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

   Errors-To: postmaster AT ns1
   Xref: news2.mv.net comp.os.msdos.djgpp:8045
   From: "Gilles Bouthenot" <gilles_bouthenot AT mail DOT dotcom DOT fr>
   Newsgroups: comp.os.msdos.djgpp
   Date: 29 Aug 1996 22:38:23 GMT
   Organization: C.I.A.
   Lines: 21
   Nntp-Posting-Host: ppp82.fc-net.fr
   X-Newsreader: Microsoft Internet News 4.70.1155
   Dj-Gateway: from newsgroup comp.os.msdos.djgpp
   Content-Type: text
   Content-Length: 490

   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

- Raw text -