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X-Admin: news AT aol DOT com
From: sterten AT aol DOT com (Sterten)
Newsgroups: comp.os.msdos.djgpp
Date: 08 Feb 2004 06:24:43 GMT
References: <200402071458 DOT i17EwZtr013586 AT envy DOT delorie DOT com>
Organization: AOL Bertelsmann Online GmbH & Co. KG http://www.germany.aol.com
Subject: Re: attaching source code to the ececutable
Message-ID: <20040208012443.22711.00001133@mb-m19.aol.com>
To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

 >> no, it's for the potential user or email-friend who has got the .exe
 >> from you and now wants to see its sourcecode.
 >
 >So include a command line option to print the includes source.

are you saying, the source is included in the .exe by default ?
Well, then it must be somehow encrypted since I can't find it.
Hmm, I could also put the source itself into a string
and add it to the source before compiling it.

 >> I have many programs with text attached and never observed any
 >> problems.
 >
 >DJGPP programs?

I think, yes. Although I'm not sure how exactly DJGPP programs
are defined. I found the string
"DJGPP libc built Dec 24 2001 21:24:39 by GCC 2.8.1"
in my program.

 >> I assume that the attached text isn't loaded, when the program is
 >> executed. DOS/Windows looks for the length of the program in the
 >> .exe header and then only loads to RAM the number of bytes specified
 >> there, and ignores the rest.
 >
 >Right, that's 2048 bytes for all djgpp programs.

to be sure that I understand this correctly :
The exe-header of the executables always specify a length of 2048 bytes,
and only 2048 bytes of the program are loaded to RAM and then
eventually later the .exe-file is opened again and additional
code is loaded ? So, e.g. can I switch directories from within
a DJGPP program or delete/rename/move/open the executable itself ?

 >> So there can only be problems, if the program opens the .exe files
 >> itself, (like my sourcecode-printing routine does) e.g. for
 >> computing a checksum.
 >
 >It does.  That's how ALL djgpp programs work.  DJGPP programs are
 >*already* a program with data attached to it.  So, you can't do what
 >you want with DJGPP.

like attaching additional data ?


BTW. here is my batch file which I use for compiling:

rem  this is the file gc.bat which I use to compile .c programs
set djgpp=c:\djgpp\djgpp.env
set path=c:\djgpp\bin;%path%
gcc %1.c -O2 -o %1.exe
strip %1.exe
echo ----------------------------------------- >>%1.exe
echo ----------------------------------------- >>%1.exe
echo ----------------------------------------- >>%1.exe
type %1.c >>%1.exe


Guenter.