Date: Sun, 19 May 2002 22:31:55 -0700 From: Peter Wemm <peter@wemm.org> To: Jonathan Mini <mini@FreeBSD.ORG> Cc: "E.B. Dreger" <eddy+public+spam@noc.everquick.net>, freebsd-hackers@FreeBSD.ORG Subject: Re: any file --> symbol in .o file Message-ID: <20020520053155.5B2FD39FC@overcee.wemm.org> In-Reply-To: <20020519214105.K25907@stylus.haikugeek.com>
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Jonathan Mini wrote:
> Take a look at file2c. You'll need to run the source through the compiler
> first, but that is easy to do with make.
You probably also want to look at objcopy. You can skip the compile step
if you're prepared to use a bit of linker magic:
peter@overcee[10:28pm]/tmp-192> cat p.c
extern char __start_buf[]; /* magic */
extern char __stop_buf[]; /* more magic */
main()
{
printf("%.100s\n", __start_buf);
}
peter@overcee[10:28pm]/tmp-193> cc -c p.c
peter@overcee[10:28pm]/tmp-194> objcopy --add-section buf=/etc/termcap \
--set-section-flags buf=load,alloc p.o p2.o
peter@overcee[10:28pm]/tmp-195> cc -o p2 p2.o
peter@overcee[10:29pm]/tmp-196> ./p2
# Copyright (c) 1980, 1985, 1989, 1993
# The Regents of the University of California. All rights re
The trick is that __start_[sectionname] and __stop_[sectionname] are magic.
The other trick is that you have to set the flags to load,alloc or you will
be somewhat disappointed.
Bear in mind that the sections are verbatim, ie: not null terminated. You
would have to do address arithmetic on the delimiter symbols to get the
size.
> E.B. Dreger [eddy+public+spam@noc.everquick.net] wrote :
>
> > Greetings all,
> >
> >
> > While writing CGIs in C, I'm getting a bit sick of escaping
> > quotes and line continuations in strings. Not a huge deal,
> > perhaps, but there must be a better way. Strings end up in .data
> > or .rodata in object files to be linked...
> >
> > I'm about to whip up a utility that will take any arbitrary
> > file and store the contents in a .o file (complete with symbol
> > names so one can actually link, of course).
> >
> > Instead of compiling:
> >
> > const char foo[] = "\"Escape\" chars make strings in 'C'
> > code...\n\
> > ...messy. Line breaks can be troublesome and add\
> > unexpected whitespace to one's code." ;
> >
> > simply put the desired unescaped text in a file:
> >
> > "Escape" chars make strings in 'C' code...
> > ...messy. Line breaks can be troublesome and add
> > unexpected whitespace to one's code.
> >
> > then run the utility.
> >
> > Large amounts of embedded HTML/XML/XHTML are just beginning to
> > bug me.
> >
> > Note that it wouldn't be limited to text, either. If one wished
> > to take a raw-binary lookup table for a sine wave, that would
> > make no difference.
> >
> > If there's interest, I'll post it for download. I also have a
> > few other ideas, and certainly am open to suggestions.
> >
> >
> > --
> > Eddy
> >
> > Brotsman & Dreger, Inc. - EverQuick Internet Division
> > Phone: +1 (316) 794-8922 Wichita/(Inter)national
> > Phone: +1 (785) 865-5885 Lawrence
> >
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Date: Mon, 21 May 2001 11:23:58 +0000 (GMT)
> > From: A Trap <blacklist@brics.com>
> > To: blacklist@brics.com
> > Subject: Please ignore this portion of my mail signature.
> >
> > These last few lines are a trap for address-harvesting spambots.
> > Do NOT send mail to <blacklist@brics.com>, or you are likely to
> > be blocked.
> >
> >
> > To Unsubscribe: send mail to majordomo@FreeBSD.org
> > with "unsubscribe freebsd-hackers" in the body of the message
>
> --
> Jonathan Mini <mini@freebsd.org>
> http://www.haikugeek.com
>
> "He who is not aware of his ignorance will be only misled by his knowledge."
> -- Richard Whatley
>
> To Unsubscribe: send mail to majordomo@FreeBSD.org
> with "unsubscribe freebsd-hackers" in the body of the message
>
Cheers,
-Peter
--
Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com
"All of this is for nothing if we don't go to the stars" - JMS/B5
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