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From: =?iso-8859-2?q?S=B3awek_=AFak?= <zaks@prioris.mini.pw.edu.pl>
To: Ryan Sommers <ryans@gamersimpact.com>
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Date: Thu, 30 Sep 2004 14:05:18 +0200
In-Reply-To: <415AB9BF.1070003@gamersimpact.com> (Ryan Sommers's message of
 "Wed, 29 Sep 2004 08:33:51 -0500")
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cc: Ceri Davies <ceri@submonkey.net>
cc: freebsd-current@freebsd.org
Subject: Re: Bug in #! processing
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Ryan Sommers <ryans@gamersimpact.com> writes:

> Ceri Davies wrote:
>
>> That seems wrong too. #! shouldn't be magic anywhere other than at the
>>
>>beginning of a file.
>>
>>
> I haven't looked at the code yet, on my list, but I'm guessing this was done to
> avoid a possible circular reference.

    What circular reference? Could you elaborate? The algorithm goes like this:

    1. skip all space till #!
    2. skip #! and read path for the interpreter
    3. find and split arguments
    4. invoke intepreter with it's path at argv[0], arguments at subsequent
       positions and append path to the script at the end.

    That's it, modulo : and no interpreter path at all in the script as legacy
    which is a special case anyway.

/S