Subject: Re: CVS commit: basesrc/usr.bin/file
To: None <firstname.lastname@example.org>
From: der Mouse <mouse@Rodents.Montreal.QC.CA>
Date: 06/05/2002 10:51:47
>>> So, it most be solved in another way, probably by padding struct
>>> file in such a way that it's the same on all archs.
["struct magic", surely?]
>> That's only a better-guess "solution" (ie, it works on more hosts
>> but still is not C-guaranteed to work). If you really want to
>> generate the same data on all arches, you have to pack and unpack it
>> yourself, rather than depending on overlaying a struct onto it.
> The object of the magic.mgc is so that you don't have to interpret
> the uncompiled file each time around.
(a) Unpacking a binary file carefully is usually still faster than
parsing and compiling the text file.
(b) The compiled file *reader* is a NetBSD-only program, I think? Only
the *writer* is liable to be compiled with non-gcc? In that case,
the writer should be super-careful, but the reader can overlay a
struct and count on gcc to make it work "right".
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