include <stdio.h>
   main()
   {
	   int	s;
	   struct	ffblk dta;
	   s=findfirst("*.*",&dta,0x10);
	   while(s!=0)
	   {	printf("%s\n",dta.ff_name);
		   s=findnext(&dta);
	   }
   }

   It works perfectly when compiled in C (TEST.C)
   But when I rename it to TEST.CPP, the program doesn't work: the first two
   letters of ALL entries are missing !!
   I think that it is a bug in the declaration of the ffblk struct. Did you
   ever found this problem ?
   Thanks. DJGPP is simply great !

Check the faq.  This is a known bug in GCC, actually I think it is in cc1plus,
which we have to wait for FSF to repair.  It will probably be fixed in the next
release of DJGPP.  The problem is that the C++ compiler does not perform
structure packing properly.  You can modify the ffblk structure declaration in
dir.h as a workaround, just pack each element separately, or compile the 
function calling findfirst/findnext in "C" and call it from C++.

-- 
Art S. Kagel, kagel AT quasar DOT bloomberg DOT com

A proverb is no proverb to you 'till life has illustrated it.  -- John Keats