Mail Archives: djgpp/1996/12/13/06:57:36
Message-ID: | <6MhNRh-jccB@jocokko.edition.bonbit.org>
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MIME-Version: | 1.0
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From: | kay AT edition DOT bonbit DOT org (Kay Hayen)
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Subject: | Reducing file size - again
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Date: | 12 Dec 1996 00:00:00 +0000
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Newsgroups: | comp.os.msdos.djgpp
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Distribution: | world
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Lines: | 71
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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Hallo.
So I read Section 8.15 of the FAQ 2.02, and there it says: ( reformated
a bit )
>Apart from getting to protected-mode, the DJGPP startup code also
>includes such functionality as
> - command-line argument expansion
This is explicitly NOT wishfull for my programm as I use a alternative
command line parsing lib. I currently construct a plain "char *" with
the command line to pass it.
> - long command-line support
Think my tool won't need this.
> - loading the environment from a disk file
I'm not so sure, what the enviroment would be. But as I needn't ever
make changes to such a thing, I suppose the defaults are fine for my
tool.
> - Exception handling
Needn't be that infomative for my tool. Most of the information is only
usefull for debugging.
> - FPU detection and emulator loading
Yes, my tool need's this.
>If your program doesn't need parts of the startup code, it can be made
>smaller by defining certain functions with empty bodies. These
>functions are __crt0_glob_function , __crt0_load_environment_file , and
>__crt0_setup_arguments. By defining empty substitutes for all three of
>these, you can make the "Hello" program be 18KB on disk.
I tried it out. Effects seemed like
__crt0_glob_function empty -> malloc fails allways
__crt0_load_enviroment_file -> nothing noticeable
__crt0_setup_arguments -> can't get the command line
Now the situation for my tool. It has a simple task to do, it applies
patches generated with another tool.
It does some command line parsing, but all it needed was as simple
pointer to the textual infomation. Tried some things, but I couldn't use
the __crt0_setup_arguments to intercept it somehow, for I don't know the
correct defination of it. Could somebody post it ?
Also it does some standard IO to read/write files and some screen
output.
It's memory usage depends on the patches, but I could rewrite it to use
only a bit. Are there DOS-alternatives to malloc, I could use ?
Maybe one could give a URL to the crt0 source ? This would sure help a
lot too.
Mls, Kay
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